1 /*************************************************************************/
2 /* baked_light_baker_cmpxchg.cpp */
3 /*************************************************************************/
4 /* This file is part of: */
5 /* GODOT ENGINE */
6 /* https://godotengine.org */
7 /*************************************************************************/
8 /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
9 /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
10 /* */
11 /* Permission is hereby granted, free of charge, to any person obtaining */
12 /* a copy of this software and associated documentation files (the */
13 /* "Software"), to deal in the Software without restriction, including */
14 /* without limitation the rights to use, copy, modify, merge, publish, */
15 /* distribute, sublicense, and/or sell copies of the Software, and to */
16 /* permit persons to whom the Software is furnished to do so, subject to */
17 /* the following conditions: */
18 /* */
19 /* The above copyright notice and this permission notice shall be */
20 /* included in all copies or substantial portions of the Software. */
21 /* */
22 /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
23 /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
24 /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
25 /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
26 /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
27 /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
28 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
29 /*************************************************************************/
30 #include "typedefs.h"
31
32 #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
33
baked_light_baker_add_64f(double * dst,double value)34 void baked_light_baker_add_64f(double *dst, double value) {
35
36 union {
37 int64_t i;
38 double f;
39 } swapy;
40
41 while (true) {
42 swapy.f = *dst;
43 int64_t from = swapy.i;
44 swapy.f += value;
45 int64_t to = swapy.i;
46 if (__sync_bool_compare_and_swap((int64_t *)dst, from, to))
47 break;
48 }
49 }
50
baked_light_baker_add_64i(int64_t * dst,int64_t value)51 void baked_light_baker_add_64i(int64_t *dst, int64_t value) {
52
53 while (!__sync_bool_compare_and_swap(dst, *dst, (*dst) + value)) {
54 }
55 }
56
57 #elif defined(WINDOWS_ENABLED)
58
59 #include "windows.h"
60
baked_light_baker_add_64f(double * dst,double value)61 void baked_light_baker_add_64f(double *dst, double value) {
62
63 union {
64 int64_t i;
65 double f;
66 } swapy;
67
68 while (true) {
69 swapy.f = *dst;
70 int64_t from = swapy.i;
71 swapy.f += value;
72 int64_t to = swapy.i;
73 int64_t result = InterlockedCompareExchange64((int64_t *)dst, to, from);
74 if (result == from)
75 break;
76 }
77 }
78
baked_light_baker_add_64i(int64_t * dst,int64_t value)79 void baked_light_baker_add_64i(int64_t *dst, int64_t value) {
80
81 while (true) {
82 int64_t from = *dst;
83 int64_t to = from + value;
84 int64_t result = InterlockedCompareExchange64(dst, to, from);
85 if (result == from)
86 break;
87 }
88 }
89
90 #else
91
92 //in goder (the god of programmers) we trust
93 #warning seems this platform or compiler does not support safe cmpxchg, your baked lighting may be funny
94
baked_light_baker_add_64f(double * dst,double value)95 void baked_light_baker_add_64f(double *dst, double value) {
96
97 *dst += value;
98 }
99
baked_light_baker_add_64i(int64_t * dst,int64_t value)100 void baked_light_baker_add_64i(int64_t *dst, int64_t value) {
101
102 *dst += value;
103 }
104
105 #endif
106