These are our reference software rasterizers. They can build everywhere
and are a precious debugging tool.

Making them always present immensily simplifies the scons logic.

If people want to avoid building it is still possible to pass
direcotries and target names to scons to narrow the build.

Now that draw depends on llvm it is very difficult to correctly handle
broken llvm installations. Either the user requests LLVM and it needs to
supply a working installation. Or it doesn't, and it gets no LLVM
accelerate pipe drivers.

Prevents needless recompiles when switching dri=yes to no.

Move it into a separate tool.

TODO: Needs to be "tooled" in each SConscript that uses it.

Only needed for DRI. Should be linked in DRI specific subdirectories.

Provides basic window system integration behind a simple interface,
allowing tests to be written without dependency on either the driver
or window system.

With a lot of work, could turn into something like glut for gallium.

Since the winsys isn't shared with i965 and never will be

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

There are so many state trackers and winsys that rely on it for debug
building, and trace can really build anywhere and is thin so there's no
point is making it an option.

Based on  Xavier Chantry <chantry.xavier@gmail.com>'s patch:

"I also removed the trace check in xlib SConscript which is now useless, and
that script seems to deal with the cell driver, so I added cell in the check
for supported drivers."

The problem with the old way is that passing 'progs/subdir' as argument
would fail.

the llvmpipe tgsi translation is a lot more complete than what was in
gallivm so replacing the latter with the former. this is needed since
the draw llvm paths will use the same code. effectively the proven
llvmpipe code becomes gallivm.

build.

Everybody is using the C99's integer types. Everybody except Microsoft,
which in turns means everybody is including their own definitions of C99
integer types for MSVC, causing duplicate definitions when linking two
projects. This is the case of building Gallium and LLVM with MSVC.

Shipping alternative stdint.h and stdbool.h headers for MSVC allows us
to share a single definition. It also removes clutter from the Gallium
headers.

Cell driver's SConscript never got written, and it is not trivial one to
write, so don't accept cell in the driver option to avoid confusion.

This is a substantial reorganization, This particular commit enables:
- building the progs for unices platforms
- glew is now built as a shared library (it is the default, and it is
inconvenient and pointless to shift away from that default)
- all progs get built by default

This fixes MinGW cross compilation build, recently broken due to the use
of convenience libraries in the GLSL preprocessor.

This is quite messy. GLSL code has to be built twice: one for the
host OS, another for the target OS.

But there are some missing symbols, "nm -u i965_dri.so"
[SNIP]
                 U brw_surface_bo
                 U brw_surface_pitch
                 U brw_texture_blanket_winsys_buffer
                 U brw_texture_get_winsys_buffer
                 U brw_update_dirty_counts
[SNIP]

	None of the other driver have a silly sufix,
	so just drop it. Nothing new added in this commit
	or any other commit but this is better marketing.

The driver never work with real hardware and has
bitrotted for quite some time now, might as well
drop it. If somebody wants to look at it just use git.

scons ... statetrackers=xorg

	This driver does no transformation of the gallium calls
	going to the real driver, like the identity matrix. It is
	intended to be the basis for transforming and/or debug
	drivers like trace and rbug.

	Authors of this patch are:
		Michal Krol, orignal heavy lifting.
		José Fonesca, object wrapping code stolen from trace.
		Jakob Bornecrantz, put it all toghether and renamed a stuff.