Path: utzoo!utgpu!attcan!uunet!lll-winken!ames!pasteur!agate!ucbvax!decwrl!labrea!polya!rokicki
From: rokicki@polya.Stanford.EDU (Tomas G. Rokicki)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Unsupported Programming Practices
Message-ID: <5932@polya.Stanford.EDU>
Date: 7 Jan 89 00:24:46 GMT
References: <8901060406.AA22607@postgres.Berkeley.EDU> <84277@sun.uucp>
Organization: Stanford University
Lines: 16

> > Is there some call one can make which ensures any blitter usage from the 
> > previous graphics library call will complete before returning?
> Would OwnBlitter() work for this? I assume that the sequence :
> 	Draw(...);
> 	OwnBlitter();
> Can't possibly give you the Blitter before the Draw call has finished
> with it.

Nicht, won't work.  Even after OwnBlitter() the blitter could very
well be doing a blit; you need a WaitBlit() after that before using
the blitter.  The correct technique is WaitBlit().  This assumes
that Draw() (or the other graphics routines) do not return with more
than one Blit pending (yes, a Draw can require multiple blits).
Can this be guaranteed, Dale?

-tom