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/*
* Copyright (C) 2011-2019 Karlsruhe Institute of Technology
*
* This file is part of Ufo.
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, either
* version 3 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
kernel void
convolve_abs_laplacian_diff (read_only image2d_t input,
const sampler_t sampler,
global float *output)
{
int idx = get_global_id (0);
int idy = get_global_id (1);
int width = get_global_size (0);
int height = get_global_size (1);
float sum = 0.0f;
float coeffs[3][3] = {{ 1.0f, -2.0f, 1.0f},
{-2.0f, 4.0f, -2.0f},
{ 1.0f, -2.0f, 1.0f}};
for (int dy = -1; dy < 2; dy++) {
for (int dx = -1; dx < 2; dx++) {
sum += coeffs[dy + 1][dx + 1] * read_imagef (input, sampler, (float2) ((idx + dx + 0.5f) / width,
(idy + dy + 0.5f) / height)).x;
}
}
output[idy * width + idx] = fabs (sum);
}
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