COM_ocio_color_space_conversion_shader.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include <cstdint>
#include <string>
 
#include "BLI_map.hh"
 
#include "COM_cached_resource.hh"
 
struct GPUShader;
 
namespace blender::compositor {
 
class Context;
 
/* ------------------------------------------------------------------------------------------------
 * OCIO Color Space Conversion Shader Key.
 */
class OCIOColorSpaceConversionShaderKey {
 public:
  std::string source;
  std::string target;
  std::string config_cache_id;
 
  OCIOColorSpaceConversionShaderKey(const std::string &source,
                                    const std::string &target,
                                    const std::string &config_cache_id);
 
  uint64_t hash() const;
};
 
bool operator==(const OCIOColorSpaceConversionShaderKey &a,
                const OCIOColorSpaceConversionShaderKey &b);
 
class GPUShaderCreator;
 
/* -------------------------------------------------------------------------------------------------
 * OCIO Color Space Conversion Shader.
 *
 * A cached resource that creates and caches a GPU shader that converts the source OCIO color space
 * of an image into a different target OCIO color space. */
class OCIOColorSpaceConversionShader : public CachedResource {
 private:
  std::shared_ptr<GPUShaderCreator> shader_creator_;
 
 public:
  OCIOColorSpaceConversionShader(Context &context, std::string source, std::string target);
 
  GPUShader *bind_shader_and_resources();
 
  void unbind_shader_and_resources();
 
  const char *input_sampler_name();
 
  const char *output_image_name();
};
 
/* ------------------------------------------------------------------------------------------------
 * OCIO Color Space Conversion Shader Container.
 */
class OCIOColorSpaceConversionShaderContainer : CachedResourceContainer {
 private:
  Map<OCIOColorSpaceConversionShaderKey, std::unique_ptr<OCIOColorSpaceConversionShader>> map_;
 
 public:
  void reset() override;
 
  /* Check if there is an available OCIOColorSpaceConversionShader 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. */
  OCIOColorSpaceConversionShader &get(Context &context, std::string source, std::string target);
};
 
}  // namespace blender::compositor