/* Generate a weave texture with 6 operations per pixel. */

#include <stdlib.h>
#include "ppmp6.h"

enum { ww = 512, hh = 512 };
ppm_p6_color image[hh][ww];

int main(int argc, char **argv)
{
  ppm_p6_color palette[] = {
    { .r = .3, .g = .3, .b = .3 },
    { .r = .8, .g = .8, .b = 1 },
    { .r = 1,  .g = 1,  .b = .8 },
  };
  int mask = 4;
  if (argc > 1) mask = atoi(argv[1]) << 2; /* 1 is default; try 2, 3, 4, 5 */
  
  for (int y = 0; y < hh; y++) {
    for (int x = 0; x < ww; x++) {
      image[y][x] = palette[(x^y) & mask ? (x ^ x>>1) & 1 : (y ^ y<<1) & 2];
    }
  }

  ppm_p6_output_image(image[0], ww, hh);
  return 0;
}