104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
/*************************************************************************/
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/* baked_light_baker_cmpxchg.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "typedefs.h"
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#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
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void baked_light_baker_add_64f(double *dst, double value) {
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union {
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int64_t i;
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double f;
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} swapy;
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while (true) {
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swapy.f = *dst;
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int64_t from = swapy.i;
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swapy.f += value;
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int64_t to = swapy.i;
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if (__sync_bool_compare_and_swap((int64_t *)dst, from, to))
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break;
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}
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}
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void baked_light_baker_add_64i(int64_t *dst, int64_t value) {
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while (!__sync_bool_compare_and_swap(dst, *dst, (*dst) + value)) {
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}
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}
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#elif defined(WINDOWS_ENABLED)
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#include "windows.h"
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void baked_light_baker_add_64f(double *dst, double value) {
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union {
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int64_t i;
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double f;
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} swapy;
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while (true) {
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swapy.f = *dst;
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int64_t from = swapy.i;
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swapy.f += value;
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int64_t to = swapy.i;
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int64_t result = InterlockedCompareExchange64((int64_t *)dst, to, from);
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if (result == from)
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break;
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}
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}
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void baked_light_baker_add_64i(int64_t *dst, int64_t value) {
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while (true) {
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int64_t from = *dst;
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int64_t to = from + value;
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int64_t result = InterlockedCompareExchange64(dst, to, from);
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if (result == from)
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break;
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}
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}
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#else
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//in goder (the god of programmers) we trust
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#warning seems this platform or compiler does not support safe cmpxchg, your baked lighting may be funny
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void baked_light_baker_add_64f(double *dst, double value) {
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*dst += value;
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}
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void baked_light_baker_add_64i(int64_t *dst, int64_t value) {
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*dst += value;
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}
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#endif
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