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Re: OpenGL texturing
On Wed, 2 Apr 2003 14:04:39 +0200
Francesco Orsenigo <firstname.lastname@example.org> wrote:
> I'd need to perform many pixel-by-pixel color transformations: is this
> possible after the texture is loaded?
> for(each pixel)
> if(pixel->red != 0 || pixel->blue != 0)
> draw pixel; //draw the original pixel as is
> draw table[pixel->green]; //use the green value to
> a different color
How big are the textures you are using for this? Is there a pattern to the
changes? If so, could you precalculate a set of textures in main memory and
use glTexSubImage2D to update the texture in video memory?