Cube  Diff

	if (hasoverbright) {
		l /= lightscale;
		stepl /= lightscale;

		// coloured light version, special case because most lights are
		// white
		if (light.attr3 || light.attr4) {
			int dimness = rnd(
			    (255 -
			        (light.attr2 + light.attr3 + light.attr4) / 3) /
			        16 +
			    1);
			x += stepx * dimness;
			y += stepy * dimness;

			if (OUTBORD(x >> PRECBITS, y >> PRECBITS))
				return;

			int g = light.attr3 << PRECBITS;

}

// median filter, smooths out random noise in light and makes it more mipable
void
postlightarea(const struct block *a)
{
	// assumes area not on edge of world
	for (int x = 0; x < a->xs; x++)
		for (int y = 0; y < a->ys; y++) {
			struct sqr *s = S(x + a->x, y + a->y);


#define median(m)                                                            \
	s->m =                                                               \
	    (s->m * 2 + SW(s, 1, 0)->m * 2 + SW(s, 0, 1)->m * 2 +            \
	        SW(s, -1, 0)->m * 2 + SW(s, 0, -1)->m * 2 + SW(s, 1, 1)->m + \
	        SW(s, 1, -1)->m + SW(s, -1, 1)->m + SW(s, -1, -1)->m) /      \
	    14; // median is 4/2/1 instead
			median(r);
			median(g);
			median(b);
		}


	remip(a, 0);
}

void
calclight()
{