gistfile1.cl

const char* s_mapPixelKernelSource = "\n" \
"__kernel void mapPixel(                                                \n" \
"    __global uchar* output,                                            \n" \
"    __global uchar4* input,                                            \n" \
"    __constant float4* pal,                                            \n" \
"    const unsigned int palCount,                                       \n" \
"    const unsigned int width)                                          \n" \
"{                                                                      \n" \
"   const int xOut = get_global_id(0);	                                \n" \
"   const int yOut = get_global_id(1);					\n" \
"   const int offset = (yOut * width) + xOut;				\n" \
"   uint i, bestIndex = 0;                                              \n" \
"   float bestDist = MAXFLOAT;                                          \n" \
"                                                                       \n" \
"   float4 pixel = convert_float4(input[offset]);                       \n" \
"   for (i = 0; i < palCount; ++i)                                      \n" \
"   {                                                                   \n" \
"      float4 diff = pixel - pal[i];                                    \n" \
"      float dist = dot(diff, diff);                                    \n" \
"      if (dist < bestDist)                                             \n" \
"      {                                                                \n" \
"          bestDist = dist;                                             \n" \
"          bestIndex = i;                                               \n" \
"      }                                                                \n" \
"   }                                                                   \n" \
"                                                                       \n" \
"   output[offset] = (uchar)bestIndex;                                  \n" \
"}                                                                      \n" \
"\n";