WineD3D: flush gl buffers are blt to drawable [attempt2]

[Stefan Dösinger]

Am Donnerstag, 8. November 2007 23:40:18 schrieb Roderick Colenbrander:
> Hi,
>
> This patch makes sure the gl buffer is flushed after blitting to the
> screen. This fixes bug 9826 where traces of old frames appeared due to
> this.
You really shouldn't do this unconditionally, it is only needed if two 
contexts are drawing to the same drawable. A suggestion would be to mark the 
first use of a 2nd thread in a device in FindContext, and call the glFlush 
only if happened.

The same glFlush is needed in all other places that draw something to the 
drawable: drawprim, clear and BltOverride come to my mind.
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