[Fluxus] (build-pixels) textures

[gabor papp]

> I don't see the goal of the alternating frame  variable value
> and why don't shorten this in this, using only one texture:
it's not possible. it's an opengl limitation. a pixel-primitive is a 
framebuffer object (fbo) in opengl. this means you can render content into 
it. you can attach textures to an fbo, these are the pixel-primitive 
textures. it is not possible to render into a texture, and use that 
texture at the same time. that's why the texture switching is necessary.

> The other Gabor example "pixels.scm" seems to me quite confusing too with
> this balanced frame variable.
the frame variable is only switching between 0 and 1. nothing complex, but 
solved in a geeky way with bitwise-xor, which is shorter then the 
remainder.

> But can I use the different pixels primitives textures to do sort of
> multitexturing, or I'm misunderstanding this.
i'm not sure i understand the question. you can use pixel-primitive 
textures for multitexturing. there's a second parameter of 
(pixels->texture), to ask for the texture with the given the texture 
index.

best,
gabor