AliceLR ef6f352892 Replace bidirectional loop unrolling with reverse sample rendering. ...

Fixes numerous issues in the software renderer caused by bidi
sample unrolling and the messes and hacks it required elsewhere:

* Bidirectional looped samples no longer take up to twice as much RAM.
* IT sustain loops no longer require duplicate sample data.
* IT bidirectional sustain loops should work properly now.
* Other formats that want to use sustain loops should no longer require
  sample duplication hacks.
* The software mixer should no longer occasionally skip output samples
  when the voice position passes the end of the sample.
* Added regression test to ensure both XM and IT bidirectional sample
  loops render the same as their forward loop counterparts.

2021-12-26 00:44:58 -07:00

17 KiB

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