Bug 37018 – 4 WebGL tests fail on my Mac Pro

• Status: RESOLVED
• Resolution: WORKSFORME
• Component: Tools / Tests

[Eric Seidel (no email)]

fast/canvas/webgl/context-attributes-alpha-depth-stencil-antialias.html
fast/canvas/webgl/tex-image-and-sub-image-2d-with-image-data.html
fast/canvas/webgl/viewport-unchanged-upon-resize.html

These seem to pass fine on the commit-queue bot and the Leopard build bot, however on my desktop these fail.  I'm happy to provide you with any hardware profiles you may need.

I'll attach diffs in a sec.

[Eric Seidel (no email)]

Created attachment 52401 [details]
fast/canvas/webgl/context-attributes-alpha-depth-stencil-antialias-diffs.txt

[Eric Seidel (no email)]

Created attachment 52402 [details]
fast/canvas/webgl/tex-image-and-sub-image-2d-with-image-data-diffs.txt

[Eric Seidel (no email)]

Created attachment 52403 [details]
fast/canvas/webgl/viewport-unchanged-upon-resize-diffs.txt

[Zhenyao Mo]

Eric, what graphics card do you have on your mac?

[Zhenyao Mo]

Eric, could you provide your OS and Graphics Card information?  Also, do those failure happen consistently or randomly?

[Eric Seidel (no email)]

These failures happen every time.

[Eric Seidel (no email)]

Created attachment 52838 [details]
abbreviated system profiler report

[Zhenyao Mo]

The cause of the problem might be delay issue for glReadPixels.  Let's see if the readPixels patch might fix this problem (we flush before reading).

https://bugs.webkit.org/show_bug.cgi?id=34718

[Eric Seidel (no email)]

It's actually four tests as of a few days ago.  I ran the tests again just now and all 4 still fail:
  fast/canvas/webgl/context-attributes-alpha-depth-stencil-antialias.html = TEXT
  fast/canvas/webgl/copy-tex-image-and-sub-image-2d.html = TEXT
  fast/canvas/webgl/tex-image-and-sub-image-2d-with-image-data.html = TEXT
  fast/canvas/webgl/viewport-unchanged-upon-resize.html = TEXT

[Zhenyao Mo]

So I guess it's not due to glReadPixels().

[Eric Seidel (no email)]

Running the same tests in Chrome 5.0375.6, fails only
fast/canvas/webgl/context-attributes-alpha-depth-stencil-antialias.html
and only one subtest:

 Testing depth = true
PASS webGL = getWebGL('depthOn', { stencil: false, antialias: false }, [ 0, 0, 0, 1 ], 1, 0) is non-null.
PASS contextAttribs = webGL.getContextAttributes() is non-null.
PASS contextAttribs.depth is true
PASS contextAttribs.alpha is true
PASS contextAttribs.stencil is false
PASS contextAttribs.antialias is false
PASS contextAttribs.premultipliedAlpha is true
FAIL pixel should be 0,0,0,255. Was 0,0,0,0.

[Eric Seidel (no email)]

The number is up to 5 now:
fast/canvas/webgl/context-attributes-alpha-depth-stencil-antialias.htm
fast/canvas/webgl/copy-tex-image-and-sub-image-2d.html
fast/canvas/webgl/point-size.html	expected
fast/canvas/webgl/tex-image-and-sub-image-2d-with-image-data.html
fast/canvas/webgl/viewport-unchanged-upon-resize.htm

[Kenneth Russell]

This issue is holding up the WebKit commit queue. See https://bugs.webkit.org/show_bug.cgi?id=38912 .

[Brent Fulgham]

These tests now pass.