Implementing RandR support in xf86 video driver

[sid baral]

Dear All,
             I am pretty new to X development.
I am trying to implement rotation and reflection of window using RandR in
xf86 video driver for our own chipset. We have our existing xf86 driver but
that does not do anything for rotation or reflection. I studied some
existing drivers(like the RADEON) one to understand how they are doing it
but failed to get the overall idea of how to to do it.

So I need some documents or some guidance which says what all things should
be done in general to do rotation or reflection in xf86 driver. Currently
what I have done is:

1. implemented the shadow buffer related CRTC functions and used the EBI
memory (not the graphics card memory) for this.

2. just with this simple change what I see is some rectangular stipples
getting drawn in new orientation(though it is not full screen)

I know lot of major things to be done but probably I need a list. Can some
one help me with this.


Thank you,
xbaral.
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