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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
/* Integrator State
*
* This file defines the data structures that define the state of a path. Any state that is
* preserved and passed between kernel executions is part of this.
*
* The size of this state must be kept as small as possible, to reduce cache misses and keep memory
* usage under control on GPUs that may execute millions of kernels.
*
* Memory may be allocated and passed along in different ways depending on the device. There may
* be a scalar layout, or AoS or SoA layout for batches. The state may be passed along as a pointer
* to every kernel, or the pointer may exist at program scope or in constant memory. To abstract
* these differences between devices and experiment with different layouts, macros are used.
*
* Use IntegratorState to pass a reference to the integrator state for the current path. These are
* defined differently on the CPU and GPU. Use ConstIntegratorState instead of const
* IntegratorState for passing state as read-only, to avoid oddities in typedef behavior.
*
* INTEGRATOR_STATE(state, x, y): read nested struct member x.y of IntegratorState
* INTEGRATOR_STATE_WRITE(state, x, y): write to nested struct member x.y of IntegratorState
*
* INTEGRATOR_STATE_ARRAY(state, x, index, y): read x[index].y
* INTEGRATOR_STATE_ARRAY_WRITE(state, x, index, y): write x[index].y
*
* INTEGRATOR_STATE_NULL: use to pass empty state to other functions.
*/
#include "kernel/types.h"
#include "util/types.h"
#pragma once
CCL_NAMESPACE_BEGIN
/* Data structures */
/* Integrator State
*
* CPU rendering path state with AoS layout. */
typedef struct IntegratorShadowStateCPU {
#define KERNEL_STRUCT_BEGIN(name) struct {
#define KERNEL_STRUCT_MEMBER(parent_struct, type, name, feature) type name;
#define KERNEL_STRUCT_ARRAY_MEMBER KERNEL_STRUCT_MEMBER
#define KERNEL_STRUCT_END(name) \
} \
name;
#define KERNEL_STRUCT_END_ARRAY(name, cpu_size, gpu_size) \
} \
name[cpu_size];
#define KERNEL_STRUCT_VOLUME_STACK_SIZE MAX_VOLUME_STACK_SIZE
#include "kernel/integrator/shadow_state_template.h"
#undef KERNEL_STRUCT_BEGIN
#undef KERNEL_STRUCT_MEMBER
#undef KERNEL_STRUCT_ARRAY_MEMBER
#undef KERNEL_STRUCT_END
#undef KERNEL_STRUCT_END_ARRAY
} IntegratorShadowStateCPU;
typedef struct IntegratorStateCPU {
#define KERNEL_STRUCT_BEGIN(name) struct {
#define KERNEL_STRUCT_MEMBER(parent_struct, type, name, feature) type name;
#define KERNEL_STRUCT_ARRAY_MEMBER KERNEL_STRUCT_MEMBER
#define KERNEL_STRUCT_END(name) \
} \
name;
#define KERNEL_STRUCT_END_ARRAY(name, cpu_size, gpu_size) \
} \
name[cpu_size];
#define KERNEL_STRUCT_VOLUME_STACK_SIZE MAX_VOLUME_STACK_SIZE
#include "kernel/integrator/state_template.h"
#undef KERNEL_STRUCT_BEGIN
#undef KERNEL_STRUCT_MEMBER
#undef KERNEL_STRUCT_ARRAY_MEMBER
#undef KERNEL_STRUCT_END
#undef KERNEL_STRUCT_END_ARRAY
#undef KERNEL_STRUCT_VOLUME_STACK_SIZE
IntegratorShadowStateCPU shadow;
IntegratorShadowStateCPU ao;
} IntegratorStateCPU;
/* Path Queue
*
* Keep track of which kernels are queued to be executed next in the path
* for GPU rendering. */
typedef struct IntegratorQueueCounter {
int num_queued[DEVICE_KERNEL_INTEGRATOR_NUM];
} IntegratorQueueCounter;
/* Integrator State GPU
*
* GPU rendering path state with SoA layout. */
typedef struct IntegratorStateGPU {
#define KERNEL_STRUCT_BEGIN(name) struct {
#define KERNEL_STRUCT_MEMBER(parent_struct, type, name, feature) ccl_global type *name;
#define KERNEL_STRUCT_ARRAY_MEMBER KERNEL_STRUCT_MEMBER
#define KERNEL_STRUCT_END(name) \
} \
name;
#define KERNEL_STRUCT_END_ARRAY(name, cpu_size, gpu_size) \
} \
name[gpu_size];
#define KERNEL_STRUCT_VOLUME_STACK_SIZE MAX_VOLUME_STACK_SIZE
#include "kernel/integrator/state_template.h"
#include "kernel/integrator/shadow_state_template.h"
#undef KERNEL_STRUCT_BEGIN
#undef KERNEL_STRUCT_MEMBER
#undef KERNEL_STRUCT_ARRAY_MEMBER
#undef KERNEL_STRUCT_END
#undef KERNEL_STRUCT_END_ARRAY
#undef KERNEL_STRUCT_VOLUME_STACK_SIZE
/* Count number of queued kernels. */
ccl_global IntegratorQueueCounter *queue_counter;
/* Count number of kernels queued for specific shaders. */
ccl_global int *sort_key_counter[DEVICE_KERNEL_INTEGRATOR_NUM];
/* Index of shadow path which will be used by a next shadow path. */
ccl_global int *next_shadow_path_index;
/* Index of main path which will be used by a next shadow catcher split. */
ccl_global int *next_main_path_index;
/* Divisor used to partition active indices by locality when sorting by material. */
uint sort_partition_divisor;
} IntegratorStateGPU;
/* Abstraction
*
* Macros to access data structures on different devices.
*
* Note that there is a special access function for the shadow catcher state. This access is to
* happen from a kernel which operates on a "main" path. Attempt to use shadow catcher accessors
* from a kernel which operates on a shadow catcher state will cause bad memory access. */
#ifndef __KERNEL_GPU__
/* Scalar access on CPU. */
typedef IntegratorStateCPU *ccl_restrict IntegratorState;
typedef const IntegratorStateCPU *ccl_restrict ConstIntegratorState;
typedef IntegratorShadowStateCPU *ccl_restrict IntegratorShadowState;
typedef const IntegratorShadowStateCPU *ccl_restrict ConstIntegratorShadowState;
# define INTEGRATOR_STATE_NULL nullptr
# define INTEGRATOR_STATE(state, nested_struct, member) ((state)->nested_struct.member)
# define INTEGRATOR_STATE_WRITE(state, nested_struct, member) ((state)->nested_struct.member)
# define INTEGRATOR_STATE_ARRAY(state, nested_struct, array_index, member) \
((state)->nested_struct[array_index].member)
# define INTEGRATOR_STATE_ARRAY_WRITE(state, nested_struct, array_index, member) \
((state)->nested_struct[array_index].member)
#else /* !__KERNEL_GPU__ */
/* Array access on GPU with Structure-of-Arrays. */
typedef int IntegratorState;
typedef int ConstIntegratorState;
typedef int IntegratorShadowState;
typedef int ConstIntegratorShadowState;
# define INTEGRATOR_STATE_NULL -1
# define INTEGRATOR_STATE(state, nested_struct, member) \
kernel_integrator_state.nested_struct.member[state]
# define INTEGRATOR_STATE_WRITE(state, nested_struct, member) \
INTEGRATOR_STATE(state, nested_struct, member)
# define INTEGRATOR_STATE_ARRAY(state, nested_struct, array_index, member) \
kernel_integrator_state.nested_struct[array_index].member[state]
# define INTEGRATOR_STATE_ARRAY_WRITE(state, nested_struct, array_index, member) \
INTEGRATOR_STATE_ARRAY(state, nested_struct, array_index, member)
#endif /* !__KERNEL_GPU__ */
CCL_NAMESPACE_END
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