[Coco] OVCC project update.

[Steve Pedersen]

What he said, your work on this is awsome.
having a open source cross platform version of vcc will be absolutely fab.
thank you for your efforts.


On Sat, Aug 18, 2018, 3:31 AM Joel Rees <joel.rees at gmail.com> wrote:

> Wish I could send you more help than a thumbs-up.
>
> 2018年8月17日(金) 10:14 Walter Zambotti <zambotti at iinet.net.au>:
>
> > So the audio/sound component of direct/x/sound is the last component to
> be
> > converted to SDL.
> >
> >
> >
> > In comparison to the graphics conversion it has been challenging.  Where
> > the
> > graphics models between directx and sdl are similar enough that the
> > conversion was straight forward the audio models are considerably
> > different.
> >
> >
> >
> > Direct Sound has devices and devices are allocated sound buffers. The
> user
> > has sound samples stored in memory. The user copies his sound sample from
> > memory to a sound buffer.  Basically a memory to memory copy.  It was up
> to
> > VCC to figure out what and where to copy.  So in VCC there were a lot of
> > buffer pointers maintained and logic to maintain a circular buffer.
> >
> >
> >
> > SDL however has sound devices and sound queues (not buffers).  The user
> has
> > samples stored in memory. The user just submits the sample to the queue.
> > There's no concept of manipulating the sound buffers after that stage.
> >
> >
> >
> > So all the VCC sound buffer logic seems irrelevant.  So my SDL sound
> > interface has very little code.
> >
> >
> >
> > In VCC whenever something is written to the sound register at FF22 (from
> > memory) that value is also recorded in a small buffer (array) and once
> > every
> > 1/60 sec that small buffer is sent to the direct sound interface to place
> > in
> > the next position in the sound device's circular buffer.
> >
> >
> >
> > In SDL all I can do with that small buffer is queue it to the SDL sound
> > device.
> >
> >
> >
> > So I have written the SDL sound code that I believe will work and I now
> > begin to debug it.
> >
> >
> >
> > So keep your fingers crossed that that is all I need to do (queue it) !!!
> >
> >
> >
> > Walter
> >
> >
> >
> >
> >
> >
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> >
>
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