894c7fa4e2
This only changes file and function names. The EEVEE identifier is still `BLENDER_EEVEE_NEXT`. No functional changes.
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/* SPDX-FileCopyrightText: 2021 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup eevee
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*
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* Postprocess diffuse radiance output from the diffuse evaluation pass to mimic subsurface
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* transmission.
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*
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* This implementation follows the technique described in the SIGGRAPH presentation:
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* "Efficient screen space subsurface scattering SIGGRAPH 2018"
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* by Evgenii Golubev
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*
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* But, instead of having all the precomputed weights for all three color primaries,
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* we precompute a weight profile texture to be able to support per pixel AND per channel radius.
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*/
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#pragma once
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#include "eevee_shader.hh"
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#include "eevee_shader_shared.hh"
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namespace blender::eevee {
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/* -------------------------------------------------------------------- */
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/** \name Subsurface
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*
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* \{ */
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class Instance;
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struct SubsurfaceModule {
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private:
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Instance &inst_;
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/** Contains samples locations. */
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SubsurfaceData &data_;
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/** Scene diffuse irradiance. Pointer binded at sync time, set at render time. */
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GPUTexture *direct_light_tx_;
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GPUTexture *indirect_light_tx_;
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/** Input radiance packed with surface ID. */
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TextureFromPool radiance_tx_;
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TextureFromPool object_id_tx_;
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/** Setup pass fill the radiance_id_tx_ for faster convolution. */
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PassSimple setup_ps_ = {"Subsurface.Prepare"};
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int3 setup_dispatch_size_ = {1, 1, 1};
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/** Screen space convolution pass. */
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PassSimple convolve_ps_ = {"Subsurface.Convolve"};
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SubsurfaceTileBuf convolve_tile_buf_;
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DispatchIndirectBuf convolve_dispatch_buf_;
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public:
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SubsurfaceModule(Instance &inst, SubsurfaceData &data) : inst_(inst), data_(data)
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{
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/* Force first update. */
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data_.sample_len = -1;
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};
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~SubsurfaceModule(){};
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void end_sync();
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/* Process the direct & indirect diffuse light buffers using screen space subsurface scattering.
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* Result is stored in the direct light texture. */
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void render(GPUTexture *direct_diffuse_light_tx,
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GPUTexture *indirect_diffuse_light_tx,
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eClosureBits active_closures,
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View &view);
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private:
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void precompute_samples_location();
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/** Christensen-Burley implementation. */
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static float burley_sample(float d, float x_rand);
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static float burley_eval(float d, float r);
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static float burley_pdf(float d, float r);
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};
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/** \} */
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} // namespace blender::eevee
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