[nostalgia] Add scaffolding for ImGui

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);
 }