14.04.2011 16:16, Robert Osfield wrote:
The heart of the problem is that the DDS file format doesn't
distiguish between the
two varients of DXT1, there is an alpha bit in the DDS header that
could be used,
but 3rd party tools like nvdxt and nvcompress that write DDS files
don't set this bit
so both DTX1c with black encoded pixels and DTX1a are essentially identical
in terms of header and content.
Where from this information?
$ nvdxt.exe -nomipmap -dxt1a -file test_dxt1.png -output test_dxt1a.dds
Version 8.30
Reading test_dxt1.png [Processing] Writing .\test_dxt1a.dds
$ nvdxt.exe -nomipmap -dxt1c -file test_dxt1.png -output test_dxt1c.dds
Version 8.30
Reading test_dxt1.png [Processing] Writing .\test_dxt1c.dds
$ md5sum.exe test_dxt1*.dds
ac1473f8822abbb2d6006de0021c6bc0 *test_dxt1a.dds
249071d0b0974593b310656acea73e1d *test_dxt1c.dds
Mikhail
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