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 std::io::Cursor;

use glium::index::PrimitiveType;
#[allow(unused_imports)]
use glium::{Display, Frame, Surface};
use glutin::surface::WindowSurface;
use support::{ApplicationContext, State};
use glium::winit::{window::Fullscreen, keyboard::{PhysicalKey, KeyCode}};

mod support;

#[derive(Copy, Clone)]
struct Vertex {
    position: [f32; 2],
    tex_coords: [f32; 2],
}

implement_vertex!(Vertex, position, tex_coords);

struct Application {
    pub vertex_buffer: glium::VertexBuffer<Vertex>,
    pub index_buffer: glium::IndexBuffer<u16>,
    pub opengl_texture: glium::texture::CompressedTexture2d,
    pub program: glium::Program,
    pub fullscreen: bool,
}

impl Application {
    fn toggle_fullscreen(&mut self, window: &glium::winit::window::Window) {
        if self.fullscreen {
            window.set_fullscreen(None);
            self.fullscreen = false;
        } else {
            let monitor_handle = window.available_monitors().next().unwrap();
            let fs = Fullscreen::Borderless(Some(monitor_handle));
            window.set_fullscreen(Some(fs));

            self.fullscreen = true;
        }
    }
}

impl ApplicationContext for Application {
    const WINDOW_TITLE:&'static str = "Glium fullscreen example";

    fn new(display: &Display<WindowSurface>) -> Self {
        // building a texture with "OpenGL" drawn on it
        let image = image::load(Cursor::new(&include_bytes!("../tests/fixture/opengl.png")[..]),
                                image::ImageFormat::Png).unwrap().to_rgba8();
        let image_dimensions = image.dimensions();
        let image = glium::texture::RawImage2d::from_raw_rgba_reversed(&image.into_raw(), image_dimensions);
        let opengl_texture = glium::texture::CompressedTexture2d::new(display, image).unwrap();

        // building the vertex buffer, which contains all the vertices that we will draw
        let vertex_buffer = {
            glium::VertexBuffer::new(display,
                &[
                    Vertex { position: [-1.0, -1.0], tex_coords: [0.0, 0.0] },
                    Vertex { position: [-1.0,  1.0], tex_coords: [0.0, 1.0] },
                    Vertex { position: [ 1.0,  1.0], tex_coords: [1.0, 1.0] },
                    Vertex { position: [ 1.0, -1.0], tex_coords: [1.0, 0.0] }
                ]
            ).unwrap()
        };

        // building the index buffer
        let index_buffer = glium::IndexBuffer::new(display, PrimitiveType::TriangleStrip,
                                                &[1 as u16, 2, 0, 3]).unwrap();

        // compiling shaders and linking them together
        let program = glium::Program::from_source(display, r"
            #version 140

            uniform mat4 matrix;

            in vec2 position;
            in vec2 tex_coords;

            out vec2 v_tex_coords;

            void main() {
                gl_Position = matrix * vec4(position, 0.0, 1.0);
                v_tex_coords = tex_coords;
            }
        ", r"
            #version 140
            uniform sampler2D tex;
            in vec2 v_tex_coords;
            out vec4 color;

            void main() {
                color = texture(tex, v_tex_coords);
            }
        ", None).unwrap();


        let fullscreen = false;

        Self {
            vertex_buffer,
            index_buffer,
            opengl_texture,
            fullscreen,
            program,
        }
    }

    fn draw_frame(&mut self, display: &Display<WindowSurface>) {
        let mut frame = display.draw();
        frame.clear_color(0.0, 1.0, 0.0, 1.0);
        frame.draw(&self.vertex_buffer, &self.index_buffer, &self.program, &uniform! {
                matrix: [
                    [0.5, 0.0, 0.0, 0.0],
                    [0.0, 0.5, 0.0, 0.0],
                    [0.0, 0.0, 0.5, 0.0],
                    [0.0, 0.0, 0.0, 1.0f32]
                ],
                tex: &self.opengl_texture
            }, &Default::default()).unwrap();
        frame.finish().unwrap();
    }

    fn handle_window_event(&mut self, event: &glium::winit::event::WindowEvent, window: &glium::winit::window::Window) {
        match event {
            glium::winit::event::WindowEvent::KeyboardInput { event, .. } => match event.state {
                glium::winit::event::ElementState::Pressed => match event.physical_key {
                    PhysicalKey::Code(KeyCode::Enter) => {
                        self.toggle_fullscreen(window);
                    }
                    _ => (),
                },
                _ => (),
            },
            _ => (),
        }
    }
}

fn main() {
    println!("Press Enter to switch fullscreen mode");
    State::<Application>::run_loop();
}