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
|
/*************************************************************************/
/* baked_light_baker_cmpxchg.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "typedefs.h"
#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
void baked_light_baker_add_64f(double *dst,double value) {
union {
int64_t i;
double f;
} swapy;
while(true) {
swapy.f=*dst;
int64_t from = swapy.i;
swapy.f+=value;
int64_t to=swapy.i;
if (__sync_bool_compare_and_swap((int64_t*)dst,from,to))
break;
}
}
void baked_light_baker_add_64i(int64_t *dst,int64_t value) {
while(!__sync_bool_compare_and_swap(dst,*dst,(*dst)+value)) {}
}
#elif defined(WINDOWS_ENABLED)
#include "windows.h"
void baked_light_baker_add_64f(double *dst,double value) {
union {
int64_t i;
double f;
} swapy;
while(true) {
swapy.f=*dst;
int64_t from = swapy.i;
swapy.f+=value;
int64_t to=swapy.i;
int64_t result = InterlockedCompareExchange64((int64_t*)dst,to,from);
if (result==from)
break;
}
}
void baked_light_baker_add_64i(int64_t *dst,int64_t value) {
while(true) {
int64_t from = *dst;
int64_t to = from+value;
int64_t result = InterlockedCompareExchange64(dst,to,from);
if (result==from)
break;
}
}
#else
//in goder (the god of programmers) we trust
#warning seems this platform or compiler does not support safe cmpxchg, your baked lighting may be funny
void baked_light_baker_add_64f(double *dst,double value) {
*dst+=value;
}
void baked_light_baker_add_64i(int64_t *dst,int64_t value) {
*dst+=value;
}
#endif
|