DDS texture load support

[leilei-]

Pros:

• Saves lots and lots of video memory
• Very quick loading
• Modern video cards, usually made after 1999 natively support it
• Smaller overall base data size than TGA+JPG as well as aggressively optimized PNGs

Cons:

• an evil patent prevents authentic legal software decoding. (Darkplaces has its own patent-free decoding method)
• No texture processing (which is okay to compromise since there's already mips made in the dds's anyway...usually.)
• Artifacts occur, like sudden squares being formed around curves and edges. Can be worked around with alternate encoders, like S2TC
• Not implemented everywhere, particularly Free display drivers steer clear of it due to the aforementioned patent issue. (It is ubiquitous on Windows however, mostly from 1999-2000 hardware on)

[leilei-]

S3TC patent has expired so I may make this issue more of a priority now.