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extern crate gl;
extern crate glfw;

use glfw::{Context, OpenGlProfileHint, WindowHint, WindowMode};

fn main() {
    let glfw = glfw::init(glfw::FAIL_ON_ERRORS).unwrap();

    // Choose a GL profile that is compatible with OS X 10.7+
    glfw.window_hint(WindowHint::ContextVersion(3, 2));
    glfw.window_hint(WindowHint::OpenglForwardCompat(true));
    glfw.window_hint(WindowHint::OpenglProfile(OpenGlProfileHint::Core));

    let (window, _) = glfw.create_window(800, 600, "OpenGL", WindowMode::Windowed)
        .expect("Failed to create GLFW window.");

    // It is essential to make the context current before calling `gl::load_with`.
    window.make_current();

    // Load the OpenGL function pointers
    gl::load_with(|s| window.get_proc_address(s));

    while !window.should_close() {
        // Poll events
        glfw.poll_events();

        // Clear the screen to black
        unsafe {
            gl::ClearColor(0.3, 0.3, 0.3, 1.0);
            gl::Clear(gl::COLOR_BUFFER_BIT);
        }

        // Swap buffers
        window.swap_buffers();
    }
}