DXT1a support about nvidia-texture-tools HOT 13 CLOSED

I need the DXT1a support to.
(It works with older NVidia compression lib)

Here is a patch that enables DXT1a fast compression. I tried using the weighted 
alpha
option for squish, however, it didn't work properly for me because it doesn't 
allow
zero weights. Let me know what you think.

That looks pretty good. Thanks!

I'd improve 'compressBlock_BoundsRangeAlpha' to only use the 3 color mode when 
the
given block has any transparent texel. So, when it's entirely opaque, I'd still 
use
the 4 color mode, that in general produces better results.

In squish the approach should be similar, force the 3 color mode when 
transparent
texels are present in the current block. Rather than setting the weights to 
zero, you
could set them to 1, so that they still influence the result, but not in a
significant way.

Good point. I guess I was treating all blocks the same when blocks can alternate
between the 3 color and 4 color modes. I'll take a look at it again when I get a
chance. Thanks!

I'd like to third(4th) the dxt1a support request.  CUDA support would be ideal, 
but 
just getting a fully supported version in there soon would be quite useful.  
Thanks!

I'm working on this right now. In a couple of days I'll submit a fast compressor
based on aa.pascal's contribution and some improvements that I've done. I'll 
finish
the high quality compressor and CUDA's implementation during the next two weeks.

bump!  :)

Any news on this?

Thanks!

Ben

I've added an improved DXT1a fast compressor. I still don't have the high 
quality
compressor, but the improved fast compressor is much better than the old one,
although there's still room for improvement. Please, checkout the code in the
subversion repository and let me know what do you think.

I'll resume the work in the high quality compressor as soon as I finish 
refactoring
the fast compressors (you can find the new code in QuickCompress.{h,cpp}).

Just checking in again - we're basically at the stage where we'd like to fully 
integrate a CUDA compression solution, but high quality DXT1a is important for 
us to 
continue.  If I understand the current state of things, I can get high quality 
images for everything but DXT1a.  For DXT1a, I would have to disable CUDA to 
get 
high quality images - is this correct?  Thanks!!

Ben

brdmster, there's a small amount of work needed to enable high quality DXT1a
compression in the CPU. For GPU compression there's a bit more work required. 
So,
right now, only the quick DXT1a compressor is available.

The DXT1a format will be fully supported for the next beta, that will be 
released
early next year.  I'll keep you posted as soon as I make more progress.

OK, DXT1a is supported now. The CUDA accelerated compressor will be added later,
possibly after the beta.

I've opened Issue 29 to trace progress of the CUDA accelerated DXT1a compressor.