[Bug 100650] texelFetch should always perform sRGB decode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100650

            Bug ID: 100650
           Summary: texelFetch should always perform sRGB decode
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: kenneth at whitecape.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org
            Blocks: 94448

The i965 driver fails the following dEQP test on all platforms:

dEQP-GLES31.functional.srgb_texture_decode.skip_decode.srgba8.texel_fetch

This is because it respects GL_SKIP_DECODE_EXT for all texturing functions,
when it's required to ignore it for texelFetch*().  From the
EXT_texture_sRGB_decode spec:

   "The conversion of sRGB color space components to linear color space is
    always performed if the texel lookup function is one of the texelFetch
    builtin functions.

    Otherwise, if the texel lookup function is one of the texture builtin
    functions or one of the texture gather functions, the conversion of sRGB
    color space components to linear color space is controlled by the
    TEXTURE_SRGB_DECODE_EXT parameter.

    If the TEXTURE_SRGB_DECODE_EXT parameter is DECODE_EXT, the conversion
    of sRGB color space components to linear color space is performed.

    If the TEXTURE_SRGB_DECODE_EXT parameter is SKIP_DECODE_EXT, the value
    is returned without decoding. However, if the texture is also accessed
    with a texelFetch function, then the result of texture builtin functions
    and/or texture gather functions may be returned with decoding or without
    decoding."


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=94448
[Bug 94448] double Everything's Quality, Please! (Fix all the dEQP bugs!)
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