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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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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.