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Old 17 December 2011, 22:52   #1
Retro1234
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FPS & Timing calculating

Im running way to fast on 68020 how do I calculate FPS or/and calculate a timer for maintaing a constant speed?
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Old 18 December 2011, 12:51   #2
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Maybe tie your code to only executing during vertical blanking? That would keep the speed at a constant 50fps (60 on NTSC machines) regardless of the clock speed of the processor executing the code.
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Old 18 December 2011, 13:11   #3
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Thank you for your reply and suggestion and I know its being awkward but I would like the timer not to rely on vertical blanking

So im thinking no matter what the cpu I need work out the difference without causing a pause - have a max speed that I can cap.

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Old 18 December 2011, 15:50   #4
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Fair enough

You could setup a timer interrupt which would then allow you to choose (by setting the timer duration) how regularly your code would execute maybe?
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Old 18 December 2011, 17:37   #5
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Umm, so you want to calculate FPS and/or cap frame rate but you don't want to count vertical blanks?! Seems like an oxymoron to me.

Anyway, many years ago with a piece of Blitz2 code I had a problem where sometimes my main loop would run at 50FPS and sometimes it would slow down to 25. I wanted a constant frame rate and felt that 25 FPS was fine. I resolved the issue like this:

Code:
SetInt 5
  VB+1
End SetInt

.mainloop
  VB=0

<some code>

  WHILE VB<2 ; this is where you set your cap
    VWait
  WEND

Goto mainloop
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Old 18 December 2011, 19:26   #6
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Thanks for your replys I think your right ill have to have a play - If anyone else has anything to add please do
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