* 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>
First special instruction
Start Load/Store implementation
Start TextureSample
Sample progress
I/O Load/Store Progress
Rest of load/store
TODO: Currently, the generator still assumes the GLSL style of I/O attributres. On MSL, the vertex function should output a struct which contains a float4 with the required position attribute.
TextureSize and VectorExtract
Fix UserDefined IO Vars
Fix stage input struct names
