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WIP on configurable OpenGL loader. (#2001, #2002)

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This commit is contained in:
Jérémie Dumas
2018-08-04 10:09:56 -04:00
committed by omar
parent af50ebe7b6
commit e476b7e727
4 changed files with 67 additions and 20 deletions
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20
examples/example_glfw_opengl3/Makefile
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@ -18,17 +18,28 @@ EXE = example_glfw_opengl3
SOURCES = main.cpp
SOURCES += ../imgui_impl_glfw.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 := $(shell uname -s)
# Default OpenGL loader: gl3w
SOURCES += ../libs/gl3w/GL/gl3w.c
CXXFLAGS = -I../libs/gl3w
# You can switch to glad by changing the following compilation options,
# and changing the rule L73 of this Makefile
# SOURCES += ../libs/glad/src/glad.c
# CXXFLAGS = -I../libs/glad/include -DIMGUI_IMPL_OPENGL_LOADER_GLAD
# You can also use glew are you OpenGL loader
# This assumes a system-wide installation
# CXXFLAGS = -lGLEW -DIMGUI_IMPL_OPENGL_LOADER_GLEW
ifeq ($(UNAME_S), Linux) #LINUX
ECHO_MESSAGE = "Linux"
LIBS = -lGL `pkg-config --static --libs glfw3`
CXXFLAGS = -I../ -I../../ -I../libs/gl3w `pkg-config --cflags glfw3`
CXXFLAGS += -I../ -I../../ `pkg-config --cflags glfw3`
CXXFLAGS += -Wall -Wformat
CFLAGS = $(CXXFLAGS)
endif
@ -39,7 +50,7 @@ ifeq ($(UNAME_S), Darwin) #APPLE
#LIBS += -L/usr/local/lib -lglfw3
LIBS += -L/usr/local/lib -lglfw
CXXFLAGS = -I../ -I../../ -I../libs/gl3w -I/usr/local/include
CXXFLAGS += -I../ -I../../ -I/usr/local/include
CXXFLAGS += -Wall -Wformat
CFLAGS = $(CXXFLAGS)
endif
@ -48,7 +59,7 @@ ifeq ($(findstring MINGW,$(UNAME_S)),MINGW)
ECHO_MESSAGE = "Windows"
LIBS = -lglfw3 -lgdi32 -lopengl32 -limm32
CXXFLAGS = -I../ -I../../ -I../libs/gl3w `pkg-config --cflags glfw3`
CXXFLAGS += -I../ -I../../ `pkg-config --cflags glfw3`
CXXFLAGS += -Wall -Wformat
CFLAGS = $(CXXFLAGS)
endif
@ -64,6 +75,7 @@ endif
$(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:../libs/gl3w/GL/%.c
# %.o:../libs/glad/src/%.c
$(CC) $(CFLAGS) -c -o $@ $<
all: $(EXE)

36
examples/example_glfw_opengl3/main.cpp
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@ -8,10 +8,16 @@
#include "imgui_impl_opengl3.h"
#include <stdio.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>
// This example is using gl3w to access OpenGL functions. You may use another OpenGL loader/header such as: glew, glext, glad, glLoadGen, etc.
#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
#include <GL/gl3w.h>
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
#include <GL/glew.h>
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
#include <glad/glad.h>
#else
#pragma error("Cannot use custom loader for example application.")
#endif
#include <GLFW/glfw3.h> // Include glfw3.h after our OpenGL definitions
@ -50,7 +56,19 @@ int main(int, char**)
return 1;
glfwMakeContextCurrent(window);
glfwSwapInterval(1); // Enable vsync
gl3wInit();
#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
GLenum err = gl3wInit();
if (!err) {
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
GLenum err = glewInit();
if (GLEW_OK != err) {
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
GLenum err = gladLoadGL();
if (!err) {
#endif
fprintf(stderr, "Failed to initialize OpenGL\n");
return 1;
}
// Setup Dear ImGui binding
IMGUI_CHECKVERSION();
@ -67,8 +85,8 @@ int main(int, char**)
//ImGui::StyleColorsClassic();
// Load Fonts
// - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
// - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
// - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
// - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
// - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
// - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
// - Read 'misc/fonts/README.txt' for more instructions and details.
@ -115,7 +133,7 @@ int main(int, char**)
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
ImGui::Checkbox("Another Window", &show_another_window);
ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
@ -146,7 +164,7 @@ int main(int, char**)
glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
glClear(GL_COLOR_BUFFER_BIT);
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
glfwMakeContextCurrent(window);
glfwSwapBuffers(window);
}