glium 0.14.0

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 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151

#[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)), false, 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);
}