[Bug 102611] [OpenGL CTS] KHR-GL45.transform_feedback.draw_xfb_test fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102611

--- Comment #5 from Kenneth Graunke <kenneth at whitecape.org> ---
Jason and I figured this one out on #intel-3d tonight.

1. We emit the SURFACE_STATE for the renderbuffer.  It has no auxiliary
surface.
2. We fast clear the renderbuffer, which causes a delayed CCS_D buffer
allocation.
3. The next use of the renderbuffer needs a new SURFACE_STATE because it's
gained an auxiliary surface.  In the broken driver, we fail to notice this and
reuse the old SURFACE_STATE.

Not every BLORP operation needs to emit new surface state.  But, when we change
auxiliary state (which usually involves a BLORP operation), we do need to.  I'm
not even sure every change needs to trigger an update, maybe just transitions
to/from AUX_USAGE_NONE...

Jason suggested renaming BRW_NEW_FAST_CLEAR_COLOR to BRW_NEW_AUX_STATE, and
flagging it in more cases.  I think this is a good idea, we'll just need to
figure out which spots need to trigger it...

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