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
152
153
154
155
156
157
158
159
use crate::__gl;
use crate::__gl::types::{GLenum, GLuint};
use crate::debug::{Object, ObjectType};
use crate::device::Device;
use crate::error::Result;
use crate::Compare;
use std::ops::Range;
#[repr(transparent)]
#[derive(Clone, Copy)]
pub struct Sampler(GLuint);
impl Object for Sampler {
const TYPE: ObjectType = ObjectType::Sampler;
fn handle(&self) -> GLuint {
self.0
}
}
impl Device {
pub unsafe fn create_sampler(&self, desc: SamplerDesc) -> Result<Sampler> {
let mut sampler = 0;
self.0.CreateSamplers(1, &mut sampler);
self.get_error()?;
let min_filter = map_min_filter(desc.min_filter, desc.mip_map);
self.0
.SamplerParameteri(sampler, __gl::TEXTURE_MIN_FILTER, min_filter as _);
let mag_filter = match desc.mag_filter {
Filter::Nearest => __gl::NEAREST,
Filter::Linear => __gl::LINEAR,
};
self.0
.SamplerParameteri(sampler, __gl::TEXTURE_MAG_FILTER, mag_filter as _);
self.0
.SamplerParameteri(sampler, __gl::TEXTURE_WRAP_S, desc.address.0 as _);
self.0
.SamplerParameteri(sampler, __gl::TEXTURE_WRAP_T, desc.address.1 as _);
self.0
.SamplerParameteri(sampler, __gl::TEXTURE_WRAP_R, desc.address.2 as _);
self.0
.SamplerParameterf(sampler, __gl::TEXTURE_LOD_BIAS, desc.lod_bias);
self.0
.SamplerParameterf(sampler, __gl::TEXTURE_MIN_LOD, desc.lod.start);
self.0
.SamplerParameterf(sampler, __gl::TEXTURE_MAX_LOD, desc.lod.end);
let (compare_mode, compare_op): (GLenum, Option<GLenum>) = match desc.compare {
Some(op) => (__gl::COMPARE_REF_TO_TEXTURE, Some(op as _)),
None => (__gl::NONE, None),
};
self.0
.SamplerParameteri(sampler, __gl::TEXTURE_COMPARE_MODE, compare_mode as _);
if let Some(op) = compare_op {
self.0
.SamplerParameteri(sampler, __gl::TEXTURE_COMPARE_FUNC, op as _);
}
self.0.SamplerParameterfv(
sampler,
__gl::TEXTURE_BORDER_COLOR,
desc.border_color.as_ptr(),
);
Ok(Sampler(sampler))
}
pub unsafe fn bind_samplers(&self, first: u32, samplers: &[Sampler]) {
let samplers = samplers.iter().map(|s| s.0).collect::<Vec<_>>();
self.0
.BindSamplers(first, samplers.len() as _, samplers.as_ptr());
}
pub unsafe fn delete_sampler(&self, sampler: Sampler) {
self.delete_samplers(&[sampler])
}
pub unsafe fn delete_samplers(&self, samplers: &[Sampler]) {
self.0.DeleteSamplers(
samplers.len() as _,
samplers.as_ptr() as *const _,
);
}
}
#[derive(Debug, Clone)]
pub struct SamplerDesc {
pub min_filter: Filter,
pub mag_filter: Filter,
pub mip_map: Option<Filter>,
pub address: (SamplerAddress, SamplerAddress, SamplerAddress),
pub lod_bias: f32,
pub lod: Range<f32>,
pub compare: Option<Compare>,
pub border_color: [f32; 4],
}
#[repr(u32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum Filter {
Nearest = __gl::LINEAR,
Linear = __gl::NEAREST,
}
fn map_min_filter(filter: Filter, mip_map: Option<Filter>) -> GLenum {
match (filter, mip_map) {
(Filter::Nearest, None) => __gl::NEAREST,
(Filter::Nearest, Some(Filter::Nearest)) => __gl::NEAREST_MIPMAP_NEAREST,
(Filter::Nearest, Some(Filter::Linear)) => __gl::NEAREST_MIPMAP_LINEAR,
(Filter::Linear, None) => __gl::LINEAR,
(Filter::Linear, Some(Filter::Nearest)) => __gl::LINEAR_MIPMAP_NEAREST,
(Filter::Linear, Some(Filter::Linear)) => __gl::LINEAR_MIPMAP_LINEAR,
}
}
#[repr(u32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum SamplerAddress {
Repeat = __gl::REPEAT,
MirrorRepeat = __gl::MIRRORED_REPEAT,
ClampEdge = __gl::CLAMP_TO_EDGE,
ClampBorder = __gl::CLAMP_TO_BORDER,
MirrorClampEdge = __gl::MIRROR_CLAMP_TO_EDGE,
}