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/*
This file is part of darktable,
copyright (c) 2021 darktable developers.
darktable is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
darktable is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with darktable. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
kernel void
convolve(read_only image2d_t in, read_only image2d_t kern, write_only image2d_t out,
const int width, const int height, const int radius)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width || y >= height) return;
float4 pix_in = read_imagef(in, samplerA, (int2)(x, y));
float4 acc = 0.f;
for(int l = -radius; l <= radius; l++)
for(int m = -radius; m <= radius; m++)
{
const int ii = clamp(y + l, 0, height - 1);
const int jj = clamp(x + m, 0, width - 1);
const float4 pix = read_imagef(in, samplerA, (int2)(jj, ii));
const int ik = l + radius;
const int jk = m + radius;
const float k = read_imagef(kern, samplerA, (int2)(jk, ik)).x;
acc += k * pix;
}
// copy alpha
acc.w = pix_in.w;
write_imagef(out, (int2)(x, y), acc);
}
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