public static extern CLError clGetSamplerInfo( CLSampler sampler, CLSamplerInfo param_name, SizeT param_value_size, IntPtr param_value, ref SizeT param_value_size_ret);
internal static extern CLError clGetSamplerInfo(CLSampler sampler, CLSamplerInfo param_name, SizeT param_value_size, IntPtr param_value, ref SizeT param_value_size_ret);