COM_bokeh_kernel.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include <cstdint>
#include <memory>
 
#include "BLI_map.hh"
#include "BLI_math_vector_types.hh"
 
#include "GPU_shader.hh"
#include "GPU_texture.hh"
 
#include "COM_cached_resource.hh"
#include "COM_result.hh"
 
namespace blender::realtime_compositor {
 
class Context;
 
/* ------------------------------------------------------------------------------------------------
 * Bokeh Kernel Key.
 */
class BokehKernelKey {
 public:
  int2 size;
  int sides;
  float rotation;
  float roundness;
  float catadioptric;
  float lens_shift;
 
  BokehKernelKey(
      int2 size, int sides, float rotation, float roundness, float catadioptric, float lens_shift);
 
  uint64_t hash() const;
};
 
bool operator==(const BokehKernelKey &a, const BokehKernelKey &b);
 
/* -------------------------------------------------------------------------------------------------
 * Bokeh Kernel.
 *
 * A cached resource that computes and caches a result containing the unnormalized convolution
 * kernel, which when convolved with an image emulates a bokeh lens with the given parameters. */
class BokehKernel : public CachedResource {
 public:
  Result result;
 
 public:
  BokehKernel(Context &context,
              int2 size,
              int sides,
              float rotation,
              float roundness,
              float catadioptric,
              float lens_shift);
 
  ~BokehKernel();
};
 
/* ------------------------------------------------------------------------------------------------
 * Bokeh Kernel Container.
 */
class BokehKernelContainer : CachedResourceContainer {
 private:
  Map<BokehKernelKey, std::unique_ptr<BokehKernel>> map_;
 
 public:
  void reset() override;
 
  /* Check if there is an available BokehKernel cached resource with the given parameters in the
   * container, if one exists, return it, otherwise, return a newly created one and add it to the
   * container. In both cases, tag the cached resource as needed to keep it cached for the next
   * evaluation. */
  Result &get(Context &context,
              int2 size,
              int sides,
              float rotation,
              float roundness,
              float catadioptric,
              float lens_shift);
};
 
}  // namespace blender::realtime_compositor