[Openal-devel] Map/Unmap API

[Guilherme Balena Versiani]

Just to add more fuel to the fire, I rather like this idea too.

- Balena.


Sherief N. Farouk escreveu:
>> In OpenGL, you can create PBOs to store pixel data to read from and
>> write to
>> textures and render surfaces. It allows for fast access as calls like
>> glTexImage2D and co. can be scheduled to occur later and via DMA
>> transfers. It
>> also allows an app to map/unmap it to read and/or write quickly.
>>
>> Something like this could be useful to OpenAL too, I think. Often times
>> when
>> audio is decompressed, it requires the app to have a memory segment to
>> write
>> to and give to alBufferData. Since alBufferData needs to finish with
>> the user
>> pointer before returning, this would cause unnecessary waiting while
>> it's
>> copied and potentially converted. This would also be an issue for real-
>> time
>> generated streamed sounds.
>>
>>     
>
> I suggested this on the mailing list in March 2008, But it didn't make it
> through (You can check the thread, called "Faster buffer model, and more
> random stuff" for details of the discussion). Since then, I've implemented
> two revisions of this map/unmap buffer model (the latter more strongly
> worded than the former) and found it to be a bit faster (especially on
> in-order architectures) and it saved me having to use a proprietary
> extension on a gaming console, so I'd highly recommend it.
>
> - Sherief
>
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