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/*
* 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 unsharp_global(__write_only image2d_t dst,
__read_only image2d_t src,
int size_x,
int size_y,
float amount,
__constant float *coef_matrix)
{
const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
CLK_FILTER_NEAREST);
int2 loc = (int2)(get_global_id(0), get_global_id(1));
int2 centre = (int2)(size_x / 2, size_y / 2);
float4 val = read_imagef(src, sampler, loc);
float4 sum = 0.0f;
int x, y;
for (y = 0; y < size_y; y++) {
for (x = 0; x < size_x; x++) {
int2 pos = loc + (int2)(x, y) - centre;
sum += coef_matrix[y * size_x + x] *
read_imagef(src, sampler, pos);
}
}
write_imagef(dst, loc, val + (val - sum) * amount);
}
__kernel void unsharp_local(__write_only image2d_t dst,
__read_only image2d_t src,
int size_x,
int size_y,
float amount,
__constant float *coef_x,
__constant float *coef_y)
{
const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
CLK_ADDRESS_CLAMP_TO_EDGE |
CLK_FILTER_NEAREST);
int2 block = (int2)(get_group_id(0), get_group_id(1)) * 16;
int2 pos = (int2)(get_local_id(0), get_local_id(1));
__local float4 tmp[32][32];
int rad_x = size_x / 2;
int rad_y = size_y / 2;
int x, y;
for (y = 0; y <= 1; y++) {
for (x = 0; x <= 1; x++) {
tmp[pos.y + 16 * y][pos.x + 16 * x] =
read_imagef(src, sampler, block + pos + (int2)(16 * x - 8, 16 * y - 8));
}
}
barrier(CLK_LOCAL_MEM_FENCE);
float4 val = tmp[pos.y + 8][pos.x + 8];
float4 horiz[2];
for (y = 0; y <= 1; y++) {
horiz[y] = 0.0f;
for (x = 0; x < size_x; x++)
horiz[y] += coef_x[x] * tmp[pos.y + y * 16][pos.x + 8 + x - rad_x];
}
barrier(CLK_LOCAL_MEM_FENCE);
for (y = 0; y <= 1; y++) {
tmp[pos.y + y * 16][pos.x + 8] = horiz[y];
}
barrier(CLK_LOCAL_MEM_FENCE);
float4 sum = 0.0f;
for (y = 0; y < size_y; y++)
sum += coef_y[y] * tmp[pos.y + 8 + y - rad_y][pos.x + 8];
if (block.x + pos.x < get_image_width(dst) &&
block.y + pos.y < get_image_height(dst))
write_imagef(dst, block + pos, val + (val - sum) * amount);
}
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