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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003 The ScummVM project
* Copyright (C) 2003 Robert "LavosSpawn" Goeffringmann
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "skychannel.h"
#include "sound/fmopl.h"
SkyChannel::SkyChannel(uint8 *pMusicData, uint16 startOfData, FM_OPL *pOpl)
{
_musicData = pMusicData;
_opl = pOpl;
_channelData.startOfData = startOfData;
_channelData.eventDataPtr = startOfData;
_channelData.channelActive = 1;
_channelData.freqDataSize = 2;
_channelData.tremoVibro = 0;
_channelData.assignedInstrument = 0xFF;
_channelData.channelVolume = 0x7F;
_channelData.nextEventTime = getNextEventTime();
_channelData.adlibChannelNumber = _channelData.lastCommand = _channelData.note =
_channelData.adlibReg1 = _channelData.adlibReg2 = _channelData.freqOffset = 0;
_channelData.frequency = 0;
_channelData.instrumentData = NULL;
uint16 instrumentDataLoc = (_musicData[0x1206] << 8) | _musicData[0x1205];
_instrumentMap = _musicData+instrumentDataLoc;
_instruments = (InstrumentStruct*)(_instrumentMap+0x80);
_frequenceTable = (uint16*)(_musicData+0x7FE);
_registerTable = _musicData+0xDFE;
_opOutputTable = _musicData+0xE10;
_adlibRegMirror = _musicData+0xF5F;
_musicVolume = 0x100;
}
void SkyChannel::updateVolume(uint16 pVolume) {
_musicVolume = pVolume;
}
/* This class uses the same area for the register mirror as the original
asm driver did (_musicData[0xF5F..0x105E]), so the cache is indeed shared
by all instances of the class.
*/
void SkyChannel::setRegister(uint8 regNum, uint8 value) {
if (_adlibRegMirror[regNum] != value) {
OPLWriteReg(_opl,regNum,value);
_adlibRegMirror[regNum] = value;
}
}
void SkyChannel::stopNote(void) {
if (_channelData.note & 0x20) {
_channelData.note &= ~0x20;
setRegister(0xB0 | _channelData.adlibChannelNumber, _channelData.note);
}
}
int32 SkyChannel::getNextEventTime(void)
{
int32 retV = 0;
uint8 cnt, lVal;
for (cnt = 0; cnt < 4; cnt++) {
lVal = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
retV = (retV << 7) | (lVal & 0x7F);
if (!(lVal & 0x80)) break;
}
if (lVal & 0x80) { // should never happen
return -1;
} else return retV;
}
uint8 SkyChannel::process(uint16 aktTime) {
if (!_channelData.channelActive) {
return 0;
}
uint8 returnVal = 0;
_channelData.nextEventTime -= aktTime;
uint8 opcode;
while ((_channelData.nextEventTime < 0) && (_channelData.channelActive)) {
opcode = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
if (opcode&0x80) {
if (opcode == 0xFF) {
// dummy opcode
} else if (opcode > 0x9D) {
} else if (opcode >= 0x90) {
switch (opcode&0xF) {
case 0: com90_caseNoteOff(); break;
case 1: com90_stopChannel(); break;
case 2: com90_setupInstrument(); break;
case 3:
returnVal = com90_updateTempo();
break;
case 5: com90_getFreqOffset(); break;
case 6: com90_getChannelVolume(); break;
case 7: com90_getTremoVibro(); break;
case 8: com90_rewindMusic(); break;
case 9: com90_keyOff(); break;
case 12: com90_setStartOfData(); break;
case 4: //com90_dummy();
case 10: //com90_error();
case 11: //com90_doLodsb();
case 13: //com90_do_two_Lodsb();
error("SkyChannel: dummy music routine 0x%02X was called",opcode);
_channelData.channelActive = 0;
break;
default:
// these opcodes aren't implemented in original music driver
error("SkyChannel: Not existant routine 0x%02X was called",opcode);
_channelData.channelActive = 0;
break;
}
} else {
// new adlib channel assignment
_channelData.adlibChannelNumber = opcode&0xF;
_channelData.adlibReg1 = _registerTable[(opcode&0xF)<<1];
_channelData.adlibReg2 = _registerTable[((opcode&0xF)<<1)|1];
}
} else {
_channelData.lastCommand = opcode;
stopNote();
// not sure why this "if" is necessary...either a bug in my
// code or a bug in the music data (section 1, music 2)
if (_channelData.instrumentData || _channelData.tremoVibro) {
setupInstrument(opcode);
opcode = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
setupChannelVolume(opcode);
} else _channelData.eventDataPtr++;
}
if (_channelData.channelActive)
_channelData.nextEventTime += getNextEventTime();
}
return returnVal;
}
void SkyChannel::setupInstrument(uint8 opcode) {
uint16 nextNote;
if (_channelData.tremoVibro) {
uint8 newInstrument = _instrumentMap[opcode];
if (newInstrument != _channelData.assignedInstrument) {
_channelData.assignedInstrument = newInstrument;
_channelData.instrumentData = _instruments + newInstrument;
adlibSetupInstrument();
}
_channelData.lastCommand = _channelData.instrumentData->bindedEffect;
nextNote = getNextNote(_channelData.lastCommand);
} else {
nextNote = getNextNote(opcode - 0x18 + _channelData.instrumentData->bindedEffect);
}
_channelData.frequency = nextNote;
setRegister(0xA0 | _channelData.adlibChannelNumber, (uint8)nextNote);
setRegister(0xB0 | _channelData.adlibChannelNumber, (uint8)((nextNote >> 8) | 0x20));
_channelData.note = (uint8)((nextNote >> 8) | 0x20);
}
void SkyChannel::setupChannelVolume(uint8 volume) {
uint8 resultOp;
uint32 resVol = ((volume + 1) * (_channelData.instrumentData->totOutLev_Op2 + 1)) << 1;
resVol &= 0xFFFF;
resVol *= (_channelData.channelVolume+1)<<1;
resVol >>= 8;
resVol *= _musicVolume;
resVol >>= 16;
resultOp = ((_channelData.instrumentData->scalingLevel << 6) & 0xC0) | _opOutputTable[resVol];
setRegister(0x40 | _channelData.adlibReg2, resultOp);
if (_channelData.instrumentData->feedBack & 1) {
resVol = ((volume + 1) * (_channelData.instrumentData->totOutLev_Op1 + 1)) << 1;
resVol &= 0xFFFF;
resVol *= (_channelData.channelVolume + 1)<<1;
resVol >>= 8;
resVol *= (_musicVolume & 0xFF);
resVol >>= 16;
} else resVol = _channelData.instrumentData->totOutLev_Op1;
resultOp = ((_channelData.instrumentData->scalingLevel << 2) & 0xC0) | _opOutputTable[resVol];
setRegister(0x40 | _channelData.adlibReg1, resultOp);
}
void SkyChannel::adlibSetupInstrument(void) {
setRegister(0x60 | _channelData.adlibReg1, _channelData.instrumentData->ad_Op1);
setRegister(0x60 | _channelData.adlibReg2, _channelData.instrumentData->ad_Op2);
setRegister(0x80 | _channelData.adlibReg1, _channelData.instrumentData->sr_Op1);
setRegister(0x80 | _channelData.adlibReg2, _channelData.instrumentData->sr_Op2);
setRegister(0xE0 | _channelData.adlibReg1, _channelData.instrumentData->waveSelect_Op1);
setRegister(0xE0 | _channelData.adlibReg2, _channelData.instrumentData->waveSelect_Op2);
setRegister(0xC0 | _channelData.adlibChannelNumber, _channelData.instrumentData->feedBack);
setRegister(0x20 | _channelData.adlibReg1, _channelData.instrumentData->ampMod_Op1);
setRegister(0x20 | _channelData.adlibReg2, _channelData.instrumentData->ampMod_Op2);
}
#ifdef SCUMM_BIG_ENDIAN
#define ENDIAN16(x) ((x>>8)|((x&0xFF)<<8))
#else
#define ENDIAN16(x) (x)
#endif
uint16 SkyChannel::getNextNote(uint8 param) {
int16 freqIndex = ((int16)_channelData.freqOffset)-0x40;
if (freqIndex >= 0x3F) freqIndex++;
freqIndex *= _channelData.freqDataSize;
freqIndex += param<<6;
uint16 freqData = ENDIAN16(_frequenceTable[freqIndex%0x300]);
if ((freqIndex%0x300 >= 0x1C0) || (freqIndex/0x300 > 0)) {
return (((freqIndex/0x300)-1)<<10)+(freqData&0x7FF);
} else {
// looks like a bug. dunno why. It's what the ASM code says.
return (uint16)(((int16)freqData) >> 1);
}
}
//- command 90h routines
void SkyChannel::com90_caseNoteOff(void) {
if (_musicData[_channelData.eventDataPtr] == _channelData.lastCommand)
stopNote();
_channelData.eventDataPtr++;
}
void SkyChannel::com90_stopChannel(void) {
stopNote();
_channelData.channelActive = 0;
}
void SkyChannel::com90_setupInstrument(void) {
_channelData.channelVolume = 0x7F;
_channelData.freqOffset = 0x40;
_channelData.assignedInstrument = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
_channelData.instrumentData = _instruments + _channelData.assignedInstrument;
adlibSetupInstrument();
}
uint8 SkyChannel::com90_updateTempo(void) {
uint8 retV = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
return retV;
}
void SkyChannel::com90_getFreqOffset(void) {
_channelData.freqOffset = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
if (_channelData.note & 0x20) {
uint16 nextNote = getNextNote(
_channelData.lastCommand - 0x18 + _channelData.instrumentData->bindedEffect);
setRegister(0xA0|_channelData.adlibChannelNumber, (uint8)nextNote);
setRegister(0xB0|_channelData.adlibChannelNumber, (uint8)((nextNote>>8)|0x20));
_channelData.note = (uint8)(nextNote>>8)|0x20;
}
}
void SkyChannel::com90_getChannelVolume(void) {
_channelData.channelVolume = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
}
void SkyChannel::com90_getTremoVibro(void) {
_channelData.tremoVibro = _musicData[_channelData.eventDataPtr];
_channelData.eventDataPtr++;
}
void SkyChannel::com90_rewindMusic(void) {
_channelData.eventDataPtr = _channelData.startOfData;
}
void SkyChannel::com90_keyOff(void) {
stopNote();
}
void SkyChannel::com90_setStartOfData(void) {
_channelData.startOfData = _channelData.eventDataPtr;
}
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