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/*
* Copyright 2011-2021 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.
*/
#pragma once
#include "kernel/kernel_types.h"
#include "util/util_atomic.h"
CCL_NAMESPACE_BEGIN
/* Control Flow
*
* Utilities for control flow between kernels. The implementation may differ per device
* or even be handled on the host side. To abstract such differences, experiment with
* different implementations and for debugging, this is abstracted using macros.
*
* There is a main path for regular path tracing camera for path tracing. Shadows for next
* event estimation branch off from this into their own path, that may be computed in
* parallel while the main path continues.
*
* Each kernel on the main path must call one of these functions. These may not be called
* multiple times from the same kernel.
*
* INTEGRATOR_PATH_INIT(next_kernel)
* INTEGRATOR_PATH_NEXT(current_kernel, next_kernel)
* INTEGRATOR_PATH_TERMINATE(current_kernel)
*
* For the shadow path similar functions are used, and again each shadow kernel must call
* one of them, and only once.
*/
#define INTEGRATOR_PATH_IS_TERMINATED (INTEGRATOR_STATE(path, queued_kernel) == 0)
#define INTEGRATOR_SHADOW_PATH_IS_TERMINATED (INTEGRATOR_STATE(shadow_path, queued_kernel) == 0)
#ifdef __KERNEL_GPU__
# define INTEGRATOR_PATH_INIT(next_kernel) \
atomic_fetch_and_add_uint32(&kernel_integrator_state.queue_counter->num_queued[next_kernel], \
1); \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = next_kernel;
# define INTEGRATOR_PATH_NEXT(current_kernel, next_kernel) \
atomic_fetch_and_sub_uint32( \
&kernel_integrator_state.queue_counter->num_queued[current_kernel], 1); \
atomic_fetch_and_add_uint32(&kernel_integrator_state.queue_counter->num_queued[next_kernel], \
1); \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = next_kernel;
# define INTEGRATOR_PATH_TERMINATE(current_kernel) \
atomic_fetch_and_sub_uint32( \
&kernel_integrator_state.queue_counter->num_queued[current_kernel], 1); \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = 0;
# define INTEGRATOR_SHADOW_PATH_INIT(next_kernel) \
atomic_fetch_and_add_uint32(&kernel_integrator_state.queue_counter->num_queued[next_kernel], \
1); \
INTEGRATOR_STATE_WRITE(shadow_path, queued_kernel) = next_kernel;
# define INTEGRATOR_SHADOW_PATH_NEXT(current_kernel, next_kernel) \
atomic_fetch_and_sub_uint32( \
&kernel_integrator_state.queue_counter->num_queued[current_kernel], 1); \
atomic_fetch_and_add_uint32(&kernel_integrator_state.queue_counter->num_queued[next_kernel], \
1); \
INTEGRATOR_STATE_WRITE(shadow_path, queued_kernel) = next_kernel;
# define INTEGRATOR_SHADOW_PATH_TERMINATE(current_kernel) \
atomic_fetch_and_sub_uint32( \
&kernel_integrator_state.queue_counter->num_queued[current_kernel], 1); \
INTEGRATOR_STATE_WRITE(shadow_path, queued_kernel) = 0;
# define INTEGRATOR_PATH_INIT_SORTED(next_kernel, key) \
{ \
const int key_ = key; \
atomic_fetch_and_add_uint32( \
&kernel_integrator_state.queue_counter->num_queued[next_kernel], 1); \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = next_kernel; \
INTEGRATOR_STATE_WRITE(path, shader_sort_key) = key_; \
atomic_fetch_and_add_uint32(&kernel_integrator_state.sort_key_counter[next_kernel][key_], \
1); \
}
# define INTEGRATOR_PATH_NEXT_SORTED(current_kernel, next_kernel, key) \
{ \
const int key_ = key; \
atomic_fetch_and_sub_uint32( \
&kernel_integrator_state.queue_counter->num_queued[current_kernel], 1); \
atomic_fetch_and_add_uint32( \
&kernel_integrator_state.queue_counter->num_queued[next_kernel], 1); \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = next_kernel; \
INTEGRATOR_STATE_WRITE(path, shader_sort_key) = key_; \
atomic_fetch_and_add_uint32(&kernel_integrator_state.sort_key_counter[next_kernel][key_], \
1); \
}
#else
# define INTEGRATOR_PATH_INIT(next_kernel) \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = next_kernel;
# define INTEGRATOR_PATH_INIT_SORTED(next_kernel, key) \
{ \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = next_kernel; \
(void)key; \
}
# define INTEGRATOR_PATH_NEXT(current_kernel, next_kernel) \
{ \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = next_kernel; \
(void)current_kernel; \
}
# define INTEGRATOR_PATH_TERMINATE(current_kernel) \
{ \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = 0; \
(void)current_kernel; \
}
# define INTEGRATOR_PATH_NEXT_SORTED(current_kernel, next_kernel, key) \
{ \
INTEGRATOR_STATE_WRITE(path, queued_kernel) = next_kernel; \
(void)key; \
(void)current_kernel; \
}
# define INTEGRATOR_SHADOW_PATH_INIT(next_kernel) \
INTEGRATOR_STATE_WRITE(shadow_path, queued_kernel) = next_kernel;
# define INTEGRATOR_SHADOW_PATH_NEXT(current_kernel, next_kernel) \
{ \
INTEGRATOR_STATE_WRITE(shadow_path, queued_kernel) = next_kernel; \
(void)current_kernel; \
}
# define INTEGRATOR_SHADOW_PATH_TERMINATE(current_kernel) \
{ \
INTEGRATOR_STATE_WRITE(shadow_path, queued_kernel) = 0; \
(void)current_kernel; \
}
#endif
CCL_NAMESPACE_END
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