[Bug 99228] [G33] ES2-CTS.functional.texture.mipmap.2d.generate.rgba5551 tests fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99228

            Bug ID: 99228
           Summary: [G33]
                    ES2-CTS.functional.texture.mipmap.2d.generate.rgba5551
                    tests fail
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: chadversary at chromium.org
          Reporter: mark.a.janes at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Four related tests regressed on g33 at:

f3739810e337d0f03514b9b967594c8dc010dfa4
mesa/texformat: Handle GL_RGBA + GL_UNSIGNED_SHORT_5_5_5_1

_mesa_choose_tex_format() already handles GL_RGBA +
GL_UNSIGNED_SHORT_1_5_5_5_REV
by converting it to MESA_FORMAT_B5G5R5A1_UNORM. Teach it do the same for
the non-reversed type. Otherwise, the switch's fallthrough converts it
to an 8888 format, which has incompatible precision in the alpha
channel.

Patch 2/2 to fix
dEQP-EGL.functional.image.modify.tex_rgb5_a1_tex_subimage_rgba8
on Intel.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99185

----------------------------------------------------------------
Standard Output

WARNING: Level 1 comparison to bilinear method failed, found 32 invalid pixels.
WARNING: Level 1 comparison to box method failed, found 32 invalid pixels.
ERROR: Level 1 appears to contain 32 completely wrong pixels, failing case!

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