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The POSIX function pthread_cond_wait can have spurious wakeups when
waiting on a condition variable.

Add a 64-bit counter that is incremented whenever the barrier becomes
full. A woken thread checks the counter. If the counter has not changed
then it has been spuriously woken and goes back to sleep. If the counter
has changed then it was properly signaled and exits the barrier.

Tested on Mac OS X.

This patch was based on ideas from Luca Barbieri.

I just broke the 2000 fps barrier on glxgears. Yay?

proc_name cannot be NULL after the switch statement. proc_name is
assigned a value or the function has already returned.

and disable batch splitting on these chipsets.

commit 0c572c68 replaced
st_manager_create_api with st_gl_api_create.

Fixes MSVC build.

The struct st_module isn't needed as it is the same thing as the st_api
struct. That is they both represent the API. Instead just use a single
function entry point to the the API.

This allows u_sampler_view_default_dx9_template to do its magic on DX9.

Everybody should respect max_index, specially llvm generated code, which
likes to eat vertices 4 at a time, so it may end up chew a bit a bit more
than actually exists.

Transfer, being now a context operation, should happen in order with
all other contexts operations. If there is rendering pending on the
resource then the driver must flush and potentially wait itself
internally.

Instead of avoiding using transfers internally (as done in llvmpipe) I've
opted to simply pass PIPE_TRANSFER_UNSYNCHRONIZED in all internal
transfers, to avoid infinite recursion.

Recognize PIPE_TRANSFER_UNSYNCHRONIZED and PIPE_TRANSFER_DONTBLOCK.

Array formats without for channels were being advanced as four channels,
causing buffer overflows.

The un-optimized path relies on surface_fill which can only handle formats
with depth <= 32, so it is pointless to keep it around.

It should be just cosmetic.

Unfortunately there are some heavy limitations on supported render target
formats due to the way clear values are used internally.

Irrelevant now that llvmpipe and softpipe grew so far apart.

'llvm' suffix unnecessary now that the C sampling version disappeared.

Add GL/internal/dri_interface.h for __DRI_TEXTURE_FORMAT_RGB.

Avoid hiding existing variable already named info in outer scope.

bo_legacy->tobj cannot be NULL before the call to driUpdateTextureLRU.
There is a NULL check earlier in the routine, and if bo_legacy->tobj is
NULL, memory is allocated.

info cannot be NULL at the call to debug_printf. emit_instruction
dereferences info, so at debug_printf it is either not NULL or the
program has already crashed.