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Game Timing - Rely on vsync?

SikCiv · 1999-11-24T18:38:00

My platform game is controlled by a mmtimer to maintain the speed of the background and sprites, BUT since the screen syncs from 30 to 75 FPS (depending on the system) the blits appear to be out of time, sometimes missing some frames. This is because the mmtimer isnt in sync with the screen flips. Is there a way to set the DDraw Fullscreen video frequency to say 60Hz on every system so my blits are in sync? How does everyone control the timing? Also, if I use the vsync to control the screen animation speed, my game will slow down on slower machines! How do I overcome this problem? (I remember in DOS 320x200 the vsync was always constant on all systems, so controlling animation was easy) hhheeelllpppp )-; Machine.. P2/35064MB, i740 8MB, @ 640x480x16bit

General and Gameplay Programming Programming

Started by SikCiv November 24, 1999 06:38 PM

9 comments, last by SikCiv 24 years, 7 months ago

SikCiv

122

Author

November 24, 1999 06:38 PM

My game's timing is run by a multimedia timer, I dont know if it is using the same hardware as QueryPerformanceTimer, but I have ran my game on many systems including a Toshiba 200CDS (p120), a Toshiba celeron based laptop, and a p2/350 desktop with no problems. Is it safe to assume the multimedia timer will run on all pentium machines? Or are there some systems, like the pentium equivilent AMD series that dont support the mmtimer?

Is there a limit to how many programs running at the same time that use multimedia timers?

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