TODO covering gallivm/llvmpipe
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Goal: GL3.0 support in llvmpipe
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TXQ opcode support - airlied WIP
TXF opcode support.
Integer texture fetch support
Integer renderbuffer support
Vertex ID support.
EXT_transform_feedback support - airlied WIP
clip distance support - airlied WIP
vertex clip support - airlied WIP
EXT_texture_array support - Jakob WIP
Goal: extension parity with softpipe:
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GL3.0 support.
EXT_timer_query - airlied posted a patch