i915g: Fix the sampler bind function

The new sampler bind sends us NULL samplers, so we need to count
the number of valid samplers ourselves. This fixes ~500 piglit
regressions from the sampler rework.

While we're at it, let's also support start.
i915g: Rename sampler to fragment_sampler

Otherwise it is fairly confusing.
st/mesa: improve format selection for GLES

Reviewed-by: Wladimir J. van der Laan <laanwj@gmail.com>
configure.ac: report an error if LLVM shared libs are disabled and CL is enabled

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
gallium/radeon: don't export any private symbols

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
gallium/swrast: don't export any private symbols

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
st/dri: don't export any private symbols

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
glx: Hide xGLXMakeCurrentReply inside SendMakeCurrentRequest

Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
glx: Propagate failures from SendMakeCurrentRequest where possible

Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
glx: Generate fewer errors in MakeContextCurrent

For a few reasons.

1: In the (current) common case, these conditionals are never true. All
we're doing by checking them is slowing down MakeCurrent.  The server
does these checks already anyway.

2: GLX >= 3.0 contexts may legally be made current without a bound
framebuffer.

This does not fix piglit/glx-create-context-current-no-framebuffer, but
is a prerequisite for fixing it.

Cc: "9.1 9.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
glsl: Keep track of location for interface block fields.

This patch adds a "location" element to struct glsl_struct_field, so
that we can keep track of the gl_varying_slot associated with each
built-in geometry shader input.

In lower_named_interface_blocks, we use this value to populate the
"location" field in the ir_variable that stores each geometry shader
input.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
glsl/gs: add gl_in support to builtin_variables.cpp.

Previously, builtin_variables.cpp was written assuming that we
supported ARB_geometry_shader4 style geometry shader inputs, meaning
that each built-in varying input to a geometry was supplied via an
array variable whose name ended in "In", e.g. gl_PositionIn or
gl_PointSizeIn.

However, in GLSL 1.50 style geometry shaders, things work
differently--built-in inputs are supplied to geometry shaders via a
built-in interface block called gl_in, which contains all the built-in
inputs using their usual names (e.g. the gl_Position input is supplied
to the geometry shader as gl_in[i].gl_Position).

This patch adds the necessary logic to builtin_variables.cpp to create
the gl_in interface block and populate it accordingly for geometry
shader inputs.  The old ARB_geometry_shader4 style varyings are
removed, though they can easily be added back in the future if we
decide to support ARB_geometry_shader4.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
glsl/gs: handle gl_ClipDistance geometry input in lower_clip_distance.

This corresponds to the lowering of gl_ClipDistance to
gl_ClipDistanceMESA for vertex and geometry shader outputs.  Since
this lowering pass occurs after lower_named_interface blocks, it deals
with 2D arrays (gl_ClipDistance[vertex][clip_plane]) rather than 1D
arrays in an interface block
(gl_in[vertex].gl_ClipDistance[clip_plane]).

v2 (Paul Berry <stereotype441@gmail.com>): Fix indexing order for
gl_ClipDistance input lowering.  Properly lower bulk assignment of
gl_ClipDistance inputs.  Rework for GLSL 1.50 style geometry shaders.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

v3 (Paul Berry <stereotype441@gmail.com>): Add comments and assertions
to clarify that the 2D version of clip distance is only used for
geometry shader inputs.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
i965/gs: Fixup gl_PointSize on entry to geometry shaders.

gl_PointSize is stored in the w component of VARYING_SLOT_PSIZ, but
the geometry shader infrastructure assumes that it should look for all
geometry shader inputs of type float in the x component.  So when
compiling a geomtery shader that uses a gl_PointSize input, fix it up
during the shader prolog by moving the w component to the x component.

This is similar to how we emit fixups and workarounds for vertex
shader attributes.

Fixes piglit test spec/glsl-1.50/execution/geometry/core-inputs.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
i965: Fix a compiler warning about conservative depth enums.

Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>