nv50/ir: retrieve shadow compare from first arg

This can only happen with texture(samplerCubeShadow, bias), where the
compare will be in the first argument.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: <mesa-stable@lists.freedesktop.org>
nv50/ir: ignore bias for samplerCubeShadow on nv50

Unfortunately there's no good way to do this on the nv50 shader isa.
Dropping the bias seems preferable to doing the compare post-filtering.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: <mesa-stable@lists.freedesktop.org>
nvc0/ir: do quadops on the right texture coordinates for TXD

handleTEX moves the layer as the first argument. This makes sure that
the quadops deal with the texture coordinates.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: <mesa-stable@lists.freedesktop.org>
nvc0/ir: use manual TXD when offsets are involved

Something about how we're implementing offsets for TXD is wrong, just
flip to the generic quadop-based implementation in that case.

This is the minimal fix appropriate for backporting.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: <mesa-stable@lists.freedesktop.org>
nvc0/ir: fill offset in properly for TXD

Apparently TXD wants its offset differently than TEX, accepting it in
the upper bits of the layer index. Unclear what happens when this is
combined with indirect sampler indexing.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
mesa: protect the debug state with a mutex

We are about to change mesa to spawn threads for deferred glCompileShader and
glLinkProgram, and we need to make sure those threads can send compiler
warnings/errors to the debug output safely.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
glsl: rename strtod.c to strtod.cpp

We want to add a static object to initialize locale_t in the following commit.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
glsl: initialize locale_t with a static object

The compiler may be used by multiple contexts simultaneously and needs to be
thread-safe.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
glsl: protect anonymous struct id with a mutex

There may be two contexts compiling shaders at the same time, and we want the
anonymous struct id to be globally unique.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
glsl: protect glsl_type with a mutex

glsl_type has several static hash tables and a static ralloc context.  They
need to be protected by a mutex as they are not thread-safe.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
glsl: add a generic thread pool data structure

It can be used to implement, for example, threaded glCompileShader and
glLinkProgram.

v2: allow tasks to "complete" other tasks

Signed-off-by: Chia-I Wu <olv@lunarg.com>
glsl: add a singleton GLSL thread pool

This thread pool will be used by contexts to queue compilation tasks.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
mesa: add infrastructure for threaded shader compilation

Add _mesa_enable_glsl_threadpool to enable the thread pool for a context, and
add ctx->Const.DeferCompileShader and ctx->Const.DeferLinkProgram to
fine-control what gets threaded.

Setting DeferCompileShader to true will make _mesa_glsl_compile_shader be
executed in a worker thread.  The function is thread-safe so there is no
restriction on DeferCompileShader.

Setting DeferLinkProgram to true will make _mesa_glsl_link_shader be executed
in a worker thread.  The function is thread-safe only when certain driver
functions (as documented in struct gl_constants) are thread-safe.  It is
drivers' responsibility to fix those driver functions before setting
DeferLinkProgram.

When DeferLinkProgram is set, drivers are not supposed to inspect the context
in their LinkShader callbacks.  Instead, NotifyLinkShader is added.  Drivers
should inspect the context in NotifyLinkShader and save what they need for
LinkShader in gl_shader_program.

As a final note, most applications will not benefit from threaded shader
compilation because they check GL_COMPILE_STATUS/GL_LINK_STATUS immediately,
giving the worker threads no time to do their jobs.  A possible improvement is
to split LinkShader into two parts: the first part links and error checks
while the second part optimizes and generates the machine code.  With the
split, we can always defer the second part to the thread pool.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
i965: add drirc option multithread_glsl_compiler

Setting it to a non-zero value N will cause shader compilation to be deferred
to a thread pool.  When N is greater than 1, it indicates the maximum number
of threads in the pool.  When N is 1, the number of threads is up to the
driver (two for i965).

Signed-off-by: Chia-I Wu <olv@lunarg.com>
i965: refactor do_vs_prog

Split do_vs_prog into

  brw_vs_init_compile
  brw_vs_do_compile
  brw_vs_upload_compile
  brw_vs_clear_complile

Signed-off-by: Chia-I Wu <olv@lunarg.com>
i965: refactor do_gs_prog

Split do_gs_prog into

  brw_gs_init_compile
  brw_gs_do_compile
  brw_gs_upload_compile
  brw_gs_clear_complile

Signed-off-by: Chia-I Wu <olv@lunarg.com>
i965: refactor do_wm_prog

Split do_wm_prog into

  brw_wm_init_compile
  brw_wm_do_compile
  brw_wm_upload_compile
  brw_wm_clear_complile

Add struct brw_wm_compile to be passed around them.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
i965: enable threaded precompile

Inherit gl_shader_program and add save/restore functions to save precompile
results in the shader programs.  When DeferLinkProgram is set, we will save
the precompile results instead of uploading them immediately because we may be
on a different thread.

A few other modifications are also needed.  brw_shader_program_precompile_key
is introduced and initialized in NofityLinkShader for we cannot inspect the
context during precompiling.

Signed-off-by: Chia-I Wu <olv@lunarg.com>