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Backends: OpenGL3: Attempt to automatically detect default GL loader by using __has_include. Followup to 44cd8e3 (#2798)
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omar
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44cd8e39da
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@ -74,6 +74,7 @@ Other Changes:
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usage has never been reported as a problem, so this is merely a touch of overzealous luxury. (#2636)
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- Backends: OpenGL3: Tweaked initialization code allow application calling ImGui_ImplOpenGL3_CreateFontsTexture()
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before ImGui_ImplOpenGL3_NewFrame() if for some reason they wanted.
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- Backends: OpenGL3: Attempt to automatically detect default GL loader by using __has_include. (#2798) [@o-micron]
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- Backends: DX11: Fixed GSGetShader() call not passing an initialized instance count,
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would generally make the debug layer complain (Added in 1.72).
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- Backends: Vulkan: Added support for specifying multisample count.
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@ -7,9 +7,10 @@
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#include "imgui_impl_opengl3.h"
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#include <stdio.h>
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// About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual function pointers to be loaded manually.
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// Helper libraries are often used for this purpose! Here we are supporting a few common ones: gl3w, glew, glad.
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// You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
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// About Desktop OpenGL function loaders:
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// Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
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// Helper libraries are often used for this purpose! Here we are supporting a few common ones (gl3w, glew, glad).
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// You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
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#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
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#include <GL/gl3w.h> // Initialize with gl3wInit()
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
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@ -9,9 +9,10 @@
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#include <stdio.h>
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#include <SDL.h>
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// About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual function pointers to be loaded manually.
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// Helper libraries are often used for this purpose! Here we are supporting a few common ones: gl3w, glew, glad.
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// You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
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// About Desktop OpenGL function loaders:
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// Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
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// Helper libraries are often used for this purpose! Here we are supporting a few common ones (gl3w, glew, glad).
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// You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
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#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
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#include <GL/gl3w.h> // Initialize with gl3wInit()
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
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@ -1,5 +1,5 @@
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// dear imgui: Renderer for modern OpenGL with shaders / programmatic pipeline
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// - Desktop GL: 3.x 4.x
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// - Desktop GL: 2.x 3.x 4.x
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// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
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// This needs to be used along with a Platform Binding (e.g. GLFW, SDL, Win32, custom..)
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@ -13,6 +13,7 @@
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2019-09-22: OpenGL: Detect default GL loader using __has_include compiler facility.
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// 2019-09-16: OpenGL: Tweak initialization code to allow application calling ImGui_ImplOpenGL3_CreateFontsTexture() before the first NewFrame() call.
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// 2019-05-29: OpenGL: Desktop GL only: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
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// 2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
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@ -79,12 +80,21 @@
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// Auto-detect GL version
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#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3)
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#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) || (defined(__ANDROID__))
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#define IMGUI_IMPL_OPENGL_ES3 // iOS, Android -> GL ES 3, "#version 300 es"
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#define IMGUI_IMPL_OPENGL_ES3 // iOS, Android -> GL ES 3, "#version 300 es"
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#undef IMGUI_IMPL_OPENGL_LOADER_GL3W
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#undef IMGUI_IMPL_OPENGL_LOADER_GLEW
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#undef IMGUI_IMPL_OPENGL_LOADER_GLAD
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#undef IMGUI_IMPL_OPENGL_LOADER_CUSTOM
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#elif defined(__EMSCRIPTEN__)
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#define IMGUI_IMPL_OPENGL_ES2 // Emscripten -> GL ES 2, "#version 100"
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#define IMGUI_IMPL_OPENGL_ES2 // Emscripten -> GL ES 2, "#version 100"
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#undef IMGUI_IMPL_OPENGL_LOADER_GL3W
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#undef IMGUI_IMPL_OPENGL_LOADER_GLEW
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#undef IMGUI_IMPL_OPENGL_LOADER_GLAD
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#undef IMGUI_IMPL_OPENGL_LOADER_CUSTOM
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#endif
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#endif
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// GL includes
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#if defined(IMGUI_IMPL_OPENGL_ES2)
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#include <GLES2/gl2.h>
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#elif defined(IMGUI_IMPL_OPENGL_ES3)
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@ -149,6 +159,23 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
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strcpy(g_GlslVersionString, glsl_version);
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strcat(g_GlslVersionString, "\n");
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// Dummy construct to make it easily visible in the IDE and debugger which GL loader has been selected.
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// The code actually never uses the 'gl_loader' variable! It is only here so you can read it!
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// If auto-detection fails or doesn't select the same GL loader file as used by your application,
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// you are likely to get a crash below.
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// You can explicitly select a loader by using '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
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const char* gl_loader = "Unknown";
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IM_UNUSED(gl_loader);
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#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
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gl_loader = "GL3W";
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
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gl_loader = "GLEW";
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
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gl_loader = "GLAD";
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#else IMGUI_IMPL_OPENGL_LOADER_CUSTOM
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gl_loader = "Custom";
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#endif
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// Make a dummy GL call (we don't actually need the result)
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// IF YOU GET A CRASH HERE: it probably means that you haven't initialized the OpenGL function loader used by this code.
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// Desktop OpenGL 3/4 need a function loader. See the IMGUI_IMPL_OPENGL_LOADER_xxx explanation above.
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@ -1,5 +1,5 @@
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// dear imgui: Renderer for modern OpenGL with shaders / programmatic pipeline
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// - Desktop GL: 3.x 4.x
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// - Desktop GL: 2.x 3.x 4.x
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// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
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// This needs to be used along with a Platform Binding (e.g. GLFW, SDL, Win32, custom..)
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@ -23,37 +23,42 @@
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#pragma once
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// Specific OpenGL versions
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//#define IMGUI_IMPL_OPENGL_ES2 // Auto-detected on Emscripten
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//#define IMGUI_IMPL_OPENGL_ES3 // Auto-detected on iOS/Android
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// Set default OpenGL3 loader to be gl3w
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#if !defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) \
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&& !defined(IMGUI_IMPL_OPENGL_LOADER_GLEW) \
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&& !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD) \
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&& !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
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// to avoid problem with non-clang compilers not having this macro.
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#if defined(__has_include)
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// check if the header exists, then automatically define the macros ..
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#if __has_include(<GL/glew.h>)
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#define IMGUI_IMPL_OPENGL_LOADER_GLEW
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#elif __has_include(<glad/glad.h>)
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#define IMGUI_IMPL_OPENGL_LOADER_GLAD
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#else
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#define IMGUI_IMPL_OPENGL_LOADER_GL3W
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#endif
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#else
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#define IMGUI_IMPL_OPENGL_LOADER_GL3W
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#endif
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#endif
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// Backend API
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IMGUI_IMPL_API bool ImGui_ImplOpenGL3_Init(const char* glsl_version = NULL);
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IMGUI_IMPL_API void ImGui_ImplOpenGL3_Shutdown();
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IMGUI_IMPL_API void ImGui_ImplOpenGL3_NewFrame();
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IMGUI_IMPL_API void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data);
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// Called by Init/NewFrame/Shutdown
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// (Optional) Called by Init/NewFrame/Shutdown
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IMGUI_IMPL_API bool ImGui_ImplOpenGL3_CreateFontsTexture();
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IMGUI_IMPL_API void ImGui_ImplOpenGL3_DestroyFontsTexture();
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IMGUI_IMPL_API bool ImGui_ImplOpenGL3_CreateDeviceObjects();
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IMGUI_IMPL_API void ImGui_ImplOpenGL3_DestroyDeviceObjects();
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// Specific OpenGL versions
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//#define IMGUI_IMPL_OPENGL_ES2 // Auto-detected on Emscripten
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//#define IMGUI_IMPL_OPENGL_ES3 // Auto-detected on iOS/Android
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// Desktop OpenGL: attempt to detect default GL loader based on available header files.
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// If auto-detection fails or doesn't select the same GL loader file as used by your application,
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// you are likely to get a crash in ImGui_ImplOpenGL3_Init().
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// You can explicitly select a loader by using '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
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#if !defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) \
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&& !defined(IMGUI_IMPL_OPENGL_LOADER_GLEW) \
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&& !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD) \
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&& !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
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#if defined(__has_include)
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#if __has_include(<GL/glew.h>)
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#define IMGUI_IMPL_OPENGL_LOADER_GLEW
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#elif __has_include(<glad/glad.h>)
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#define IMGUI_IMPL_OPENGL_LOADER_GLAD
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#elif __has_include(<GL/gl3w.h>)
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#define IMGUI_IMPL_OPENGL_LOADER_GL3W
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#else
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#error "Cannot detect OpenGL loader!"
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#endif
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#else
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#define IMGUI_IMPL_OPENGL_LOADER_GL3W // Default to GL3W
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#endif
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#endif
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