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/*
* Copyright (C) 2011-2013 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
filter (global float *input,
global float *output,
global float *filter)
{
const int idx = get_global_id(0);
const int idy = get_global_id(1);
const int index = idy*get_global_size(0) + idx;
output[index] = input[index] * filter[idx];
}
kernel void
stripe_filter (global float *input,
global float *output,
const float horizontal_sigma,
const float vertical_sigma)
{
const int idx = get_global_id(0);
const int idy = get_global_id(1);
const int width = get_global_size(0);
const int height = get_global_size(1);
const int index = idy * get_global_size(0) + idx;
/* Swap frequencies for interleaved complex input */
/* No need to negate the second half of frequencies for Gaussian */
const float x = idx >= width >> 1 ? (width >> 1) - (idx >> 1) : idx >> 1;
const float x_weight = exp (- x * x / (2 * horizontal_sigma * horizontal_sigma));
if (vertical_sigma == 0.0f) {
if (idy == 0) {
output[index] = input[index] * x_weight;
} else {
output[index] = input[index];
}
} else {
const float y = idy >= height >> 1 ? height - idy : idy;
const float y_weight = exp (- y * y / (2 * vertical_sigma * vertical_sigma));
output[index] = input[index] * (1 - y_weight * (1 - x_weight));
}
}
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