/*
  * 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);
 }