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Newcomers DBPro Corner / FPS rate not precise

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heyworth83

Years of Service

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Joined: 26th Nov 2002

Location: United Kingdom

Posted: 26th Jul 2003 01:28

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When I use the 'sync rate' command, the sync rate sometimes is above what it should be. (Only usually by about 2-6FPS, but i ask incase this imprecision will affect my program more on a different computer). Is this effect normal?
Thanks.

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IanM

Retired Moderator

Years of Service

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Joined: 11th Sep 2002

Location: In my moon base

Posted: 26th Jul 2003 02:32

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Yes. When you a sync rate, you are advising DBPro that this is the rate you want to use, but DirectX may not be able to provide an exact match.

The way I use to get a closer sync rate is something like this :

+ Code Snippet

global SyncTime as float
global SyncRate as float

SetSyncRate(27)
do
   cls 0
   text 0,0,str$(screen fps())
   DoSync()
loop

function SetSyncRate(Rate as integer)
   sync on
   sync rate 0
   SyncRate = 1000.0 / Rate
   SyncTime = timer() + SyncRate
endfunction

function DoSync()
   while timer() < SyncTime
   endwhile
   SyncTime = SyncTime + SyncRate
   sync
endfunction

It's still not totally exact, but it's close enough for most things.

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Newcomers DBPro Corner / FPS rate not precise