glium 0.14.0

Elegant and safe OpenGL wrapper. Glium is an intermediate layer between OpenGL and your application. You still need to manually handle the graphics pipeline, but without having to use OpenGL's old and error-prone API. Its objectives: - Be safe to use. Many aspects of OpenGL that can trigger a crash if misused are automatically handled by glium. - Provide an API that enforces good pratices such as RAII or stateless function calls. - Be compatible with all OpenGL versions that support shaders, providing unified API when things diverge. - Avoid all OpenGL errors beforehand. - Produce optimized OpenGL function calls, and allow the user to easily use modern OpenGL techniques.
Documentation 
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#![allow(dead_code)]

extern crate genmesh;
extern crate clock_ticks;
extern crate obj;

use std::thread;
use std::time::Duration;
use glium::{self, Display};
use glium::vertex::VertexBufferAny;

pub mod camera;

pub enum Action {
    Stop,
    Continue,
}

pub fn start_loop<F>(mut callback: F) where F: FnMut() -> Action {
    let mut accumulator = 0;
    let mut previous_clock = clock_ticks::precise_time_ns();

    loop {
        match callback() {
            Action::Stop => break,
            Action::Continue => ()
        };

        let now = clock_ticks::precise_time_ns();
        accumulator += now - previous_clock;
        previous_clock = now;

        const FIXED_TIME_STAMP: u64 = 16666667;
        while accumulator >= FIXED_TIME_STAMP {
            accumulator -= FIXED_TIME_STAMP;

            // if you have a game, update the state here
        }

        thread::sleep(Duration::from_millis(((FIXED_TIME_STAMP - accumulator) / 1000000) as u64));
    }
}

/// Returns a vertex buffer that should be rendered as `TrianglesList`.
pub fn load_wavefront(display: &Display, data: &[u8]) -> VertexBufferAny {
    #[derive(Copy, Clone)]
    struct Vertex {
        position: [f32; 3],
        normal: [f32; 3],
        texture: [f32; 2],
    }

    implement_vertex!(Vertex, position, normal, texture);

    let mut data = ::std::io::BufReader::new(data);
    let data = obj::Obj::load(&mut data);

    let mut vertex_data = Vec::new();

    for object in data.object_iter() {
        for shape in object.group_iter().flat_map(|g| g.indices().iter()) {
            match shape {
                &genmesh::Polygon::PolyTri(genmesh::Triangle { x: v1, y: v2, z: v3 }) => {
                    for v in [v1, v2, v3].iter() {
                        let position = data.position()[v.0];
                        let texture = v.1.map(|index| data.texture()[index]);
                        let normal = v.2.map(|index| data.normal()[index]);

                        let texture = texture.unwrap_or([0.0, 0.0]);
                        let normal = normal.unwrap_or([0.0, 0.0, 0.0]);

                        vertex_data.push(Vertex {
                            position: position,
                            normal: normal,
                            texture: texture,
                        })
                    }
                },
                _ => unimplemented!()
            }
        }
    }

    glium::vertex::VertexBuffer::new(display, &vertex_data).unwrap().into_vertex_buffer_any()
}