// Copyright 2015 The Gfx-rs Developers.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
extern crate gfx;
extern crate gfx_window_sdl;
extern crate sdl2;

use gfx::Device;
use sdl2::event::Event;
use sdl2::keyboard::Keycode;
use gfx::format::{Rgba8, DepthStencil};

const CLEAR_COLOR: [f32; 4] = [0.1, 0.2, 0.3, 1.0];

pub fn main() {
    let sdl_context = sdl2::init().unwrap();
    let video = sdl_context.video().unwrap();
    // Request opengl core 3.2 for example:
    video.gl_attr().set_context_profile(sdl2::video::GLProfile::Core);
    video.gl_attr().set_context_version(3, 2);
    let builder = video.window("SDL Window", 1024, 768);
    let (window, _gl_context, mut device, mut factory, main_color, _main_depth) =
        gfx_window_sdl::init::<Rgba8, DepthStencil>(&video, builder).unwrap();

    let mut encoder: gfx::Encoder<_, _> = factory.create_command_buffer().into();

    let mut events = sdl_context.event_pump().unwrap();

    let mut running = true;
    while running {
        // handle events
        for event in events.poll_iter() {
            match event {
                Event::Quit { .. } |
                Event::KeyUp { keycode: Some(Keycode::Escape), .. } => {
                    running = false;
                }
                _ => {}
            }
        }

        // draw a frame
        encoder.clear(&main_color, CLEAR_COLOR);
        // <- draw actual stuff here
        encoder.flush(&mut device);
        window.gl_swap_window();
        device.cleanup();
    }
}