[email protected] wrote:
If you say, DDS files are not compressed, the DXTn compression doesn't matter, because the algorithms are hardware accelerated? Did this features (being not compressed) pays off even if I write my scene into an IVE-file and load this file later on in another OSG application? I would say no, because PNG and JPG textures will also be stored decompressed, isn't it?
No, all texture files are embedded into the .ive file just as they are on disk. The .ive doesn't store the decompressed version.
DDS files can store compressed image data (DXT format, in particular). What Wojtek was saying is that the DXT format doesn't need to be decompressed when you load it from disk. Instead, the image data is uploaded straight to the graphics card, and the graphics card "decompresses" it in real time during the texturing process. There isn't any performance penalty because the GPU has dedicated hardware to do the decompression.
Okay, than I have to check for example the GIMP plug-in for writing DDS files because my currently used graphic application writes only RGB(A).
I know there are Photoshop plug-ins for .dds. I suspect there is one available for the GIMP as well.
--"J" _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
