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imgui/examples/sdl_opengl_example/main.cpp

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// ImGui - standalone example application for SDL2 + OpenGL
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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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#include <imgui.h>
#include "imgui_impl_sdl.h"
#include <stdio.h>
#include <SDL.h>
#include <SDL_opengl.h>
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int main(int, char**)
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{
// Setup SDL
if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
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{
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printf("Error: %s\n", SDL_GetError());
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return -1;
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}
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// Setup window
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SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_DisplayMode current;
SDL_GetCurrentDisplayMode(0, &current);
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SDL_Window *window = SDL_CreateWindow("ImGui SDL2+OpenGL example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
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SDL_GLContext glcontext = SDL_GL_CreateContext(window);
// Setup ImGui binding
ImGui_ImplSdl_Init(window);
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// Load Fonts
// (there is a default font, this is only if you want to change it. see extra_fonts/README.txt for more details)
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//ImGuiIO& io = ImGui::GetIO();
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//io.Fonts->AddFontDefault();
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//io.Fonts->AddFontFromFileTTF("../../extra_fonts/Cousine-Regular.ttf", 15.0f);
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//io.Fonts->AddFontFromFileTTF("../../extra_fonts/DroidSans.ttf", 16.0f);
//io.Fonts->AddFontFromFileTTF("../../extra_fonts/ProggyClean.ttf", 13.0f);
//io.Fonts->AddFontFromFileTTF("../../extra_fonts/ProggyTiny.ttf", 10.0f);
//io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
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bool show_test_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImColor(114, 144, 154);
// Main loop
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bool done = false;
while (!done)
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{
SDL_Event event;
while (SDL_PollEvent(&event))
{
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ImGui_ImplSdl_ProcessEvent(&event);
if (event.type == SDL_QUIT)
done = true;
}
ImGui_ImplSdl_NewFrame(window);
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// 1. Show a simple window
// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
{
static float f = 0.0f;
ImGui::Text("Hello, world!");
ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
ImGui::ColorEdit3("clear color", (float*)&clear_color);
if (ImGui::Button("Test Window")) show_test_window ^= 1;
if (ImGui::Button("Another Window")) show_another_window ^= 1;
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
}
// 2. Show another simple window, this time using an explicit Begin/End pair
if (show_another_window)
{
ImGui::SetNextWindowSize(ImVec2(200,100), ImGuiSetCond_FirstUseEver);
ImGui::Begin("Another Window", &show_another_window);
ImGui::Text("Hello");
ImGui::End();
}
// 3. Show the ImGui test window. Most of the sample code is in ImGui::ShowTestWindow()
if (show_test_window)
{
ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiSetCond_FirstUseEver);
ImGui::ShowTestWindow(&show_test_window);
}
// Rendering
glViewport(0, 0, (int)ImGui::GetIO().DisplaySize.x, (int)ImGui::GetIO().DisplaySize.y);
glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
glClear(GL_COLOR_BUFFER_BIT);
ImGui::Render();
SDL_GL_SwapWindow(window);
}
// Cleanup
ImGui_ImplSdl_Shutdown();
SDL_GL_DeleteContext(glcontext);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}