2 * Copyright (c) 2018 Danil Iashchenko
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 __kernel void convolution_global(__write_only image2d_t dst,
22 __read_only image2d_t src,
24 __constant float *coef_matrix,
28 const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
29 CLK_ADDRESS_CLAMP_TO_EDGE |
32 const int half_matrix_dim = (coef_matrix_dim / 2);
33 int2 loc = (int2)(get_global_id(0), get_global_id(1));
34 float4 convPix = (float4)(0.0f, 0.0f, 0.0f, 0.0f);
36 for (int conv_i = -half_matrix_dim; conv_i <= half_matrix_dim; conv_i++) {
37 for (int conv_j = -half_matrix_dim; conv_j <= half_matrix_dim; conv_j++) {
38 float4 px = read_imagef(src, sampler, loc + (int2)(conv_j, conv_i));
39 convPix += px * coef_matrix[(conv_i + half_matrix_dim) * coef_matrix_dim +
40 (conv_j + half_matrix_dim)];
43 float4 dstPix = convPix * div + bias;
44 write_imagef(dst, loc, dstPix);