[nostalgia] Add scaffolding for ImGui

.gitignore

@@ -1,6 +1,7 @@
 .clangd
 .current_build
 scripts/__pycache__
+deps/imgui/src
 compile_commands.json
 build
 .conanbuild

CMakeLists.txt

@@ -44,12 +44,19 @@ else()
 endif()
 
 add_subdirectory(deps/ox)
-include_directories(SYSTEM deps/ox/src)
+include_directories(
+	SYSTEM
+		deps/imgui/src
+		deps/ox/src
+)
 
 if(BUILDCORE_TARGET STREQUAL "gba")
 	add_subdirectory(deps/gbastartup)
-elseif(NOSTALGIA_BUILD_STUDIO)
+else()
-	add_subdirectory(deps/QDark)
+	if(NOSTALGIA_BUILD_STUDIO)
+		add_subdirectory(deps/QDark)
+	endif()
+	add_subdirectory(deps/imgui)
 endif()
 
 add_subdirectory(src)

conanfile.py

@@ -2,7 +2,13 @@ from conans import ConanFile, CMake
 
 class NostalgiaConan(ConanFile):
     settings = 'os', 'compiler', 'build_type', 'arch'
-    requires = 'jsoncpp/1.9.4', 'glfw/3.3.4'
+    requires = 'jsoncpp/1.9.4', 'glfw/3.3.4', 'imgui/1.82'
     generators = 'cmake', 'cmake_find_package', 'cmake_paths'
     default_options = {
     }
+
+    def imports(self):
+        self.copy('imgui_impl_glfw.cpp',    dst='../deps/imgui/src', src='./res/bindings')
+        self.copy('imgui_impl_opengl3.cpp', dst='../deps/imgui/src', src='./res/bindings')
+        self.copy('imgui_impl_glfw.h',      dst='../deps/imgui/src', src='./res/bindings')
+        self.copy('imgui_impl_opengl3.h',   dst='../deps/imgui/src', src='./res/bindings')

deps/imgui/CMakeLists.txt

@@ -0,0 +1,40 @@
+add_library(
+	imgui-glfw
+		src/imgui_impl_glfw.cpp
+		src/imgui_impl_opengl3.cpp
+)
+
+find_package(glfw3 REQUIRED)
+find_package(imgui REQUIRED)
+
+if(APPLE)
+	target_compile_definitions(
+		imgui-glfw PRIVATE
+			IMGUI_IMPL_OPENGL_LOADER_CUSTOM="OpenGL/gl3.h"
+	)
+endif()
+
+target_link_libraries(
+	imgui-glfw PUBLIC
+		${OPENGL_gl_LIBRARY}
+		glfw::glfw
+		imgui::imgui
+)
+
+if(NOT MSVC)
+	target_compile_options(
+		imgui-glfw PRIVATE
+			-Wno-all
+			-Wno-extra
+			-Wno-old-style-cast
+			-Wno-deprecated-declarations
+	)
+endif()
+
+install(
+	TARGETS
+		imgui-glfw
+	DESTINATION
+		LIBRARY DESTINATION lib/nostalgia
+		ARCHIVE DESTINATION lib/nostalgia
+)

src/nostalgia/core/glfw/CMakeLists.txt

@@ -5,10 +5,20 @@ add_library(
 )
 
 find_package(glfw3 REQUIRED)
+find_package(imgui REQUIRED)
+
+if(APPLE)
+	find_package(OpenGL REQUIRED)
+else()
+	set(OPENGL_gl_LIBRARY GL)
+endif()
 
 target_link_libraries(
 	NostalgiaCore-GLFW PUBLIC
+		${OPENGL_gl_LIBRARY}
 		glfw::glfw
+		imgui::imgui
+		imgui-glfw
 		NostalgiaGlUtils
 		NostalgiaCore-Userspace
 )

src/nostalgia/core/glfw/core.hpp

@@ -13,7 +13,7 @@
 namespace nostalgia::core {
 
 struct GlfwImplData {
-	class GLFWwindow *window = nullptr;
+	struct GLFWwindow *window = nullptr;
 	int64_t startTime = 0;
 	bool running = false;
 	event_handler eventHandler = nullptr;

src/nostalgia/core/glfw/gfx.cpp

@@ -7,6 +7,8 @@
  */
 
 #include <GLFW/glfw3.h>
+#include <imgui.h>
+#include <imgui_impl_glfw.h>
 
 #include <nostalgia/core/userland/gfx.hpp>
 
@@ -37,6 +39,7 @@ ox::Error initGfx(Context *ctx) noexcept {
 	glfwSetWindowUserPointer(id->window, ctx);
 	glfwMakeContextCurrent(id->window);
 	oxReturnError(renderer::init(ctx));
+	ImGui_ImplGlfw_InitForOpenGL(id->window, true);
 	return OxError(0);
 }