I can't test this till I get home later, but just off the top of my head,
try this:
> while (pos_x < width) {
> /* clear screen to default color */
> ggiSetGCForeground(vis, ggiMapColor(vis, &col));
> ggiFillscreen(vis);
> draw_cross(vis, pos_x, pos_y, fcol);
x = GGI_RP_DONTCARE;
y = GGI_RP_SYNC;
> ggiWaitRayPos(vis, &x, &y);
fprintf (stderr, "Raypos at %i, %i\n", x, y);
> ggiFlush(vis);
> /* update position */
> pos_x+=vx;
> if(pos_x>=width) {
> pos_x=0; i++;
> }
> if(i>10)
> break;
> }
Run with 2> /tmp/err to keep the printf's from burning time. See if the
values outputted are what you'd expect. I haven't really tested WaitRayPos
too thoroughly.
--
Brian
