void sort(int min, int max, int digitIndex)
{
if (max - min <= 1)
return;
int exp = (int)System.Math.Pow(multi, digitIndex);
int tailsStart = multi * digitIndex;
int tailsEnd = multi * (digitIndex + 1);
for (int i = 0; i < multi; i++)
UnsafeUtility.WriteArrayElement(histogram, i, 0);
for (int i = min; i < max; i++)
RadixUtil.IncrementArrayElement(histogram, RadixUtil.GetDigit(array, i, exp, multi));
UnsafeUtility.WriteArrayElement(heads, 0, min);
UnsafeUtility.WriteArrayElement(tails, tailsStart, min + UnsafeUtility.ReadArrayElement<int>(histogram, 0));
for (int i = 1; i < multi; i++)
{
UnsafeUtility.WriteArrayElement(heads, i,
UnsafeUtility.ReadArrayElement<int>(heads, i - 1) +
UnsafeUtility.ReadArrayElement<int>(histogram, i - 1));
UnsafeUtility.WriteArrayElement(tails, tailsStart + i,
UnsafeUtility.ReadArrayElement<int>(tails, tailsStart + i - 1) +
UnsafeUtility.ReadArrayElement<int>(histogram, i));
}
uint temp = 0;
for (int i = 0; i < multi; i++)
{
while (UnsafeUtility.ReadArrayElement<int>(heads, i) < UnsafeUtility.ReadArrayElement<int>(tails, tailsStart + i))
{
uint element = UnsafeUtility.ReadArrayElement<uint>(array, UnsafeUtility.ReadArrayElement<int>(heads, i));
int elementIndex = (int)((element / exp) % multi);
while (elementIndex != i)
{
temp = element;
element = UnsafeUtility.ReadArrayElement<uint>(array, UnsafeUtility.ReadArrayElement<int>(heads, elementIndex));
UnsafeUtility.WriteArrayElement(array, UnsafeUtility.ReadArrayElement<int>(heads, elementIndex), temp);
RadixUtil.IncrementArrayElement(heads, elementIndex);
elementIndex = (int)((element / exp) % multi);
}
UnsafeUtility.WriteArrayElement(array, UnsafeUtility.ReadArrayElement<int>(heads, i), (int)element);
RadixUtil.IncrementArrayElement(heads, i);
}
}
digitIndex--;
if (digitIndex >= 0)
{
sort(min, UnsafeUtility.ReadArrayElement<int>(tails, tailsStart), digitIndex);
for (int i = tailsStart + 1; i < tailsEnd; i++)
{
sort(UnsafeUtility.ReadArrayElement<int>(tails, i - 1), UnsafeUtility.ReadArrayElement<int>(tails, i), digitIndex);
}
}
}
