[Bug 94128] Other multisample "broadcast" blits do not work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94128

            Bug ID: 94128
           Summary: Other multisample "broadcast" blits do not work
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: idr at freedesktop.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org

The glBlitFramebuffer man page says:

    When the color buffer is transferred, values are taken from the read
    buffer of the read framebuffer and written to each of the draw buffers
    of the draw framebuffer.

Commit a6022e54 modified one path through meta to use gl_FragColor to implement
this behavior for multisample-to-singlesample "broadcast" blits where the
destination has multiple enabled color buffers.  This fixed the GLES3
confromance test
framebuffer_blit_functionality_multisampled_to_singlesampled_blit.

Based on inspection of the code (and the commit message for a6022e54),
broadcast blits involving integer (or unsigned integer) color buffers or
multisample-to-multisample blits are still broken.  I am currently working on
patches that will happen to fix the integer cases.

However, we need test cases.  There is one related test case on the GLES3 CTS,
and there are zero related test cases in piglit.  We need to verify the full
cross product of (MS-to-MS, MS-to-SS) x (normalized, integer, unsigned integer,
depth component).

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