Simplified version of creating morton codes from 2 numbers in range [0; 8). Useful for converting local thread index in compute shader to a flattened one for downsampling

EncodeMorton3Bit.c

#include <stdio.h>

int MortonShuffle3Bit(int x)
{
    return (x & 0x1) | ((x & 0x2) << 1) | ((x & 0x4) << 2);
}

int EncodeMorton3Bit(int x, int y)
{
    return (MortonShuffle3Bit(y) << 1) | MortonShuffle3Bit(x);
}

int main(void) 
{
    for (int y = 0; y < 8; ++y)
    {
        for (int x = 0; x < 8; ++x)
        {
            printf("%2d ", EncodeMorton3Bit(x, y));
        }
        printf("\n");
    }
    return 0;
}