glium 0.6.3

High-level and safe OpenGL wrapper.
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#[macro_use]
extern crate glium;

use glium::Surface;

mod support;

macro_rules! blending_test {
    ($name:ident, $func:expr, $source:expr, $dest:expr, $result:expr) => (
        #[test]
        fn $name() {
            let display = support::build_display();

            let params = glium::DrawParameters {
                blending_function: Some($func),
                .. Default::default()
            };

            let (vb, ib) = support::build_rectangle_vb_ib(&display);

            let program = program!(&display,
                140 => {
                    vertex: "
                        #version 140

                        in vec2 position;

                        void main() {
                            gl_Position = vec4(position, 0.0, 1.0);
                        }
                    ",
                    fragment: "
                        #version 140

                        out vec4 color;
                        void main() {
                            color = vec4(1.0, 0.0, 0.0, 1.0);
                        }
                    "
                },
                110 => {
                    vertex: "
                        #version 110

                        attribute vec2 position;

                        void main() {
                            gl_Position = vec4(position, 0.0, 1.0);
                        }
                    ",
                    fragment: "
                        #version 110

                        void main() {
                            gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
                        }
                    "
                },
                100 => {
                    vertex: "
                        #version 100

                        attribute lowp vec2 position;

                        void main() {
                            gl_Position = vec4(position, 0.0, 1.0);
                        }
                    ",
                    fragment: "
                        #version 100

                        void main() {
                            gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
                        }
                    "
                },
            ).unwrap();

            let texture = support::build_renderable_texture(&display);
            texture.as_surface().clear(None, Some($source), None, None);
            texture.as_surface().draw(&vb, &ib, &program, &uniform!{ color: $dest },
                                      &params).unwrap();

            let data: Vec<Vec<(u8, u8, u8, u8)>> = texture.read();
            for row in data.iter() {
                for pixel in row.iter() {
                    assert_eq!(pixel, &$result);
                }
            }

            display.assert_no_error(None);
        }
    )
}


blending_test!(min_blending, glium::BlendingFunction::Min,
               (0.0, 0.2, 0.3, 0.0), (1.0, 0.0, 0.0, 1.0), (0, 0, 0, 0));

blending_test!(max_blending, glium::BlendingFunction::Max,
               (0.4, 1.0, 1.0, 0.2), (1.0, 0.0, 0.0, 1.0), (255, 255, 255, 255));

blending_test!(one_plus_one, glium::BlendingFunction::Addition {
                   source: glium::LinearBlendingFactor::One,
                   destination: glium::LinearBlendingFactor::One,
               },
               (0.0, 1.0, 1.0, 0.0), (1.0, 0.0, 0.0, 1.0), (255, 255, 255, 255));