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Merge commit 'a120e3f70101ebe90f92fe59436a37e6caf42adf' as 'deps/glfw'

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Gary Talent
2022-03-11 22:04:50 -06:00
parent 6885aca0e8 a120e3f701
commit 3e080b95d5
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# NOTE: The order of this list determines the order of items in the Guides
# (i.e. Pages) list in the generated documentation
set(GLFW_DOXYGEN_SOURCES
"include/GLFW/glfw3.h"
"include/GLFW/glfw3native.h"
"docs/main.dox"
"docs/news.dox"
"docs/quick.dox"
"docs/moving.dox"
"docs/compile.dox"
"docs/build.dox"
"docs/intro.dox"
"docs/context.dox"
"docs/monitor.dox"
"docs/window.dox"
"docs/input.dox"
"docs/vulkan.dox"
"docs/compat.dox"
"docs/internal.dox")
# Format the source list into a Doxyfile INPUT value that Doxygen can parse
foreach(path IN LISTS GLFW_DOXYGEN_SOURCES)
set(GLFW_DOXYGEN_INPUT "${GLFW_DOXYGEN_INPUT} \\\n\"${GLFW_SOURCE_DIR}/${path}\"")
endforeach()
configure_file(Doxyfile.in Doxyfile @ONLY)
add_custom_target(docs ALL "${DOXYGEN_EXECUTABLE}"
WORKING_DIRECTORY "${GLFW_BINARY_DIR}/docs"
COMMENT "Generating HTML documentation" VERBATIM)
set_target_properties(docs PROPERTIES FOLDER "GLFW3")

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* @elmindreda
src/wl_* @linkmauve
docs/*.css @glfw/webdev
docs/*.scss @glfw/webdev
docs/*.html @glfw/webdev
docs/*.xml @glfw/webdev

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# Contribution Guide
## Contents
- [Asking a question](#asking-a-question)
- [Reporting a bug](#reporting-a-bug)
- [Reporting a compile or link bug](#reporting-a-compile-or-link-bug)
- [Reporting a segfault or other crash bug](#reporting-a-segfault-or-other-crash-bug)
- [Reporting a context creation bug](#reporting-a-context-creation-bug)
- [Reporting a monitor or video mode bug](#reporting-a-monitor-or-video-mode-bug)
- [Reporting a window, input or event bug](#reporting-a-window-input-or-event-bug)
- [Reporting some other library bug](#reporting-some-other-library-bug)
- [Reporting a documentation bug](#reporting-a-documentation-bug)
- [Reporting a website bug](#reporting-a-website-bug)
- [Requesting a feature](#requesting-a-feature)
- [Contributing a bug fix](#contributing-a-bug-fix)
- [Contributing a feature](#contributing-a-feature)
## Asking a question
Questions about how to use GLFW should be asked either in the [support
section](https://discourse.glfw.org/c/support) of the forum, under the [Stack
Overflow tag](https://stackoverflow.com/questions/tagged/glfw) or [Game
Development tag](https://gamedev.stackexchange.com/questions/tagged/glfw) on
Stack Exchange or in the IRC channel `#glfw` on
[Libera.Chat](https://libera.chat/).
Questions about the design or implementation of GLFW or about future plans
should be asked in the [dev section](https://discourse.glfw.org/c/dev) of the
forum or in the IRC channel. Please don't open a GitHub issue to discuss design
questions without first checking with a maintainer.
## Reporting a bug
If GLFW is behaving unexpectedly at run-time, start by setting an [error
callback](https://www.glfw.org/docs/latest/intro_guide.html#error_handling).
GLFW will often tell you the cause of an error via this callback. If it
doesn't, that might be a separate bug.
If GLFW is crashing or triggering asserts, make sure that all your object
handles and other pointers are valid.
For bugs where it makes sense, a short, self contained example is absolutely
invaluable. Just put it inline in the body text. Note that if the bug is
reproducible with one of the test programs that come with GLFW, just mention
that instead.
__Don't worry about adding too much information__. Unimportant information can
be abbreviated or removed later, but missing information can stall bug fixing,
especially when your schedule doesn't align with that of the maintainer.
__Please provide text as text, not as images__. This includes code, error
messages and any other text. Text in images cannot be found by other users
searching for the same problem and may have to be re-typed by maintainers when
debugging.
You don't need to manually indent your code or other text to quote it with
GitHub Markdown; just surround it with triple backticks:
```
Some quoted text.
```
You can also add syntax highlighting by appending the common file extension:
```c
int five(void)
{
return 5;
}
```
There are issue labels for both platforms and GPU manufacturers, so there is no
need to mention these in the subject line. If you do, it will be removed when
the issue is labeled.
If your bug is already reported, please add any new information you have, or if
it already has everything, give it a :+1:.
### Reporting a compile or link bug
__Note:__ GLFW needs many system APIs to do its job, which on some platforms
means linking to many system libraries. If you are using GLFW as a static
library, that means your application needs to link to these in addition to GLFW.
__Note:__ Check the [Compiling
GLFW](https://www.glfw.org/docs/latest/compile.html) guide and or [Building
applications](https://www.glfw.org/docs/latest/build.html) guide for before
opening an issue of this kind. Most issues are caused by a missing package or
linker flag.
Always include the __operating system name and version__ (e.g. `Windows
7 64-bit` or `Ubuntu 15.10`) and the __compiler name and version__ (e.g. `Visual
C++ 2015 Update 2`). If you are using an official release of GLFW,
include the __GLFW release version__ (e.g. `3.1.2`), otherwise include the
__GLFW commit ID__ (e.g. `3795d78b14ef06008889cc422a1fb8d642597751`) from Git.
Please also include the __complete build log__ from your compiler and linker,
even if it's long. It can always be shortened later, if necessary.
#### Quick template
```
OS and version:
Compiler version:
Release or commit:
Build log:
```
### Reporting a segfault or other crash bug
Always include the __operating system name and version__ (e.g. `Windows
7 64-bit` or `Ubuntu 15.10`). If you are using an official release of GLFW,
include the __GLFW release version__ (e.g. `3.1.2`), otherwise include the
__GLFW commit ID__ (e.g. `3795d78b14ef06008889cc422a1fb8d642597751`) from Git.
Please also include any __error messages__ provided to your application via the
[error
callback](https://www.glfw.org/docs/latest/intro_guide.html#error_handling) and
the __full call stack__ of the crash, or if the crash does not occur in debug
mode, mention that instead.
#### Quick template
```
OS and version:
Release or commit:
Error messages:
Call stack:
```
### Reporting a context creation bug
__Note:__ Windows ships with graphics drivers that do not support OpenGL. If
GLFW says that your machine lacks support for OpenGL, it very likely does.
Install drivers from the computer manufacturer or graphics card manufacturer
([Nvidia](https://www.geforce.com/drivers),
[AMD](https://www.amd.com/en/support),
[Intel](https://www-ssl.intel.com/content/www/us/en/support/detect.html)) to
fix this.
__Note:__ AMD only supports OpenGL ES on Windows via EGL. See the
[GLFW\_CONTEXT\_CREATION\_API](https://www.glfw.org/docs/latest/window_guide.html#window_hints_ctx)
hint for how to select EGL.
Please verify that context creation also fails with the `glfwinfo` tool before
reporting it as a bug. This tool is included in the GLFW source tree as
`tests/glfwinfo.c` and is built along with the library. It has switches for all
GLFW context and framebuffer hints. Run `glfwinfo -h` for a complete list.
Always include the __operating system name and version__ (e.g. `Windows
7 64-bit` or `Ubuntu 15.10`). If you are using an official release of GLFW,
include the __GLFW release version__ (e.g. `3.1.2`), otherwise include the
__GLFW commit ID__ (e.g. `3795d78b14ef06008889cc422a1fb8d642597751`) from Git.
If you are running your program in a virtual machine, please mention this and
include the __VM name and version__ (e.g. `VirtualBox 5.1`).
Please also include the __GLFW version string__ (`3.2.0 X11 EGL clock_gettime
/dev/js`), as described
[here](https://www.glfw.org/docs/latest/intro.html#intro_version_string), the
__GPU model and driver version__ (e.g. `GeForce GTX660 with 352.79`), and the
__output of `glfwinfo`__ (with switches matching any hints you set in your
code) when reporting this kind of bug. If this tool doesn't run on the machine,
mention that instead.
#### Quick template
```
OS and version:
GPU and driver:
Release or commit:
Version string:
glfwinfo output:
```
### Reporting a monitor or video mode bug
__Note:__ On headless systems on some platforms, no monitors are reported. This
causes glfwGetPrimaryMonitor to return `NULL`, which not all applications are
prepared for.
__Note:__ Some third-party tools report more video modes than are approved of
by the OS. For safety and compatibility, GLFW only reports video modes the OS
wants programs to use. This is not a bug.
The `monitors` tool is included in the GLFW source tree as `tests/monitors.c`
and is built along with the library. It lists all information GLFW provides
about monitors it detects.
Always include the __operating system name and version__ (e.g. `Windows
7 64-bit` or `Ubuntu 15.10`). If you are using an official release of GLFW,
include the __GLFW release version__ (e.g. `3.1.2`), otherwise include the
__GLFW commit ID__ (e.g. `3795d78b14ef06008889cc422a1fb8d642597751`) from Git.
If you are running your program in a virtual machine, please mention this and
include the __VM name and version__ (e.g. `VirtualBox 5.1`).
Please also include any __error messages__ provided to your application via the
[error
callback](https://www.glfw.org/docs/latest/intro_guide.html#error_handling) and
the __output of `monitors`__ when reporting this kind of bug. If this tool
doesn't run on the machine, mention this instead.
#### Quick template
```
OS and version:
Release or commit:
Error messages:
monitors output:
```
### Reporting a window, input or event bug
__Note:__ The exact ordering of related window events will sometimes differ.
__Note:__ Window moving and resizing (by the user) will block the main thread on
some platforms. This is not a bug. Set a [refresh
callback](https://www.glfw.org/docs/latest/window.html#window_refresh) if you
want to keep the window contents updated during a move or size operation.
The `events` tool is included in the GLFW source tree as `tests/events.c` and is
built along with the library. It prints all information provided to every
callback supported by GLFW as events occur. Each event is listed with the time
and a unique number to make discussions about event logs easier. The tool has
command-line options for creating multiple windows and full screen windows.
Always include the __operating system name and version__ (e.g. `Windows
7 64-bit` or `Ubuntu 15.10`). If you are using an official release of GLFW,
include the __GLFW release version__ (e.g. `3.1.2`), otherwise include the
__GLFW commit ID__ (e.g. `3795d78b14ef06008889cc422a1fb8d642597751`) from Git.
If you are running your program in a virtual machine, please mention this and
include the __VM name and version__ (e.g. `VirtualBox 5.1`).
Please also include any __error messages__ provided to your application via the
[error
callback](https://www.glfw.org/docs/latest/intro_guide.html#error_handling) and
if relevant, the __output of `events`__ when reporting this kind of bug. If
this tool doesn't run on the machine, mention this instead.
__X11:__ If possible, please include what desktop environment (e.g. GNOME,
Unity, KDE) and/or window manager (e.g. Openbox, dwm, Window Maker) you are
running. If the bug is related to keyboard input, please include any input
method (e.g. ibus, SCIM) you are using.
#### Quick template
```
OS and version:
Release or commit:
Error messages:
events output:
```
### Reporting some other library bug
Always include the __operating system name and version__ (e.g. `Windows
7 64-bit` or `Ubuntu 15.10`). If you are using an official release of GLFW,
include the __GLFW release version__ (e.g. `3.1.2`), otherwise include the
__GLFW commit ID__ (e.g. `3795d78b14ef06008889cc422a1fb8d642597751`) from Git.
Please also include any __error messages__ provided to your application via the
[error
callback](https://www.glfw.org/docs/latest/intro_guide.html#error_handling), if
relevant.
#### Quick template
```
OS and version:
Release or commit:
Error messages:
```
### Reporting a documentation bug
If you found a bug in the documentation, including this file, then it's fine to
just link to that web page or mention that source file. You don't need to match
the source to the output or vice versa.
### Reporting a website bug
If the bug is in the documentation (anything under `/docs/`) then please see the
section above. Bugs in the rest of the site are reported to the [website
source repository](https://github.com/glfw/website/issues).
## Requesting a feature
Please explain why you need the feature and how you intend to use it. If you
have a specific API design in mind, please add that as well. If you have or are
planning to write code for the feature, see the section below.
If there already is a request for the feature you need, add your specific use
case unless it is already mentioned. If it is, give it a :+1:.
## Contributing a bug fix
__Note:__ You must have all necessary [intellectual
property rights](https://en.wikipedia.org/wiki/Intellectual_property) to any
code you contribute. If you did not write the code yourself, you must explain
where it came from and under what license you received it. Even code using the
same license as GLFW may not be copied without attribution.
__There is no preferred patch size__. A one character fix is just as welcome as
a thousand line one, if that is the appropriate size for the fix.
In addition to the code, a complete bug fix includes:
- Change log entry in `README.md`, describing the incorrect behavior
- Credits entries for all authors of the bug fix
Bug fixes will not be rejected because they don't include all the above parts,
but please keep in mind that maintainer time is finite and that there are many
other bugs and features to work on.
If the patch fixes a bug introduced after the last release, it should not get
a change log entry.
If you haven't already, read the excellent article [How to Write a Git Commit
Message](https://chris.beams.io/posts/git-commit/).
## Contributing a feature
__Note:__ You must have all necessary rights to any code you contribute. If you
did not write the code yourself, you must explain where it came from and under
what license. Even code using the same license as GLFW may not be copied
without attribution.
__Note:__ If you haven't already implemented the feature, check first if there
already is an open issue for it and if it's already being developed in an
[experimental branch](https://github.com/glfw/glfw/branches/all).
__There is no preferred patch size__. A one character change is just as welcome
as one adding a thousand line one, if that is the appropriate size for the
feature.
In addition to the code, a complete feature includes:
- Change log entry in `README.md`, listing all new symbols
- News page entry, briefly describing the feature
- Guide documentation, with minimal examples, in the relevant guide
- Reference documentation, with all applicable tags
- Cross-references and mentions in appropriate places
- Credits entries for all authors of the feature
If the feature requires platform-specific code, at minimum stubs must be added
for the new platform function to all supported and experimental platforms.
If it adds a new callback, support for it must be added to `tests/event.c`.
If it adds a new monitor property, support for it must be added to
`tests/monitor.c`.
If it adds a new OpenGL, OpenGL ES or Vulkan option or extension, support
for it must be added to `tests/glfwinfo.c` and the behavior of the library when
the extension is missing documented in `docs/compat.dox`.
If you haven't already, read the excellent article [How to Write a Git Commit
Message](https://chris.beams.io/posts/git-commit/).
Features will not be rejected because they don't include all the above parts,
but please keep in mind that maintainer time is finite and that there are many
other features and bugs to work on.
Please also keep in mind that any part of the public API that has been included
in a release cannot be changed until the next _major_ version. Features can be
added and existing parts can sometimes be overloaded (in the general sense of
doing more things, not in the C++ sense), but code written to the API of one
minor release should both compile and run on subsequent minor releases.

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<doxygenlayout version="1.0">
<!-- Generated by doxygen 1.8.14 -->
<!-- Navigation index tabs for HTML output -->
<navindex>
<tab type="mainpage" visible="yes" title="Introduction"/>
<tab type="user" url="quick_guide.html" title="Tutorial"/>
<tab type="pages" visible="yes" title="Guides" intro=""/>
<tab type="modules" visible="yes" title="Reference" intro=""/>
<tab type="filelist" visible="yes" title="Files"/>
</navindex>
<!-- Layout definition for a file page -->
<file>
<detaileddescription title="Description"/>
<includes visible="$SHOW_INCLUDE_FILES"/>
<sourcelink visible="yes"/>
<memberdecl>
<constantgroups visible="yes" title=""/>
<defines title=""/>
<typedefs title=""/>
<enums title=""/>
<functions title=""/>
<variables title=""/>
<membergroups visible="yes"/>
</memberdecl>
<memberdef>
<defines title=""/>
<typedefs title=""/>
<enums title=""/>
<functions title=""/>
<variables title=""/>
</memberdef>
<authorsection/>
</file>
<!-- Layout definition for a group page -->
<group>
<detaileddescription title="Description"/>
<memberdecl>
<nestedgroups visible="yes" title=""/>
<dirs visible="yes" title=""/>
<files visible="yes" title=""/>
<defines title=""/>
<typedefs title=""/>
<enums title=""/>
<enumvalues title=""/>
<functions title=""/>
<variables title=""/>
</memberdecl>
<memberdef>
<pagedocs/>
<defines title=""/>
<typedefs title=""/>
<enums title=""/>
<enumvalues title=""/>
<functions title=""/>
<variables title=""/>
</memberdef>
<authorsection visible="yes"/>
</group>
<!-- Layout definition for a directory page -->
<directory>
<briefdescription visible="yes"/>
<memberdecl>
<dirs visible="yes"/>
<files visible="yes"/>
</memberdecl>
<detaileddescription title=""/>
</directory>
</doxygenlayout>

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# Support resources
See the [latest documentation](https://www.glfw.org/docs/latest/) for tutorials,
guides and the API reference.
If you have questions about using GLFW, we have a
[forum](https://discourse.glfw.org/), and the `#glfw` IRC channel on
[Libera.Chat](https://libera.chat/).
Bugs are reported to our [issue tracker](https://github.com/glfw/glfw/issues).
Please check the [contribution
guide](https://github.com/glfw/glfw/blob/master/docs/CONTRIBUTING.md) for
information on what to include when reporting a bug.

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/*!
@page build_guide Building applications
@tableofcontents
This is about compiling and linking applications that use GLFW. For information on
how to write such applications, start with the
[introductory tutorial](@ref quick_guide). For information on how to compile
the GLFW library itself, see @ref compile_guide.
This is not a tutorial on compilation or linking. It assumes basic
understanding of how to compile and link a C program as well as how to use the
specific compiler of your chosen development environment. The compilation
and linking process should be explained in your C programming material and in
the documentation for your development environment.
@section build_include Including the GLFW header file
You should include the GLFW header in the source files where you use OpenGL or
GLFW.
@code
#include <GLFW/glfw3.h>
@endcode
This header defines all the constants and declares all the types and function
prototypes of the GLFW API. By default it also includes the OpenGL header from
your development environment. See [option macros](@ref build_macros) below for
how to select OpenGL ES headers and more.
The GLFW header also defines any platform-specific macros needed by your OpenGL
header, so that it can be included without needing any window system headers.
It does this only when needed, so if window system headers are included, the
GLFW header does not try to redefine those symbols. The reverse is not true,
i.e. `windows.h` cannot cope if any Win32 symbols have already been defined.
In other words:
- Use the GLFW header to include OpenGL or OpenGL ES headers portably
- Do not include window system headers unless you will use those APIs directly
- If you do need such headers, include them before the GLFW header
If you are using an OpenGL extension loading library such as
[glad](https://github.com/Dav1dde/glad), the extension loader header should
be included before the GLFW one. GLFW attempts to detect any OpenGL or OpenGL
ES header or extension loader header included before it and will then disable
the inclusion of the default OpenGL header. Most extension loaders also define
macros that disable similar headers below it.
@code
#include <glad/gl.h>
#include <GLFW/glfw3.h>
@endcode
Both of these mechanisms depend on the extension loader header defining a known
macro. If yours doesn't or you don't know which one your users will pick, the
@ref GLFW_INCLUDE_NONE macro will explicitly to prevent the GLFW header from
including the OpenGL header. This will also allow you to include the two
headers in any order.
@code
#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>
#include <glad/gl.h>
@endcode
@subsection build_macros GLFW header option macros
These macros may be defined before the inclusion of the GLFW header and affect
its behavior.
@anchor GLFW_DLL
__GLFW_DLL__ is required on Windows when using the GLFW DLL, to tell the
compiler that the GLFW functions are defined in a DLL.
The following macros control which OpenGL or OpenGL ES API header is included.
Only one of these may be defined at a time.
@note GLFW does not provide any of the API headers mentioned below. They are
provided by your development environment or your OpenGL, OpenGL ES or Vulkan
SDK, and most of them can be downloaded from the
[Khronos Registry](https://www.khronos.org/registry/).
@anchor GLFW_INCLUDE_GLCOREARB
__GLFW_INCLUDE_GLCOREARB__ makes the GLFW header include the modern
`GL/glcorearb.h` header (`OpenGL/gl3.h` on macOS) instead of the regular OpenGL
header.
@anchor GLFW_INCLUDE_ES1
__GLFW_INCLUDE_ES1__ makes the GLFW header include the OpenGL ES 1.x `GLES/gl.h`
header instead of the regular OpenGL header.
@anchor GLFW_INCLUDE_ES2
__GLFW_INCLUDE_ES2__ makes the GLFW header include the OpenGL ES 2.0
`GLES2/gl2.h` header instead of the regular OpenGL header.
@anchor GLFW_INCLUDE_ES3
__GLFW_INCLUDE_ES3__ makes the GLFW header include the OpenGL ES 3.0
`GLES3/gl3.h` header instead of the regular OpenGL header.
@anchor GLFW_INCLUDE_ES31
__GLFW_INCLUDE_ES31__ makes the GLFW header include the OpenGL ES 3.1
`GLES3/gl31.h` header instead of the regular OpenGL header.
@anchor GLFW_INCLUDE_ES32
__GLFW_INCLUDE_ES32__ makes the GLFW header include the OpenGL ES 3.2
`GLES3/gl32.h` header instead of the regular OpenGL header.
@anchor GLFW_INCLUDE_NONE
__GLFW_INCLUDE_NONE__ makes the GLFW header not include any OpenGL or OpenGL ES
API header. This is useful in combination with an extension loading library.
If none of the above inclusion macros are defined, the standard OpenGL `GL/gl.h`
header (`OpenGL/gl.h` on macOS) is included, unless GLFW detects the inclusion
guards of any OpenGL, OpenGL ES or extension loader header it knows about.
The following macros control the inclusion of additional API headers. Any
number of these may be defined simultaneously, and/or together with one of the
above macros.
@anchor GLFW_INCLUDE_VULKAN
__GLFW_INCLUDE_VULKAN__ makes the GLFW header include the Vulkan
`vulkan/vulkan.h` header in addition to any selected OpenGL or OpenGL ES header.
@anchor GLFW_INCLUDE_GLEXT
__GLFW_INCLUDE_GLEXT__ makes the GLFW header include the appropriate extension
header for the OpenGL or OpenGL ES header selected above after and in addition
to that header.
@anchor GLFW_INCLUDE_GLU
__GLFW_INCLUDE_GLU__ makes the header include the GLU header in addition to the
header selected above. This should only be used with the standard OpenGL header
and only for compatibility with legacy code. GLU has been deprecated and should
not be used in new code.
@note None of these macros may be defined during the compilation of GLFW itself.
If your build includes GLFW and you define any these in your build files, make
sure they are not applied to the GLFW sources.
@section build_link Link with the right libraries
GLFW is essentially a wrapper of various platform-specific APIs and therefore
needs to link against many different system libraries. If you are using GLFW as
a shared library / dynamic library / DLL then it takes care of these links.
However, if you are using GLFW as a static library then your executable will
need to link against these libraries.
On Windows and macOS, the list of system libraries is static and can be
hard-coded into your build environment. See the section for your development
environment below. On Linux and other Unix-like operating systems, the list
varies but can be retrieved in various ways as described below.
A good general introduction to linking is
[Beginner's Guide to Linkers](https://www.lurklurk.org/linkers/linkers.html) by
David Drysdale.
@subsection build_link_win32 With MinGW or Visual C++ on Windows
The static version of the GLFW library is named `glfw3`. When using this
version, it is also necessary to link with some libraries that GLFW uses.
When using MinGW to link an application with the static version of GLFW, you
must also explicitly link with `gdi32`. Other toolchains including MinGW-w64
include it in the set of default libraries along with other dependencies like
`user32` and `kernel32`.
The link library for the GLFW DLL is named `glfw3dll`. When compiling an
application that uses the DLL version of GLFW, you need to define the @ref
GLFW_DLL macro _before_ any inclusion of the GLFW header. This can be done
either with a compiler switch or by defining it in your source code.
@subsection build_link_cmake_source With CMake and GLFW source
This section is about using CMake to compile and link GLFW along with your
application. If you want to use an installed binary instead, see @ref
build_link_cmake_package.
With a few changes to your `CMakeLists.txt` you can have the GLFW source tree
built along with your application.
When including GLFW as part of your build, you probably don't want to build the
GLFW tests, examples and documentation. To disable these, set the corresponding
cache variables before adding the GLFW source tree.
@code
set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
@endcode
Add the root directory of the GLFW source tree to your project. This will add
the `glfw` target to your project.
@code{.cmake}
add_subdirectory(path/to/glfw)
@endcode
Once GLFW has been added, link your application against the `glfw` target.
This adds the GLFW library and its link-time dependencies as it is currently
configured, the include directory for the GLFW header and, when applicable, the
@ref GLFW_DLL macro.
@code{.cmake}
target_link_libraries(myapp glfw)
@endcode
Note that the `glfw` target does not depend on OpenGL, as GLFW loads any OpenGL,
OpenGL ES or Vulkan libraries it needs at runtime. If your application calls
OpenGL directly, instead of using a modern
[extension loader library](@ref context_glext_auto), use the OpenGL CMake
package.
@code{.cmake}
find_package(OpenGL REQUIRED)
@endcode
If OpenGL is found, the `OpenGL::GL` target is added to your project, containing
library and include directory paths. Link against this like any other library.
@code{.cmake}
target_link_libraries(myapp OpenGL::GL)
@endcode
For a minimal example of a program and GLFW sources built with CMake, see the
[GLFW CMake Starter](https://github.com/juliettef/GLFW-CMake-starter) on GitHub.
@subsection build_link_cmake_package With CMake and installed GLFW binaries
This section is about using CMake to link GLFW after it has been built and
installed. If you want to build it along with your application instead, see
@ref build_link_cmake_source.
With a few changes to your `CMakeLists.txt` you can locate the package and
target files generated when GLFW is installed.
@code{.cmake}
find_package(glfw3 3.3 REQUIRED)
@endcode
Once GLFW has been added to the project, link against it with the `glfw` target.
This adds the GLFW library and its link-time dependencies, the include directory
for the GLFW header and, when applicable, the @ref GLFW_DLL macro.
@code{.cmake}
target_link_libraries(myapp glfw)
@endcode
Note that the `glfw` target does not depend on OpenGL, as GLFW loads any OpenGL,
OpenGL ES or Vulkan libraries it needs at runtime. If your application calls
OpenGL directly, instead of using a modern
[extension loader library](@ref context_glext_auto), use the OpenGL CMake
package.
@code{.cmake}
find_package(OpenGL REQUIRED)
@endcode
If OpenGL is found, the `OpenGL::GL` target is added to your project, containing
library and include directory paths. Link against this like any other library.
@code{.cmake}
target_link_libraries(myapp OpenGL::GL)
@endcode
@subsection build_link_pkgconfig With makefiles and pkg-config on Unix
GLFW supports [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/),
and the `glfw3.pc` pkg-config file is generated when the GLFW library is built
and is installed along with it. A pkg-config file describes all necessary
compile-time and link-time flags and dependencies needed to use a library. When
they are updated or if they differ between systems, you will get the correct
ones automatically.
A typical compile and link command-line when using the static version of the
GLFW library may look like this:
@code{.sh}
cc $(pkg-config --cflags glfw3) -o myprog myprog.c $(pkg-config --static --libs glfw3)
@endcode
If you are using the shared version of the GLFW library, omit the `--static`
flag.
@code{.sh}
cc $(pkg-config --cflags glfw3) -o myprog myprog.c $(pkg-config --libs glfw3)
@endcode
You can also use the `glfw3.pc` file without installing it first, by using the
`PKG_CONFIG_PATH` environment variable.
@code{.sh}
env PKG_CONFIG_PATH=path/to/glfw/src cc $(pkg-config --cflags glfw3) -o myprog myprog.c $(pkg-config --libs glfw3)
@endcode
The dependencies do not include OpenGL, as GLFW loads any OpenGL, OpenGL ES or
Vulkan libraries it needs at runtime. If your application calls OpenGL
directly, instead of using a modern
[extension loader library](@ref context_glext_auto), you should add the `gl`
pkg-config package.
@code{.sh}
cc $(pkg-config --cflags glfw3 gl) -o myprog myprog.c $(pkg-config --libs glfw3 gl)
@endcode
@subsection build_link_xcode With Xcode on macOS
If you are using the dynamic library version of GLFW, add it to the project
dependencies.
If you are using the static library version of GLFW, add it and the Cocoa,
OpenGL and IOKit frameworks to the project as dependencies. They can all be
found in `/System/Library/Frameworks`.
@subsection build_link_osx With command-line on macOS
It is recommended that you use [pkg-config](@ref build_link_pkgconfig) when
building from the command line on macOS. That way you will get any new
dependencies added automatically. If you still wish to build manually, you need
to add the required frameworks and libraries to your command-line yourself using
the `-l` and `-framework` switches.
If you are using the dynamic GLFW library, which is named `libglfw.3.dylib`, do:
@code{.sh}
cc -o myprog myprog.c -lglfw -framework Cocoa -framework OpenGL -framework IOKit
@endcode
If you are using the static library, named `libglfw3.a`, substitute `-lglfw3`
for `-lglfw`.
Note that you do not add the `.framework` extension to a framework when linking
against it from the command-line.
@note Your machine may have `libGL.*.dylib` style OpenGL library, but that is
for the X Window System and will not work with the macOS native version of GLFW.
*/

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/*!
@page compat_guide Standards conformance
@tableofcontents
This guide describes the various API extensions used by this version of GLFW.
It lists what are essentially implementation details, but which are nonetheless
vital knowledge for developers intending to deploy their applications on a wide
range of machines.
The information in this guide is not a part of GLFW API, but merely
preconditions for some parts of the library to function on a given machine. Any
part of this information may change in future versions of GLFW and that will not
be considered a breaking API change.
@section compat_x11 X11 extensions, protocols and IPC standards
As GLFW uses Xlib directly, without any intervening toolkit
library, it has sole responsibility for interacting well with the many and
varied window managers in use on Unix-like systems. In order for applications
and window managers to work well together, a number of standards and
conventions have been developed that regulate behavior outside the scope of the
X11 API; most importantly the
[Inter-Client Communication Conventions Manual](https://www.tronche.com/gui/x/icccm/)
(ICCCM) and
[Extended Window Manager Hints](https://standards.freedesktop.org/wm-spec/wm-spec-latest.html)
(EWMH) standards.
GLFW uses the `_MOTIF_WM_HINTS` window property to support borderless windows.
If the running window manager does not support this property, the
`GLFW_DECORATED` hint will have no effect.
GLFW uses the ICCCM `WM_DELETE_WINDOW` protocol to intercept the user
attempting to close the GLFW window. If the running window manager does not
support this protocol, the close callback will never be called.
GLFW uses the EWMH `_NET_WM_PING` protocol, allowing the window manager notify
the user when the application has stopped responding, i.e. when it has ceased to
process events. If the running window manager does not support this protocol,
the user will not be notified if the application locks up.
GLFW uses the EWMH `_NET_WM_STATE_FULLSCREEN` window state to tell the window
manager to make the GLFW window full screen. If the running window manager does
not support this state, full screen windows may not work properly. GLFW has
a fallback code path in case this state is unavailable, but every window manager
behaves slightly differently in this regard.
GLFW uses the EWMH `_NET_WM_BYPASS_COMPOSITOR` window property to tell a
compositing window manager to un-redirect full screen GLFW windows. If the
running window manager uses compositing but does not support this property then
additional copying may be performed for each buffer swap of full screen windows.
GLFW uses the
[clipboard manager protocol](https://www.freedesktop.org/wiki/ClipboardManager/)
to push a clipboard string (i.e. selection) owned by a GLFW window about to be
destroyed to the clipboard manager. If there is no running clipboard manager,
the clipboard string will be unavailable once the window has been destroyed.
GLFW uses the
[X drag-and-drop protocol](https://www.freedesktop.org/wiki/Specifications/XDND/)
to provide file drop events. If the application originating the drag does not
support this protocol, drag and drop will not work.
GLFW uses the XRandR 1.3 extension to provide multi-monitor support. If the
running X server does not support this version of this extension, multi-monitor
support will not function and only a single, desktop-spanning monitor will be
reported.
GLFW uses the XRandR 1.3 and Xf86vidmode extensions to provide gamma ramp
support. If the running X server does not support either or both of these
extensions, gamma ramp support will not function.
GLFW uses the Xkb extension and detectable auto-repeat to provide keyboard
input. If the running X server does not support this extension, a non-Xkb
fallback path is used.
GLFW uses the XInput2 extension to provide raw, non-accelerated mouse motion
when the cursor is disabled. If the running X server does not support this
extension, regular accelerated mouse motion will be used.
GLFW uses both the XRender extension and the compositing manager to support
transparent window framebuffers. If the running X server does not support this
extension or there is no running compositing manager, the
`GLFW_TRANSPARENT_FRAMEBUFFER` framebuffer hint will have no effect.
@section compat_wayland Wayland protocols and IPC standards
As GLFW uses libwayland directly, without any intervening toolkit library, it
has sole responsibility for interacting well with every compositor in use on
Unix-like systems. Most of the features are provided by the core protocol,
while cursor support is provided by the libwayland-cursor helper library, EGL
integration by libwayland-egl, and keyboard handling by
[libxkbcommon](https://xkbcommon.org/). In addition, GLFW uses some protocols
from wayland-protocols to provide additional features if the compositor
supports them.
GLFW uses xkbcommon 0.5.0 to provide compose key support. When it has been
built against an older xkbcommon, the compose key will be disabled even if it
has been configured in the compositor.
GLFW uses the [xdg-shell
protocol](https://cgit.freedesktop.org/wayland/wayland-protocols/tree/stable/xdg-shell/xdg-shell.xml)
to provide better window management. This protocol is part of
wayland-protocols 1.12, and mandatory at build time. If the running compositor
does not support this protocol, the older [wl_shell
interface](https://cgit.freedesktop.org/wayland/wayland/tree/protocol/wayland.xml#n972)
will be used instead. This will result in a worse integration with the
desktop, especially on tiling compositors.
GLFW uses the [relative pointer
protocol](https://cgit.freedesktop.org/wayland/wayland-protocols/tree/unstable/relative-pointer/relative-pointer-unstable-v1.xml)
alongside the [pointer constraints
protocol](https://cgit.freedesktop.org/wayland/wayland-protocols/tree/unstable/pointer-constraints/pointer-constraints-unstable-v1.xml)
to implement disabled cursor. These two protocols are part of
wayland-protocols 1.1, and mandatory at build time. If the running compositor
does not support both of these protocols, disabling the cursor will have no
effect.
GLFW uses the [idle inhibit
protocol](https://cgit.freedesktop.org/wayland/wayland-protocols/tree/unstable/idle-inhibit/idle-inhibit-unstable-v1.xml)
to prohibit the screensaver from starting. This protocol is part of
wayland-protocols 1.6, and mandatory at build time. If the running compositor
does not support this protocol, the screensaver may start even for full screen
windows.
GLFW uses the [xdg-decoration
protocol](https://cgit.freedesktop.org/wayland/wayland-protocols/tree/unstable/xdg-decoration/xdg-decoration-unstable-v1.xml)
to request decorations to be drawn around its windows. This protocol is part
of wayland-protocols 1.15, and mandatory at build time. If the running
compositor does not support this protocol, a very simple frame will be drawn by
GLFW itself, using the [viewporter
protocol](https://cgit.freedesktop.org/wayland/wayland-protocols/tree/stable/viewporter/viewporter.xml)
alongside
[subsurfaces](https://cgit.freedesktop.org/wayland/wayland/tree/protocol/wayland.xml#n2598).
This protocol is part of wayland-protocols 1.4, and mandatory at build time.
If the running compositor does not support this protocol either, no decorations
will be drawn around windows.
@section compat_glx GLX extensions
The GLX API is the default API used to create OpenGL contexts on Unix-like
systems using the X Window System.
GLFW uses the GLX 1.3 `GLXFBConfig` functions to enumerate and select framebuffer pixel
formats. If GLX 1.3 is not supported, @ref glfwInit will fail.
GLFW uses the `GLX_MESA_swap_control,` `GLX_EXT_swap_control` and
`GLX_SGI_swap_control` extensions to provide vertical retrace synchronization
(or _vsync_), in that order of preference. Where none of these extension are
available, calling @ref glfwSwapInterval will have no effect.
GLFW uses the `GLX_ARB_multisample` extension to create contexts with
multisampling anti-aliasing. Where this extension is unavailable, the
`GLFW_SAMPLES` hint will have no effect.
GLFW uses the `GLX_ARB_create_context` extension when available, even when
creating OpenGL contexts of version 2.1 and below. Where this extension is
unavailable, the `GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR`
hints will only be partially supported, the `GLFW_OPENGL_DEBUG_CONTEXT` hint
will have no effect, and setting the `GLFW_OPENGL_PROFILE` or
`GLFW_OPENGL_FORWARD_COMPAT` hints to `GLFW_TRUE` will cause @ref
glfwCreateWindow to fail.
GLFW uses the `GLX_ARB_create_context_profile` extension to provide support for
context profiles. Where this extension is unavailable, setting the
`GLFW_OPENGL_PROFILE` hint to anything but `GLFW_OPENGL_ANY_PROFILE`, or setting
`GLFW_CLIENT_API` to anything but `GLFW_OPENGL_API` or `GLFW_NO_API` will cause
@ref glfwCreateWindow to fail.
GLFW uses the `GLX_ARB_context_flush_control` extension to provide control over
whether a context is flushed when it is released (made non-current). Where this
extension is unavailable, the `GLFW_CONTEXT_RELEASE_BEHAVIOR` hint will have no
effect and the context will always be flushed when released.
GLFW uses the `GLX_ARB_framebuffer_sRGB` and `GLX_EXT_framebuffer_sRGB`
extensions to provide support for sRGB framebuffers. Where both of these
extensions are unavailable, the `GLFW_SRGB_CAPABLE` hint will have no effect.
@section compat_wgl WGL extensions
The WGL API is used to create OpenGL contexts on Microsoft Windows and other
implementations of the Win32 API, such as Wine.
GLFW uses either the `WGL_EXT_extension_string` or the
`WGL_ARB_extension_string` extension to check for the presence of all other WGL
extensions listed below. If both are available, the EXT one is preferred. If
neither is available, no other extensions are used and many GLFW features
related to context creation will have no effect or cause errors when used.
GLFW uses the `WGL_EXT_swap_control` extension to provide vertical retrace
synchronization (or _vsync_). Where this extension is unavailable, calling @ref
glfwSwapInterval will have no effect.
GLFW uses the `WGL_ARB_pixel_format` and `WGL_ARB_multisample` extensions to
create contexts with multisampling anti-aliasing. Where these extensions are
unavailable, the `GLFW_SAMPLES` hint will have no effect.
GLFW uses the `WGL_ARB_create_context` extension when available, even when
creating OpenGL contexts of version 2.1 and below. Where this extension is
unavailable, the `GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR`
hints will only be partially supported, the `GLFW_OPENGL_DEBUG_CONTEXT` hint
will have no effect, and setting the `GLFW_OPENGL_PROFILE` or
`GLFW_OPENGL_FORWARD_COMPAT` hints to `GLFW_TRUE` will cause @ref
glfwCreateWindow to fail.
GLFW uses the `WGL_ARB_create_context_profile` extension to provide support for
context profiles. Where this extension is unavailable, setting the
`GLFW_OPENGL_PROFILE` hint to anything but `GLFW_OPENGL_ANY_PROFILE` will cause
@ref glfwCreateWindow to fail.
GLFW uses the `WGL_ARB_context_flush_control` extension to provide control over
whether a context is flushed when it is released (made non-current). Where this
extension is unavailable, the `GLFW_CONTEXT_RELEASE_BEHAVIOR` hint will have no
effect and the context will always be flushed when released.
GLFW uses the `WGL_ARB_framebuffer_sRGB` and `WGL_EXT_framebuffer_sRGB`
extensions to provide support for sRGB framebuffers. Where both of these
extension are unavailable, the `GLFW_SRGB_CAPABLE` hint will have no effect.
@section compat_osx OpenGL on macOS
Support for OpenGL 3.2 and above was introduced with OS X 10.7 and even then
only forward-compatible, core profile contexts are supported. Support for
OpenGL 4.1 was introduced with OS X 10.9, also limited to forward-compatible,
core profile contexts. There is also still no mechanism for requesting debug
contexts or no-error contexts. Versions of Mac OS X earlier than 10.7 support
at most OpenGL version 2.1.
Because of this, on OS X 10.7 and later, the `GLFW_CONTEXT_VERSION_MAJOR` and
`GLFW_CONTEXT_VERSION_MINOR` hints will cause @ref glfwCreateWindow to fail if
given version 3.0 or 3.1. The `GLFW_OPENGL_FORWARD_COMPAT` hint must be set to
`GLFW_TRUE` and the `GLFW_OPENGL_PROFILE` hint must be set to
`GLFW_OPENGL_CORE_PROFILE` when creating OpenGL 3.2 and later contexts. The
`GLFW_OPENGL_DEBUG_CONTEXT` and `GLFW_CONTEXT_NO_ERROR` hints are ignored.
Also, on Mac OS X 10.6 and below, the `GLFW_CONTEXT_VERSION_MAJOR` and
`GLFW_CONTEXT_VERSION_MINOR` hints will fail if given a version above 2.1,
setting the `GLFW_OPENGL_PROFILE` or `GLFW_OPENGL_FORWARD_COMPAT` hints to
a non-default value will cause @ref glfwCreateWindow to fail and the
`GLFW_OPENGL_DEBUG_CONTEXT` hint is ignored.
@section compat_vulkan Vulkan loader and API
By default, GLFW uses the standard system-wide Vulkan loader to access the
Vulkan API on all platforms except macOS. This is installed by both graphics
drivers and Vulkan SDKs. If either the loader or at least one minimally
functional ICD is missing, @ref glfwVulkanSupported will return `GLFW_FALSE` and
all other Vulkan-related functions will fail with an @ref GLFW_API_UNAVAILABLE
error.
@section compat_wsi Vulkan WSI extensions
The Vulkan WSI extensions are used to create Vulkan surfaces for GLFW windows on
all supported platforms.
GLFW uses the `VK_KHR_surface` and `VK_KHR_win32_surface` extensions to create
surfaces on Microsoft Windows. If any of these extensions are not available,
@ref glfwGetRequiredInstanceExtensions will return an empty list and window
surface creation will fail.
GLFW uses the `VK_KHR_surface` and either the `VK_MVK_macos_surface` or
`VK_EXT_metal_surface` extensions to create surfaces on macOS. If any of these
extensions are not available, @ref glfwGetRequiredInstanceExtensions will
return an empty list and window surface creation will fail.
GLFW uses the `VK_KHR_surface` and either the `VK_KHR_xlib_surface` or
`VK_KHR_xcb_surface` extensions to create surfaces on X11. If `VK_KHR_surface`
or both `VK_KHR_xlib_surface` and `VK_KHR_xcb_surface` are not available, @ref
glfwGetRequiredInstanceExtensions will return an empty list and window surface
creation will fail.
GLFW uses the `VK_KHR_surface` and `VK_KHR_wayland_surface` extensions to create
surfaces on Wayland. If any of these extensions are not available, @ref
glfwGetRequiredInstanceExtensions will return an empty list and window surface
creation will fail.
*/

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/*!
@page compile_guide Compiling GLFW
@tableofcontents
This is about compiling the GLFW library itself. For information on how to
build applications that use GLFW, see @ref build_guide.
@section compile_cmake Using CMake
@note GLFW behaves like most other libraries that use CMake so this guide mostly
describes the basic configure/generate/compile sequence. If you are already
familiar with this from other projects, you may want to focus on the @ref
compile_deps and @ref compile_options sections for GLFW-specific information.
GLFW uses [CMake](https://cmake.org/) to generate project files or makefiles
for your chosen development environment. To compile GLFW, first generate these
files with CMake and then use them to compile the GLFW library.
If you are on Windows and macOS you can
[download CMake](https://cmake.org/download/) from their site.
If you are on a Unix-like system such as Linux, FreeBSD or Cygwin or have
a package system like Fink, MacPorts or Homebrew, you can install its CMake
package.
CMake is a complex tool and this guide will only show a few of the possible ways
to set up and compile GLFW. The CMake project has their own much more detailed
[CMake user guide](https://cmake.org/cmake/help/latest/guide/user-interaction/)
that includes everything in this guide not specific to GLFW. It may be a useful
companion to this one.
@subsection compile_deps Installing dependencies
The C/C++ development environments in Visual Studio, Xcode and MinGW come with
all necessary dependencies for compiling GLFW, but on Unix-like systems like
Linux and FreeBSD you will need a few extra packages.
@subsubsection compile_deps_x11 Dependencies for X11 on Unix-like systems
To compile GLFW for X11, you need to have the X11 development packages
installed. They are not needed to build or run programs that use GLFW.
On Debian and derivates like Ubuntu and Linux Mint the `xorg-dev` meta-package
pulls in the development packages for all of X11.
@code{.sh}
sudo apt install xorg-dev
@endcode
On Fedora and derivatives like Red Hat the X11 extension packages
`libXcursor-devel`, `libXi-devel`, `libXinerama-devel` and `libXrandr-devel`
required by GLFW pull in all its other dependencies.
@code{.sh}
sudo dnf install libXcursor-devel libXi-devel libXinerama-devel libXrandr-devel
@endcode
On FreeBSD the X11 headers are installed along the end-user X11 packages, so if
you have an X server running you should have the headers as well. If not,
install the `xorgproto` package.
@code{.sh}
pkg install xorgproto
@endcode
On Cygwin the `xorgproto` package in the Devel section of the GUI installer will
install the headers and other development related files for all of X11.
Once you have the required depdendencies, move on to @ref compile_generate.
@subsubsection compile_deps_wayland Dependencies for Wayland on Unix-like systems
To compile GLFW for Wayland, you need to have the Wayland and xkbcommon
development packages installed. They are not needed to build or run programs
that use GLFW.
On Debian and derivates like Ubuntu and Linux Mint you will need the `libwayland-dev`,
`libxkbcommon-dev`, `wayland-protocols` and `extra-cmake-modules` packages.
@code{.sh}
sudo apt install libwayland-dev libxkbcommon-dev wayland-protocols extra-cmake-modules
@endcode
On Fedora and derivatives like Red Hat you will need the `wayland-devel`,
`libxkbcommon-devel`, `wayland-protocols-devel` and `extra-cmake-modules` packages.
@code{.sh}
sudo dnf install wayland-devel libxkbcommon-devel wayland-protocols-devel extra-cmake-modules
@endcode
On FreeBSD you will need the `wayland`, `libxkbcommon`, `wayland-protocols` and
`kf5-extra-cmake-modules` packages.
@code{.sh}
pkg install wayland libxkbcommon wayland-protocols kf5-extra-cmake-modules
@endcode
Once you have the required depdendencies, move on to @ref compile_generate.
@subsection compile_generate Generating build files with CMake
Once you have all necessary dependencies it is time to generate the project
files or makefiles for your development environment. CMake needs two paths for
this:
- the path to the root directory of the GLFW source tree (not its `src`
subdirectory)
- the path to the directory where the generated build files and compiled
binaries will be placed
If these are the same, it is called an in-tree build, otherwise it is called an
out-of-tree build.
Out-of-tree builds are recommended as they avoid cluttering up the source tree.
They also allow you to have several build directories for different
configurations all using the same source tree.
A common pattern when building a single configuration is to have a build
directory named `build` in the root of the source tree.
@subsubsection compile_generate_gui Generating files with the CMake GUI
Start the CMake GUI and set the paths to the source and build directories
described above. Then press _Configure_ and _Generate_.
If you wish change any CMake variables in the list, press _Configure_ and then
_Generate_ to have the new values take effect. The variable list will be
populated after the first configure step.
By default GLFW will use X11 on Linux and other Unix-like systems other
than macOS. To use Wayland instead, set the `GLFW_USE_WAYLAND` option in the
GLFW section of the variable list, then apply the new value as described above.
Once you have generated the project files or makefiles for your chosen
development environment, move on to @ref compile_compile.
@subsubsection compile_generate_cli Generating files with the CMake command-line tool
To make a build directory, pass the source and build directories to the `cmake`
command. These can be relative or absolute paths. The build directory is
created if it doesn't already exist.
@code{.sh}
cmake -S path/to/glfw -B path/to/build
@endcode
It is common to name the build directory `build` and place it in the root of the
source tree when only planning to build a single configuration.
@code{.sh}
cd path/to/glfw
cmake -S . -B build
@endcode
Without other flags these will generate Visual Studio project files on Windows
and makefiles on other platforms. You can choose other targets using the `-G`
flag.
@code{.sh}
cmake -S path/to/glfw -B path/to/build -G Xcode
@endcode
By default GLFW will use X11 on Linux and other Unix-like systems other
than macOS. To use Wayland instead, set the `GLFW_USE_WAYLAND` CMake option.
@code{.sh}
cmake -S path/to/glfw -B path/to/build -D GLFW_USE_WAYLAND=1
@endcode
Once you have generated the project files or makefiles for your chosen
development environment, move on to @ref compile_compile.
@subsection compile_compile Compiling the library
You should now have all required dependencies and the project files or makefiles
necessary to compile GLFW. Go ahead and compile the actual GLFW library with
these files as you would with any other project.
With Visual Studio open `GLFW.sln` and use the Build menu. With Xcode open
`GLFW.xcodeproj` and use the Project menu.
With Linux, macOS and other forms of Unix, run `make`.
@code{.sh}
cd path/to/build
make
@endcode
With MinGW, it is `mingw32-make`.
@code{.sh}
cd path/to/build
mingw32-make
@endcode
Any CMake build directory can also be built with the `cmake` command and the
`--build` flag.
@code{.sh}
cmake --build path/to/build
@endcode
This will run the platform specific build tool the directory was generated for.
Once the GLFW library is compiled you are ready to build your application,
linking it to the GLFW library. See @ref build_guide for more information.
@section compile_options CMake options
The CMake files for GLFW provide a number of options, although not all are
available on all supported platforms. Some of these are de facto standards
among projects using CMake and so have no `GLFW_` prefix.
If you are using the GUI version of CMake, these are listed and can be changed
from there. If you are using the command-line version of CMake you can use the
`ccmake` ncurses GUI to set options. Some package systems like Ubuntu and other
distributions based on Debian GNU/Linux have this tool in a separate
`cmake-curses-gui` package.
Finally, if you don't want to use any GUI, you can set options from the `cmake`
command-line with the `-D` flag.
@code{.sh}
cmake -S path/to/glfw -B path/to/build -D BUILD_SHARED_LIBS=ON
@endcode
@subsection compile_options_shared Shared CMake options
@anchor BUILD_SHARED_LIBS
__BUILD_SHARED_LIBS__ determines whether GLFW is built as a static
library or as a DLL / shared library / dynamic library. This is disabled by
default, producing a static GLFW library.
@anchor GLFW_BUILD_EXAMPLES
__GLFW_BUILD_EXAMPLES__ determines whether the GLFW examples are built
along with the library.
@anchor GLFW_BUILD_TESTS
__GLFW_BUILD_TESTS__ determines whether the GLFW test programs are
built along with the library.
@anchor GLFW_BUILD_DOCS
__GLFW_BUILD_DOCS__ determines whether the GLFW documentation is built along
with the library. This is enabled by default if
[Doxygen](https://www.doxygen.nl/) is found by CMake during configuration.
@anchor GLFW_VULKAN_STATIC
__GLFW_VULKAN_STATIC__ determines whether to use the Vulkan loader linked
directly with the application. This is disabled by default.
@subsection compile_options_win32 Windows specific CMake options
@anchor USE_MSVC_RUNTIME_LIBRARY_DLL
__USE_MSVC_RUNTIME_LIBRARY_DLL__ determines whether to use the DLL version or the
static library version of the Visual C++ runtime library. When enabled, the
DLL version of the Visual C++ library is used. This is enabled by default.
On CMake 3.15 and later you can set the standard CMake
[CMAKE_MSVC_RUNTIME_LIBRARY](https://cmake.org/cmake/help/latest/variable/CMAKE_MSVC_RUNTIME_LIBRARY.html)
variable instead of this GLFW-specific option.
@anchor GLFW_USE_HYBRID_HPG
__GLFW_USE_HYBRID_HPG__ determines whether to export the `NvOptimusEnablement` and
`AmdPowerXpressRequestHighPerformance` symbols, which force the use of the
high-performance GPU on Nvidia Optimus and AMD PowerXpress systems. These symbols
need to be exported by the EXE to be detected by the driver, so the override
will not work if GLFW is built as a DLL. This is disabled by default, letting
the operating system and driver decide.
@subsection compile_options_wayland Wayland specific CMake options
@anchor GLFW_USE_WAYLAND
__GLFW_USE_WAYLAND__ determines whether to compile the library for Wayland.
This option is only available on Linux and other Unix-like systems other than
macOS. This is disabled by default.
@section compile_mingw_cross Cross-compilation with CMake and MinGW
Both Cygwin and many Linux distributions have MinGW or MinGW-w64 packages. For
example, Cygwin has the `mingw64-i686-gcc` and `mingw64-x86_64-gcc` packages
for 32- and 64-bit version of MinGW-w64, while Debian GNU/Linux and derivatives
like Ubuntu have the `mingw-w64` package for both.
GLFW has CMake toolchain files in the `CMake` subdirectory that set up
cross-compilation of Windows binaries. To use these files you set the
`CMAKE_TOOLCHAIN_FILE` CMake variable with the `-D` flag add an option when
configuring and generating the build files.
@code{.sh}
cmake -S path/to/glfw -B path/to/build -D CMAKE_TOOLCHAIN_FILE=path/to/file
@endcode
The exact toolchain file to use depends on the prefix used by the MinGW or
MinGW-w64 binaries on your system. You can usually see this in the /usr
directory. For example, both the Ubuntu and Cygwin MinGW-w64 packages have
`/usr/x86_64-w64-mingw32` for the 64-bit compilers, so the correct invocation
would be:
@code{.sh}
cmake -S path/to/glfw -B path/to/build -D CMAKE_TOOLCHAIN_FILE=CMake/x86_64-w64-mingw32.cmake
@endcode
The path to the toolchain file is relative to the path to the GLFW source tree
passed to the `-S` flag, not to the current directory.
For more details see the
[CMake toolchain guide](https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html).
@section compile_manual Compiling GLFW manually
If you wish to compile GLFW without its CMake build environment then you will
have to do at least some of the platform detection yourself. GLFW needs
a configuration macro to be defined in order to know what window system it is
being compiled for and also has optional, platform-specific ones for various
features.
When building with CMake, the `glfw_config.h` configuration header is generated
based on the current platform and CMake options. The GLFW CMake environment
defines @b GLFW_USE_CONFIG_H, which causes this header to be included by
`internal.h`. Without this macro, GLFW will expect the necessary configuration
macros to be defined on the command-line.
The window creation API is used to create windows, handle input, monitors, gamma
ramps and clipboard. The options are:
- @b _GLFW_COCOA to use the Cocoa frameworks
- @b _GLFW_WIN32 to use the Win32 API
- @b _GLFW_X11 to use the X Window System
- @b _GLFW_WAYLAND to use the Wayland API (experimental and incomplete)
- @b _GLFW_OSMESA to use the OSMesa API (headless and non-interactive)
If you are building GLFW as a shared library / dynamic library / DLL then you
must also define @b _GLFW_BUILD_DLL. Otherwise, you must not define it.
If you are linking the Vulkan loader directly with your application then you
must also define @b _GLFW_VULKAN_STATIC. Otherwise, GLFW will attempt to use the
external version.
If you are using a custom name for the Vulkan, EGL, GLX, OSMesa, OpenGL, GLESv1
or GLESv2 library, you can override the default names by defining those you need
of @b _GLFW_VULKAN_LIBRARY, @b _GLFW_EGL_LIBRARY, @b _GLFW_GLX_LIBRARY, @b
_GLFW_OSMESA_LIBRARY, @b _GLFW_OPENGL_LIBRARY, @b _GLFW_GLESV1_LIBRARY and @b
_GLFW_GLESV2_LIBRARY. Otherwise, GLFW will use the built-in default names.
@note None of the @ref build_macros may be defined during the compilation of
GLFW. If you define any of these in your build files, make sure they are not
applied to the GLFW sources.
*/

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/*!
@page context_guide Context guide
@tableofcontents
This guide introduces the OpenGL and OpenGL ES context related functions of
GLFW. For details on a specific function in this category, see the @ref
context. There are also guides for the other areas of the GLFW API.
- @ref intro_guide
- @ref window_guide
- @ref vulkan_guide
- @ref monitor_guide
- @ref input_guide
@section context_object Context objects
A window object encapsulates both a top-level window and an OpenGL or OpenGL ES
context. It is created with @ref glfwCreateWindow and destroyed with @ref
glfwDestroyWindow or @ref glfwTerminate. See @ref window_creation for more
information.
As the window and context are inseparably linked, the window object also serves
as the context handle.
To test the creation of various kinds of contexts and see their properties, run
the `glfwinfo` test program.
@note Vulkan does not have a context and the Vulkan instance is created via the
Vulkan API itself. If you will be using Vulkan to render to a window, disable
context creation by setting the [GLFW_CLIENT_API](@ref GLFW_CLIENT_API_hint)
hint to `GLFW_NO_API`. For more information, see the @ref vulkan_guide.
@subsection context_hints Context creation hints
There are a number of hints, specified using @ref glfwWindowHint, related to
what kind of context is created. See
[context related hints](@ref window_hints_ctx) in the window guide.
@subsection context_sharing Context object sharing
When creating a window and its OpenGL or OpenGL ES context with @ref
glfwCreateWindow, you can specify another window whose context the new one
should share its objects (textures, vertex and element buffers, etc.) with.
@code
GLFWwindow* second_window = glfwCreateWindow(640, 480, "Second Window", NULL, first_window);
@endcode
Object sharing is implemented by the operating system and graphics driver. On
platforms where it is possible to choose which types of objects are shared, GLFW
requests that all types are shared.
See the relevant chapter of the [OpenGL](https://www.opengl.org/registry/) or
[OpenGL ES](https://www.khronos.org/opengles/) reference documents for more
information. The name and number of this chapter unfortunately varies between
versions and APIs, but has at times been named _Shared Objects and Multiple
Contexts_.
GLFW comes with a barebones object sharing example program called `sharing`.
@subsection context_offscreen Offscreen contexts
GLFW doesn't support creating contexts without an associated window. However,
contexts with hidden windows can be created with the
[GLFW_VISIBLE](@ref GLFW_VISIBLE_hint) window hint.
@code
glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
GLFWwindow* offscreen_context = glfwCreateWindow(640, 480, "", NULL, NULL);
@endcode
The window never needs to be shown and its context can be used as a plain
offscreen context. Depending on the window manager, the size of a hidden
window's framebuffer may not be usable or modifiable, so framebuffer
objects are recommended for rendering with such contexts.
You should still [process events](@ref events) as long as you have at least one
window, even if none of them are visible.
@macos The first time a window is created the menu bar is created. This is not
desirable for example when writing a command-line only application. Menu bar
creation can be disabled with the @ref GLFW_COCOA_MENUBAR init hint.
@subsection context_less Windows without contexts
You can disable context creation by setting the
[GLFW_CLIENT_API](@ref GLFW_CLIENT_API_hint) hint to `GLFW_NO_API`. Windows
without contexts must not be passed to @ref glfwMakeContextCurrent or @ref
glfwSwapBuffers.
@section context_current Current context
Before you can make OpenGL or OpenGL ES calls, you need to have a current
context of the correct type. A context can only be current for a single thread
at a time, and a thread can only have a single context current at a time.
When moving a context between threads, you must make it non-current on the old
thread before making it current on the new one.
The context of a window is made current with @ref glfwMakeContextCurrent.
@code
glfwMakeContextCurrent(window);
@endcode
The window of the current context is returned by @ref glfwGetCurrentContext.
@code
GLFWwindow* window = glfwGetCurrentContext();
@endcode
The following GLFW functions require a context to be current. Calling any these
functions without a current context will generate a @ref GLFW_NO_CURRENT_CONTEXT
error.
- @ref glfwSwapInterval
- @ref glfwExtensionSupported
- @ref glfwGetProcAddress
@section context_swap Buffer swapping
See @ref buffer_swap in the window guide.
@section context_glext OpenGL and OpenGL ES extensions
One of the benefits of OpenGL and OpenGL ES is their extensibility.
Hardware vendors may include extensions in their implementations that extend the
API before that functionality is included in a new version of the OpenGL or
OpenGL ES specification, and some extensions are never included and remain
as extensions until they become obsolete.
An extension is defined by:
- An extension name (e.g. `GL_ARB_gl_spirv`)
- New OpenGL tokens (e.g. `GL_SPIR_V_BINARY_ARB`)
- New OpenGL functions (e.g. `glSpecializeShaderARB`)
Note the `ARB` affix, which stands for Architecture Review Board and is used
for official extensions. The extension above was created by the ARB, but there
are many different affixes, like `NV` for Nvidia and `AMD` for, well, AMD. Any
group may also use the generic `EXT` affix. Lists of extensions, together with
their specifications, can be found at the
[OpenGL Registry](https://www.opengl.org/registry/) and
[OpenGL ES Registry](https://www.khronos.org/registry/gles/).
@subsection context_glext_auto Loading extension with a loader library
An extension loader library is the easiest and best way to access both OpenGL and
OpenGL ES extensions and modern versions of the core OpenGL or OpenGL ES APIs.
They will take care of all the details of declaring and loading everything you
need. One such library is [glad](https://github.com/Dav1dde/glad) and there are
several others.
The following example will use glad but all extension loader libraries work
similarly.
First you need to generate the source files using the glad Python script. This
example generates a loader for any version of OpenGL, which is the default for
both GLFW and glad, but loaders for OpenGL ES, as well as loaders for specific
API versions and extension sets can be generated. The generated files are
written to the `output` directory.
@code{.sh}
python main.py --generator c --no-loader --out-path output
@endcode
The `--no-loader` option is added because GLFW already provides a function for
loading OpenGL and OpenGL ES function pointers, one that automatically uses the
selected context creation API, and glad can call this instead of having to
implement its own. There are several other command-line options as well. See
the glad documentation for details.
Add the generated `output/src/glad.c`, `output/include/glad/glad.h` and
`output/include/KHR/khrplatform.h` files to your build. Then you need to
include the glad header file, which will replace the OpenGL header of your
development environment. By including the glad header before the GLFW header,
it suppresses the development environment's OpenGL or OpenGL ES header.
@code
#include <glad/glad.h>
#include <GLFW/glfw3.h>
@endcode
Finally you need to initialize glad once you have a suitable current context.
@code
window = glfwCreateWindow(640, 480, "My Window", NULL, NULL);
if (!window)
{
...
}
glfwMakeContextCurrent(window);
gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
@endcode
Once glad has been loaded, you have access to all OpenGL core and extension
functions supported by both the context you created and the glad loader you
generated and you are ready to start rendering.
You can specify a minimum required OpenGL or OpenGL ES version with
[context hints](@ref window_hints_ctx). If your needs are more complex, you can
check the actual OpenGL or OpenGL ES version with
[context attributes](@ref window_attribs_ctx), or you can check whether
a specific version is supported by the current context with the
`GLAD_GL_VERSION_x_x` booleans.
@code
if (GLAD_GL_VERSION_3_2)
{
// Call OpenGL 3.2+ specific code
}
@endcode
To check whether a specific extension is supported, use the `GLAD_GL_xxx`
booleans.
@code
if (GLAD_GL_ARB_gl_spirv)
{
// Use GL_ARB_gl_spirv
}
@endcode
@subsection context_glext_manual Loading extensions manually
__Do not use this technique__ unless it is absolutely necessary. An
[extension loader library](@ref context_glext_auto) will save you a ton of
tedious, repetitive, error prone work.
To use a certain extension, you must first check whether the context supports
that extension and then, if it introduces new functions, retrieve the pointers
to those functions. GLFW provides @ref glfwExtensionSupported and @ref
glfwGetProcAddress for manual loading of extensions and new API functions.
This section will demonstrate manual loading of OpenGL extensions. The loading
of OpenGL ES extensions is identical except for the name of the extension header.
@subsubsection context_glext_header The glext.h header
The `glext.h` extension header is a continually updated file that defines the
interfaces for all OpenGL extensions. The latest version of this can always be
found at the [OpenGL Registry](https://www.opengl.org/registry/). There are also
extension headers for the various versions of OpenGL ES at the
[OpenGL ES Registry](https://www.khronos.org/registry/gles/). It it strongly
recommended that you use your own copy of the extension header, as the one
included in your development environment may be several years out of date and
may not include the extensions you wish to use.
The header defines function pointer types for all functions of all extensions it
supports. These have names like `PFNGLSPECIALIZESHADERARBPROC` (for
`glSpecializeShaderARB`), i.e. the name is made uppercase and `PFN` (pointer
to function) and `PROC` (procedure) are added to the ends.
To include the extension header, define @ref GLFW_INCLUDE_GLEXT before including
the GLFW header.
@code
#define GLFW_INCLUDE_GLEXT
#include <GLFW/glfw3.h>
@endcode
@subsubsection context_glext_string Checking for extensions
A given machine may not actually support the extension (it may have older
drivers or a graphics card that lacks the necessary hardware features), so it
is necessary to check at run-time whether the context supports the extension.
This is done with @ref glfwExtensionSupported.
@code
if (glfwExtensionSupported("GL_ARB_gl_spirv"))
{
// The extension is supported by the current context
}
@endcode
The argument is a null terminated ASCII string with the extension name. If the
extension is supported, @ref glfwExtensionSupported returns `GLFW_TRUE`,
otherwise it returns `GLFW_FALSE`.
@subsubsection context_glext_proc Fetching function pointers
Many extensions, though not all, require the use of new OpenGL functions.
These functions often do not have entry points in the client API libraries of
your operating system, making it necessary to fetch them at run time. You can
retrieve pointers to these functions with @ref glfwGetProcAddress.
@code
PFNGLSPECIALIZESHADERARBPROC pfnSpecializeShaderARB = glfwGetProcAddress("glSpecializeShaderARB");
@endcode
In general, you should avoid giving the function pointer variables the (exact)
same name as the function, as this may confuse your linker. Instead, you can
use a different prefix, like above, or some other naming scheme.
Now that all the pieces have been introduced, here is what they might look like
when used together.
@code
#define GLFW_INCLUDE_GLEXT
#include <GLFW/glfw3.h>
#define glSpecializeShaderARB pfnSpecializeShaderARB
PFNGLSPECIALIZESHADERARBPROC pfnSpecializeShaderARB;
// Flag indicating whether the extension is supported
int has_ARB_gl_spirv = 0;
void load_extensions(void)
{
if (glfwExtensionSupported("GL_ARB_gl_spirv"))
{
pfnSpecializeShaderARB = (PFNGLSPECIALIZESHADERARBPROC)
glfwGetProcAddress("glSpecializeShaderARB");
has_ARB_gl_spirv = 1;
}
}
void some_function(void)
{
if (has_ARB_gl_spirv)
{
// Now the extension function can be called as usual
glSpecializeShaderARB(...);
}
}
@endcode
*/

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<address class="footer">
<p>
Last update on $date for $projectname $projectnumber
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</address>
</body>
</html>

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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<a href="https://www.glfw.org/" id="glfwhome">GLFW</a>
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<li><a href="https://www.glfw.org/download.html">Download</a></li>
<li><a href="https://www.glfw.org/community.html">Community</a></li>
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</div>
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/*!
@page input_guide Input guide
@tableofcontents
This guide introduces the input related functions of GLFW. For details on
a specific function in this category, see the @ref input. There are also guides
for the other areas of GLFW.
- @ref intro_guide
- @ref window_guide
- @ref context_guide
- @ref vulkan_guide
- @ref monitor_guide
GLFW provides many kinds of input. While some can only be polled, like time, or
only received via callbacks, like scrolling, many provide both callbacks and
polling. Callbacks are more work to use than polling but is less CPU intensive
and guarantees that you do not miss state changes.
All input callbacks receive a window handle. By using the
[window user pointer](@ref window_userptr), you can access non-global structures
or objects from your callbacks.
To get a better feel for how the various events callbacks behave, run the
`events` test program. It register every callback supported by GLFW and prints
out all arguments provided for every event, along with time and sequence
information.
@section events Event processing
GLFW needs to poll the window system for events both to provide input to the
application and to prove to the window system that the application hasn't locked
up. Event processing is normally done each frame after
[buffer swapping](@ref buffer_swap). Even when you have no windows, event
polling needs to be done in order to receive monitor and joystick connection
events.
There are three functions for processing pending events. @ref glfwPollEvents,
processes only those events that have already been received and then returns
immediately.
@code
glfwPollEvents();
@endcode
This is the best choice when rendering continuously, like most games do.
If you only need to update the contents of the window when you receive new
input, @ref glfwWaitEvents is a better choice.
@code
glfwWaitEvents();
@endcode
It puts the thread to sleep until at least one event has been received and then
processes all received events. This saves a great deal of CPU cycles and is
useful for, for example, editing tools.
If you want to wait for events but have UI elements or other tasks that need
periodic updates, @ref glfwWaitEventsTimeout lets you specify a timeout.
@code
glfwWaitEventsTimeout(0.7);
@endcode
It puts the thread to sleep until at least one event has been received, or until
the specified number of seconds have elapsed. It then processes any received
events.
If the main thread is sleeping in @ref glfwWaitEvents, you can wake it from
another thread by posting an empty event to the event queue with @ref
glfwPostEmptyEvent.
@code
glfwPostEmptyEvent();
@endcode
Do not assume that callbacks will _only_ be called in response to the above
functions. While it is necessary to process events in one or more of the ways
above, window systems that require GLFW to register callbacks of its own can
pass events to GLFW in response to many window system function calls. GLFW will
pass those events on to the application callbacks before returning.
For example, on Windows the system function that @ref glfwSetWindowSize is
implemented with will send window size events directly to the event callback
that every window has and that GLFW implements for its windows. If you have set
a [window size callback](@ref window_size) GLFW will call it in turn with the
new size before everything returns back out of the @ref glfwSetWindowSize call.
@section input_keyboard Keyboard input
GLFW divides keyboard input into two categories; key events and character
events. Key events relate to actual physical keyboard keys, whereas character
events relate to the Unicode code points generated by pressing some of them.
Keys and characters do not map 1:1. A single key press may produce several
characters, and a single character may require several keys to produce. This
may not be the case on your machine, but your users are likely not all using the
same keyboard layout, input method or even operating system as you.
@subsection input_key Key input
If you wish to be notified when a physical key is pressed or released or when it
repeats, set a key callback.
@code
glfwSetKeyCallback(window, key_callback);
@endcode
The callback function receives the [keyboard key](@ref keys), platform-specific
scancode, key action and [modifier bits](@ref mods).
@code
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_E && action == GLFW_PRESS)
activate_airship();
}
@endcode
The action is one of `GLFW_PRESS`, `GLFW_REPEAT` or `GLFW_RELEASE`. The key
will be `GLFW_KEY_UNKNOWN` if GLFW lacks a key token for it, for example
_E-mail_ and _Play_ keys.
The scancode is unique for every key, regardless of whether it has a key token.
Scancodes are platform-specific but consistent over time, so keys will have
different scancodes depending on the platform but they are safe to save to disk.
You can query the scancode for any [named key](@ref keys) on the current
platform with @ref glfwGetKeyScancode.
@code
const int scancode = glfwGetKeyScancode(GLFW_KEY_X);
set_key_mapping(scancode, swap_weapons);
@endcode
The last reported state for every [named key](@ref keys) is also saved in
per-window state arrays that can be polled with @ref glfwGetKey.
@code
int state = glfwGetKey(window, GLFW_KEY_E);
if (state == GLFW_PRESS)
{
activate_airship();
}
@endcode
The returned state is one of `GLFW_PRESS` or `GLFW_RELEASE`.
This function only returns cached key event state. It does not poll the
system for the current physical state of the key.
@anchor GLFW_STICKY_KEYS
Whenever you poll state, you risk missing the state change you are looking for.
If a pressed key is released again before you poll its state, you will have
missed the key press. The recommended solution for this is to use a
key callback, but there is also the `GLFW_STICKY_KEYS` input mode.
@code
glfwSetInputMode(window, GLFW_STICKY_KEYS, GLFW_TRUE);
@endcode
When sticky keys mode is enabled, the pollable state of a key will remain
`GLFW_PRESS` until the state of that key is polled with @ref glfwGetKey. Once
it has been polled, if a key release event had been processed in the meantime,
the state will reset to `GLFW_RELEASE`, otherwise it will remain `GLFW_PRESS`.
@anchor GLFW_LOCK_KEY_MODS
If you wish to know what the state of the Caps Lock and Num Lock keys was when
input events were generated, set the `GLFW_LOCK_KEY_MODS` input mode.
@code
glfwSetInputMode(window, GLFW_LOCK_KEY_MODS, GLFW_TRUE);
@endcode
When this input mode is enabled, any callback that receives
[modifier bits](@ref mods) will have the @ref GLFW_MOD_CAPS_LOCK bit set if Caps
Lock was on when the event occurred and the @ref GLFW_MOD_NUM_LOCK bit set if
Num Lock was on.
The `GLFW_KEY_LAST` constant holds the highest value of any
[named key](@ref keys).
@subsection input_char Text input
GLFW supports text input in the form of a stream of
[Unicode code points](https://en.wikipedia.org/wiki/Unicode), as produced by the
operating system text input system. Unlike key input, text input obeys keyboard
layouts and modifier keys and supports composing characters using
[dead keys](https://en.wikipedia.org/wiki/Dead_key). Once received, you can
encode the code points into UTF-8 or any other encoding you prefer.
Because an `unsigned int` is 32 bits long on all platforms supported by GLFW,
you can treat the code point argument as native endian UTF-32.
If you wish to offer regular text input, set a character callback.
@code
glfwSetCharCallback(window, character_callback);
@endcode
The callback function receives Unicode code points for key events that would
have led to regular text input and generally behaves as a standard text field on
that platform.
@code
void character_callback(GLFWwindow* window, unsigned int codepoint)
{
}
@endcode
@subsection input_key_name Key names
If you wish to refer to keys by name, you can query the keyboard layout
dependent name of printable keys with @ref glfwGetKeyName.
@code
const char* key_name = glfwGetKeyName(GLFW_KEY_W, 0);
show_tutorial_hint("Press %s to move forward", key_name);
@endcode
This function can handle both [keys and scancodes](@ref input_key). If the
specified key is `GLFW_KEY_UNKNOWN` then the scancode is used, otherwise it is
ignored. This matches the behavior of the key callback, meaning the callback
arguments can always be passed unmodified to this function.
@section input_mouse Mouse input
Mouse input comes in many forms, including mouse motion, button presses and
scrolling offsets. The cursor appearance can also be changed, either to
a custom image or a standard cursor shape from the system theme.
@subsection cursor_pos Cursor position
If you wish to be notified when the cursor moves over the window, set a cursor
position callback.
@code
glfwSetCursorPosCallback(window, cursor_position_callback);
@endcode
The callback functions receives the cursor position, measured in screen
coordinates but relative to the top-left corner of the window content area. On
platforms that provide it, the full sub-pixel cursor position is passed on.
@code
static void cursor_position_callback(GLFWwindow* window, double xpos, double ypos)
{
}
@endcode
The cursor position is also saved per-window and can be polled with @ref
glfwGetCursorPos.
@code
double xpos, ypos;
glfwGetCursorPos(window, &xpos, &ypos);
@endcode
@subsection cursor_mode Cursor mode
@anchor GLFW_CURSOR
The `GLFW_CURSOR` input mode provides several cursor modes for special forms of
mouse motion input. By default, the cursor mode is `GLFW_CURSOR_NORMAL`,
meaning the regular arrow cursor (or another cursor set with @ref glfwSetCursor)
is used and cursor motion is not limited.
If you wish to implement mouse motion based camera controls or other input
schemes that require unlimited mouse movement, set the cursor mode to
`GLFW_CURSOR_DISABLED`.
@code
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
@endcode
This will hide the cursor and lock it to the specified window. GLFW will then
take care of all the details of cursor re-centering and offset calculation and
providing the application with a virtual cursor position. This virtual position
is provided normally via both the cursor position callback and through polling.
@note You should not implement your own version of this functionality using
other features of GLFW. It is not supported and will not work as robustly as
`GLFW_CURSOR_DISABLED`.
If you only wish the cursor to become hidden when it is over a window but still
want it to behave normally, set the cursor mode to `GLFW_CURSOR_HIDDEN`.
@code
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
@endcode
This mode puts no limit on the motion of the cursor.
To exit out of either of these special modes, restore the `GLFW_CURSOR_NORMAL`
cursor mode.
@code
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
@endcode
@anchor GLFW_RAW_MOUSE_MOTION
@subsection raw_mouse_motion Raw mouse motion
When the cursor is disabled, raw (unscaled and unaccelerated) mouse motion can
be enabled if available.
Raw mouse motion is closer to the actual motion of the mouse across a surface.
It is not affected by the scaling and acceleration applied to the motion of the
desktop cursor. That processing is suitable for a cursor while raw motion is
better for controlling for example a 3D camera. Because of this, raw mouse
motion is only provided when the cursor is disabled.
Call @ref glfwRawMouseMotionSupported to check if the current machine provides
raw motion and set the `GLFW_RAW_MOUSE_MOTION` input mode to enable it. It is
disabled by default.
@code
if (glfwRawMouseMotionSupported())
glfwSetInputMode(window, GLFW_RAW_MOUSE_MOTION, GLFW_TRUE);
@endcode
If supported, raw mouse motion can be enabled or disabled per-window and at any
time but it will only be provided when the cursor is disabled.
@subsection cursor_object Cursor objects
GLFW supports creating both custom and system theme cursor images, encapsulated
as @ref GLFWcursor objects. They are created with @ref glfwCreateCursor or @ref
glfwCreateStandardCursor and destroyed with @ref glfwDestroyCursor, or @ref
glfwTerminate, if any remain.
@subsubsection cursor_custom Custom cursor creation
A custom cursor is created with @ref glfwCreateCursor, which returns a handle to
the created cursor object. For example, this creates a 16x16 white square
cursor with the hot-spot in the upper-left corner:
@code
unsigned char pixels[16 * 16 * 4];
memset(pixels, 0xff, sizeof(pixels));
GLFWimage image;
image.width = 16;
image.height = 16;
image.pixels = pixels;
GLFWcursor* cursor = glfwCreateCursor(&image, 0, 0);
@endcode
If cursor creation fails, `NULL` will be returned, so it is necessary to check
the return value.
The image data is 32-bit, little-endian, non-premultiplied RGBA, i.e. eight bits
per channel with the red channel first. The pixels are arranged canonically as
sequential rows, starting from the top-left corner.
@subsubsection cursor_standard Standard cursor creation
A cursor with a [standard shape](@ref shapes) from the current system cursor
theme can be can be created with @ref glfwCreateStandardCursor.
@code
GLFWcursor* cursor = glfwCreateStandardCursor(GLFW_HRESIZE_CURSOR);
@endcode
These cursor objects behave in the exact same way as those created with @ref
glfwCreateCursor except that the system cursor theme provides the actual image.
@subsubsection cursor_destruction Cursor destruction
When a cursor is no longer needed, destroy it with @ref glfwDestroyCursor.
@code
glfwDestroyCursor(cursor);
@endcode
Cursor destruction always succeeds. If the cursor is current for any window,
that window will revert to the default cursor. This does not affect the cursor
mode. All remaining cursors are destroyed when @ref glfwTerminate is called.
@subsubsection cursor_set Cursor setting
A cursor can be set as current for a window with @ref glfwSetCursor.
@code
glfwSetCursor(window, cursor);
@endcode
Once set, the cursor image will be used as long as the system cursor is over the
content area of the window and the [cursor mode](@ref cursor_mode) is set
to `GLFW_CURSOR_NORMAL`.
A single cursor may be set for any number of windows.
To revert to the default cursor, set the cursor of that window to `NULL`.
@code
glfwSetCursor(window, NULL);
@endcode
When a cursor is destroyed, any window that has it set will revert to the
default cursor. This does not affect the cursor mode.
@subsection cursor_enter Cursor enter/leave events
If you wish to be notified when the cursor enters or leaves the content area of
a window, set a cursor enter/leave callback.
@code
glfwSetCursorEnterCallback(window, cursor_enter_callback);
@endcode
The callback function receives the new classification of the cursor.
@code
void cursor_enter_callback(GLFWwindow* window, int entered)
{
if (entered)
{
// The cursor entered the content area of the window
}
else
{
// The cursor left the content area of the window
}
}
@endcode
You can query whether the cursor is currently inside the content area of the
window with the [GLFW_HOVERED](@ref GLFW_HOVERED_attrib) window attribute.
@code
if (glfwGetWindowAttrib(window, GLFW_HOVERED))
{
highlight_interface();
}
@endcode
@subsection input_mouse_button Mouse button input
If you wish to be notified when a mouse button is pressed or released, set
a mouse button callback.
@code
glfwSetMouseButtonCallback(window, mouse_button_callback);
@endcode
The callback function receives the [mouse button](@ref buttons), button action
and [modifier bits](@ref mods).
@code
void mouse_button_callback(GLFWwindow* window, int button, int action, int mods)
{
if (button == GLFW_MOUSE_BUTTON_RIGHT && action == GLFW_PRESS)
popup_menu();
}
@endcode
The action is one of `GLFW_PRESS` or `GLFW_RELEASE`.
Mouse button states for [named buttons](@ref buttons) are also saved in
per-window state arrays that can be polled with @ref glfwGetMouseButton.
@code
int state = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT);
if (state == GLFW_PRESS)
{
upgrade_cow();
}
@endcode
The returned state is one of `GLFW_PRESS` or `GLFW_RELEASE`.
This function only returns cached mouse button event state. It does not poll
the system for the current state of the mouse button.
@anchor GLFW_STICKY_MOUSE_BUTTONS
Whenever you poll state, you risk missing the state change you are looking for.
If a pressed mouse button is released again before you poll its state, you will have
missed the button press. The recommended solution for this is to use a
mouse button callback, but there is also the `GLFW_STICKY_MOUSE_BUTTONS`
input mode.
@code
glfwSetInputMode(window, GLFW_STICKY_MOUSE_BUTTONS, GLFW_TRUE);
@endcode
When sticky mouse buttons mode is enabled, the pollable state of a mouse button
will remain `GLFW_PRESS` until the state of that button is polled with @ref
glfwGetMouseButton. Once it has been polled, if a mouse button release event
had been processed in the meantime, the state will reset to `GLFW_RELEASE`,
otherwise it will remain `GLFW_PRESS`.
The `GLFW_MOUSE_BUTTON_LAST` constant holds the highest value of any
[named button](@ref buttons).
@subsection scrolling Scroll input
If you wish to be notified when the user scrolls, whether with a mouse wheel or
touchpad gesture, set a scroll callback.
@code
glfwSetScrollCallback(window, scroll_callback);
@endcode
The callback function receives two-dimensional scroll offsets.
@code
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
}
@endcode
A normal mouse wheel, being vertical, provides offsets along the Y-axis.
@section joystick Joystick input
The joystick functions expose connected joysticks and controllers, with both
referred to as joysticks. It supports up to sixteen joysticks, ranging from
`GLFW_JOYSTICK_1`, `GLFW_JOYSTICK_2` up to and including `GLFW_JOYSTICK_16` or
`GLFW_JOYSTICK_LAST`. You can test whether a [joystick](@ref joysticks) is
present with @ref glfwJoystickPresent.
@code
int present = glfwJoystickPresent(GLFW_JOYSTICK_1);
@endcode
Each joystick has zero or more axes, zero or more buttons, zero or more hats,
a human-readable name, a user pointer and an SDL compatible GUID.
When GLFW is initialized, detected joysticks are added to the beginning of
the array. Once a joystick is detected, it keeps its assigned ID until it is
disconnected or the library is terminated, so as joysticks are connected and
disconnected, there may appear gaps in the IDs.
Joystick axis, button and hat state is updated when polled and does not require
a window to be created or events to be processed. However, if you want joystick
connection and disconnection events reliably delivered to the
[joystick callback](@ref joystick_event) then you must
[process events](@ref events).
To see all the properties of all connected joysticks in real-time, run the
`joysticks` test program.
@subsection joystick_axis Joystick axis states
The positions of all axes of a joystick are returned by @ref
glfwGetJoystickAxes. See the reference documentation for the lifetime of the
returned array.
@code
int count;
const float* axes = glfwGetJoystickAxes(GLFW_JOYSTICK_5, &count);
@endcode
Each element in the returned array is a value between -1.0 and 1.0.
@subsection joystick_button Joystick button states
The states of all buttons of a joystick are returned by @ref
glfwGetJoystickButtons. See the reference documentation for the lifetime of the
returned array.
@code
int count;
const unsigned char* buttons = glfwGetJoystickButtons(GLFW_JOYSTICK_3, &count);
@endcode
Each element in the returned array is either `GLFW_PRESS` or `GLFW_RELEASE`.
For backward compatibility with earlier versions that did not have @ref
glfwGetJoystickHats, the button array by default also includes all hats. See
the reference documentation for @ref glfwGetJoystickButtons for details.
@subsection joystick_hat Joystick hat states
The states of all hats are returned by @ref glfwGetJoystickHats. See the
reference documentation for the lifetime of the returned array.
@code
int count;
const unsigned char* hats = glfwGetJoystickHats(GLFW_JOYSTICK_7, &count);
@endcode
Each element in the returned array is one of the following:
Name | Value
---- | -----
`GLFW_HAT_CENTERED` | 0
`GLFW_HAT_UP` | 1
`GLFW_HAT_RIGHT` | 2
`GLFW_HAT_DOWN` | 4
`GLFW_HAT_LEFT` | 8
`GLFW_HAT_RIGHT_UP` | `GLFW_HAT_RIGHT` \| `GLFW_HAT_UP`
`GLFW_HAT_RIGHT_DOWN` | `GLFW_HAT_RIGHT` \| `GLFW_HAT_DOWN`
`GLFW_HAT_LEFT_UP` | `GLFW_HAT_LEFT` \| `GLFW_HAT_UP`
`GLFW_HAT_LEFT_DOWN` | `GLFW_HAT_LEFT` \| `GLFW_HAT_DOWN`
The diagonal directions are bitwise combinations of the primary (up, right, down
and left) directions and you can test for these individually by ANDing it with
the corresponding direction.
@code
if (hats[2] & GLFW_HAT_RIGHT)
{
// State of hat 2 could be right-up, right or right-down
}
@endcode
For backward compatibility with earlier versions that did not have @ref
glfwGetJoystickHats, all hats are by default also included in the button array.
See the reference documentation for @ref glfwGetJoystickButtons for details.
@subsection joystick_name Joystick name
The human-readable, UTF-8 encoded name of a joystick is returned by @ref
glfwGetJoystickName. See the reference documentation for the lifetime of the
returned string.
@code
const char* name = glfwGetJoystickName(GLFW_JOYSTICK_4);
@endcode
Joystick names are not guaranteed to be unique. Two joysticks of the same model
and make may have the same name. Only the [joystick ID](@ref joysticks) is
guaranteed to be unique, and only until that joystick is disconnected.
@subsection joystick_userptr Joystick user pointer
Each joystick has a user pointer that can be set with @ref
glfwSetJoystickUserPointer and queried with @ref glfwGetJoystickUserPointer.
This can be used for any purpose you need and will not be modified by GLFW. The
value will be kept until the joystick is disconnected or until the library is
terminated.
The initial value of the pointer is `NULL`.
@subsection joystick_event Joystick configuration changes
If you wish to be notified when a joystick is connected or disconnected, set
a joystick callback.
@code
glfwSetJoystickCallback(joystick_callback);
@endcode
The callback function receives the ID of the joystick that has been connected
and disconnected and the event that occurred.
@code
void joystick_callback(int jid, int event)
{
if (event == GLFW_CONNECTED)
{
// The joystick was connected
}
else if (event == GLFW_DISCONNECTED)
{
// The joystick was disconnected
}
}
@endcode
For joystick connection and disconnection events to be delivered on all
platforms, you need to call one of the [event processing](@ref events)
functions. Joystick disconnection may also be detected and the callback
called by joystick functions. The function will then return whatever it
returns for a disconnected joystick.
Only @ref glfwGetJoystickName and @ref glfwGetJoystickUserPointer will return
useful values for a disconnected joystick and only before the monitor callback
returns.
@subsection gamepad Gamepad input
The joystick functions provide unlabeled axes, buttons and hats, with no
indication of where they are located on the device. Their order may also vary
between platforms even with the same device.
To solve this problem the SDL community crowdsourced the
[SDL_GameControllerDB](https://github.com/gabomdq/SDL_GameControllerDB) project,
a database of mappings from many different devices to an Xbox-like gamepad.
GLFW supports this mapping format and contains a copy of the mappings
available at the time of release. See @ref gamepad_mapping for how to update
this at runtime. Mappings will be assigned to joysticks automatically any time
a joystick is connected or the mappings are updated.
You can check whether a joystick is both present and has a gamepad mapping with
@ref glfwJoystickIsGamepad.
@code
if (glfwJoystickIsGamepad(GLFW_JOYSTICK_2))
{
// Use as gamepad
}
@endcode
If you are only interested in gamepad input you can use this function instead of
@ref glfwJoystickPresent.
You can query the human-readable name provided by the gamepad mapping with @ref
glfwGetGamepadName. This may or may not be the same as the
[joystick name](@ref joystick_name).
@code
const char* name = glfwGetGamepadName(GLFW_JOYSTICK_7);
@endcode
To retrieve the gamepad state of a joystick, call @ref glfwGetGamepadState.
@code
GLFWgamepadstate state;
if (glfwGetGamepadState(GLFW_JOYSTICK_3, &state))
{
if (state.buttons[GLFW_GAMEPAD_BUTTON_A])
{
input_jump();
}
input_speed(state.axes[GLFW_GAMEPAD_AXIS_RIGHT_TRIGGER]);
}
@endcode
The @ref GLFWgamepadstate struct has two arrays; one for button states and one
for axis states. The values for each button and axis are the same as for the
@ref glfwGetJoystickButtons and @ref glfwGetJoystickAxes functions, i.e.
`GLFW_PRESS` or `GLFW_RELEASE` for buttons and -1.0 to 1.0 inclusive for axes.
The sizes of the arrays and the positions within each array are fixed.
The [button indices](@ref gamepad_buttons) are `GLFW_GAMEPAD_BUTTON_A`,
`GLFW_GAMEPAD_BUTTON_B`, `GLFW_GAMEPAD_BUTTON_X`, `GLFW_GAMEPAD_BUTTON_Y`,
`GLFW_GAMEPAD_BUTTON_LEFT_BUMPER`, `GLFW_GAMEPAD_BUTTON_RIGHT_BUMPER`,
`GLFW_GAMEPAD_BUTTON_BACK`, `GLFW_GAMEPAD_BUTTON_START`,
`GLFW_GAMEPAD_BUTTON_GUIDE`, `GLFW_GAMEPAD_BUTTON_LEFT_THUMB`,
`GLFW_GAMEPAD_BUTTON_RIGHT_THUMB`, `GLFW_GAMEPAD_BUTTON_DPAD_UP`,
`GLFW_GAMEPAD_BUTTON_DPAD_RIGHT`, `GLFW_GAMEPAD_BUTTON_DPAD_DOWN` and
`GLFW_GAMEPAD_BUTTON_DPAD_LEFT`.
For those who prefer, there are also the `GLFW_GAMEPAD_BUTTON_CROSS`,
`GLFW_GAMEPAD_BUTTON_CIRCLE`, `GLFW_GAMEPAD_BUTTON_SQUARE` and
`GLFW_GAMEPAD_BUTTON_TRIANGLE` aliases for the A, B, X and Y button indices.
The [axis indices](@ref gamepad_axes) are `GLFW_GAMEPAD_AXIS_LEFT_X`,
`GLFW_GAMEPAD_AXIS_LEFT_Y`, `GLFW_GAMEPAD_AXIS_RIGHT_X`,
`GLFW_GAMEPAD_AXIS_RIGHT_Y`, `GLFW_GAMEPAD_AXIS_LEFT_TRIGGER` and
`GLFW_GAMEPAD_AXIS_RIGHT_TRIGGER`.
The `GLFW_GAMEPAD_BUTTON_LAST` and `GLFW_GAMEPAD_AXIS_LAST` constants equal
the largest available index for each array.
@subsection gamepad_mapping Gamepad mappings
GLFW contains a copy of the mappings available in
[SDL_GameControllerDB](https://github.com/gabomdq/SDL_GameControllerDB) at the
time of release. Newer ones can be added at runtime with @ref
glfwUpdateGamepadMappings.
@code
const char* mappings = load_file_contents("game/data/gamecontrollerdb.txt");
glfwUpdateGamepadMappings(mappings);
@endcode
This function supports everything from single lines up to and including the
unmodified contents of the whole `gamecontrollerdb.txt` file.
If you are compiling GLFW from source with CMake you can update the built-in mappings by
building the _update_mappings_ target. This runs the `GenerateMappings.cmake` CMake
script, which downloads `gamecontrollerdb.txt` and regenerates the `mappings.h` header
file.
Below is a description of the mapping format. Please keep in mind that __this
description is not authoritative__. The format is defined by the SDL and
SDL_GameControllerDB projects and their documentation and code takes precedence.
Each mapping is a single line of comma-separated values describing the GUID,
name and layout of the gamepad. Lines that do not begin with a hexadecimal
digit are ignored.
The first value is always the gamepad GUID, a 32 character long hexadecimal
string that typically identifies its make, model, revision and the type of
connection to the computer. When this information is not available, the GUID is
generated using the gamepad name. GLFW uses the SDL 2.0.5+ GUID format but can
convert from the older formats.
The second value is always the human-readable name of the gamepad.
All subsequent values are in the form `<field>:<value>` and describe the layout
of the mapping. These fields may not all be present and may occur in any order.
The button fields are `a`, `b`, `c`, `d`, `back`, `start`, `guide`, `dpup`,
`dpright`, `dpdown`, `dpleft`, `leftshoulder`, `rightshoulder`, `leftstick` and
`rightstick`.
The axis fields are `leftx`, `lefty`, `rightx`, `righty`, `lefttrigger` and
`righttrigger`.
The value of an axis or button field can be a joystick button, a joystick axis,
a hat bitmask or empty. Joystick buttons are specified as `bN`, for example
`b2` for the third button. Joystick axes are specified as `aN`, for example
`a7` for the eighth button. Joystick hat bit masks are specified as `hN.N`, for
example `h0.8` for left on the first hat. More than one bit may be set in the
mask.
Before an axis there may be a `+` or `-` range modifier, for example `+a3` for
the positive half of the fourth axis. This restricts input to only the positive
or negative halves of the joystick axis. After an axis or half-axis there may
be the `~` inversion modifier, for example `a2~` or `-a7~`. This negates the
values of the gamepad axis.
The hat bit mask match the [hat states](@ref hat_state) in the joystick
functions.
There is also the special `platform` field that specifies which platform the
mapping is valid for. Possible values are `Windows`, `Mac OS X` and `Linux`.
Below is an example of what a gamepad mapping might look like. It is the
one built into GLFW for Xbox controllers accessed via the XInput API on Windows.
This example has been broken into several lines to fit on the page, but real
gamepad mappings must be a single line.
@code{.unparsed}
78696e70757401000000000000000000,XInput Gamepad (GLFW),platform:Windows,a:b0,
b:b1,x:b2,y:b3,leftshoulder:b4,rightshoulder:b5,back:b6,start:b7,leftstick:b8,
rightstick:b9,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:a4,
righttrigger:a5,dpup:h0.1,dpright:h0.2,dpdown:h0.4,dpleft:h0.8,
@endcode
@note GLFW does not yet support the output range and modifiers `+` and `-` that
were recently added to SDL. The input modifiers `+`, `-` and `~` are supported
and described above.
@section time Time input
GLFW provides high-resolution time input, in seconds, with @ref glfwGetTime.
@code
double seconds = glfwGetTime();
@endcode
It returns the number of seconds since the library was initialized with @ref
glfwInit. The platform-specific time sources used typically have micro- or
nanosecond resolution.
You can modify the base time with @ref glfwSetTime.
@code
glfwSetTime(4.0);
@endcode
This sets the time to the specified time, in seconds, and it continues to count
from there.
You can also access the raw timer used to implement the functions above,
with @ref glfwGetTimerValue.
@code
uint64_t value = glfwGetTimerValue();
@endcode
This value is in 1&nbsp;/&nbsp;frequency seconds. The frequency of the raw
timer varies depending on the operating system and hardware. You can query the
frequency, in Hz, with @ref glfwGetTimerFrequency.
@code
uint64_t frequency = glfwGetTimerFrequency();
@endcode
@section clipboard Clipboard input and output
If the system clipboard contains a UTF-8 encoded string or if it can be
converted to one, you can retrieve it with @ref glfwGetClipboardString. See the
reference documentation for the lifetime of the returned string.
@code
const char* text = glfwGetClipboardString(NULL);
if (text)
{
insert_text(text);
}
@endcode
If the clipboard is empty or if its contents could not be converted, `NULL` is
returned.
The contents of the system clipboard can be set to a UTF-8 encoded string with
@ref glfwSetClipboardString.
@code
glfwSetClipboardString(NULL, "A string with words in it");
@endcode
@section path_drop Path drop input
If you wish to receive the paths of files and/or directories dropped on
a window, set a file drop callback.
@code
glfwSetDropCallback(window, drop_callback);
@endcode
The callback function receives an array of paths encoded as UTF-8.
@code
void drop_callback(GLFWwindow* window, int count, const char** paths)
{
int i;
for (i = 0; i < count; i++)
handle_dropped_file(paths[i]);
}
@endcode
The path array and its strings are only valid until the file drop callback
returns, as they may have been generated specifically for that event. You need
to make a deep copy of the array if you want to keep the paths.
*/

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/*!
@page internals_guide Internal structure
@tableofcontents
There are several interfaces inside GLFW. Each interface has its own area of
responsibility and its own naming conventions.
@section internals_public Public interface
The most well-known is the public interface, described in the glfw3.h header
file. This is implemented in source files shared by all platforms and these
files contain no platform-specific code. This code usually ends up calling the
platform and internal interfaces to do the actual work.
The public interface uses the OpenGL naming conventions except with GLFW and
glfw instead of GL and gl. For struct members, where OpenGL sets no precedent,
it use headless camel case.
Examples: `glfwCreateWindow`, `GLFWwindow`, `GLFW_RED_BITS`
@section internals_native Native interface
The [native interface](@ref native) is a small set of publicly available
but platform-specific functions, described in the glfw3native.h header file and
used to gain access to the underlying window, context and (on some platforms)
display handles used by the platform interface.
The function names of the native interface are similar to those of the public
interface, but embeds the name of the interface that the returned handle is
from.
Examples: `glfwGetX11Window`, `glfwGetWGLContext`
@section internals_internal Internal interface
The internal interface consists of utility functions used by all other
interfaces. It is shared code implemented in the same shared source files as
the public and event interfaces. The internal interface is described in the
internal.h header file.
The internal interface is in charge of GLFW's global data, which it stores in
a `_GLFWlibrary` struct named `_glfw`.
The internal interface uses the same style as the public interface, except all
global names have a leading underscore.
Examples: `_glfwIsValidContextConfig`, `_GLFWwindow`, `_glfw.monitorCount`
@section internals_platform Platform interface
The platform interface implements all platform-specific operations as a service
to the public interface. This includes event processing. The platform
interface is never directly called by application code and never directly calls
application-provided callbacks. It is also prohibited from modifying the
platform-independent part of the internal structs. Instead, it calls the event
interface when events interesting to GLFW are received.
The platform interface mirrors those parts of the public interface that needs to
perform platform-specific operations on some or all platforms. The are also
named the same except that the glfw function prefix is replaced by
_glfwPlatform.
Examples: `_glfwPlatformCreateWindow`
The platform interface also defines structs that contain platform-specific
global and per-object state. Their names mirror those of the internal
interface, except that an interface-specific suffix is added.
Examples: `_GLFWwindowX11`, `_GLFWcontextWGL`
These structs are incorporated as members into the internal interface structs
using special macros that name them after the specific interface used. This
prevents shared code from accidentally using these members.
Examples: `window->win32.handle`, `_glfw.x11.display`
@section internals_event Event interface
The event interface is implemented in the same shared source files as the public
interface and is responsible for delivering the events it receives to the
application, either via callbacks, via window state changes or both.
The function names of the event interface use a `_glfwInput` prefix and the
ObjectEvent pattern.
Examples: `_glfwInputWindowFocus`, `_glfwInputCursorPos`
@section internals_static Static functions
Static functions may be used by any interface and have no prefixes or suffixes.
These use headless camel case.
Examples: `isValidElementForJoystick`
@section internals_config Configuration macros
GLFW uses a number of configuration macros to select at compile time which
interfaces and code paths to use. They are defined in the glfw_config.h header file,
which is generated from the `glfw_config.h.in` file by CMake.
Configuration macros the same style as tokens in the public interface, except
with a leading underscore.
Examples: `_GLFW_WIN32`, `_GLFW_BUILD_DLL`
*/

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/*!
@page intro_guide Introduction to the API
@tableofcontents
This guide introduces the basic concepts of GLFW and describes initialization,
error handling and API guarantees and limitations. For a broad but shallow
tutorial, see @ref quick_guide instead. For details on a specific function in
this category, see the @ref init.
There are also guides for the other areas of GLFW.
- @ref window_guide
- @ref context_guide
- @ref vulkan_guide
- @ref monitor_guide
- @ref input_guide
@section intro_init Initialization and termination
Before most GLFW functions may be called, the library must be initialized.
This initialization checks what features are available on the machine,
enumerates monitors and joysticks, initializes the timer and performs any
required platform-specific initialization.
Only the following functions may be called before the library has been
successfully initialized, and only from the main thread.
- @ref glfwGetVersion
- @ref glfwGetVersionString
- @ref glfwGetError
- @ref glfwSetErrorCallback
- @ref glfwInitHint
- @ref glfwInit
- @ref glfwTerminate
Calling any other function before successful initialization will cause a @ref
GLFW_NOT_INITIALIZED error.
@subsection intro_init_init Initializing GLFW
The library is initialized with @ref glfwInit, which returns `GLFW_FALSE` if an
error occurred.
@code
if (!glfwInit())
{
// Handle initialization failure
}
@endcode
If any part of initialization fails, any parts that succeeded are terminated as
if @ref glfwTerminate had been called. The library only needs to be initialized
once and additional calls to an already initialized library will return
`GLFW_TRUE` immediately.
Once the library has been successfully initialized, it should be terminated
before the application exits. Modern systems are very good at freeing resources
allocated by programs that exit, but GLFW sometimes has to change global system
settings and these might not be restored without termination.
@subsection init_hints Initialization hints
Initialization hints are set before @ref glfwInit and affect how the library
behaves until termination. Hints are set with @ref glfwInitHint.
@code
glfwInitHint(GLFW_JOYSTICK_HAT_BUTTONS, GLFW_FALSE);
@endcode
The values you set hints to are never reset by GLFW, but they only take effect
during initialization. Once GLFW has been initialized, any values you set will
be ignored until the library is terminated and initialized again.
Some hints are platform specific. These may be set on any platform but they
will only affect their specific platform. Other platforms will ignore them.
Setting these hints requires no platform specific headers or functions.
@subsubsection init_hints_shared Shared init hints
@anchor GLFW_JOYSTICK_HAT_BUTTONS
__GLFW_JOYSTICK_HAT_BUTTONS__ specifies whether to also expose joystick hats as
buttons, for compatibility with earlier versions of GLFW that did not have @ref
glfwGetJoystickHats. Possible values are `GLFW_TRUE` and `GLFW_FALSE`.
@subsubsection init_hints_osx macOS specific init hints
@anchor GLFW_COCOA_CHDIR_RESOURCES_hint
__GLFW_COCOA_CHDIR_RESOURCES__ specifies whether to set the current directory to
the application to the `Contents/Resources` subdirectory of the application's
bundle, if present. Set this with @ref glfwInitHint.
@anchor GLFW_COCOA_MENUBAR_hint
__GLFW_COCOA_MENUBAR__ specifies whether to create a basic menu bar, either from
a nib or manually, when the first window is created, which is when AppKit is
initialized. Set this with @ref glfwInitHint.
@subsubsection init_hints_values Supported and default values
Initialization hint | Default value | Supported values
------------------------------- | ------------- | ----------------
@ref GLFW_JOYSTICK_HAT_BUTTONS | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
@ref GLFW_COCOA_CHDIR_RESOURCES | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
@ref GLFW_COCOA_MENUBAR | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
@subsection intro_init_terminate Terminating GLFW
Before your application exits, you should terminate the GLFW library if it has
been initialized. This is done with @ref glfwTerminate.
@code
glfwTerminate();
@endcode
This will destroy any remaining window, monitor and cursor objects, restore any
modified gamma ramps, re-enable the screensaver if it had been disabled and free
any other resources allocated by GLFW.
Once the library is terminated, it is as if it had never been initialized and
you will need to initialize it again before being able to use GLFW. If the
library was not initialized or had already been terminated, it return
immediately.
@section error_handling Error handling
Some GLFW functions have return values that indicate an error, but this is often
not very helpful when trying to figure out what happened or why it occurred.
Other functions have no return value reserved for errors, so error notification
needs a separate channel. Finally, far from all GLFW functions have return
values.
The last [error code](@ref errors) for the calling thread can be queried at any
time with @ref glfwGetError.
@code
int code = glfwGetError(NULL);
if (code != GLFW_NO_ERROR)
handle_error(code);
@endcode
If no error has occurred since the last call, @ref GLFW_NO_ERROR (zero) is
returned. The error is cleared before the function returns.
The error code indicates the general category of the error. Some error codes,
such as @ref GLFW_NOT_INITIALIZED has only a single meaning, whereas others like
@ref GLFW_PLATFORM_ERROR are used for many different errors.
GLFW often has more information about an error than its general category. You
can retrieve a UTF-8 encoded human-readable description along with the error
code. If no error has occurred since the last call, the description is set to
`NULL`.
@code
const char* description;
int code = glfwGetError(&description);
if (description)
display_error_message(code, description);
@endcode
The retrieved description string is only valid until the next error occurs.
This means you must make a copy of it if you want to keep it.
You can also set an error callback, which will be called each time an error
occurs. It is set with @ref glfwSetErrorCallback.
@code
glfwSetErrorCallback(error_callback);
@endcode
The error callback receives the same error code and human-readable description
returned by @ref glfwGetError.
@code
void error_callback(int code, const char* description)
{
display_error_message(code, description);
}
@endcode
The error callback is called after the error is stored, so calling @ref
glfwGetError from within the error callback returns the same values as the
callback argument.
The description string passed to the callback is only valid until the error
callback returns. This means you must make a copy of it if you want to keep it.
__Reported errors are never fatal.__ As long as GLFW was successfully
initialized, it will remain initialized and in a safe state until terminated
regardless of how many errors occur. If an error occurs during initialization
that causes @ref glfwInit to fail, any part of the library that was initialized
will be safely terminated.
Do not rely on a currently invalid call to generate a specific error, as in the
future that same call may generate a different error or become valid.
@section coordinate_systems Coordinate systems
GLFW has two primary coordinate systems: the _virtual screen_ and the window
_content area_ or _content area_. Both use the same unit: _virtual screen
coordinates_, or just _screen coordinates_, which don't necessarily correspond
to pixels.
<img src="spaces.svg" width="90%" />
Both the virtual screen and the content area coordinate systems have the X-axis
pointing to the right and the Y-axis pointing down.
Window and monitor positions are specified as the position of the upper-left
corners of their content areas relative to the virtual screen, while cursor
positions are specified relative to a window's content area.
Because the origin of the window's content area coordinate system is also the
point from which the window position is specified, you can translate content
area coordinates to the virtual screen by adding the window position. The
window frame, when present, extends out from the content area but does not
affect the window position.
Almost all positions and sizes in GLFW are measured in screen coordinates
relative to one of the two origins above. This includes cursor positions,
window positions and sizes, window frame sizes, monitor positions and video mode
resolutions.
Two exceptions are the [monitor physical size](@ref monitor_size), which is
measured in millimetres, and [framebuffer size](@ref window_fbsize), which is
measured in pixels.
Pixels and screen coordinates may map 1:1 on your machine, but they won't on
every other machine, for example on a Mac with a Retina display. The ratio
between screen coordinates and pixels may also change at run-time depending on
which monitor the window is currently considered to be on.
@section guarantees_limitations Guarantees and limitations
This section describes the conditions under which GLFW can be expected to
function, barring bugs in the operating system or drivers. Use of GLFW outside
of these limits may work on some platforms, or on some machines, or some of the
time, or on some versions of GLFW, but it may break at any time and this will
not be considered a bug.
@subsection lifetime Pointer lifetimes
GLFW will never free any pointer you provide to it and you must never free any
pointer it provides to you.
Many GLFW functions return pointers to dynamically allocated structures, strings
or arrays, and some callbacks are provided with strings or arrays. These are
always managed by GLFW and should never be freed by the application. The
lifetime of these pointers is documented for each GLFW function and callback.
If you need to keep this data, you must copy it before its lifetime expires.
Many GLFW functions accept pointers to structures or strings allocated by the
application. These are never freed by GLFW and are always the responsibility of
the application. If GLFW needs to keep the data in these structures or strings,
it is copied before the function returns.
Pointer lifetimes are guaranteed not to be shortened in future minor or patch
releases.
@subsection reentrancy Reentrancy
GLFW event processing and object destruction are not reentrant. This means that
the following functions must not be called from any callback function:
- @ref glfwDestroyWindow
- @ref glfwDestroyCursor
- @ref glfwPollEvents
- @ref glfwWaitEvents
- @ref glfwWaitEventsTimeout
- @ref glfwTerminate
These functions may be made reentrant in future minor or patch releases, but
functions not on this list will not be made non-reentrant.
@subsection thread_safety Thread safety
Most GLFW functions must only be called from the main thread (the thread that
calls main), but some may be called from any thread once the library has been
initialized. Before initialization the whole library is thread-unsafe.
The reference documentation for every GLFW function states whether it is limited
to the main thread.
Initialization, termination, event processing and the creation and
destruction of windows, cursors and OpenGL and OpenGL ES contexts are all
restricted to the main thread due to limitations of one or several platforms.
Because event processing must be performed on the main thread, all callbacks
except for the error callback will only be called on that thread. The error
callback may be called on any thread, as any GLFW function may generate errors.
The error code and description may be queried from any thread.
- @ref glfwGetError
Empty events may be posted from any thread.
- @ref glfwPostEmptyEvent
The window user pointer and close flag may be read and written from any thread,
but this is not synchronized by GLFW.
- @ref glfwGetWindowUserPointer
- @ref glfwSetWindowUserPointer
- @ref glfwWindowShouldClose
- @ref glfwSetWindowShouldClose
These functions for working with OpenGL and OpenGL ES contexts may be called
from any thread, but the window object is not synchronized by GLFW.
- @ref glfwMakeContextCurrent
- @ref glfwGetCurrentContext
- @ref glfwSwapBuffers
- @ref glfwSwapInterval
- @ref glfwExtensionSupported
- @ref glfwGetProcAddress
The raw timer functions may be called from any thread.
- @ref glfwGetTimerFrequency
- @ref glfwGetTimerValue
The regular timer may be used from any thread, but reading and writing the timer
offset is not synchronized by GLFW.
- @ref glfwGetTime
- @ref glfwSetTime
Library version information may be queried from any thread.
- @ref glfwGetVersion
- @ref glfwGetVersionString
All Vulkan related functions may be called from any thread.
- @ref glfwVulkanSupported
- @ref glfwGetRequiredInstanceExtensions
- @ref glfwGetInstanceProcAddress
- @ref glfwGetPhysicalDevicePresentationSupport
- @ref glfwCreateWindowSurface
GLFW uses synchronization objects internally only to manage the per-thread
context and error states. Additional synchronization is left to the
application.
Functions that may currently be called from any thread will always remain so,
but functions that are currently limited to the main thread may be updated to
allow calls from any thread in future releases.
@subsection compatibility Version compatibility
GLFW uses [Semantic Versioning](https://semver.org/). This guarantees source
and binary backward compatibility with earlier minor versions of the API. This
means that you can drop in a newer version of the library and existing programs
will continue to compile and existing binaries will continue to run.
Once a function or constant has been added, the signature of that function or
value of that constant will remain unchanged until the next major version of
GLFW. No compatibility of any kind is guaranteed between major versions.
Undocumented behavior, i.e. behavior that is not described in the documentation,
may change at any time until it is documented.
If the reference documentation and the implementation differ, the reference
documentation will almost always take precedence and the implementation will be
fixed in the next release. The reference documentation will also take
precedence over anything stated in a guide.
@subsection event_order Event order
The order of arrival of related events is not guaranteed to be consistent
across platforms. The exception is synthetic key and mouse button release
events, which are always delivered after the window defocus event.
@section intro_version Version management
GLFW provides mechanisms for identifying what version of GLFW your application
was compiled against as well as what version it is currently running against.
If you are loading GLFW dynamically (not just linking dynamically), you can use
this to verify that the library binary is compatible with your application.
@subsection intro_version_compile Compile-time version
The compile-time version of GLFW is provided by the GLFW header with the
`GLFW_VERSION_MAJOR`, `GLFW_VERSION_MINOR` and `GLFW_VERSION_REVISION` macros.
@code
printf("Compiled against GLFW %i.%i.%i\n",
GLFW_VERSION_MAJOR,
GLFW_VERSION_MINOR,
GLFW_VERSION_REVISION);
@endcode
@subsection intro_version_runtime Run-time version
The run-time version can be retrieved with @ref glfwGetVersion, a function that
may be called regardless of whether GLFW is initialized.
@code
int major, minor, revision;
glfwGetVersion(&major, &minor, &revision);
printf("Running against GLFW %i.%i.%i\n", major, minor, revision);
@endcode
@subsection intro_version_string Version string
GLFW 3 also provides a compile-time generated version string that describes the
version, platform, compiler and any platform-specific compile-time options.
This is primarily intended for submitting bug reports, to allow developers to
see which code paths are enabled in a binary.
The version string is returned by @ref glfwGetVersionString, a function that may
be called regardless of whether GLFW is initialized.
__Do not use the version string__ to parse the GLFW library version. The @ref
glfwGetVersion function already provides the version of the running library
binary.
The format of the string is as follows:
- The version of GLFW
- The name of the window system API
- The name of the context creation API
- Any additional options or APIs
For example, when compiling GLFW 3.0 with MinGW using the Win32 and WGL
back ends, the version string may look something like this:
@code
3.0.0 Win32 WGL MinGW
@endcode
*/

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/*!
@mainpage notitle
@section main_intro Introduction
GLFW is a free, Open Source, multi-platform library for OpenGL, OpenGL ES and
Vulkan application development. It provides a simple, platform-independent API
for creating windows, contexts and surfaces, reading input, handling events, etc.
@ref news_33 list new features, caveats and deprecations.
@ref quick_guide is a guide for users new to GLFW. It takes you through how to
write a small but complete program.
There are guides for each section of the API:
- @ref intro_guide – initialization, error handling and high-level design
- @ref window_guide – creating and working with windows and framebuffers
- @ref context_guide – working with OpenGL and OpenGL ES contexts
- @ref vulkan_guide - working with Vulkan objects and extensions
- @ref monitor_guide – enumerating and working with monitors and video modes
- @ref input_guide – receiving events, polling and processing input
Once you have written a program, see @ref compile_guide and @ref build_guide.
The [reference documentation](modules.html) provides more detailed information
about specific functions.
@ref moving_guide explains what has changed and how to update existing code to
use the new API.
There is a section on @ref guarantees_limitations for pointer lifetimes,
reentrancy, thread safety, event order and backward and forward compatibility.
The [FAQ](https://www.glfw.org/faq.html) answers many common questions about the
design, implementation and use of GLFW.
Finally, @ref compat_guide explains what APIs, standards and protocols GLFW uses
and what happens when they are not present on a given machine.
This documentation was generated with Doxygen. The sources for it are available
in both the [source distribution](https://www.glfw.org/download.html) and
[GitHub repository](https://github.com/glfw/glfw).
*/

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/*!
@page monitor_guide Monitor guide
@tableofcontents
This guide introduces the monitor related functions of GLFW. For details on
a specific function in this category, see the @ref monitor. There are also
guides for the other areas of GLFW.
- @ref intro_guide
- @ref window_guide
- @ref context_guide
- @ref vulkan_guide
- @ref input_guide
@section monitor_object Monitor objects
A monitor object represents a currently connected monitor and is represented as
a pointer to the [opaque](https://en.wikipedia.org/wiki/Opaque_data_type) type
@ref GLFWmonitor. Monitor objects cannot be created or destroyed by the
application and retain their addresses until the monitors they represent are
disconnected or until the library is [terminated](@ref intro_init_terminate).
Each monitor has a current video mode, a list of supported video modes,
a virtual position, a human-readable name, an estimated physical size and
a gamma ramp. One of the monitors is the primary monitor.
The virtual position of a monitor is in
[screen coordinates](@ref coordinate_systems) and, together with the current
video mode, describes the viewports that the connected monitors provide into the
virtual desktop that spans them.
To see how GLFW views your monitor setup and its available video modes, run the
`monitors` test program.
@subsection monitor_monitors Retrieving monitors
The primary monitor is returned by @ref glfwGetPrimaryMonitor. It is the user's
preferred monitor and is usually the one with global UI elements like task bar
or menu bar.
@code
GLFWmonitor* primary = glfwGetPrimaryMonitor();
@endcode
You can retrieve all currently connected monitors with @ref glfwGetMonitors.
See the reference documentation for the lifetime of the returned array.
@code
int count;
GLFWmonitor** monitors = glfwGetMonitors(&count);
@endcode
The primary monitor is always the first monitor in the returned array, but other
monitors may be moved to a different index when a monitor is connected or
disconnected.
@subsection monitor_event Monitor configuration changes
If you wish to be notified when a monitor is connected or disconnected, set
a monitor callback.
@code
glfwSetMonitorCallback(monitor_callback);
@endcode
The callback function receives the handle for the monitor that has been
connected or disconnected and the event that occurred.
@code
void monitor_callback(GLFWmonitor* monitor, int event)
{
if (event == GLFW_CONNECTED)
{
// The monitor was connected
}
else if (event == GLFW_DISCONNECTED)
{
// The monitor was disconnected
}
}
@endcode
If a monitor is disconnected, all windows that are full screen on it will be
switched to windowed mode before the callback is called. Only @ref
glfwGetMonitorName and @ref glfwGetMonitorUserPointer will return useful values
for a disconnected monitor and only before the monitor callback returns.
@section monitor_properties Monitor properties
Each monitor has a current video mode, a list of supported video modes,
a virtual position, a content scale, a human-readable name, a user pointer, an
estimated physical size and a gamma ramp.
@subsection monitor_modes Video modes
GLFW generally does a good job selecting a suitable video mode when you create
a full screen window, change its video mode or make a windowed one full
screen, but it is sometimes useful to know exactly which video modes are
supported.
Video modes are represented as @ref GLFWvidmode structures. You can get an
array of the video modes supported by a monitor with @ref glfwGetVideoModes.
See the reference documentation for the lifetime of the returned array.
@code
int count;
GLFWvidmode* modes = glfwGetVideoModes(monitor, &count);
@endcode
To get the current video mode of a monitor call @ref glfwGetVideoMode. See the
reference documentation for the lifetime of the returned pointer.
@code
const GLFWvidmode* mode = glfwGetVideoMode(monitor);
@endcode
The resolution of a video mode is specified in
[screen coordinates](@ref coordinate_systems), not pixels.
@subsection monitor_size Physical size
The physical size of a monitor in millimetres, or an estimation of it, can be
retrieved with @ref glfwGetMonitorPhysicalSize. This has no relation to its
current _resolution_, i.e. the width and height of its current
[video mode](@ref monitor_modes).
@code
int width_mm, height_mm;
glfwGetMonitorPhysicalSize(monitor, &width_mm, &height_mm);
@endcode
While this can be used to calculate the raw DPI of a monitor, this is often not
useful. Instead use the [monitor content scale](@ref monitor_scale) and
[window content scale](@ref window_scale) to scale your content.
@subsection monitor_scale Content scale
The content scale for a monitor can be retrieved with @ref
glfwGetMonitorContentScale.
@code
float xscale, yscale;
glfwGetMonitorContentScale(monitor, &xscale, &yscale);
@endcode
The content scale is the ratio between the current DPI and the platform's
default DPI. This is especially important for text and any UI elements. If the
pixel dimensions of your UI scaled by this look appropriate on your machine then
it should appear at a reasonable size on other machines regardless of their DPI
and scaling settings. This relies on the system DPI and scaling settings being
somewhat correct.
The content scale may depend on both the monitor resolution and pixel density
and on user settings. It may be very different from the raw DPI calculated from
the physical size and current resolution.
@subsection monitor_pos Virtual position
The position of the monitor on the virtual desktop, in
[screen coordinates](@ref coordinate_systems), can be retrieved with @ref
glfwGetMonitorPos.
@code
int xpos, ypos;
glfwGetMonitorPos(monitor, &xpos, &ypos);
@endcode
@subsection monitor_workarea Work area
The area of a monitor not occupied by global task bars or menu bars is the work
area. This is specified in [screen coordinates](@ref coordinate_systems) and
can be retrieved with @ref glfwGetMonitorWorkarea.
@code
int xpos, ypos, width, height;
glfwGetMonitorWorkarea(monitor, &xpos, &ypos, &width, &height);
@endcode
@subsection monitor_name Human-readable name
The human-readable, UTF-8 encoded name of a monitor is returned by @ref
glfwGetMonitorName. See the reference documentation for the lifetime of the
returned string.
@code
const char* name = glfwGetMonitorName(monitor);
@endcode
Monitor names are not guaranteed to be unique. Two monitors of the same model
and make may have the same name. Only the monitor handle is guaranteed to be
unique, and only until that monitor is disconnected.
@subsection monitor_userptr User pointer
Each monitor has a user pointer that can be set with @ref
glfwSetMonitorUserPointer and queried with @ref glfwGetMonitorUserPointer. This
can be used for any purpose you need and will not be modified by GLFW. The
value will be kept until the monitor is disconnected or until the library is
terminated.
The initial value of the pointer is `NULL`.
@subsection monitor_gamma Gamma ramp
The gamma ramp of a monitor can be set with @ref glfwSetGammaRamp, which accepts
a monitor handle and a pointer to a @ref GLFWgammaramp structure.
@code
GLFWgammaramp ramp;
unsigned short red[256], green[256], blue[256];
ramp.size = 256;
ramp.red = red;
ramp.green = green;
ramp.blue = blue;
for (i = 0; i < ramp.size; i++)
{
// Fill out gamma ramp arrays as desired
}
glfwSetGammaRamp(monitor, &ramp);
@endcode
The gamma ramp data is copied before the function returns, so there is no need
to keep it around once the ramp has been set.
It is recommended that your gamma ramp have the same size as the current gamma
ramp for that monitor.
The current gamma ramp for a monitor is returned by @ref glfwGetGammaRamp. See
the reference documentation for the lifetime of the returned structure.
@code
const GLFWgammaramp* ramp = glfwGetGammaRamp(monitor);
@endcode
If you wish to set a regular gamma ramp, you can have GLFW calculate it for you
from the desired exponent with @ref glfwSetGamma, which in turn calls @ref
glfwSetGammaRamp with the resulting ramp.
@code
glfwSetGamma(monitor, 1.0);
@endcode
To experiment with gamma correction via the @ref glfwSetGamma function, run the
`gamma` test program.
@note The software controlled gamma ramp is applied _in addition_ to the
hardware gamma correction, which today is usually an approximation of sRGB
gamma. This means that setting a perfectly linear ramp, or gamma 1.0, will
produce the default (usually sRGB-like) behavior.
*/

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/*!
@page moving_guide Moving from GLFW 2 to 3
@tableofcontents
This is a transition guide for moving from GLFW 2 to 3. It describes what has
changed or been removed, but does _not_ include
[new features](@ref news) unless they are required when moving an existing code
base onto the new API. For example, the new multi-monitor functions are
required to create full screen windows with GLFW 3.
@section moving_removed Changed and removed features
@subsection moving_renamed_files Renamed library and header file
The GLFW 3 header is named @ref glfw3.h and moved to the `GLFW` directory, to
avoid collisions with the headers of other major versions. Similarly, the GLFW
3 library is named `glfw3,` except when it's installed as a shared library on
Unix-like systems, where it uses the
[soname](https://en.wikipedia.org/wiki/soname) `libglfw.so.3`.
@par Old syntax
@code
#include <GL/glfw.h>
@endcode
@par New syntax
@code
#include <GLFW/glfw3.h>
@endcode
@subsection moving_threads Removal of threading functions
The threading functions have been removed, including the per-thread sleep
function. They were fairly primitive, under-used, poorly integrated and took
time away from the focus of GLFW (i.e. context, input and window). There are
better threading libraries available and native threading support is available
in both [C++11](https://en.cppreference.com/w/cpp/thread) and
[C11](https://en.cppreference.com/w/c/thread), both of which are gaining
traction.
If you wish to use the C++11 or C11 facilities but your compiler doesn't yet
support them, see the
[TinyThread++](https://gitorious.org/tinythread/tinythreadpp) and
[TinyCThread](https://github.com/tinycthread/tinycthread) projects created by
the original author of GLFW. These libraries implement a usable subset of the
threading APIs in C++11 and C11, and in fact some GLFW 3 test programs use
TinyCThread.
However, GLFW 3 has better support for _use from multiple threads_ than GLFW
2 had. Contexts can be made current on any thread, although only a single
thread at a time, and the documentation explicitly states which functions may be
used from any thread and which must only be used from the main thread.
@par Removed functions
`glfwSleep`, `glfwCreateThread`, `glfwDestroyThread`, `glfwWaitThread`,
`glfwGetThreadID`, `glfwCreateMutex`, `glfwDestroyMutex`, `glfwLockMutex`,
`glfwUnlockMutex`, `glfwCreateCond`, `glfwDestroyCond`, `glfwWaitCond`,
`glfwSignalCond`, `glfwBroadcastCond` and `glfwGetNumberOfProcessors`.
@par Removed types
`GLFWthreadfun`
@subsection moving_image Removal of image and texture loading
The image and texture loading functions have been removed. They only supported
the Targa image format, making them mostly useful for beginner level examples.
To become of sufficiently high quality to warrant keeping them in GLFW 3, they
would need not only to support other formats, but also modern extensions to
OpenGL texturing. This would either add a number of external
dependencies (libjpeg, libpng, etc.), or force GLFW to ship with inline versions
of these libraries.
As there already are libraries doing this, it is unnecessary both to duplicate
the work and to tie the duplicate to GLFW. The resulting library would also be
platform-independent, as both OpenGL and stdio are available wherever GLFW is.
@par Removed functions
`glfwReadImage`, `glfwReadMemoryImage`, `glfwFreeImage`, `glfwLoadTexture2D`,
`glfwLoadMemoryTexture2D` and `glfwLoadTextureImage2D`.
@subsection moving_stdcall Removal of GLFWCALL macro
The `GLFWCALL` macro, which made callback functions use
[__stdcall](https://msdn.microsoft.com/en-us/library/zxk0tw93.aspx) on Windows,
has been removed. GLFW is written in C, not Pascal. Removing this macro means
there's one less thing for application programmers to remember, i.e. the
requirement to mark all callback functions with `GLFWCALL`. It also simplifies
the creation of DLLs and DLL link libraries, as there's no need to explicitly
disable `@n` entry point suffixes.
@par Old syntax
@code
void GLFWCALL callback_function(...);
@endcode
@par New syntax
@code
void callback_function(...);
@endcode
@subsection moving_window_handles Window handle parameters
Because GLFW 3 supports multiple windows, window handle parameters have been
added to all window-related GLFW functions and callbacks. The handle of
a newly created window is returned by @ref glfwCreateWindow (formerly
`glfwOpenWindow`). Window handles are pointers to the
[opaque](https://en.wikipedia.org/wiki/Opaque_data_type) type @ref GLFWwindow.
@par Old syntax
@code
glfwSetWindowTitle("New Window Title");
@endcode
@par New syntax
@code
glfwSetWindowTitle(window, "New Window Title");
@endcode
@subsection moving_monitor Explicit monitor selection
GLFW 3 provides support for multiple monitors. To request a full screen mode window,
instead of passing `GLFW_FULLSCREEN` you specify which monitor you wish the
window to use. The @ref glfwGetPrimaryMonitor function returns the monitor that
GLFW 2 would have selected, but there are many other
[monitor functions](@ref monitor_guide). Monitor handles are pointers to the
[opaque](https://en.wikipedia.org/wiki/Opaque_data_type) type @ref GLFWmonitor.
@par Old basic full screen
@code
glfwOpenWindow(640, 480, 8, 8, 8, 0, 24, 0, GLFW_FULLSCREEN);
@endcode
@par New basic full screen
@code
window = glfwCreateWindow(640, 480, "My Window", glfwGetPrimaryMonitor(), NULL);
@endcode
@note The framebuffer bit depth parameters of `glfwOpenWindow` have been turned
into [window hints](@ref window_hints), but as they have been given
[sane defaults](@ref window_hints_values) you rarely need to set these hints.
@subsection moving_autopoll Removal of automatic event polling
GLFW 3 does not automatically poll for events in @ref glfwSwapBuffers, meaning
you need to call @ref glfwPollEvents or @ref glfwWaitEvents yourself. Unlike
buffer swap, which acts on a single window, the event processing functions act
on all windows at once.
@par Old basic main loop
@code
while (...)
{
// Process input
// Render output
glfwSwapBuffers();
}
@endcode
@par New basic main loop
@code
while (...)
{
// Process input
// Render output
glfwSwapBuffers(window);
glfwPollEvents();
}
@endcode
@subsection moving_context Explicit context management
Each GLFW 3 window has its own OpenGL context and only you, the application
programmer, can know which context should be current on which thread at any
given time. Therefore, GLFW 3 leaves that decision to you.
This means that you need to call @ref glfwMakeContextCurrent after creating
a window before you can call any OpenGL functions.
@subsection moving_hidpi Separation of window and framebuffer sizes
Window positions and sizes now use screen coordinates, which may not be the same
as pixels on machines with high-DPI monitors. This is important as OpenGL uses
pixels, not screen coordinates. For example, the rectangle specified with
`glViewport` needs to use pixels. Therefore, framebuffer size functions have
been added. You can retrieve the size of the framebuffer of a window with @ref
glfwGetFramebufferSize function. A framebuffer size callback has also been
added, which can be set with @ref glfwSetFramebufferSizeCallback.
@par Old basic viewport setup
@code
glfwGetWindowSize(&width, &height);
glViewport(0, 0, width, height);
@endcode
@par New basic viewport setup
@code
glfwGetFramebufferSize(window, &width, &height);
glViewport(0, 0, width, height);
@endcode
@subsection moving_window_close Window closing changes
The `GLFW_OPENED` window parameter has been removed. As long as the window has
not been destroyed, whether through @ref glfwDestroyWindow or @ref
glfwTerminate, the window is "open".
A user attempting to close a window is now just an event like any other. Unlike
GLFW 2, windows and contexts created with GLFW 3 will never be destroyed unless
you choose them to be. Each window now has a close flag that is set to
`GLFW_TRUE` when the user attempts to close that window. By default, nothing else
happens and the window stays visible. It is then up to you to either destroy
the window, take some other action or ignore the request.
You can query the close flag at any time with @ref glfwWindowShouldClose and set
it at any time with @ref glfwSetWindowShouldClose.
@par Old basic main loop
@code
while (glfwGetWindowParam(GLFW_OPENED))
{
...
}
@endcode
@par New basic main loop
@code
while (!glfwWindowShouldClose(window))
{
...
}
@endcode
The close callback no longer returns a value. Instead, it is called after the
close flag has been set so it can override its value, if it chooses to, before
event processing completes. You may however not call @ref glfwDestroyWindow
from the close callback (or any other window related callback).
@par Old syntax
@code
int GLFWCALL window_close_callback(void);
@endcode
@par New syntax
@code
void window_close_callback(GLFWwindow* window);
@endcode
@note GLFW never clears the close flag to `GLFW_FALSE`, meaning you can use it
for other reasons to close the window as well, for example the user choosing
Quit from an in-game menu.
@subsection moving_hints Persistent window hints
The `glfwOpenWindowHint` function has been renamed to @ref glfwWindowHint.
Window hints are no longer reset to their default values on window creation, but
instead retain their values until modified by @ref glfwWindowHint or @ref
glfwDefaultWindowHints, or until the library is terminated and re-initialized.
@subsection moving_video_modes Video mode enumeration
Video mode enumeration is now per-monitor. The @ref glfwGetVideoModes function
now returns all available modes for a specific monitor instead of requiring you
to guess how large an array you need. The `glfwGetDesktopMode` function, which
had poorly defined behavior, has been replaced by @ref glfwGetVideoMode, which
returns the current mode of a monitor.
@subsection moving_char_up Removal of character actions
The action parameter of the [character callback](@ref GLFWcharfun) has been
removed. This was an artefact of the origin of GLFW, i.e. being developed in
English by a Swede. However, many keyboard layouts require more than one key to
produce characters with diacritical marks. Even the Swedish keyboard layout
requires this for uncommon cases like ü.
@par Old syntax
@code
void GLFWCALL character_callback(int character, int action);
@endcode
@par New syntax
@code
void character_callback(GLFWwindow* window, int character);
@endcode
@subsection moving_cursorpos Cursor position changes
The `glfwGetMousePos` function has been renamed to @ref glfwGetCursorPos,
`glfwSetMousePos` to @ref glfwSetCursorPos and `glfwSetMousePosCallback` to @ref
glfwSetCursorPosCallback.
The cursor position is now `double` instead of `int`, both for the direct
functions and for the callback. Some platforms can provide sub-pixel cursor
movement and this data is now passed on to the application where available. On
platforms where this is not provided, the decimal part is zero.
GLFW 3 only allows you to position the cursor within a window using @ref
glfwSetCursorPos (formerly `glfwSetMousePos`) when that window is active.
Unless the window is active, the function fails silently.
@subsection moving_wheel Wheel position replaced by scroll offsets
The `glfwGetMouseWheel` function has been removed. Scrolling is the input of
offsets and has no absolute position. The mouse wheel callback has been
replaced by a [scroll callback](@ref GLFWscrollfun) that receives
two-dimensional floating point scroll offsets. This allows you to receive
precise scroll data from for example modern touchpads.
@par Old syntax
@code
void GLFWCALL mouse_wheel_callback(int position);
@endcode
@par New syntax
@code
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
@endcode
@par Removed functions
`glfwGetMouseWheel`
@subsection moving_repeat Key repeat action
The `GLFW_KEY_REPEAT` enable has been removed and key repeat is always enabled
for both keys and characters. A new key action, `GLFW_REPEAT`, has been added
to allow the [key callback](@ref GLFWkeyfun) to distinguish an initial key press
from a repeat. Note that @ref glfwGetKey still returns only `GLFW_PRESS` or
`GLFW_RELEASE`.
@subsection moving_keys Physical key input
GLFW 3 key tokens map to physical keys, unlike in GLFW 2 where they mapped to
the values generated by the current keyboard layout. The tokens are named
according to the values they would have using the standard US layout, but this
is only a convenience, as most programmers are assumed to know that layout.
This means that (for example) `GLFW_KEY_LEFT_BRACKET` is always a single key and
is the same key in the same place regardless of what keyboard layouts the users
of your program has.
The key input facility was never meant for text input, although using it that
way worked slightly better in GLFW 2. If you were using it to input text, you
should be using the character callback instead, on both GLFW 2 and 3. This will
give you the characters being input, as opposed to the keys being pressed.
GLFW 3 has key tokens for all keys on a standard 105 key keyboard, so instead of
having to remember whether to check for `a` or `A`, you now check for
@ref GLFW_KEY_A.
@subsection moving_joystick Joystick function changes
The `glfwGetJoystickPos` function has been renamed to @ref glfwGetJoystickAxes.
The `glfwGetJoystickParam` function and the `GLFW_PRESENT`, `GLFW_AXES` and
`GLFW_BUTTONS` tokens have been replaced by the @ref glfwJoystickPresent
function as well as axis and button counts returned by the @ref
glfwGetJoystickAxes and @ref glfwGetJoystickButtons functions.
@subsection moving_mbcs Win32 MBCS support
The Win32 port of GLFW 3 will not compile in
[MBCS mode](https://msdn.microsoft.com/en-us/library/5z097dxa.aspx).
However, because the use of the Unicode version of the Win32 API doesn't affect
the process as a whole, but only those windows created using it, it's perfectly
possible to call MBCS functions from other parts of the same application.
Therefore, even if an application using GLFW has MBCS mode code, there's no need
for GLFW itself to support it.
@subsection moving_windows Support for versions of Windows older than XP
All explicit support for version of Windows older than XP has been removed.
There is no code that actively prevents GLFW 3 from running on these earlier
versions, but it uses Win32 functions that those versions lack.
Windows XP was released in 2001, and by now (January 2015) it has not only
replaced almost all earlier versions of Windows, but is itself rapidly being
replaced by Windows 7 and 8. The MSDN library doesn't even provide
documentation for version older than Windows 2000, making it difficult to
maintain compatibility with these versions even if it was deemed worth the
effort.
The Win32 API has also not stood still, and GLFW 3 uses many functions only
present on Windows XP or later. Even supporting an OS as new as XP (new
from the perspective of GLFW 2, which still supports Windows 95) requires
runtime checking for a number of functions that are present only on modern
version of Windows.
@subsection moving_syskeys Capture of system-wide hotkeys
The ability to disable and capture system-wide hotkeys like Alt+Tab has been
removed. Modern applications, whether they're games, scientific visualisations
or something else, are nowadays expected to be good desktop citizens and allow
these hotkeys to function even when running in full screen mode.
@subsection moving_terminate Automatic termination
GLFW 3 does not register @ref glfwTerminate with `atexit` at initialization,
because `exit` calls registered functions from the calling thread and while it
is permitted to call `exit` from any thread, @ref glfwTerminate must only be
called from the main thread.
To release all resources allocated by GLFW, you should call @ref glfwTerminate
yourself, from the main thread, before the program terminates. Note that this
destroys all windows not already destroyed with @ref glfwDestroyWindow,
invalidating any window handles you may still have.
@subsection moving_glu GLU header inclusion
GLFW 3 does not by default include the GLU header and GLU itself has been
deprecated by [Khronos](https://en.wikipedia.org/wiki/Khronos_Group). __New
projects should not use GLU__, but if you need it for legacy code that
has been moved to GLFW 3, you can request that the GLFW header includes it by
defining @ref GLFW_INCLUDE_GLU before the inclusion of the GLFW header.
@par Old syntax
@code
#include <GL/glfw.h>
@endcode
@par New syntax
@code
#define GLFW_INCLUDE_GLU
#include <GLFW/glfw3.h>
@endcode
There are many libraries that offer replacements for the functionality offered
by GLU. For the matrix helper functions, see math libraries like
[GLM](https://github.com/g-truc/glm) (for C++),
[linmath.h](https://github.com/datenwolf/linmath.h) (for C) and others. For the
tessellation functions, see for example
[libtess2](https://github.com/memononen/libtess2).
@section moving_tables Name change tables
@subsection moving_renamed_functions Renamed functions
| GLFW 2 | GLFW 3 | Notes |
| --------------------------- | ----------------------------- | ----- |
| `glfwOpenWindow` | @ref glfwCreateWindow | All channel bit depths are now hints
| `glfwCloseWindow` | @ref glfwDestroyWindow | |
| `glfwOpenWindowHint` | @ref glfwWindowHint | Now accepts all `GLFW_*_BITS` tokens |
| `glfwEnable` | @ref glfwSetInputMode | |
| `glfwDisable` | @ref glfwSetInputMode | |
| `glfwGetMousePos` | @ref glfwGetCursorPos | |
| `glfwSetMousePos` | @ref glfwSetCursorPos | |
| `glfwSetMousePosCallback` | @ref glfwSetCursorPosCallback | |
| `glfwSetMouseWheelCallback` | @ref glfwSetScrollCallback | Accepts two-dimensional scroll offsets as doubles |
| `glfwGetJoystickPos` | @ref glfwGetJoystickAxes | |
| `glfwGetWindowParam` | @ref glfwGetWindowAttrib | |
| `glfwGetGLVersion` | @ref glfwGetWindowAttrib | Use `GLFW_CONTEXT_VERSION_MAJOR`, `GLFW_CONTEXT_VERSION_MINOR` and `GLFW_CONTEXT_REVISION` |
| `glfwGetDesktopMode` | @ref glfwGetVideoMode | Returns the current mode of a monitor |
| `glfwGetJoystickParam` | @ref glfwJoystickPresent | The axis and button counts are provided by @ref glfwGetJoystickAxes and @ref glfwGetJoystickButtons |
@subsection moving_renamed_types Renamed types
| GLFW 2 | GLFW 3 | Notes |
| ------------------- | --------------------- | |
| `GLFWmousewheelfun` | @ref GLFWscrollfun | |
| `GLFWmouseposfun` | @ref GLFWcursorposfun | |
@subsection moving_renamed_tokens Renamed tokens
| GLFW 2 | GLFW 3 | Notes |
| --------------------------- | ---------------------------- | ----- |
| `GLFW_OPENGL_VERSION_MAJOR` | `GLFW_CONTEXT_VERSION_MAJOR` | Renamed as it applies to OpenGL ES as well |
| `GLFW_OPENGL_VERSION_MINOR` | `GLFW_CONTEXT_VERSION_MINOR` | Renamed as it applies to OpenGL ES as well |
| `GLFW_FSAA_SAMPLES` | `GLFW_SAMPLES` | Renamed to match the OpenGL API |
| `GLFW_ACTIVE` | `GLFW_FOCUSED` | Renamed to match the window focus callback |
| `GLFW_WINDOW_NO_RESIZE` | `GLFW_RESIZABLE` | The default has been inverted |
| `GLFW_MOUSE_CURSOR` | `GLFW_CURSOR` | Used with @ref glfwSetInputMode |
| `GLFW_KEY_ESC` | `GLFW_KEY_ESCAPE` | |
| `GLFW_KEY_DEL` | `GLFW_KEY_DELETE` | |
| `GLFW_KEY_PAGEUP` | `GLFW_KEY_PAGE_UP` | |
| `GLFW_KEY_PAGEDOWN` | `GLFW_KEY_PAGE_DOWN` | |
| `GLFW_KEY_KP_NUM_LOCK` | `GLFW_KEY_NUM_LOCK` | |
| `GLFW_KEY_LCTRL` | `GLFW_KEY_LEFT_CONTROL` | |
| `GLFW_KEY_LSHIFT` | `GLFW_KEY_LEFT_SHIFT` | |
| `GLFW_KEY_LALT` | `GLFW_KEY_LEFT_ALT` | |
| `GLFW_KEY_LSUPER` | `GLFW_KEY_LEFT_SUPER` | |
| `GLFW_KEY_RCTRL` | `GLFW_KEY_RIGHT_CONTROL` | |
| `GLFW_KEY_RSHIFT` | `GLFW_KEY_RIGHT_SHIFT` | |
| `GLFW_KEY_RALT` | `GLFW_KEY_RIGHT_ALT` | |
| `GLFW_KEY_RSUPER` | `GLFW_KEY_RIGHT_SUPER` | |
*/

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/*!
@page news Release notes
@tableofcontents
@section news_33 Release notes for version 3.3
These are the release notes for version 3.3. For a more detailed view including
all fixed bugs see the [version history](https://www.glfw.org/changelog.html).
Please review the caveats, deprecations and removals if your project was written
against an earlier version of GLFW 3.
@subsection features_33 New features in version 3.3
@subsubsection gamepad_33 Gamepad input via SDL_GameControllerDB
GLFW can now remap game controllers to a standard Xbox-like layout using
a built-in copy of SDL_GameControllerDB. Call @ref glfwJoystickIsGamepad to
check if a joystick has a mapping, @ref glfwGetGamepadState to retrieve its
input state, @ref glfwUpdateGamepadMappings to add newer mappings and @ref
glfwGetGamepadName and @ref glfwGetJoystickGUID for mapping related information.
For more information see @ref gamepad.
@subsubsection moltenvk_33 Support for Vulkan on macOS via MoltenVK
GLFW now supports [MoltenVK](https://moltengl.com/moltenvk/), a Vulkan
implementation on top of the Metal API, and its `VK_MVK_macos_surface` window
surface creation extension. MoltenVK is included in the [macOS Vulkan
SDK](https://vulkan.lunarg.com/).
For more information see @ref vulkan_guide.
@subsubsection content_scale_33 Content scale queries for DPI-aware rendering
GLFW now provides content scales for windows and monitors, i.e. the ratio
between their current DPI and the platform's default DPI, with @ref
glfwGetWindowContentScale and @ref glfwGetMonitorContentScale.
Changes of the content scale of a window can be received with the window content
scale callback, set with @ref glfwSetWindowContentScaleCallback.
The @ref GLFW_SCALE_TO_MONITOR window hint enables automatic resizing of a
window by the content scale of the monitor it is placed, on platforms like
Windows where this is necessary. This takes effect both on creation and when
the window is moved between monitors. It is related to but different from
[GLFW_COCOA_RETINA_FRAMEBUFFER](@ref GLFW_COCOA_RETINA_FRAMEBUFFER_hint).
For more information see @ref window_scale.
@subsubsection setwindowattrib_33 Support for updating window attributes
GLFW now supports changing the [GLFW_DECORATED](@ref GLFW_DECORATED_attrib),
[GLFW_RESIZABLE](@ref GLFW_RESIZABLE_attrib),
[GLFW_FLOATING](@ref GLFW_FLOATING_attrib),
[GLFW_AUTO_ICONIFY](@ref GLFW_AUTO_ICONIFY_attrib) and
[GLFW_FOCUS_ON_SHOW](@ref GLFW_FOCUS_ON_SHOW_attrib) attributes for existing
windows with @ref glfwSetWindowAttrib.
For more information see @ref window_attribs.
@subsubsection raw_motion_33 Support for raw mouse motion
GLFW now supports raw (unscaled and unaccelerated) mouse motion in disabled
cursor mode with the [GLFW_RAW_MOUSE_MOTION](@ref GLFW_RAW_MOUSE_MOTION) input
mode. Raw mouse motion input is not yet implemented on macOS. Call @ref
glfwRawMouseMotionSupported to check if GLFW can provide raw mouse motion on the
current system.
For more information see @ref raw_mouse_motion.
@subsubsection joysticks_33 Joystick hats
GLFW can now return the state of hats (i.e. POVs or D-pads) of a joystick with
@ref glfwGetJoystickHats. For compatibility, hats are also exposed as buttons.
This can be disabled with the @ref GLFW_JOYSTICK_HAT_BUTTONS initialization
hint.
For more information see @ref joystick_hat.
@subsubsection geterror_33 Error query
GLFW now supports querying the last error code for the calling thread and its
human-readable description with @ref glfwGetError. This can be used instead of
or together with the error callback.
For more information see @ref error_handling.
@subsubsection init_hints_33 Support for initialization hints
GLFW now supports setting library initialization hints with @ref glfwInitHint.
These must be set before initialization to take effect. Some of these hints are
platform specific but are safe to set on any platform.
For more information see @ref init_hints.
@subsubsection attention_33 User attention request
GLFW now supports requesting user attention with @ref
glfwRequestWindowAttention. Where possible this calls attention to the
specified window. On platforms like macOS it calls attention to the whole
application.
For more information see @ref window_attention.
@subsubsection maximize_33 Window maximization callback
GLFW now supports notifying the application that the window has been maximized
@ref glfwSetWindowMaximizeCallback. This is called both when the window was
maximized by the user and when it was done with @ref glfwMaximizeWindow.
For more information see @ref window_maximize.
@subsubsection workarea_33 Query for the monitor work area
GLFW now supports querying the work area of a monitor, i.e. the area not
occupied by task bars or global menu bars, with @ref glfwGetMonitorWorkarea. On
platforms that lack this concept, the whole area of the monitor is returned.
For more information see @ref monitor_workarea.
@subsubsection transparency_33 Transparent windows and framebuffers
GLFW now supports the creation of windows with transparent framebuffers on
systems with desktop compositing enabled with the @ref
GLFW_TRANSPARENT_FRAMEBUFFER window hint and attribute. This hint must be set
before window creation and leaves any window decorations opaque.
GLFW now also supports whole window transparency with @ref glfwGetWindowOpacity
and @ref glfwSetWindowOpacity. This value controls the opacity of the whole
window including decorations and unlike framebuffer transparency can be changed
at any time after window creation.
For more information see @ref window_transparency.
@subsubsection key_scancode_33 Query for the scancode of a key
GLFW now supports querying the platform dependent scancode of any physical key
with @ref glfwGetKeyScancode.
For more information see @ref input_key.
@subsubsection center_cursor_33 Cursor centering window hint
GLFW now supports controlling whether the cursor is centered over newly created
full screen windows with the [GLFW_CENTER_CURSOR](@ref GLFW_CENTER_CURSOR_hint)
window hint. It is enabled by default.
@subsubsection cursor_hover_33 Mouse cursor hover window attribute
GLFW now supports polling whether the cursor is hovering over the window content
area with the [GLFW_HOVERED](@ref GLFW_HOVERED_attrib) window attribute. This
attribute corresponds to the [cursor enter/leave](@ref cursor_enter) event.
@subsubsection focusonshow_33 Window hint and attribute for input focus on show
GLFW now has the [GLFW_FOCUS_ON_SHOW](@ref GLFW_DECORATED_hint) window hint and
attribute for controlling whether a window gets input focus when shown. It is
enabled by default. It applies both when creating an visible window with @ref
glfwCreateWindow and when showing it with @ref glfwShowWindow.
This is a workaround for GLFW 3.0 lacking @ref glfwFocusWindow and will be
corrected in the next major version.
For more information see @ref window_hide.
@subsubsection device_userptr_33 Monitor and joystick user pointers
GLFW now supports setting and querying user pointers for connected monitors and
joysticks with @ref glfwSetMonitorUserPointer, @ref glfwGetMonitorUserPointer,
@ref glfwSetJoystickUserPointer and @ref glfwGetJoystickUserPointer.
For more information see @ref monitor_userptr and @ref joystick_userptr.
@subsubsection macos_nib_33 macOS menu bar from nib file
GLFW will now load a `MainMenu.nib` file if found in the `Contents/Resources`
directory of the application bundle, as a way to replace the GLFW menu bar
without recompiling GLFW. This behavior can be disabled with the
[GLFW_COCOA_MENUBAR](@ref GLFW_COCOA_MENUBAR_hint) initialization hint.
@subsubsection glext_33 Support for more context creation extensions
The context hint @ref GLFW_SRGB_CAPABLE now supports OpenGL ES via
`WGL_EXT_colorspace`, the context hint @ref GLFW_CONTEXT_NO_ERROR now supports
`WGL_ARB_create_context_no_error` and `GLX_ARB_create_context_no_error`, the
context hint @ref GLFW_CONTEXT_RELEASE_BEHAVIOR now supports
`EGL_KHR_context_flush_control` and @ref glfwGetProcAddress now supports
`EGL_KHR_get_all_proc_addresses`.
@subsubsection osmesa_33 OSMesa off-screen context creation support
GLFW now supports creating off-screen OpenGL contexts using
[OSMesa](https://www.mesa3d.org/osmesa.html) by setting
[GLFW_CONTEXT_CREATION_API](@ref GLFW_CONTEXT_CREATION_API_hint) to
`GLFW_OSMESA_CONTEXT_API`. Native access function have been added to retrieve
the OSMesa color and depth buffers.
There is also a new null backend that uses OSMesa as its native context
creation API, intended for automated testing. This backend does not provide
input.
@subsection caveats_33 Caveats for version 3.3
@subsubsection joystick_layout_33 Layout of joysticks have changed
The way joystick elements are arranged have changed to match SDL2 in order to
support SDL_GameControllerDB mappings. The layout of joysticks may
change again if required for compatibility with SDL2. If you need a known and
stable layout for game controllers, see if you can switch to @ref gamepad.
Existing code that depends on a specific joystick layout will likely have to be
updated.
@subsubsection wait_events_33 No window required to wait for events
The @ref glfwWaitEvents and @ref glfwWaitEventsTimeout functions no longer need
a window to be created to wait for events. Before version 3.3 these functions
would return immediately if there were no user-created windows. On platforms
where only windows can receive events, an internal helper window is used.
Existing code that depends on the earlier behavior will likely have to be
updated.
@subsubsection gamma_ramp_size_33 Gamma ramp size of 256 may be rejected
The documentation for versions before 3.3 stated that a gamma ramp size of 256
would always be accepted. This was never the case on X11 and could lead to
artifacts on macOS. The @ref glfwSetGamma function has been updated to always
generate a ramp of the correct size.
Existing code that hardcodes a size of 256 should be updated to use the size of
the current ramp of a monitor when setting a new ramp for that monitor.
@subsubsection xinput_deadzone_33 Windows XInput deadzone removed
GLFW no longer applies any deadzone to the input state received from the XInput
API. This was never done for any other platform joystick API so this change
makes the behavior more consistent but you will need to apply your own deadzone
if desired.
@subsubsection x11_clipboard_33 X11 clipboard transfer limits
GLFW now supports reading clipboard text via the `INCR` method, which removes
the limit on how much text can be read with @ref glfwGetClipboardString.
However, writing via this method is not yet supported, so you may not be able to
write a very large string with @ref glfwSetClipboardString even if you read it
from the clipboard earlier.
The exact size limit for writing to the clipboard is negotiated with each
receiving application but is at least several tens of kilobytes. Note that only
the read limit has changed. Any string that could be written before still can
be.
@subsubsection x11_linking_33 X11 extension libraries are loaded dynamically
GLFW now loads all X11 extension libraries at initialization. The only X11
library you need to link against is `libX11`. The header files for the
extension libraries are still required for compilation.
Existing projects and makefiles that link GLFW directly against the extension
libraries should still build correctly but will add these libraries as load-time
dependencies.
@subsubsection cmake_version_33 CMake 3.0 or later is required
The minimum CMake version has been raised from 2.8.12 to 3.0. This is only
a requirement of the GLFW CMake files. The GLFW source files do not depend on
CMake.
@subsubsection caveat_fbtransparency_33 Framebuffer transparency requires DWM transparency
GLFW no longer supports framebuffer transparency enabled via @ref
GLFW_TRANSPARENT_FRAMEBUFFER on Windows 7 if DWM transparency is off
(the Transparency setting under Personalization > Window Color).
@subsection deprecations_33 Deprecations in version 3.3
@subsubsection charmods_callback_33 Character with modifiers callback
The character with modifiers callback set with @ref glfwSetCharModsCallback has
been deprecated and should if possible not be used.
Existing code should still work but further bug fixes will likely not be made.
The callback will be removed in the next major version.
@subsubsection clipboard_window_33 Window parameter to clipboard functions
The window parameter of the clipboard functions @ref glfwGetClipboardString and
@ref glfwSetClipboardString has been deprecated and is no longer used on any
platform. On platforms where the clipboard must be owned by a specific window,
an internal helper window is used.
Existing code should still work unless it depends on a specific window owning
the clipboard. New code may pass `NULL` as the window argument. The parameter
will be removed in a future release.
@subsection removals_33 Removals in 3.3
@subsubsection macos_options_33 macOS specific CMake options and macros
The `GLFW_USE_RETINA`, `GLFW_USE_CHDIR` and `GLFW_USE_MENUBAR` CMake options and
the `_GLFW_USE_RETINA`, `_GLFW_USE_CHDIR` and `_GLFW_USE_MENUBAR` compile-time
macros have been removed.
These options and macros are replaced by the window hint
[GLFW_COCOA_RETINA_FRAMEBUFFER](@ref GLFW_COCOA_RETINA_FRAMEBUFFER_hint)
and the init hints
[GLFW_COCOA_CHDIR_RESOURCES](@ref GLFW_COCOA_CHDIR_RESOURCES_hint) and
[GLFW_COCOA_MENUBAR](@ref GLFW_COCOA_MENUBAR_hint).
Existing projects and makefiles that set these options or define these macros
during compilation of GLFW will still build but it will have no effect and the
default behaviors will be used.
@subsubsection vulkan_sdk_33 LunarG Vulkan SDK dependency
The GLFW test programs that previously depended on the LunarG Vulkan SDK now
instead uses a Vulkan loader generated by
[glad2](https://github.com/Dav1dde/glad). This means the GLFW CMake files no
longer look for the Vulkan SDK.
Existing CMake projects that depended on the Vulkan SDK cache variables from
GLFW will need to call `find_package(Vulkan)` themselves. CMake 3.7 and later
already comes with a
[Vulkan find module](https://cmake.org/cmake/help/latest/module/FindVulkan.html)
similar to the one GLFW previously included.
@subsubsection lib_suffix_33 CMake option LIB_SUFFIX
The `LIB_SUFFIX` CMake option has been removed. GLFW now uses the
GNUInstallDirs CMake package to handle platform specific details like the
library directory suffix and the `LIB_SUFFIX` CMake option has been removed.
Existing projects and makefiles that set the `LIB_SUFFIX` option will use the
suffix chosen by the GNUInstallDirs package and the option will be ignored.
@subsubsection mir_removed_33 Mir support
The experimental Mir support has been completely removed as the Mir project has
implemented support for the Wayland protocol and is recommending that
applications use that instead.
Existing projects and makefiles that select Mir when compiling GLFW will fail.
Use Wayland or X11 instead.
@subsection symbols_33 New symbols in version 3.3
@subsubsection functions_33 New functions in version 3.3
- @ref glfwInitHint
- @ref glfwGetError
- @ref glfwGetMonitorWorkarea
- @ref glfwGetMonitorContentScale
- @ref glfwGetMonitorUserPointer
- @ref glfwSetMonitorUserPointer
- @ref glfwWindowHintString
- @ref glfwGetWindowContentScale
- @ref glfwGetWindowOpacity
- @ref glfwSetWindowOpacity
- @ref glfwRequestWindowAttention
- @ref glfwSetWindowAttrib
- @ref glfwSetWindowMaximizeCallback
- @ref glfwSetWindowContentScaleCallback
- @ref glfwRawMouseMotionSupported
- @ref glfwGetKeyScancode
- @ref glfwGetJoystickHats
- @ref glfwGetJoystickGUID
- @ref glfwGetJoystickUserPointer
- @ref glfwSetJoystickUserPointer
- @ref glfwJoystickIsGamepad
- @ref glfwUpdateGamepadMappings
- @ref glfwGetGamepadName
- @ref glfwGetGamepadState
@subsubsection types_33 New types in version 3.3
- @ref GLFWwindowmaximizefun
- @ref GLFWwindowcontentscalefun
- @ref GLFWgamepadstate
@subsubsection constants_33 New constants in version 3.3
- @ref GLFW_NO_ERROR
- @ref GLFW_JOYSTICK_HAT_BUTTONS
- @ref GLFW_COCOA_CHDIR_RESOURCES
- @ref GLFW_COCOA_MENUBAR
- @ref GLFW_CENTER_CURSOR
- @ref GLFW_TRANSPARENT_FRAMEBUFFER
- @ref GLFW_HOVERED
- @ref GLFW_FOCUS_ON_SHOW
- @ref GLFW_SCALE_TO_MONITOR
- @ref GLFW_COCOA_RETINA_FRAMEBUFFER
- @ref GLFW_COCOA_FRAME_NAME
- @ref GLFW_COCOA_GRAPHICS_SWITCHING
- @ref GLFW_X11_CLASS_NAME
- @ref GLFW_X11_INSTANCE_NAME
- @ref GLFW_OSMESA_CONTEXT_API
- @ref GLFW_HAT_CENTERED
- @ref GLFW_HAT_UP
- @ref GLFW_HAT_RIGHT
- @ref GLFW_HAT_DOWN
- @ref GLFW_HAT_LEFT
- @ref GLFW_HAT_RIGHT_UP
- @ref GLFW_HAT_RIGHT_DOWN
- @ref GLFW_HAT_LEFT_UP
- @ref GLFW_HAT_LEFT_DOWN
- @ref GLFW_MOD_CAPS_LOCK
- @ref GLFW_MOD_NUM_LOCK
- @ref GLFW_LOCK_KEY_MODS
- @ref GLFW_RAW_MOUSE_MOTION
- @ref GLFW_GAMEPAD_BUTTON_A
- @ref GLFW_GAMEPAD_BUTTON_B
- @ref GLFW_GAMEPAD_BUTTON_X
- @ref GLFW_GAMEPAD_BUTTON_Y
- @ref GLFW_GAMEPAD_BUTTON_LEFT_BUMPER
- @ref GLFW_GAMEPAD_BUTTON_RIGHT_BUMPER
- @ref GLFW_GAMEPAD_BUTTON_BACK
- @ref GLFW_GAMEPAD_BUTTON_START
- @ref GLFW_GAMEPAD_BUTTON_GUIDE
- @ref GLFW_GAMEPAD_BUTTON_LEFT_THUMB
- @ref GLFW_GAMEPAD_BUTTON_RIGHT_THUMB
- @ref GLFW_GAMEPAD_BUTTON_DPAD_UP
- @ref GLFW_GAMEPAD_BUTTON_DPAD_RIGHT
- @ref GLFW_GAMEPAD_BUTTON_DPAD_DOWN
- @ref GLFW_GAMEPAD_BUTTON_DPAD_LEFT
- @ref GLFW_GAMEPAD_BUTTON_LAST
- @ref GLFW_GAMEPAD_BUTTON_CROSS
- @ref GLFW_GAMEPAD_BUTTON_CIRCLE
- @ref GLFW_GAMEPAD_BUTTON_SQUARE
- @ref GLFW_GAMEPAD_BUTTON_TRIANGLE
- @ref GLFW_GAMEPAD_AXIS_LEFT_X
- @ref GLFW_GAMEPAD_AXIS_LEFT_Y
- @ref GLFW_GAMEPAD_AXIS_RIGHT_X
- @ref GLFW_GAMEPAD_AXIS_RIGHT_Y
- @ref GLFW_GAMEPAD_AXIS_LEFT_TRIGGER
- @ref GLFW_GAMEPAD_AXIS_RIGHT_TRIGGER
- @ref GLFW_GAMEPAD_AXIS_LAST
@section news_32 Release notes for 3.2
These are the release notes for version 3.2. For a more detailed view including
all fixed bugs see the [version history](https://www.glfw.org/changelog.html).
@subsection features_32 New features in version 3.2
@subsubsection news_32_vulkan Support for Vulkan
GLFW now supports basic integration with Vulkan with @ref glfwVulkanSupported,
@ref glfwGetRequiredInstanceExtensions, @ref glfwGetInstanceProcAddress, @ref
glfwGetPhysicalDevicePresentationSupport and @ref glfwCreateWindowSurface.
Vulkan header inclusion can be selected with
@ref GLFW_INCLUDE_VULKAN.
@subsubsection news_32_setwindowmonitor Window mode switching
GLFW now supports switching between windowed and full screen modes and updating
the monitor and desired resolution and refresh rate of full screen windows with
@ref glfwSetWindowMonitor.
@subsubsection news_32_maximize Window maxmimization support
GLFW now supports window maximization with @ref glfwMaximizeWindow and the
@ref GLFW_MAXIMIZED window hint and attribute.
@subsubsection news_32_focus Window input focus control
GLFW now supports giving windows input focus with @ref glfwFocusWindow.
@subsubsection news_32_sizelimits Window size limit support
GLFW now supports setting both absolute and relative window size limits with
@ref glfwSetWindowSizeLimits and @ref glfwSetWindowAspectRatio.
@subsubsection news_32_keyname Localized key names
GLFW now supports querying the localized name of printable keys with @ref
glfwGetKeyName, either by key token or by scancode.
@subsubsection news_32_waittimeout Wait for events with timeout
GLFW now supports waiting for events for a set amount of time with @ref
glfwWaitEventsTimeout.
@subsubsection news_32_icon Window icon support
GLFW now supports setting the icon of windows with @ref glfwSetWindowIcon.
@subsubsection news_32_timer Raw timer access
GLFW now supports raw timer values with @ref glfwGetTimerValue and @ref
glfwGetTimerFrequency.
@subsubsection news_32_joystick Joystick connection callback
GLFW now supports notifying when a joystick has been connected or disconnected
with @ref glfwSetJoystickCallback.
@subsubsection news_32_noapi Context-less windows
GLFW now supports creating windows without a OpenGL or OpenGL ES context by
setting the [GLFW_CLIENT_API](@ref GLFW_CLIENT_API_hint) hint to `GLFW_NO_API`.
@subsubsection news_32_contextapi Run-time context creation API selection
GLFW now supports selecting and querying the context creation API at run-time
with the @ref GLFW_CONTEXT_CREATION_API hint and attribute.
@subsubsection news_32_noerror Error-free context creation
GLFW now supports creating and querying OpenGL and OpenGL ES contexts that do
not emit errors with the @ref GLFW_CONTEXT_NO_ERROR hint, provided the machine
supports the `GL_KHR_no_error` extension.
@subsubsection news_32_cmake CMake config-file package support
GLFW now supports being used as a
[config-file package](@ref build_link_cmake_package) from other projects for
easy linking with the library and its dependencies.
@section news_31 Release notes for 3.1
These are the release notes for version 3.1. For a more detailed view including
all fixed bugs see the [version history](https://www.glfw.org/changelog.html).
@subsection features_31 New features in version 3.1
@subsubsection news_31_cursor Custom mouse cursor images
GLFW now supports creating and setting both custom cursor images and standard
cursor shapes. They are created with @ref glfwCreateCursor or @ref
glfwCreateStandardCursor, set with @ref glfwSetCursor and destroyed with @ref
glfwDestroyCursor.
@see @ref cursor_object
@subsubsection news_31_drop Path drop event
GLFW now provides a callback for receiving the paths of files and directories
dropped onto GLFW windows. The callback is set with @ref glfwSetDropCallback.
@see @ref path_drop
@subsubsection news_31_emptyevent Main thread wake-up
GLFW now provides the @ref glfwPostEmptyEvent function for posting an empty
event from another thread to the main thread event queue, causing @ref
glfwWaitEvents to return.
@see @ref events
@subsubsection news_31_framesize Window frame size query
GLFW now supports querying the size, on each side, of the frame around the
content area of a window, with @ref glfwGetWindowFrameSize.
@see [Window size](@ref window_size)
@subsubsection news_31_autoiconify Simultaneous multi-monitor rendering
GLFW now supports disabling auto-iconification of full screen windows with
the [GLFW_AUTO_ICONIFY](@ref GLFW_AUTO_ICONIFY_hint) window hint. This is
intended for people building multi-monitor installations, where you need windows
to stay in full screen despite losing input focus.
@subsubsection news_31_floating Floating windows
GLFW now supports floating windows, also called topmost or always on top, for
easier debugging with the @ref GLFW_FLOATING window hint and attribute.
@subsubsection news_31_focused Initially unfocused windows
GLFW now supports preventing a windowed mode window from gaining input focus on
creation, with the [GLFW_FOCUSED](@ref GLFW_FOCUSED_hint) window hint.
@subsubsection news_31_direct Direct access for window attributes and cursor position
GLFW now queries the window input focus, visibility and iconification attributes
and the cursor position directly instead of returning cached data.
@subsubsection news_31_charmods Character with modifiers callback
GLFW now provides a callback for character events with modifier key bits. The
callback is set with @ref glfwSetCharModsCallback. Unlike the regular character
callback, this will report character events that will not result in a character
being input, for example if the Control key is held down.
@see @ref input_char
@subsubsection news_31_single Single buffered framebuffers
GLFW now supports the creation of single buffered windows, with the @ref
GLFW_DOUBLEBUFFER hint.
@subsubsection news_31_glext Macro for including extension header
GLFW now includes the extension header appropriate for the chosen OpenGL or
OpenGL ES header when @ref GLFW_INCLUDE_GLEXT is defined. GLFW does not provide
these headers. They must be provided by your development environment or your
OpenGL or OpenGL ES SDK.
@subsubsection news_31_release Context release behaviors
GLFW now supports controlling and querying whether the pipeline is flushed when
a context is made non-current, with the @ref GLFW_CONTEXT_RELEASE_BEHAVIOR hint
and attribute, provided the machine supports the `GL_KHR_context_flush_control`
extension.
@subsubsection news_31_wayland (Experimental) Wayland support
GLFW now has an _experimental_ Wayland display protocol backend that can be
selected on Linux with a CMake option.
@subsubsection news_31_mir (Experimental) Mir support
GLFW now has an _experimental_ Mir display server backend that can be selected
on Linux with a CMake option.
@section news_30 Release notes for 3.0
These are the release notes for version 3.0. For a more detailed view including
all fixed bugs see the [version history](https://www.glfw.org/changelog.html).
@subsection features_30 New features in version 3.0
@subsubsection news_30_cmake CMake build system
GLFW now uses the CMake build system instead of the various makefiles and
project files used by earlier versions. CMake is available for all platforms
supported by GLFW, is present in most package systems and can generate
makefiles and/or project files for most popular development environments.
For more information on how to use CMake, see the
[CMake manual](https://cmake.org/cmake/help/documentation.html).
@subsubsection news_30_multiwnd Multi-window support
GLFW now supports the creation of multiple windows, each with their own OpenGL
or OpenGL ES context, and all window functions now take a window handle. Event
callbacks are now per-window and are provided with the handle of the window that
received the event. The @ref glfwMakeContextCurrent function has been added to
select which context is current on a given thread.
@subsubsection news_30_multimon Multi-monitor support
GLFW now explicitly supports multiple monitors. They can be enumerated with
@ref glfwGetMonitors, queried with @ref glfwGetVideoModes, @ref
glfwGetMonitorPos, @ref glfwGetMonitorName and @ref glfwGetMonitorPhysicalSize,
and specified at window creation to make the newly created window full screen on
that specific monitor.
@subsubsection news_30_unicode Unicode support
All string arguments to GLFW functions and all strings returned by GLFW now use
the UTF-8 encoding. This includes the window title, error string, clipboard
text, monitor and joystick names as well as the extension function arguments (as
ASCII is a subset of UTF-8).
@subsubsection news_30_clipboard Clipboard text I/O
GLFW now supports reading and writing plain text to and from the system
clipboard, with the @ref glfwGetClipboardString and @ref glfwSetClipboardString
functions.
@subsubsection news_30_gamma Gamma ramp support
GLFW now supports setting and reading back the gamma ramp of monitors, with the
@ref glfwGetGammaRamp and @ref glfwSetGammaRamp functions. There is also @ref
glfwSetGamma, which generates a ramp from a gamma value and then sets it.
@subsubsection news_30_gles OpenGL ES support
GLFW now supports the creation of OpenGL ES contexts, by setting the
[GLFW_CLIENT_API](@ref GLFW_CLIENT_API_hint) hint to `GLFW_OPENGL_ES_API`, where
creation of such contexts are supported. Note that GLFW _does not implement_
OpenGL ES, so your driver must provide support in a way usable by GLFW. Modern
Nvidia and Intel drivers support creation of OpenGL ES context using the GLX and
WGL APIs, while AMD provides an EGL implementation instead.
@subsubsection news_30_egl (Experimental) EGL support
GLFW now has an experimental EGL context creation back end that can be selected
through CMake options.
@subsubsection news_30_hidpi High-DPI support
GLFW now supports high-DPI monitors on both Windows and macOS, giving windows
full resolution framebuffers where other UI elements are scaled up. To achieve
this, @ref glfwGetFramebufferSize and @ref glfwSetFramebufferSizeCallback have
been added. These work with pixels, while the rest of the GLFW API works with
screen coordinates. This is important as OpenGL uses pixels, not screen
coordinates.
@subsubsection news_30_error Error callback
GLFW now has an error callback, which can provide your application with much
more detailed diagnostics than was previously possible. The callback is passed
an error code and a description string.
@subsubsection news_30_wndptr Per-window user pointer
Each window now has a user-defined pointer, retrieved with @ref
glfwGetWindowUserPointer and set with @ref glfwSetWindowUserPointer, to make it
easier to integrate GLFW into C++ code.
@subsubsection news_30_iconifyfun Window iconification callback
Each window now has a callback for iconification and restoration events,
which is set with @ref glfwSetWindowIconifyCallback.
@subsubsection news_30_wndposfun Window position callback
Each window now has a callback for position events, which is set with @ref
glfwSetWindowPosCallback.
@subsubsection news_30_wndpos Window position query
The position of a window can now be retrieved using @ref glfwGetWindowPos.
@subsubsection news_30_focusfun Window focus callback
Each windows now has a callback for focus events, which is set with @ref
glfwSetWindowFocusCallback.
@subsubsection news_30_enterleave Cursor enter/leave callback
Each window now has a callback for when the mouse cursor enters or leaves its
content area, which is set with @ref glfwSetCursorEnterCallback.
@subsubsection news_30_wndtitle Initial window title
The title of a window is now specified at creation time, as one of the arguments
to @ref glfwCreateWindow.
@subsubsection news_30_hidden Hidden windows
Windows can now be hidden with @ref glfwHideWindow, shown using @ref
glfwShowWindow and created initially hidden with the @ref GLFW_VISIBLE window
hint and attribute. This allows for off-screen rendering in a way compatible
with most drivers, as well as moving a window to a specific position before
showing it.
@subsubsection news_30_undecorated Undecorated windows
Windowed mode windows can now be created without decorations, e.g. things like
a frame, a title bar, with the @ref GLFW_DECORATED window hint and attribute.
This allows for the creation of things like splash screens.
@subsubsection news_30_keymods Modifier key bit masks
[Modifier key bit mask](@ref mods) parameters have been added to the
[mouse button](@ref GLFWmousebuttonfun) and [key](@ref GLFWkeyfun) callbacks.
@subsubsection news_30_scancode Platform-specific scancodes
A scancode parameter has been added to the [key callback](@ref GLFWkeyfun). Keys
that don't have a [key token](@ref keys) still get passed on with the key
parameter set to `GLFW_KEY_UNKNOWN`. These scancodes will vary between machines
and are intended to be used for key bindings.
@subsubsection news_30_jsname Joystick names
The name of a joystick can now be retrieved using @ref glfwGetJoystickName.
@subsubsection news_30_doxygen Doxygen documentation
You are reading it.
*/

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/*!
@page quick_guide Getting started
@tableofcontents
This guide takes you through writing a simple application using GLFW 3. The
application will create a window and OpenGL context, render a rotating triangle
and exit when the user closes the window or presses _Escape_. This guide will
introduce a few of the most commonly used functions, but there are many more.
This guide assumes no experience with earlier versions of GLFW. If you
have used GLFW 2 in the past, read @ref moving_guide, as some functions
behave differently in GLFW 3.
@section quick_steps Step by step
@subsection quick_include Including the GLFW header
In the source files of your application where you use GLFW, you need to include
its header file.
@code
#include <GLFW/glfw3.h>
@endcode
This header provides all the constants, types and function prototypes of the
GLFW API.
By default it also includes the OpenGL header from your development environment.
On some platforms this header only supports older versions of OpenGL. The most
extreme case is Windows, where it typically only supports OpenGL 1.2.
Most programs will instead use an
[extension loader library](@ref context_glext_auto) and include its header.
This example uses files generated by [glad](https://gen.glad.sh/). The GLFW
header can detect most such headers if they are included first and will then not
include the one from your development environment.
@code
#include <glad/gl.h>
#include <GLFW/glfw3.h>
@endcode
To make sure there will be no header conflicts, you can define @ref
GLFW_INCLUDE_NONE before the GLFW header to explicitly disable inclusion of the
development environment header. This also allows the two headers to be included
in any order.
@code
#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>
#include <glad/gl.h>
@endcode
@subsection quick_init_term Initializing and terminating GLFW
Before you can use most GLFW functions, the library must be initialized. On
successful initialization, `GLFW_TRUE` is returned. If an error occurred,
`GLFW_FALSE` is returned.
@code
if (!glfwInit())
{
// Initialization failed
}
@endcode
Note that `GLFW_TRUE` and `GLFW_FALSE` are and will always be one and zero.
When you are done using GLFW, typically just before the application exits, you
need to terminate GLFW.
@code
glfwTerminate();
@endcode
This destroys any remaining windows and releases any other resources allocated by
GLFW. After this call, you must initialize GLFW again before using any GLFW
functions that require it.
@subsection quick_capture_error Setting an error callback
Most events are reported through callbacks, whether it's a key being pressed,
a GLFW window being moved, or an error occurring. Callbacks are C functions (or
C++ static methods) that are called by GLFW with arguments describing the event.
In case a GLFW function fails, an error is reported to the GLFW error callback.
You can receive these reports with an error callback. This function must have
the signature below but may do anything permitted in other callbacks.
@code
void error_callback(int error, const char* description)
{
fprintf(stderr, "Error: %s\n", description);
}
@endcode
Callback functions must be set, so GLFW knows to call them. The function to set
the error callback is one of the few GLFW functions that may be called before
initialization, which lets you be notified of errors both during and after
initialization.
@code
glfwSetErrorCallback(error_callback);
@endcode
@subsection quick_create_window Creating a window and context
The window and its OpenGL context are created with a single call to @ref
glfwCreateWindow, which returns a handle to the created combined window and
context object
@code
GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
if (!window)
{
// Window or OpenGL context creation failed
}
@endcode
This creates a 640 by 480 windowed mode window with an OpenGL context. If
window or OpenGL context creation fails, `NULL` will be returned. You should
always check the return value. While window creation rarely fails, context
creation depends on properly installed drivers and may fail even on machines
with the necessary hardware.
By default, the OpenGL context GLFW creates may have any version. You can
require a minimum OpenGL version by setting the `GLFW_CONTEXT_VERSION_MAJOR` and
`GLFW_CONTEXT_VERSION_MINOR` hints _before_ creation. If the required minimum
version is not supported on the machine, context (and window) creation fails.
@code
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
if (!window)
{
// Window or context creation failed
}
@endcode
The window handle is passed to all window related functions and is provided to
along to all window related callbacks, so they can tell which window received
the event.
When a window and context is no longer needed, destroy it.
@code
glfwDestroyWindow(window);
@endcode
Once this function is called, no more events will be delivered for that window
and its handle becomes invalid.
@subsection quick_context_current Making the OpenGL context current
Before you can use the OpenGL API, you must have a current OpenGL context.
@code
glfwMakeContextCurrent(window);
@endcode
The context will remain current until you make another context current or until
the window owning the current context is destroyed.
If you are using an [extension loader library](@ref context_glext_auto) to
access modern OpenGL then this is when to initialize it, as the loader needs
a current context to load from. This example uses
[glad](https://github.com/Dav1dde/glad), but the same rule applies to all such
libraries.
@code
gladLoadGL(glfwGetProcAddress);
@endcode
@subsection quick_window_close Checking the window close flag
Each window has a flag indicating whether the window should be closed.
When the user attempts to close the window, either by pressing the close widget
in the title bar or using a key combination like Alt+F4, this flag is set to 1.
Note that __the window isn't actually closed__, so you are expected to monitor
this flag and either destroy the window or give some kind of feedback to the
user.
@code
while (!glfwWindowShouldClose(window))
{
// Keep running
}
@endcode
You can be notified when the user is attempting to close the window by setting
a close callback with @ref glfwSetWindowCloseCallback. The callback will be
called immediately after the close flag has been set.
You can also set it yourself with @ref glfwSetWindowShouldClose. This can be
useful if you want to interpret other kinds of input as closing the window, like
for example pressing the _Escape_ key.
@subsection quick_key_input Receiving input events
Each window has a large number of callbacks that can be set to receive all the
various kinds of events. To receive key press and release events, create a key
callback function.
@code
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GLFW_TRUE);
}
@endcode
The key callback, like other window related callbacks, are set per-window.
@code
glfwSetKeyCallback(window, key_callback);
@endcode
In order for event callbacks to be called when events occur, you need to process
events as described below.
@subsection quick_render Rendering with OpenGL
Once you have a current OpenGL context, you can use OpenGL normally. In this
tutorial, a multi-colored rotating triangle will be rendered. The framebuffer
size needs to be retrieved for `glViewport`.
@code
int width, height;
glfwGetFramebufferSize(window, &width, &height);
glViewport(0, 0, width, height);
@endcode
You can also set a framebuffer size callback using @ref
glfwSetFramebufferSizeCallback and be notified when the size changes.
The details of how to render with OpenGL is outside the scope of this tutorial,
but there are many excellent resources for learning modern OpenGL. Here are
a few of them:
- [Anton's OpenGL 4 Tutorials](https://antongerdelan.net/opengl/)
- [Learn OpenGL](https://learnopengl.com/)
- [Open.GL](https://open.gl/)
These all happen to use GLFW, but OpenGL itself works the same whatever API you
use to create the window and context.
@subsection quick_timer Reading the timer
To create smooth animation, a time source is needed. GLFW provides a timer that
returns the number of seconds since initialization. The time source used is the
most accurate on each platform and generally has micro- or nanosecond
resolution.
@code
double time = glfwGetTime();
@endcode
@subsection quick_swap_buffers Swapping buffers
GLFW windows by default use double buffering. That means that each window has
two rendering buffers; a front buffer and a back buffer. The front buffer is
the one being displayed and the back buffer the one you render to.
When the entire frame has been rendered, the buffers need to be swapped with one
another, so the back buffer becomes the front buffer and vice versa.
@code
glfwSwapBuffers(window);
@endcode
The swap interval indicates how many frames to wait until swapping the buffers,
commonly known as _vsync_. By default, the swap interval is zero, meaning
buffer swapping will occur immediately. On fast machines, many of those frames
will never be seen, as the screen is still only updated typically 60-75 times
per second, so this wastes a lot of CPU and GPU cycles.
Also, because the buffers will be swapped in the middle the screen update,
leading to [screen tearing](https://en.wikipedia.org/wiki/Screen_tearing).
For these reasons, applications will typically want to set the swap interval to
one. It can be set to higher values, but this is usually not recommended,
because of the input latency it leads to.
@code
glfwSwapInterval(1);
@endcode
This function acts on the current context and will fail unless a context is
current.
@subsection quick_process_events Processing events
GLFW needs to communicate regularly with the window system both in order to
receive events and to show that the application hasn't locked up. Event
processing must be done regularly while you have visible windows and is normally
done each frame after buffer swapping.
There are two methods for processing pending events; polling and waiting. This
example will use event polling, which processes only those events that have
already been received and then returns immediately.
@code
glfwPollEvents();
@endcode
This is the best choice when rendering continually, like most games do. If
instead you only need to update your rendering once you have received new input,
@ref glfwWaitEvents is a better choice. It waits until at least one event has
been received, putting the thread to sleep in the meantime, and then processes
all received events. This saves a great deal of CPU cycles and is useful for,
for example, many kinds of editing tools.
@section quick_example Putting it together
Now that you know how to initialize GLFW, create a window and poll for
keyboard input, it's possible to create a simple program.
This program creates a 640 by 480 windowed mode window and starts a loop that
clears the screen, renders a triangle and processes events until the user either
presses _Escape_ or closes the window.
@snippet simple.c code
The program above can be found in the
[source package](https://www.glfw.org/download.html) as `examples/simple.c`
and is compiled along with all other examples when you build GLFW. If you
built GLFW from the source package then you already have this as `simple.exe` on
Windows, `simple` on Linux or `simple.app` on macOS.
This tutorial used only a few of the many functions GLFW provides. There are
guides for each of the areas covered by GLFW. Each guide will introduce all the
functions for that category.
- @ref intro_guide
- @ref window_guide
- @ref context_guide
- @ref monitor_guide
- @ref input_guide
You can access reference documentation for any GLFW function by clicking it and
the reference for each function links to related functions and guide sections.
The tutorial ends here. Once you have written a program that uses GLFW, you
will need to compile and link it. How to do that depends on the development
environment you are using and is best explained by the documentation for that
environment. To learn about the details that are specific to GLFW, see
@ref build_guide.
*/

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/*!
@page vulkan_guide Vulkan guide
@tableofcontents
This guide is intended to fill the gaps between the official [Vulkan
resources](https://www.khronos.org/vulkan/) and the rest of the GLFW
documentation and is not a replacement for either. It assumes some familiarity
with Vulkan concepts like loaders, devices, queues and surfaces and leaves it to
the Vulkan documentation to explain the details of Vulkan functions.
To develop for Vulkan you should download the [LunarG Vulkan
SDK](https://vulkan.lunarg.com/) for your platform. Apart from headers and link
libraries, they also provide the validation layers necessary for development.
The [Vulkan Tutorial](https://vulkan-tutorial.com/) has more information on how
to use GLFW and Vulkan. The [Khronos Vulkan
Samples](https://github.com/KhronosGroup/Vulkan-Samples) also use GLFW, although
with a small framework in between.
For details on a specific Vulkan support function, see the @ref vulkan. There
are also guides for the other areas of the GLFW API.
- @ref intro_guide
- @ref window_guide
- @ref context_guide
- @ref monitor_guide
- @ref input_guide
@section vulkan_loader Linking against the Vulkan loader
By default, GLFW will look for the Vulkan loader on demand at runtime via its
standard name (`vulkan-1.dll` on Windows, `libvulkan.so.1` on Linux and other
Unix-like systems and `libvulkan.1.dylib` on macOS). This means that GLFW does
not need to be linked against the loader. However, it also means that if you
are using the static library form of the Vulkan loader GLFW will either fail to
find it or (worse) use the wrong one.
The @ref GLFW_VULKAN_STATIC CMake option makes GLFW call the Vulkan loader
directly instead of dynamically loading it at runtime. Not linking against the
Vulkan loader will then be a compile-time error.
@macos Because the Vulkan loader and ICD are not installed globally on macOS,
you need to set up the application bundle according to the LunarG SDK
documentation. This is explained in more detail in the
[SDK documentation for macOS](https://vulkan.lunarg.com/doc/sdk/latest/mac/getting_started.html).
@section vulkan_include Including the Vulkan and GLFW header files
To include the Vulkan header, define @ref GLFW_INCLUDE_VULKAN before including
the GLFW header.
@code
#define GLFW_INCLUDE_VULKAN
#include <GLFW/glfw3.h>
@endcode
If you instead want to include the Vulkan header from a custom location or use
your own custom Vulkan header then do this before the GLFW header.
@code
#include <path/to/vulkan.h>
#include <GLFW/glfw3.h>
@endcode
Unless a Vulkan header is included, either by the GLFW header or above it, any
GLFW functions that take or return Vulkan types will not be declared.
The `VK_USE_PLATFORM_*_KHR` macros do not need to be defined for the Vulkan part
of GLFW to work. Define them only if you are using these extensions directly.
@section vulkan_support Querying for Vulkan support
If you are linking directly against the Vulkan loader then you can skip this
section. The canonical desktop loader library exports all Vulkan core and
Khronos extension functions, allowing them to be called directly.
If you are loading the Vulkan loader dynamically instead of linking directly
against it, you can check for the availability of a loader and ICD with @ref
glfwVulkanSupported.
@code
if (glfwVulkanSupported())
{
// Vulkan is available, at least for compute
}
@endcode
This function returns `GLFW_TRUE` if the Vulkan loader and any minimally
functional ICD was found.
If one or both were not found, calling any other Vulkan related GLFW function
will generate a @ref GLFW_API_UNAVAILABLE error.
@subsection vulkan_proc Querying Vulkan function pointers
To load any Vulkan core or extension function from the found loader, call @ref
glfwGetInstanceProcAddress. To load functions needed for instance creation,
pass `NULL` as the instance.
@code
PFN_vkCreateInstance pfnCreateInstance = (PFN_vkCreateInstance)
glfwGetInstanceProcAddress(NULL, "vkCreateInstance");
@endcode
Once you have created an instance, you can load from it all other Vulkan core
functions and functions from any instance extensions you enabled.
@code
PFN_vkCreateDevice pfnCreateDevice = (PFN_vkCreateDevice)
glfwGetInstanceProcAddress(instance, "vkCreateDevice");
@endcode
This function in turn calls `vkGetInstanceProcAddr`. If that fails, the
function falls back to a platform-specific query of the Vulkan loader (i.e.
`dlsym` or `GetProcAddress`). If that also fails, the function returns `NULL`.
For more information about `vkGetInstanceProcAddr`, see the Vulkan
documentation.
Vulkan also provides `vkGetDeviceProcAddr` for loading device-specific versions
of Vulkan function. This function can be retrieved from an instance with @ref
glfwGetInstanceProcAddress.
@code
PFN_vkGetDeviceProcAddr pfnGetDeviceProcAddr = (PFN_vkGetDeviceProcAddr)
glfwGetInstanceProcAddress(instance, "vkGetDeviceProcAddr");
@endcode
Device-specific functions may execute a little bit faster, due to not having to
dispatch internally based on the device passed to them. For more information
about `vkGetDeviceProcAddr`, see the Vulkan documentation.
@section vulkan_ext Querying required Vulkan extensions
To do anything useful with Vulkan you need to create an instance. If you want
to use Vulkan to render to a window, you must enable the instance extensions
GLFW requires to create Vulkan surfaces.
To query the instance extensions required, call @ref
glfwGetRequiredInstanceExtensions.
@code
uint32_t count;
const char** extensions = glfwGetRequiredInstanceExtensions(&count);
@endcode
These extensions must all be enabled when creating instances that are going to
be passed to @ref glfwGetPhysicalDevicePresentationSupport and @ref
glfwCreateWindowSurface. The set of extensions will vary depending on platform
and may also vary depending on graphics drivers and other factors.
If it fails it will return `NULL` and GLFW will not be able to create Vulkan
window surfaces. You can still use Vulkan for off-screen rendering and compute
work.
If successful the returned array will always include `VK_KHR_surface`, so if
you don't require any additional extensions you can pass this list directly to
the `VkInstanceCreateInfo` struct.
@code
VkInstanceCreateInfo ici;
memset(&ici, 0, sizeof(ici));
ici.enabledExtensionCount = count;
ici.ppEnabledExtensionNames = extensions;
...
@endcode
Additional extensions may be required by future versions of GLFW. You should
check whether any extensions you wish to enable are already in the returned
array, as it is an error to specify an extension more than once in the
`VkInstanceCreateInfo` struct.
@section vulkan_present Querying for Vulkan presentation support
Not every queue family of every Vulkan device can present images to surfaces.
To check whether a specific queue family of a physical device supports image
presentation without first having to create a window and surface, call @ref
glfwGetPhysicalDevicePresentationSupport.
@code
if (glfwGetPhysicalDevicePresentationSupport(instance, physical_device, queue_family_index))
{
// Queue family supports image presentation
}
@endcode
The `VK_KHR_surface` extension additionally provides the
`vkGetPhysicalDeviceSurfaceSupportKHR` function, which performs the same test on
an existing Vulkan surface.
@section vulkan_window Creating the window
Unless you will be using OpenGL or OpenGL ES with the same window as Vulkan,
there is no need to create a context. You can disable context creation with the
[GLFW_CLIENT_API](@ref GLFW_CLIENT_API_hint) hint.
@code
glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
GLFWwindow* window = glfwCreateWindow(640, 480, "Window Title", NULL, NULL);
@endcode
See @ref context_less for more information.
@section vulkan_surface Creating a Vulkan window surface
You can create a Vulkan surface (as defined by the `VK_KHR_surface` extension)
for a GLFW window with @ref glfwCreateWindowSurface.
@code
VkSurfaceKHR surface;
VkResult err = glfwCreateWindowSurface(instance, window, NULL, &surface);
if (err)
{
// Window surface creation failed
}
@endcode
If an OpenGL or OpenGL ES context was created on the window, the context has
ownership of the presentation on the window and a Vulkan surface cannot be
created.
It is your responsibility to destroy the surface. GLFW does not destroy it for
you. Call `vkDestroySurfaceKHR` function from the same extension to destroy it.
*/

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