[Bug 85376] Dolphin emulator has bad colors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85376

Matthew Woehlke <mw_triad at users.sourceforge.net> changed:

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                 CC|                            |mw_triad at users.sourceforge.
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--- Comment #15 from Matthew Woehlke <mw_triad at users.sourceforge.net> ---
Not sure if this is fixed or not, but I was able to isolate the GLSL where
things go sideways.

This is broken:

    prev.rgb = (prev.rgb * (256 - ifog) + cfogcolor.rgb * ifog) >> 8;

The above apparently should have the same effect as the following, which works
correctly:

    prev.r = (prev.r * (256 - ifog) + cfogcolor.r * ifog) >> 8;
    prev.g = (prev.g * (256 - ifog) + cfogcolor.g * ifog) >> 8;
    prev.b = (prev.b * (256 - ifog) + cfogcolor.b * ifog) >> 8;

So something is going sideways distributing the above operations across vector
components. Seems reasonable to suspect code generation.

I tried splitting just the bitshift step with no effect, so my guess is that at
least multiplying an int3 by an int is doing something wrong.

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