use gl::types::*;

use sdl2::event::Event;
use sdl2::keyboard::Keycode;

use std::time::Duration;

fn main () {
	let sdl_context = sdl2::init ().unwrap ();
	let video_subsystem = sdl_context.video ().unwrap ();
	
	let window = video_subsystem.window ("OpenGL? In my Rust?", 1280, 720)
		.position_centered ()
		.opengl ()
		.build ()
	.unwrap ();
	
	println! ("{:?}", &video_subsystem);
	println! ("{}", video_subsystem.current_video_driver ());
	
	gl::load_with (|s| {
		let result = video_subsystem.gl_get_proc_address (s) as *const _;
		//println! ("{:?}", result);
		
		result
	});
	
	assert! (gl::ClearColor::is_loaded ());
	
	let gl_ctx = window.gl_create_context ().unwrap ();
	
	let mut event_pump = sdl_context.event_pump ().unwrap ();
	'running: loop {
		let mouse = event_pump.mouse_state ();
		
		for event in event_pump.poll_iter() {
			match event {
				Event::Quit {..} |
				Event::KeyDown { keycode: Some (Keycode::Escape), .. } => {
					break 'running
				},
				_ => (),
			}
		}
		
		window.gl_make_current (&gl_ctx).unwrap ();
		
		unsafe {
			gl::ClearColor (1.0f32, 0.0f32, 1.0f32, 1.0f32);
			gl::Clear (gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT);
		}
		
		window.gl_swap_window ();
		
		::std::thread::sleep (Duration::from_millis (15));
	}
}