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RE: [Public WebGL] Demos fail on my system



I noticed this broken non-power-of-two support as well and had to revert to earlier builds. Almost every card I tried it on had the problem (Radeon HD 5870, various nVidia mobile GPUs, etc). Not sure if the extension checking stuff changed and or what.

--
Ben Vanik
Live Labs / Seadragon


-----Original Message-----
From: owner-public_webgl@khronos.org [mailto:owner-public_webgl@khronos.org] On Behalf Of Kenneth Russell
Sent: Tuesday, May 11, 2010 1:09 PM
To: Baffo 32
Cc: public_webgl@khronos.org
Subject: Re: [Public WebGL] Demos fail on my system

On Tue, May 11, 2010 at 11:19 AM, Baffo 32 <baffo32@gmail.com> wrote:
> On Tue, May 11, 2010 at 12:51 PM, Kenneth Russell <kbr@google.com> wrote:
>> On Tue, May 11, 2010 at 4:22 AM, Baffo 32 <baffo32@gmail.com> wrote:
>>> On Mon, May 10, 2010 at 6:29 PM, Gregg Tavares <gman@google.com> wrote:
>>>> This is going to sound like a stupid question so please don't get upset.
>>>>
>>>> I made this mistake once so I just want to double check.
>>>>
>>>> Can you pick Wrench Menu->About Google Chrome and make sure you're 
>>>> actually running 46798?
>>>
>>> I did get a bit version-confused trying to upgrade, but ended up 
>>> uninstalling my previous version and then checking in the wrench 
>>> menu for each new one.  I am indeed running 46847 (verified as you
>>> describe) right now, and the demos are failing.
>>
>> In Chromium, is there a difference in behavior if you use 
>> "--enable-webgl --in-process-webgl" instead of just "--enable-webgl"?
>> Note that the in-process flag is strongly discouraged for general 
>> use, but is still in place for debugging purposes.
>>
>> -Ken
>
> Yes!  Adding "--in-process-webgl" causes all the demos to render.
> However, for each fixed demo, only a rectangle in the lower-left 
> corner is rendered.  See: http://i43.tinypic.com/2dcj09y.png

That's strange. The best explanation I can think of for that behavior is broken non-power-of-two texture support on your graphics card.
Doesn't really explain why things would be working in Firefox, though they may use a different technique to set up the WebGL back buffer.

> Additionally, the first time I open a webgl demo in any given tab now, 
> windows xp quickly attempts to access all attached drives.  This pops 
> up error dialogs because I have unmounted cell phones connected.  The 
> tab displays nothing but white until I close all the dialogs, after 
> which it displays the demo.

I have no idea why that would be happening. I haven't seen it occur on any other machines. The WebGL code doesn't work with any files. Does this happen in the Firefox nightly builds?

-Ken

>>>> If that pans out, can you tell me your graphics card and driver 
>>>> version?  I don't know why that would matter. Just trying to figure 
>>>> out what the issue could be.
>>>
>>> My graphics card is an AGP RADEON X850 with 256 MB memory.  My ati 
>>> drivers are version 6.14.0010.6925 from 9/29/2009 .
>>>
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>>
>

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