pfAllocChanData

Angus Henderson (angus++at++death.reading.sgi.com)
Tue, 11 Oct 94 10:13:01 GMT

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Let us say I have a (PassData*) structure called FishPass which
holds all the fish data in the APP, if I had one channel I
would read the man page on pfAllocChanData and do

FishPass = (PassData*)pfAllocChanData( chan , sizeof(PassData) );

Then in each PreFrame I would

pfPassChanData(chan);

That is easy and it works, but I have three channels. Each seems to need
a personal "pfAllocChanData". However I only have one FishPass data
structure which is re-calculated once each pass after pfFrame in APP.

I have tried pfMalloc'ing FishPass once, then pfAllocChanData'ing
three channel data structures one for each channel, then copying
the contents of FishPass into the relevant channel data structure.
But this Segmentation faults each time.

    if(first)
    {
        for( i = 0; i < NumChans; i++)
        {
            passPtr[i] = (PassData*)pfAllocChanData(Chan[i], sizeof(PassData));
        }
        first = 0;
    }
     
    for( i = 0; i < NumChans; i++)
    {
        memcpy( passPtr[i] , FishPass, sizeof(PassData));
        pfPassChanData(Chan[i]);
    }

Have I missed the point somewhere ?

How do you send a single piece of Passdata to multiple channels ?

Angus
(Henderson
The Reality Centre)

"Imagine your witty quote here"

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