[osg-users] Image::isImageTranslucent() failed when using DXT3 dds texture

Ulrich Hertlein u.hertlein at sandbox.de
Tue Sep 16 04:02:37 PDT 2008


Hi Amalric,

amalric alexandre wrote:
> Is it possible to add the
> 
> GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
> 
> format for the moment ?
>  
> I've found at
> http://www.oldunreal.com/editing/s3tc/ARB_texture_compression.pdf
>  
>... 
> DXT3 seems to bee like RGBA, are you ok to add :

DXT3 contains RGBA channels but is compressed so the fix you're suggesting won't work
since there's no way to figure out the value of the alpha channel without decompressing
the DXT3 data.

/ulrich



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