Bug 93054

Summary: [BDW] DiRT Showdown and Bioshock Infinite only render half the screen (bottom left triangle)
Product: Mesa Reporter: Kenneth Graunke <kenneth>
Component: Drivers/DRI/i965Assignee: Kenneth Graunke <kenneth>
Status: VERIFIED FIXED QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: normal    
Priority: medium CC: eero.t.tamminen
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Bug Depends on:    
Bug Blocks: 93185    

Description Kenneth Graunke 2015-11-21 09:55:31 UTC 
DiRT Showdown and Bioshock Infinite both only render half of the screen - only the lower left of the two triangles.   This happens right away, even at the splash screen.

export MESA_GL_VERSION_OVERRIDE=4.1
export MESA_GLSL_VERSION_OVERRIDE=410

The scalar VS backend appears to be at fault, because INTEL_DEBUG=vec4 fixes it.
Comment 1 Kenneth Graunke 2016-05-08 01:37:50 UTC 
Patch on list:
https://lists.freedesktop.org/archives/mesa-dev/2016-May/115859.html
Comment 2 Ilia Mirkin 2016-05-08 15:42:15 UTC 
You probably meant https://patchwork.freedesktop.org/patch/86011/
Comment 3 Kenneth Graunke 2016-05-08 20:38:27 UTC 
Heh, whoops.  Yes, that one :)
Comment 4 Kenneth Graunke 2016-05-09 22:32:15 UTC 
Fixed by

commit e0e7280db0b03b08479ef9db681db186f80605e5
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Sat May 7 17:30:02 2016 -0700

    i965: Clamp "Maximum VP Index" to 1 when gl_ViewportIndex isn't written.
Comment 5 Eero Tamminen 2016-05-10 12:07:08 UTC 
Bug manifests with Mesa 11.2 (e.g. one in Ubuntu 16.04), but is gone with the latest Mesa from Git. -> Verified.
Comment 6 Eero Tamminen 2016-05-10 12:14:00 UTC 
(Although title mentions BDW, verification of the issue and its fix were done on SKL.)

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