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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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21
examples/imgui_impl_opengl3.cpp
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@ -9,7 +9,7 @@
// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
// https://github.com/ocornut/imgui
// CHANGELOG
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2018-08-09: OpenGL: Default to OpenGL ES 3 on iOS and Android. GLSL version default to "#version 300 ES".
// 2018-07-30: OpenGL: Support for GLSL 300 ES and 410 core. Fixes for Emscripten compilation.
@ -76,10 +76,17 @@
// (About OpenGL function loaders: modern OpenGL doesn't have a standard header file and requires individual functions to be loaded manually.
// Helper libraries are often used for this purpose! Here we are using gl3w.h, which requires a call to gl3wInit().
// You may use another any other loader/header of your choice, such as glew, glext, glad, glLoadGen, etc.)
#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
#include <GL/gl3w.h>
//#include <glew.h>
//#include <glext.h>
//#include <glad/glad.h>
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
#include <GL/glew.h>
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
#include <glad/glad.h>
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEXT)
#include <glext.h>
#else
#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
#endif
#endif
// OpenGL Data
@ -120,7 +127,7 @@ void ImGui_ImplOpenGL3_NewFrame()
// OpenGL3 Render function.
// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so.
// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so.
void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
{
// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
@ -136,7 +143,9 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
glActiveTexture(GL_TEXTURE0);
GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program);
GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
#ifdef GL_SAMPLER_BINDING
GLint last_sampler; glGetIntegerv(GL_SAMPLER_BINDING, &last_sampler);
#endif
GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array);
#ifdef GL_POLYGON_MODE
@ -186,7 +195,7 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
#ifdef GL_SAMPLER_BINDING
glBindSampler(0, 0); // We use combined texture/sampler state. Applications using GL 3.3 may set that otherwise.
#endif
// Recreate the VAO every time
// Recreate the VAO every time
// (This is to easily allow multiple GL contexts. VAO are not shared among GL contexts, and we don't track creation/deletion of windows so we don't have an obvious key to use to cache them.)
GLuint vao_handle = 0;
glGenVertexArrays(1, &vao_handle);