3DC format test failures

[Stefan Dösinger]

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Hi Matteo,

I'm getting test failures in test_3dc_formats on various machines. Do
you have any idea how to change the test without reducing its
usefulness? It seems that we're seeing all possible swizzles on Windows.

Geforce 9600, Windows 7:
visual.c:16804: Test failed: Expected color 0x003f3f3f or 0x007f0000,
got 0x007f7f7f, case 0.
visual.c:16804: Test failed: Expected color 0x003f3f3f or 0x007f0000,
got 0x007f7f7f, case 1.

Radeon X1600, Windows 7:
visual.c:16804: Test failed: Expected color 0x003f3f3f or 0x007f0000,
got 0x007fffff, case 0.
visual.c:16804: Test failed: Expected color 0x003f3f3f or 0x007f0000,
got 0x007fffff, case 1.

This one smells like an implementation problem: Wine or r300g. Looks
like the draw fails.
visual.c:16804: Test failed: Expected color 0x003f3f3f or 0x007f0000,
got 0x00ff00ff, case 0.
visual.c:16804: Test failed: Expected color 0x003f3f3f or 0x007f0000,
got 0x00ff00ff, case 1.

Cheers,
Stefan
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