Dri2 buffer format

Russell Shaw rjshaw at netspace.net.au
Mon Nov 8 16:12:51 PST 2010


Hi,
How should the "format" of a DRI2 buffer be determined?


http://www.x.org/releases/current/doc/dri2proto/dri2proto.txt

DRI2ATTACH_FORMAT { attachment: CARD32
             format:     CARD32 }

     The DRI2ATTACH_FORMAT describes an attachment and the associated
     format.  'attachment' describes the attachment point for the buffer,
     'format' describes an opaque, device-dependent format for the buffer.


xorg-server-1.7.7/hw/xfree86/dri2/dri2ext.c


If it's opaque, how does a user or library know what bytes are red/green/blue
so that you can draw a line in the right colour?



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