Re: Compressed textures

Martins D Innus wrote:
> On Fri, 7 Jul 2006, Brian Paul wrote:
> 
>> Martins D Innus wrote:
>>
>>>>>>> Hi,
>>>>>>>      I get a segfault when viewing an OpenSceneGraph model with
>>>>>>> compressed textures through tilesort.  It works fine with 
>>>>>>> uncompressed
>>>>>>> textures.  Stack trace attached.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> I don't see the attachment.
>>>>>>
>>>>>> I just tried a Mesa texture compression test and it seemed to work,
>>>>>> with a little hack.  I had to disable the check for the extension
>>>>>> GL_EXT_texture_compression_s3tc since it's not fully supported in
>>>>>> Chromium.  It works to the extent that you can call
>>>>>> glCompressedTexImage2DARB() with a pre-compressed image.  But 
>>>>>> Chromium
>>>>>> doesn't have the S3TC compression/decompression code needed for some
>>>>>> of other paths.
>>>>>>
>>>>>> -Brian
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Sorry, here's the trace.  The textures are precompressed so looks 
>>>>> like it
>>>>> should work based on what you say above.
>>>>>
>>>>> Doesn't seem like it failing on the extension check, as its actually
>>>>> making the glCompressedTexImage2D call.
>>>>>
>>>>> I don't fully understand the code path, but seems like server_index 
>>>>> is not
>>>>> being set.
>>>>
>>>>
>>>>
>>>> Which version of Chromium are you using?  The line numbers in the
>>>> stack trace don't match current CVS.  You might try the 1.9 release
>>>> candidate at http://chromium.sourceforge.net/beta/
>>>
>>>
>>>
>>> I was using 1.9-rc1.  Tried cvs from today with the same result.  
>>> Trace attached.
>>
>>
>> OK, I reproduced the problem here.  There's two things to try:
>>
>> 1. Disable the assertion.  I think it may be bogus.
>> 2. Increase your MTU in your .conf file so it can hold any compressed 
>> tex image.
> 
> 
> Increasing the MTU (1024*1300) made it not crash, but that caused there 
> to be untextured polygons, as well as textures applied to the incorrect 
> polygons.
> 
> OR
> 
> Disabling the assertion caused problems further along. See attached.

Hmmm.


> Doesn't "server_index=-1" cause "buffer" to be invalid at line 80 of 
> tilesortspu_flush.c ?

server_index is always >= 0 for me.  I checked in some new assertions 
to be sure.  I guess we're hitting slightly different problems.

What's involved in running your OpenSceneGraph program?  Could I get a 
copy?

-Brian

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