XACT Distance->Volume RPCs require min/max values set about fna

[flibitijibibo]

I think it depends on the curve type, but at the moment we only do linear anyway so this is definitely a problem. If you want to dig through the curve data calclulation yourself:

Data parsing: https://github.com/FNA-XNA/FNA/blob/master/src/Audio/AudioEngine.cs#L300

Actual Math: https://github.com/FNA-XNA/FNA/blob/master/src/Audio/XACTInternal.cs#L233

My guess is it's line 250 that just needs to be capped, but mess around with the curves a bit in the tool and see what the outer bounds should do.

[teamtwentythree]

Maybe I'm not thinking of something, but I think 236->254 becomes the following. No need to special case 0 since it'll fall somewhere in the range anyway (Which seems bound from 0-X, but even if not it should be fine). For before the first point and after the last it would just be the value of the nearest point.

            // TODO: Non-linear curves
            if (varInput <= Points[0].X)
            {
                // Zero to first defined point
                return Points[0].Y;
            }
            else if (varInput >= Points[Points.Length - 1].X)
            {
                // Last defined point to infinity
                return Points[Points.Length - 1].Y;
            }
            else
            {

[flibitijibibo]

Give it a try locally, if it works I'll go ahead and write that in.

[teamtwentythree]

Yea, this fix is working for us.

[flibitijibibo]

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