On 04/06/12 13:33, Christian Costa wrote:
Le 06/04/2012 12:35, Piotr Caban a écrit :
+ /* Simulate a 60Hz display */
+ time = GetTickCount();
+ frame_progress = time& 15; /* time % (1000 / 60) */
+ if (!frame_progress)
+ {
+ *Scanline = 0;
+ return DDERR_VERTICALBLANKINPROGRESS;
+ }
+
+ /* convert frame_progress to estimated scan line */
+ lines = mode.height / 15;
+ *Scanline = (frame_progress - 1) * lines + time % lines;
return DD_OK;
}
Is time % lines here is to generate a random values (sort of noise) ?
Yes. It's mainly there to make the function return more then 16
different values. But it's not guarantying that all of the lines may be
ever returned.
