[Bug 59150] [HSW Bisected]Piglit spec/ARB_vertex_type_2_10_10_10_rev/draw-vertices-2101010 fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59150

Kenneth Graunke <kenneth at whitecape.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Kenneth Graunke <kenneth at whitecape.org> ---
Fixed by piglit commit:

commit 35daaa1695ea01eb85bc02f9be9b6ebd1a7113a1
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Mon Dec 25 21:10:16 2017 -0800

    draw-vertices-2101010: Accept either SNORM conversion formula.

    OpenGL defines two equations for converting from signed-normalized
    to floating point data.  These are:

        f = (2c + 1)/(2^b - 1)                (equation 2.2)
        f = max{c/2^(b-1) - 1), -1.0}         (equation 2.3)

    ARB_vertex_type_2_10_10_10_rev specifies equation 2.2 is to be used.

    However, OpenGL 4.2 switched to use equation 2.3 in all scenarios.
    This matched an earlier OpenGL ES 3.0 decision to only have one formula,
    as well as a DirectX decision to change to equation 2.3.  Some hardware
    also only supports equation 2.3.  So, basically no one can rely on
    equation 2.2 happening, and some people do rely on 2.3.

    This patch continues to require equation 2.3 for GL 4.2+, but relaxes
    the test to allow either behavior for earlier GL versions.

    See the following discussion for more details:
    https://lists.freedesktop.org/archives/mesa-dev/2013-August/042680.html

    This makes this test pass on i965 with Haswell and later.

    Reviewed-by: Roland Scheidegger <sroland at vmware.com>

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