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Set down in comments what I know about _outputTable[], and what I suspect about

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_unkTable[]. Investigating the latter further might help unravelling several of
the "unk" variables. (Right now, I'm suspecting that unk15 is the pitch bend.)

svn-id: r21164
This commit is contained in:
Torbjörn Andersson 2006-03-09 12:36:11 +00:00
parent 9d19f7d32e
commit 671450fcb8
1 changed files with 11 additions and 0 deletions
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11
engines/kyra/sound_adlib.cpp
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@ -1788,11 +1788,22 @@ const AdlibDriver::ParserOpcode AdlibDriver::_parserOpcodeTable[] = {
const int AdlibDriver::_opcodesEntries = ARRAYSIZE(AdlibDriver::_opcodeList);
const int AdlibDriver::_parserOpcodeTableSize = ARRAYSIZE(AdlibDriver::_parserOpcodeTable);
// This table holds the register offset for operator 1 for each of the nine
// channels. To get the register offset for operator 2, simply add 3.
const uint8 AdlibDriver::_outputTable[] = {
0x00, 0x01, 0x02, 0x08, 0x09, 0x0A, 0x10, 0x11,
0x12
};
// Given the size of this table, and the range of its values, it's probably the
// F-Numbers (10 bits) for the notes of the 12-tone scale. However, it does not
// match the table in the Adlib documentation I've seen.
//
// The values from this table is always added to state.unk15, which could make
// unk15 a pitch bend factor of some kind, and updateCallback20() would then
// be update_setPitchBend().
const uint16 AdlibDriver::_unkTable[] = {
0x0134, 0x0147, 0x015A, 0x016F, 0x0184, 0x019C, 0x01B4, 0x01CE, 0x01E9,
0x0207, 0x0225, 0x0246