Public bug reported:
Graphics: Intel® 965GM
I suspect (I am not a mesa etc. specialist) sth wrong in the mesa lib, because
opengl ES isn't working correctly any more.
I had a WebGL app running nicely in FireFox and Chromium (Ubuntu 12.10).
I upgraded from 12.10(64bits) to 13.4 (64bits).
Now it does not work correctly any more in FireFox as well as Chromium.
No errors, but serious wrong behavior.
It still works correctly on other machines (ubuntu 12.04/FireFox,
macBook/FireFox, windows/Chromium).
The bug turns up in the following lines of the vertex shader (coming from
javascript/WebGL)
-----------
uniform mediump vec3 criticalHeights;
attribute mediump vec3 vertex;
...
if(criticalHeights[2] > vertex.z )
{varAmbientLight = redAmbientLight; varDiffuseLight = redDiffuseLight;};
}
-----------
criticalHeights[2] and vertex.z vary between -100 and + a few hundred.
the 'if' statement always returns true, even with extreme values like
-1000000.0 < vertex.z or criticalHeights[2] > 1000000.0
Please find attached output of glxinfo.
Thanks.
** Affects: mesa (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "glx.txt"
https://bugs.launchpad.net/bugs/1176818/+attachment/3666622/+files/glx.txt
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https://bugs.launchpad.net/bugs/1176818
Title:
upgrade to 13.6: wrong/strange behavior opengel es vertex shader
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