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
|
#pragma once
#include "special_members.h"
#include <cstddef>
#include <glad/gl.h>
#include <utility>
template<typename T> class glMappedBufferWriter {
public:
using difference_type = std::ptrdiff_t;
glMappedBufferWriter(GLenum target, GLuint buffer, size_t count, GLenum usage = GL_STATIC_DRAW) :
target {target}, data {[&]() {
glBindBuffer(target, buffer);
glBufferData(target, static_cast<GLsizeiptr>(sizeof(T) * count), nullptr, usage);
return static_cast<T *>(glMapBuffer(target, GL_WRITE_ONLY));
}()}
{
}
~glMappedBufferWriter()
{
if (target) {
glUnmapBuffer(target);
}
}
glMappedBufferWriter(glMappedBufferWriter && other) noexcept :
target {std::exchange(other.target, 0)}, data {std::exchange(other.data, nullptr)}
{
}
glMappedBufferWriter &
operator=(glMappedBufferWriter && other) noexcept
{
if (target) {
glUnmapBuffer(target);
}
target = std::exchange(other.target, 0);
data = std::exchange(other.data, nullptr);
return *this;
}
NO_COPY(glMappedBufferWriter);
glMappedBufferWriter &
operator++()
{
data++;
return *this;
}
glMappedBufferWriter &
operator++(int)
{
glMappedBufferWriter rtn {data};
data++;
return rtn;
}
T &
operator*()
{
return *data;
}
T *
operator->() const
{
return data;
}
private:
explicit glMappedBufferWriter(T * data) : target {0}, data {data} { }
GLenum target;
T * data;
};
|
