diff options
| -rw-r--r-- | engines/sci/sound/drivers/cms.cpp | 183 |
1 files changed, 182 insertions, 1 deletions
diff --git a/engines/sci/sound/drivers/cms.cpp b/engines/sci/sound/drivers/cms.cpp index b7b13550c0..cd7b101f03 100644 --- a/engines/sci/sound/drivers/cms.cpp +++ b/engines/sci/sound/drivers/cms.cpp @@ -33,6 +33,9 @@ namespace Sci { +// FIXME: We don't seem to be sending the polyphony init data, so disable this for now +#define CMS_DISABLE_VOICE_MAPPING + class MidiDriver_CMS : public MidiDriver_Emulated { public: MidiDriver_CMS(Audio::Mixer *mixer, ResourceManager *resMan) @@ -124,6 +127,12 @@ private: void controlChange(int channel, int control, int value); void pitchWheel(int channel, int value); + void voiceMapping(int channel, int value); + void bindVoices(int channel, int voices); + void unbindVoices(int channel, int voices); + void donateVoices(); + int findVoice(int channel); + int findVoiceBasic(int channel); void updateVoiceAmplitude(int voice); @@ -383,7 +392,11 @@ void MidiDriver_CMS::noteOn(int channel, int note, int velocity) { } } +#ifdef CMS_DISABLE_VOICE_MAPPING int voice = findVoiceBasic(channel); +#else + int voice = findVoice(channel); +#endif if (voice != -1) voiceOn(voice, note, velocity); } @@ -464,7 +477,9 @@ void MidiDriver_CMS::controlChange(int channel, int control, int value) { break; case 75: - //ChannelMapping +#ifndef CMS_DISABLE_VOICE_MAPPING + voiceMapping(channel, value); +#endif break; case 123: @@ -498,6 +513,172 @@ void MidiDriver_CMS::pitchWheel(int channelNr, int value) { } } +void MidiDriver_CMS::voiceMapping(int channelNr, int value) { + int curVoices = 0; + + for (uint i = 0; i < ARRAYSIZE(_voice); ++i) { + if (_voice[i].channel == channelNr) + ++curVoices; + } + + curVoices += _channel[channelNr].extraVoices; + + if (curVoices == value) { + return; + } else if (curVoices < value) { + bindVoices(channelNr, value - curVoices); + } else { + unbindVoices(channelNr, curVoices - value); + donateVoices(); + } +} + +void MidiDriver_CMS::bindVoices(int channel, int voices) { + for (uint i = 0; i < ARRAYSIZE(_voice); ++i) { + if (_voice[i].channel == 0xFF) + continue; + + Voice &voice = _voice[i]; + voice.channel = channel; + + if (voice.note != 0xFF) + voiceOff(i); + + --voices; + if (voices == 0) + break; + } + + _channel[channel].extraVoices += voices; + + // The original called "PatchChange" here, since this just + // copies the value of _channel[channel].patch to itself + // it is left out here though. +} + +void MidiDriver_CMS::unbindVoices(int channelNr, int voices) { + Channel &channel = _channel[channelNr]; + + if (channel.extraVoices >= voices) { + channel.extraVoices -= voices; + } else { + voices -= channel.extraVoices; + channel.extraVoices = 0; + + for (uint i = 0; i < ARRAYSIZE(_voice); ++i) { + if (_voice[i].channel == channelNr + && _voice[i].note == 0xFF) { + --voices; + if (voices == 0) + return; + } + } + + do { + uint16 voiceTime = 0; + uint voiceNr = 0; + + for (uint i = 0; i < ARRAYSIZE(_voice); ++i) { + if (_voice[i].channel != channelNr) + continue; + + uint16 curTime = _voice[i].turnOffTicks; + if (curTime) + curTime += 0x8000; + else + curTime = _voice[i].ticks; + + if (curTime >= voiceTime) { + voiceNr = i; + voiceTime = curTime; + } + } + + _voice[voiceNr].sustained = 0; + voiceOff(voiceNr); + _voice[voiceNr].channel = 0xFF; + --voices; + } while (voices != 0); + } +} + +void MidiDriver_CMS::donateVoices() { + int freeVoices = 0; + + for (uint i = 0; i < ARRAYSIZE(_voice); ++i) { + if (_voice[i].channel == 0xFF) + ++freeVoices; + } + + if (!freeVoices) + return; + + for (uint i = 0; i < ARRAYSIZE(_channel); ++i) { + Channel &channel = _channel[i]; + + if (!channel.extraVoices) { + continue; + } else if (channel.extraVoices < freeVoices) { + freeVoices -= channel.extraVoices; + channel.extraVoices = 0; + bindVoices(i, channel.extraVoices); + } else { + channel.extraVoices -= freeVoices; + bindVoices(i, freeVoices); + return; + } + } +} + +int MidiDriver_CMS::findVoice(int channelNr) { + Channel &channel = _channel[channelNr]; + int voiceNr = channel.lastVoiceUsed; + + int newVoice = 0; + uint16 newVoiceTime = 0; + + bool loopDone = false; + do { + ++voiceNr; + + if (voiceNr == 12) + voiceNr = 0; + + Voice &voice = _voice[voiceNr]; + + if (voiceNr == channel.lastVoiceUsed) + loopDone = true; + + if (voice.channel == channelNr) { + if (voice.note == 0xFF) { + channel.lastVoiceUsed = voiceNr; + return voiceNr; + } + + uint16 curTime = voice.turnOffTicks; + if (curTime) + curTime += 0x8000; + else + curTime = voice.ticks; + + if (curTime >= newVoiceTime) { + newVoice = voiceNr; + newVoiceTime = curTime; + } + } + } while (!loopDone); + + if (newVoiceTime > 0) { + voiceNr = newVoice; + _voice[voiceNr].sustained = 0; + voiceOff(voiceNr); + channel.lastVoiceUsed = voiceNr; + return voiceNr; + } else { + return -1; + } +} + void MidiDriver_CMS::updateVoiceAmplitude(int voiceNr) { Voice &voice = _voice[voiceNr]; |