i am wondering...:
i have a vast chain of slabs doing all sorts of complicated things very nicely... but now i need to know just wether the luminance of one of these textures in between is above or below a certain threshhold. i searched for quite a bit but it seems i really have to readback to cpu for this... do i?
i attached what i currently do below... as soon as i connect it, i get a 20 fps framedrop - even with this tiny texture.
if i really have to read back, can this been done more efficiently?