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Genesis-Plus-GX/source/sound/ym2612.c
ekeeke31 6749058dad updated SDL and DOS versions
2008-08-21 20:34:00 +00:00

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/***********************************************************
* *
* YM2612.C : YM2612 emulator *
* *
* Almost constantes are taken from the MAME core *
* *
* This source is a part of Gens project *
* Written by Stéphane Dallongeville (gens@consolemul.com) *
* Copyright (c) 2002 by Stéphane Dallongeville *
* *
***********************************************************/
#include <stdio.h>
#include <math.h>
#include "shared.h"
/********************************************
* Partie définition *
********************************************/
#define YM_DEBUG_LEVEL 0
#ifndef PI
#define PI 3.14159265358979323846
#endif
#define ATTACK 0
#define DECAY 1
#define SUBSTAIN 2
#define RELEASE 3
// SIN_LBITS <= 16
// LFO_HBITS <= 16
// (SIN_LBITS + SIN_HBITS) <= 26
// (ENV_LBITS + ENV_HBITS) <= 28
// (LFO_LBITS + LFO_HBITS) <= 28
#define SIN_HBITS 12 // Sinus phase counter int part
#define SIN_LBITS (26 - SIN_HBITS) // Sinus phase counter float part (best setting)
#if (SIN_LBITS > 16)
#define SIN_LBITS 16 // Can't be greater than 16 bits
#endif
#define ENV_HBITS 12 // Env phase counter int part
#define ENV_LBITS (28 - ENV_HBITS) // Env phase counter float part (best setting)
#define LFO_HBITS 10 // LFO phase counter int part
#define LFO_LBITS (28 - LFO_HBITS) // LFO phase counter float part (best setting)
#define SIN_LENGHT (1 << SIN_HBITS)
#define ENV_LENGHT (1 << ENV_HBITS)
#define LFO_LENGHT (1 << LFO_HBITS)
#define TL_LENGHT (ENV_LENGHT * 3) // Env + TL scaling + LFO
#define SIN_MASK (SIN_LENGHT - 1)
#define ENV_MASK (ENV_LENGHT - 1)
#define LFO_MASK (LFO_LENGHT - 1)
#define ENV_STEP (96.0 / ENV_LENGHT) // ENV_MAX = 96 dB
#define ENV_ATTACK ((ENV_LENGHT * 0) << ENV_LBITS)
#define ENV_DECAY ((ENV_LENGHT * 1) << ENV_LBITS)
#define ENV_END ((ENV_LENGHT * 2) << ENV_LBITS)
#define MAX_OUT_BITS (SIN_HBITS + SIN_LBITS + 2) // Modulation = -4 <--> +4
#define MAX_OUT ((1 << MAX_OUT_BITS) - 1)
//Just for tests stuff...
//
//#define COEF_MOD 0.5
//#define MAX_OUT ((int) (((1 << MAX_OUT_BITS) - 1) * COEF_MOD))
#define OUT_BITS (OUTPUT_BITS - 2)
#define OUT_SHIFT (MAX_OUT_BITS - OUT_BITS)
#define LIMIT_CH_OUT ((int) (((1 << OUT_BITS) * 1.5) - 1))
#define PG_CUT_OFF ((int) (78.0 / ENV_STEP))
#define ENV_CUT_OFF ((int) (68.0 / ENV_STEP))
#define AR_RATE 399128
#define DR_RATE 5514396
//#define AR_RATE 426136
//#define DR_RATE (AR_RATE * 12)
#define LFO_FMS_LBITS 9 // FIXED (LFO_FMS_BASE gives somethink as 1)
#define LFO_FMS_BASE ((int) (0.05946309436 * 0.0338 * (double) (1 << LFO_FMS_LBITS)))
#define S0 0 // Stupid typo of the YM2612
#define S1 2
#define S2 1
#define S3 3
void YM2612_Timers_Update(int length);
void YM2612_Special_Update ();
// used for foward...
void Update_Chan_Algo0(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo1(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo2(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo3(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo4(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo5(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo6(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo7(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo0_LFO(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo1_LFO(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo2_LFO(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo3_LFO(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo4_LFO(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo5_LFO(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo6_LFO(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo7_LFO(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo0_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo1_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo2_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo3_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo4_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo5_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo6_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo7_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo0_LFO_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo1_LFO_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo2_LFO_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo3_LFO_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo4_LFO_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo5_LFO_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo6_LFO_Int(channel_ *CH, int **buf, int lenght);
void Update_Chan_Algo7_LFO_Int(channel_ *CH, int **buf, int lenght);
// used for foward...
void Env_Attack_Next(slot_ *SL);
void Env_Decay_Next(slot_ *SL);
void Env_Substain_Next(slot_ *SL);
void Env_Release_Next(slot_ *SL);
void Env_NULL_Next(slot_ *SL);
/********************************************
* Partie variables *
********************************************/
struct ym2612__ YM2612;
int *SIN_TAB[SIN_LENGHT]; // SINUS TABLE (pointer on TL TABLE)
int TL_TAB[TL_LENGHT * 2]; // TOTAL LEVEL TABLE (positif and minus)
unsigned int ENV_TAB[2 * ENV_LENGHT + 8]; // ENV CURVE TABLE (attack & decay)
//unsigned int ATTACK_TO_DECAY[ENV_LENGHT]; // Conversion from attack to decay phase
unsigned int DECAY_TO_ATTACK[ENV_LENGHT]; // Conversion from decay to attack phase
unsigned int FINC_TAB[2048]; // Frequency step table
unsigned int AR_TAB[128]; // Attack rate table
unsigned int DR_TAB[96]; // Decay rate table
unsigned int DT_TAB[8][32]; // Detune table
unsigned int SL_TAB[16]; // Substain level table
unsigned int NULL_RATE[32]; // Table for NULL rate
int LFO_ENV_TAB[LFO_LENGHT]; // LFO AMS TABLE (adjusted for 11.8 dB)
int LFO_FREQ_TAB[LFO_LENGHT]; // LFO FMS TABLE
int LFO_ENV_UP[MAX_UPDATE_LENGHT]; // Temporary calculated LFO AMS (adjusted for 11.8 dB)
int LFO_FREQ_UP[MAX_UPDATE_LENGHT]; // Temporary calculated LFO FMS
int INTER_TAB[MAX_UPDATE_LENGHT]; // Interpolation table
int LFO_INC_TAB[8]; // LFO step table
int in0, in1, in2, in3; // current phase calculation
int en0, en1, en2, en3; // current enveloppe calculation
static void (*UPDATE_CHAN[8 * 8])(channel_ *CH, int **buf, int lenght) = // Update Channel functions pointer table
{
(void *)Update_Chan_Algo0,
(void *)Update_Chan_Algo1,
(void *)Update_Chan_Algo2,
(void *)Update_Chan_Algo3,
(void *)Update_Chan_Algo4,
(void *)Update_Chan_Algo5,
(void *)Update_Chan_Algo6,
(void *)Update_Chan_Algo7,
(void *)Update_Chan_Algo0_LFO,
(void *)Update_Chan_Algo1_LFO,
(void *)Update_Chan_Algo2_LFO,
(void *)Update_Chan_Algo3_LFO,
(void *)Update_Chan_Algo4_LFO,
(void *)Update_Chan_Algo5_LFO,
(void *)Update_Chan_Algo6_LFO,
(void *)Update_Chan_Algo7_LFO,
(void *)Update_Chan_Algo0_Int,
(void *)Update_Chan_Algo1_Int,
(void *)Update_Chan_Algo2_Int,
(void *)Update_Chan_Algo3_Int,
(void *)Update_Chan_Algo4_Int,
(void *)Update_Chan_Algo5_Int,
(void *)Update_Chan_Algo6_Int,
(void *)Update_Chan_Algo7_Int,
(void *)Update_Chan_Algo0_LFO_Int,
(void *)Update_Chan_Algo1_LFO_Int,
(void *)Update_Chan_Algo2_LFO_Int,
(void *)Update_Chan_Algo3_LFO_Int,
(void *)Update_Chan_Algo4_LFO_Int,
(void *)Update_Chan_Algo5_LFO_Int,
(void *)Update_Chan_Algo6_LFO_Int,
(void *)Update_Chan_Algo7_LFO_Int
};
static void (*ENV_NEXT_EVENT[8])(slot_ *SL) = // Next Enveloppe phase functions pointer table
{
(void *)Env_Attack_Next,
(void *)Env_Decay_Next,
(void *)Env_Substain_Next,
(void *)Env_Release_Next,
(void *)Env_NULL_Next,
(void *)Env_NULL_Next,
(void *)Env_NULL_Next,
(void *)Env_NULL_Next
};
const unsigned int DT_DEF_TAB[4 * 32] =
{
// FD = 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
// FD = 1
0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2,
2, 3, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 8, 8, 8, 8,
// FD = 2
1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5,
5, 6, 6, 7, 8, 8, 9, 10, 11, 12, 13, 14, 16, 16, 16, 16,
// FD = 3
2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7,
8 , 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 20, 22, 22, 22, 22
};
const unsigned int FKEY_TAB[16] =
{
0, 0, 0, 0,
0, 0, 0, 1,
2, 3, 3, 3,
3, 3, 3, 3
};
const unsigned int LFO_AMS_TAB[4] =
{
31, 4, 1, 0
};
const unsigned int LFO_FMS_TAB[8] =
{
LFO_FMS_BASE * 0, LFO_FMS_BASE * 1,
LFO_FMS_BASE * 2, LFO_FMS_BASE * 3,
LFO_FMS_BASE * 4, LFO_FMS_BASE * 6,
LFO_FMS_BASE * 12, LFO_FMS_BASE * 24
};
int int_cnt; // Interpolation calculation
#if YM_DEBUG_LEVEL > 0 // Debug
FILE *debug_file = NULL;
#endif
/***********************************************
* fonctions calcul param *
***********************************************/
INLINE void CALC_FINC_SL(slot_ *SL, int finc, int kc)
{
int ksr;
SL->Finc = (finc + SL->DT[kc]) * SL->MUL;
/* YM2612 Detune Bug (discovered by Nemesis) */
if (SL->Finc < 0)
{
/* Phase overflow (best result with BLOCK = 5) */
finc = (int)((double)FINC_TAB[0x7FF] / YM2612.Frequence) >> 2;
SL->Finc = (finc + SL->DT[kc]) * SL->MUL;
}
ksr = kc >> SL->KSR_S; // keycode atténuation
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "FINC = %d SL->Finc = %d\n", finc, SL->Finc);
#endif
if (SL->KSR != ksr) // si le KSR a changé alors
{ // les différents taux pour l'enveloppe sont mis à jour
SL->KSR = ksr;
SL->EincA = SL->AR[ksr];
SL->EincD = SL->DR[ksr];
SL->EincS = SL->SR[ksr];
SL->EincR = SL->RR[ksr];
if (SL->Ecurp == ATTACK) SL->Einc = SL->EincA;
else if (SL->Ecurp == DECAY) SL->Einc = SL->EincD;
else if (SL->Ecnt < ENV_END)
{
if (SL->Ecurp == SUBSTAIN) SL->Einc = SL->EincS;
else if (SL->Ecurp == RELEASE) SL->Einc = SL->EincR;
}
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "KSR = %.4X EincA = %.8X EincD = %.8X EincS = %.8X EincR = %.8X\n", ksr, SL->EincA, SL->EincD, SL->EincS, SL->EincR);
#endif
}
}
INLINE void CALC_FINC_CH(channel_ *CH)
{
int finc, kc;
finc = FINC_TAB[CH->FNUM[0]] >> (7 - CH->FOCT[0]);
kc = CH->KC[0];
CALC_FINC_SL(&CH->SLOT[0], finc, kc);
CALC_FINC_SL(&CH->SLOT[1], finc, kc);
CALC_FINC_SL(&CH->SLOT[2], finc, kc);
CALC_FINC_SL(&CH->SLOT[3], finc, kc);
}
/***********************************************
* fonctions setting *
***********************************************/
INLINE void KEY_ON(channel_ *CH, int nsl)
{
slot_ *SL = &(CH->SLOT[nsl]); // on recupère le bon pointeur de slot
if (SL->Ecurp == RELEASE) // la touche est-elle relâchée ?
{
SL->Fcnt = 0;
// Fix Ecco 2 splash sound
SL->Ecnt = (DECAY_TO_ATTACK[ENV_TAB[SL->Ecnt >> ENV_LBITS]] + ENV_ATTACK) & SL->ChgEnM;
SL->ChgEnM = 0xFFFFFFFF;
// SL->Ecnt = DECAY_TO_ATTACK[ENV_TAB[SL->Ecnt >> ENV_LBITS]] + ENV_ATTACK;
// SL->Ecnt = 0;
SL->Einc = SL->EincA;
SL->Ecmp = ENV_DECAY;
SL->Ecurp = ATTACK;
}
}
INLINE void KEY_OFF(channel_ *CH, int nsl)
{
slot_ *SL = &(CH->SLOT[nsl]); // on recupère le bon pointeur de slot
if (SL->Ecurp != RELEASE) // la touche est-elle appuyée ?
{
if (SL->Ecnt < ENV_DECAY) // attack phase ?
{
SL->Ecnt = (ENV_TAB[SL->Ecnt >> ENV_LBITS] << ENV_LBITS) + ENV_DECAY;
}
SL->Einc = SL->EincR;
SL->Ecmp = ENV_END;
SL->Ecurp = RELEASE;
}
}
INLINE void CSM_Key_Control()
{
KEY_ON(&YM2612.CHANNEL[2], 0);
KEY_ON(&YM2612.CHANNEL[2], 1);
KEY_ON(&YM2612.CHANNEL[2], 2);
KEY_ON(&YM2612.CHANNEL[2], 3);
/* found by Nemesis */
KEY_OFF(&YM2612.CHANNEL[2], 0);
KEY_OFF(&YM2612.CHANNEL[2], 1);
KEY_OFF(&YM2612.CHANNEL[2], 2);
KEY_OFF(&YM2612.CHANNEL[2], 3);
}
int SLOT_SET(int Adr, unsigned char data)
{
channel_ *CH;
slot_ *SL;
int nch, nsl;
if ((nch = Adr & 3) == 3) return 1;
nsl = (Adr >> 2) & 3;
if (Adr & 0x100) nch += 3;
CH = &(YM2612.CHANNEL[nch]);
SL = &(CH->SLOT[nsl]);
switch(Adr & 0xF0)
{
case 0x30:
if ((SL->MUL = (data & 0x0F))) SL->MUL <<= 1;
else SL->MUL = 1;
SL->DT = (int *)DT_TAB[(data >> 4) & 7];
CH->SLOT[0].Finc = -1;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d], SLOT[%d] DTMUL = %.2X\n", nch, nsl, data & 0x7F);
#endif
break;
case 0x40:
SL->TL = data & 0x7F;
// SOR2 do a lot of TL adjustement and this fix R.Shinobi jump sound...
YM2612_Special_Update();
#if ((ENV_HBITS - 7) < 0)
SL->TLL = SL->TL >> (7 - ENV_HBITS);
#else
SL->TLL = SL->TL << (ENV_HBITS - 7);
#endif
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d], SLOT[%d] TL = %.2X\n", nch, nsl, SL->TL);
#endif
break;
case 0x50:
SL->KSR_S = 3 - (data >> 6);
CH->SLOT[0].Finc = -1;
if (data &= 0x1F) SL->AR = (int *)&AR_TAB[data << 1];
else SL->AR = (int *)&NULL_RATE[0];
SL->EincA = SL->AR[SL->KSR];
if (SL->Ecurp == ATTACK) SL->Einc = SL->EincA;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d], SLOT[%d] AR = %.2X EincA = %.6X\n", nch, nsl, data, SL->EincA);
#endif
break;
case 0x60:
if ((SL->AMSon = (data & 0x80))) SL->AMS = CH->AMS;
else SL->AMS = 31;
if (data &= 0x1F) SL->DR = (int *)&DR_TAB[data << 1];
else SL->DR = (int *)&NULL_RATE[0];
SL->EincD = SL->DR[SL->KSR];
if (SL->Ecurp == DECAY) SL->Einc = SL->EincD;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d], SLOT[%d] AMS = %d DR = %.2X EincD = %.6X\n", nch, nsl, SL->AMSon, data, SL->EincD);
#endif
break;
case 0x70:
if (data &= 0x1F) SL->SR = (int *)&DR_TAB[data << 1];
else SL->SR = (int *)&NULL_RATE[0];
SL->EincS = SL->SR[SL->KSR];
if ((SL->Ecurp == SUBSTAIN) && (SL->Ecnt < ENV_END)) SL->Einc = SL->EincS;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d], SLOT[%d] SR = %.2X EincS = %.6X\n", nch, nsl, data, SL->EincS);
#endif
break;
case 0x80:
SL->SLL = SL_TAB[data >> 4];
SL->RR = (int *)&DR_TAB[((data & 0xF) << 2) + 2];
SL->EincR = SL->RR[SL->KSR];
if ((SL->Ecurp == RELEASE) && (SL->Ecnt < ENV_END)) SL->Einc = SL->EincR;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d], SLOT[%d] SL = %.8X\n", nch, nsl, SL->SLL);
fprintf(debug_file, "CHANNEL[%d], SLOT[%d] RR = %.2X EincR = %.2X\n", nch, nsl, ((data & 0xF) << 1) | 2, SL->EincR);
#endif
break;
case 0x90:
/*
// SSG-EG envelope shapes :
//
// E At Al H
//
// 1 0 0 0 \\\\
//
// 1 0 0 1 \___
//
// 1 0 1 0 \/\/
// ___
// 1 0 1 1 \
//
// 1 1 0 0 ////
// ___
// 1 1 0 1 /
//
// 1 1 1 0 /\/\
//
// 1 1 1 1 /___
//
// E = SSG-EG enable
// At = Start negate
// Al = Altern
// H = Hold
*/
if (data & 0x08) SL->SEG = data & 0x0F;
else SL->SEG = 0;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d], SLOT[%d] SSG-EG = %.2X\n", nch, nsl, data);
#endif
break;
}
return 0;
}
int CHANNEL_SET(int Adr, unsigned char data)
{
channel_ *CH;
int num;
if ((num = Adr & 3) == 3) return 1;
switch(Adr & 0xFC)
{
case 0xA0:
if (Adr & 0x100) num += 3;
CH = &(YM2612.CHANNEL[num]);
YM2612_Special_Update();
CH->FNUM[0] = (CH->FNUM[0] & 0x700) + data;
CH->KC[0] = (CH->FOCT[0] << 2) | FKEY_TAB[CH->FNUM[0] >> 7];
CH->SLOT[0].Finc = -1;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d] part1 FNUM = %d KC = %d\n", num, CH->FNUM[0], CH->KC[0]);
#endif
break;
case 0xA4:
if (Adr & 0x100) num += 3;
CH = &(YM2612.CHANNEL[num]);
YM2612_Special_Update();
CH->FNUM[0] = (CH->FNUM[0] & 0x0FF) + ((int) (data & 0x07) << 8);
CH->FOCT[0] = (data & 0x38) >> 3;
CH->KC[0] = (CH->FOCT[0] << 2) | FKEY_TAB[CH->FNUM[0] >> 7];
CH->SLOT[0].Finc = -1;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d] part2 FNUM = %d FOCT = %d KC = %d\n", num, CH->FNUM[0], CH->FOCT[0], CH->KC[0]);
#endif
break;
case 0xA8:
if (Adr < 0x100)
{
num++;
YM2612_Special_Update();
YM2612.CHANNEL[2].FNUM[num] = (YM2612.CHANNEL[2].FNUM[num] & 0x700) + data;
YM2612.CHANNEL[2].KC[num] = (YM2612.CHANNEL[2].FOCT[num] << 2) | FKEY_TAB[YM2612.CHANNEL[2].FNUM[num] >> 7];
YM2612.CHANNEL[2].SLOT[0].Finc = -1;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[2] part1 FNUM[%d] = %d KC[%d] = %d\n", num, YM2612.CHANNEL[2].FNUM[num], num, YM2612.CHANNEL[2].KC[num]);
#endif
}
break;
case 0xAC:
if (Adr < 0x100)
{
num++;
YM2612_Special_Update();
YM2612.CHANNEL[2].FNUM[num] = (YM2612.CHANNEL[2].FNUM[num] & 0x0FF) + ((int) (data & 0x07) << 8);
YM2612.CHANNEL[2].FOCT[num] = (data & 0x38) >> 3;
YM2612.CHANNEL[2].KC[num] = (YM2612.CHANNEL[2].FOCT[num] << 2) | FKEY_TAB[YM2612.CHANNEL[2].FNUM[num] >> 7];
YM2612.CHANNEL[2].SLOT[0].Finc = -1;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[2] part2 FNUM[%d] = %d FOCT[%d] = %d KC[%d] = %d\n", num, YM2612.CHANNEL[2].FNUM[num], num, YM2612.CHANNEL[2].FOCT[num], num, YM2612.CHANNEL[2].KC[num]);
#endif
}
break;
case 0xB0:
if (Adr & 0x100) num += 3;
CH = &(YM2612.CHANNEL[num]);
if (CH->ALGO != (data & 7))
{
// Fix VectorMan 2 heli sound (level 1)
YM2612_Special_Update();
CH->ALGO = data & 7;
CH->SLOT[0].ChgEnM = 0;
CH->SLOT[1].ChgEnM = 0;
CH->SLOT[2].ChgEnM = 0;
CH->SLOT[3].ChgEnM = 0;
}
CH->FB = 9 - ((data >> 3) & 7); // Real thing ?
// if (CH->FB = ((data >> 3) & 7)) CH->FB = 9 - CH->FB; // Thunder force 4 (music stage 8), Gynoug, Aladdin bug sound...
// else CH->FB = 31;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "CHANNEL[%d] ALGO = %d FB = %d\n", num, CH->ALGO, CH->FB);
#endif
break;
case 0xB4:
if (Adr & 0x100) num += 3;
CH = &(YM2612.CHANNEL[num]);
YM2612_Special_Update();
if (data & 0x80) CH->LEFT = 0xFFFFFFFF;
else CH->LEFT = 0;
if (data & 0x40) CH->RIGHT = 0xFFFFFFFF;
else CH->RIGHT = 0;
CH->AMS = LFO_AMS_TAB[(data >> 4) & 3];
CH->FMS = LFO_FMS_TAB[data & 7];
if (CH->SLOT[0].AMSon) CH->SLOT[0].AMS = CH->AMS;
else CH->SLOT[0].AMS = 31;
if (CH->SLOT[1].AMSon) CH->SLOT[1].AMS = CH->AMS;
else CH->SLOT[1].AMS = 31;
if (CH->SLOT[2].AMSon) CH->SLOT[2].AMS = CH->AMS;
else CH->SLOT[2].AMS = 31;
if (CH->SLOT[3].AMSon) CH->SLOT[3].AMS = CH->AMS;
else CH->SLOT[3].AMS = 31;
#if YM_DEBUG_LEVEL > 0
fprintf(debug_file, "CHANNEL[%d] AMS = %d FMS = %d\n", num, CH->AMS, CH->FMS);
#endif
break;
}
return 0;
}
int YM_SET(int Adr, unsigned char data)
{
channel_ *CH;
int nch;
switch(Adr)
{
case 0x22:
if (data & 8)
{
// Cool Spot music 1, LFO modified severals time which
// distord the sound, have to check that on a real genesis...
YM2612.LFOinc = LFO_INC_TAB[data & 7];
#if YM_DEBUG_LEVEL > 0
fprintf(debug_file, "\nLFO Enable, LFOinc = %.8X %d\n", YM2612.LFOinc, data & 7);
#endif
}
else
{
YM2612.LFOinc = YM2612.LFOcnt = 0;
#if YM_DEBUG_LEVEL > 0
fprintf(debug_file, "\nLFO Disable\n");
#endif
}
break;
case 0x24:
YM2612.TimerA = (YM2612.TimerA & 0x003) | (((int) data) << 2);
YM2612.TimerAL = (1024 - YM2612.TimerA) << 12;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "Timer A Set = %.8X\n", YM2612.TimerAL);
#endif
break;
case 0x25:
YM2612.TimerA = (YM2612.TimerA & 0x3fc) | (data & 3);
YM2612.TimerAL = (1024 - YM2612.TimerA) << 12;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "Timer A Set = %.8X\n", YM2612.TimerAL);
#endif
break;
case 0x26:
YM2612.TimerB = data;
YM2612.TimerBL = (256 - YM2612.TimerB) << (4 + 12);
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "Timer B Set = %.8X\n", YM2612.TimerBL);
#endif
break;
case 0x27:
// Paramètre divers
// b7 = CSM MODE
// b6 = 3 slot mode
// b5 = reset b
// b4 = reset a
// b3 = timer enable b
// b2 = timer enable a
// b1 = load b
// b0 = load a
if ((data ^ YM2612.Mode) & 0xC0)
{
// We changed the channel 2 mode, so recalculate phase step
// This fix the punch sound in Street of Rage 2
YM2612_Special_Update();
YM2612.CHANNEL[2].SLOT[0].Finc = -1; // recalculate phase step
}
if ((data & 2) && !(YM2612.Mode & 2)) YM2612.TimerBcnt = YM2612.TimerBL;
if ((data & 1) && !(YM2612.Mode & 1)) YM2612.TimerAcnt = YM2612.TimerAL;
YM2612.Status &= (~data >> 4)/* & (data >> 2)*/; // Reset Status
YM2612.Mode = data;
#if YM_DEBUG_LEVEL > 0
fprintf(debug_file, "Mode reg = %.2X\n", data);
#endif
break;
case 0x28:
if ((nch = data & 3) == 3) return 1;
if (data & 4) nch += 3;
CH = &(YM2612.CHANNEL[nch]);
YM2612_Special_Update();
if (data & 0x10) KEY_ON(CH, S0); // On appuie sur la touche pour le slot 1
else KEY_OFF(CH, S0); // On relâche la touche pour le slot 1
if (data & 0x20) KEY_ON(CH, S1); // On appuie sur la touche pour le slot 3
else KEY_OFF(CH, S1); // On relâche la touche pour le slot 3
if (data & 0x40) KEY_ON(CH, S2); // On appuie sur la touche pour le slot 2
else KEY_OFF(CH, S2); // On relâche la touche pour le slot 2
if (data & 0x80) KEY_ON(CH, S3); // On appuie sur la touche pour le slot 4
else KEY_OFF(CH, S3); // On relâche la touche pour le slot 4
#if YM_DEBUG_LEVEL > 0
fprintf(debug_file, "CHANNEL[%d] KEY %.1X\n", nch, ((data & 0xf0) >> 4));
#endif
break;
case 0x2A:
YM2612.DACdata = ((int) data - 0x80) << 7; // donnée du DAC
break;
case 0x2B:
if (YM2612.DAC ^ (data & 0x80)) YM2612_Special_Update();
YM2612.DAC = data & 0x80; // activation/désactivation du DAC
break;
}
return 0;
}
/***********************************************
* fonctions de génération *
***********************************************/
void Env_NULL_Next(slot_ *SL)
{
}
void Env_Attack_Next(slot_ *SL)
{
// Verified with Gynoug even in HQ (explode SFX)
SL->Ecnt = ENV_DECAY;
SL->Einc = SL->EincD;
SL->Ecmp = SL->SLL;
SL->Ecurp = DECAY;
}
void Env_Decay_Next(slot_ *SL)
{
// Verified with Gynoug even in HQ (explode SFX)
SL->Ecnt = SL->SLL;
SL->Einc = SL->EincS;
SL->Ecmp = ENV_END;
SL->Ecurp = SUBSTAIN;
}
void Env_Substain_Next(slot_ *SL)
{
if (SL->SEG & 8) // SSG envelope type
{
if (SL->SEG & 1)
{
SL->Ecnt = ENV_END;
SL->Einc = 0;
SL->Ecmp = ENV_END + 1;
}
else
{
// re KEY ON
// SL->Fcnt = 0;
// SL->ChgEnM = 0xFFFFFFFF;
SL->Ecnt = 0;
SL->Einc = SL->EincA;
SL->Ecmp = ENV_DECAY;
SL->Ecurp = ATTACK;
}
SL->SEG ^= (SL->SEG & 2) << 1;
}
else
{
SL->Ecnt = ENV_END;
SL->Einc = 0;
SL->Ecmp = ENV_END + 1;
}
}
void Env_Release_Next(slot_ *SL)
{
SL->Ecnt = ENV_END;
SL->Einc = 0;
SL->Ecmp = ENV_END + 1;
}
#define GET_CURRENT_PHASE \
in0 = CH->SLOT[S0].Fcnt; \
in1 = CH->SLOT[S1].Fcnt; \
in2 = CH->SLOT[S2].Fcnt; \
in3 = CH->SLOT[S3].Fcnt;
#define UPDATE_PHASE \
CH->SLOT[S0].Fcnt += CH->SLOT[S0].Finc; \
CH->SLOT[S1].Fcnt += CH->SLOT[S1].Finc; \
CH->SLOT[S2].Fcnt += CH->SLOT[S2].Finc; \
CH->SLOT[S3].Fcnt += CH->SLOT[S3].Finc;
#define UPDATE_PHASE_LFO \
if ((freq_LFO = (CH->FMS * LFO_FREQ_UP[i]) >> (LFO_HBITS - 1))) \
{ \
CH->SLOT[S0].Fcnt += CH->SLOT[S0].Finc + ((CH->SLOT[S0].Finc * freq_LFO) >> LFO_FMS_LBITS); \
CH->SLOT[S1].Fcnt += CH->SLOT[S1].Finc + ((CH->SLOT[S1].Finc * freq_LFO) >> LFO_FMS_LBITS); \
CH->SLOT[S2].Fcnt += CH->SLOT[S2].Finc + ((CH->SLOT[S2].Finc * freq_LFO) >> LFO_FMS_LBITS); \
CH->SLOT[S3].Fcnt += CH->SLOT[S3].Finc + ((CH->SLOT[S3].Finc * freq_LFO) >> LFO_FMS_LBITS); \
} \
else \
{ \
CH->SLOT[S0].Fcnt += CH->SLOT[S0].Finc; \
CH->SLOT[S1].Fcnt += CH->SLOT[S1].Finc; \
CH->SLOT[S2].Fcnt += CH->SLOT[S2].Finc; \
CH->SLOT[S3].Fcnt += CH->SLOT[S3].Finc; \
}
#define GET_CURRENT_ENV \
if (CH->SLOT[S0].SEG & 4) \
{ \
if ((en0 = ENV_TAB[(CH->SLOT[S0].Ecnt >> ENV_LBITS)] + CH->SLOT[S0].TLL) > ENV_MASK) en0 = 0; \
else en0 ^= ENV_MASK; \
} \
else en0 = ENV_TAB[(CH->SLOT[S0].Ecnt >> ENV_LBITS)] + CH->SLOT[S0].TLL; \
if (CH->SLOT[S1].SEG & 4) \
{ \
if ((en1 = ENV_TAB[(CH->SLOT[S1].Ecnt >> ENV_LBITS)] + CH->SLOT[S1].TLL) > ENV_MASK) en1 = 0; \
else en1 ^= ENV_MASK; \
} \
else en1 = ENV_TAB[(CH->SLOT[S1].Ecnt >> ENV_LBITS)] + CH->SLOT[S1].TLL; \
if (CH->SLOT[S2].SEG & 4) \
{ \
if ((en2 = ENV_TAB[(CH->SLOT[S2].Ecnt >> ENV_LBITS)] + CH->SLOT[S2].TLL) > ENV_MASK) en2 = 0; \
else en2 ^= ENV_MASK; \
} \
else en2 = ENV_TAB[(CH->SLOT[S2].Ecnt >> ENV_LBITS)] + CH->SLOT[S2].TLL; \
if (CH->SLOT[S3].SEG & 4) \
{ \
if ((en3 = ENV_TAB[(CH->SLOT[S3].Ecnt >> ENV_LBITS)] + CH->SLOT[S3].TLL) > ENV_MASK) en3 = 0; \
else en3 ^= ENV_MASK; \
} \
else en3 = ENV_TAB[(CH->SLOT[S3].Ecnt >> ENV_LBITS)] + CH->SLOT[S3].TLL;
#define GET_CURRENT_ENV_LFO \
env_LFO = LFO_ENV_UP[i]; \
\
if (CH->SLOT[S0].SEG & 4) \
{ \
if ((en0 = ENV_TAB[(CH->SLOT[S0].Ecnt >> ENV_LBITS)] + CH->SLOT[S0].TLL) > ENV_MASK) en0 = 0; \
else en0 = (en0 ^ ENV_MASK) + (env_LFO >> CH->SLOT[S0].AMS); \
} \
else en0 = ENV_TAB[(CH->SLOT[S0].Ecnt >> ENV_LBITS)] + CH->SLOT[S0].TLL + (env_LFO >> CH->SLOT[S0].AMS); \
if (CH->SLOT[S1].SEG & 4) \
{ \
if ((en1 = ENV_TAB[(CH->SLOT[S1].Ecnt >> ENV_LBITS)] + CH->SLOT[S1].TLL) > ENV_MASK) en1 = 0; \
else en1 = (en1 ^ ENV_MASK) + (env_LFO >> CH->SLOT[S1].AMS); \
} \
else en1 = ENV_TAB[(CH->SLOT[S1].Ecnt >> ENV_LBITS)] + CH->SLOT[S1].TLL + (env_LFO >> CH->SLOT[S1].AMS); \
if (CH->SLOT[S2].SEG & 4) \
{ \
if ((en2 = ENV_TAB[(CH->SLOT[S2].Ecnt >> ENV_LBITS)] + CH->SLOT[S2].TLL) > ENV_MASK) en2 = 0; \
else en2 = (en2 ^ ENV_MASK) + (env_LFO >> CH->SLOT[S2].AMS); \
} \
else en2 = ENV_TAB[(CH->SLOT[S2].Ecnt >> ENV_LBITS)] + CH->SLOT[S2].TLL + (env_LFO >> CH->SLOT[S2].AMS); \
if (CH->SLOT[S3].SEG & 4) \
{ \
if ((en3 = ENV_TAB[(CH->SLOT[S3].Ecnt >> ENV_LBITS)] + CH->SLOT[S3].TLL) > ENV_MASK) en3 = 0; \
else en3 = (en3 ^ ENV_MASK) + (env_LFO >> CH->SLOT[S3].AMS); \
} \
else en3 = ENV_TAB[(CH->SLOT[S3].Ecnt >> ENV_LBITS)] + CH->SLOT[S3].TLL + (env_LFO >> CH->SLOT[S3].AMS);
#define UPDATE_ENV \
if ((CH->SLOT[S0].Ecnt += CH->SLOT[S0].Einc) >= CH->SLOT[S0].Ecmp) \
ENV_NEXT_EVENT[CH->SLOT[S0].Ecurp](&(CH->SLOT[S0])); \
if ((CH->SLOT[S1].Ecnt += CH->SLOT[S1].Einc) >= CH->SLOT[S1].Ecmp) \
ENV_NEXT_EVENT[CH->SLOT[S1].Ecurp](&(CH->SLOT[S1])); \
if ((CH->SLOT[S2].Ecnt += CH->SLOT[S2].Einc) >= CH->SLOT[S2].Ecmp) \
ENV_NEXT_EVENT[CH->SLOT[S2].Ecurp](&(CH->SLOT[S2])); \
if ((CH->SLOT[S3].Ecnt += CH->SLOT[S3].Einc) >= CH->SLOT[S3].Ecmp) \
ENV_NEXT_EVENT[CH->SLOT[S3].Ecurp](&(CH->SLOT[S3]));
#define DO_LIMIT \
if (CH->OUTd > LIMIT_CH_OUT) CH->OUTd = LIMIT_CH_OUT; \
else if (CH->OUTd < -LIMIT_CH_OUT) CH->OUTd = -LIMIT_CH_OUT;
#define DO_FEEDBACK0 \
in0 += CH->S0_OUT[0] >> CH->FB; \
CH->S0_OUT[0] = SIN_TAB[(in0 >> SIN_LBITS) & SIN_MASK][en0];
#define DO_FEEDBACK \
in0 += (CH->S0_OUT[0] + CH->S0_OUT[1]) >> CH->FB; \
CH->S0_OUT[1] = CH->S0_OUT[0]; \
CH->S0_OUT[0] = SIN_TAB[(in0 >> SIN_LBITS) & SIN_MASK][en0];
#define DO_FEEDBACK2 \
in0 += (CH->S0_OUT[0] + (CH->S0_OUT[0] >> 2) + CH->S0_OUT[1]) >> CH->FB; \
CH->S0_OUT[1] = CH->S0_OUT[0] >> 2; \
CH->S0_OUT[0] = SIN_TAB[(in0 >> SIN_LBITS) & SIN_MASK][en0];
#define DO_FEEDBACK3 \
in0 += (CH->S0_OUT[0] + CH->S0_OUT[1] + CH->S0_OUT[2] + CH->S0_OUT[3]) >> CH->FB; \
CH->S0_OUT[3] = CH->S0_OUT[2] >> 1; \
CH->S0_OUT[2] = CH->S0_OUT[1] >> 1; \
CH->S0_OUT[1] = CH->S0_OUT[0] >> 1; \
CH->S0_OUT[0] = SIN_TAB[(in0 >> SIN_LBITS) & SIN_MASK][en0];
#define DO_ALGO_0 \
DO_FEEDBACK \
in1 += CH->S0_OUT[1]; \
in2 += SIN_TAB[(in1 >> SIN_LBITS) & SIN_MASK][en1]; \
in3 += SIN_TAB[(in2 >> SIN_LBITS) & SIN_MASK][en2]; \
CH->OUTd = (SIN_TAB[(in3 >> SIN_LBITS) & SIN_MASK][en3]) >> OUT_SHIFT;
#define DO_ALGO_1 \
DO_FEEDBACK \
in2 += CH->S0_OUT[1] + SIN_TAB[(in1 >> SIN_LBITS) & SIN_MASK][en1]; \
in3 += SIN_TAB[(in2 >> SIN_LBITS) & SIN_MASK][en2]; \
CH->OUTd = (SIN_TAB[(in3 >> SIN_LBITS) & SIN_MASK][en3]) >> OUT_SHIFT;
#define DO_ALGO_2 \
DO_FEEDBACK \
in2 += SIN_TAB[(in1 >> SIN_LBITS) & SIN_MASK][en1]; \
in3 += CH->S0_OUT[1] + SIN_TAB[(in2 >> SIN_LBITS) & SIN_MASK][en2]; \
CH->OUTd = (SIN_TAB[(in3 >> SIN_LBITS) & SIN_MASK][en3]) >> OUT_SHIFT;
#define DO_ALGO_3 \
DO_FEEDBACK \
in1 += CH->S0_OUT[1]; \
in3 += SIN_TAB[(in1 >> SIN_LBITS) & SIN_MASK][en1] + SIN_TAB[(in2 >> SIN_LBITS) & SIN_MASK][en2]; \
CH->OUTd = (SIN_TAB[(in3 >> SIN_LBITS) & SIN_MASK][en3]) >> OUT_SHIFT;
#define DO_ALGO_4 \
DO_FEEDBACK \
in1 += CH->S0_OUT[1]; \
in3 += SIN_TAB[(in2 >> SIN_LBITS) & SIN_MASK][en2]; \
CH->OUTd = ((int) SIN_TAB[(in3 >> SIN_LBITS) & SIN_MASK][en3] + (int) SIN_TAB[(in1 >> SIN_LBITS) & SIN_MASK][en1]) >> OUT_SHIFT; \
DO_LIMIT
#define DO_ALGO_5 \
DO_FEEDBACK \
in1 += CH->S0_OUT[1]; \
in2 += CH->S0_OUT[1]; \
in3 += CH->S0_OUT[1]; \
CH->OUTd = ((int) SIN_TAB[(in3 >> SIN_LBITS) & SIN_MASK][en3] + (int) SIN_TAB[(in1 >> SIN_LBITS) & SIN_MASK][en1] + (int) SIN_TAB[(in2 >> SIN_LBITS) & SIN_MASK][en2]) >> OUT_SHIFT; \
DO_LIMIT
#define DO_ALGO_6 \
DO_FEEDBACK \
in1 += CH->S0_OUT[1]; \
CH->OUTd = ((int) SIN_TAB[(in3 >> SIN_LBITS) & SIN_MASK][en3] + (int) SIN_TAB[(in1 >> SIN_LBITS) & SIN_MASK][en1] + (int) SIN_TAB[(in2 >> SIN_LBITS) & SIN_MASK][en2]) >> OUT_SHIFT; \
DO_LIMIT
#define DO_ALGO_7 \
DO_FEEDBACK \
CH->OUTd = ((int) SIN_TAB[(in3 >> SIN_LBITS) & SIN_MASK][en3] + (int) SIN_TAB[(in1 >> SIN_LBITS) & SIN_MASK][en1] + (int) SIN_TAB[(in2 >> SIN_LBITS) & SIN_MASK][en2] + CH->S0_OUT[1]) >> OUT_SHIFT; \
DO_LIMIT
#define DO_OUTPUT \
buf[0][i] += CH->OUTd & CH->LEFT; \
buf[1][i] += CH->OUTd & CH->RIGHT;
#define DO_OUTPUT_INT0 \
if ((int_cnt += YM2612.Inter_Step) & 0x04000) \
{ \
int_cnt &= 0x3FFF; \
buf[0][i] += CH->OUTd & CH->LEFT; \
buf[1][i] += CH->OUTd & CH->RIGHT; \
} \
else i--;
#define DO_OUTPUT_INT1 \
CH->Old_OUTd = (CH->OUTd + CH->Old_OUTd) >> 1; \
if ((int_cnt += YM2612.Inter_Step) & 0x04000) \
{ \
int_cnt &= 0x3FFF; \
buf[0][i] += CH->Old_OUTd & CH->LEFT; \
buf[1][i] += CH->Old_OUTd & CH->RIGHT; \
} \
else i--;
#define DO_OUTPUT_INT2 \
if ((int_cnt += YM2612.Inter_Step) & 0x04000) \
{ \
int_cnt &= 0x3FFF; \
CH->Old_OUTd = (CH->OUTd + CH->Old_OUTd) >> 1; \
buf[0][i] += CH->Old_OUTd & CH->LEFT; \
buf[1][i] += CH->Old_OUTd & CH->RIGHT; \
} \
else i--; \
CH->Old_OUTd = CH->OUTd;
#define DO_OUTPUT_INT \
if ((int_cnt += YM2612.Inter_Step) & 0x04000) \
{ \
int_cnt &= 0x3FFF; \
CH->Old_OUTd = (((int_cnt ^ 0x3FFF) * CH->OUTd) + (int_cnt * CH->Old_OUTd)) >> 14; \
buf[0][i] += CH->Old_OUTd & CH->LEFT; \
buf[1][i] += CH->Old_OUTd & CH->RIGHT; \
} \
else i--; \
CH->Old_OUTd = CH->OUTd;
void Update_Chan_Algo0(channel_ *CH, int **buf, int lenght)
{
int i;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 0 len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_0
DO_OUTPUT
}
}
void Update_Chan_Algo1(channel_ *CH, int **buf, int lenght)
{
int i;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 1 len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_1
DO_OUTPUT
}
}
void Update_Chan_Algo2(channel_ *CH, int **buf, int lenght)
{
int i;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 2 len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_2
DO_OUTPUT
}
}
void Update_Chan_Algo3(channel_ *CH, int **buf, int lenght)
{
int i;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 3 len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_3
DO_OUTPUT
}
}
void Update_Chan_Algo4(channel_ *CH, int **buf, int lenght)
{
int i;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 4 len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_4
DO_OUTPUT
}
}
void Update_Chan_Algo5(channel_ *CH, int **buf, int lenght)
{
int i;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 5 len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_5
DO_OUTPUT
}
}
void Update_Chan_Algo6(channel_ *CH, int **buf, int lenght)
{
int i;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 6 len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_6
DO_OUTPUT
}
}
void Update_Chan_Algo7(channel_ *CH, int **buf, int lenght)
{
int i;
if ((CH->SLOT[S0].Ecnt == ENV_END) && (CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 7 len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_7
DO_OUTPUT
}
}
void Update_Chan_Algo0_LFO(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 0 LFO len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_0
DO_OUTPUT
}
}
void Update_Chan_Algo1_LFO(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 1 LFO len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_1
DO_OUTPUT
}
}
void Update_Chan_Algo2_LFO(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 2 LFO len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_2
DO_OUTPUT
}
}
void Update_Chan_Algo3_LFO(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 3 LFO len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_3
DO_OUTPUT
}
}
void Update_Chan_Algo4_LFO(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 4 LFO len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_4
DO_OUTPUT
}
}
void Update_Chan_Algo5_LFO(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 5 LFO len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_5
DO_OUTPUT
}
}
void Update_Chan_Algo6_LFO(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 6 LFO len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_6
DO_OUTPUT
}
}
void Update_Chan_Algo7_LFO(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if ((CH->SLOT[S0].Ecnt == ENV_END) && (CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 7 LFO len = %d\n\n", lenght);
#endif
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_7
DO_OUTPUT
}
}
/******************************************************
* Interpolated output *
*****************************************************/
void Update_Chan_Algo0_Int(channel_ *CH, int **buf, int lenght)
{
int i;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 0 len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_0
DO_OUTPUT_INT
}
}
void Update_Chan_Algo1_Int(channel_ *CH, int **buf, int lenght)
{
int i;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 1 len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_1
DO_OUTPUT_INT
}
}
void Update_Chan_Algo2_Int(channel_ *CH, int **buf, int lenght)
{
int i;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 2 len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_2
DO_OUTPUT_INT
}
}
void Update_Chan_Algo3_Int(channel_ *CH, int **buf, int lenght)
{
int i;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 3 len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_3
DO_OUTPUT_INT
}
}
void Update_Chan_Algo4_Int(channel_ *CH, int **buf, int lenght)
{
int i;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 4 len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_4
DO_OUTPUT_INT
}
}
void Update_Chan_Algo5_Int(channel_ *CH, int **buf, int lenght)
{
int i;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 5 len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_5
DO_OUTPUT_INT
}
}
void Update_Chan_Algo6_Int(channel_ *CH, int **buf, int lenght)
{
int i;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 6 len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_6
DO_OUTPUT_INT
}
}
void Update_Chan_Algo7_Int(channel_ *CH, int **buf, int lenght)
{
int i;
if ((CH->SLOT[S0].Ecnt == ENV_END) && (CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 7 len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE
GET_CURRENT_ENV
UPDATE_ENV
DO_ALGO_7
DO_OUTPUT_INT
}
}
void Update_Chan_Algo0_LFO_Int(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 0 LFO len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_0
DO_OUTPUT_INT
}
}
void Update_Chan_Algo1_LFO_Int(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 1 LFO len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_1
DO_OUTPUT_INT
}
}
void Update_Chan_Algo2_LFO_Int(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 2 LFO len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_2
DO_OUTPUT_INT
}
}
void Update_Chan_Algo3_LFO_Int(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if (CH->SLOT[S3].Ecnt == ENV_END) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 3 LFO len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_3
DO_OUTPUT_INT
}
}
void Update_Chan_Algo4_LFO_Int(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 4 LFO len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_4
DO_OUTPUT_INT
}
}
void Update_Chan_Algo5_LFO_Int(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 5 LFO len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_5
DO_OUTPUT_INT
}
}
void Update_Chan_Algo6_LFO_Int(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if ((CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 6 LFO len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_6
DO_OUTPUT_INT
}
}
void Update_Chan_Algo7_LFO_Int(channel_ *CH, int **buf, int lenght)
{
int i, env_LFO, freq_LFO;
if ((CH->SLOT[S0].Ecnt == ENV_END) && (CH->SLOT[S1].Ecnt == ENV_END) && (CH->SLOT[S2].Ecnt == ENV_END) && (CH->SLOT[S3].Ecnt == ENV_END)) return;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nAlgo 7 LFO len = %d\n\n", lenght);
#endif
int_cnt = YM2612.Inter_Cnt;
for(i = 0; i < lenght; i++)
{
GET_CURRENT_PHASE
UPDATE_PHASE_LFO
GET_CURRENT_ENV_LFO
UPDATE_ENV
DO_ALGO_7
DO_OUTPUT_INT
}
}
/***********************************************
* fonctions publiques *
***********************************************/
static long dac_highpass;
// Initialisation de l'émulateur YM2612
int YM2612_Init(int Clock, int Rate, int Interpolation)
{
int i, j;
double x;
if ((Rate == 0) || (Clock == 0)) return 1;
memset(&YM2612, 0, sizeof(YM2612));
#if YM_DEBUG_LEVEL > 0
if (debug_file == NULL)
{
debug_file = fopen("ym2612.log", "w");
fprintf(debug_file, "YM2612 logging :\n\n");
}
#endif
YM2612.Clock = Clock;
YM2612.Rate = Rate;
// 144 = 12 * (prescale * 2) = 12 * 6 * 2
// prescale set to 6 by default
YM2612.Frequence = ((double) YM2612.Clock / (double) YM2612.Rate) / 144.0;
YM2612.TimerBase = (int) (YM2612.Frequence * 4096.0);
if ((Interpolation) && (YM2612.Frequence > 1.0))
{
YM2612.Inter_Step = (unsigned int) ((1.0 / YM2612.Frequence) * (double) (0x4000));
YM2612.Inter_Cnt = 0;
// We recalculate rate and frequence after interpolation
YM2612.Rate = YM2612.Clock / 144;
YM2612.Frequence = 1.0;
}
else
{
YM2612.Inter_Step = 0x4000;
YM2612.Inter_Cnt = 0;
}
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "YM2612 frequence = %g rate = %d interp step = %.8X\n\n", YM2612.Frequence, YM2612.Rate, YM2612.Inter_Step);
#endif
// Tableau TL :
// [0 - 4095] = +output [4095 - ...] = +output overflow (fill with 0)
// [12288 - 16383] = -output [16384 - ...] = -output overflow (fill with 0)
for(i = 0; i < TL_LENGHT; i++)
{
if (i >= PG_CUT_OFF) // YM2612 cut off sound after 78 dB (14 bits output ?)
{
TL_TAB[TL_LENGHT + i] = TL_TAB[i] = 0;
}
else
{
x = MAX_OUT; // Max output
x /= pow(10, (ENV_STEP * i) / 20); // Decibel -> Voltage
TL_TAB[i] = (int) x;
TL_TAB[TL_LENGHT + i] = -TL_TAB[i];
}
#if YM_DEBUG_LEVEL > 2
fprintf(debug_file, "TL_TAB[%d] = %.8X TL_TAB[%d] = %.8X\n", i, TL_TAB[i], TL_LENGHT + i, TL_TAB[TL_LENGHT + i]);
#endif
}
#if YM_DEBUG_LEVEL > 2
fprintf(debug_file, "\n\n\n\n");
#endif
// Tableau SIN :
// SIN_TAB[x][y] = sin(x) * y;
// x = phase and y = volume
SIN_TAB[0] = SIN_TAB[SIN_LENGHT / 2] = &TL_TAB[(int)PG_CUT_OFF];
for(i = 1; i <= SIN_LENGHT / 4; i++)
{
x = sin(2.0 * PI * (double) (i) / (double) (SIN_LENGHT)); // Sinus
x = 20 * log10(1 / x); // convert to dB
j = (int) (x / ENV_STEP); // Get TL range
if (j > PG_CUT_OFF) j = (int) PG_CUT_OFF;
SIN_TAB[i] = SIN_TAB[(SIN_LENGHT / 2) - i] = &TL_TAB[j];
SIN_TAB[(SIN_LENGHT / 2) + i] = SIN_TAB[SIN_LENGHT - i] = &TL_TAB[TL_LENGHT + j];
#if YM_DEBUG_LEVEL > 2
fprintf(debug_file, "SIN[%d][0] = %.8X SIN[%d][0] = %.8X SIN[%d][0] = %.8X SIN[%d][0] = %.8X\n", i, SIN_TAB[i][0], (SIN_LENGHT / 2) - i, SIN_TAB[(SIN_LENGHT / 2) - i][0], (SIN_LENGHT / 2) + i, SIN_TAB[(SIN_LENGHT / 2) + i][0], SIN_LENGHT - i, SIN_TAB[SIN_LENGHT - i][0]);
#endif
}
#if YM_DEBUG_LEVEL > 2
fprintf(debug_file, "\n\n\n\n");
#endif
// Tableau LFO (LFO wav) :
for(i = 0; i < LFO_LENGHT; i++)
{
x = sin(2.0 * PI * (double) (i) / (double) (LFO_LENGHT)); // Sinus
x += 1.0;
x /= 2.0; // positive only
x *= 11.8 / ENV_STEP; // ajusted to MAX enveloppe modulation
LFO_ENV_TAB[i] = (int) x;
x = sin(2.0 * PI * (double) (i) / (double) (LFO_LENGHT)); // Sinus
x *= (double) ((1 << (LFO_HBITS - 1)) - 1);
LFO_FREQ_TAB[i] = (int) x;
#if YM_DEBUG_LEVEL > 2
fprintf(debug_file, "LFO[%d] = %.8X\n", i, LFO_ENV_TAB[i]);
#endif
}
#if YM_DEBUG_LEVEL > 2
fprintf(debug_file, "\n\n\n\n");
#endif
// Tableau Enveloppe :
// ENV_TAB[0] -> ENV_TAB[ENV_LENGHT - 1] = attack curve
// ENV_TAB[ENV_LENGHT] -> ENV_TAB[2 * ENV_LENGHT - 1] = decay curve
for(i = 0; i < ENV_LENGHT; i++)
{
// Attack curve (x^8 - music level 2 Vectorman 2)
x = pow(((double) ((ENV_LENGHT - 1) - i) / (double) (ENV_LENGHT)), 8);
x *= ENV_LENGHT;
ENV_TAB[i] = (int) x;
// Decay curve (just linear)
x = pow(((double) (i) / (double) (ENV_LENGHT)), 1);
x *= ENV_LENGHT;
ENV_TAB[ENV_LENGHT + i] = (int) x;
#if YM_DEBUG_LEVEL > 2
fprintf(debug_file, "ATTACK[%d] = %d DECAY[%d] = %d\n", i, ENV_TAB[i], i, ENV_TAB[ENV_LENGHT + i]);
#endif
}
ENV_TAB[ENV_END >> ENV_LBITS] = ENV_LENGHT - 1; // for the stopped state
// Tableau pour la conversion Attack -> Decay and Decay -> Attack
for(i = 0, j = ENV_LENGHT - 1; i < ENV_LENGHT; i++)
{
while (j && (ENV_TAB[j] < (unsigned) i)) j--;
DECAY_TO_ATTACK[i] = j << ENV_LBITS;
}
// Tableau pour le Substain Level
for(i = 0; i < 15; i++)
{
x = i * 3; // 3 and not 6 (Mickey Mania first music for test)
x /= ENV_STEP;
j = (int) x;
j <<= ENV_LBITS;
SL_TAB[i] = j + ENV_DECAY;
}
j = ENV_LENGHT - 1; // special case : volume off
j <<= ENV_LBITS;
SL_TAB[15] = j + ENV_DECAY;
// Tableau Frequency Step
for(i = 0; i < 2048; i++)
{
x = (double) (i) * YM2612.Frequence;
#if ((SIN_LBITS + SIN_HBITS - (21 - 7)) < 0)
x /= (double) (1 << ((21 - 7) - SIN_LBITS - SIN_HBITS));
#else
x *= (double) (1 << (SIN_LBITS + SIN_HBITS - (21 - 7)));
#endif
x /= 2.0; // because MUL = value * 2
FINC_TAB[i] = (unsigned int) x;
}
// Tableaux Attack & Decay Rate
for(i = 0; i < 4; i++)
{
AR_TAB[i] = 0;
DR_TAB[i] = 0;
}
for(i = 0; i < 60; i++)
{
x = YM2612.Frequence;
x *= 1.0 + ((i & 3) * 0.25); // bits 0-1 : x1.00, x1.25, x1.50, x1.75
x *= (double) (1 << ((i >> 2))); // bits 2-5 : shift bits (x2^0 - x2^15)
x *= (double) (ENV_LENGHT << ENV_LBITS); // on ajuste pour le tableau ENV_TAB
AR_TAB[i + 4] = (unsigned int) (x / AR_RATE);
DR_TAB[i + 4] = (unsigned int) (x / DR_RATE);
}
for(i = 64; i < 96; i++)
{
AR_TAB[i] = AR_TAB[63];
DR_TAB[i] = DR_TAB[63];
NULL_RATE[i - 64] = 0;
}
// Tableau Detune
for(i = 0; i < 4; i++)
{
for (j = 0; j < 32; j++)
{
#if ((SIN_LBITS + SIN_HBITS - 21) < 0)
x = (double) DT_DEF_TAB[(i << 5) + j] * YM2612.Frequence / (double) (1 << (21 - SIN_LBITS - SIN_HBITS));
#else
x = (double) DT_DEF_TAB[(i << 5) + j] * YM2612.Frequence * (double) (1 << (SIN_LBITS + SIN_HBITS - 21));
#endif
DT_TAB[i + 0][j] = (int) x;
DT_TAB[i + 4][j] = (int) -x;
}
}
// Tableau LFO
j = (YM2612.Rate * YM2612.Inter_Step) / 0x4000;
LFO_INC_TAB[0] = (unsigned int) (3.98 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / j);
LFO_INC_TAB[1] = (unsigned int) (5.56 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / j);
LFO_INC_TAB[2] = (unsigned int) (6.02 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / j);
LFO_INC_TAB[3] = (unsigned int) (6.37 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / j);
LFO_INC_TAB[4] = (unsigned int) (6.88 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / j);
LFO_INC_TAB[5] = (unsigned int) (9.63 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / j);
LFO_INC_TAB[6] = (unsigned int) (48.1 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / j);
LFO_INC_TAB[7] = (unsigned int) (72.2 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / j);
YM2612_Reset();
return 0;
}
int YM2612_Reset(void)
{
int i, j;
YM2612.LFOcnt = 0;
YM2612.TimerA = 0;
YM2612.TimerAL = 0;
YM2612.TimerAcnt = 0;
YM2612.TimerB = 0;
YM2612.TimerBL = 0;
YM2612.TimerBcnt = 0;
YM2612.DAC = 0;
YM2612.DACdata = 0;
dac_highpass = 0;
YM2612.Status = 0;
YM2612.OPNAadr = 0;
YM2612.OPNBadr = 0;
YM2612.Inter_Cnt = 0;
for(i = 0; i < 6; i++)
{
YM2612.CHANNEL[i].Old_OUTd = 0;
YM2612.CHANNEL[i].OUTd = 0;
YM2612.CHANNEL[i].LEFT = 0xFFFFFFFF;
YM2612.CHANNEL[i].RIGHT = 0xFFFFFFFF;
YM2612.CHANNEL[i].ALGO = 0;;
YM2612.CHANNEL[i].FB = 31;
YM2612.CHANNEL[i].FMS = 0;
YM2612.CHANNEL[i].AMS = 0;
for(j = 0 ;j < 4 ; j++)
{
YM2612.CHANNEL[i].S0_OUT[j] = 0;
YM2612.CHANNEL[i].FNUM[j] = 0;
YM2612.CHANNEL[i].FOCT[j] = 0;
YM2612.CHANNEL[i].KC[j] = 0;
YM2612.CHANNEL[i].SLOT[j].Fcnt = 0;
YM2612.CHANNEL[i].SLOT[j].Finc = 0;
YM2612.CHANNEL[i].SLOT[j].Ecnt = ENV_END; // Put it at the end of Decay phase...
YM2612.CHANNEL[i].SLOT[j].Einc = 0;
YM2612.CHANNEL[i].SLOT[j].Ecmp = 0;
YM2612.CHANNEL[i].SLOT[j].Ecurp = RELEASE;
YM2612.CHANNEL[i].SLOT[j].ChgEnM = 0;
}
}
for(i = 0; i < 0x100; i++)
{
YM2612.REG[0][i] = -1;
YM2612.REG[1][i] = -1;
}
for(i = 0xB6; i >= 0xB4; i--)
{
YM2612_Write(0, (unsigned char) i);
YM2612_Write(2, (unsigned char) i);
YM2612_Write(1, 0xC0);
YM2612_Write(3, 0xC0);
}
for(i = 0xB2; i >= 0x22; i--)
{
YM2612_Write(0, (unsigned char) i);
YM2612_Write(2, (unsigned char) i);
YM2612_Write(1, 0);
YM2612_Write(3, 0);
}
YM2612_Write(0, 0x2A);
YM2612_Write(1, 0x80);
#if YM_DEBUG_LEVEL > 0
fprintf(debug_file, "\n\nFinishing reseting YM2612 ...\n\n");
#endif
return 0;
}
int YM2612_Read(void)
{
/* static int cnt = 0;
if (cnt++ == 50)
{
cnt = 0;
return YM2612.Status;
}
else return YM2612.Status | 0x80;
*/
return YM2612.Status;
}
int YM2612_Write(unsigned char adr, unsigned char data)
{
int d;
//data &= 0xFF;
adr &= 0x03;
switch(adr)
{
case 0:
YM2612.OPNAadr = data;
break;
case 1:
// Trivial optimisation
if (YM2612.OPNAadr == 0x2A)
{
YM2612.DACdata = ((int) data - 0x80) << 7;
YM2612.REG[0][0x2A] = data;
return 0;
}
d = YM2612.OPNAadr & 0xF0;
if (d >= 0x30)
{
if (YM2612.REG[0][YM2612.OPNAadr] == data) return 2;
YM2612.REG[0][YM2612.OPNAadr] = data;
if (d < 0xA0) // SLOT
{
SLOT_SET(YM2612.OPNAadr, data);
}
else // CHANNEL
{
CHANNEL_SET(YM2612.OPNAadr, data);
}
}
else // YM2612
{
YM2612.REG[0][YM2612.OPNAadr] = data;
YM_SET(YM2612.OPNAadr, data);
}
break;
case 2:
YM2612.OPNBadr = data;
break;
case 3:
d = YM2612.OPNBadr & 0xF0;
if (d >= 0x30)
{
if (YM2612.REG[1][YM2612.OPNBadr] == data) return 2;
YM2612.REG[1][YM2612.OPNBadr] = data;
if (d < 0xA0) // SLOT
{
SLOT_SET(YM2612.OPNBadr + 0x100, data);
}
else // CHANNEL
{
CHANNEL_SET(YM2612.OPNBadr + 0x100, data);
}
}
else return 1;
break;
}
return 0;
}
void YM2612_Update(int **buf, int length)
{
int i, j, algo_type;
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nStarting generating sound...\n\n");
#endif
// Mise à jour des pas des compteurs-fréquences s'ils ont été modifiés
if (YM2612.CHANNEL[0].SLOT[0].Finc == -1) CALC_FINC_CH(&YM2612.CHANNEL[0]);
if (YM2612.CHANNEL[1].SLOT[0].Finc == -1) CALC_FINC_CH(&YM2612.CHANNEL[1]);
if (YM2612.CHANNEL[2].SLOT[0].Finc == -1)
{
/*----------------------
|Mode| Behaviour |
|----|---------------|
| 00 | Normal |
| 01 | Special |
| 10 | Special + CSM |
| 11 | Special |
---------------------- */
if (YM2612.Mode & 0xC0)
{
CALC_FINC_SL(&(YM2612.CHANNEL[2].SLOT[S0]), FINC_TAB[YM2612.CHANNEL[2].FNUM[2]] >> (7 - YM2612.CHANNEL[2].FOCT[2]), YM2612.CHANNEL[2].KC[2]);
CALC_FINC_SL(&(YM2612.CHANNEL[2].SLOT[S1]), FINC_TAB[YM2612.CHANNEL[2].FNUM[3]] >> (7 - YM2612.CHANNEL[2].FOCT[3]), YM2612.CHANNEL[2].KC[3]);
CALC_FINC_SL(&(YM2612.CHANNEL[2].SLOT[S2]), FINC_TAB[YM2612.CHANNEL[2].FNUM[1]] >> (7 - YM2612.CHANNEL[2].FOCT[1]), YM2612.CHANNEL[2].KC[1]);
CALC_FINC_SL(&(YM2612.CHANNEL[2].SLOT[S3]), FINC_TAB[YM2612.CHANNEL[2].FNUM[0]] >> (7 - YM2612.CHANNEL[2].FOCT[0]), YM2612.CHANNEL[2].KC[0]);
}
else
{
CALC_FINC_CH(&YM2612.CHANNEL[2]);
}
}
if (YM2612.CHANNEL[3].SLOT[0].Finc == -1) CALC_FINC_CH(&YM2612.CHANNEL[3]);
if (YM2612.CHANNEL[4].SLOT[0].Finc == -1) CALC_FINC_CH(&YM2612.CHANNEL[4]);
if (YM2612.CHANNEL[5].SLOT[0].Finc == -1) CALC_FINC_CH(&YM2612.CHANNEL[5]);
/*
CALC_FINC_CH(&YM2612.CHANNEL[0]);
CALC_FINC_CH(&YM2612.CHANNEL[1]);
if (YM2612.Mode & 0x40)
{
CALC_FINC_SL(&(YM2612.CHANNEL[2].SLOT[0]), FINC_TAB[YM2612.CHANNEL[2].FNUM[2]] >> (7 - YM2612.CHANNEL[2].FOCT[2]), YM2612.CHANNEL[2].KC[2]);
CALC_FINC_SL(&(YM2612.CHANNEL[2].SLOT[1]), FINC_TAB[YM2612.CHANNEL[2].FNUM[3]] >> (7 - YM2612.CHANNEL[2].FOCT[3]), YM2612.CHANNEL[2].KC[3]);
CALC_FINC_SL(&(YM2612.CHANNEL[2].SLOT[2]), FINC_TAB[YM2612.CHANNEL[2].FNUM[1]] >> (7 - YM2612.CHANNEL[2].FOCT[1]), YM2612.CHANNEL[2].KC[1]);
CALC_FINC_SL(&(YM2612.CHANNEL[2].SLOT[3]), FINC_TAB[YM2612.CHANNEL[2].FNUM[0]] >> (7 - YM2612.CHANNEL[2].FOCT[0]), YM2612.CHANNEL[2].KC[0]);
}
else
{
CALC_FINC_CH(&YM2612.CHANNEL[2]);
}
CALC_FINC_CH(&YM2612.CHANNEL[3]);
CALC_FINC_CH(&YM2612.CHANNEL[4]);
CALC_FINC_CH(&YM2612.CHANNEL[5]);
*/
if (YM2612.Inter_Step & 0x04000) algo_type = 0;
else algo_type = 16;
if (YM2612.LFOinc)
{
// Precalcul LFO wav
for(i = 0; i < length; i++)
{
j = ((YM2612.LFOcnt += YM2612.LFOinc) >> LFO_LBITS) & LFO_MASK;
LFO_ENV_UP[i] = LFO_ENV_TAB[j];
LFO_FREQ_UP[i] = LFO_FREQ_TAB[j];
#if YM_DEBUG_LEVEL > 3
fprintf(debug_file, "LFO_ENV_UP[%d] = %d LFO_FREQ_UP[%d] = %d\n", i, LFO_ENV_UP[i], i, LFO_FREQ_UP[i]);
#endif
}
algo_type |= 8;
}
UPDATE_CHAN[YM2612.CHANNEL[0].ALGO + algo_type](&(YM2612.CHANNEL[0]), buf, length);
UPDATE_CHAN[YM2612.CHANNEL[1].ALGO + algo_type](&(YM2612.CHANNEL[1]), buf, length);
UPDATE_CHAN[YM2612.CHANNEL[2].ALGO + algo_type](&(YM2612.CHANNEL[2]), buf, length);
UPDATE_CHAN[YM2612.CHANNEL[3].ALGO + algo_type](&(YM2612.CHANNEL[3]), buf, length);
UPDATE_CHAN[YM2612.CHANNEL[4].ALGO + algo_type](&(YM2612.CHANNEL[4]), buf, length);
if (!(YM2612.DAC)) UPDATE_CHAN[YM2612.CHANNEL[5].ALGO + algo_type](&(YM2612.CHANNEL[5]), buf, length);
else
{
for(i = 0; i < length; i++)
{
buf[0][i] += YM2612.DACdata & YM2612.CHANNEL[5].LEFT;
buf[1][i] += YM2612.DACdata & YM2612.CHANNEL[5].RIGHT;
}
}
YM2612.Inter_Cnt = int_cnt;
/* update timers here */
YM2612_Timers_Update(length);
#if YM_DEBUG_LEVEL > 1
fprintf(debug_file, "\n\nFinishing generating sound...\n\n");
#endif
}
void YM2612_Timers_Update(int length)
{
int i;
i = YM2612.TimerBase * length;
if (YM2612.Mode & 1) // Timer A ON ?
{
if ((YM2612.TimerAcnt -= i) <= 0)
{
YM2612.Status |= (YM2612.Mode & 0x04) >> 2;
YM2612.TimerAcnt += YM2612.TimerAL;
/*----------------------
|Mode| Behaviour |
|----|---------------|
| 00 | Normal |
| 01 | Special |
| 10 | Special + CSM |
| 11 | Special |
---------------------- */
if ((YM2612.Mode & 0xC0) == 0x80) CSM_Key_Control(); // found by Nemesis
}
}
if (YM2612.Mode & 2) // Timer B ON ?
{
if ((YM2612.TimerBcnt -= i) <= 0)
{
YM2612.Status |= (YM2612.Mode & 0x08) >> 2;
YM2612.TimerBcnt += YM2612.TimerBL;
}
}
}
void YM2612_Special_Update ()
{}
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