Finally we can inject layers for debug, trace and "other" with
relative ease between state-tracker and driver.

Several software rasterizers can make use of this winsys, but there
isn't any reason why the winsys itself should know about them.

This change moves that information into the libgl-xlib target.

Need to fix up other targets making use of this winsys.

The driver is pretty much totally broken though.

This will likely change. Most probably we'll just add an alias to indvidual
targets and use the regular scons targets arguments.

Don't make the shared software winsys rely on internal knowledge about
the cell driver's texture twiddling.

This is just a sketch and hasn't even been compile tested.

No need for the user of this winsys to supply/manage the x11 gc for
us.

Conflicts:
	src/gallium/drivers/llvmpipe/lp_setup.c
	src/gallium/drivers/softpipe/sp_texture.c
	src/gallium/drivers/softpipe/sp_winsys.h
	src/gallium/state_trackers/egl/common/egl_g3d.c
	src/gallium/state_trackers/egl/x11/native_x11.c
	src/gallium/state_trackers/egl/x11/native_x11.h
	src/gallium/state_trackers/egl/x11/native_ximage.c

commit f90b3f01af82b9522067b1824e21709a6fb2d3af
Author: Keith Whitwell <keithw@vmware.com>
Date:   Mon Mar 8 14:39:44 2010 +0000

    gallium: remove p_screen::surface_buffer_create

    This isn't very useful without texture_blanket(), which has also been
    removed.

    Note that this function hasn't been removed from the old pipe_winsys
    (u_simple_screen) still used internally by some drivers (eg softpipe).

commit 6c462de39a4b9980a5f034a95e580efdfcb8173b
Author: Keith Whitwell <keithw@vmware.com>
Date:   Mon Mar 8 14:27:40 2010 +0000

    egl/x11: disable texture_blanket usage

commit b42da9160df9f47224e5b3291b972f41767aa6e5
Merge: 4be2436 3ca93362
Author: Keith Whitwell <keithw@vmware.com>
Date:   Mon Mar 8 14:27:24 2010 +0000

    Merge commit 'origin/master' into gallium-no-texture-blanket

    Conflicts:
    	src/gallium/drivers/svga/svga_screen_texture.c

commit 4be2436316929e3dfc55bc34d810920c06556b66
Author: Keith Whitwell <keithw@vmware.com>
Date:   Thu Mar 4 14:59:26 2010 +0000

    gallium: remove texture blanket call

    No longer needed, except for nouveau and egl/xll/native_ximage.c.

    Fix for nouveau is to keep the call, but move it to an internal
    function within nouveau.

    Fix for that egl/x11 relies on gallium-sw-api branch or its successor.

commit 69b6764330367d63c237d0bde9fb96435d0e0257
Author: Keith Whitwell <keithw@vmware.com>
Date:   Thu Mar 4 13:35:16 2010 +0000

    drm_api: wrap comment

The first part of the fix of BGRA vertex colors.

Fixes glean/clipFlat for r300g.

Change the texture data_ptr from just a single image pointer to an
array of image pointers, indexed by mipmap level.
We'll use this for mipmap filtering.
For now, the mipmap level is hard-coded to zero.

The code was walking over the regs of pairs of attributes and checking
whether the attribute with a given reg index had point sprite enabled.
So the point sprite setup code was rarely even getting executed.
Instead, we need to determine which channels of a reg need point
sprite coordinate replacement.  In addition, it was multiplying the
attribute by 1/w, when it's supposed to cover (0, 1) in each direction
regardless of w, and it wasn't filling in the Z and W components of
the texcoord as specified.

Fixes piglit point-sprite and the spriteblast demo.  Bug #24431, #22245.

Use the divisor/remainder for the WaitForMscOML call if a wait_interval
is passed.  Allows for testing of the WaitMSC paths in the server & DDX.

Just use flush_frontbuffer directly.  The flush_frontbuffer routine has
been somewhat devalued recently, but it is actually just the right
interface for our needs.

It is in pipe_screen, meaning that any wrapping (eg trace module)
will get properly unwrapped before we try and use the pipe_surface
argument for real.

If a particular co-state-tracker needs to implement this itself, it
should organize a way to allow the winsys to call back up to its
level, rather than hijacking the driver-supplied implementation.