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
160
161
162
163
164
165
166
167
168
169
170
171
#![deny(missing_docs, missing_copy_implementations)]
use std::error::Error as StdError;
use std::fmt;
use std::ops::{Deref, DerefMut};
use std::sync::MutexGuard;
use Resources;
use {memory, buffer, handle};
#[doc(hidden)]
pub trait Gate<R: Resources> {
unsafe fn set<T>(&self, index: usize, val: T);
unsafe fn slice<'a, 'b, T>(&'a self, len: usize) -> &'b [T];
unsafe fn mut_slice<'a, 'b, T>(&'a self, len: usize) -> &'b mut [T];
}
#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq)]
pub enum Error {
InvalidAccess(memory::Access, memory::Usage),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::InvalidAccess(ref access, ref usage) => {
write!(f, "{}: access = {:?}, usage = {:?}", self.description(), access, usage)
}
}
}
}
impl StdError for Error {
fn description(&self) -> &str {
"The requested mapping access did not match the expected usage"
}
}
fn valid_access(access: memory::Access, usage: memory::Usage) -> Result<(), Error> {
use memory::Usage::*;
match usage {
Upload if access == memory::WRITE => Ok(()),
Download if access == memory::READ => Ok(()),
_ => Err(Error::InvalidAccess(access, usage)),
}
}
#[doc(hidden)]
pub unsafe fn read<R, T, S>(buffer: &buffer::Raw<R>, sync: S)
-> Result<Reader<R, T>, Error>
where R: Resources, T: Copy, S: FnOnce(&mut R::Mapping)
{
try!(valid_access(memory::READ, buffer.get_info().usage));
let mut mapping = buffer.lock_mapping().unwrap();
sync(&mut mapping);
Ok(Reader {
slice: mapping.slice(buffer.len::<T>()),
mapping: mapping,
})
}
#[doc(hidden)]
pub unsafe fn write<R, T, S>(buffer: &buffer::Raw<R>, sync: S)
-> Result<Writer<R, T>, Error>
where R: Resources, T: Copy, S: FnOnce(&mut R::Mapping)
{
try!(valid_access(memory::WRITE, buffer.get_info().usage));
let mut mapping = buffer.lock_mapping().unwrap();
sync(&mut mapping);
Ok(Writer {
slice: mapping.mut_slice(buffer.len::<T>()),
mapping: mapping,
})
}
pub struct Reader<'a, R: Resources, T: 'a + Copy> {
slice: &'a [T],
#[allow(dead_code)] mapping: MutexGuard<'a, R::Mapping>,
}
impl<'a, R: Resources, T: 'a + Copy> Deref for Reader<'a, R, T> {
type Target = [T];
fn deref(&self) -> &[T] { self.slice }
}
pub struct Writer<'a, R: Resources, T: 'a + Copy> {
slice: &'a mut [T],
#[allow(dead_code)] mapping: MutexGuard<'a, R::Mapping>,
}
impl<'a, R: Resources, T: 'a + Copy> Deref for Writer<'a, R, T> {
type Target = [T];
fn deref(&self) -> &[T] { &*self.slice }
}
impl<'a, R: Resources, T: 'a + Copy> DerefMut for Writer<'a, R, T> {
fn deref_mut(&mut self) -> &mut [T] { self.slice }
}
#[derive(Debug, PartialEq, Eq, Hash)]
#[doc(hidden)]
pub struct Status<R: Resources> {
cpu_wrote: bool,
gpu_access: Option<handle::Fence<R>>,
}
#[doc(hidden)]
impl<R: Resources> Status<R> {
pub fn clean() -> Self {
Status {
cpu_wrote: false,
gpu_access: None,
}
}
pub fn cpu_access<F>(&mut self, wait_fence: F)
where F: FnOnce(handle::Fence<R>)
{
self.gpu_access.take().map(wait_fence);
}
pub fn cpu_write_access<F>(&mut self, wait_fence: F)
where F: FnOnce(handle::Fence<R>)
{
self.cpu_access(wait_fence);
self.cpu_wrote = true;
}
pub fn gpu_access(&mut self, fence: handle::Fence<R>) {
self.gpu_access = Some(fence);
}
pub fn ensure_flushed<F>(&mut self, flush: F)
where F: FnOnce()
{
if self.cpu_wrote {
flush();
self.cpu_wrote = false;
}
}
}