On Apr 29, 2005, at 12:21 PM, Robert Osfield wrote:
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're going to be limited by the max viewport dim's, so unless your
going to require a nVIDIA 6800, your two screens could only be 1024 px
wide each, and most people with multiple screens will have resolutions
much larger than that.
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.
Your large offscreen buffer can be fully hardware accelerated (ie in
VRAM), and copying pixels from VRAM to VRAM is very quick with the
additional benefit that the hardware wouldn't have to stride
motherboard memory. This would allow you to use two separate
fullscreen contexts, easily double-buffered, or faster if
single-buffered (if want to perform your own VBL sync'ed blits)... and
now that Tiger is okay to discuss: you can use CoreVideo callbacks to
achieve VBL swaps on a high-priority kernel thread.
--
Shaun Wexler
MacFOH http://www.macfoh.com
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