[Bug 2082] DirectDraw games only showing black screen

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=2082

--- Comment #170 from Saulius K. <saulius2 at gmail.com> ---
Found some MSDN article called "Redirecting GDI, DirectX, and WPF applications"
[4].  How do devs think, can it bring some simplicity for the situation?

--- quote ---
Mixed DirectX and GDI Windows

The other reasonably common rendering to a top level window involves mixing
DirectX and GDI.  There are two forms of "mixing" here, one is perfectly fine,
and the other is problematic. 


_The form of mixing that is fine_ is when there is a window tree of the top
level HWND and child HWNDs (and further children, etc), where each individual
HWND is either rendered by DirectX or by GDI.  In this situation, the
redirection component of the DWM forms its own "composition tree" where each
node in the tree represents a node or a set of "homogenously rendered nodes" in
the "window tree" rooted at the top level HWND.  Rendering occurs by having
each of these render to their own surface, and then compositing this tree of
surfaces to the desktop.  Thus, mixed DirectX and GDI rendering works well, so
long as the boundary between them is at least at the child HWND level.


_The form of mixing that _doesn't work well_ is when an application uses
DirectX and GDI to target the same HWND.  This has never been a supported
scenario with DirectX, but there have been scenarios where it has happened to
work.  Under the DWM, this is much more problematic, because there can be no
guarantee of ordering between the DirectX and the GDI rendering.  This is most
troublesome when GDI and DirectX are not only rendering to the same HWND, but
to overlapping areas of the same HWND.  As such, this usage pattern is not
supported.  Note that there is an alternative that can often work for an
application -- DirectX is capable of handing back a DC to a DirectX surface,
and applications can perform GDI rendering to that DC.  From the DWM's
perspective, that DirectX surface remains purely rendered by DirectX, and all
is well.
--- quote ---

[4]
https://blogs.msdn.microsoft.com/greg_schechter/2006/05/03/redirecting-gdi-directx-and-wpf-applications/

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