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https://github.com/libretro/scummvm.git
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345 lines
11 KiB
C++
345 lines
11 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2003-2006 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#include "common/stdafx.h"
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#include "common/util.h"
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#include "sky/music/adlibchannel.h"
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#include "sky/sky.h"
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namespace Sky {
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AdlibChannel::AdlibChannel(FM_OPL *opl, uint8 *pMusicData, uint16 startOfData) {
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_opl = opl;
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_musicData = pMusicData;
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_channelData.startOfData = startOfData;
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_channelData.eventDataPtr = startOfData;
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_channelData.channelActive = 1;
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_channelData.freqDataSize = 2;
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_channelData.tremoVibro = 0;
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_channelData.assignedInstrument = 0xFF;
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_channelData.channelVolume = 0x7F;
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_channelData.nextEventTime = getNextEventTime();
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_channelData.adlibChannelNumber = _channelData.lastCommand = _channelData.note =
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_channelData.adlibReg1 = _channelData.adlibReg2 = _channelData.freqOffset = 0;
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_channelData.frequency = 0;
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_channelData.instrumentData = NULL;
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uint16 instrumentDataLoc;
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if (SkyEngine::_systemVars.gameVersion == 109) {
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//instrumentDataLoc = (_musicData[0x11D0] << 8) | _musicData[0x11CF];
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//_frequenceTable = (uint16*)(_musicData + 0x835);
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//_registerTable = _musicData + 0xE35;
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//_opOutputTable = _musicData + 0xE47;
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//_adlibRegMirror = _musicData + 0xF4A;
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instrumentDataLoc = READ_LE_UINT16(_musicData + 0x1204);
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_frequenceTable = (uint16*)(_musicData + 0x868);
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_registerTable = _musicData + 0xE68;
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_opOutputTable = _musicData + 0xE7A;
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_adlibRegMirror = _musicData + 0xF7D;
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} else if (SkyEngine::_systemVars.gameVersion == 267) {
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instrumentDataLoc = READ_LE_UINT16(_musicData + 0x11FB);
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_frequenceTable = (uint16*)(_musicData + 0x7F4);
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_registerTable = _musicData + 0xDF4;
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_opOutputTable = _musicData + 0xE06;
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_adlibRegMirror = _musicData + 0xF55;
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} else {
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instrumentDataLoc = READ_LE_UINT16(_musicData + 0x1205);
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_frequenceTable = (uint16*)(_musicData + 0x7FE);
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_registerTable = _musicData + 0xDFE;
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_opOutputTable = _musicData + 0xE10;
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_adlibRegMirror = _musicData + 0xF5F;
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}
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_instrumentMap = _musicData+instrumentDataLoc;
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_instruments = (InstrumentStruct*)(_instrumentMap+0x80);
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_musicVolume = 0x100;
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}
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bool AdlibChannel::isActive(void) {
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return _channelData.channelActive != 0;
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}
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void AdlibChannel::updateVolume(uint16 pVolume) {
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_musicVolume = pVolume * 3;
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}
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/* This class uses the same area for the register mirror as the original
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asm driver did (_musicData[0xF5F..0x105E]), so the cache is indeed shared
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by all instances of the class.
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*/
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void AdlibChannel::setRegister(uint8 regNum, uint8 value) {
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if (_adlibRegMirror[regNum] != value) {
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OPLWriteReg (_opl, regNum, value);
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_adlibRegMirror[regNum] = value;
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}
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}
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void AdlibChannel::stopNote(void) {
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if (_channelData.note & 0x20) {
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_channelData.note &= ~0x20;
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setRegister(0xB0 | _channelData.adlibChannelNumber, _channelData.note);
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}
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}
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int32 AdlibChannel::getNextEventTime(void) {
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int32 retV = 0;
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uint8 cnt, lVal = 0;
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for (cnt = 0; cnt < 4; cnt++) {
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lVal = _musicData[_channelData.eventDataPtr];
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_channelData.eventDataPtr++;
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retV = (retV << 7) | (lVal & 0x7F);
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if (!(lVal & 0x80)) break;
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}
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if (lVal & 0x80) { // should never happen
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return -1;
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} else return retV;
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}
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uint8 AdlibChannel::process(uint16 aktTime) {
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if (!_channelData.channelActive) {
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return 0;
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}
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uint8 returnVal = 0;
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_channelData.nextEventTime -= aktTime;
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uint8 opcode;
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while ((_channelData.nextEventTime < 0) && (_channelData.channelActive)) {
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opcode = _musicData[_channelData.eventDataPtr];
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_channelData.eventDataPtr++;
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if (opcode & 0x80) {
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if (opcode == 0xFF) {
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// dummy opcode
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} else if (opcode >= 0x90) {
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switch (opcode&0xF) {
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case 0: com90_caseNoteOff(); break;
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case 1: com90_stopChannel(); break;
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case 2: com90_setupInstrument(); break;
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case 3:
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returnVal = com90_updateTempo();
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break;
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case 5: com90_getFreqOffset(); break;
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case 6: com90_getChannelVolume(); break;
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case 7: com90_getTremoVibro(); break;
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case 8: com90_rewindMusic(); break;
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case 9: com90_keyOff(); break;
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case 12: com90_setStartOfData(); break;
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case 4: //com90_dummy();
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case 10: //com90_error();
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case 11: //com90_doLodsb();
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case 13: //com90_do_two_Lodsb();
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error("Channel: dummy music routine 0x%02X was called",opcode);
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_channelData.channelActive = 0;
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break;
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default:
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// these opcodes aren't implemented in original music driver
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error("Channel: Not existent routine 0x%02X was called",opcode);
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_channelData.channelActive = 0;
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break;
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}
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} else {
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// new adlib channel assignment
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_channelData.adlibChannelNumber = opcode&0xF;
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_channelData.adlibReg1 = _registerTable[(opcode&0xF)<<1];
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_channelData.adlibReg2 = _registerTable[((opcode&0xF)<<1)|1];
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}
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} else {
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_channelData.lastCommand = opcode;
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stopNote();
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// not sure why this "if" is necessary...either a bug in my
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// code or a bug in the music data (section 1, music 2)
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if (_channelData.instrumentData || _channelData.tremoVibro) {
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setupInstrument(opcode);
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opcode = _musicData[_channelData.eventDataPtr];
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_channelData.eventDataPtr++;
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setupChannelVolume(opcode);
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} else _channelData.eventDataPtr++;
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}
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if (_channelData.channelActive)
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_channelData.nextEventTime += getNextEventTime();
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}
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return returnVal;
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}
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void AdlibChannel::setupInstrument(uint8 opcode) {
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uint16 nextNote;
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if (_channelData.tremoVibro) {
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uint8 newInstrument = _instrumentMap[opcode];
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if (newInstrument != _channelData.assignedInstrument) {
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_channelData.assignedInstrument = newInstrument;
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_channelData.instrumentData = _instruments + newInstrument;
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adlibSetupInstrument();
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}
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_channelData.lastCommand = _channelData.instrumentData->bindedEffect;
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nextNote = getNextNote(_channelData.lastCommand);
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} else {
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nextNote = getNextNote(opcode - 0x18 + _channelData.instrumentData->bindedEffect);
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}
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_channelData.frequency = nextNote;
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setRegister(0xA0 | _channelData.adlibChannelNumber, (uint8)nextNote);
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setRegister(0xB0 | _channelData.adlibChannelNumber, (uint8)((nextNote >> 8) | 0x20));
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_channelData.note = (uint8)((nextNote >> 8) | 0x20);
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}
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void AdlibChannel::setupChannelVolume(uint8 volume) {
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uint8 resultOp;
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uint32 resVol = ((volume + 1) * (_channelData.instrumentData->totOutLev_Op2 + 1)) << 1;
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resVol &= 0xFFFF;
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resVol *= (_channelData.channelVolume+1)<<1;
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resVol >>= 8;
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resVol *= _musicVolume;
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resVol >>= 16;
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resultOp = ((_channelData.instrumentData->scalingLevel << 6) & 0xC0) | _opOutputTable[resVol];
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setRegister(0x40 | _channelData.adlibReg2, resultOp);
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if (_channelData.instrumentData->feedBack & 1) {
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resVol = ((volume + 1) * (_channelData.instrumentData->totOutLev_Op1 + 1)) << 1;
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resVol &= 0xFFFF;
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resVol *= (_channelData.channelVolume + 1)<<1;
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resVol >>= 8;
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resVol *= (_musicVolume & 0xFF);
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resVol >>= 16;
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} else resVol = _channelData.instrumentData->totOutLev_Op1;
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resultOp = ((_channelData.instrumentData->scalingLevel << 2) & 0xC0) | _opOutputTable[resVol];
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setRegister(0x40 | _channelData.adlibReg1, resultOp);
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}
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void AdlibChannel::adlibSetupInstrument(void) {
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setRegister(0x60 | _channelData.adlibReg1, _channelData.instrumentData->ad_Op1);
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setRegister(0x60 | _channelData.adlibReg2, _channelData.instrumentData->ad_Op2);
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setRegister(0x80 | _channelData.adlibReg1, _channelData.instrumentData->sr_Op1);
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setRegister(0x80 | _channelData.adlibReg2, _channelData.instrumentData->sr_Op2);
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setRegister(0xE0 | _channelData.adlibReg1, _channelData.instrumentData->waveSelect_Op1);
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setRegister(0xE0 | _channelData.adlibReg2, _channelData.instrumentData->waveSelect_Op2);
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setRegister(0xC0 | _channelData.adlibChannelNumber, _channelData.instrumentData->feedBack);
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setRegister(0x20 | _channelData.adlibReg1, _channelData.instrumentData->ampMod_Op1);
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setRegister(0x20 | _channelData.adlibReg2, _channelData.instrumentData->ampMod_Op2);
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}
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#ifdef SCUMM_BIG_ENDIAN
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#define ENDIAN16(x) ((x >> 8) | ((x & 0xFF) << 8))
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#else
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#define ENDIAN16(x) (x)
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#endif
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uint16 AdlibChannel::getNextNote(uint8 param) {
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int16 freqIndex = ((int16)_channelData.freqOffset) - 0x40;
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if (freqIndex >= 0x3F) freqIndex++;
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freqIndex *= _channelData.freqDataSize;
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freqIndex += param<<6;
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uint16 freqData = ENDIAN16(_frequenceTable[freqIndex % 0x300]);
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if ((freqIndex%0x300 >= 0x1C0) || (freqIndex/0x300 > 0)) {
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return (((freqIndex / 0x300) - 1) << 10) + (freqData & 0x7FF);
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} else {
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// looks like a bug. dunno why. It's what the ASM code says.
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return (uint16)(((int16)freqData) >> 1);
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}
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}
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//- command 90h routines
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void AdlibChannel::com90_caseNoteOff(void) {
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if (_musicData[_channelData.eventDataPtr] == _channelData.lastCommand)
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stopNote();
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_channelData.eventDataPtr++;
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}
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void AdlibChannel::com90_stopChannel(void) {
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stopNote();
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_channelData.channelActive = 0;
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}
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void AdlibChannel::com90_setupInstrument(void) {
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_channelData.channelVolume = 0x7F;
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_channelData.freqOffset = 0x40;
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_channelData.assignedInstrument = _musicData[_channelData.eventDataPtr];
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_channelData.eventDataPtr++;
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_channelData.instrumentData = _instruments + _channelData.assignedInstrument;
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adlibSetupInstrument();
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}
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uint8 AdlibChannel::com90_updateTempo(void) {
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uint8 retV = _musicData[_channelData.eventDataPtr];
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_channelData.eventDataPtr++;
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return retV;
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}
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void AdlibChannel::com90_getFreqOffset(void) {
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_channelData.freqOffset = _musicData[_channelData.eventDataPtr];
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_channelData.eventDataPtr++;
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if (_channelData.note & 0x20) {
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uint16 nextNote = getNextNote(
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_channelData.lastCommand - 0x18 + _channelData.instrumentData->bindedEffect);
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setRegister(0xA0 | _channelData.adlibChannelNumber, (uint8)nextNote);
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setRegister(0xB0 | _channelData.adlibChannelNumber, (uint8)((nextNote >> 8) | 0x20));
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_channelData.note = (uint8)(nextNote >> 8) | 0x20;
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}
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}
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void AdlibChannel::com90_getChannelVolume(void) {
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_channelData.channelVolume = _musicData[_channelData.eventDataPtr];
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_channelData.eventDataPtr++;
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}
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void AdlibChannel::com90_getTremoVibro(void) {
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_channelData.tremoVibro = _musicData[_channelData.eventDataPtr];
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_channelData.eventDataPtr++;
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}
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void AdlibChannel::com90_rewindMusic(void) {
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_channelData.eventDataPtr = _channelData.startOfData;
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}
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void AdlibChannel::com90_keyOff(void) {
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stopNote();
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}
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void AdlibChannel::com90_setStartOfData(void) {
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_channelData.startOfData = _channelData.eventDataPtr;
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}
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} // End of namespace Sky
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