Bug 94454

Summary: dEQP-GLES3.functional.clipping.point.wide_point_clip* fails
Product: Mesa Reporter: Kenneth Graunke <kenneth>
Component: Drivers/DRI/i965Assignee: Ian Romanick <idr>
Status: RESOLVED FIXED QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: normal    
Priority: medium    
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Bug Depends on:    
Bug Blocks: 94448    

Description Kenneth Graunke 2016-03-09 01:14:36 UTC 
The following dEQP tests all fail:

dEQP-GLES2.functional.clipping.point.wide_point_clip

dEQP-GLES3.functional.clipping.point.wide_point_clip
dEQP-GLES3.functional.clipping.point.wide_point_clip_viewport_center
dEQP-GLES3.functional.clipping.point.wide_point_clip_viewport_corner

It looks like extra points are being rendered that should have been clipped away.
Comment 1 Kenneth Graunke 2016-03-09 09:53:38 UTC 
I had the result and reference images backwards.  Points that should be rendered, near the very edge, are being clipped away.

Disabling "Viewport XY Clip Test Enable" (GEN6_CLIP_TEST_XY) in 3DSTATE_CLIP makes these tests pass.
Comment 2 Kenneth Graunke 2016-03-11 00:20:11 UTC 
I have a 5 patch series which fixes these bugs.  I'll send it to the list as soon as it passes regression testing.
Comment 3 Kenneth Graunke 2016-03-11 01:36:33 UTC 
Starting at:
https://lists.freedesktop.org/archives/mesa-dev/2016-March/109702.html
Comment 4 Kenneth Graunke 2016-03-19 06:54:34 UTC 
Fixed in master with:

commit 88d28aa4d9edec33ef7bcf1f56b77fbb756a24f8
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Thu Mar 10 14:36:25 2016 -0800

    i965: Stop XY clipping point and line primitives.

commit 0de64ab7881cc4d343fecf8a2b5b9b9ca7b34416
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Thu Mar 10 15:30:36 2016 -0800

    i965: Scissor to the viewport when rendering points/lines.

commit d000a4989f66921832a33742ea07fa191393231b
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Thu Mar 10 16:04:01 2016 -0800

    i965: Include the viewport in the scissor rectangle.

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