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zmusic/source/mididevices/driver_adlib.cpp

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/*
Copyright (C) 1994-1995 Apogee Software, Ltd.
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.
*/
/**********************************************************************
module: AL_MIDI.C
author: James R. Dose
date: April 1, 1994
Low level routines to support General MIDI music on AdLib compatible
cards.
(c) Copyright 1994 James R. Dose. All Rights Reserved.
**********************************************************************/
#include "driver_adlib.h"
#include "_al_midi.h"
//#include "_multivc.h"
#include "../adlmidi/chips/nuked_opl3.h"
//#include "c_cvars.h"
/*
CUSTOM_CVAR(Bool, mus_al_stereo, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
{
AL_Stereo = self;
AL_SetStereo(AL_Stereo);
}
CVAR(Bool, mus_al_additivemode, false, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
*/
enum
{
AdLibErr_Warning = -2,
AdLibErr_Error = -1,
AdLibErr_Ok = 0,
};
static void AL_Shutdown(void);
static int ErrorCode;
int AdLibDrv_GetError(void) { return ErrorCode; }
const char *AdLibDrv_ErrorString(int const ErrorNumber)
{
const char *ErrorString;
switch( ErrorNumber )
{
case AdLibErr_Warning :
case AdLibErr_Error :
ErrorString = AdLibDrv_ErrorString( ErrorCode );
break;
case AdLibErr_Ok :
ErrorString = "AdLib ok.";
break;
default:
ErrorString = "Unknown AdLib error.";
break;
}
return ErrorString;
}
#if 0
int AdLibDrv_MIDI_Init(midifuncs * const funcs)
{
AdLibDrv_MIDI_Shutdown();
Bmemset(funcs, 0, sizeof(midifuncs));
funcs->NoteOff = AL_NoteOff;
funcs->NoteOn = AL_NoteOn;
funcs->PolyAftertouch = nullptr;
funcs->ControlChange = AL_ControlChange;
funcs->ProgramChange = AL_ProgramChange;
funcs->ChannelAftertouch = nullptr;
funcs->PitchBend = AL_SetPitchBend;
return AdLibErr_Ok;
}
#endif
//void AdLibDrv_MIDI_HaltPlayback(void) { MV_UnhookMusicRoutine(); }
void AdLibDrv_MIDI_Shutdown(void)
{
AdLibDrv_MIDI_HaltPlayback();
AL_Shutdown();
}
int AdLibDrv_MIDI_StartPlayback(void (*service)(void))
{
AdLibDrv_MIDI_HaltPlayback();
//AL_Init(MV_MixRate);
//MV_HookMusicRoutine(service);
return 0;// MIDI_Ok;
}
void AdLibDrv_MIDI_SetTempo(int const tempo, int const division)
{
//MV_MIDIRenderTempo = tempo * division / 60;
//MV_MIDIRenderTimer = 0;
}
static opl3_chip chip;
opl3_chip *AL_GetChip(void) { return &chip; }
static constexpr uint32_t OctavePitch[MAX_OCTAVE+1] = {
OCTAVE_0, OCTAVE_1, OCTAVE_2, OCTAVE_3, OCTAVE_4, OCTAVE_5, OCTAVE_6, OCTAVE_7,
};
static uint32_t NoteMod12[MAX_NOTE+1];
static uint32_t NoteDiv12[MAX_NOTE+1];
// Pitch table
//static unsigned NotePitch[ FINETUNE_MAX+1 ][ 12 ] =
// {
// { C, C_SHARP, D, D_SHARP, E, F, F_SHARP, G, G_SHARP, A, A_SHARP, B },
// };
static constexpr uint32_t NotePitch[FINETUNE_MAX+1][12] = {
{ 0x157, 0x16b, 0x181, 0x198, 0x1b0, 0x1ca, 0x1e5, 0x202, 0x220, 0x241, 0x263, 0x287 },
{ 0x157, 0x16b, 0x181, 0x198, 0x1b0, 0x1ca, 0x1e5, 0x202, 0x220, 0x242, 0x264, 0x288 },
{ 0x158, 0x16c, 0x182, 0x199, 0x1b1, 0x1cb, 0x1e6, 0x203, 0x221, 0x243, 0x265, 0x289 },
{ 0x158, 0x16c, 0x183, 0x19a, 0x1b2, 0x1cc, 0x1e7, 0x204, 0x222, 0x244, 0x266, 0x28a },
{ 0x159, 0x16d, 0x183, 0x19a, 0x1b3, 0x1cd, 0x1e8, 0x205, 0x223, 0x245, 0x267, 0x28b },
{ 0x15a, 0x16e, 0x184, 0x19b, 0x1b3, 0x1ce, 0x1e9, 0x206, 0x224, 0x246, 0x268, 0x28c },
{ 0x15a, 0x16e, 0x185, 0x19c, 0x1b4, 0x1ce, 0x1ea, 0x207, 0x225, 0x247, 0x269, 0x28e },
{ 0x15b, 0x16f, 0x185, 0x19d, 0x1b5, 0x1cf, 0x1eb, 0x208, 0x226, 0x248, 0x26a, 0x28f },
{ 0x15b, 0x170, 0x186, 0x19d, 0x1b6, 0x1d0, 0x1ec, 0x209, 0x227, 0x249, 0x26b, 0x290 },
{ 0x15c, 0x170, 0x187, 0x19e, 0x1b7, 0x1d1, 0x1ec, 0x20a, 0x228, 0x24a, 0x26d, 0x291 },
{ 0x15d, 0x171, 0x188, 0x19f, 0x1b7, 0x1d2, 0x1ed, 0x20b, 0x229, 0x24b, 0x26e, 0x292 },
{ 0x15d, 0x172, 0x188, 0x1a0, 0x1b8, 0x1d3, 0x1ee, 0x20c, 0x22a, 0x24c, 0x26f, 0x293 },
{ 0x15e, 0x172, 0x189, 0x1a0, 0x1b9, 0x1d4, 0x1ef, 0x20d, 0x22b, 0x24d, 0x270, 0x295 },
{ 0x15f, 0x173, 0x18a, 0x1a1, 0x1ba, 0x1d4, 0x1f0, 0x20e, 0x22c, 0x24e, 0x271, 0x296 },
{ 0x15f, 0x174, 0x18a, 0x1a2, 0x1bb, 0x1d5, 0x1f1, 0x20f, 0x22d, 0x24f, 0x272, 0x297 },
{ 0x160, 0x174, 0x18b, 0x1a3, 0x1bb, 0x1d6, 0x1f2, 0x210, 0x22e, 0x250, 0x273, 0x298 },
{ 0x161, 0x175, 0x18c, 0x1a3, 0x1bc, 0x1d7, 0x1f3, 0x211, 0x22f, 0x251, 0x274, 0x299 },
{ 0x161, 0x176, 0x18c, 0x1a4, 0x1bd, 0x1d8, 0x1f4, 0x212, 0x230, 0x252, 0x276, 0x29b },
{ 0x162, 0x176, 0x18d, 0x1a5, 0x1be, 0x1d9, 0x1f5, 0x212, 0x231, 0x254, 0x277, 0x29c },
{ 0x162, 0x177, 0x18e, 0x1a6, 0x1bf, 0x1d9, 0x1f5, 0x213, 0x232, 0x255, 0x278, 0x29d },
{ 0x163, 0x178, 0x18f, 0x1a6, 0x1bf, 0x1da, 0x1f6, 0x214, 0x233, 0x256, 0x279, 0x29e },
{ 0x164, 0x179, 0x18f, 0x1a7, 0x1c0, 0x1db, 0x1f7, 0x215, 0x235, 0x257, 0x27a, 0x29f },
{ 0x164, 0x179, 0x190, 0x1a8, 0x1c1, 0x1dc, 0x1f8, 0x216, 0x236, 0x258, 0x27b, 0x2a1 },
{ 0x165, 0x17a, 0x191, 0x1a9, 0x1c2, 0x1dd, 0x1f9, 0x217, 0x237, 0x259, 0x27c, 0x2a2 },
{ 0x166, 0x17b, 0x192, 0x1aa, 0x1c3, 0x1de, 0x1fa, 0x218, 0x238, 0x25a, 0x27e, 0x2a3 },
{ 0x166, 0x17b, 0x192, 0x1aa, 0x1c3, 0x1df, 0x1fb, 0x219, 0x239, 0x25b, 0x27f, 0x2a4 },
{ 0x167, 0x17c, 0x193, 0x1ab, 0x1c4, 0x1e0, 0x1fc, 0x21a, 0x23a, 0x25c, 0x280, 0x2a6 },
{ 0x168, 0x17d, 0x194, 0x1ac, 0x1c5, 0x1e0, 0x1fd, 0x21b, 0x23b, 0x25d, 0x281, 0x2a7 },
{ 0x168, 0x17d, 0x194, 0x1ad, 0x1c6, 0x1e1, 0x1fe, 0x21c, 0x23c, 0x25e, 0x282, 0x2a8 },
{ 0x169, 0x17e, 0x195, 0x1ad, 0x1c7, 0x1e2, 0x1ff, 0x21d, 0x23d, 0x260, 0x283, 0x2a9 },
{ 0x16a, 0x17f, 0x196, 0x1ae, 0x1c8, 0x1e3, 0x1ff, 0x21e, 0x23e, 0x261, 0x284, 0x2ab },
{ 0x16a, 0x17f, 0x197, 0x1af, 0x1c8, 0x1e4, 0x200, 0x21f, 0x23f, 0x262, 0x286, 0x2ac }
};
// Slot numbers as a function of the voice and the operator.
// ( melodic only)
static constexpr int slotVoice[NUMADLIBVOICES][2] = {
{ 0, 3 }, // voice 0
{ 1, 4 }, // 1
{ 2, 5 }, // 2
{ 6, 9 }, // 3
{ 7, 10 }, // 4
{ 8, 11 }, // 5
{ 12, 15 }, // 6
{ 13, 16 }, // 7
{ 14, 17 }, // 8
};
static int VoiceLevel[AL_NumChipSlots][2];
static int VoiceKsl[AL_NumChipSlots][2];
// This table gives the offset of each slot within the chip.
// offset = fn( slot)
static constexpr int8_t offsetSlot[AL_NumChipSlots] = { 0, 1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 16, 17, 18, 19, 20, 21 };
static int VoiceReserved[NUMADLIBVOICES * 2];
static AdLibVoice Voice[NUMADLIBVOICES * 2];
static AdLibVoiceList Voice_Pool;
static AdLibChannel Channel[NUMADLIBCHANNELS];
static int AL_LeftPort = ADLIB_PORT;
static int AL_RightPort = ADLIB_PORT;
int AL_Stereo = TRUE;
static int AL_MaxMidiChannel = 16;
// TODO: clean up this shit...
#define OFFSET(structure, offset) (*((char **)&(structure)[offset]))
#define LL_AddToTail(type, listhead, node) \
LL_AddNode((char *)(node), (char **)&((listhead)->end), (char **)&((listhead)->start), (intptr_t) & ((type *)0)->prev, \
(intptr_t) & ((type *)0)->next)
#define LL_Remove(type, listhead, node) \
LL_RemoveNode((char *)(node), (char **)&((listhead)->start), (char **)&((listhead)->end), (intptr_t) & ((type *)0)->next, \
(intptr_t) & ((type *)0)->prev)
static void LL_RemoveNode(char *item, char **head, char **tail, intptr_t next, intptr_t prev)
{
if (OFFSET(item, prev) == nullptr)
*head = OFFSET(item, next);
else
OFFSET(OFFSET(item, prev), next) = OFFSET(item, next);
if (OFFSET(item, next) == nullptr)
*tail = OFFSET(item, prev);
else
OFFSET(OFFSET(item, next), prev) = OFFSET(item, prev);
OFFSET(item, next) = nullptr;
OFFSET(item, prev) = nullptr;
}
static void LL_AddNode(char *item, char **head, char **tail, intptr_t next, intptr_t prev)
{
OFFSET(item, prev) = nullptr;
OFFSET(item, next) = *head;
if (*head)
OFFSET(*head, prev) = item;
else
*tail = item;
*head = item;
}
static void AL_SendOutputToPort(int const port, int const reg, int const data)
{
OPL3_WriteRegBuffered(&chip, (Bit16u)(reg + ((port & 2) << 7)), (Bit8u)data);
}
static void AL_SendOutput(int const voice, int const reg, int const data)
{
int port = (voice == 0) ? AL_RightPort : AL_LeftPort;
AL_SendOutputToPort(port, reg, data);
}
static void AL_SetVoiceTimbre(int const voice)
{
int const channel = Voice[voice].channel;
int const patch = (channel == 9) ? Voice[voice].key + 128 : Channel[channel].Timbre;
if (Voice[voice].timbre == patch)
return;
Voice[voice].timbre = patch;
auto const timbre = &ADLIB_TimbreBank[patch];
int const port = Voice[voice].port;
int const voc = (voice >= NUMADLIBVOICES) ? voice - NUMADLIBVOICES : voice;
int slot = slotVoice[voc][0];
int off = offsetSlot[slot];
VoiceLevel[slot][port] = 63 - (timbre->Level[0] & 0x3f);
VoiceKsl[slot][port] = timbre->Level[0] & 0xc0;
AL_SendOutput(port, 0xA0 + voc, 0);
AL_SendOutput(port, 0xB0 + voc, 0);
// Let voice clear the release
AL_SendOutput(port, 0x80 + off, 0xff);
AL_SendOutput(port, 0x60 + off, timbre->Env1[0]);
AL_SendOutput(port, 0x80 + off, timbre->Env2[0]);
AL_SendOutput(port, 0x20 + off, timbre->SAVEK[0]);
AL_SendOutput(port, 0xE0 + off, timbre->Wave[0]);
AL_SendOutput(port, 0x40 + off, timbre->Level[0]);
slot = slotVoice[voc][1];
AL_SendOutput(port, 0xC0 + voc, (timbre->Feedback & 0x0f) | 0x30);
off = offsetSlot[slot];
VoiceLevel[slot][port] = 63 - (timbre->Level[1] & 0x3f);
VoiceKsl[slot][port] = timbre->Level[1] & 0xc0;
AL_SendOutput(port, 0x40 + off, 63);
// Let voice clear the release
AL_SendOutput(port, 0x80 + off, 0xff);
AL_SendOutput(port, 0x60 + off, timbre->Env1[1]);
AL_SendOutput(port, 0x80 + off, timbre->Env2[1]);
AL_SendOutput(port, 0x20 + off, timbre->SAVEK[1]);
AL_SendOutput(port, 0xE0 + off, timbre->Wave[1]);
}
static void AL_SetVoiceVolume(int const voice)
{
int const channel = Voice[voice].channel;
auto const timbre = &ADLIB_TimbreBank[Voice[voice].timbre];
int const velocity = min<int>(Voice[voice].velocity + timbre->Velocity, MAX_VELOCITY);
int const voc = (voice >= NUMADLIBVOICES) ? voice - NUMADLIBVOICES : voice;
int const slot = slotVoice[voc][1];
int const port = Voice[voice].port;
// amplitude
auto t1 = (uint32_t)VoiceLevel[slot][port] * (velocity + 0x80);
t1 = (Channel[channel].Volume * t1) >> 15;
uint32_t volume = t1 ^ 63;
volume |= (uint32_t)VoiceKsl[slot][port];
AL_SendOutput(port, 0x40 + offsetSlot[slot], volume);
// Check if this timbre is Additive
if (timbre->Feedback & 0x01)
{
int const slot = slotVoice[voc][0];
uint32_t t2;
// amplitude
if (mus_al_additivemode)
t1 = (uint32_t)VoiceLevel[slot][port] * (velocity + 0x80);
t2 = (Channel[channel].Volume * t1) >> 15;
volume = t2 ^ 63;
volume |= (uint32_t)VoiceKsl[slot][port];
AL_SendOutput(port, 0x40 + offsetSlot[slot], volume);
}
}
static int AL_AllocVoice(void)
{
if (Voice_Pool.start)
{
int const voice = Voice_Pool.start->num;
LL_Remove(AdLibVoice, &Voice_Pool, &Voice[voice]);
return voice;
}
return AL_VoiceNotFound;
}
static int AL_GetVoice(int const channel, int const key)
{
auto const *voice = Channel[channel].Voices.start;
while (voice != nullptr)
{
if (voice->key == (uint32_t)key)
return voice->num;
voice = voice->next;
}
return AL_VoiceNotFound;
}
static void AL_SetVoicePitch(int const voice)
{
int const port = Voice[voice].port;
int const voc = (voice >= NUMADLIBVOICES) ? voice - NUMADLIBVOICES : voice;
int const channel = Voice[voice].channel;
int patch, note;
if (channel == 9)
{
patch = Voice[voice].key + 128;
note = ADLIB_TimbreBank[patch].Transpose;
}
else
{
patch = Channel[channel].Timbre;
note = Voice[voice].key + ADLIB_TimbreBank[patch].Transpose;
}
note += Channel[channel].KeyOffset - 12;
note = clamp(note, 0, MAX_NOTE);
int detune = Channel[channel].KeyDetune;
int ScaleNote = NoteMod12[note];
int Octave = NoteDiv12[note];
int pitch = OctavePitch[Octave] | NotePitch[detune][ScaleNote];
Voice[voice].pitchleft = pitch;
pitch |= Voice[voice].status;
AL_SendOutput(port, 0xA0 + voc, pitch);
AL_SendOutput(port, 0xB0 + voc, pitch >> 8);
}
static void AL_SetVoicePan(int const voice)
{
int const port = Voice[voice].port;
int const voc = (voice >= NUMADLIBVOICES) ? voice - NUMADLIBVOICES : voice;
int const channel = Voice[voice].channel;
if (AL_Stereo)
AL_SendOutput(port, 0xD0 + voc, Channel[channel].Pan << 1);
}
static void AL_SetChannelVolume(int const channel, int const volume)
{
Channel[channel].Volume = clamp(volume, 0, AL_MaxVolume);
auto voice = Channel[channel].Voices.start;
while (voice != nullptr)
{
AL_SetVoiceVolume(voice->num);
voice = voice->next;
}
}
static void AL_SetChannelPan(int const channel, int const pan)
{
// Don't pan drum sounds
if (channel != 9)
Channel[channel].Pan = pan;
auto voice = Channel[channel].Voices.start;
while (voice != nullptr)
{
AL_SetVoicePan(voice->num);
voice = voice->next;
}
}
static void AL_SetChannelDetune(int const channel, int const detune) { Channel[channel].Detune = detune; }
static void AL_ResetVoices(void)
{
Voice_Pool.start = nullptr;
Voice_Pool.end = nullptr;
int const numvoices = NUMADLIBVOICES * 2;
for (int index = 0; index < numvoices; index++)
{
if (VoiceReserved[index] == FALSE)
{
Voice[index].num = index;
Voice[index].key = 0;
Voice[index].velocity = 0;
Voice[index].channel = -1;
Voice[index].timbre = -1;
Voice[index].port = (index < NUMADLIBVOICES) ? 0 : 1;
Voice[index].status = NOTE_OFF;
LL_AddToTail(AdLibVoice, &Voice_Pool, &Voice[index]);
}
}
for (int index = 0; index < NUMADLIBCHANNELS; index++)
{
Channel[index] = {};
Channel[index].Volume = AL_DefaultChannelVolume;
Channel[index].Pan = 64;
Channel[index].PitchBendRange = AL_DefaultPitchBendRange;
Channel[index].PitchBendSemiTones = AL_DefaultPitchBendRange / 100;
Channel[index].PitchBendHundreds = AL_DefaultPitchBendRange % 100;
}
}
static void AL_CalcPitchInfo(void)
{
// int finetune;
// double detune;
for (int note = 0; note <= MAX_NOTE; note++)
{
NoteMod12[note] = note % 12;
NoteDiv12[note] = note / 12;
}
// for( finetune = 1; finetune <= FINETUNE_MAX; finetune++ )
// {
// detune = pow( 2, ( double )finetune / ( 12.0 * FINETUNE_RANGE ) );
// for( note = 0; note < 12; note++ )
// {
// NotePitch[ finetune ][ note ] = ( ( double )NotePitch[ 0 ][ note ] * detune );
// }
// }
}
static void AL_FlushCard(int const port)
{
for (int i = 0; i < NUMADLIBVOICES; i++)
{
if (VoiceReserved[i])
continue;
auto slot1 = offsetSlot[slotVoice[i][0]];
auto slot2 = offsetSlot[slotVoice[i][1]];
AL_SendOutputToPort(port, 0xA0 + i, 0);
AL_SendOutputToPort(port, 0xB0 + i, 0);
AL_SendOutputToPort(port, 0xE0 + slot1, 0);
AL_SendOutputToPort(port, 0xE0 + slot2, 0);
// Set the envelope to be fast and quiet
AL_SendOutputToPort(port, 0x60 + slot1, 0xff);
AL_SendOutputToPort(port, 0x60 + slot2, 0xff);
AL_SendOutputToPort(port, 0x80 + slot1, 0xff);
AL_SendOutputToPort(port, 0x80 + slot2, 0xff);
// Maximum attenuation
AL_SendOutputToPort(port, 0x40 + slot1, 0xff);
AL_SendOutputToPort(port, 0x40 + slot2, 0xff);
}
}
static void AL_Reset(void)
{
AL_SendOutputToPort(ADLIB_PORT, 1, 0x20);
AL_SendOutputToPort(ADLIB_PORT, 0x08, 0);
// Set the values: AM Depth, VIB depth & Rhythm
AL_SendOutputToPort(ADLIB_PORT, 0xBD, 0);
AL_SetStereo(AL_Stereo);
AL_FlushCard(AL_LeftPort);
AL_FlushCard(AL_RightPort);
}
void AL_SetStereo(int const stereo)
{
AL_SendOutputToPort(AL_RightPort, 0x5, (stereo<<1)+1);
}
static void AL_NoteOff(int const channel, int const key, int velocity)
{
UNREFERENCED_PARAMETER(velocity);
// We only play channels 1 through 10
if (channel > AL_MaxMidiChannel)
return;
int voice = AL_GetVoice(channel, key);
if (voice == AL_VoiceNotFound)
return;
Voice[voice].status = NOTE_OFF;
int port = Voice[voice].port;
int voc = (voice >= NUMADLIBVOICES) ? voice - NUMADLIBVOICES : voice;
AL_SendOutput(port, 0xB0 + voc, hibyte(Voice[voice].pitchleft));
LL_Remove(AdLibVoice, &Channel[channel].Voices, &Voice[voice]);
LL_AddToTail(AdLibVoice, &Voice_Pool, &Voice[voice]);
}
static void AL_NoteOn(int const channel, int const key, int const velocity)
{
// We only play channels 1 through 10
if (channel > AL_MaxMidiChannel)
return;
if (velocity == 0)
{
AL_NoteOff(channel, key, velocity);
return;
}
int voice = AL_AllocVoice();
if (voice == AL_VoiceNotFound)
{
if (Channel[9].Voices.start)
{
AL_NoteOff(9, Channel[9].Voices.start->key, 0);
voice = AL_AllocVoice();
}
if (voice == AL_VoiceNotFound)
return;
}
Voice[voice].key = key;
Voice[voice].channel = channel;
Voice[voice].velocity = velocity;
Voice[voice].status = NOTE_ON;
LL_AddToTail(AdLibVoice, &Channel[channel].Voices, &Voice[voice]);
AL_SetVoiceTimbre(voice);
AL_SetVoiceVolume(voice);
AL_SetVoicePitch(voice);
AL_SetVoicePan(voice);
}
static inline void AL_AllNotesOff(int const channel)
{
while (Channel[channel].Voices.start != nullptr)
AL_NoteOff(channel, Channel[channel].Voices.start->key, 0);
}
static void AL_ControlChange(int const channel, int const type, int const data)
{
// We only play channels 1 through 10
if (channel > AL_MaxMidiChannel)
return;
switch (type)
{
case MIDI_VOLUME:
AL_SetChannelVolume(channel, data);
break;
case MIDI_PAN:
AL_SetChannelPan(channel, data);
break;
case MIDI_DETUNE:
AL_SetChannelDetune(channel, data);
break;
case MIDI_ALL_NOTES_OFF:
AL_AllNotesOff(channel);
break;
case MIDI_RESET_ALL_CONTROLLERS:
AL_ResetVoices();
AL_SetChannelVolume(channel, AL_DefaultChannelVolume);
AL_SetChannelPan(channel, 64);
AL_SetChannelDetune(channel, 0);
break;
case MIDI_RPN_MSB:
Channel[channel].RPN &= 0x00FF;
Channel[channel].RPN |= (data & 0xFF) << 8;
break;
case MIDI_RPN_LSB:
Channel[channel].RPN &= 0xFF00;
Channel[channel].RPN |= data & 0xFF;
break;
case MIDI_DATAENTRY_MSB:
if (Channel[channel].RPN == MIDI_PITCHBEND_RPN)
{
Channel[channel].PitchBendSemiTones = data;
Channel[channel].PitchBendRange = Channel[channel].PitchBendSemiTones * 100 + Channel[channel].PitchBendHundreds;
}
break;
case MIDI_DATAENTRY_LSB:
if (Channel[channel].RPN == MIDI_PITCHBEND_RPN)
{
Channel[channel].PitchBendHundreds = data;
Channel[channel].PitchBendRange = Channel[channel].PitchBendSemiTones * 100 + Channel[channel].PitchBendHundreds;
}
break;
}
}
static void AL_ProgramChange(int const channel, int const patch)
{
// We only play channels 1 through 10
if (channel > AL_MaxMidiChannel)
return;
Channel[channel].Timbre = patch;
}
static void AL_SetPitchBend(int const channel, int const lsb, int const msb)
{
// We only play channels 1 through 10
if (channel > AL_MaxMidiChannel)
return;
int const pitchbend = lsb + (msb << 8);
Channel[channel].Pitchbend = pitchbend;
int TotalBend = pitchbend * Channel[channel].PitchBendRange;
TotalBend /= (PITCHBEND_CENTER / FINETUNE_RANGE);
Channel[channel].KeyOffset = (int)(TotalBend / FINETUNE_RANGE);
Channel[channel].KeyOffset -= Channel[channel].PitchBendSemiTones;
Channel[channel].KeyDetune = (uint32_t)(TotalBend % FINETUNE_RANGE);
auto voice = Channel[channel].Voices.start;
while (voice != nullptr)
{
AL_SetVoicePitch(voice->num);
voice = voice->next;
}
}
static void AL_Shutdown(void)
{
AL_ResetVoices();
AL_Reset();
}
static int AL_Init(int const rate)
{
OPL3_Reset(&chip, rate);
AL_LeftPort = ADLIB_PORT;
AL_RightPort = ADLIB_PORT + 2;
AL_CalcPitchInfo();
AL_Reset();
AL_ResetVoices();
return AdLibErr_Ok;
}
void AL_RegisterTimbreBank(uint8_t *timbres)
{
for (int i = 0; i < 256; i++)
{
ADLIB_TimbreBank[i].SAVEK[0] = *(timbres++);
ADLIB_TimbreBank[i].SAVEK[1] = *(timbres++);
ADLIB_TimbreBank[i].Level[0] = *(timbres++);
ADLIB_TimbreBank[i].Level[1] = *(timbres++);
ADLIB_TimbreBank[i].Env1[0] = *(timbres++);
ADLIB_TimbreBank[i].Env1[1] = *(timbres++);
ADLIB_TimbreBank[i].Env2[0] = *(timbres++);
ADLIB_TimbreBank[i].Env2[1] = *(timbres++);
ADLIB_TimbreBank[i].Wave[0] = *(timbres++);
ADLIB_TimbreBank[i].Wave[1] = *(timbres++);
ADLIB_TimbreBank[i].Feedback = *(timbres++);
ADLIB_TimbreBank[i].Transpose = *(int8_t *)(timbres++);
ADLIB_TimbreBank[i].Velocity = *(int8_t *)(timbres++);
}
}
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