[Bug 84677] Triangle disappears with glPolygonMode GL_LINE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84677

--- Comment #7 from Neil Roberts <neil at linux.intel.com> ---
I don't have any Broadwell hardware to test on but I tried it with Skylake
after doing the change for gen8_emit_vertices but for some reason it doesn't
fix the bug. It looks like neither the edge flags nor the vertex ID are working
because the test case draws all 6 points in the same location. I confirmed this
by setting the blend mode to additive. It's a bit surprising because it really
looks like the same problem should apply on Gen8+. It'd be great if someone
could test it on Broadwell.

In the meantime I don't think it would do any harm to land the existing patch
as is and then fix Gen8+ later if someone wants to review it. It would be good
to get Ken's opinion as he wrote a comment in gen8_emit_vertices about needing
to swap the attributes so he may know more about this.

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