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Index › Programming Questions & Help › Programs › blend function
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blend function (Read 1617 times)
playergiro
blend function
Apr 25th, 2005, 8:20pm  
I am writing a fire algorithm that requires computing an average of the surrounding colors at each pixel. i have optimized this as much as i can, but several things i used to do in ASM aren't possible in Java. which is probably good!

but doesn't anyone know if there is a good function, perhaps the blend function (which i only sort-of understand) or an OpenGL function, that can blend 4 or more pixels at once? i guess i'm kind of looking for a high-performance convolution.

i'm getting 4 fps or so on a 50x50 screen, so it's pretty slow.

Geoff
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fry
Re: blend function
Reply #1 - Apr 25th, 2005, 10:00pm  
you should do the image editing inside a PImage object, where you can play with pixels all you want, and then just draw that using image(). otherwise you're dealing with a lot of gl overhead to get and set the pixels.

more info in the PImage reference:
http://processing.org/reference/PImage.html

basically just create the image, then after you mess with it, call updatePixels() on it before drawing to the screen.
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