thanks for the info... BTW, the thread that prompted me to ask the question in the first place is here:
http://lists.apple.com/archives/quartzcomposer-dev/2006/Feb/msg00065.html thanks again JC On Tue, Jul 1, 2008 at 5:17 PM, Christopher Wright <[EMAIL PROTECTED]> wrote: > I would love to have something like this working. However, everyone I have >> spoken to tells me that the protected memory architecture and driver model >> currently used forbids this sort of sharing. Im not smart >> enough/knowledgeable enough to know all the details of why, but im also >> stubborn enough to know there *has* to be a work around. i wrote that weird >> little plugin as a one potential (but kind of an ugly hack ish) work around. >> > > If it really is driver/VM (virtual memory) deep, the only workarounds would > be possibly Shared Memory (/usr/include/sys/shm.h) (not sure how that would > work with non-system memory resources though) or a kext that does the shim > thing you mention later... > > Id imagine some sort of API would be required to know the memory locations >> of the resources on the GPU (ie, this offset / location for texture a, etc), >> and that information would have to be constantly synced between apps - but I >> have no idea even where to begin for those sorts of endeavors. >> >> Perhaps a standalone shim app that acts as a GPU server/resource >> allocator, which handles 'locking' issues of who has read/write to a >> texture/buffer to alleviate potential conflicts? No app would then actually >> own the resources, but would send them and recieve them from the shim layer? >> That sounds awefully complicated, and would require re-thinking of the whole >> pipeline... >> > > Rather than a shim, the drivers could be modified (with another gl > extension, for example) to abstract this -- they already manage resources in > exactly the same way, so I'm guessing you'd just add some flags for > shareability, and calls to set/control those flags, and be done with it. I > have no if this is reasonable, or if there's already something like this in > place.... </wildSpeculation> > > > -- > [ christopher wright ] > [EMAIL PROTECTED] > http://kineme.net/ > >
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