Rust で glfw クレートを使う

use glfw::{Action, Context, Key, ffi::glfwTerminate};


fn main() {

    let mut glfw = glfw::init(glfw::FAIL_ON_ERRORS).unwrap();

    ////////////////////////////////////////////////
    ////////////////////////////////////////////////

    let (mut window, events) = glfw.create_window(300, 300, "Hello this is window", glfw::WindowMode::Windowed)
        .expect("Failed to create GLFW window.");
    window.make_current();

    ////////////////////////////////////////////////
    ////////////////////////////////////////////////

    gl::load_with(|s| glfw.get_proc_address_raw(s));
    gl::Viewport::load_with(|s| glfw.get_proc_address_raw(s));

    ////////////////////////////////////////////////
    ////////////////////////////////////////////////

    while window.should_close() == false{

        let (width,height)=window.get_framebuffer_size();

        unsafe{
            gl::Viewport(0,0,width,height);
            gl::ClearColor(0.5,0.5,0.5,1.0);
            gl::Clear(gl::COLOR_BUFFER_BIT);
        }

        window.swap_buffers();

        glfw.wait_events();

    }


}