glium 0.36.0

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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#[macro_use]
extern crate glium;
use glium::Surface;

fn main() {
    let event_loop = glium::winit::event_loop::EventLoop::builder()
        .build()
        .expect("event loop building");
    let (window, display) = glium::backend::glutin::SimpleWindowBuilder::new()
        .with_title("Glium tutorial #5")
        .build(&event_loop);

    #[derive(Copy, Clone)]
    struct Vertex {
        position: [f32; 2],
        color: [f32; 3],
    }
    implement_vertex!(Vertex, position, color);
    let shape = vec![
        Vertex { position: [-0.5, -0.5], color: [1.0, 0.0, 0.0] },
        Vertex { position: [ 0.0,  0.5], color: [0.0, 1.0, 0.0] },
        Vertex { position: [ 0.5, -0.25], color: [0.0, 0.0, 1.0] }
    ];
    let indices = glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList);
    let vertex_buffer = glium::VertexBuffer::new(&display, &shape).unwrap();

    let vertex_shader_src = r#"
        #version 140

        in vec2 position;
        in vec3 color;      // our new attribute
        out vec3 vertex_color;

        uniform mat4 matrix;

        void main() {
            vertex_color = color; // we need to set the value of each `out` variable.
            gl_Position = matrix * vec4(position, 0.0, 1.0);
        }
    "#;

    let fragment_shader_src = r#"
        #version 140

        in vec3 vertex_color;
        out vec4 color;

        void main() {
            color = vec4(vertex_color, 1.0);   // We need an alpha value as well
        }
    "#;

    let program = glium::Program::from_source(&display, vertex_shader_src, fragment_shader_src, None).unwrap();

    let mut t:f32 = -0.5;

    #[allow(deprecated)]
    event_loop.run(move |ev, window_target| {
        match ev {
            glium::winit::event::Event::WindowEvent { event, .. } => match event {
                glium::winit::event::WindowEvent::CloseRequested => {
                    window_target.exit();
                },
                // We now need to render everyting in response to a RedrawRequested event due to the animation
                glium::winit::event::WindowEvent::RedrawRequested => {
                    // we update `t`
                    t += 0.02;
                    let x = t.sin() * 0.5;

                    let mut target = display.draw();
                    target.clear_color(0.0, 0.0, 1.0, 1.0);

                    let uniforms = uniform! {
                        matrix: [
                            [1.0, 0.0, 0.0, 0.0],
                            [0.0, 1.0, 0.0, 0.0],
                            [0.0, 0.0, 1.0, 0.0],
                            [  x, 0.0, 0.0, 1.0f32],
                        ]
                    };

                    target.draw(&vertex_buffer, &indices, &program, &uniforms,
                                &Default::default()).unwrap();
                    target.finish().unwrap();
                },
                // Because glium doesn't know about windows we need to resize the display
                // when the window's size has changed.
                glium::winit::event::WindowEvent::Resized(window_size) => {
                    display.resize(window_size.into());
                },
                _ => (),
            },
            // By requesting a redraw in response to a AboutToWait event we get continuous rendering.
            // For applications that only change due to user input you could remove this handler.
            glium::winit::event::Event::AboutToWait => {
                window.request_redraw();
            },
            _ => (),
        }
    })
    .unwrap();
}