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dmsovetov / nvidia-texture-tools

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DXT1a support #1

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
Support for DXT1a has been requested by many developers. It should be easy to 
add by using the 
weighted compressor. Need CUDA implementation of weighted cluster fit 
compressor.

Original issue reported on code.google.com by cast...@gmail.com on 17 Apr 2007 at 9:00

GoogleCodeExporter commented 8 years ago 
I need the DXT1a support to.
(It works with older NVidia compression lib)

Original comment by kacem.be...@gmail.com on 22 Jun 2007 at 3:11

GoogleCodeExporter commented 8 years ago 
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.

Original comment by ae.pas...@gmail.com on 25 Jul 2007 at 12:59

Attachments:

GoogleCodeExporter commented 8 years ago 
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.

Original comment by cast...@gmail.com on 25 Jul 2007 at 1:11

GoogleCodeExporter commented 8 years ago 
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!

Original comment by ae.pas...@gmail.com on 25 Jul 2007 at 5:22

GoogleCodeExporter commented 8 years ago 
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!

Original comment by brdms...@gmail.com on 1 Aug 2007 at 10:14

GoogleCodeExporter commented 8 years ago 
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.

Original comment by cast...@gmail.com on 1 Aug 2007 at 10:23

GoogleCodeExporter commented 8 years ago 
bump!  :)

Any news on this?

Thanks!

Ben

Original comment by brdms...@gmail.com on 11 Sep 2007 at 9:28

GoogleCodeExporter commented 8 years ago 
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}).

Original comment by cast...@gmail.com on 11 Sep 2007 at 10:13

GoogleCodeExporter commented 8 years ago

Original comment by cast...@gmail.com on 28 Nov 2007 at 3:14

GoogleCodeExporter commented 8 years ago 
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

Original comment by brdms...@gmail.com on 14 Dec 2007 at 2:30

GoogleCodeExporter commented 8 years ago 
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.

Original comment by cast...@gmail.com on 14 Dec 2007 at 2:45

GoogleCodeExporter commented 8 years ago 
OK, DXT1a is supported now. The CUDA accelerated compressor will be added later,
possibly after the beta.

Original comment by cast...@gmail.com on 4 Feb 2008 at 7:55

GoogleCodeExporter commented 8 years ago 
I've opened Issue 29 to trace progress of the CUDA accelerated DXT1a compressor.

Original comment by cast...@gmail.com on 4 Feb 2008 at 8:03