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
+EXT_packed_float support.
+ARB_depth_buffer_float support.
+EXT_framebuffer_sRGB support.
+MSAA support.
Goal: extension parity with softpipe:
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-GL3.0 support.
-EXT_timer_query - airlied posted a patch