On Wed, Jun 8, 2011 at 10:57 AM, Vangelis Kokkevis <firstname.lastname@example.org
> On Wed, Jun 8, 2011 at 12:24 AM, Mikko Mononen <email@example.com
>> I have been inspecting a bug in our app where Intel HD GPUs will just
>> render a black screen when using Chrome 12 in win7. Firefox seems to
>> blacklist this GPU.
>> The problem is triggered by calling getContext() with 'alpha' attrib
>> set to false (I want opaque composition). In that case the
>> getContext() returns a valid context and sets webgl error to "invalid
>> argument". Any rendering with that context will result a black
>> rectangle on screen. If I set alpha to true, I can see that the
>> rendering is correct, but the composition is of course different too.
> There was an issue we had discovered with some AMD gpus on recent macs that
> had the same symptoms. It looks like what was happening was that even
> though we were asking for an RGB only backbuffer (a texture attached to an
> fbo in our case), the driver was allocating an RGBA buffer and the alpha
> channel values (initialized to 0) would prevent the WebGL content from
> showing up. This was addressed for chrome with a change in the compositor:
> which should be available in the current 13.x+ (Dev channel and Canary)
> releases. You might want to give it another try there.