it's posible to kwon, the free AGP memoy ?
I don't think so. you probably have to keep track of memory yourself using some sort of memory manager.
Why would you want to? most of the time you can leave it up to the gpu to sort that out.
it depends on the interface level he wants to have..
in dx you can get info on how much memory you have left..
can be quite useful for lowlevel stuff..
but yes, all the apis are so nice to us that they manage the memory themselfes.. all except nvidia extensions.. anyone remembers VAR?
Tasking the AGP memory yourself might be a little slow anyway. Although video memory is faster than system memory, it's usually only true for when the video card itself accesses it. Drawing on video memory from the CPU is not something I recomend.
actually, if you use the right (noncacheing) write instruction, its quite fast..
and with VAR, you can manage your memory yourself if you want (nvidia being lazy => developer had to learn how to write memory managers.. )..
but yes, in any normal api you don't neeeeed to know it.. it would be sort of nice anyways sometimes..