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Weird DeWitter's Game Loop Problem

Alejandro · 2013-02-13T03:20:17

So I've been searching and studying up on game loops and decided to go with deWitter's(the final version with interpolation). Yesterday I implemented the loop into a simple test game to see how it works, and it worked fine. My little circle would move across the screen very smoothly with no problems at all, so I saved everything and took a break.Okay.. now here's the problem: I came back later to check it out again, but this time there was a slight stutter when the circle moved! I had no other winndows open, only CodeBlocks and the program, but when i first successfully tried it, I had Chrome open. so I tried it again with chrome open, and it didn't stutter! but when I try it with nothing open, there's that small stutter again. I looked at the code over and over, and it was exactly like the code from the (site), so I am positive it is not a problem with my code.It's very confusing because it Really does work fine,the small stutter is very subtle, but it is there. I am using SFML 2, so maybe there is a problem with the clock function? What do you guys think? Is this even a programming problem or just my pc?

General and Gameplay Programming Programming

Started by handoman February 08, 2013 03:32 AM

12 comments, last by handoman 11 years, 2 months ago

handoman

219

Author

February 12, 2013 10:39 PM

I decided to created a log and output the time since each update into a file... if the game loop was working right, the time time between each frame should be the same right? well there were slightly different:(here is just some of the times)

0.0167939

0.0197271

0.0204671

0.0206342

0.0188694

0.0201671

0.0196725

0.0219421

0.0180132

0.020587

0.0197747

are these times close enough, or should the game loop really be calling the update equally every time??

L. Spiro

25,818

February 12, 2013 10:49 PM

The actual time between frames?

They will generally be close as long as nothing is moving around on your screen, and as long as you are not writing times to a file every frame.

Print to the debug console—it is still laggy but less so than writing to a file.

OutputDebugString().

Also, waiting for v-sync can cause different delays between frames.

L. Spiro

I restore Nintendo 64 video-game OST’s into HD! https://www.youtube.com/channel/UCCtX_wedtZ5BoyQBXEhnVZw/playlists?view=1&sort=lad&flow=grid

handoman

219

Author

February 13, 2013 12:56 AM

ah okay, I'm not gunna bother with the code anymore, the game loop and timing are pretty precise ..gunna go try it on other computers to be sure its not just mine... or I'll just have to play with Chrome open all the time! thanks for the help guys, Ill probly be back when it doesnt work

handoman

219

Author

February 13, 2013 03:20 AM

okay, I actually now concluded that its not the code...its my comp:

I ran the exe(not with code::blocks) on my pc, and the situation is the same. but then I take it to my dad's laptop and it runs normal and smooth no matter what else is open! gunna start comparing all of our setting and stuff.

Weird DeWitter's Game Loop Problem

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Weird DeWitter's Game Loop Problem

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