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

Henri Verbeet hverbeet at gmail.com
Wed Jul 15 03:47:35 CDT 2015

On 8 July 2015 at 10:52, Stefan Dösinger <stefandoesinger at gmail.com> wrote:
> 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.
Actually, it would probably be helpful to have an overview of how this
is all going to work in the end. E.g., how is ddraw_surface7_Flip()
going to work with the new setup?

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