bc_kernel

bc_kernel.c

const char* kernel_source[] =
  {
    "sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE |              \n",
    "                    CLK_ADDRESS_NONE            |              \n",
    "                    CLK_FILTER_NEAREST;                        \n",
    "__kernel void kernel_bc(__read_only  image2d_t in,             \n",
    "                        __write_only image2d_t out,            \n",
    "                         float brightness,                     \n",
    "                         float contrast)                       \n",
    "{                                                              \n",
    "  int2 gid = (int2)(get_global_id(0), get_global_id(1));       \n",
    "  float4 in_v  = read_imagef(in, sampler, gid);                \n",
    "  float4 out_v;                                                \n",
    "  out_v.xyz = (in_v.xyz - 0.5f) * contrast + brightness + 0.5f;\n",
    "  out_v.w   =  in_v.w;                                         \n",
    "  write_imagef(out, gid, out_v);                               \n",
    "}                                                              \n",
  }