Chromium is the development version of Chrome , right?  Sort of like
Fedora is to RHEL, right?  So the Chromium support you mention should be
coming to Chrome sooner or later.

>From what I've been able to work out the reason it doesn't yet work in
Chrome but does work in Firefox/Chromium is as follows (please bear in
mind I am not am expert but have simply tried to learn through a bit of
research online).  Although Chrome/Chromium/Firefox use WebGL which is
based on OpenGL ES, I have learned from reading Mozilla bug reports that
there is more than one way to execute a command in an OpenGL program.
There are a variety of ways a browser can ask the drivers to do the
work, via various driver functions.  This seems to consist of a variety
of alternative and fallback functions and paths in the drivers if the
requested function is not implemented in the driver or is not supported
on the hardware.  Some of these fallbacks will be slower than the
originally requested function.  My guess is that Google has only
implemented some these alternatives and fallbacks recently.  Of course
Mesa's radeon drivers (r300g and r600g, particularly the latter which is
for the newer R600 and later cards) could also be improved and extended
to support the functions currently being requested by Chrome.  But this
is only my best guess and I don't have any evidence to support my
hypothesis.  Google could probably tell you and as I said earlier I
would assume that they have already talked to ATI/AMD about this for the
binary fglrx (Catalyst) driver and to the kernel, Mesa and DDX
developers about this for the open-source radeon drivers.

Anyway it seems that support is on it's way.

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https://bugs.launchpad.net/bugs/685321

Title:
  webgl doesn't work with chrome

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