[SNB] SynMark GSCloth test renders wrong
Submitted by Eero Tamminen
Assigned to Intel 3D Bugs Mailing List
Created attachment 135603 Incorrect rendering screenshot
Mesa fails SynMark render validation for OglGSCloth test on SNB: ./synmark2 OglGSCoth
Rendering is obviously incorrect (see the the attachment). Francesco's recent GEN6-7 Transform feedback optimization patch series seems to make this somewhat worse.
I don't know whether Mesa has ever rendered it correctly on SNB, the issue has been there at least a year. Rendering is fine on GEN7+ (also with Francesco's patch series).
Unlike most of the other tests we run regularly (which work fine), GSCloth uses geometry shaders, streamout and transform feedback. GfxBench Manhattan uses also transform feedback, but that at least didn't have obvious rendering issues on SNB like this test.