AnimTestbed/3rdparty/imnodes/example/main.cpp

#include "node_editor.h"
#include <imgui.h>
#include <imgui_impl_sdl.h>
#include <imgui_impl_opengl3.h>
#include <imnodes.h>
#include <stdio.h>
#include <SDL.h>
#include <GL/gl3w.h>

int main(int, char**)
{
    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0)
    {
        printf("Error: %s\n", SDL_GetError());
        return -1;
    }

#if __APPLE__
    // GL 3.2 Core + GLSL 150
    const char* glsl_version = "#version 150";
    SDL_GL_SetAttribute(
        SDL_GL_CONTEXT_FLAGS,
        SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG); // Always required on Mac
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
#else
    // GL 3.0 + GLSL 130
    const char* glsl_version = "#version 130";
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
#endif

    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
    SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
    SDL_DisplayMode current;
    SDL_GetCurrentDisplayMode(0, &current);
    SDL_Window* window = SDL_CreateWindow(
        "imgui-node-editor example",
        SDL_WINDOWPOS_CENTERED,
        SDL_WINDOWPOS_CENTERED,
        1280,
        720,
        SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
    SDL_GLContext gl_context = SDL_GL_CreateContext(window);
    SDL_GL_MakeCurrent(window, gl_context);
    SDL_GL_SetSwapInterval(1); // Enable vsync

    if (gl3wInit())
    {
        fprintf(stderr, "Failed to initialize OpenGL loader!\n");
        return 1;
    }

    IMGUI_CHECKVERSION();
    ImGui::CreateContext();

    ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
    ImGui_ImplOpenGL3_Init(glsl_version);

    ImNodes::CreateContext();

    // Setup style
    ImGui::StyleColorsDark();
    ImNodes::StyleColorsDark();

    bool done = false;
    bool initialized = false;

    {
        const ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
    }

    while (!done)
    {
        SDL_Event event;
        while (SDL_PollEvent(&event))
        {
            ImGui_ImplSDL2_ProcessEvent(&event);
            if (event.type == SDL_QUIT)
                done = true;
            if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE &&
                event.window.windowID == SDL_GetWindowID(window))
                done = true;
        }

        // Start the Dear ImGui frame
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplSDL2_NewFrame();
        ImGui::NewFrame();

        if (!initialized)
        {
            initialized = true;
            example::NodeEditorInitialize();
        }

        example::NodeEditorShow();

        // Rendering
        ImGui::Render();

        int fb_width, fb_height;
        SDL_GL_GetDrawableSize(window, &fb_width, &fb_height);
        glViewport(0, 0, fb_width, fb_height);
        glClear(GL_COLOR_BUFFER_BIT);

        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
        SDL_GL_SwapWindow(window);
    }

    example::NodeEditorShutdown();
    ImNodes::DestroyContext();

    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplSDL2_Shutdown();
    ImGui::DestroyContext();

    SDL_GL_DeleteContext(gl_context);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}