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glium 0.8.1

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. 
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#[macro_use]
extern crate glium;

use glium::Surface;

mod support;

#[test]
fn get_opengl_version() {
    let display = support::build_display();
    let version = display.get_opengl_version();
    display.assert_no_error(None);

    assert!(version.1 >= 1);
}

#[test]
fn clear_color() {
    let display = support::build_display();

    let texture = support::build_renderable_texture(&display);
    texture.as_surface().clear_color(1.0, 0.0, 0.0, 1.0);

    let data: Vec<Vec<(u8, u8, u8, u8)>> = texture.read();

    for row in data.iter() {
        for pixel in row.iter() {
            assert_eq!(pixel, &(255, 0, 0, 255));
        }
    }

    display.assert_no_error(None);
}

#[test]
fn clear_color_rect() {
    let display = support::build_display();

    let texture = support::build_renderable_texture(&display);
    texture.as_surface().clear_color(1.0, 0.0, 0.0, 1.0);

    let rect = glium::Rect { left: 512, bottom: 0, width: 512, height: 1024 };
    texture.as_surface().clear(Some(&rect), Some((0.0, 1.0, 0.0, 1.0)), None, None);

    let data: Vec<Vec<(u8, u8, u8, u8)>> = texture.read();

    for row in data.iter() {
        for (col, pixel) in row.iter().enumerate() {
            if col >= 512 {
                assert_eq!(pixel, &(0, 255, 0, 255));
            } else {
                assert_eq!(pixel, &(255, 0, 0, 255));
            }
        }
    }

    display.assert_no_error(None);
}

#[test]
fn release_shader_compiler() {
    let display = support::build_display();
    display.release_shader_compiler();
    display.assert_no_error(None);
}

#[test]
fn timestamp_query() {
    let display = support::build_display();

    let query1 = glium::debug::TimestampQuery::new(&display);
    let query1 = query1.map(|q| q.get());

    let query2 = glium::debug::TimestampQuery::new(&display);
    let query2 = query2.map(|q| q.get());

    match (query1, query2) {
        (Some(q1), Some(q2)) => assert!(q2 >= q1 && q1 != 0),
        _ => ()
    };

    display.assert_no_error(None);
}

#[test]
fn sync() {
    let display = support::build_display();

    let fence = glium::SyncFence::new(&display);
    if let Ok(fence) = fence {
        fence.wait();
    }

    display.assert_no_error(None);
}

#[test]
fn multiple_displays() {
    let display1 = support::build_display();
    let display2 = support::build_display();

    let (vb1, ib1, program1) = support::build_fullscreen_red_pipeline(&display1);
    let (vb2, ib2, program2) = support::build_fullscreen_red_pipeline(&display2);

    let texture1 = support::build_renderable_texture(&display1);
    let texture2 = support::build_renderable_texture(&display2);

    texture1.as_surface().clear_color(0.0, 0.0, 0.0, 0.0);
    texture2.as_surface().clear_color(0.0, 0.0, 0.0, 0.0);

    texture1.as_surface().draw(&vb1, &ib1, &program1, &glium::uniforms::EmptyUniforms,
                               &Default::default()).unwrap();

    texture2.as_surface().draw(&vb2, &ib2, &program2, &glium::uniforms::EmptyUniforms,
                               &Default::default()).unwrap();
    texture2.as_surface().clear_color(0.0, 1.0, 0.0, 0.0);

    let read_back: Vec<Vec<(u8, u8, u8, u8)>> = texture1.read();
    for row in read_back.iter() {
        for pixel in row.iter() {
            assert_eq!(pixel, &(255, 0, 0, 255));
        }
    }

    let read_back: Vec<Vec<(u8, u8, u8, u8)>> = texture2.read();
    for row in read_back.iter() {
        for pixel in row.iter() {
            assert_eq!(pixel, &(0, 255, 0, 0));
        }
    }

    display1.assert_no_error(None);
    display2.assert_no_error(None);
}

#[test]
fn debug_string() {
    // tests that `insert_debug_marker` doesn't trigger an OpenGL error
    let display = support::build_display();
    display.insert_debug_marker("Hello world").ok();
    display.assert_no_error(None);
}


#[test]
fn is_context_lost() {
    // tests that `is_context_lost` doesn't trigger an OpenGL error
    let display = support::build_display();
    display.is_context_lost();
    display.assert_no_error(None);
}