> Good idea! The "butterflies" done by GLSLang, the stages by JavaScript. > Maybe it's possible to do the reordering (bit-reversed addressing) in a > filter, too.
The catch here is that you're stuck with core image if you want the nice javascript features - it's similar to GLSL but lacking a lot of the more advanced stuff that might be necessary. If not, it could work out. >> They also seem to need two output channels for each input, which could be >> more of an issue. > > Uhm? Maybe you mean the real/imaginary parts? (Though, the input has them, > too.) > Should be easy: we could abuse the color channels, since the transform will > always be done separately for individual color components. Yeah, the real/imaginary parts. The problem is that you do the transform on each colour channel separately, so for rgb you need 6 channels (12 for the two buffers), which likely means 4 buffers in practice. Possible solution: convert the image from rgb to hsv - the V channel contains most of the interesting data, so we can just process that and save a lot of messing about with extra buffers plus 2/3 of the processing (1 channel instead of 3). > And why not then abuse the color channels (we have 4!) for the swap buffers, > too? Yep. If we're going down the HSV route and just processing V, we can use the R + G channels for the real + imaginary values. That leaves two channels to spare so perhaps the H and S channels could sit there if it won't harm performance. Good ideas here, keep them coming :) Chris > > Jens > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/psonice%40gmail.com > > This email sent to [email protected] > _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [email protected]
