On Fri, Feb 17, 2017 at 1:56 AM, Kenneth Graunke <kenn...@whitecape.org> wrote: > 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 <kenn...@whitecape.org>
Should update the release notes and features.txt as well. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
