Re: [PATCH 2/5] d3d9/tests: Add a test for UpdateTexture.

[Stefan Dösinger]

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Am 2015-03-11 um 12:46 schrieb Matteo Bruni:
> It seems to do the conversion IIRC. Notice though that that table 
> entry is commented out.
- From my little UpdateTexture test on volumes in device.c I had the
impression that UpdateTexture always just behaves like memcpy, that's
why this is confusing me. Maybe my previous mental model of
UpdateTexture / UpdateSurface was right and AMD just does some extra
work. But maybe there is a way to make updates between different
formats do something useful on all GPUs.

There are some other interesting questions though: What happens when
there are different formats with the same pixel size? E.g. ARGB16 ->
ARGB16F, or signed / unsigned? Or maybe R32F to A8R8G8B8? When you
copy from X8R8G8B8 to A8R8G8B8, does it just memcpy the X channel into
the A channel, or set A = 0xff (or 0x00)?
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