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

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This commit is contained in:
ocornut
2021-08-19 15:27:22 +02:00
parent 459de65477
commit e3988a84db
15 changed files with 41 additions and 75 deletions
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6
examples/example_allegro5/example_allegro5.vcxproj
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@ -120,7 +120,7 @@
<Optimization>MaxSpeed</Optimization>
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<AdditionalIncludeDirectories>..\..;..\..\backends;$(SolutionDir)\libs\gl3w;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..;..\..\backends;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<BufferSecurityCheck>false</BufferSecurityCheck>
</ClCompile>
<Link>
@ -140,7 +140,7 @@
<Optimization>MaxSpeed</Optimization>
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<AdditionalIncludeDirectories>..\..;..\..\backends;$(SolutionDir)\libs\gl3w;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>..\..;..\..\backends;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<BufferSecurityCheck>false</BufferSecurityCheck>
</ClCompile>
<Link>
@ -177,4 +177,4 @@
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">
</ImportGroup>
</Project>
</Project>

2
examples/example_apple_opengl2/example_apple_opengl2.xcodeproj/project.pbxproj
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@ -287,7 +287,6 @@
CODE_SIGN_STYLE = Automatic;
MACOSX_DEPLOYMENT_TARGET = 10.12;
PRODUCT_NAME = "$(TARGET_NAME)";
SYSTEM_HEADER_SEARCH_PATHS = ../libs/gl3w;
USER_HEADER_SEARCH_PATHS = ../..;
};
name = Debug;
@ -298,7 +297,6 @@
CODE_SIGN_STYLE = Automatic;
MACOSX_DEPLOYMENT_TARGET = 10.12;
PRODUCT_NAME = "$(TARGET_NAME)";
SYSTEM_HEADER_SEARCH_PATHS = ../libs/gl3w;
USER_HEADER_SEARCH_PATHS = ../..;
};
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
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
%.o:../libs/gl3w/GL/%.c
$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
all: $(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 =
##---------------------------------------------------------------------
## 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
# CXXFLAGS += -DIMGUI_IMPL_OPENGL_ES2
# LINUX_GL_LIBS = -lGLESv2
@ -80,12 +79,6 @@ endif
%.o:$(IMGUI_DIR)/backends/%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:../libs/gl3w/GL/%.c
$(CC) $(CFLAGS) -c -o $@ $<
%.o:../libs/glad/src/%.c
$(CC) $(CFLAGS) -c -o $@ $<
all: $(EXE)
@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.
@set OUT_DIR=Debug
@set OUT_EXE=example_glfw_opengl3
@set INCLUDES=/I..\.. /I..\..\backends /I..\libs\glfw\include /I..\libs\gl3w
@set SOURCES=main.cpp ..\..\backends\imgui_impl_glfw.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c
@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
@set LIBS=/LIBPATH:..\libs\glfw\lib-vc2010-32 glfw3.lib opengl32.lib gdi32.lib shell32.lib
mkdir %OUT_DIR%
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_opengl3.h"
#include <stdio.h>
#if defined(IMGUI_IMPL_OPENGL_ES2)
#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
// Include glfw3.h after our OpenGL definitions
#include <GLFW/glfw3.h>
#include <GLFW/glfw3.h> // Will drag system OpenGL headers
// [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.

9
examples/example_sdl_opengl3/Makefile
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@ -28,10 +28,9 @@ CXXFLAGS += -g -Wall -Wformat
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
# CXXFLAGS += -DIMGUI_IMPL_OPENGL_ES2
# LINUX_GL_LIBS = -lGLESv2
@ -82,12 +81,6 @@ endif
%.o:$(IMGUI_DIR)/backends/%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:../libs/gl3w/GL/%.c
$(CC) $(CFLAGS) -c -o $@ $<
%.o:../libs/glad/src/%.c
$(CC) $(CFLAGS) -c -o $@ $<
all: $(EXE)
@echo Build complete for $(ECHO_MESSAGE)

10
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
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
# ^^ include paths ^^ source files ^^ output exe ^^ output dir ^^ libraries
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
# 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
```
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
```
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.
@set OUT_DIR=Debug
@set OUT_EXE=example_sdl_opengl3
@set INCLUDES=/I..\.. /I..\..\backends /I%SDL2_DIR%\include /I..\libs\gl3w
@set SOURCES=main.cpp ..\..\backends\imgui_impl_sdl.cpp ..\..\backends\imgui_impl_opengl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c
@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
@set LIBS=/LIBPATH:%SDL2_DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib shell32.lib
mkdir %OUT_DIR%
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
// (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.
// Read online: https://github.com/ocornut/imgui/tree/master/docs
@ -10,7 +9,6 @@
#include <stdio.h>
#include <SDL.h>
#include <SDL_opengl.h>
#if defined(IMGUI_IMPL_OPENGL_ES2)
#include <SDL_opengles2.h>
#endif