Hi Erik, Erik Hofman schrieb am 27.06.2007 09:04: > Melchior FRANZ wrote: > > >> So it's now also clear that we have to fix FlightGear's broken >> sound ourselves for 0.9.11 (fg/plib branch). If it can be done >> in a way that doesn't break the current framework and makes clear >> which parts are the workaround (by using #ifdefs and comments, >> as is the case already) then committing it is really the only option. >> > > Too bad we have to do this, but ... > could we make it a runtime test instead (if running windows and OpenAL > Version < 1.2) or something like that? > > That would be the best. But how to know, that 1.2 would work? It looks like, if the OpenAL Doppler effect bugs are a never ending story. And they do not work correctly at Linux (at least not on every build). For a short while I thought it would be the best, to use always the own calculation. But then I learned, that some (all?) Linux versions of OpenAL report them self as version 1.1 (in the header file), but do limit the allowed pitch range of a sound, which is in contrary to the OpenAL 1.1 spec. Let see, what the AL_VERSION - query reports on this systems. But my calculation modify the sound by changing the pitch, and some aircrafts uses the full pitch range even without Doppler effects. But it seems, that this versions of OpenAL do correct Doppler calculations, if the listener velocity is fixed to 0. Therefore it would work, to set the source velocity to the relative velocity from source and listener. Physically not correct, but much better than no Doppler Effect. (In all cases It will be possible to switch off the own calculation by one #define). > Erik
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