On Sat, 2007-02-17 at 06:32 +1100, Item State wrote:
unfortunately i have the same problem with your patch (psychedelic colours). the [colorRGB] is pretty cool, it does exactly what i want, but this only works here with [pix_texture] but have no effect when using [pix_draw] instead...
i hope i can clarify this a bit in my own (maybe not too correct) words. there are actually two different domains in Gem: opengl and 'pix'es. all opengl-based stuff is renderend on the gpu (graphic card's cpu), whereas all pixel-based objects are calculated on the cpu. playing and processing videos and pictures happens in the pix-domain (afaik, all pix_*-objects work in that domain). pix_texture is used to convert an image (from a picture or a video) to a texture, that can be applied to a vertex . that means the picture is then in the opengl-domain and cannot be processed with pix_*-objects anymore. so there are actually two (or more?) ways of alpha-blending a picture:
- do everything in the pix-domain and use [pix_alpha] (i'm not quite
sure anymore about that) 2) give it to the opengl-domain using [pix_texture] and use the fourth (alpha-channel-)inlet of [colorRGB]. the latter approach has the advantage, that everything is rendered on gpu, which saves you a lot of cpu-power. whenever you can, i would do stuff in the opengl-domain (unless you don't have any 3d-acceleration enabled).
i hope i didn't tell you something completely wrong (please someone correct me, if i did)
roman
Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de