/* * 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);}