/
big_buffer.cpp
58 lines (44 loc) · 1.22 KB
/
big_buffer.cpp
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
#include "pch.h"
#include "big_buffer.h"
static BigBufferUser s_currentUser;
// uint32_t for 4-byte aligment
static uint32_t s_bigBuffer[BIG_BUFFER_SIZE / sizeof(uint32_t)];
static void releaseBuffer(void* bufferPtr, BigBufferUser user) {
if (bufferPtr != &s_bigBuffer || user != s_currentUser) {
// todo: panic!
}
s_currentUser = BigBufferUser::None;
}
BigBufferHandle::BigBufferHandle(void* buffer, BigBufferUser user)
: m_bufferPtr(buffer)
, m_user(user)
{
}
BigBufferHandle::BigBufferHandle(BigBufferHandle&& other) {
// swap contents of the two objects
m_bufferPtr = other.m_bufferPtr;
other.m_bufferPtr = nullptr;
m_user = other.m_user;
other.m_user = BigBufferUser::None;
}
BigBufferHandle& BigBufferHandle::operator= (BigBufferHandle&& other) {
// swap contents of the two objects
m_bufferPtr = other.m_bufferPtr;
other.m_bufferPtr = nullptr;
m_user = other.m_user;
other.m_user = BigBufferUser::None;
return *this;
}
BigBufferHandle::~BigBufferHandle() {
if (m_bufferPtr) {
releaseBuffer(m_bufferPtr, m_user);
}
}
BigBufferHandle getBigBuffer(BigBufferUser user) {
if (s_currentUser != BigBufferUser::None) {
// fatal
return {};
}
s_currentUser = user;
return BigBufferHandle(s_bigBuffer, user);
}