texture_pool.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <cstdint>
 
#include "BLI_hash.hh"
#include "BLI_map.hh"
#include "BLI_math_vector_types.hh"
#include "BLI_vector.hh"
 
#include "GPU_texture.hh"
 
#include "COM_texture_pool.hh"
 
namespace blender::realtime_compositor {
 
/* -------------------------------------------------------------------- */
TexturePoolKey::TexturePoolKey(int2 size, eGPUTextureFormat format) : size(size), format(format) {}
 
TexturePoolKey::TexturePoolKey(const GPUTexture *texture)
{
  size = int2(GPU_texture_width(texture), GPU_texture_height(texture));
  format = GPU_texture_format(texture);
}
 
uint64_t TexturePoolKey::hash() const
{
  return get_default_hash(size.x, size.y, format);
}
 
bool operator==(const TexturePoolKey &a, const TexturePoolKey &b)
{
  return a.size == b.size && a.format == b.format;
}
 
/* -------------------------------------------------------------------- */
GPUTexture *TexturePool::acquire(int2 size, eGPUTextureFormat format)
{
  /* Check if there is an available texture with the required specification, and if one exists,
   * return it. */
  const TexturePoolKey key = TexturePoolKey(size, format);
  Vector<GPUTexture *> &available_textures = textures_.lookup_or_add_default(key);
  if (!available_textures.is_empty()) {
    return available_textures.pop_last();
  }
 
  /* Otherwise, allocate a new texture. */
  return allocate_texture(size, format);
}
 
void TexturePool::release(GPUTexture *texture)
{
  textures_.lookup(TexturePoolKey(texture)).append(texture);
}
 
void TexturePool::reset()
{
  textures_.clear();
}
 
}  // namespace blender::realtime_compositor