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/*
* Copyright (c) 2018 Danil Iashchenko
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
__kernel void convolution_global(__write_only image2d_t dst,
__read_only image2d_t src,
int coef_matrix_dim,
__constant float *coef_matrix,
float div,
float bias)
{
const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
CLK_ADDRESS_CLAMP_TO_EDGE |
CLK_FILTER_NEAREST);
const int half_matrix_dim = (coef_matrix_dim / 2);
int2 loc = (int2)(get_global_id(0), get_global_id(1));
float4 convPix = (float4)(0.0f, 0.0f, 0.0f, 0.0f);
for (int conv_i = -half_matrix_dim; conv_i <= half_matrix_dim; conv_i++) {
for (int conv_j = -half_matrix_dim; conv_j <= half_matrix_dim; conv_j++) {
float4 px = read_imagef(src, sampler, loc + (int2)(conv_j, conv_i));
convPix += px * coef_matrix[(conv_i + half_matrix_dim) * coef_matrix_dim +
(conv_j + half_matrix_dim)];
}
}
float4 dstPix = convPix * div + bias;
write_imagef(dst, loc, dstPix);
}
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