Locking down framerate to 60Hz
Blitz3D Forums/Blitz3D Beginners Area/Locking down framerate to 60Hz
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| I've been looking around at various ways to lock-down framerate to to a solid 60Hz for a *simple arcade game* using a variety of methods: a) FLIP b) VWAIT: FLIP FALSE c) DELTA-TIME & FRAME-LIMITING CODE I still haven't come across any example when sprites are moving smoothly ALL THE TIME. There always seems to be a moment when the sprites jerk at some point regardless of the methods used. My system is a 1.8GHz CPU with 1GB Ram and a Radeon 9800 Pro on XP SP2 with no other apps running. Can somewhere tell me this IS avoidable, or is Blitz3D always effected in this way ? For example, looking at this delta-timing example (below). Initially it looks fine when user switches to Delta Time but I still get the inevitable "glitch" in the movement: http://home.cmit.net/rwolbeck/programmingtutorial/ Is there better code to avoid these movement "glitches" ? |
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| ADDENDUM: Sorry that link to the delta-time exanple should be: http://home.cmit.net/rwolbeck/programmingtutorial/reference/framelimiter%20example.htm |
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From somewhere deep within this board:; The variable 'old_time' must be set to the current millisecs time at the start of a new game And when returning from a pause. milli_secs = MilliSecs () the_time_taken = milli_secs - old_time ; Calculate the time the Last loop took to execute. If the_time_taken > 100 Then the_time_taken = 100 ; This stops disk accesses And the like from causing jumps in position. game_time = game_time + the_time_taken ; Calculate the value For the 'game_time' variable used with timeouts, etc. Delta_Time# = the_time_taken * 0.001 ;Delta_Time# = the_time_taken / 1000.0 ; Calculate the value for the 'Delta_Time#' variable used to regulate game speed. old_time = milli_secs ; Update the 'old_time' variable with the current time. This doesn't lock the framerate, but makes the movement independent from cpu-power.Just multiply all your timebased code with Delta_Time. Works well for me. |
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| You could simply use a timer set to 60, and then flip false with a waitimer. This is simple, but has problems when out of sinc with moniter refresh rates. |
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| here is answers to all of your questions.. http://home.cmit.net/rwolbeck/programmingtutorial/ |
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| The glitches are unavoidable I think. I see them too, in 2D and 3D. To minimize them, use fullscreen mode and turn of debugging. |
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