[Mesa-dev] RFC: vega handle rework

[Brian Paul]

The vega state tracker casts back and forth between pointers and the 
handle types (VGHandle, VGPath, VGImage, etc).  Since handles are 
always 32-bit VGuints, casting like this doesn't work with 64-bit 
pointers.

This patch series implementes a pointer/handle mapping mechanism with 
a hash table.

If there's no concerns I'll commit in a day or two.

-Brian


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