* implement texture get data
* reset all state before blit & clone state
* format
* support blit regions
* implement source region for blit
* replace bottom with top
* account for 0 size
* support image flipping
* revert presentation fixes & y flip
* revert
* flip viewport vertically
* switch face winding
* comment
* use SetBytes for texture clear
* implement missing compute builtins
* change storage and texture buffer alignment
* correct compute builtins
* don't use nullable for textures and samplers
* remove incorrect texture get data implementation
* Cleanup IntPtrs
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Co-authored-by: Isaac Marovitz <isaacryu@icloud.com>
