opencl/mono-mixer.cl

   1 __kernel void gegl_mono_mixer (__global const float4 *src_buf,
   2                                __global       float2 *dst_buf,
   3                                const int              preserve_luminocity,
   4                                float                  red,
   5                                float                  green,
   6                                float                  blue)
   7 {
   8   int gid = get_global_id(0);
   9   float4 in_v = src_buf[gid];
  10   float norm_factor = 1.0f;
  11
  12   if (preserve_luminocity)
  13     {
  14       float sum = red + green + blue;
  15       if (sum == 0.0)
  16         norm_factor = 1.0f;
  17       else
  18         norm_factor = fabs (1.0f / sum);
  19     }
  20
  21   dst_buf[gid].x = (in_v.x * red + in_v.y * green + in_v.z * blue) * norm_factor;
  22   dst_buf[gid].y = in_v.w;
  23 }