Re: [Tuxnes-devel] Smoother scrolling

[Jason D. S. <jd...@us...>]

Ryan Jackson wrote:
> On Mon, Jan 19, 2004 at 02:27:47PM -0500, Jason Dorje Short wrote:
> 
>>This is hard to change because timeframe is a very different concept. 
>>But this patch may be a little better (now that I got tuxnes to 
>>compile).  It's indistinguishable from the current behavior on my computer.
> 
> 
> It works great on mine... for about a minute, then the emu goes nuts.
> usec overflows and wraps around, becoming negative.  Because of that, it
> thinks we've missed a whole crapload of frames, so it just resyncs over
> and over again.

It wraps around on frame 2148.  Imagine that.  In part this comes 
because of my overzealous desire to be accurate: I use

   (1,000,000 * frame) / 60

instead of

   (1,000,000 / 60) * frame

but I guess the problem would kick in after about 60 minutes anyway, so 
it's just as well.  This calculation needs to be done with an 8-byte 
"long long".  (Side note: I didn't know a "long" was only 4 bytes???)

Instead of using "long long" it would be nice to use sint64, if such a 
thing exists.  SDL defines an Sint64, but not all of the code uses SDL, 
right?

So, here's a new patch.

Does this work better than the current behavior on your system?

jason