85 lines
2.8 KiB
C++
Executable File
85 lines
2.8 KiB
C++
Executable File
/*
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* Copyright (C) 2015 The Android Open Source Project
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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 IBL_CUBEMAPIBL_H
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#define IBL_CUBEMAPIBL_H
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#include <math/vec3.h>
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#include <functional>
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#include <vector>
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#include <stdint.h>
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#include <stddef.h>
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namespace utils {
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class JobSystem;
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} // namespace utils
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namespace filament {
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namespace ibl {
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class Cubemap;
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class Image;
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/**
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* Generates cubemaps for the IBL.
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*/
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class CubemapIBL {
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public:
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using Progress = std::function<void(size_t, float)>;
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/**
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* Computes a roughness LOD using prefiltered importance sampling GGX
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*
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* @param dst the destination cubemap
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* @param levels a list of prefiltered lods of the source environment
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* @param linearRoughness roughness
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* @param maxNumSamples number of samples for importance sampling
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* @param updater a callback for the caller to track progress
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*/
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static void roughnessFilter(
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utils::JobSystem& js, Cubemap& dst, const std::vector<Cubemap>& levels,
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float linearRoughness, size_t maxNumSamples, math::float3 mirror, bool prefilter,
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Progress updater = {});
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//! Computes the "DFG" term of the "split-sum" approximation and stores it in a 2D image
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static void DFG(utils::JobSystem& js, Image& dst, bool multiscatter, bool cloth);
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/**
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* Computes the diffuse irradiance using prefiltered importance sampling GGX
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*
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* @note Usually this is done using spherical harmonics instead.
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*
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* @param dst the destination cubemap
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* @param levels a list of prefiltered lods of the source environment
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* @param maxNumSamples number of samples for importance sampling
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* @param updater a callback for the caller to track progress
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*
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* @see CubemapSH
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*/
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static void diffuseIrradiance(utils::JobSystem& js, Cubemap& dst, const std::vector<Cubemap>& levels,
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size_t maxNumSamples = 1024, Progress updater = {});
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// for debugging. ignore.
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static void brdf(utils::JobSystem& js, Cubemap& dst, float linearRoughness);
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};
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} // namespace ibl
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} // namespace filament
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#endif /* IBL_CUBEMAPIBL_H */
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