Hi John et al,
On 4/29/05, John Stiles <email@hidden> wrote:
CGL is meant for full-screen (on one screen), or off-screen imaging.
http://developer.apple.com/documentation/GraphicsImaging/Reference/
CGL_OpenGL/
I've looked at this reference documentation, but it really doesn't
answer a some key questions, I'm really after a programming guide or
tutorial. Do any exist?
What I'm looking for is a full-screen, but across two screens. The
introductary paragraph to CGL suggests that its Core OpenGL and that
the lowest level integration possible, which suggest that agl etc
would be based on top of it... so any fucntionality in supporting a
single graphics context across two windows should also be possible in
CGL.
You could try to change the existing code to render to an extra-wide
offscreen buffer and then present it to the user yourself with
whatever
method you choose
Rendering to an offscreen buffer then pasting on screen would be awful
for peformance and a complete backwards step. I know what I'm after
*should* be possible - its even possible under GLX under the OSX, its
even possible to stretch a single window across two screens, all
suggesting the lowest level CGL should also be able to do it, this
really shouldn't need to be that complicated, I would have expected a
simple parameters to set it.
Does any Apple engineers have an insight there can share here? Is it
possible to open up a single graphics context across screens under
CGL??
--the path of least resistance would be a window
spanning the two screens (or maybe two windows, one spanning each
screen). You can make the windows borderless and hide the system GUI,
so it will still be immersive. Using CGL for this work is sort of
swimming against the current, though, since Apple explicitly designed
agl and NSOpenGLView for windowed OpenGL display, and they take care
of
a lot of the hassles for you automatically.
I don't need a border window right now, but if CGL ain't up to the
task then I will have to dump it and go for agl. However, I'd rather
not learn a new API just because I haven't been able to track down a
simple setting in CGL.
