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Backends: OpenGL3: Embed our own minimal GL loader based on gl3w and use it in SDL/GLFW examples. (#4445)
Loader repository at https://github.com/dearimgui/gl3w_stripped Removed support for using custom loaders in examples/opengl3 backend
This commit is contained in:
Rokas Kupstys
ocornut
@ -31,35 +31,6 @@ LIBS =
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## OPENGL LOADER / OPENGL ES
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##---------------------------------------------------------------------
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## See below for OpenGL ES option (no loader required) - comment out
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## the following if you want to use OpenGL ES instead of Desktop GL.
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## Using OpenGL loader: gl3w [default]
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SOURCES += ../libs/gl3w/GL/gl3w.c
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CXXFLAGS += -I../libs/gl3w -DIMGUI_IMPL_OPENGL_LOADER_GL3W
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## Using OpenGL loader: glew
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## (This assumes a system-wide installation)
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# CXXFLAGS += -DIMGUI_IMPL_OPENGL_LOADER_GLEW
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# LIBS += -lGLEW
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## Using OpenGL loader: glad
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# SOURCES += ../libs/glad/src/glad.c
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# CXXFLAGS += -I../libs/glad/include -DIMGUI_IMPL_OPENGL_LOADER_GLAD
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## Using OpenGL loader: glad2
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# SOURCES += ../libs/glad/src/gl.c
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# CXXFLAGS += -I../libs/glad/include -DIMGUI_IMPL_OPENGL_LOADER_GLAD2
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## Using OpenGL loader: glbinding
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## This assumes a system-wide installation
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## of either version 3.0.0 (or newer)
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# CXXFLAGS += -DIMGUI_IMPL_OPENGL_LOADER_GLBINDING3
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# LIBS += -lglbinding
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## or the older version 2.x
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# CXXFLAGS += -DIMGUI_IMPL_OPENGL_LOADER_GLBINDING2
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# LIBS += -lglbinding
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## Using OpenGL ES, no loader required
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## This assumes a GL ES library available in the system, e.g. libGLESv2.so
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# CXXFLAGS += -DIMGUI_IMPL_OPENGL_ES2
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@ -90,7 +90,7 @@
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<ClCompile>
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<WarningLevel>Level4</WarningLevel>
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<Optimization>Disabled</Optimization>
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<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;$(VcpkgCurrentInstalledDir)include\SDL2;..\libs\gl3w;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;$(VcpkgCurrentInstalledDir)include\SDL2;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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</ClCompile>
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<Link>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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@ -104,7 +104,7 @@
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<ClCompile>
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<WarningLevel>Level4</WarningLevel>
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<Optimization>Disabled</Optimization>
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<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;$(VcpkgCurrentInstalledDir)include\SDL2;..\libs\gl3w;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;$(VcpkgCurrentInstalledDir)include\SDL2;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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</ClCompile>
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<Link>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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@ -120,7 +120,7 @@
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;$(VcpkgCurrentInstalledDir)include\SDL2;..\libs\gl3w;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;$(VcpkgCurrentInstalledDir)include\SDL2;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<BufferSecurityCheck>false</BufferSecurityCheck>
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</ClCompile>
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<Link>
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@ -140,7 +140,7 @@
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;$(VcpkgCurrentInstalledDir)include\SDL2;..\libs\gl3w;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;$(VcpkgCurrentInstalledDir)include\SDL2;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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<BufferSecurityCheck>false</BufferSecurityCheck>
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</ClCompile>
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<Link>
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@ -162,7 +162,6 @@
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<ClCompile Include="..\..\imgui_widgets.cpp" />
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<ClCompile Include="..\..\backends\imgui_impl_opengl3.cpp" />
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<ClCompile Include="..\..\backends\imgui_impl_sdl.cpp" />
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<ClCompile Include="..\libs\gl3w\GL\gl3w.c" />
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<ClCompile Include="main.cpp" />
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</ItemGroup>
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<ItemGroup>
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@ -170,9 +169,8 @@
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<ClInclude Include="..\..\imgui.h" />
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<ClInclude Include="..\..\imgui_internal.h" />
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<ClInclude Include="..\..\backends\imgui_impl_opengl3.h" />
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<ClInclude Include="..\..\backends\imgui_impl_opengl3_loader.h" />
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<ClInclude Include="..\..\backends\imgui_impl_sdl.h" />
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<ClInclude Include="..\libs\gl3w\GL\gl3w.h" />
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<ClInclude Include="..\libs\gl3w\GL\glcorearb.h" />
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</ItemGroup>
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<ItemGroup>
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<None Include="..\..\misc\debuggers\imgui.natvis" />
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@ -181,4 +179,4 @@
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
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<ImportGroup Label="ExtensionTargets">
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</ImportGroup>
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</Project>
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</Project>
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@ -8,9 +8,6 @@
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<UniqueIdentifier>{f18ab499-84e1-499f-8eff-9754361e0e52}</UniqueIdentifier>
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<Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
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</Filter>
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<Filter Include="gl3w">
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<UniqueIdentifier>{f9997b32-5479-4756-9ffc-77793ad3764f}</UniqueIdentifier>
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</Filter>
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</ItemGroup>
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<ItemGroup>
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<ClCompile Include="..\..\imgui.cpp">
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@ -25,9 +22,6 @@
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<ClCompile Include="main.cpp">
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<Filter>sources</Filter>
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</ClCompile>
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<ClCompile Include="..\libs\gl3w\GL\gl3w.c">
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<Filter>gl3w</Filter>
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</ClCompile>
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<ClCompile Include="..\..\backends\imgui_impl_opengl3.cpp">
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<Filter>sources</Filter>
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</ClCompile>
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@ -51,15 +45,12 @@
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<ClInclude Include="..\..\imgui_internal.h">
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<Filter>imgui</Filter>
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</ClInclude>
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<ClInclude Include="..\libs\gl3w\GL\gl3w.h">
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<Filter>gl3w</Filter>
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</ClInclude>
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<ClInclude Include="..\libs\gl3w\GL\glcorearb.h">
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<Filter>gl3w</Filter>
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</ClInclude>
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<ClInclude Include="..\..\backends\imgui_impl_opengl3.h">
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<Filter>sources</Filter>
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</ClInclude>
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<ClInclude Include="..\..\backends\imgui_impl_opengl3_loader.h">
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<Filter>sources</Filter>
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</ClInclude>
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<ClInclude Include="..\..\backends\imgui_impl_sdl.h">
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<Filter>sources</Filter>
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</ClInclude>
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@ -9,33 +9,10 @@
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#include "imgui_impl_opengl3.h"
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#include <stdio.h>
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#include <SDL.h>
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#include <SDL_opengl.h>
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#if defined(IMGUI_IMPL_OPENGL_ES2)
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#include <GLES2/gl2.h>
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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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#elif 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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#include <GL/glew.h> // Initialize with glewInit()
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
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#include <glad/glad.h> // Initialize with gladLoadGL()
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
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#include <glad/gl.h> // Initialize with gladLoadGL(...) or gladLoaderLoadGL()
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
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#define GLFW_INCLUDE_NONE // GLFW including OpenGL headers causes ambiguity or multiple definition errors.
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#include <glbinding/Binding.h> // Initialize with glbinding::Binding::initialize()
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#include <glbinding/gl/gl.h>
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using namespace gl;
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
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#define GLFW_INCLUDE_NONE // GLFW including OpenGL headers causes ambiguity or multiple definition errors.
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#include <glbinding/glbinding.h>// Initialize with glbinding::initialize()
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#include <glbinding/gl/gl.h>
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using namespace gl;
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#else
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#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
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#include <SDL_opengles2.h>
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#endif
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// Main code
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@ -84,30 +61,6 @@ int main(int, char**)
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SDL_GL_MakeCurrent(window, gl_context);
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SDL_GL_SetSwapInterval(1); // Enable vsync
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// Initialize OpenGL loader
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#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
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bool err = gl3wInit() != 0;
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
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bool err = glewInit() != GLEW_OK;
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
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bool err = gladLoadGL() == 0;
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
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bool err = gladLoadGL((GLADloadfunc)SDL_GL_GetProcAddress) == 0; // glad2 recommend using the windowing library loader instead of the (optionally) bundled one.
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
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bool err = false;
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glbinding::Binding::initialize();
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
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bool err = false;
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glbinding::initialize([](const char* name) { return (glbinding::ProcAddress)SDL_GL_GetProcAddress(name); });
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#else
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bool err = false; // If you use IMGUI_IMPL_OPENGL_LOADER_CUSTOM, your loader is likely to requires some form of initialization.
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#endif
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if (err)
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{
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fprintf(stderr, "Failed to initialize OpenGL loader!\n");
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return 1;
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}
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// Setup Dear ImGui context
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IMGUI_CHECKVERSION();
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ImGui::CreateContext();
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