[Bug 93957] [HSW] Mishandling of sample count when using an attachment-less framebuffer (assertion error)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93957

            Bug ID: 93957
           Summary: [HSW] Mishandling of sample count when using an
                    attachment-less framebuffer (assertion error)
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: imirkin at alum.mit.edu
        QA Contact: intel-3d-bugs at lists.freedesktop.org

This manifests in the dEQP test:
dEQP-GLES31.functional.fbo.no_attachments.multisample.samples2

gen6_multisample_state.c:150: gen6_emit_3dstate_multisample: Assertion
`!"Unrecognized num_samples in gen6_emit_3dstate_multisample"' failed.
(gdb) p brw->num_samples
$1 = 2

But of course the minimum number of samples handled is 4. You're allowed to
upgrade this in the driver, just like for glRenderbufferStorageMultisample. See
the ARB_framebuffer_no_attachments spec:

"""
    The number of samples in the
    framebuffer is derived from the value of FRAMEBUFFER_DEFAULT_SAMPLES in an
    implementation-dependent manner similar to that described for the command
    RenderbufferStorageMultisample (section 4.4.2).
"""

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