opengl32: Correctly size and position opengl child windows

Willie Sippel willie at
Fri Oct 6 11:09:40 CDT 2006

Am Freitag, 6. Oktober 2006 15:26 schrieb Ulrich Czekalla:
>  From our discussions at wineconf we concluded that overriding the various
> functions such as glViewport and glScissor will get us there for most
> applications.
> The only thing this will not do is handle the case where a child window
> overlaps a opengl child window. In this case the best solution is to use a
> glX extension that would allow us to provide a clip region to clip the
> overlapping child windows. The big question is this really necessary.  How
> many applications make use of this? I don't know the answer.
If I understand your question correctly, I'm sad to say that most applications 
using OpenGL viewports have overlapping child windows - especially pro 
applications/ content creation applications. You might want to try DAZ|Studio 
for reference, as it's freeware and shows what I mean. It's available at 

I'd test your patch myself, but OpenGL in Wine is completely broken for me for 
a few weeks now, and I have no idea how to fix it (D3D works just fine, 


Willie Sippel

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