Silva Pro

FIXED
* Major FPS regression (60+ dropping to ~30): the default shadow map
had been changed to 768px, which is not a power of two - several
older iGPU drivers fall off their fast path filtering NPOT depth
textures and the "cheaper" map ends up slower. All shadow map sizes
are power-of-two now (512 / 1024 / 2048 / 4096); default is 1024
* The new analytic moon could produce NaN pixels when the moon passed
directly overhead; NaNs spread through the bloom blur and crawl old
GPUs. Guarded

PERFORMANCE
* SSAO now fades out at 64 blocks instead of 96 - it is a near-field
effect and was never visible that far away