[Bug 93418] Geometry Shaders output wrong vertices on Sandy Bridge

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93418

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 121075
  --> https://bugs.freedesktop.org/attachment.cgi?id=121075&action=edit
Screenshot from trace

What's not obvious in the previous screenshot is that all these lines stop at
the diagonal. It looks like there's a fan vs strip type of situation going on
here on top of whatever's causing the lines to appear.

The first draw with a GS shows the bad behaviour:

813290 @0 glDrawRangeElementsBaseVertex(mode = GL_POINTS, start = 0, end =
24630, count = 24630, type = GL_UNSIGNED_SHORT, indices = 0x15eb10, basevertex
= 413659)

So it takes points in and outputs a triangle_strip. Perhaps that's where things
are going wrong?

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