BufferedPaints

The maximum number of gradient "stops" supported by our native fragment shader implementations. This value has been empirically determined and capped to allow our native shaders to run on all shader-level graphics hardware, even on the older, more limited GPUs. Even the oldest Nvidia hardware could handle 16, or even 32 fractions without any problem. But the first-generation boards from ATI would fall back into software mode (which is unusably slow) for values larger than 12; it appears that those boards do not have enough native registers to support the number of array accesses required by our gradient shaders. So for now we will cap this value at 12, but we can re-evaluate this in the future as hardware becomes more capable.