- // All destination textures must be exactly of size <width> x <height>.
- // width and height can not be zero.
+ // All destination textures must be exactly of size <width> x <height>,
+ // and must either come from the same ResourcePool the effect uses, or outlive
+ // the EffectChain (otherwise, we could be allocating FBOs that end up being
+ // stale). width and height can not be zero.