eevee_subsurface.hh

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/* SPDX-FileCopyrightText: 2021 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "eevee_shader.hh"
#include "eevee_shader_shared.hh"
 
namespace blender::eevee {
 
/* -------------------------------------------------------------------- */
class Instance;
 
struct SubsurfaceModule {
 private:
  Instance &inst_;
  SubsurfaceData &data_;
  GPUTexture *direct_light_tx_;
  GPUTexture *indirect_light_tx_;
  TextureFromPool radiance_tx_;
  TextureFromPool object_id_tx_;
  PassSimple setup_ps_ = {"Subsurface.Prepare"};
  int3 setup_dispatch_size_ = {1, 1, 1};
 
  PassSimple convolve_ps_ = {"Subsurface.Convolve"};
  SubsurfaceTileBuf convolve_tile_buf_;
  DispatchIndirectBuf convolve_dispatch_buf_;
 
 public:
  SubsurfaceModule(Instance &inst, SubsurfaceData &data) : inst_(inst), data_(data)
  {
    /* Force first update. */
    data_.sample_len = -1;
  };
 
  ~SubsurfaceModule(){};
 
  void end_sync();
 
  /* Process the direct & indirect diffuse light buffers using screen space subsurface scattering.
   * Result is stored in the direct light texture. */
  void render(GPUTexture *direct_diffuse_light_tx,
              GPUTexture *indirect_diffuse_light_tx,
              eClosureBits active_closures,
              View &view);
 
 private:
  void precompute_samples_location();
 
  static float burley_sample(float d, float x_rand);
  static float burley_eval(float d, float r);
  static float burley_pdf(float d, float r);
};
 
}  // namespace blender::eevee