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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if defined(__SPLIT_KERNEL__) || defined(__KERNEL_CUDA__)
# define __ATOMIC_PASS_WRITE__
#endif
CCL_NAMESPACE_BEGIN
ccl_device_inline void kernel_write_pass_float(ccl_global float *buffer, float value)
{
ccl_global float *buf = buffer;
#ifdef __ATOMIC_PASS_WRITE__
atomic_add_and_fetch_float(buf, value);
#else
*buf += value;
#endif
}
ccl_device_inline void kernel_write_pass_float3(ccl_global float *buffer, float3 value)
{
#ifdef __ATOMIC_PASS_WRITE__
ccl_global float *buf_x = buffer + 0;
ccl_global float *buf_y = buffer + 1;
ccl_global float *buf_z = buffer + 2;
atomic_add_and_fetch_float(buf_x, value.x);
atomic_add_and_fetch_float(buf_y, value.y);
atomic_add_and_fetch_float(buf_z, value.z);
#else
ccl_global float3 *buf = (ccl_global float3 *)buffer;
*buf += value;
#endif
}
ccl_device_inline void kernel_write_pass_float4(ccl_global float *buffer, float4 value)
{
#ifdef __ATOMIC_PASS_WRITE__
ccl_global float *buf_x = buffer + 0;
ccl_global float *buf_y = buffer + 1;
ccl_global float *buf_z = buffer + 2;
ccl_global float *buf_w = buffer + 3;
atomic_add_and_fetch_float(buf_x, value.x);
atomic_add_and_fetch_float(buf_y, value.y);
atomic_add_and_fetch_float(buf_z, value.z);
atomic_add_and_fetch_float(buf_w, value.w);
#else
ccl_global float4 *buf = (ccl_global float4 *)buffer;
*buf += value;
#endif
}
#ifdef __DENOISING_FEATURES__
ccl_device_inline void kernel_write_pass_float_variance(ccl_global float *buffer, float value)
{
kernel_write_pass_float(buffer, value);
/* The online one-pass variance update that's used for the megakernel can't easily be implemented
* with atomics, so for the split kernel the E[x^2] - 1/N * (E[x])^2 fallback is used. */
kernel_write_pass_float(buffer + 1, value * value);
}
# ifdef __ATOMIC_PASS_WRITE__
# define kernel_write_pass_float3_unaligned kernel_write_pass_float3
# else
ccl_device_inline void kernel_write_pass_float3_unaligned(ccl_global float *buffer, float3 value)
{
buffer[0] += value.x;
buffer[1] += value.y;
buffer[2] += value.z;
}
# endif
ccl_device_inline void kernel_write_pass_float3_variance(ccl_global float *buffer, float3 value)
{
kernel_write_pass_float3_unaligned(buffer, value);
kernel_write_pass_float3_unaligned(buffer + 3, value * value);
}
#endif /* __DENOISING_FEATURES__ */
CCL_NAMESPACE_END
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