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authorKenneth Graunke <[email protected]>2017-02-16 20:05:39 -0800
committerKenneth Graunke <[email protected]>2017-02-21 12:38:13 -0800
commit0a7b252c5b0f5c5c0e114d913d6153bd2cc44ce9 (patch)
treecc6243d9e4ec2ca81b14d2ed084515f5b9a9ad9d /src/util/disk_cache.h
parent0235757422d825c37ca2d2c3feb9e58a28deedd4 (diff)
i965: Enable ARB_transform_feedback2 on Sandybridge.
The only feature over and above ES 3.0 is DrawTransformFeedback(). We already have to do the whole SOL_NUM_PRIMS_WRITTEN counter dance in order to compute the SVBI value for ResumeTransformFeedback(), at which point our existing GetTransformFeedbackVertexCount() implementation will do the trick (though with a stall to CPU map the buffer). Someday, we could probably implement DrawTransformFeedback() more efficiently, using the "Load Internal Vertex Count" feature of 3DSTATE_SVB_INDEX and the 3DPRIMITIVE indirect vertex count bit. Rumor has it this allows people to use WebGL 2.0 on Sandybridge. Note that we don't need pipelined register writes like Gen7+ because we use the 3DSTATE_SVB_INDEX command rather than MI_LOAD_REGISTER_MEM. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99842 Signed-off-by: Kenneth Graunke <[email protected]> Reviewed-by: Iago Toral Quiroga <[email protected]>
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