[Bug 89597] New: Implement SSBOs in GLSL front-end and i965

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89597

            Bug ID: 89597
           Summary: Implement SSBOs in GLSL front-end and i965
           Product: Mesa
           Version: unspecified
          Hardware: Other
               URL: https://www.google.com/webhp?sourceid=chrome-instant&i
                    on=1&espv=2&es_th=1&ie=UTF-8#es_th=1&q=gl%20ssbo
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: krh at bitplanet.net
        QA Contact: intel-3d-bugs at lists.freedesktop.org

We need to add support for SSBOs (link in URL field).  Very brief summary:
SSBOs are GL buffer objects accessed through interface blocks.  In other words,
similar to UBOs, except 1) they're writable, 2) they can hold atomics and 3)
they have an optional dynamically sized array at the end.

Attached patch is a quick prototype that implements parts of the front-end
changes (adding the new 'buffer' keyword) and backend changes to add new
opcodes and implement SSBO loads using the date cache oword read message.

The implementation is not expected to exercise the hardware in new ways, we
already oword reads and writes and atomics. One exception is that for bounds
checking access to the variable length array we could use the resinfo sampler
message.

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