_ComputeNextLevel
float max = _ComputeNextLevel<float>(data, size, format,
int32 max = _ComputeNextLevel<int32>(data, size, format,
int16 max = _ComputeNextLevel<int16>(data, size, format,
uchar max = _ComputeNextLevel<uchar>(data, size, format,
char max = _ComputeNextLevel<char>(data, size, format,
template<typename T> T _ComputeNextLevel(const void *data,