- Fixes likelihood that fastmem allocation succeeds.

- Newer drivers report this as supported, but it is broken.

- Ensures correct placement until we have better overlay configuration.

This crashes their shader compiler for some reason.

These formats are unsupported by mobile GPUs so they need to be emulated in shaders instead.

Regular descriptors are around 1.5x faster to update.

This causes crashes during compilation on several 6xx and 5xx driver versions.