If src_occlusion_mb is 0, it'll be multiplied with whatever the ratio ends up
being, which will result in 0 anyway. A number of uses also already check the
occlusion value before calling the method.
* Fix possible C2084 compiler error
Guiddef.h uses a separate header guard to define the GUID operators, in the current codebase this won't cause any issue, but i got such error while fiddling a bit with the program and including something that ended up including all the various windows headers, that ended up including Guiddef.h, causing the error as by not finding the macro declared, it ended up declaring the inline operators as well.
* Update api.h
Source's oclussion and exclusion properties should be taken into account only for listener's environment (see p. 16, p. 56, pp. 62-63 and p. 64 of "EAX® 4.0 Programmer’s Guide").
* [EAX] Use separate FX slot state for each version
[EAX] Don't defer FX slot properties
* [EAX_FXSLOT] Use mPropsDirty to defer update
[EAX_CONTEXT] Commit all updates on first initialization
Some systems don't like having a space in the export declaration, with windres
interpreting the extra attributes as input files. GCC seems to accept the
attributes being "packed" together, which avoids the problem with windres.
Currently there's no way for an application to specify the "real world" scale
for in-game units. If the game doesn't use one unit to represent what should be
perceived as one meter to the user, the NFC filter's effect will be too near or
too far sounding. This allows adjusting the unit scale as applied to the NFC
filters only, correcting the misalignment.
This also removes the influence of EFX's MetersPerUnit from the NFC filters,
since many games don't use it, and those that do won't know it also influences
the perceived wave curvature along with the air absorption strength.
This can be used to specify an average speaker distance without having the
modify the decoder config files. This also sets a default value of 1, letting
near-field effects work (if imprecisely) without an explicitly-configured
distance.
