66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/*
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* Copyright 2014 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UTIL_ATOMIC_H__
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#define __UTIL_ATOMIC_H__
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#ifndef __KERNEL_GPU__
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/* Using atomic ops header from Blender. */
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#include "atomic_ops.h"
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ATOMIC_INLINE void atomic_update_max_z(size_t *maximum_value, size_t value)
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{
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size_t prev_value = *maximum_value;
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while(prev_value < value) {
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if(atomic_cas_z(maximum_value, prev_value, value) != prev_value) {
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break;
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}
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}
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}
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#else /* __KERNEL_GPU__ */
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#ifdef __KERNEL_OPENCL__
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/* Float atomics implementation credits:
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* http://suhorukov.blogspot.in/2011/12/opencl-11-atomic-operations-on-floating.html
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*/
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ccl_device_inline void atomic_add_float(volatile ccl_global float *source,
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const float operand)
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{
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union {
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unsigned int int_value;
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float float_value;
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} new_value;
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union {
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unsigned int int_value;
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float float_value;
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} prev_value;
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do {
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prev_value.float_value = *source;
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new_value.float_value = prev_value.float_value + operand;
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} while(atomic_cmpxchg((volatile ccl_global unsigned int *)source,
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prev_value.int_value,
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new_value.int_value) != prev_value.int_value);
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}
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#endif /* __KERNEL_OPENCL__ */
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#endif /* __KERNEL_GPU__ */
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#endif /* __UTIL_ATOMIC_H__ */
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