st/dri: Allow creating OpenGL 3.3 core contexts

Enables OpenGL 3.3 piglit tests.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
r600g: Removed unnecessary positivity check for unsigned int variable.

Signed-off-by: Marek Olšák <marek.olsak@amd.com>
mesa: Add warning to _REV pack/unpack functions with incorrect behavior

Signed-off-by: Mark Mueller <MarkKMueller@gmail.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
dri3: Track full 64-bit SBC numbers, instead of just 32-bits

Tracking the full 64-bit SBC values makes it clearer how those values are
being used, and simplifies the wait_msc code. The only trick is in
re-constructing the full 64-bit value from Present's 32-bit serial number
that we use to pass the SBC value from request to event.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
dri3: Fix dri3_wait_for_sbc to wait for completion of requested SBC

Eric figured out that glXWaitForSbcOML wanted to block until the requested
SBC had been completed, which means to wait until the
PresentCompleteNotify event for that SBC had been received.

This replaces the simple sleep(1) loop (which was bogus) with a loop that
just checks to see if we've seen the specified SBC value come back in a
PresentCompleteNotify event yet.

The change is a bit larger than that as I've broken out a piece of common
code to wait for and process a single Present event for the target
drawable.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
dri3: Enable GLX_INTEL_swap_event

Now that we're tracking SBC values correctly, and the X server has the
ability to send the GLX swap events from a PresentPixmap request, enable
this extension.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
dri3: Flush XCB before blocking for special events

XCB doesn't flush the output buffer automatically, so we have to call
xcb_flush ourselves before waiting.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
dri3, i915, i965: Add __DRI_IMAGE_FOURCC_SARGB8888

The __DRIimage createImageFromFds function takes a fourcc code, but there was
no fourcc code that match __DRI_IMAGE_FORMAT_SARGB8. This adds a define for
that format, adds a translation in DRI3 from __DRI_IMAGE_FORMAT_SARGB8 to
__DRI_IMAGE_FOURCC_SARGB8888 and then adds translations *back* to
__IMAGE_FORMAT_SARGB8 in both the i915 and i965 drivers.

I'll refrain from comments on whether I think having two separate sets of
format defines in dri_interface.h is a good idea or not...

Fixes piglit glx-tfp and glx-visuals-depth

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
dri3: Track current Present swap mode and adjust buffer counts

This automatically adjusts the number of buffers that we want based on
what swapping mode the X server is using and the current swap interval:

        swap mode       interval        buffers
        copy            > 0             1
        copy            0               2
        flip            > 0             2
        flip            0               3

Note that flip with swap interval 0 is currently limited to twice the
underlying refresh rate because of how the kernel manages flipping. Moving
from 3 to 4 buffers would help, but that seems ridiculous.

v2: Just update num_back at the point that the values that change num_back
    change.  This means we'll have the updated value at the point that the
    freeing of old going-to-be-unused backbuffers happens, which might not
    have been the case before (change by anholt, acked by keithp).

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>