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Backends: OpenGL3: Embed our own minimal GL loader (amends). (#4445)

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ocornut 3 years ago
parent 459de65477
commit e3988a84db
15 changed files with 41 additions and 75 deletions
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22
backends/imgui_impl_opengl3.cpp
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@ -14,6 +14,7 @@
// CHANGELOG // CHANGELOG
// (minor and older changes stripped away, please see git history for details) // (minor and older changes stripped away, please see git history for details)
// 2021-08-19: OpenGL: Embed and use our own minimal GL loader (imgui_impl_opengl3_loader.h), removing requirement and support for third-party loader.
// 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX). // 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
// 2021-06-25: OpenGL: Use OES_vertex_array extension on Emscripten + backup/restore current state. // 2021-06-25: OpenGL: Use OES_vertex_array extension on Emscripten + backup/restore current state.
// 2021-06-21: OpenGL: Destroy individual vertex/fragment shader objects right after they are linked into the main shader. // 2021-06-21: OpenGL: Destroy individual vertex/fragment shader objects right after they are linked into the main shader.
@ -108,16 +109,15 @@
#else #else
#include <GLES3/gl3.h> // Use GL ES 3 #include <GLES3/gl3.h> // Use GL ES 3
#endif #endif
#else #elif !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
// About Desktop OpenGL function loaders:
// Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers. // Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
// Helper libraries are often used for this purpose! Here we are using our own minimal custom loader based on gl3w. // Helper libraries are often used for this purpose! Here we are using our own minimal custom loader based on gl3w.
// You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own. // In the rest of your app/engine, you can use another loader of your choice (gl3w, glew, glad, glbinding, glext, glLoadGen, etc.).
// If you happen to be developing a new feature for this backend, you may want to get a unstripped version of // If you happen to be developing a new feature for this backend (imgui_impl_opengl3.cpp):
// imgui_impl_opengl3_loader.h from https://github.com/dearimgui/gl3w_stripped/releases/ and use that temporarily. // - You may need to regenerate imgui_impl_opengl3_loader.h to add new symbols. See https://github.com/dearimgui/gl3w_stripped
// When done, changes using new APIs should be accompanied by regenerated stripped loader version (instructions in // - You can temporarily use an unstripped version. See https://github.com/dearimgui/gl3w_stripped/releases
// gl3w_stripped README.rst). // Changes to this backend using new APIs should be accompanied by a regenerated stripped loader version.
#define IMGL3W_IMPL 1 #define IMGL3W_IMPL
#include "imgui_impl_opengl3_loader.h" #include "imgui_impl_opengl3_loader.h"
#endif #endif
@ -188,6 +188,7 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
ImGuiIO& io = ImGui::GetIO(); ImGuiIO& io = ImGui::GetIO();
IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!"); IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
// Initialize our loader
#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) #if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3)
if (imgl3wInit() != 0) if (imgl3wInit() != 0)
{ {
@ -241,6 +242,11 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
strcpy(bd->GlslVersionString, glsl_version); strcpy(bd->GlslVersionString, glsl_version);
strcat(bd->GlslVersionString, "\n"); strcat(bd->GlslVersionString, "\n");
// Make an arbitrary GL call (we don't actually need the result)
// IF YOU GET A CRASH HERE: it probably means the OpenGL function loader didn't do its job. Let us know!
GLint current_texture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_texture);
// Detect extensions we support // Detect extensions we support
bd->HasClipOrigin = (bd->GlVersion >= 450); bd->HasClipOrigin = (bd->GlVersion >= 450);
#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS #ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS

5
backends/imgui_impl_opengl3.h
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@ -12,11 +12,6 @@
// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
// Read online: https://github.com/ocornut/imgui/tree/master/docs // Read online: https://github.com/ocornut/imgui/tree/master/docs
// About Desktop OpenGL function loaders:
// Modern Desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
// Helper libraries are often used for this purpose! Here we are supporting a few common ones (gl3w, glew, glad).
// You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
// About GLSL version: // About GLSL version:
// The 'glsl_version' initialization parameter should be NULL (default) or a "#version XXX" string. // The 'glsl_version' initialization parameter should be NULL (default) or a "#version XXX" string.
// On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es" // On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es"

9
docs/CHANGELOG.txt
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@ -54,6 +54,7 @@ Breaking Changes:
This is unfortunately a global SDL setting, so enabling it _might_ have a side-effect on your application. This is unfortunately a global SDL setting, so enabling it _might_ have a side-effect on your application.
It is unlikely to make a difference, but if your app absolutely needs to ignore the initial on-focus click: It is unlikely to make a difference, but if your app absolutely needs to ignore the initial on-focus click:
you can ignore SDL_MOUSEBUTTONDOWN that events coming right after a SDL_WINDOWEVENT_FOCUS_GAINED event). you can ignore SDL_MOUSEBUTTONDOWN that events coming right after a SDL_WINDOWEVENT_FOCUS_GAINED event).
- Backends: OpenGL3: added a third source file "imgui_impl_opengl3_loader.h". [@rokups]
- Internals: (for custom widgets): because disabled items now sets HoveredId, if you want custom widgets to - Internals: (for custom widgets): because disabled items now sets HoveredId, if you want custom widgets to
not react as hovered when disabled, in the majority of use cases it is preferable to check the "hovered" not react as hovered when disabled, in the majority of use cases it is preferable to check the "hovered"
return value of ButtonBehavior() rather than (HoveredId == id). return value of ButtonBehavior() rather than (HoveredId == id).
@ -119,6 +120,10 @@ Other Changes:
- Backends: DX9: Explicitly disable texture state stages after >= 1. (#4268) [@NZJenkins] - Backends: DX9: Explicitly disable texture state stages after >= 1. (#4268) [@NZJenkins]
- Backends: DX12: Fix texture casting crash on 32-bit systems (introduced on 2021/05/19 and v1.83) + added comments - Backends: DX12: Fix texture casting crash on 32-bit systems (introduced on 2021/05/19 and v1.83) + added comments
about building on 32-bit systems. (#4225) [@kingofthebongo2008] about building on 32-bit systems. (#4225) [@kingofthebongo2008]
- Backends: OpenGL3: Embed our own minimal GL headers/loader (imgui_impl_opengl3_loader.h) based on gl3w.
Reduces the frequent issues and confusion coming from having to support multiple loaders and requiring users to use and
initialize the same loader as the backend. [@rokups]
Removed support for gl3w, glew, glad, glad2, glbinding2, glbinding3 (all now unnecessary).
- Backends: OpenGL3: Handle GL_CLIP_ORIGIN on <4.5 contexts if "GL_ARB_clip_control" extension is detected. (#4170, #3998) - Backends: OpenGL3: Handle GL_CLIP_ORIGIN on <4.5 contexts if "GL_ARB_clip_control" extension is detected. (#4170, #3998)
- Backends: OpenGL3: Destroy vertex/fragment shader objects right after they are linked into main shader. (#4244) [@Crowbarous] - Backends: OpenGL3: Destroy vertex/fragment shader objects right after they are linked into main shader. (#4244) [@Crowbarous]
- Backends: OpenGL3: Use OES_vertex_array extension on Emscripten + backup/restore current state. (#4266, #4267) [@harry75369] - Backends: OpenGL3: Use OES_vertex_array extension on Emscripten + backup/restore current state. (#4266, #4267) [@harry75369]
@ -126,13 +131,11 @@ Other Changes:
- Backends: OSX: Added a fix for shortcuts using CTRL key instead of CMD key. (#4253) [@rokups] - Backends: OSX: Added a fix for shortcuts using CTRL key instead of CMD key. (#4253) [@rokups]
- Examples: DX12: Fixed handling of Alt+Enter in example app (using swapchain's ResizeBuffers). (#4346) [@PathogenDavid] - Examples: DX12: Fixed handling of Alt+Enter in example app (using swapchain's ResizeBuffers). (#4346) [@PathogenDavid]
- Examples: DX12: Removed unecessary recreation of backend-owned device objects when window is resized. (#4347) [@PathogenDavid] - Examples: DX12: Removed unecessary recreation of backend-owned device objects when window is resized. (#4347) [@PathogenDavid]
- Examples: OpenGL3+GLFW,SDL: Remove include cruft to support variety of GL loaders (no longer necessary). [@rokups]
- Examples: OSX+OpenGL2: Fix event forwarding (fix key remaining stuck when using shortcuts with Cmd/Super key). - Examples: OSX+OpenGL2: Fix event forwarding (fix key remaining stuck when using shortcuts with Cmd/Super key).
Other OSX examples were not affected. (#4253, #1873) [@rokups] Other OSX examples were not affected. (#4253, #1873) [@rokups]
- Examples: Updated all .vcxproj to VS2015 (toolset v140) to facilitate usage with vcpkg. - Examples: Updated all .vcxproj to VS2015 (toolset v140) to facilitate usage with vcpkg.
- Examples: SDL2: Accomodate for vcpkg install having headers in SDL2/SDL.h vs SDL.h. - Examples: SDL2: Accomodate for vcpkg install having headers in SDL2/SDL.h vs SDL.h.
- Examples: OpenGL3+GLFW/SDL: Added minimal OpenGL loader imgui_impl_opengl3_loader.h and use it in OpenGL3 backend.
Support for using custom OpenGL loader in the backend is removed, IMGUI_IMPL_OPENGL_LOADER_XX (except ES2/ES3) are
no longer used. [@rokups]
----------------------------------------------------------------------- -----------------------------------------------------------------------

15
docs/EXAMPLES.md
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@ -117,21 +117,18 @@ GLFW (Mac) + Metal example. <BR>
[example_glfw_opengl2/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_opengl2/) <BR> [example_glfw_opengl2/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_opengl2/) <BR>
GLFW + OpenGL2 example (legacy, fixed pipeline). <BR> GLFW + OpenGL2 example (legacy, fixed pipeline). <BR>
= main.cpp + imgui_impl_glfw.cpp + imgui_impl_opengl2.cpp <BR> = main.cpp + imgui_impl_glfw.cpp + imgui_impl_opengl2.cpp <BR>
**DO NOT USE OPENGL2 CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)** <BR> **DO NOT USE THIS IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)** <BR>
**Prefer using OPENGL3 code (with gl3w/glew/glad/glad2/glbinding, you can replace the OpenGL function loader)** <BR>
This code is mostly provided as a reference to learn about Dear ImGui integration, because it is shorter. This code is mostly provided as a reference to learn about Dear ImGui integration, because it is shorter.
If your code is using GL3+ context or any semi modern OpenGL calls, using this renderer is likely to If your code is using GL3+ context or any semi modern OpenGL calls, using this renderer is likely to
make things more complicated, will require your code to reset many OpenGL attributes to their initial make things more complicated, will require your code to reset many OpenGL attributes to their initial
state, and might confuse your GPU driver. One star, not recommended. state, and might confuse your GPU driver. One star, not recommended.
[example_glfw_opengl3/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_opengl3/) <BR> [example_glfw_opengl3/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_opengl3/) <BR>
GLFW (Win32, Mac, Linux) + OpenGL3+/ES2/ES3 example (programmable pipeline). <BR> GLFW (Win32, Mac, Linux) + OpenGL3+/ES2/ES3 example (modern, programmable pipeline). <BR>
= main.cpp + imgui_impl_glfw.cpp + imgui_impl_opengl3.cpp <BR> = main.cpp + imgui_impl_glfw.cpp + imgui_impl_opengl3.cpp <BR>
This uses more modern OpenGL calls and custom shaders. <BR> This uses more modern OpenGL calls and custom shaders. <BR>
This may actually also work with OpenGL 2.x contexts! <BR>
Prefer using that if you are using modern OpenGL in your application (anything with shaders). Prefer using that if you are using modern OpenGL in your application (anything with shaders).
(Please be mindful that accessing OpenGL3+ functions requires a function loader, which are a frequent
source for confusion for new users. We use a loader in imgui_impl_opengl3.cpp which may be different
from the one your app normally use. Read imgui_impl_opengl3.h for details and how to change it.)
[example_glfw_vulkan/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_vulkan/) <BR> [example_glfw_vulkan/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_vulkan/) <BR>
GLFW (Win32, Mac, Linux) + Vulkan example. <BR> GLFW (Win32, Mac, Linux) + Vulkan example. <BR>
@ -167,7 +164,6 @@ SDL2 (Mac) + Metal example. <BR>
SDL2 (Win32, Mac, Linux etc.) + OpenGL example (legacy, fixed pipeline). <BR> SDL2 (Win32, Mac, Linux etc.) + OpenGL example (legacy, fixed pipeline). <BR>
= main.cpp + imgui_impl_sdl.cpp + imgui_impl_opengl2.cpp <BR> = main.cpp + imgui_impl_sdl.cpp + imgui_impl_opengl2.cpp <BR>
**DO NOT USE OPENGL2 CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)** <BR> **DO NOT USE OPENGL2 CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)** <BR>
**Prefer using OPENGL3 code (with gl3w/glew/glad/glad2/glbinding, you can replace the OpenGL function loader)** <BR>
This code is mostly provided as a reference to learn about Dear ImGui integration, because it is shorter. This code is mostly provided as a reference to learn about Dear ImGui integration, because it is shorter.
If your code is using GL3+ context or any semi modern OpenGL calls, using this renderer is likely to If your code is using GL3+ context or any semi modern OpenGL calls, using this renderer is likely to
make things more complicated, will require your code to reset many OpenGL attributes to their initial make things more complicated, will require your code to reset many OpenGL attributes to their initial
@ -177,10 +173,7 @@ state, and might confuse your GPU driver. One star, not recommended.
SDL2 (Win32, Mac, Linux, etc.) + OpenGL3+/ES2/ES3 example. <BR> SDL2 (Win32, Mac, Linux, etc.) + OpenGL3+/ES2/ES3 example. <BR>
= main.cpp + imgui_impl_sdl.cpp + imgui_impl_opengl3.cpp <BR> = main.cpp + imgui_impl_sdl.cpp + imgui_impl_opengl3.cpp <BR>
This uses more modern OpenGL calls and custom shaders. <BR> This uses more modern OpenGL calls and custom shaders. <BR>
Prefer using that if you are using modern OpenGL in your application (anything with shaders). This may actually also work with OpenGL 2.x contexts! <BR>
(Please be mindful that accessing OpenGL3+ functions requires a function loader, which are a frequent
source for confusion for new users. We use a loader in imgui_impl_opengl3.cpp which may be different
from the one your app normally use. Read imgui_impl_opengl3.h for details and how to change it.)
[example_sdl_vulkan/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_vulkan/) <BR> [example_sdl_vulkan/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_vulkan/) <BR>
SDL2 (Win32, Mac, Linux, etc.) + Vulkan example. <BR> SDL2 (Win32, Mac, Linux, etc.) + Vulkan example. <BR>

1
docs/TODO.txt
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@ -391,7 +391,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
- backends: opengl: rename imgui_impl_opengl2 to impl_opengl_legacy and imgui_impl_opengl3 to imgui_impl_opengl? (#1900) - backends: opengl: rename imgui_impl_opengl2 to impl_opengl_legacy and imgui_impl_opengl3 to imgui_impl_opengl? (#1900)
- backends: opengl: could use a single vertex buffer and glBufferSubData for uploads? - backends: opengl: could use a single vertex buffer and glBufferSubData for uploads?
- backends: opengl: explicitly disable GL_STENCIL_TEST in bindings. - backends: opengl: explicitly disable GL_STENCIL_TEST in bindings.
- backends: opengl: consider gl_lite loader https://github.com/ApoorvaJ/Papaya/blob/3808e39b0f45d4ca4972621c847586e4060c042a/src/libs/gl_lite.h
- backends: vulkan: viewport: support for synchronized swapping of multiple swap chains. - backends: vulkan: viewport: support for synchronized swapping of multiple swap chains.
- backends: bgfx: https://gist.github.com/RichardGale/6e2b74bc42b3005e08397236e4be0fd0 - backends: bgfx: https://gist.github.com/RichardGale/6e2b74bc42b3005e08397236e4be0fd0
- backends: mscriptem: with refactored examples, we could provide a direct imgui_impl_emscripten platform layer (see eg. https://github.com/floooh/sokol-samples/blob/master/html5/imgui-emsc.cc#L42) - backends: mscriptem: with refactored examples, we could provide a direct imgui_impl_emscripten platform layer (see eg. https://github.com/floooh/sokol-samples/blob/master/html5/imgui-emsc.cc#L42)

4
examples/example_allegro5/example_allegro5.vcxproj
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@ -120,7 +120,7 @@
<Optimization>MaxSpeed</Optimization> <Optimization>MaxSpeed</Optimization>
<FunctionLevelLinking>true</FunctionLevelLinking> <FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions> <IntrinsicFunctions>true</IntrinsicFunctions>
<AdditionalIncludeDirectories>..\..;..\..\backends;$(SolutionDir)\libs\gl3w;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories> <AdditionalIncludeDirectories>..\..;..\..\backends;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<BufferSecurityCheck>false</BufferSecurityCheck> <BufferSecurityCheck>false</BufferSecurityCheck>
</ClCompile> </ClCompile>
<Link> <Link>
@ -140,7 +140,7 @@
<Optimization>MaxSpeed</Optimization> <Optimization>MaxSpeed</Optimization>
<FunctionLevelLinking>true</FunctionLevelLinking> <FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions> <IntrinsicFunctions>true</IntrinsicFunctions>
<AdditionalIncludeDirectories>..\..;..\..\backends;$(SolutionDir)\libs\gl3w;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories> <AdditionalIncludeDirectories>..\..;..\..\backends;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<BufferSecurityCheck>false</BufferSecurityCheck> <BufferSecurityCheck>false</BufferSecurityCheck>
</ClCompile> </ClCompile>
<Link> <Link>

2
examples/example_apple_opengl2/example_apple_opengl2.xcodeproj/project.pbxproj
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@ -287,7 +287,6 @@
CODE_SIGN_STYLE = Automatic; CODE_SIGN_STYLE = Automatic;
MACOSX_DEPLOYMENT_TARGET = 10.12; MACOSX_DEPLOYMENT_TARGET = 10.12;
PRODUCT_NAME = "$(TARGET_NAME)"; PRODUCT_NAME = "$(TARGET_NAME)";
SYSTEM_HEADER_SEARCH_PATHS = ../libs/gl3w;
USER_HEADER_SEARCH_PATHS = ../..; USER_HEADER_SEARCH_PATHS = ../..;
}; };
name = Debug; name = Debug;
@ -298,7 +297,6 @@
CODE_SIGN_STYLE = Automatic; CODE_SIGN_STYLE = Automatic;
MACOSX_DEPLOYMENT_TARGET = 10.12; MACOSX_DEPLOYMENT_TARGET = 10.12;
PRODUCT_NAME = "$(TARGET_NAME)"; PRODUCT_NAME = "$(TARGET_NAME)";
SYSTEM_HEADER_SEARCH_PATHS = ../libs/gl3w;
USER_HEADER_SEARCH_PATHS = ../..; USER_HEADER_SEARCH_PATHS = ../..;
}; };
name = Release; name = Release;

3
examples/example_emscripten_opengl3/Makefile
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@ -75,9 +75,6 @@ LDFLAGS += --shell-file shell_minimal.html $(EMS)
%.o:$(IMGUI_DIR)/backends/%.cpp %.o:$(IMGUI_DIR)/backends/%.cpp
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $< $(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
%.o:../libs/gl3w/GL/%.c
$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
all: $(EXE) all: $(EXE)
@echo Build complete for $(EXE) @echo Build complete for $(EXE)

9
examples/example_glfw_opengl3/Makefile
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@ -28,10 +28,9 @@ CXXFLAGS += -g -Wall -Wformat
LIBS = LIBS =
##--------------------------------------------------------------------- ##---------------------------------------------------------------------
## OPENGL LOADER / OPENGL ES ## OPENGL ES
##--------------------------------------------------------------------- ##---------------------------------------------------------------------
## Using OpenGL ES, no loader required
## This assumes a GL ES library available in the system, e.g. libGLESv2.so ## This assumes a GL ES library available in the system, e.g. libGLESv2.so
# CXXFLAGS += -DIMGUI_IMPL_OPENGL_ES2 # CXXFLAGS += -DIMGUI_IMPL_OPENGL_ES2
# LINUX_GL_LIBS = -lGLESv2 # LINUX_GL_LIBS = -lGLESv2
@ -80,12 +79,6 @@ endif
%.o:$(IMGUI_DIR)/backends/%.cpp %.o:$(IMGUI_DIR)/backends/%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $< $(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:../libs/gl3w/GL/%.c
$(CC) $(CFLAGS) -c -o $@ $<
%.o:../libs/glad/src/%.c
$(CC) $(CFLAGS) -c -o $@ $<
all: $(EXE) all: $(EXE)
@echo Build complete for $(ECHO_MESSAGE) @echo Build complete for $(ECHO_MESSAGE)

4
examples/example_glfw_opengl3/build_win32.bat
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@ -1,8 +1,8 @@
@REM Build for Visual Studio compiler. Run your copy of vcvars32.bat or vcvarsall.bat to setup command-line compiler. @REM Build for Visual Studio compiler. Run your copy of vcvars32.bat or vcvarsall.bat to setup command-line compiler.
@set OUT_DIR=Debug @set OUT_DIR=Debug
@set OUT_EXE=example_glfw_opengl3 @set OUT_EXE=example_glfw_opengl3
@set INCLUDES=/I..\.. /I..\..\backends /I..\libs\glfw\include /I..\libs\gl3w @set INCLUDES=/I..\.. /I..\..\backends /I..\libs\glfw\include
@set SOURCES=main.cpp ..\..\backends\imgui_impl_glfw.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c @set SOURCES=main.cpp ..\..\backends\imgui_impl_glfw.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp
@set LIBS=/LIBPATH:..\libs\glfw\lib-vc2010-32 glfw3.lib opengl32.lib gdi32.lib shell32.lib @set LIBS=/LIBPATH:..\libs\glfw\lib-vc2010-32 glfw3.lib opengl32.lib gdi32.lib shell32.lib
mkdir %OUT_DIR% mkdir %OUT_DIR%
cl /nologo /Zi /MD %INCLUDES% %SOURCES% /Fe%OUT_DIR%/%OUT_EXE%.exe /Fo%OUT_DIR%/ /link %LIBS% cl /nologo /Zi /MD %INCLUDES% %SOURCES% /Fe%OUT_DIR%/%OUT_EXE%.exe /Fo%OUT_DIR%/ /link %LIBS%

11
examples/example_glfw_opengl3/main.cpp
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@ -7,19 +7,10 @@
#include "imgui_impl_glfw.h" #include "imgui_impl_glfw.h"
#include "imgui_impl_opengl3.h" #include "imgui_impl_opengl3.h"
#include <stdio.h> #include <stdio.h>
#if defined(IMGUI_IMPL_OPENGL_ES2) #if defined(IMGUI_IMPL_OPENGL_ES2)
#include <GLES2/gl2.h> #include <GLES2/gl2.h>
#else
// About Desktop OpenGL function loaders:
// Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
// Here we are using our own minimal loader based on gl3w. You may use another loader/header of your choice (glext, glLoadGen, etc.),
// or chose to manually implement your own.
#include "imgui_impl_opengl3_loader.h"
#endif #endif
#include <GLFW/glfw3.h> // Will drag system OpenGL headers
// Include glfw3.h after our OpenGL definitions
#include <GLFW/glfw3.h>
// [Win32] Our example includes a copy of glfw3.lib pre-compiled with VS2010 to maximize ease of testing and compatibility with old VS compilers. // [Win32] Our example includes a copy of glfw3.lib pre-compiled with VS2010 to maximize ease of testing and compatibility with old VS compilers.
// To link with VS2010-era libraries, VS2015+ requires linking with legacy_stdio_definitions.lib, which we do using this pragma. // To link with VS2010-era libraries, VS2015+ requires linking with legacy_stdio_definitions.lib, which we do using this pragma.

9
examples/example_sdl_opengl3/Makefile
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@ -28,10 +28,9 @@ CXXFLAGS += -g -Wall -Wformat
LIBS = LIBS =
##--------------------------------------------------------------------- ##---------------------------------------------------------------------
## OPENGL LOADER / OPENGL ES ## OPENGL ES
##--------------------------------------------------------------------- ##---------------------------------------------------------------------
## Using OpenGL ES, no loader required
## This assumes a GL ES library available in the system, e.g. libGLESv2.so ## This assumes a GL ES library available in the system, e.g. libGLESv2.so
# CXXFLAGS += -DIMGUI_IMPL_OPENGL_ES2 # CXXFLAGS += -DIMGUI_IMPL_OPENGL_ES2
# LINUX_GL_LIBS = -lGLESv2 # LINUX_GL_LIBS = -lGLESv2
@ -82,12 +81,6 @@ endif
%.o:$(IMGUI_DIR)/backends/%.cpp %.o:$(IMGUI_DIR)/backends/%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $< $(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:../libs/gl3w/GL/%.c
$(CC) $(CFLAGS) -c -o $@ $<
%.o:../libs/glad/src/%.c
$(CC) $(CFLAGS) -c -o $@ $<
all: $(EXE) all: $(EXE)
@echo Build complete for $(ECHO_MESSAGE) @echo Build complete for $(ECHO_MESSAGE)

8
examples/example_sdl_opengl3/README.md
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@ -9,21 +9,21 @@ Use the provided project file (.vcxproj). Add to solution (imgui_examples.sln) i
``` ```
set SDL2_DIR=path_to_your_sdl2_folder set SDL2_DIR=path_to_your_sdl2_folder
cl /Zi /MD /I.. /I..\.. /I%SDL2_DIR%\include /I..\libs\gl3w main.cpp ..\..\backends\imgui_impl_sdl.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c /FeDebug/example_sdl_opengl3.exe /FoDebug/ /link /libpath:%SDL2_DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console cl /Zi /MD /I.. /I..\.. /I%SDL2_DIR%\include main.cpp ..\..\backends\imgui_impl_sdl.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp /FeDebug/example_sdl_opengl3.exe /FoDebug/ /link /libpath:%SDL2_DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console
# ^^ include paths ^^ source files ^^ output exe ^^ output dir ^^ libraries # ^^ include paths ^^ source files ^^ output exe ^^ output dir ^^ libraries
# or for 64-bit: # or for 64-bit:
cl /Zi /MD /I.. /I..\.. /I%SDL2_DIR%\include /I..\libs\gl3w main.cpp ..\..\backends\imgui_impl_sdl.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c /FeDebug/example_sdl_opengl3.exe /FoDebug/ /link /libpath:%SDL2_DIR%\lib\x64 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console cl /Zi /MD /I.. /I..\.. /I%SDL2_DIR%\include main.cpp ..\..\backends\imgui_impl_sdl.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp /FeDebug/example_sdl_opengl3.exe /FoDebug/ /link /libpath:%SDL2_DIR%\lib\x64 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console
``` ```
- On Linux and similar Unixes - On Linux and similar Unixes
``` ```
c++ `sdl2-config --cflags` -I .. -I ../.. -I ../../backends -I ../libs/gl3w main.cpp ../../backends/imgui_impl_sdl.cpp ../../backends/imgui_impl_opengl3.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -lGL -ldl c++ `sdl2-config --cflags` -I .. -I ../.. -I ../../backends main.cpp ../../backends/imgui_impl_sdl.cpp ../../backends/imgui_impl_opengl3.cpp ../../imgui*.cpp `sdl2-config --libs` -lGL -ldl
``` ```
- On Mac OS X - On Mac OS X
``` ```
brew install sdl2 brew install sdl2
c++ `sdl2-config --cflags` -I .. -I ../.. -I ../../backends -I ../libs/gl3w main.cpp ../../backends/imgui_impl_sdl.cpp ../../backends/imgui_impl_opengl3.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -framework OpenGl -framework CoreFoundation c++ `sdl2-config --cflags` -I .. -I ../.. -I ../../backends main.cpp ../../backends/imgui_impl_sdl.cpp ../../backends/imgui_impl_opengl3.cpp ../../imgui*.cpp `sdl2-config --libs` -framework OpenGl -framework CoreFoundation
``` ```

4
examples/example_sdl_opengl3/build_win32.bat
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@ -1,8 +1,8 @@
@REM Build for Visual Studio compiler. Run your copy of vcvars32.bat or vcvarsall.bat to setup command-line compiler. @REM Build for Visual Studio compiler. Run your copy of vcvars32.bat or vcvarsall.bat to setup command-line compiler.
@set OUT_DIR=Debug @set OUT_DIR=Debug
@set OUT_EXE=example_sdl_opengl3 @set OUT_EXE=example_sdl_opengl3
@set INCLUDES=/I..\.. /I..\..\backends /I%SDL2_DIR%\include /I..\libs\gl3w @set INCLUDES=/I..\.. /I..\..\backends /I%SDL2_DIR%\include
@set SOURCES=main.cpp ..\..\backends\imgui_impl_sdl.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c @set SOURCES=main.cpp ..\..\backends\imgui_impl_sdl.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp
@set LIBS=/LIBPATH:%SDL2_DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib shell32.lib @set LIBS=/LIBPATH:%SDL2_DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib shell32.lib
mkdir %OUT_DIR% mkdir %OUT_DIR%
cl /nologo /Zi /MD %INCLUDES% %SOURCES% /Fe%OUT_DIR%/%OUT_EXE%.exe /Fo%OUT_DIR%/ /link %LIBS% /subsystem:console cl /nologo /Zi /MD %INCLUDES% %SOURCES% /Fe%OUT_DIR%/%OUT_EXE%.exe /Fo%OUT_DIR%/ /link %LIBS% /subsystem:console

2
examples/example_sdl_opengl3/main.cpp
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@ -1,6 +1,5 @@
// Dear ImGui: standalone example application for SDL2 + OpenGL // Dear ImGui: standalone example application for SDL2 + OpenGL
// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.) // (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)
// (GL3W is a helper library to access OpenGL functions since there is no standard header to access modern OpenGL functions easily. Alternatives are GLEW, Glad, etc.)
// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. // If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
// Read online: https://github.com/ocornut/imgui/tree/master/docs // Read online: https://github.com/ocornut/imgui/tree/master/docs
@ -10,7 +9,6 @@
#include <stdio.h> #include <stdio.h>
#include <SDL.h> #include <SDL.h>
#include <SDL_opengl.h> #include <SDL_opengl.h>
#if defined(IMGUI_IMPL_OPENGL_ES2) #if defined(IMGUI_IMPL_OPENGL_ES2)
#include <SDL_opengles2.h> #include <SDL_opengles2.h>
#endif #endif

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