From: Chris Atenasio (chris@crud.net)
Date: Thu 13 Jan 2000 - 04:42:49 IST
> > vga_waitretrace() does indeed seem to do what I want.I've read the man > > page, but it does not state whether the function returns when the beam > > gets to the bottom right of the screen, or if it returns after it > > returns to the top left of the screen to begin retracing.Does anyone > > know? > > It seems to me that the function returns at the end of the retrace. Would it make sense then to keep an internal timer, calibrated with vga_waitretrace(), and sync draws to that? Lets see, 200,000 hz cpu / 70 hz refresh gives ~2857 cpu cycles between refreshes. Take into account that the retrace is a fraction of the refresh time, and you are dealing with somewhere < 2857 cycles, which is fine for something simple, but wont give you time to blit images. Then again I may be calculating something wrong... shrug :) - Chris ------------------------------------------------------------------------ Chris Atenasio <chris@crud.net> - Friends don't let friends use Windows. Send mail subject "send pgp key" or "word of the day" for auto-response. Today's word of the day: bounces
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