Copy our stable attrs into a buffer; splat that 4x.
Copy our stable attrs into a buffer; splat that 4x.

This also makes it easier for a derived shader to add additional stable
attributes if desired.

playn/playn,playn/playn,tinkerstudent/playn,ruslansennov/playn2,rachelharvey/playn,longtaoge/playn,thecocce/playn-1,rachelharvey/playn,longtaoge/playn,playn/playn,tinkerstudent/playn,thecocce/playn-1,ruslansennov/playn2