[osg-users] INVALID_OPERATION with compressed textures with mipmaps in OSG 3.4.0

[Trajce Nikolov NICK]

Scott, your fixes did not fix the issues on the OSX with the DDS textures
... But thanks anyway

On Thu, Sep 24, 2015 at 9:26 PM, Robert Osfield <robert.osfield at gmail.com>
wrote:

> Hi Scott,
>
> Thanks for the follow up.
>
> Could you post the whole modified file, this way we can avoid any possible
> copy and past errors.
>
> Thanks,
> Robert.
>
> On 24 September 2015 at 20:13, Davis, Timothy S CTR comnavairsyscom <
> timothy.s.davis.ctr at navy.mil> wrote:
>
>> Sorry.  It keeps trying to encrypt the message.
>>
>> Robert
>>
>> While continuing to build a model that results in the problem, I
>> discovered something I didn't see before.  The IVE model had an incorrect
>> number of mipmap levels (it had 8) for a 32x32 texture.  It makes sense
>> that glTexStorage2D would generate INVALID_OPERATION in this case.
>> Rebuilding the model from a source with uncompressed textures and
>> recompressing the textures worked.  The original model was converted with a
>> much older version of OSG, pre OSG 3 for sure.
>>
>> So I was barking up the wrong tree:)
>>
>> That addresses my specific issue without needing a change to OSG 3.4.0.
>> However, I still think it is worth trying for the OSX case.
>>
>>
>> Trajce
>>
>> In osg/Texture.cpp, function applyTexImage2D(), find the line:
>>
>> useTexStorage &= sizedInternalFormat != 0;
>>
>> add the following after the line:
>>
>> if ( useTexStorage && compressed_image && numMipmapLevels > 2 )
>> {
>>     numMipmapLevels -= 2;
>> }
>>
>> This is clearly not production quality as it assumes block size is 4 and
>> complete mipmaps to 1x1.  It should be enough to check the approach.  You
>> may have to set GL_TEXTURE_MAX_LEVEL if the driver thinks the texture is
>> incomplete, but I didn't have that issue.
>>
>> Scott
>> _______________________________________________
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>> osg-users at lists.openscenegraph.org
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>
>
>
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-- 
trajce nikolov nick
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