sna: Add zaphod support

Zaphod support is a rudimentary method for creating an Xserver with
multiple screens from a single device. The Device is instantiated, with
a duplication of its resources, as many as required up to a maximum of
the number of its outputs, and each instance is attached to a Screen
and added to the ServerLayout. A Device can be bound to a selection of
outputs using a comma separated list of RandR names.

Note: in general, this is not the preferred solution! And will be
superseded by per-crtc-pixmaps in RandR-1.4.

For example, the following xorg.conf fragment creates an XServer with
two screens, one attached to the LVDS panel on the laptop, and the other
to any external output:

Section "Device"
	Identifier "Intel0"
	Driver     "intel"
	BusID	   "PCI:0:2:0"
	Option     "ZaphodHeads" "LVDS1"
	Screen     0
EndSection

Section "Device"
	Identifier "Intel1"
	Driver     "intel"
	BusID	   "PCI:0:2:0"
	Option     "ZaphodHeads" "DVI1,VGA1"
	Screen     1
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Intel0"
EndSection

Section "Screen"
	Identifier "Screen1"
	Device     "Intel1"
EndSection

Section "ServerLayout"
	Identifier "default"
	Screen     "Screen0"
	Screen     "Screen1"
EndSection

Based on a patch by Ben Skegs <bskeggs@redhat.com>

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/sna/sna_module.h b/src/sna/sna_module.h
index 9b14acc3..97d5dd5e 100644
--- a/src/sna/sna_module.h
+++ b/src/sna/sna_module.h
@@ -1,3 +1,3 @@
 const OptionInfoRec *sna_available_options(int chipid, int busid);
-void sna_init_scrn(ScrnInfoPtr scrn);
+void sna_init_scrn(ScrnInfoPtr scrn, int entity_num);