glium 0.32.1

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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use glium::glutin::{window::WindowBuilder, ContextBuilder};
use glium::glutin::event_loop::{EventLoop, ControlFlow};
use glium::glutin::event::{Event, WindowEvent, ElementState, MouseButton};
use glium::{Display, Surface};

use std::collections::HashMap;

// This example shows how to dynamically open new windows.

fn main() {
    let event_loop = EventLoop::new();

    let wb = WindowBuilder::new()
        .with_title("Test main");

    let cb = ContextBuilder::new();

    let display = Display::new(wb, cb, &event_loop).unwrap();

    let mut counter = 0;
    let mut extra_windows = HashMap::new();

    event_loop.run(move |ev, event_loop, cf| {
        match ev {
            Event::WindowEvent { event: WindowEvent::CloseRequested, window_id } => {
                if window_id == display.gl_window().window().id() {
                    // Close the application when main window is closed
                    *cf = ControlFlow::Exit;
                } else {
                    // For other windows we only close the specified window
                    extra_windows.remove(&window_id);
                }
            }
            // Clicking on the main window spawns new windows
            Event::WindowEvent { event: WindowEvent::MouseInput {
                state: ElementState::Released,
                button: MouseButton::Left,
                ..
            }, window_id } if window_id == display.gl_window().window().id() => {
                counter += 1;

                let wb = WindowBuilder::new()
                    .with_title(&format!("Test {}", counter));

                let cb = ContextBuilder::new();

                let extra_display = Display::new(wb, cb, &event_loop).unwrap();

                let id = extra_display.gl_window().window().id();
                extra_windows.insert(id, extra_display);
            }
            Event::RedrawRequested(id) => {
                if id == display.gl_window().window().id() {
                    let mut target = display.draw();
                    // We draw the main window in red
                    target.clear_color(1.0, 0.0, 0.0, 1.0);
                    target.finish().unwrap();
                } else if let Some(extra_display) = extra_windows.get(&id) {
                    let mut target = extra_display.draw();
                    // The other windows are drawn in blue
                    target.clear_color(0.0, 0.0, 1.0, 1.0);
                    target.finish().unwrap();
                }
            },
            _ => (),
        }
    });
}