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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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@ -104,6 +104,7 @@ Other Changes:
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- Examples: OpenGL3: Tweaked the imgui_impl_opengl3.cpp to work as-is with Emscripten + WebGL 2.0. (#1941). [@o-micron]
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- Examples: OpenGL3: Made the example app default to GL 3.0 + GLSL 130 (instead of GL 3.2 + GLSL 150) unless on Mac.
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- Examples: OpenGL3: Added error output when shaders fail to compile/link.
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- Examples: OpenGL3: Added support for glew and glad OpenGL loaders out of the box. (#2001, #2002) [@jdumas]
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- Examples: OpenGL2: Disabling/restoring GL_LIGHTING and GL_COLOR_MATERIAL to increase compatibility with legacy OpenGL applications. (#1996)
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- Examples: DirectX10, DirectX11: Fixed unreleased resources in Init and Shutdown functions. (#1944)
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- Examples: DirectX11: Querying for IDXGIFactory instead of IDXGIFactory1 to increase compatibility. (#1989) [@matt77hias]
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@ -19,21 +19,28 @@ SOURCES = main.cpp
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SOURCES += ../imgui_impl_glfw.cpp ../imgui_impl_opengl3.cpp
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SOURCES += ../../imgui.cpp ../../imgui_demo.cpp ../../imgui_draw.cpp
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OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
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UNAME_S := $(shell uname -s)
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# Default OpenGL loader: gl3w
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##---------------------------------------------------------------------
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## OPENGL LOADER
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##---------------------------------------------------------------------
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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
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# You can switch to glad by changing the following compilation options,
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# and changing the rule L73 of this Makefile
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## Using OpenGL loader: glew
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## (This assumes a system-wide installation)
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# CXXFLAGS = -lGLEW -DIMGUI_IMPL_OPENGL_LOADER_GLEW
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## Using OpenGL loader: glad
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## (You'll also need to change the rule at line ~77 of this Makefile to compile/link glad.c/.o)
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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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# You can also use glew are you OpenGL loader
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# This assumes a system-wide installation
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# CXXFLAGS = -lGLEW -DIMGUI_IMPL_OPENGL_LOADER_GLEW
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##---------------------------------------------------------------------
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## BUILD FLAGS PER PLATFORM
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##---------------------------------------------------------------------
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ifeq ($(UNAME_S), Linux) #LINUX
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ECHO_MESSAGE = "Linux"
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@ -64,6 +71,9 @@ ifeq ($(findstring MINGW,$(UNAME_S)),MINGW)
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CFLAGS = $(CXXFLAGS)
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endif
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##---------------------------------------------------------------------
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## BUILD RULES
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##---------------------------------------------------------------------
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%.o:%.cpp
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$(CXX) $(CXXFLAGS) -c -o $@ $<
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@ -1,22 +1,23 @@
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// ImGui - standalone example application for GLFW + OpenGL 3, using programmable pipeline
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// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
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// (GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
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// (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.)
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#include "imgui.h"
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#include "imgui_impl_glfw.h"
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#include "imgui_impl_opengl3.h"
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#include <stdio.h>
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// This example is using gl3w to access OpenGL functions. You may use another OpenGL loader/header such as: glew, glext, glad, glLoadGen, etc.
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// About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual function pointers to be loaded manually.
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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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#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
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#include <GL/gl3w.h>
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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>
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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>
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#include <glad/glad.h> // Initialize with gladLoadGL()
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#else
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#pragma error("Cannot use custom loader for example application.")
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#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
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#endif
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#include <GLFW/glfw3.h> // Include glfw3.h after our OpenGL definitions
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@ -56,17 +57,18 @@ int main(int, char**)
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return 1;
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glfwMakeContextCurrent(window);
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glfwSwapInterval(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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GLenum err = gl3wInit();
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if (!err) {
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bool err = gl3wInit() != 0;
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
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GLenum err = glewInit();
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if (GLEW_OK != err) {
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bool err = glewInit() != GLEW_OK;
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
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GLenum err = gladLoadGL();
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if (!err) {
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bool err = gladLoadGL() != 0;
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#endif
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fprintf(stderr, "Failed to initialize OpenGL\n");
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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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@ -18,11 +18,29 @@ EXE = example_sdl_opengl3
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SOURCES = main.cpp
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SOURCES += ../imgui_impl_sdl.cpp ../imgui_impl_opengl3.cpp
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SOURCES += ../../imgui.cpp ../../imgui_demo.cpp ../../imgui_draw.cpp
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SOURCES += ../libs/gl3w/GL/gl3w.c
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OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
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UNAME_S := $(shell uname -s)
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##---------------------------------------------------------------------
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## OPENGL LOADER
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##---------------------------------------------------------------------
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## Using OpenGL loader: gl3w [default]
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SOURCES += ../libs/gl3w/GL/gl3w.c
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CXXFLAGS = -I../libs/gl3w
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## Using OpenGL loader: glew
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## (This assumes a system-wide installation)
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# CXXFLAGS = -lGLEW -DIMGUI_IMPL_OPENGL_LOADER_GLEW
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## Using OpenGL loader: glad
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## (You'll also need to change the rule at line ~77 of this Makefile to compile/link glad.c/.o)
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# SOURCES += ../libs/glad/src/glad.c
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# CXXFLAGS = -I../libs/glad/include -DIMGUI_IMPL_OPENGL_LOADER_GLAD
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##---------------------------------------------------------------------
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## BUILD FLAGS PER PLATFORM
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##---------------------------------------------------------------------
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ifeq ($(UNAME_S), Linux) #LINUX
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ECHO_MESSAGE = "Linux"
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@ -51,6 +69,9 @@ ifeq ($(findstring MINGW,$(UNAME_S)),MINGW)
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CFLAGS = $(CXXFLAGS)
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endif
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##---------------------------------------------------------------------
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## BUILD RULES
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##---------------------------------------------------------------------
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%.o:%.cpp
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$(CXX) $(CXXFLAGS) -c -o $@ $<
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@ -9,10 +9,18 @@
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#include <stdio.h>
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#include <SDL.h>
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#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.
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//#include <glew.h>
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//#include <glext.h>
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//#include <glad/glad.h>
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// About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual function pointers to be loaded manually.
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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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#if 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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#else
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#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
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#endif
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int main(int, char**)
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{
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@ -49,7 +57,20 @@ int main(int, char**)
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SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
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SDL_GLContext gl_context = SDL_GL_CreateContext(window);
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SDL_GL_SetSwapInterval(1); // Enable vsync
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gl3wInit();
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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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#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 binding
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IMGUI_CHECKVERSION();
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@ -11,6 +11,7 @@
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2018-08-29: OpenGL: Added support for more OpenGL loaders: glew and glad, with comments indicative that any loader can be used.
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// 2018-08-09: OpenGL: Default to OpenGL ES 3 on iOS and Android. GLSL version default to "#version 300 ES".
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// 2018-07-30: OpenGL: Support for GLSL 300 ES and 410 core. Fixes for Emscripten compilation.
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// 2018-07-10: OpenGL: Support for more GLSL versions (based on the GLSL version string). Added error output when shaders fail to compile/link.
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@ -72,18 +73,16 @@
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// OpenGL ES 3
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#include <GLES3/gl3.h> // Use GL ES 3
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#else
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// OpenGL Regular
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// (About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual functions to be loaded manually.
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// Helper libraries are often used for this purpose! Here we are using gl3w.h, which requires a call to gl3wInit().
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// You may use another any other loader/header of your choice, such as glew, glext, glad, glLoadGen, etc.)
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// Regular OpenGL
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// About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual function pointers to be loaded manually.
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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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#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
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#include <GL/gl3w.h>
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
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#include <GL/glew.h>
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
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#include <glad/glad.h>
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#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEXT)
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#include <glext.h>
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#else
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#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
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#endif
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@ -10,9 +10,9 @@
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// https://github.com/ocornut/imgui
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// About OpenGL function loaders:
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// Modern OpenGL requires individual functions to be loaded manually. Helper libraries are often used for this purpose.
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// Here we are using gl3w.h, which requires a call to gl3wInit().
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// You may use another any other loader/header of your choice, such as glew, glext, glad, glLoadGen, etc.
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// About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual function pointers to be loaded manually.
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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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// About GLSL version:
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// The 'glsl_version' initialization parameter should be NULL (default) or a "#version XXX" string.
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