bayer-gen.c

#include <stdio.h>
#include <stdlib.h>

const int seed[2][2] = {{0, 2}, {3, 1}};

int main(int argc, char *argv[])
{
        unsigned x, y, m = 3;
        if (argc == 2)
                m = atoi(argv[1]);
        if (argc > 2 || m < 1 || m > sizeof(int) * 4)
                fprintf(stderr, "usage: %s [mag]\n", argv[0]), exit(-1);
        for (y = 0; y < 1 << m; ++y, putchar('\n'))
                for (x = 0; x < 1 << m; ++x) {
                        unsigned i, v = 0;
                        for (i = 0; i < m; ++i)
                                v = 4 * v + seed[(x >> i) % 2][(y >> i) % 2];
                        printf("%u ", v);
                }
        return 0;
}