[PATCH 1/4] d3d9/tests: Add a windowed GetFrontBufferData test.

[Stefan Dösinger]

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Am 2015-07-08 um 09:26 schrieb Henri Verbeet:
> I theory, once the shadowfb is moved from ddraw to wined3d we'd
> never read from the real drawable anymore.
I don't think we want to use the shadowfb unconditionally. It would
mean an extra copy (shadow backbuffer -> shadow frontbuffer -> GL_BACK
- -> swap as opposed to shadow backbuffer -> GL_BACK -> swap). I don't
think a reliable GetFrontBufferData is worth the extra copy,
especially since GetFrontbufferData isn't reliable on Windows either
(But ChildWindowFromPoint is).

We need the shadowfb for ddraw (esp. overlays, but also other corner
cases) and swapeffect_flip, although in that case we ideally swap the
FBOs and avoid the shadow backbuffer -> shadow frontbuffer blit and
just do shadow frontbuffer -> GL_BACK -> swap. In theory we also want
the shadow frontbuffer for a correct software cursor, but there are
other problems with that.

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