This commit adds the following functionality to the MIDI drivers:
- Add checking if a driver is ready to process MIDI events for a specific
source (rather than any source). To facilitate this, SysExes can now be sent
using a source number. This is stored with the SysEx data in the SysEx queue
and can be checked when isReady is called with a source number.
- Allow specifying controller default values per MIDI channel. Currently this
is only implemented for program.
- The OPL dynamic channel allocation algorithm will now respect statically
allocated channels, in case a subclass uses combined static and dynamic channel
allocation.
It also fixes the following bugs:
- Instrument remapping can now be specified using const arrays.
- OPL instrument writing code is refactored to a separate function.
- OPL note on with velocity 0 would be handled as a note off, and then
continued to be processed as a note on.
- OPL writeFrequency would always write key on bit, even if the note is not
active.
- MT-32 default channel volume was incorrect.
This commit adds a function to the multisource MIDI drivers for specifying an
arbitrary instrument map for remapping the instruments in the MIDI data.
This is used for remapping instruments from two Simon 2 GM tracks to MT-32
because they are missing from the MT-32 MIDI data set.
This adds support for the OPL rhythm mode to the AdLib multisource MIDI driver.
Some games (f.e. Simon 1) use this to generate the rhythm sounds of their music.
This commit adds a feature to the multisource MIDI drivers which allows setting
a default value for most controllers. This default is then applied at the start
of every new track, which ensures controllers are in the correct state.
This can be used for games which use some controller, but do not reset it at
the start of each track, which can lead to incorrect playback.
The empty OPL instrument check would check only the ADSR envelope fields for 0,
assuming this would mean the instrument would produce no sound. However, some
of these fields are flipped, i.e. max value would produce no sound. So this
shortcut was invalid. It is replaced by checking all fields for 0.
This adds a MIDI driver for AdLib / OPL2 and OPL3 with support for multiple
simultaneous sources of MIDI data. Additionally, it is easier to subclass the
driver and customize its behavior than the existing AdLib MIDI driver. The
standard behavior matches the Windows 95 SB16 driver.
