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498 lines
13 KiB
C++
498 lines
13 KiB
C++
//-----------------------------------------------------------------------------
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//
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// Copyright 2002-2016 Randy Heit
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// Copyright 2005-2014 Simon Howard
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// Copyright 2017 Christoph Oelckers
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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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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//
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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, see http://www.gnu.org/licenses/
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//
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//-----------------------------------------------------------------------------
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//
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// This is mostly a reimplementation of the interface provided by
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// MusLib based on Chocolate-Doom's OPL player, although the
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// interface has been cleaned up a bit to be more consistent and readable.
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//
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//
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#include <stdlib.h>
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#include <string.h>
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#include "musicblock.h"
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musicBlock::musicBlock ()
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{
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memset (this, 0, sizeof(*this));
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for(auto &oplchannel : oplchannels) oplchannel.Panning = 64; // default to center panning.
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for(auto &voice : voices) voice.index = ~0u; // mark all free.
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}
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musicBlock::~musicBlock ()
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{
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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int musicBlock::releaseVoice(uint32_t slot, uint32_t killed)
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{
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struct OPLVoice *ch = &voices[slot];
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io->WriteFrequency(slot, ch->note, ch->pitch, 0);
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ch->index = ~0u;
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ch->sustained = false;
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if (!killed) ch->timestamp = ++timeCounter;
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if (killed) io->MuteChannel(slot);
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return slot;
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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int musicBlock::findFreeVoice()
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{
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// We want to prefer the least recently freed voice, as more recently
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// freed voices can still play a tone from their release state.
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// Sustained voices are replaced when there are no free voices.
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uint32_t min_value = ~0u;
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int result = -1;
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for (uint32_t i = 0; i < io->NumChannels; ++i)
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{
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uint32_t voice_value = voices[i].timestamp + (voices[i].sustained ? (1 << 31) : 0);
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if ((voices[i].index == ~0u || voices[i].sustained) && (voice_value < min_value))
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{
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min_value = voice_value;
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result = i;
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}
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}
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if (result >= 0)
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{
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releaseVoice(result, 1);
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}
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return result;
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}
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//----------------------------------------------------------------------------
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//
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// When all voices are in use, we must discard an existing voice to
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// play a new note. Find and free an existing voice. The channel
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// passed to the function is the channel for the new note to be
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// played.
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//
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//----------------------------------------------------------------------------
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int musicBlock::replaceExistingVoice()
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{
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// Check the allocated voices, if we find an instrument that is
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// of a lower priority to the new instrument, discard it.
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// If a voice is being used to play the second voice of an instrument,
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// use that, as second voices are non-essential.
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// Lower numbered MIDI channels implicitly have a higher priority
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// than higher-numbered channels, eg. MIDI channel 1 is never
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// discarded for MIDI channel 2.
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int result = 0;
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for (uint32_t i = 0; i < io->NumChannels; ++i)
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{
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if (voices[i].current_instr_voice == &voices[i].current_instr->voices[1] ||
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voices[i].index >= voices[result].index)
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{
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result = i;
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}
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}
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releaseVoice(result, 1);
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return result;
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::voiceKeyOn(uint32_t slot, uint32_t channo, GenMidiInstrument *instrument, uint32_t instrument_voice, uint32_t key, uint32_t volume)
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{
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struct OPLVoice *voice = &voices[slot];
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auto &channel = oplchannels[channo];
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GenMidiVoice *gmvoice;
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voice->index = channo;
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voice->key = key;
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// Program the voice with the instrument data:
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voice->current_instr = instrument;
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gmvoice = voice->current_instr_voice = &instrument->voices[instrument_voice];
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io->WriteInstrument(slot,gmvoice, channel.Vibrato);
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io->WritePan(slot, gmvoice, channel.Panning);
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// Set the volume level.
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voice->note_volume = volume;
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io->WriteVolume(slot, gmvoice, channel.Volume, channel.Expression, volume);
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// Write the frequency value to turn the note on.
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// Work out the note to use. This is normally the same as
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// the key, unless it is a fixed pitch instrument.
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int note;
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if (instrument->flags & GENMIDI_FLAG_FIXED) note = instrument->fixed_note;
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else if (channo == CHAN_PERCUSSION) note = 60;
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else note = key;
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// If this is the second voice of a double voice instrument, the
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// frequency index can be adjusted by the fine tuning field.
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voice->fine_tuning = (instrument_voice != 0) ? (voice->current_instr->fine_tuning / 2) - 64 : 0;
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voice->pitch = voice->fine_tuning + channel.Pitch;
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if (!(instrument->flags & GENMIDI_FLAG_FIXED) && channo != CHAN_PERCUSSION)
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{
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note += gmvoice->base_note_offset;
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}
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// Avoid possible overflow due to base note offset:
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while (note < 0)
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{
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note += 12;
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}
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while (note > HIGHEST_NOTE)
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{
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note -= 12;
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}
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voice->note = note;
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io->WriteFrequency(slot, note, voice->pitch, 1);
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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bool opl_singlevoice;
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void musicBlock::noteOn(uint32_t channel, uint8_t key, int volume)
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{
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if (volume <= 0)
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{
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noteOff(channel, key);
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return;
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}
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GenMidiInstrument *instrument;
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// Percussion channel is treated differently.
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if (channel == CHAN_PERCUSSION)
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{
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if (key < GENMIDI_FIST_PERCUSSION || key >= GENMIDI_FIST_PERCUSSION + GENMIDI_NUM_PERCUSSION)
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{
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return;
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}
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instrument = &OPLinstruments[key + (GENMIDI_NUM_INSTRS - GENMIDI_FIST_PERCUSSION)];
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}
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else
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{
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auto inst = oplchannels[channel].Instrument;
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if (inst >= GENMIDI_NUM_TOTAL) return; // better safe than sorry.
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instrument = &OPLinstruments[inst];
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}
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bool double_voice = ((instrument->flags) & GENMIDI_FLAG_2VOICE) && !opl_singlevoice;
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int i = findFreeVoice();
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if (i < 0) i = replaceExistingVoice();
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if (i >= 0)
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{
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voiceKeyOn(i, channel, instrument, 0, key, volume);
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if (double_voice)
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{
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i = findFreeVoice();
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if (i >= 0)
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{
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voiceKeyOn(i, channel, instrument, 1, key, volume);
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}
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::noteOff(uint32_t id, uint8_t note)
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{
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uint32_t sustain = oplchannels[id].Sustain;
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for(uint32_t i = 0; i < io->NumChannels; i++)
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{
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if (voices[i].index == id && voices[i].key == note)
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{
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if (sustain >= MIN_SUSTAIN)
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{
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voices[i].sustained = true;
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voices[i].timestamp = ++timeCounter;
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}
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else releaseVoice(i, 0);
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::changePitch(uint32_t id, int val1, int val2)
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{
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// Convert pitch from 14-bit to 7-bit, then scale it, since the player
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// code only understands sensitivities of 2 semitones.
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int pitch = ((val1 | (val2 << 7)) - 8192) * oplchannels[id].PitchSensitivity / (200 * 128) + 64;
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oplchannels[id].Pitch = pitch;
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for(uint32_t i = 0; i < io->NumChannels; i++)
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{
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auto &ch = voices[i];
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if (ch.index == id)
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{
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ch.pitch = ch.fine_tuning + pitch;
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io->WriteFrequency(i, ch.note, ch.pitch, 1);
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::changeModulation(uint32_t id, int value)
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{
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bool vibrato = (value >= VIBRATO_THRESHOLD);
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oplchannels[id].Vibrato = vibrato;
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for (uint32_t i = 0; i < io->NumChannels; i++)
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{
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auto &ch = voices[i];
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if (ch.index == id)
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{
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io->WriteTremolo(i, ch.current_instr_voice, vibrato);
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::changeSustain(uint32_t id, int value)
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{
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oplchannels[id].Sustain = value;
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if (value < MIN_SUSTAIN)
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{
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for (uint32_t i = 0; i < io->NumChannels; i++)
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{
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if (voices[i].index == id && voices[i].sustained)
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releaseVoice(i, 0);
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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// Change volume or expression.
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// Since both go to the same register, one function can handle both.
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//
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//----------------------------------------------------------------------------
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void musicBlock::changeVolume(uint32_t id, int value, bool expression)
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{
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auto &chan = oplchannels[id];
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if (!expression) chan.Volume = value;
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else chan.Expression = value;
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for (uint32_t i = 0; i < io->NumChannels; i++)
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{
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auto &ch = voices[i];
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if (ch.index == id)
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{
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io->WriteVolume(i, ch.current_instr_voice, chan.Volume, chan.Expression, ch.note_volume);
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::changePanning(uint32_t id, int value)
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{
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oplchannels[id].Panning = value;
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for(uint32_t i = 0; i < io->NumChannels; i++)
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{
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auto &ch = voices[i];
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if (ch.index == id)
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{
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io->WritePan(i, ch.current_instr_voice, value);
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::notesOff(uint32_t id, int value)
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{
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for (uint32_t i = 0; i < io->NumChannels; ++i)
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{
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if (voices[i].index == id)
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{
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if (oplchannels[id].Sustain >= MIN_SUSTAIN)
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{
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voices[i].sustained = true;
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voices[i].timestamp = ++timeCounter;
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}
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else releaseVoice(i, 0);
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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// release all notes for this channel
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//
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//----------------------------------------------------------------------------
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void musicBlock::allNotesOff(uint32_t id, int value)
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{
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for (uint32_t i = 0; i < io->NumChannels; ++i)
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{
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if (voices[i].index == id)
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{
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releaseVoice(i, 0);
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}
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::changeExtended(uint32_t id, uint8_t controller, int value)
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{
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switch (controller)
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{
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case ctrlRPNHi:
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oplchannels[id].RPN = (oplchannels[id].RPN & 0x007F) | (value << 7);
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break;
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case ctrlRPNLo:
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oplchannels[id].RPN = (oplchannels[id].RPN & 0x3F80) | value;
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break;
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case ctrlNRPNLo:
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case ctrlNRPNHi:
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oplchannels[id].RPN = 0x3FFF;
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break;
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case ctrlDataEntryHi:
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if (oplchannels[id].RPN == 0)
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{
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oplchannels[id].PitchSensitivity = value * 100 + (oplchannels[id].PitchSensitivity % 100);
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}
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break;
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case ctrlDataEntryLo:
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if (oplchannels[id].RPN == 0)
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{
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oplchannels[id].PitchSensitivity = value + (oplchannels[id].PitchSensitivity / 100) * 100;
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}
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break;
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::resetControllers(uint32_t chan, int vol)
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{
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auto &channel = oplchannels[chan];
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channel.Volume = vol;
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channel.Expression = 127;
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channel.Sustain = 0;
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channel.Pitch = 64;
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channel.RPN = 0x3fff;
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channel.PitchSensitivity = 200;
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::programChange(uint32_t channel, int value)
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{
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oplchannels[channel].Instrument = value;
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::resetAllControllers(int vol)
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{
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uint32_t i;
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for (i = 0; i < NUM_CHANNELS; i++)
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{
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resetControllers(i, vol);
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}
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}
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//----------------------------------------------------------------------------
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//
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//
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//
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//----------------------------------------------------------------------------
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void musicBlock::stopAllVoices()
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{
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for (uint32_t i = 0; i < io->NumChannels; i++)
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{
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if (voices[i].index != ~0u) releaseVoice(i, 1);
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voices[i].timestamp = 0;
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}
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timeCounter = 0;
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}
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