WineD3D: move fake context code over to WGL

[Chris Robinson]

On Tuesday 07 August 2007 06:54:37 am Alexandre Julliard wrote:
> Roderick Colenbrander <thunderbird2k at gmx.net> writes:
> > Subject: [PATCH] Move WineD3D_CreateFakeGLContext and friends over
> > to WGL. For this we need a HDC and one received from lets say
> > GetDC(0) won't do. Further this HDC needs CS_OWNDC set. For this
> > reason we need our own window class.
>
> Why does it need CS_OWNDC?  That sounds like a bug.

I ran across mailing list posts a while ago talking about OpenGL on Windows, 
and it mentioned that the window class had to have CS_OWNDC otherwise strange 
anomolies and crashes could pop up. Stefan Dösinger also said it's implied 
that D3D windows need the same. Searching google for 'opengl cs_owndc' 
brought up pages that mentioned buggy drivers need it, and as well, 
opengl.org's FAQ has it mentioned:

"error: Multiple access violations appear when running a Microsoft OpenGL 
MFC-based application.

solution: Set the CS_OWNDC style in the PreCreate*() routines in the view 
class."

http://www.opengl.org/resources/faq/technical/gettingstarted.htm

I can't say I know much about how HDCs work, but since OpenGL operates on HDCs 
and expects their state to remain constant through the life of the window, 
wouldn't it be a problem if DCs switched after a call to SetPixelFormat, or 
while it's part of the current context?