+reset_rocks(void)
+{
+ int i;
+
+ for(i = 0; i<MAXROCKS; i++) rock[i].active = 0;
+ nrocks = I_ROCKS;
+ nrocks_timer = 0;
+}
+
+enum { LEFT, RIGHT, TOP, BOTTOM };
+
+void
+rock_timer_increments(float *ti)
+{
+ float dx0,dx1, dy0,dy1;
+ float hfactor, vfactor;
+ int i;
+
+ for(i=0; i<4; i++) ti[i] = 0;
+ hfactor = nrocks/KH; vfactor = nrocks/KV;
+
+ dx0 = -RDX - screendx; dx1 = RDX - screendx;
+ dy0 = -RDY - screendy; dy1 = RDY - screendy;
+
+ if(dx0 != 0) {
+ if(dx0 < 0) {
+ if(dx1 < 0) ti[RIGHT] = -(dx0+dx1)/2;
+ else {
+ ti[RIGHT] = -dx0/2;
+ ti[LEFT] = dx1/2;
+ }
+ } else ti[LEFT] = (dx0+dx1)/2;
+ }
+ ti[LEFT] *= hfactor;
+ ti[RIGHT] *= hfactor;
+
+ if(dy0 != 0) {
+ if(dy0 < 0) {
+ if(dy1 < 0) ti[BOTTOM] = -(dy0+dy1)/2;
+ else {
+ ti[BOTTOM] = -dy0/2;
+ ti[TOP] = dy1/2;
+ }
+ } else ti[TOP] = (dy0+dy1)/2;
+ }
+ ti[TOP] *= vfactor;
+ ti[BOTTOM] *= vfactor;
+}
+
+void