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Index › Programming Questions & Help › Programs › Performance suffers in present mode
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Performance suffers in present mode (Read 891 times)
morgancodes
Performance suffers in present mode
Oct 1st, 2009, 1:30am  
Hello,

I wasn't sure where to post this. Please let me know if it would be better to post somewhere else.

I have a sketch which does a lot of very fast swapping of images. It rests on image A for a little while, then very quickly flashes image B, then returns to image A.

My sketch works correctly in non-present mode, but when I view it in present mode, the image swaps aren't as smooth. Often, only part of image B gets shown.

Any ideas about why I'm getting worse performance in present mode? I'm using a MacBook 1.83 ghz, 2g ram, OS 10.5.8

Thanks!

-Morgan
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blindfish
Re: Performance suffers in present mode
Reply #1 - Oct 1st, 2009, 1:58am  
Since you haven't posted any code it's worth mentioning this just in case: make sure you load images in setup and not in draw.  That seems to be a common error that can affect performance; though I don't know why it should be affected by present mode.
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Where is the what if the what is in why?
 
morgancodes
Re: Performance suffers in present mode
Reply #2 - Oct 1st, 2009, 6:51am  
Thanks blindfish.
Yeah, I'm loading all my images in setup. The difference is subtle, and wouldn't be noticable if I wasn't trying to do really flickery stuff. But the flickers are definitely less clean in present mode.
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jeffg
Re: Performance suffers in present mode
Reply #3 - Oct 1st, 2009, 8:04am  
Sketch resolution effects performance, so full screen (present) mode may just be pushing more pixels.
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PhiLho 
Re: Performance suffers in present mode
Reply #4 - Oct 1st, 2009, 8:29am  
I was about to answer like jeffg: you can't expect Processing to behave as well in a "small" window and full screen.
You omit to specify the resolution of your screen, BTW...

My understanding is that it still takes some time to display an image, that's a number of pixels to move around. So if your "flash" time is lower than this time (depends on frameRate too), you can get a partial display.
Synchronization with display can be a factor too (although I don't know if it is still relevant with LCD displays...).

Last, you might want to try other graphic modes.
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