Bug 88115

Summary: Regression: New WebGL conformance test failuers (GLSL Functions) with latest Mesa master
Product: Mesa Reporter: kalyank <kondapallykalyancontribute>
Component: Drivers/DRI/i965Assignee: Ian Romanick <idr>
Status: RESOLVED DUPLICATE QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: normal    
Priority: medium CC: chadversary, lemody, mattst88
Version: git   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description kalyank 2015-01-06 15:39:44 UTC 
I was checking WebGL conformance test results with latest Mesa master and Chromium (using GLES backend). I see that the following tests fail now:

https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-ceil.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-clamp-float.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-clamp-gentype.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-cos.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-floor.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-normalize.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-sign.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-sin.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-step-float.html
https://www.khronos.org/registry/webgl/sdk/tests/conformance/glsl/functions/glsl-function-step-gentype.html

I could track down the regression to this commit:

commit 44573458bdc52acc304fb75d6df502312b8e149c
Author: Matt Turner <mattst88@gmail.com>
Date:   Sat Dec 20 11:50:31 2014 -0800

    i965/vec4: Add pass to gather constants into a vector-float MOV.
    
    Currently only handles consecutive instructions with the same
    destination that collectively write all channels.
    
    total instructions in shared programs: 5879798 -> 5869011 (-0.18%)
    instructions in affected programs:     465236 -> 454449 (-2.32%)
    
    Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

Steps to reproduce the issue:
1) Launch Chrome and force it to use GLES backend(i.e. One can force Chrome to use GLES backend as following: chrome --use-gl=egl).  I am not sure if its necessary to use GLES backend to replicate the above mentioned issues but I haven't tested them with GL backend.
2)Open any of the above mentioned URLS in the browser.
Comment 1 lu hua 2015-01-07 01:40:45 UTC 

*** This bug has been marked as a duplicate of bug 87887 ***

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.