Initial commit

Author: Nelarius

.clang-format

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+...

README.md

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+# imgui-node-editor

example/main.cpp

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+#include "imgui.h"
+#include "imgui_impl_sdl.h"
+#include "imgui_impl_opengl3.h"
+#include <stdio.h>
+#include <SDL.h>
+#include <GL/gl3w.h>
+
+class SimpleNodeEditor
+{
+public:
+    void show()
+    {
+        ImGui::Begin("hello, world");
+        ImGui::End();
+    }
+
+private:
+};
+
+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_GLContext gl_context = SDL_GL_CreateContext(window);
+    SDL_GL_SetSwapInterval(1); // Enable vsync
+
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO();
+    (void)io;
+
+    ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
+    ImGui_ImplOpenGL3_Init(glsl_version);
+
+    // Setup style
+    ImGui::StyleColorsDark();
+
+    // Simple node editor
+    SimpleNodeEditor node_example;
+
+    bool done = false;
+    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(window);
+        ImGui::NewFrame();
+
+        node_example.show();
+
+        // Rendering
+        ImGui::Render();
+        SDL_GL_MakeCurrent(window, gl_context);
+        glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
+        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+        glClear(GL_COLOR_BUFFER_BIT);
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+        SDL_GL_SwapWindow(window);
+    }
+
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplSDL2_Shutdown();
+    ImGui::DestroyContext();
+
+    SDL_GL_DeleteContext(gl_context);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+}