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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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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);
}