llvmpipe: (trivial) use correct LP_MIN_VECTOR_ALIGN define for alignment.

Currently it's the same value.

Reviewed-by: Brian Paul <brianp@vmware.com>
gallium/util: use ui[4] instead of ui in union util_color

util_color often merely represents a collection of bytes, however it is
inconvenient if those bytes can only be accessed as floats/doubles for int
formats exceeding 32bits.
(Note that since rgba8 formats use one uint, not 4 bytes, hence the byte and
short member were left as is.)
llvmpipe: fix clearing of individual color buffers in a fb

GL (3.0) allows you to clear individual color buffers in a fb. In fact
for fbs containing both int and float/normalized color buffers this is
required (because the clearing values are otherwise undefined if applied
to all buffers). The gallium interface was changed a while ago, but llvmpipe
ignored it (hence doing such individual clears always resulted in clearing
all buffers, plus some assorted asserts due to the mixed fbs).
So change the clear command to indicate the buffer to be cleared. Also, because
indicating the buffer to be cleared would have made lp_rast_arg_cmd larger
which is unacceptable (we're trying to shrink it some day) allocate the clear
value in the scene and just pass a pointer.
There's several advantages and disadvantages here:
+ clearing individual buffers works (we could also actually bin such clears now
if they'd come through clear_render_target() if the surface is in the current
fb, though we didn't do this before for the single rb case and still don't try).
+ since there's one clear per rb, we do the format conversion in setup rather
than per bin. Aside from the (drop in the ocean...) performance advantage this
means that clearing to very small values (that is, denormal when converted to
the format) should work for small float (fp16 etc.) formats, as the util code
couldn't handle it correctly before (because cpu denorms are disabled when
executing the bin commands, screwing up the magic conversion and flushing
the values to 0, though this was not verified).
- there's some overhead for traditional old-style clear-all MRT cases, since
there's one rast clear command per rb instead of one for all rbs.

This fixes https://bugs.freedesktop.org/show_bug.cgi?id=76976.

v2: get rid of the ugly manual memcpy stuff and just use union util_color.
This is 32 bytes instead of 16 but as the allocation is per scene we can live
with those additional 16 bytes (and the additional 128 bytes in the setup
context), which makes the code much more obvious. Suggested by Brian.

Reviewed-by: Brian Paul <brianp@vmware.com>
pipe-loader: conditionally build and use pipe_loader_sw_probe_dri

The function relies on the sw/dri winsys which is build only when --enable-dri
is set. Fixes build issues with the following config

 ./configure --disable-dri --with-gallium-drivers=svga --enable-xa

Issue can be reproduced with any hw gallium driver + st that uses the pipe-loader.

Cc: Brian Paul <brianp@vmware.com>
Reported-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
automake: cleanup pipe-loader handling when using sw/xlib winsys

Rather than defining our own set of variables, use NEED_WINSYS_XLIB
and based on it include the sw/xlib winsys.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
gallium/tests: conditionally include sw/dri winsys

In all fairness we allow the gallium tests to be build with --disable-dri
which will result in the approapriate winsys to not be build, thus the
build will fail.

  ./configure --disable-dri --with-gallium-drivers=svga --enable-gallium-tests

Cc: Brian Paul <brianp@vmware.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
gbm/dri: Fix out-of-memory error path in dri_device_create()

Cc: "10.0" "10.1" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
gbm: Set errno on errors

This should give the caller some information of what called the error.
For the gbm_bo_import() case, for instance, it is possible to know if
the import is not supported or the error was caused by an invalid
parameter.

Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
wayland: Fix the logic in disabling the prime capability

It looks like this bit of code is trying to disable the prime capability if
the driver doesn't support createImageFromFds. However the logic looks a bit
broken and what it would actually do is disable all other capabilities apart
from prime. This patch fixes it to actually disable prime.

Cc: "10.0" "10.1" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
egl: Protect use of gbm_dri with ifdef HAVE_DRM_PLATFORM

Otherwise it fails to compile if the drm egl platform is disabled.

Cc: "10.0" "10.1" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>