Commits on Jul 30, 2021

1. Octahedral Normal/Tangent Compression …

   Implement Octahedral Compression for normal/tangent vectors
   *Oct32 for uncompressed vectors
   *Oct16 for compressed vectors
   
   Reduces vertex size for each attribute by
   *Uncompressed: 12 bytes, vec4<float32> -> vec2<unorm16>
   *Compressed: 2 bytes, vec4<unorm8> -> vec2<unorm8>
   
   Binormal sign is encoded in the y coordinate of the encoded tangent
   
   Added conversion functions to go from octahedral mapping to cartesian
   for normal and tangent vectors
   
   sprite_3d and soft_body meshes write to their vertex buffer memory
   directly and need to convert their normals and tangents to the new oct
   format before writing
   
   Created a new mesh flag to specify whether a mesh is using octahedral
   compression or not
   Updated documentation to discuss new flag/defaults
   
   Created shader flags to specify whether octahedral or cartesian vectors
   are being used
   
   Updated importers to use octahedral representation as the default format
   for importing meshes
   
   Updated ShaderGLES2 to support 64 bit version codes as we hit the limit
   of the 32-bit integer that was previously used as a bitset to store
   enabled/disabled flags

   

   The-O-King committed Jul 30, 2021
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