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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
#include "BLI_math_vec_types.hh"
#include "GPU_texture.h"
#include "COM_context.hh"
namespace blender::realtime_compositor {
/* --------------------------------------------------------------------
* Sum Reductions.
*/
/* Computes the sum of the red channel of all pixels in the given texture. */
float sum_red(Context &context, GPUTexture *texture);
/* Computes the sum of the green channel of all pixels in the given texture. */
float sum_green(Context &context, GPUTexture *texture);
/* Computes the sum of the blue channel of all pixels in the given texture. */
float sum_blue(Context &context, GPUTexture *texture);
/* Computes the sum of the luminance of all pixels in the given texture, using the given luminance
* coefficients to compute the luminance. */
float sum_luminance(Context &context, GPUTexture *texture, float3 luminance_coefficients);
/* --------------------------------------------------------------------
* Sum Of Squared Difference Reductions.
*/
/* Computes the sum of the squared difference between the red channel of all pixels in the given
* texture and the given subtrahend. This can be used to compute the standard deviation if the
* given subtrahend is the mean. */
float sum_red_squared_difference(Context &context, GPUTexture *texture, float subtrahend);
/* Computes the sum of the squared difference between the green channel of all pixels in the given
* texture and the given subtrahend. This can be used to compute the standard deviation if the
* given subtrahend is the mean. */
float sum_green_squared_difference(Context &context, GPUTexture *texture, float subtrahend);
/* Computes the sum of the squared difference between the blue channel of all pixels in the given
* texture and the given subtrahend. This can be used to compute the standard deviation if the
* given subtrahend is the mean. */
float sum_blue_squared_difference(Context &context, GPUTexture *texture, float subtrahend);
/* Computes the sum of the squared difference between the luminance of all pixels in the given
* texture and the given subtrahend, using the given luminance coefficients to compute the
* luminance. This can be used to compute the standard deviation if the given subtrahend is the
* mean. */
float sum_luminance_squared_difference(Context &context,
GPUTexture *texture,
float3 luminance_coefficients,
float subtrahend);
} // namespace blender::realtime_compositor
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