r600g: fix color exports when we have no CBs

We need to export at least one color if the shader writes it,
even when nr_cbufs==0.

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
r600g: enable SB backend by default

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
Reviewed-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
i965/vs: Fix regression on pre-gen6 with no VS uniforms in use.

df06745c5adb524e15d157f976c08f1718f08efa made it so that we didn't
allocate extra uniform space for unused clip planes, which also
incidentally made us not allocate any space at all, which we were relying
on for this no-uniforms case.  Instead of putting the knowledge of this
special HW exception into the thing that normally preallocates prog_data
for us, just allocate it here.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=68766
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
i965: Directly call intel_batchbuffer_flush() after i915 split.

intel_flush() now did nothing except call through (and
intel_batchbuffer_flush() does the no-op check, too!)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
intel: Add a batch flush between front-buffer downsample and X protocol.

This was already happening because blorp happens to flush at the end of
every call, but we have been talking about removing that at some point,
and this would surely get overlooked.

v2 (Kenneth Graunke): Rebase on latest master.  Note that we did remove
   the other flush, and this change actually did get overlooked!

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
intel: Add support for the new flush_with_flags extension.

This gives us more information about why we're flushing that we can
use for handling our throttling.

v2 (Kenneth Graunke): Rebase on latest master, add missing
   FLUSH_VERTICES and FLUSH_CURRENT, which fixes a regression in Glean's
   polygonOffset test.
v3 (anholt): Drop FLUSH_CURRENT -- FLUSH_VERTICES is what we need, which
   is "get any queued prims out of VBO and into the driver", not "update
   ctx->Current so we can read it with the CPU."  Also drop batch->used
   check, which intel_batchbuffer_flush() does anyway.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
intel: Reuse intel_glFlush().

v2 (Kenneth Graunke): Rebase on latest master.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
i965: Make a slight distinction in perf debug for BOs versus miptrees.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
i965: Drop extra flush when calling intel_miptree_map_raw().

The code that got replaced with map_raw didn't do the flush, but now
map_raw() is responsible for it and we don't have to worry about it.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
i965: Add missing state reset at the end of blorp.

These are things that happen to be occurring because of the batch flush at
the start of the blorp op (which exists to prevent batch space or aperture
space overflow), but the intention was for this sequence of state resets at
the end of blorp to be everything necessary for the next draw call.

Found when debugging the next commit, by comparing brw_new_batch() and
intel_batchbuffer_reset() to brw_blorp_exec().

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
i965/gen7: Use the base_level field of the sampler to handle GL's BASE_LEVEL.

This avoids the need to get the inter- and intra-tile offset and adjust
our miptree info based on them.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
i965: Switch gen4-6 to using the sampler's base level for GL BASE_LEVEL.

Thanks to Ken for trawling through my neglected public branches and
finding the bug in this change (inside a megacommit) that made me abandon
this work.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
mesa: Rip out more extension checking from texformat.c.

You should only be flagging the formats as supported if you support them
anyway.

NOTE: This is a candidate for the 9.2 branch. (required for next commit)
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
mesa: Don't choose S3TC for generic compression if we can't compress.

If the app is asking us to do GL_COMPRESSED_RGBA, then the app obviously
doesn't have pre-compressed data to hand us.  So don't choose a storage
format that we won't actually be able to compress and store.

Fixes black screen in warzone2100 when libtxc_dxtn is not present.  Also
66 piglit tests.

NOTE: This is a candidate for the 9.2 branch.
Reported-by: Paul Wise <pabs@debian.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
gallivm: don't use AoS path if min/mag filter are different with multiple lods

Instead of enhancing the AoS path so it can deal with it, just use SoA. Fixing
AoS path wouldn't be all that difficult (use all the same logic as SoA) but
considered not worth it for now.

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
gallivm: (trivial) don't pass sampler_unit variable down to filtering funcs

The only reason this was needed was because the fetch texel function had to
get the (dynamic) border color, but this is now done much earlier.

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
softpipe: check if so_target is NULL before accessing it

No idea if this is working right but copied straight from llvmpipe.
(Not only does this check the so_target but also use buffer->data instead
of buffer for the mapping.)
Just trying to get rid of a segfault testing something else...

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Reviewed-by: Zack Rusin <zackr@vmware.com>
softpipe: handle NULL sampler views for texture sampling / queries

Instead of crashing just return all zero.

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Reviewed-by: Zack Rusin <zackr@vmware.com>
gallivm: handle unbound textures in texture sampling / texture queries

Turns out we don't need to do much extra work for detecting this case,
since we are guaranteed to get a empty static texture state in this case,
hence just rely on format being 0 and return all zero then.
Previously needed dummy textures (would just have crashed on format being 0
otherwise) which cannot return the correct result for size queries and when
sampling textures with wrap modes using border.
As a bonus should hugely increase performance when sampling unbound textures -
too bad it isn't a useful feature :-).

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Reviewed-by: Zack Rusin <zackr@vmware.com>
draw: fix PIPE_MAX_SAMPLER/PIPE_MAX_SHADER_SAMPLER_VIEWS issues

pstipple/aaline stages used PIPE_MAX_SAMPLER instead of
PIPE_MAX_SHADER_SAMPLER_VIEWS when dealing with sampler views.
Now these stages can't actually handle sampler_unit != texture_unit anyway
(they cannot work with d3d10 shaders at all due to using tex not sample
opcodes as "mixed mode" shaders are impossible) but this leads to crashes if
a driver just installs these stages and then more than PIPE_MAX_SAMPLER views
are set even if the stages aren't even used.

Reviewed-by: Zack Rusin <zackr@vmware.com>