Public bug reported:
Trying to build something on WebGL technology, I noticed that basic
shaders were producing incorrect output. The problem occurs on both
Firefox 4 and Chrome 7. I'm on Intel GM965 hardware, but strangely also
see the exact same problem when I install `libgl1-mesa-swrast` or try
with `LIBGL_ALWAYS_SOFTWARE=1`.
The problem can be reproduced with a fragment shader that simply says:
gl_FragColor = vec4(1.0, 0.9, 0.9, 1.0);
The output will appear in bright red. I've had several people on Windows
and Maverick with nVidia report that they see a pinkish white, as I was
expecting in the first place.
I've uploaded a simple WebGL example here: (I'll try to attach it.)
http://stephan.kochen.nl/shaderbug.html
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: libgl1-mesa-dri 7.9~git20100924-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-23.37-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic x86_64
Architecture: amd64
DRM.card0.LVDS.1:
status: connected
enabled: enabled
dpms: On
modes: 1280x800
edid-base64:
AP///////wAyDAEGAAAAAAARAQOAIRV4CrNAmVlTjSclUFQAAAABAQEBAQEBAQEBAQEBAQEBEhsAiFAgEDAwGDYAS88QAAAZAAAAAAAAAAAAAAAAAAAAAAAAAAAA/gBMR1BoaWxpcHNMQ0QKAAAA/gBMUDE1NFdYNC1UTEE0AOk=
DRM.card0.VGA.1:
status: disconnected
enabled: disabled
dpms: On
modes:
edid-base64:
Date: Tue Nov 16 19:13:06 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MachineType: Hewlett-Packard HP Compaq 6710b (KE121ET#ABH)
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-23-generic
root=UUID=59c16ced-1ace-403d-9b2b-dcc19e7626d4 ro quiet splash
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, user)
LANG=nl_NL.utf8
SHELL=/bin/bash
SourcePackage: mesa
dmi.bios.date: 01/15/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68DDU Ver. F.15
dmi.board.name: 30C0
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.2E
dmi.chassis.asset.tag: CNU8092SDY
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvr68DDUVer.F.15:bd01/15/2009:svnHewlett-Packard:pnHPCompaq6710b(KE121ET#ABH):pvrF.15:rvnHewlett-Packard:rn30C0:rvrKBCVersion71.2E:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Compaq 6710b (KE121ET#ABH)
dmi.product.version: F.15
dmi.sys.vendor: Hewlett-Packard
system:
distro: Ubuntu
codename: maverick
architecture: x86_64
kernel: 2.6.35-23-generic
** Affects: mesa (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug maverick
--
Basic shaders produce incorrect output
https://bugs.launchpad.net/bugs/676183
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