gl_helpers 0.1.8

gl helpers
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

use std::mem;

use gl;
use gl::types::*;

use super::{BufferTarget, Usage};

#[derive(Debug, Hash)]
pub struct GLBuffer {
    id: GLuint,

    stride: usize,
    kind: BufferTarget,
    usage: Usage,

    size: usize,
    kind_size: usize,
    length: usize,
}

impl GLBuffer {
    #[inline]
    pub fn new<T>(kind: BufferTarget, stride: usize, usage: Usage, data: &[T]) -> Self {
        let mut id = 0;

        let length = data.len();
        let kind_size = mem::size_of::<T>();
        let size = kind_size * length;
        let gl_kind = kind.into();
        let gl_usage = usage.into();

        unsafe {
            gl::GenBuffers(1, &mut id);
            gl::BindBuffer(gl_kind, id);
            gl::BufferData(
                gl_kind,
                size as GLsizeiptr,
                data.as_ptr() as *const GLvoid,
                gl_usage,
            );
        };

        GLBuffer {
            id: id,

            stride: stride * kind_size,
            kind: kind,
            usage: usage,

            size: size,
            kind_size: kind_size,
            length: length,
        }
    }

    #[inline(always)]
    pub fn id(&self) -> GLuint {
        self.id
    }

    #[inline(always)]
    pub fn stride(&self) -> usize {
        self.stride
    }
    #[inline(always)]
    pub fn kind(&self) -> &BufferTarget {
        &self.kind
    }
    #[inline(always)]
    pub fn usage(&self) -> &Usage {
        &self.usage
    }

    #[inline(always)]
    pub fn size(&self) -> usize {
        self.size
    }
    #[inline(always)]
    pub fn kind_size(&self) -> usize {
        self.kind_size
    }
    #[inline(always)]
    pub fn length(&self) -> usize {
        self.length
    }

    #[inline]
    pub fn bind(&self) -> &Self {
        unsafe {
            gl::BindBuffer(self.kind.into(), self.id);
        }
        self
    }
    #[inline]
    pub fn unbind(&self) -> &Self {
        unsafe {
            gl::BindBuffer(self.kind.into(), 0);
        }
        self
    }

    #[inline]
    pub fn update<T>(&mut self, data: &[T]) -> &mut Self {
        let length = data.len();
        let kind_size = mem::size_of::<T>();
        let size = kind_size * length;
        let gl_kind = self.kind.into();
        let gl_usage = self.usage.into();

        unsafe {
            gl::BindBuffer(gl_kind, self.id);
            gl::BufferData(
                gl_kind,
                size as GLsizeiptr,
                data.as_ptr() as *const GLvoid,
                gl_usage,
            );
        };

        self.size = size;
        self.kind_size = kind_size;
        self.length = length;

        self
    }
}

impl Drop for GLBuffer {
    #[inline]
    fn drop(&mut self) {
        if self.id != 0 {
            unsafe {
                gl::DeleteBuffers(1, &self.id);
            }
        }
    }
}