Box2D
2.3.0
A 2D Physics Engine for Games
Box2D
Common
b2StackAllocator.h
1
/*
2
* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
3
*
4
* This software is provided 'as-is', without any express or implied
5
* warranty. In no event will the authors be held liable for any damages
6
* arising from the use of this software.
7
* Permission is granted to anyone to use this software for any purpose,
8
* including commercial applications, and to alter it and redistribute it
9
* freely, subject to the following restrictions:
10
* 1. The origin of this software must not be misrepresented; you must not
11
* claim that you wrote the original software. If you use this software
12
* in a product, an acknowledgment in the product documentation would be
13
* appreciated but is not required.
14
* 2. Altered source versions must be plainly marked as such, and must not be
15
* misrepresented as being the original software.
16
* 3. This notice may not be removed or altered from any source distribution.
17
*/
18
19
#ifndef B2_STACK_ALLOCATOR_H
20
#define B2_STACK_ALLOCATOR_H
21
22
#include <
Box2D/Common/b2Settings.h
>
23
24
const
int32 b2_stackSize = 100 * 1024;
// 100k
25
const
int32 b2_maxStackEntries = 32;
26
27
struct
b2StackEntry
28
{
29
char
* data;
30
int32 size;
31
bool
usedMalloc;
32
};
33
34
// This is a stack allocator used for fast per step allocations.
35
// You must nest allocate/free pairs. The code will assert
36
// if you try to interleave multiple allocate/free pairs.
37
class
b2StackAllocator
38
{
39
public
:
40
b2StackAllocator
();
41
~
b2StackAllocator
();
42
43
void
* Allocate(int32 size);
44
void
Free(
void
* p);
45
46
int32 GetMaxAllocation()
const
;
47
48
private
:
49
50
char
m_data[b2_stackSize];
51
int32 m_index;
52
53
int32 m_allocation;
54
int32 m_maxAllocation;
55
56
b2StackEntry
m_entries[b2_maxStackEntries];
57
int32 m_entryCount;
58
};
59
60
#endif
b2StackAllocator
Definition:
b2StackAllocator.h:37
b2StackEntry
Definition:
b2StackAllocator.h:27
b2Settings.h
Generated on Sun Jun 8 2014 19:36:09 for Box2D by
1.8.7