[Bf-committers] First HDC in Windows GHOST

[Jason Wilkins]

OK, it appears that EGL handles this similarly to GLX since the
eglCreateContext function has the same argument.

My main question was about the first_hDC argument though.  I'm thinking it
probably isn't needed to keep the first_hDC around for EGL sharing since
maybe Direct3D won't have the same bug that required keeping the first_hDC
around for WGL programs.

I'll just make a note of it now in case it causes problems later.


On Mon, Jul 22, 2013 at 1:29 PM, Campbell Barton <ideasman42 at gmail.com>wrote:

> X11 glXCreateContext() passes the first context as the 3rd argument
> (called shareList).
>
> Ghost/SDL uses SDL_GL_SHARE_WITH_CURRENT_CONTEXT.
> According to SDL's commit log this works on windows & linux.
> you could check on SDL source and see how they handle this on windows.
>
> On Tue, Jul 23, 2013 at 4:11 AM, Brecht Van Lommel
> <brechtvanlommel at pandora.be> wrote:
> > Both X11/Cocoa have a similar first GLXContext/NSOpenGLContext that is
> > not deleted, so I don't think it's specific to Windows.
> >
> > Textures (fonts, icons, images) and other OpenGL buffer are shared
> > between windows, I'm not sure how this stuff works but I guess they
> > are somehow linked to the first context.
> >
> > On Mon, Jul 22, 2013 at 9:52 AM, Jason Wilkins
> > <jason.a.wilkins at gmail.com> wrote:
> >> It appears that when creating a GHOST window in Windows that it only
> calls
> >> ReleaseDC on it if it is not the first one created.
> >>
> >> Does this have to do with WGL's DisplayList sharing or some other quirk
> of
> >> windows?
> >>
> >> The reason I ask is because if it only has to do with features in WGL
> then
> >> I can ignore it, but if it is more general behavior then I'll need to
> make
> >> sure the EGL branch also avoids deleting the first DC as well.
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>
> --
> - Campbell
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