what's 32 bpp?
I see that X servers can be set to run at 8,16,24, or 32 BPP. (also 2
and 4 but that's yuck!).
I know that the 8 bpp mode uses a map table to select 256 out of 2**16
or 2**18 colors, assuming that the card has 3 6 bit dac's, one for
each color. In 16 or 15 bit mode the access to the dac's is direct.
5 bits are used for each dac, with the lsb set to 0. In 16 bbp mode
the extra bit is given to the green dac. In 24bpp mode 8 bit dac's
are used, 8*3=24 bits.
What happens in 32bpp?? I do not believe that video dac's are
available wider than 8 bits. If they are, are 3 10 bit dac's used,
with the extra 2 bits thrown away? Or is a 12 bit dac used for the
Or is this only a maping thing, 24 bits are used, and a whole byte is
thrown away, but using 32bits per pixel cleans up the dma access some
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