GL_ARB_texture_gather DONE (i965/gen6+, nv50, llvmpipe, softpipe, swr)
GL_ARB_texture_query_lod DONE (i965, nv50, softpipe)
GL_ARB_transform_feedback2 DONE (i965/gen7+, nv50, llvmpipe, softpipe, swr)
- GL_ARB_transform_feedback3 DONE (i965/gen7+, nv50, llvmpipe, softpipe, swr)
+ GL_ARB_transform_feedback3 DONE (i965/gen7+, llvmpipe, softpipe, swr)
GL 4.1, GLSL 4.10 --- all DONE: i965/gen8+, nvc0, r600, radeonsi