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
|
//! Utilities for buffer operations.
pub mod dynamic;
pub mod r#static;
use std::marker::PhantomData;
use std::ops::RangeBounds;
#[derive(Debug)]
pub struct Buffer<T> {
label: &'static str,
size: u64,
usage: wgpu::BufferUsages,
raw: wgpu::Buffer,
type_: PhantomData<T>,
}
impl<T: bytemuck::Pod> Buffer<T> {
pub fn new(
device: &wgpu::Device,
label: &'static str,
amount: usize,
usage: wgpu::BufferUsages,
) -> Self {
let size = next_copy_size::<T>(amount);
let raw = device.create_buffer(&wgpu::BufferDescriptor {
label: Some(label),
size,
usage,
mapped_at_creation: false,
});
Self {
label,
size,
usage,
raw,
type_: PhantomData,
}
}
pub fn resize(&mut self, device: &wgpu::Device, new_count: usize) -> bool {
let new_size = (std::mem::size_of::<T>() * new_count) as u64;
if self.size < new_size {
self.raw = device.create_buffer(&wgpu::BufferDescriptor {
label: Some(self.label),
size: new_size,
usage: self.usage,
mapped_at_creation: false,
});
self.size = new_size;
true
} else {
false
}
}
pub fn write(
&self,
queue: &wgpu::Queue,
offset_count: usize,
contents: &[T],
) {
queue.write_buffer(
&self.raw,
(std::mem::size_of::<T>() * offset_count) as u64,
bytemuck::cast_slice(contents),
);
}
pub fn slice(
&self,
bounds: impl RangeBounds<wgpu::BufferAddress>,
) -> wgpu::BufferSlice<'_> {
self.raw.slice(bounds)
}
}
fn next_copy_size<T>(amount: usize) -> u64 {
let align_mask = wgpu::COPY_BUFFER_ALIGNMENT - 1;
(((std::mem::size_of::<T>() * amount).next_power_of_two() as u64
+ align_mask)
& !align_mask)
.max(wgpu::COPY_BUFFER_ALIGNMENT)
}
|
