#include <glad/gl.h>
#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>

#include <cstdio>

int main() {
    glfwSetErrorCallback([](int code, const char* text) {
        std::fprintf(stderr, "GLFW %d: %s\n", code, text);
    });

    if (!glfwInit()) return 1;

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);

    GLFWwindow* window = glfwCreateWindow(640, 480, "RefDock frame", nullptr, nullptr);
    if (!window) {
        glfwTerminate();
        return 1;
    }

    glfwMakeContextCurrent(window);
    if (!gladLoadGL(glfwGetProcAddress) || !GLAD_GL_VERSION_3_3) {
        glfwDestroyWindow(window);
        glfwTerminate();
        return 1;
    }

    glfwSwapInterval(1);

    while (!glfwWindowShouldClose(window)) {
        glfwPollEvents();
        if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) break;

        int width = 0, height = 0;
        glfwGetFramebufferSize(window, &width, &height);
        if (width == 0 || height == 0) {
            glfwWaitEventsTimeout(0.05);
            continue;
        }

        glViewport(0, 0, width, height);
        glClearColor(0.1f, 0.3f, 0.5f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);

        glfwSwapBuffers(window);
    }

    glfwDestroyWindow(window);
    glfwTerminate();
}