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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
#include <cstdint>
#include "BLI_math_vec_types.hh"
#include "GPU_shader.h"
#include "GPU_texture.h"
#include "COM_cached_resource.hh"
namespace blender::realtime_compositor {
/* ------------------------------------------------------------------------------------------------
* Symmetric Blur Weights Key.
*/
class SymmetricBlurWeightsKey {
public:
int type;
float2 radius;
SymmetricBlurWeightsKey(int type, float2 radius);
uint64_t hash() const;
};
bool operator==(const SymmetricBlurWeightsKey &a, const SymmetricBlurWeightsKey &b);
/* -------------------------------------------------------------------------------------------------
* Symmetric Blur Weights.
*
* A cached resource that computes and caches a 2D GPU texture containing the weights of the filter
* of the given type and radius. The filter is assumed to be symmetric, because the filter
* functions are evaluated on the normalized distance to the center. Consequently, only the upper
* right quadrant are computed and the shader takes that into consideration. */
class SymmetricBlurWeights : public CachedResource {
private:
GPUTexture *texture_ = nullptr;
public:
SymmetricBlurWeights(int type, float2 radius);
~SymmetricBlurWeights();
void bind_as_texture(GPUShader *shader, const char *texture_name) const;
void unbind_as_texture() const;
};
} // namespace blender::realtime_compositor
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