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Examples: OpenGL: Added support for glew and glad OpenGL loaders out of the box. (#2001, #2002). Changelog, tweaks, applied changes to SDL+OpenGL3 example.

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This commit is contained in:
omar
2018-08-28 15:56:03 +02:00
parent e476b7e727
commit b127027cbd
7 changed files with 95 additions and 41 deletions
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25
examples/example_sdl_opengl3/Makefile
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@ -18,11 +18,29 @@ EXE = example_sdl_opengl3
SOURCES = main.cpp
SOURCES += ../imgui_impl_sdl.cpp ../imgui_impl_opengl3.cpp
SOURCES += ../../imgui.cpp ../../imgui_demo.cpp ../../imgui_draw.cpp
SOURCES += ../libs/gl3w/GL/gl3w.c
OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
UNAME_S := $(shell uname -s)
##---------------------------------------------------------------------
## OPENGL LOADER
##---------------------------------------------------------------------
## Using OpenGL loader: gl3w [default]
SOURCES += ../libs/gl3w/GL/gl3w.c
CXXFLAGS = -I../libs/gl3w
## Using OpenGL loader: glew
## (This assumes a system-wide installation)
# CXXFLAGS = -lGLEW -DIMGUI_IMPL_OPENGL_LOADER_GLEW
## Using OpenGL loader: glad
## (You'll also need to change the rule at line ~77 of this Makefile to compile/link glad.c/.o)
# SOURCES += ../libs/glad/src/glad.c
# CXXFLAGS = -I../libs/glad/include -DIMGUI_IMPL_OPENGL_LOADER_GLAD
##---------------------------------------------------------------------
## BUILD FLAGS PER PLATFORM
##---------------------------------------------------------------------
ifeq ($(UNAME_S), Linux) #LINUX
ECHO_MESSAGE = "Linux"
@ -51,6 +69,9 @@ ifeq ($(findstring MINGW,$(UNAME_S)),MINGW)
CFLAGS = $(CXXFLAGS)
endif
##---------------------------------------------------------------------
## BUILD RULES
##---------------------------------------------------------------------
%.o:%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<

31
examples/example_sdl_opengl3/main.cpp
View File

@ -9,10 +9,18 @@
#include <stdio.h>
#include <SDL.h>
#include <GL/gl3w.h> // This example is using gl3w to access OpenGL functions. You may use another OpenGL loader/header such as: glew, glext, glad, glLoadGen, etc.
//#include <glew.h>
//#include <glext.h>
//#include <glad/glad.h>
// About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual function pointers to be loaded manually.
// 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.
#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
#include <GL/gl3w.h> // Initialize with gl3wInit()
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
#include <GL/glew.h> // Initialize with glewInit()
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
#include <glad/glad.h> // Initialize with gladLoadGL()
#else
#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
#endif
int main(int, char**)
{
@ -49,7 +57,20 @@ int main(int, char**)
SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
SDL_GLContext gl_context = SDL_GL_CreateContext(window);
SDL_GL_SetSwapInterval(1); // Enable vsync
gl3wInit();
// Initialize OpenGL loader
#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
bool err = gl3wInit() != 0;
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
bool err = glewInit() != GLEW_OK;
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
bool err = gladLoadGL() != 0;
#endif
if (err)
{
fprintf(stderr, "Failed to initialize OpenGL loader!\n");
return 1;
}
// Setup Dear ImGui binding
IMGUI_CHECKVERSION();