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Diffstat (limited to 'engines/scumm/player_ad.cpp')
| -rw-r--r-- | engines/scumm/player_ad.cpp | 959 |
1 files changed, 959 insertions, 0 deletions
diff --git a/engines/scumm/player_ad.cpp b/engines/scumm/player_ad.cpp new file mode 100644 index 0000000000..ed368afbf6 --- /dev/null +++ b/engines/scumm/player_ad.cpp @@ -0,0 +1,959 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +#include "scumm/player_ad.h" +#include "scumm/imuse/imuse.h" +#include "scumm/scumm.h" +#include "scumm/resource.h" + +#include "audio/fmopl.h" + +#include "common/textconsole.h" +#include "common/config-manager.h" + +namespace Scumm { + +#define AD_CALLBACK_FREQUENCY 472 + +Player_AD::Player_AD(ScummEngine *scumm, Audio::Mixer *mixer) + : _vm(scumm), _mixer(mixer), _rate(mixer->getOutputRate()) { + _opl2 = OPL::Config::create(); + if (!_opl2->init(_rate)) { + error("Could not initialize OPL2 emulator"); + } + + _samplesPerCallback = _rate / AD_CALLBACK_FREQUENCY; + _samplesPerCallbackRemainder = _rate % AD_CALLBACK_FREQUENCY; + _samplesTillCallback = 0; + _samplesTillCallbackRemainder = 0; + + memset(_registerBackUpTable, 0, sizeof(_registerBackUpTable)); + writeReg(0x01, 0x00); + writeReg(0xBD, 0x00); + writeReg(0x08, 0x00); + writeReg(0x01, 0x20); + + _mixer->playStream(Audio::Mixer::kPlainSoundType, &_soundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true); + + _engineMusicTimer = 0; + _soundPlaying = -1; + + _curOffset = 0; + + _sfxTimer = 4; + _rndSeed = 1; + + memset(_channels, 0, sizeof(_channels)); + memset(_sfxResource, 0, sizeof(_sfxResource)); + memset(_sfxPriority, 0, sizeof(_sfxPriority)); +} + +Player_AD::~Player_AD() { + _mixer->stopHandle(_soundHandle); + + stopAllSounds(); + Common::StackLock lock(_mutex); + delete _opl2; + _opl2 = 0; +} + +void Player_AD::setMusicVolume(int vol) { + // HACK: We ignore the parameter and set up the volume specified in the + // config manager. This allows us to differentiate between music and sfx + // volume changes. + setupVolume(); +} + +void Player_AD::startSound(int sound) { + Common::StackLock lock(_mutex); + + // Query the sound resource + const byte *res = _vm->getResourceAddress(rtSound, sound); + + if (res[2] == 0x80) { + // Stop the current sounds + stopAllSounds(); + + // Lock the new music resource + _soundPlaying = sound; + _vm->_res->lock(rtSound, _soundPlaying); + + // Start the new music resource + _resource = res; + startMusic(); + } else { + // Only try to start a sfx when no music is playing. + if (_soundPlaying == -1) { + const byte priority = res[0]; + const byte channel = res[1]; + + // Check for out of bounds access + if (channel >= 3) { + warning("AdLib sfx resource %d uses channel %d", sound, channel); + return; + } + + // Check whether the channel is free or the priority of the new + // sfx resource is above the old one. + if (_channels[channel * 3 + 0].state + || _channels[channel * 3 + 1].state + || _channels[channel * 3 + 2].state) { + if (_sfxPriority[channel] > priority) { + return; + } + } + + // Lock the new resource + _sfxResource[channel] = sound; + _sfxPriority[channel] = priority; + _vm->_res->lock(rtSound, sound); + + // Start the actual sfx resource + _resource = res; + startSfx(); + } + } + + // Setup the sound volume + setupVolume(); +} + +void Player_AD::stopSound(int sound) { + Common::StackLock lock(_mutex); + + if (sound == _soundPlaying) { + stopAllSounds(); + } else { + for (int i = 0; i < 3; ++i) { + if (_sfxResource[i] == sound) { + if (_channels[i * 3 + 0].state + || _channels[i * 3 + 1].state + || _channels[i * 3 + 2].state) { + // Unlock the sound resource + _vm->_res->unlock(rtSound, sound); + + // Stop the actual sfx playback + _channels[i * 3 + 0].state = 0; + _channels[i * 3 + 1].state = 0; + _channels[i * 3 + 2].state = 0; + clearChannel(i * 3 + 0); + clearChannel(i * 3 + 1); + clearChannel(i * 3 + 2); + } + } + } + } +} + +void Player_AD::stopAllSounds() { + Common::StackLock lock(_mutex); + + // Unlock the music resource if present + if (_soundPlaying != -1) { + _vm->_res->unlock(rtSound, _soundPlaying); + _soundPlaying = -1; + } + + // Stop the music playback + _curOffset = 0; + + // Unloack all used sfx resources + for (int i = 0; i < 3; ++i) { + if (_channels[i * 3 + 0].state || _channels[i * 3 + 1].state || _channels[i * 3 + 2].state) { + _vm->_res->unlock(rtSound, _sfxResource[i]); + } + } + + // Reset all the sfx channels + for (int i = 0; i < 9; ++i) { + _channels[i].state = 0; + clearChannel(i); + } + + writeReg(0xBD, 0x00); +} + +int Player_AD::getMusicTimer() { + return _engineMusicTimer; +} + +int Player_AD::getSoundStatus(int sound) const { + return (sound == _soundPlaying); +} + +void Player_AD::saveLoadWithSerializer(Serializer *ser) { + Common::StackLock lock(_mutex); + + if (ser->getVersion() < VER(95)) { + IMuse *dummyImuse = IMuse::create(_vm->_system, NULL, NULL); + dummyImuse->save_or_load(ser, _vm, false); + delete dummyImuse; + return; + } + + // TODO: Be nicer than the original and save the data to continue the + // currently played sound resources on load? +} + +int Player_AD::readBuffer(int16 *buffer, const int numSamples) { + Common::StackLock lock(_mutex); + + int len = numSamples; + + while (len > 0) { + if (!_samplesTillCallback) { + // Run the update callback for music or sfx depending on which is + // active. + if (_curOffset) { + updateMusic(); + } else { + updateSfx(); + } + + _samplesTillCallback = _samplesPerCallback; + _samplesTillCallbackRemainder += _samplesPerCallbackRemainder; + if (_samplesTillCallbackRemainder >= AD_CALLBACK_FREQUENCY) { + ++_samplesTillCallback; + _samplesTillCallbackRemainder -= AD_CALLBACK_FREQUENCY; + } + } + + const int samplesToRead = MIN(len, _samplesTillCallback); + _opl2->readBuffer(buffer, samplesToRead); + + buffer += samplesToRead; + len -= samplesToRead; + _samplesTillCallback -= samplesToRead; + } + + return numSamples; +} + +void Player_AD::setupVolume() { + // Setup the correct volume + int soundVolumeMusic = CLIP<int>(ConfMan.getInt("music_volume"), 0, Audio::Mixer::kMaxChannelVolume); + int soundVolumeSfx = CLIP<int>(ConfMan.getInt("sfx_volume"), 0, Audio::Mixer::kMaxChannelVolume); + if (ConfMan.hasKey("mute")) { + if (ConfMan.getBool("mute")) { + soundVolumeMusic = 0; + soundVolumeSfx = 0; + } + } + + // In case a music is being played set the music volume. Set the sfx + // volume otherwise. This is safe because in the latter case either + // sfx are playing or there is no sound being played at all. + if (_soundPlaying != -1) { + _mixer->setChannelVolume(_soundHandle, soundVolumeMusic); + } else { + _mixer->setChannelVolume(_soundHandle, soundVolumeSfx); + } +} + +void Player_AD::writeReg(int r, int v) { + if (r >= 0 && r < ARRAYSIZE(_registerBackUpTable)) { + _registerBackUpTable[r] = v; + } + _opl2->writeReg(r, v); +} + +uint8 Player_AD::readReg(int r) const { + if (r >= 0 && r < ARRAYSIZE(_registerBackUpTable)) { + return _registerBackUpTable[r]; + } else { + return 0; + } +} + +void Player_AD::setupChannel(const uint channel, const byte *instrOffset) { + instrOffset += 2; + writeReg(0xC0 + channel, *instrOffset++); + setupOperator(_operatorOffsetTable[channel * 2 + 0], instrOffset); + setupOperator(_operatorOffsetTable[channel * 2 + 1], instrOffset); +} + +void Player_AD::setupOperator(const uint opr, const byte *&instrOffset) { + writeReg(0x20 + opr, *instrOffset++); + writeReg(0x40 + opr, *instrOffset++); + writeReg(0x60 + opr, *instrOffset++); + writeReg(0x80 + opr, *instrOffset++); + writeReg(0xE0 + opr, *instrOffset++); +} + +const int Player_AD::_operatorOffsetTable[18] = { + 0, 3, 1, 4, + 2, 5, 8, 11, + 9, 12, 10, 13, + 16, 19, 17, 20, + 18, 21 +}; + +// Music + +void Player_AD::startMusic() { + memset(_instrumentOffset, 0, sizeof(_instrumentOffset)); + memset(_channelLastEvent, 0, sizeof(_channelLastEvent)); + memset(_channelFrequency, 0, sizeof(_channelFrequency)); + memset(_channelB0Reg, 0, sizeof(_channelB0Reg)); + + _voiceChannels = 0; + uint instruments = _resource[10]; + for (uint i = 0; i < instruments; ++i) { + const int instrIndex = _resource[11 + i] - 1; + if (0 <= instrIndex && instrIndex < 16) { + _instrumentOffset[instrIndex] = i * 16 + 16 + 3; + _voiceChannels |= _resource[_instrumentOffset[instrIndex] + 13]; + } + } + + if (_voiceChannels) { + _mdvdrState = 0x20; + _voiceChannels = 6; + } else { + _mdvdrState = 0; + _voiceChannels = 9; + } + + _curOffset = 0x93; + // TODO: is this the same for Loom? + _nextEventTimer = 40; + _engineMusicTimer = 0; + _internalMusicTimer = 0; + _musicTimer = 0; + + writeReg(0xBD, _mdvdrState); + + const bool isLoom = (_vm->_game.id == GID_LOOM); + _timerLimit = isLoom ? 473 : 256; + _musicTicks = _resource[3] * (isLoom ? 2 : 1); + _loopFlag = (_resource[4] == 0); + _musicLoopStart = READ_LE_UINT16(_resource + 5); +} + +void Player_AD::updateMusic() { + _musicTimer += _musicTicks; + if (_musicTimer < _timerLimit) { + return; + } + _musicTimer -= _timerLimit; + + ++_internalMusicTimer; + if (_internalMusicTimer > 120) { + _internalMusicTimer = 0; + ++_engineMusicTimer; + } + + --_nextEventTimer; + if (_nextEventTimer) { + return; + } + + while (true) { + uint command = _resource[_curOffset++]; + if (command == 0xFF) { + // META EVENT + // Get the command number. + command = _resource[_curOffset++]; + if (command == 47) { + // End of track + if (_loopFlag) { + // In case the track is looping jump to the start. + _curOffset = _musicLoopStart; + _nextEventTimer = 0; + } else { + // Otherwise completely stop playback. + stopAllSounds(); + } + return; + } else if (command == 88) { + // This is proposedly a debug information insertion. The CMS + // player code handles this differently, but is still using + // the same resources... + _curOffset += 5; + } else if (command == 81) { + // Change tempo. This is used exclusively in Loom. + const uint timing = _resource[_curOffset + 2] | (_resource[_curOffset + 1] << 8); + _musicTicks = 0x73000 / timing; + command = _resource[_curOffset++]; + _curOffset += command; + } else { + // In case an unknown meta event occurs just skip over the + // data by using the length supplied. + command = _resource[_curOffset++]; + _curOffset += command; + } + } else { + if (command >= 0x90) { + // NOTE ON + // Extract the channel number and save it in command. + command -= 0x90; + + const uint instrOffset = _instrumentOffset[command]; + if (instrOffset) { + if (_resource[instrOffset + 13] != 0) { + setupRhythm(_resource[instrOffset + 13], instrOffset); + } else { + int channel = findFreeChannel(); + if (channel != -1) { + noteOff(channel); + setupChannel(channel, instrOffset); + _channelLastEvent[channel] = command + 0x90; + _channelFrequency[channel] = _resource[_curOffset]; + setupFrequency(channel, _resource[_curOffset]); + } + } + } + } else { + // NOTE OFF + const uint note = _resource[_curOffset]; + command += 0x10; + + // Find the output channel which plays the note. + uint channel = 0xFF; + for (uint i = 0; i < _voiceChannels; ++i) { + if (_channelFrequency[i] == note && _channelLastEvent[i] == command) { + channel = i; + break; + } + } + + if (channel != 0xFF) { + // In case a output channel playing the note was found, + // stop it. + noteOff(channel); + } else { + // In case there is no such note this will disable the + // rhythm instrument played on the channel. + command -= 0x90; + const uint instrOffset = _instrumentOffset[command]; + if (instrOffset && _resource[instrOffset + 13] != 0) { + const uint rhythmInstr = _resource[instrOffset + 13]; + if (rhythmInstr < 6) { + _mdvdrState &= _mdvdrTable[rhythmInstr] ^ 0xFF; + writeReg(0xBD, _mdvdrState); + } + } + } + } + + _curOffset += 2; + } + + // In case there is a delay till the next event stop handling. + if (_resource[_curOffset] != 0) { + break; + } + ++_curOffset; + } + + _nextEventTimer = _resource[_curOffset++]; + if (_nextEventTimer & 0x80) { + _nextEventTimer -= 0x80; + _nextEventTimer <<= 7; + _nextEventTimer |= _resource[_curOffset++]; + } + + _nextEventTimer >>= (_vm->_game.id == GID_LOOM) ? 2 : 1; + if (!_nextEventTimer) { + _nextEventTimer = 1; + } +} + +void Player_AD::noteOff(uint channel) { + _channelLastEvent[channel] = 0; + writeReg(0xB0 + channel, _channelB0Reg[channel] & 0xDF); +} + +int Player_AD::findFreeChannel() { + for (uint i = 0; i < _voiceChannels; ++i) { + if (!_channelLastEvent[i]) { + return i; + } + } + + return -1; +} + +void Player_AD::setupFrequency(uint channel, int8 frequency) { + frequency -= 31; + if (frequency < 0) { + frequency = 0; + } + + uint octave = 0; + while (frequency >= 12) { + frequency -= 12; + ++octave; + } + + const uint noteFrequency = _noteFrequencies[frequency]; + octave <<= 2; + octave |= noteFrequency >> 8; + octave |= 0x20; + writeReg(0xA0 + channel, noteFrequency & 0xFF); + _channelB0Reg[channel] = octave; + writeReg(0xB0 + channel, octave); +} + +void Player_AD::setupRhythm(uint rhythmInstr, uint instrOffset) { + if (rhythmInstr == 1) { + setupChannel(6, instrOffset); + writeReg(0xA6, _resource[instrOffset++]); + writeReg(0xB6, _resource[instrOffset] & 0xDF); + _mdvdrState |= 0x10; + writeReg(0xBD, _mdvdrState); + } else if (rhythmInstr < 6) { + const byte *secondOperatorOffset = _resource + instrOffset + 8; + setupOperator(_rhythmOperatorTable[rhythmInstr], secondOperatorOffset); + writeReg(0xA0 + _rhythmChannelTable[rhythmInstr], _resource[instrOffset++]); + writeReg(0xB0 + _rhythmChannelTable[rhythmInstr], _resource[instrOffset++] & 0xDF); + writeReg(0xC0 + _rhythmChannelTable[rhythmInstr], _resource[instrOffset]); + _mdvdrState |= _mdvdrTable[rhythmInstr]; + writeReg(0xBD, _mdvdrState); + } +} + +const uint Player_AD::_noteFrequencies[12] = { + 0x200, 0x21E, 0x23F, 0x261, + 0x285, 0x2AB, 0x2D4, 0x300, + 0x32E, 0x35E, 0x390, 0x3C7 +}; + +const uint Player_AD::_mdvdrTable[6] = { + 0x00, 0x10, 0x08, 0x04, 0x02, 0x01 +}; + +const uint Player_AD::_rhythmOperatorTable[6] = { + 0x00, 0x00, 0x14, 0x12, 0x15, 0x11 +}; + +const uint Player_AD::_rhythmChannelTable[6] = { + 0x00, 0x00, 0x07, 0x08, 0x08, 0x07 +}; + +// SFX + +void Player_AD::startSfx() { + writeReg(0xBD, 0x00); + + // The second byte of the resource defines the logical channel where + // the sound effect should be played. + const int startChannel = _resource[1] * 3; + + // Clear the channel. + _channels[startChannel + 0].state = 0; + _channels[startChannel + 1].state = 0; + _channels[startChannel + 2].state = 0; + + clearChannel(startChannel + 0); + clearChannel(startChannel + 1); + clearChannel(startChannel + 2); + + // Set up the first channel to pick up playback. + _channels[startChannel].currentOffset = _channels[startChannel].startOffset = _resource + 2; + _channels[startChannel].state = 1; + + // Scan for the start of the other channels and set them up if required. + int curChannel = startChannel + 1; + const byte *bufferPosition = _resource + 2; + uint8 command = 0; + while ((command = *bufferPosition) != 0xFF) { + switch (command) { + case 1: + // INSTRUMENT DEFINITION + bufferPosition += 15; + break; + + case 2: + // NOTE DEFINITION + bufferPosition += 11; + break; + + case 0x80: + // LOOP + bufferPosition += 1; + break; + + default: + // START OF CHANNEL + bufferPosition += 1; + _channels[curChannel].currentOffset = bufferPosition; + _channels[curChannel].startOffset = bufferPosition; + _channels[curChannel].state = 1; + ++curChannel; + break; + } + } +} + +void Player_AD::updateSfx() { + if (--_sfxTimer) { + return; + } + _sfxTimer = 4; + + for (int i = 0; i <= 9; ++i) { + if (!_channels[i].state) { + continue; + } + + updateChannel(i); + } +} + +void Player_AD::clearChannel(int channel) { + writeReg(0xA0 + channel, 0x00); + writeReg(0xB0 + channel, 0x00); +} + +void Player_AD::updateChannel(int channel) { + if (_channels[channel].state == 1) { + parseSlot(channel); + } else { + updateSlot(channel); + } +} + +void Player_AD::parseSlot(int channel) { + while (true) { + const byte *curOffset = _channels[channel].currentOffset; + + switch (*curOffset) { + case 1: + // INSTRUMENT DEFINITION + ++curOffset; + _channels[channel].instrumentData[0] = *(curOffset + 0); + _channels[channel].instrumentData[1] = *(curOffset + 2); + _channels[channel].instrumentData[2] = *(curOffset + 9); + _channels[channel].instrumentData[3] = *(curOffset + 8); + _channels[channel].instrumentData[4] = *(curOffset + 4); + _channels[channel].instrumentData[5] = *(curOffset + 3); + _channels[channel].instrumentData[6] = 0; + + setupChannel(channel, curOffset); + + writeReg(0xA0 + channel, *(curOffset + 0)); + writeReg(0xB0 + channel, *(curOffset + 1) & 0xDF); + + _channels[channel].currentOffset += 15; + break; + + case 2: + // NOTE DEFINITION + ++curOffset; + _channels[channel].state = 2; + noteOffOn(channel); + parseNote(channel, 0, curOffset); + parseNote(channel, 1, curOffset); + return; + + case 0x80: + // LOOP + _channels[channel].currentOffset = _channels[channel].startOffset; + break; + + default: + // START OF CHANNEL + // When we encounter a start of another channel while playback + // it means that the current channel is finished. Thus, we will + // stop it. + clearChannel(channel); + _channels[channel].state = 0; + + // If no channel of the sound effect is playing anymore, unlock + // the resource. + channel /= 3; + if (!_channels[channel + 0].state + && !_channels[channel + 1].state + && !_channels[channel + 2].state) { + _vm->_res->unlock(rtSound, _sfxResource[channel]); + } + return; + } + } +} + +void Player_AD::updateSlot(int channel) { + const byte *curOffset = _channels[channel].currentOffset + 1; + + for (int num = 0; num <= 1; ++num, curOffset += 5) { + if (!(*curOffset & 0x80)) { + continue; + } + + const int note = channel * 2 + num; + bool updateNote = false; + + if (_notes[note].state == 2) { + if (!--_notes[note].sustainTimer) { + updateNote = true; + } + } else { + updateNote = processNoteEnvelope(note, _notes[note].instrumentValue); + + if (_notes[note].bias) { + writeRegisterSpecial(note, _notes[note].bias - _notes[note].instrumentValue, *curOffset & 0x07); + } else { + writeRegisterSpecial(note, _notes[note].instrumentValue, *curOffset & 0x07); + } + } + + if (updateNote) { + if (processNote(note, curOffset)) { + if (!(*curOffset & 0x08)) { + _channels[channel].currentOffset += 11; + _channels[channel].state = 1; + continue; + } else if (*curOffset & 0x10) { + noteOffOn(channel); + } + + _notes[note].state = -1; + processNote(note, curOffset); + } + } + + if ((*curOffset & 0x20) && !--_notes[note].playTime) { + _channels[channel].currentOffset += 11; + _channels[channel].state = 1; + } + } +} + +void Player_AD::parseNote(int channel, int num, const byte *offset) { + if (num) { + offset += 5; + } + + if (*offset & 0x80) { + const int note = channel * 2 + num; + _notes[note].state = -1; + processNote(note, offset); + _notes[note].playTime = 0; + + if (*offset & 0x20) { + _notes[note].playTime = (*(offset + 4) >> 4) * 118; + _notes[note].playTime += (*(offset + 4) & 0x0F) * 8; + } + } +} + +bool Player_AD::processNote(int note, const byte *offset) { + if (++_notes[note].state == 4) { + return true; + } + + const int instrumentDataOffset = *offset & 0x07; + _notes[note].bias = _noteBiasTable[instrumentDataOffset]; + + uint8 instrumentDataValue = 0; + if (_notes[note].state == 0) { + instrumentDataValue = _channels[note / 2].instrumentData[instrumentDataOffset]; + } + + uint8 noteInstrumentValue = readRegisterSpecial(note, instrumentDataValue, instrumentDataOffset); + if (_notes[note].bias) { + noteInstrumentValue = _notes[note].bias - noteInstrumentValue; + } + _notes[note].instrumentValue = noteInstrumentValue; + + if (_notes[note].state == 2) { + _notes[note].sustainTimer = _numStepsTable[*(offset + 3) >> 4]; + + if (*offset & 0x40) { + _notes[note].sustainTimer = (((getRnd() << 8) * _notes[note].sustainTimer) >> 16) + 1; + } + } else { + int timer1, timer2; + if (_notes[note].state == 3) { + timer1 = *(offset + 3) & 0x0F; + timer2 = 0; + } else { + timer1 = *(offset + _notes[note].state + 1) >> 4; + timer2 = *(offset + _notes[note].state + 1) & 0x0F; + } + + int adjustValue = ((_noteAdjustTable[timer2] * _noteAdjustScaleTable[instrumentDataOffset]) >> 16) - noteInstrumentValue; + setupNoteEnvelopeState(note, _numStepsTable[timer1], adjustValue); + } + + return false; +} + +void Player_AD::noteOffOn(int channel) { + const uint8 regValue = readReg(0xB0 | channel); + writeReg(0xB0 | channel, regValue & 0xDF); + writeReg(0xB0 | channel, regValue | 0x20); +} + +void Player_AD::writeRegisterSpecial(int note, uint8 value, int offset) { + if (offset == 6) { + return; + } + + // Division by 2 extracts the channel number out of the note. + note /= 2; + + uint8 regNum; + if (_useOperatorTable[offset]) { + regNum = _operatorOffsetTable[_channelOperatorOffsetTable[offset] + note * 2]; + } else { + regNum = _channelOffsetTable[note]; + } + + regNum += _baseRegisterTable[offset]; + + uint8 regValue = readReg(regNum) & (~_registerMaskTable[offset]); + regValue |= value << _registerShiftTable[offset]; + + writeReg(regNum, regValue); +} + +uint8 Player_AD::readRegisterSpecial(int note, uint8 defaultValue, int offset) { + if (offset == 6) { + return 0; + } + + // Division by 2 extracts the channel number out of the note. + note /= 2; + + uint8 regNum; + if (_useOperatorTable[offset]) { + regNum = _operatorOffsetTable[_channelOperatorOffsetTable[offset] + note * 2]; + } else { + regNum = _channelOffsetTable[note]; + } + + regNum += _baseRegisterTable[offset]; + + uint8 regValue; + if (defaultValue) { + regValue = defaultValue; + } else { + regValue = readReg(regNum); + } + + regValue &= _registerMaskTable[offset]; + regValue >>= _registerShiftTable[offset]; + + return regValue; +} + +void Player_AD::setupNoteEnvelopeState(int note, int steps, int adjust) { + _notes[note].preIncrease = 0; + if (ABS(adjust) > steps) { + _notes[note].preIncrease = 1; + _notes[note].adjust = adjust / steps; + _notes[note].envelope.stepIncrease = ABS(adjust % steps); + } else { + _notes[note].adjust = adjust; + _notes[note].envelope.stepIncrease = ABS(adjust); + } + + _notes[note].envelope.step = steps; + _notes[note].envelope.stepCounter = 0; + _notes[note].envelope.timer = steps; +} + +bool Player_AD::processNoteEnvelope(int note, int &instrumentValue) { + if (_notes[note].preIncrease) { + instrumentValue += _notes[note].adjust; + } + + _notes[note].envelope.stepCounter += _notes[note].envelope.stepIncrease; + if (_notes[note].envelope.stepCounter >= _notes[note].envelope.step) { + _notes[note].envelope.stepCounter -= _notes[note].envelope.step; + + if (_notes[note].adjust < 0) { + --instrumentValue; + } else { + ++instrumentValue; + } + } + + if (--_notes[note].envelope.timer) { + return false; + } else { + return true; + } +} + +uint8 Player_AD::getRnd() { + if (_rndSeed & 1) { + _rndSeed >>= 1; + _rndSeed ^= 0xB8; + } else { + _rndSeed >>= 1; + } + + return _rndSeed; +} + +const uint Player_AD::_noteBiasTable[7] = { + 0x00, 0x00, 0x3F, 0x00, 0x3F, 0x00, 0x00 +}; + +const uint Player_AD::_numStepsTable[16] = { + 1, 4, 6, 8, + 10, 14, 18, 24, + 36, 64, 100, 160, + 240, 340, 600, 1200 +}; + +const uint Player_AD::_noteAdjustScaleTable[7] = { + 255, 7, 63, 15, 63, 15, 63 +}; + +const uint Player_AD::_noteAdjustTable[16] = { + 0, 4369, 8738, 13107, + 17476, 21845, 26214, 30583, + 34952, 39321, 43690, 48059, + 52428, 46797, 61166, 65535 +}; + +const bool Player_AD::_useOperatorTable[7] = { + false, false, true, true, true, true, false +}; + +const uint Player_AD::_channelOffsetTable[11] = { + 0, 1, 2, 3, + 4, 5, 6, 7, + 8, 8, 7 +}; + +const uint Player_AD::_channelOperatorOffsetTable[7] = { + 0, 0, 1, 1, 0, 0, 0 +}; + +const uint Player_AD::_baseRegisterTable[7] = { + 0xA0, 0xC0, 0x40, 0x20, 0x40, 0x20, 0x00 +}; + +const uint Player_AD::_registerMaskTable[7] = { + 0xFF, 0x0E, 0x3F, 0x0F, 0x3F, 0x0F, 0x00 +}; + +const uint Player_AD::_registerShiftTable[7] = { + 0, 1, 0, 0, 0, 0, 0 +}; + +} // End of namespace Scumm |