Hi Christoph,
Christoph Fünfzig wrote:
> Yes, I think, this is a natural generalization. The istreamhandler could
> also create a local temporary if required
> and do some bookkeeping, which files have been accessed for a scene.
>
the problem is for it to figure out what else to download. I don't have
a good, general solution for that, unless it is used to open the file.
> Oh, along the lines of virtual file systems there is also
> http://witme.sourceforge.net/libferris.web/features.html (linux only)
> which is called semantic virtual file system, as it also holds metadata
> gathered from the file source
> and the file header/contents itself.
> But I guess, all those are quite system dependent.
>
Yeah, that's a problem. PhysFS is more portable but not very general.
> I do not know if it is worth it to redirect or to emulate plain Cs FILE*
> behaviour (like downloading
> the required file to a local temporary and then open as a FILE* ..).
> Without a virtual file system approach those loaders would always
> require modification.
>
I think it should work easily for all the image loaders. Either we
change them to iostream (HDR), or they have facilities to read from
abstract data source anyway (JPG, PNG). We can probably cover/convert
all the stuff that we have in FileIO like 3DS relatively well. Where we
get into trouble are things that use external libraries for loading,
like Inventor or Performer. But for those I don't think there is
anything we can do, but it might make sense to have a fallback mechanism
that at least downloads the main file and runs the loader on it.
> With istreams it seems easier. The library boost.asio pointed out by
> Allen seems to fit in nicely here
> with boost.iostreams.
> I need to get some practice with it.
> Currently, there are some loaders which open additional streams during
> loading besides the one passed in.
>
Only the model loaders, and for those I don't see away around it, honestly.
Dirk
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