[Dri-devel] Want to help enable DRI on multiple-head cfg's

[Andreakis, D. (MED) <Dea...@me...>]

I would like to help enable DRI for multiple head configurations but I
need a little direction to get started. I understand from previous
postings and comments I have seen in the source that DRI is currently
disabled in multiple head cfg's because of "sync. problems" but I am not
sure of the exact technical meaning of this. 

My development platform is an iBook w/ an ATI Radeon Mobility 7500,
Debian (sid)(2.4.19 kernel), XFree86 v4.3.0 and Michael Danzer's DRI
trunk. I did some initial work on the 2D radeon driver to enable dual
independent heads and this works ok for now. I then backed-off to just
the internal panel and using Michael's DRI trunk got DRI enabled. Now I
would like to take the last step and get DRI going w/ this dual
independent head configuration. 

I am not sure what modules to start looking at for this effort...i.e.
are the changes required in the XFree86 3D drivers in
xc/lib/GL/mesa/src/drv/radeon/ and/or in the kernel-mode drm modules in
xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/. Also, some
direction from a design standpoint and hints/tips on where to look would
be useful.

-dean andreakis