75a6d3abf7
This adds path guiding features into Cycles by integrating Intel's Open Path Guiding Library. It can be enabled in the Sampling > Path Guiding panel in the render properties. This feature helps reduce noise in scenes where finding a path to light is difficult for regular path tracing. The current implementation supports guiding directional sampling decisions on surfaces, when the material contains a least one diffuse component, and in volumes with isotropic and anisotropic Henyey-Greenstein phase functions. On surfaces, the guided sampling decision is proportional to the product of the incident radiance and the normal-oriented cosine lobe and in volumes it is proportional to the product of the incident radiance and the phase function. The incident radiance field of a scene is learned and updated during rendering after each per-frame rendering iteration/progression. At the moment, path guiding is only supported by the CPU backend. Support for GPU backends will be added in future versions of OpenPGL. Ref T92571 Differential Revision: https://developer.blender.org/D15286
45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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#pragma once
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#include "kernel/device/cpu/compat.h"
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#include "kernel/device/cpu/globals.h"
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CCL_NAMESPACE_BEGIN
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class Profiler;
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/* A special class which extends memory ownership of the `KernelGlobalsCPU` decoupling any resource
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* which is not thread-safe for access. Every worker thread which needs to operate on
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* `KernelGlobalsCPU` needs to initialize its own copy of this object.
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*
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* NOTE: Only minimal subset of objects are copied: `KernelData` is never copied. This means that
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* there is no unnecessary data duplication happening when using this object. */
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class CPUKernelThreadGlobals : public KernelGlobalsCPU {
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public:
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/* TODO(sergey): Would be nice to have properly typed OSLGlobals even in the case when building
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* without OSL support. Will avoid need to those unnamed pointers and casts. */
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CPUKernelThreadGlobals(const KernelGlobalsCPU &kernel_globals,
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void *osl_globals_memory,
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Profiler &cpu_profiler);
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~CPUKernelThreadGlobals();
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CPUKernelThreadGlobals(const CPUKernelThreadGlobals &other) = delete;
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CPUKernelThreadGlobals(CPUKernelThreadGlobals &&other) noexcept;
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CPUKernelThreadGlobals &operator=(const CPUKernelThreadGlobals &other) = delete;
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CPUKernelThreadGlobals &operator=(CPUKernelThreadGlobals &&other);
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void start_profiling();
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void stop_profiling();
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protected:
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void clear_runtime_pointers();
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Profiler &cpu_profiler_;
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};
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CCL_NAMESPACE_END
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