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+// Game_Music_Emu 0.5.5. http://www.slack.net/~ant/
+
+// Based on Gens 2.10 ym2612.c
+
+#include "Ym2612_Emu.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <stdio.h>
+#include <math.h>
+
+/* Copyright (C) 2002 Stéphane Dallongeville (gens AT consolemul.com) */
+/* Copyright (C) 2004-2006 Shay Green. This module is free software; you
+can redistribute it and/or modify it under the terms of the GNU Lesser
+General Public License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version. This
+module 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 Lesser General Public License for more
+details. You should have received a copy of the GNU Lesser General Public
+License along with this module; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
+
+// This is mostly the original source in its C style and all.
+//
+// Somewhat optimized and simplified. Uses a template to generate the many
+// variants of Update_Chan. Rewrote header file. In need of full rewrite by
+// someone more familiar with FM sound and the YM2612. Has some inaccuracies
+// compared to the Sega Genesis sound, particularly being mixed at such a
+// high sample accuracy (the Genesis sounds like it has only 8 bit samples).
+// - Shay
+
+#ifdef BLARGG_ENABLE_OPTIMIZER
+ #include BLARGG_ENABLE_OPTIMIZER
+#endif
+
+const int output_bits = 14;
+
+struct slot_t
+{
+ const int *DT; // parametre detune
+ int MUL; // parametre "multiple de frequence"
+ int TL; // Total Level = volume lorsque l'enveloppe est au plus haut
+ int TLL; // Total Level ajusted
+ int SLL; // Sustin Level (ajusted) = volume où l'enveloppe termine sa premiere phase de regression
+ int KSR_S; // Key Scale Rate Shift = facteur de prise en compte du KSL dans la variations de l'enveloppe
+ int KSR; // Key Scale Rate = cette valeur est calculee par rapport à la frequence actuelle, elle va influer
+ // sur les differents parametres de l'enveloppe comme l'attaque, le decay ... comme dans la realite !
+ int SEG; // Type enveloppe SSG
+ int env_xor;
+ int env_max;
+
+ const int *AR; // Attack Rate (table pointeur) = Taux d'attaque (AR[KSR])
+ const int *DR; // Decay Rate (table pointeur) = Taux pour la regression (DR[KSR])
+ const int *SR; // Sustin Rate (table pointeur) = Taux pour le maintien (SR[KSR])
+ const int *RR; // Release Rate (table pointeur) = Taux pour le rel'chement (RR[KSR])
+ int Fcnt; // Frequency Count = compteur-frequence pour determiner l'amplitude actuelle (SIN[Finc >> 16])
+ int Finc; // frequency step = pas d'incrementation du compteur-frequence
+ // plus le pas est grand, plus la frequence est aïgu (ou haute)
+ int Ecurp; // Envelope current phase = cette variable permet de savoir dans quelle phase
+ // de l'enveloppe on se trouve, par exemple phase d'attaque ou phase de maintenue ...
+ // en fonction de la valeur de cette variable, on va appeler une fonction permettant
+ // de mettre à jour l'enveloppe courante.
+ int Ecnt; // Envelope counter = le compteur-enveloppe permet de savoir où l'on se trouve dans l'enveloppe
+ int Einc; // Envelope step courant
+ int Ecmp; // Envelope counter limite pour la prochaine phase
+ int EincA; // Envelope step for Attack = pas d'incrementation du compteur durant la phase d'attaque
+ // cette valeur est egal à AR[KSR]
+ int EincD; // Envelope step for Decay = pas d'incrementation du compteur durant la phase de regression
+ // cette valeur est egal à DR[KSR]
+ int EincS; // Envelope step for Sustain = pas d'incrementation du compteur durant la phase de maintenue
+ // cette valeur est egal à SR[KSR]
+ int EincR; // Envelope step for Release = pas d'incrementation du compteur durant la phase de rel'chement
+ // cette valeur est egal à RR[KSR]
+ int *OUTp; // pointeur of SLOT output = pointeur permettant de connecter la sortie de ce slot à l'entree
+ // d'un autre ou carrement à la sortie de la voie
+ int INd; // input data of the slot = donnees en entree du slot
+ int ChgEnM; // Change envelop mask.
+ int AMS; // AMS depth level of this SLOT = degre de modulation de l'amplitude par le LFO
+ int AMSon; // AMS enable flag = drapeau d'activation de l'AMS
+};
+
+struct channel_t
+{
+ int S0_OUT[4]; // anciennes sorties slot 0 (pour le feed back)
+ int LEFT; // LEFT enable flag
+ int RIGHT; // RIGHT enable flag
+ int ALGO; // Algorythm = determine les connections entre les operateurs
+ int FB; // shift count of self feed back = degre de "Feed-Back" du SLOT 1 (il est son unique entree)
+ int FMS; // Frequency Modulation Sensitivity of channel = degre de modulation de la frequence sur la voie par le LFO
+ int AMS; // Amplitude Modulation Sensitivity of channel = degre de modulation de l'amplitude sur la voie par le LFO
+ int FNUM[4]; // hauteur frequence de la voie (+ 3 pour le mode special)
+ int FOCT[4]; // octave de la voie (+ 3 pour le mode special)
+ int KC[4]; // Key Code = valeur fonction de la frequence (voir KSR pour les slots, KSR = KC >> KSR_S)
+ slot_t SLOT[4]; // four slot.operators = les 4 slots de la voie
+ int FFlag; // Frequency step recalculation flag
+};
+
+struct state_t
+{
+ int TimerBase; // TimerBase calculation
+ int Status; // YM2612 Status (timer overflow)
+ int TimerA; // timerA limit = valeur jusqu'à laquelle le timer A doit compter
+ int TimerAL;
+ int TimerAcnt; // timerA counter = valeur courante du Timer A
+ int TimerB; // timerB limit = valeur jusqu'à laquelle le timer B doit compter
+ int TimerBL;
+ int TimerBcnt; // timerB counter = valeur courante du Timer B
+ int Mode; // Mode actuel des voie 3 et 6 (normal / special)
+ int DAC; // DAC enabled flag
+ channel_t CHANNEL[Ym2612_Emu::channel_count]; // Les 6 voies du YM2612
+ int REG[2][0x100]; // Sauvegardes des valeurs de tout les registres, c'est facultatif
+ // cela nous rend le debuggage plus facile
+};
+
+#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)
+
+#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
+
+inline void set_seg( slot_t& s, int seg )
+{
+ s.env_xor = 0;
+ s.env_max = INT_MAX;
+ s.SEG = seg;
+ if ( seg & 4 )
+ {
+ s.env_xor = ENV_MASK;
+ s.env_max = ENV_MASK;
+ }
+}
+
+struct tables_t
+{
+ short SIN_TAB [SIN_LENGHT]; // SINUS TABLE (offset into TL TABLE)
+ int LFOcnt; // LFO counter = compteur-frequence pour le LFO
+ int LFOinc; // LFO step counter = pas d'incrementation du compteur-frequence du LFO
+ // plus le pas est grand, plus la frequence est grande
+ 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_INC_TAB [8]; // LFO step table
+
+ short ENV_TAB [2 * ENV_LENGHT + 8]; // ENV CURVE TABLE (attack & decay)
+
+ short LFO_ENV_TAB [LFO_LENGHT]; // LFO AMS TABLE (adjusted for 11.8 dB)
+ short LFO_FREQ_TAB [LFO_LENGHT]; // LFO FMS TABLE
+ int TL_TAB [TL_LENGHT * 2]; // TOTAL LEVEL TABLE (positif and minus)
+ unsigned int DECAY_TO_ATTACK [ENV_LENGHT]; // Conversion from decay to attack phase
+ unsigned int FINC_TAB [2048]; // Frequency step table
+};
+
+static const unsigned char 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
+};
+
+static const unsigned char FKEY_TAB [16] =
+{
+ 0, 0, 0, 0,
+ 0, 0, 0, 1,
+ 2, 3, 3, 3,
+ 3, 3, 3, 3
+};
+
+static const unsigned char LFO_AMS_TAB [4] =
+{
+ 31, 4, 1, 0
+};
+
+static const unsigned char 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
+};
+
+inline void YM2612_Special_Update() { }
+
+struct Ym2612_Impl
+{
+ enum { channel_count = Ym2612_Emu::channel_count };
+
+ state_t YM2612;
+ int mute_mask;
+ tables_t g;
+
+ void KEY_ON( channel_t&, int );
+ void KEY_OFF( channel_t&, int );
+ int SLOT_SET( int, int );
+ int CHANNEL_SET( int, int );
+ int YM_SET( int, int );
+
+ void set_rate( double sample_rate, double clock_factor );
+ void reset();
+ void write0( int addr, int data );
+ void write1( int addr, int data );
+ void run_timer( int );
+ void run( int pair_count, Ym2612_Emu::sample_t* );
+};
+
+void Ym2612_Impl::KEY_ON( channel_t& ch, int nsl)
+{
+ slot_t *SL = &(ch.SLOT [nsl]); // on recupere le bon pointeur de slot
+
+ if (SL->Ecurp == RELEASE) // la touche est-elle rel'chee ?
+ {
+ SL->Fcnt = 0;
+
+ // Fix Ecco 2 splash sound
+
+ SL->Ecnt = (g.DECAY_TO_ATTACK [g.ENV_TAB [SL->Ecnt >> ENV_LBITS]] + ENV_ATTACK) & SL->ChgEnM;
+ SL->ChgEnM = ~0;
+
+// SL->Ecnt = g.DECAY_TO_ATTACK [g.ENV_TAB [SL->Ecnt >> ENV_LBITS]] + ENV_ATTACK;
+// SL->Ecnt = 0;
+
+ SL->Einc = SL->EincA;
+ SL->Ecmp = ENV_DECAY;
+ SL->Ecurp = ATTACK;
+ }
+}
+
+
+void Ym2612_Impl::KEY_OFF(channel_t& ch, int nsl)
+{
+ slot_t *SL = &(ch.SLOT [nsl]); // on recupere le bon pointeur de slot
+
+ if (SL->Ecurp != RELEASE) // la touche est-elle appuyee ?
+ {
+ if (SL->Ecnt < ENV_DECAY) // attack phase ?
+ {
+ SL->Ecnt = (g.ENV_TAB [SL->Ecnt >> ENV_LBITS] << ENV_LBITS) + ENV_DECAY;
+ }
+
+ SL->Einc = SL->EincR;
+ SL->Ecmp = ENV_END;
+ SL->Ecurp = RELEASE;
+ }
+}
+
+
+int Ym2612_Impl::SLOT_SET( int Adr, int data )
+{
+ int nch = Adr & 3;
+ if ( nch == 3 )
+ return 1;
+
+ channel_t& ch = YM2612.CHANNEL [nch + (Adr & 0x100 ? 3 : 0)];
+ slot_t& sl = ch.SLOT [(Adr >> 2) & 3];
+
+ switch ( Adr & 0xF0 )
+ {
+ case 0x30:
+ if ( (sl.MUL = (data & 0x0F)) != 0 ) sl.MUL <<= 1;
+ else sl.MUL = 1;
+
+ sl.DT = (int*) g.DT_TAB [(data >> 4) & 7];
+
+ ch.SLOT [0].Finc = -1;
+
+ 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
+
+ break;
+
+ case 0x50:
+ sl.KSR_S = 3 - (data >> 6);
+
+ ch.SLOT [0].Finc = -1;
+
+ if (data &= 0x1F) sl.AR = (int*) &g.AR_TAB [data << 1];
+ else sl.AR = (int*) &g.NULL_RATE [0];
+
+ sl.EincA = sl.AR [sl.KSR];
+ if (sl.Ecurp == ATTACK) sl.Einc = sl.EincA;
+ break;
+
+ case 0x60:
+ if ( (sl.AMSon = (data & 0x80)) != 0 ) sl.AMS = ch.AMS;
+ else sl.AMS = 31;
+
+ if (data &= 0x1F) sl.DR = (int*) &g.DR_TAB [data << 1];
+ else sl.DR = (int*) &g.NULL_RATE [0];
+
+ sl.EincD = sl.DR [sl.KSR];
+ if (sl.Ecurp == DECAY) sl.Einc = sl.EincD;
+ break;
+
+ case 0x70:
+ if (data &= 0x1F) sl.SR = (int*) &g.DR_TAB [data << 1];
+ else sl.SR = (int*) &g.NULL_RATE [0];
+
+ sl.EincS = sl.SR [sl.KSR];
+ if ((sl.Ecurp == SUBSTAIN) && (sl.Ecnt < ENV_END)) sl.Einc = sl.EincS;
+ break;
+
+ case 0x80:
+ sl.SLL = g.SL_TAB [data >> 4];
+
+ sl.RR = (int*) &g.DR_TAB [((data & 0xF) << 2) + 2];
+
+ sl.EincR = sl.RR [sl.KSR];
+ if ((sl.Ecurp == RELEASE) && (sl.Ecnt < ENV_END)) sl.Einc = sl.EincR;
+ 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 */
+
+ set_seg( sl, (data & 8) ? (data & 0x0F) : 0 );
+ break;
+ }
+
+ return 0;
+}
+
+
+int Ym2612_Impl::CHANNEL_SET( int Adr, int data )
+{
+ int num = Adr & 3;
+ if ( num == 3 )
+ return 1;
+
+ channel_t& ch = YM2612.CHANNEL [num + (Adr & 0x100 ? 3 : 0)];
+
+ switch ( Adr & 0xFC )
+ {
+ case 0xA0:
+ 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;
+ break;
+
+ case 0xA4:
+ YM2612_Special_Update();
+
+ ch.FNUM [0] = (ch.FNUM [0] & 0x0FF) + ((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;
+ 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;
+ }
+ break;
+
+ case 0xAC:
+ if ( Adr < 0x100 )
+ {
+ num++;
+
+ YM2612_Special_Update();
+
+ YM2612.CHANNEL [2].FNUM [num] = (YM2612.CHANNEL [2].FNUM [num] & 0x0FF) + ((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;
+ }
+ break;
+
+ case 0xB0:
+ 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;
+ break;
+
+ case 0xB4: {
+ YM2612_Special_Update();
+
+ ch.LEFT = 0 - ((data >> 7) & 1);
+ ch.RIGHT = 0 - ((data >> 6) & 1);
+
+ ch.AMS = LFO_AMS_TAB [(data >> 4) & 3];
+ ch.FMS = LFO_FMS_TAB [data & 7];
+
+ for ( int i = 0; i < 4; i++ )
+ {
+ slot_t& sl = ch.SLOT [i];
+ sl.AMS = (sl.AMSon ? ch.AMS : 31);
+ }
+ break;
+ }
+ }
+
+ return 0;
+}
+
+
+int Ym2612_Impl::YM_SET(int Adr, int data)
+{
+ switch ( Adr )
+ {
+ case 0x22:
+ if (data & 8) // LFO enable
+ {
+ // Cool Spot music 1, LFO modified severals time which
+ // distord the sound, have to check that on a real genesis...
+
+ g.LFOinc = g.LFO_INC_TAB [data & 7];
+ }
+ else
+ {
+ g.LFOinc = g.LFOcnt = 0;
+ }
+ break;
+
+ case 0x24:
+ YM2612.TimerA = (YM2612.TimerA & 0x003) | (((int) data) << 2);
+
+ if (YM2612.TimerAL != (1024 - YM2612.TimerA) << 12)
+ {
+ YM2612.TimerAcnt = YM2612.TimerAL = (1024 - YM2612.TimerA) << 12;
+ }
+ break;
+
+ case 0x25:
+ YM2612.TimerA = (YM2612.TimerA & 0x3FC) | (data & 3);
+
+ if (YM2612.TimerAL != (1024 - YM2612.TimerA) << 12)
+ {
+ YM2612.TimerAcnt = YM2612.TimerAL = (1024 - YM2612.TimerA) << 12;
+ }
+ break;
+
+ case 0x26:
+ YM2612.TimerB = data;
+
+ if (YM2612.TimerBL != (256 - YM2612.TimerB) << (4 + 12))
+ {
+ YM2612.TimerBcnt = YM2612.TimerBL = (256 - YM2612.TimerB) << (4 + 12);
+ }
+ break;
+
+ case 0x27:
+ // Parametre 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) & 0x40)
+ {
+ // 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.Status & 2)) YM2612.TimerBcnt = YM2612.TimerBL;
+// if ((data & 1) && (YM2612.Status & 1)) YM2612.TimerAcnt = YM2612.TimerAL;
+
+// YM2612.Status &= (~data >> 4); // Reset du Status au cas ou c'est demande
+ YM2612.Status &= (~data >> 4) & (data >> 2); // Reset Status
+
+ YM2612.Mode = data;
+ break;
+
+ case 0x28: {
+ int nch = data & 3;
+ if ( nch == 3 )
+ return 1;
+ if ( data & 4 )
+ nch += 3;
+ channel_t& 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 rel'che 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 rel'che 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 rel'che 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 rel'che la touche pour le slot 4
+ break;
+ }
+
+ case 0x2B:
+ if (YM2612.DAC ^ (data & 0x80)) YM2612_Special_Update();
+
+ YM2612.DAC = data & 0x80; // activation/desactivation du DAC
+ break;
+ }
+
+ return 0;
+}
+
+void Ym2612_Impl::set_rate( double sample_rate, double clock_rate )
+{
+ assert( sample_rate );
+ assert( clock_rate > sample_rate );
+
+ int i;
+
+ // 144 = 12 * (prescale * 2) = 12 * 6 * 2
+ // prescale set to 6 by default
+
+ double Frequence = clock_rate / sample_rate / 144.0;
+ if ( fabs( Frequence - 1.0 ) < 0.0000001 )
+ Frequence = 1.0;
+ YM2612.TimerBase = int (Frequence * 4096.0);
+
+ // 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 ?)
+ {
+ g.TL_TAB [TL_LENGHT + i] = g.TL_TAB [i] = 0;
+ }
+ else
+ {
+ double x = MAX_OUT; // Max output
+ x /= pow( 10.0, (ENV_STEP * i) / 20.0 ); // Decibel -> Voltage
+
+ g.TL_TAB [i] = (int) x;
+ g.TL_TAB [TL_LENGHT + i] = -g.TL_TAB [i];
+ }
+ }
+
+ // Tableau SIN :
+ // g.SIN_TAB [x] [y] = sin(x) * y;
+ // x = phase and y = volume
+
+ g.SIN_TAB [0] = g.SIN_TAB [SIN_LENGHT / 2] = PG_CUT_OFF;
+
+ for(i = 1; i <= SIN_LENGHT / 4; i++)
+ {
+ double x = sin(2.0 * PI * (double) (i) / (double) (SIN_LENGHT)); // Sinus
+ x = 20 * log10(1 / x); // convert to dB
+
+ int j = (int) (x / ENV_STEP); // Get TL range
+
+ if (j > PG_CUT_OFF) j = (int) PG_CUT_OFF;
+
+ g.SIN_TAB [i] = g.SIN_TAB [(SIN_LENGHT / 2) - i] = j;
+ g.SIN_TAB [(SIN_LENGHT / 2) + i] = g.SIN_TAB [SIN_LENGHT - i] = TL_LENGHT + j;
+ }
+
+ // Tableau LFO (LFO wav) :
+
+ for(i = 0; i < LFO_LENGHT; i++)
+ {
+ double 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
+
+ g.LFO_ENV_TAB [i] = (int) x;
+
+ x = sin(2.0 * PI * (double) (i) / (double) (LFO_LENGHT)); // Sinus
+ x *= (double) ((1 << (LFO_HBITS - 1)) - 1);
+
+ g.LFO_FREQ_TAB [i] = (int) x;
+
+ }
+
+ // Tableau Enveloppe :
+ // g.ENV_TAB [0] -> g.ENV_TAB [ENV_LENGHT - 1] = attack curve
+ // g.ENV_TAB [ENV_LENGHT] -> g.ENV_TAB [2 * ENV_LENGHT - 1] = decay curve
+
+ for(i = 0; i < ENV_LENGHT; i++)
+ {
+ // Attack curve (x^8 - music level 2 Vectorman 2)
+ double x = pow(((double) ((ENV_LENGHT - 1) - i) / (double) (ENV_LENGHT)), 8);
+ x *= ENV_LENGHT;
+
+ g.ENV_TAB [i] = (int) x;
+
+ // Decay curve (just linear)
+ x = pow(((double) (i) / (double) (ENV_LENGHT)), 1);
+ x *= ENV_LENGHT;
+
+ g.ENV_TAB [ENV_LENGHT + i] = (int) x;
+ }
+ for ( i = 0; i < 8; i++ )
+ g.ENV_TAB [i + ENV_LENGHT * 2] = 0;
+
+ g.ENV_TAB [ENV_END >> ENV_LBITS] = ENV_LENGHT - 1; // for the stopped state
+
+ // Tableau pour la conversion Attack -> Decay and Decay -> Attack
+
+ int j = ENV_LENGHT - 1;
+ for ( i = 0; i < ENV_LENGHT; i++ )
+ {
+ while ( j && g.ENV_TAB [j] < i )
+ j--;
+
+ g.DECAY_TO_ATTACK [i] = j << ENV_LBITS;
+ }
+
+ // Tableau pour le Substain Level
+
+ for(i = 0; i < 15; i++)
+ {
+ double x = i * 3; // 3 and not 6 (Mickey Mania first music for test)
+ x /= ENV_STEP;
+
+ g.SL_TAB [i] = ((int) x << ENV_LBITS) + ENV_DECAY;
+ }
+
+ g.SL_TAB [15] = ((ENV_LENGHT - 1) << ENV_LBITS) + ENV_DECAY; // special case : volume off
+
+ // Tableau Frequency Step
+
+ for(i = 0; i < 2048; i++)
+ {
+ double x = (double) (i) * 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
+
+ g.FINC_TAB [i] = (unsigned int) x;
+ }
+
+ // Tableaux Attack & Decay Rate
+
+ for(i = 0; i < 4; i++)
+ {
+ g.AR_TAB [i] = 0;
+ g.DR_TAB [i] = 0;
+ }
+
+ for(i = 0; i < 60; i++)
+ {
+ double x = 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 g.ENV_TAB
+
+ g.AR_TAB [i + 4] = (unsigned int) (x / AR_RATE);
+ g.DR_TAB [i + 4] = (unsigned int) (x / DR_RATE);
+ }
+
+ for(i = 64; i < 96; i++)
+ {
+ g.AR_TAB [i] = g.AR_TAB [63];
+ g.DR_TAB [i] = g.DR_TAB [63];
+
+ g.NULL_RATE [i - 64] = 0;
+ }
+
+ for ( i = 96; i < 128; i++ )
+ g.AR_TAB [i] = 0;
+
+ // Tableau Detune
+
+ for(i = 0; i < 4; i++)
+ {
+ for (int j = 0; j < 32; j++)
+ {
+#if ((SIN_LBITS + SIN_HBITS - 21) < 0)
+ double y = (double) DT_DEF_TAB [(i << 5) + j] * Frequence / (double) (1 << (21 - SIN_LBITS - SIN_HBITS));
+#else
+ double y = (double) DT_DEF_TAB [(i << 5) + j] * Frequence * (double) (1 << (SIN_LBITS + SIN_HBITS - 21));
+#endif
+
+ g.DT_TAB [i + 0] [j] = (int) y;
+ g.DT_TAB [i + 4] [j] = (int) -y;
+ }
+ }
+
+ // Tableau LFO
+ g.LFO_INC_TAB [0] = (unsigned int) (3.98 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / sample_rate);
+ g.LFO_INC_TAB [1] = (unsigned int) (5.56 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / sample_rate);
+ g.LFO_INC_TAB [2] = (unsigned int) (6.02 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / sample_rate);
+ g.LFO_INC_TAB [3] = (unsigned int) (6.37 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / sample_rate);
+ g.LFO_INC_TAB [4] = (unsigned int) (6.88 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / sample_rate);
+ g.LFO_INC_TAB [5] = (unsigned int) (9.63 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / sample_rate);
+ g.LFO_INC_TAB [6] = (unsigned int) (48.1 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / sample_rate);
+ g.LFO_INC_TAB [7] = (unsigned int) (72.2 * (double) (1 << (LFO_HBITS + LFO_LBITS)) / sample_rate);
+
+ reset();
+}
+
+const char* Ym2612_Emu::set_rate( double sample_rate, double clock_rate )
+{
+ if ( !impl )
+ {
+ impl = (Ym2612_Impl*) malloc( sizeof *impl );
+ if ( !impl )
+ return "Out of memory";
+ impl->mute_mask = 0;
+ }
+ memset( &impl->YM2612, 0, sizeof impl->YM2612 );
+
+ impl->set_rate( sample_rate, clock_rate );
+
+ return 0;
+}
+
+Ym2612_Emu::~Ym2612_Emu()
+{
+ free( impl );
+}
+
+inline void Ym2612_Impl::write0( int opn_addr, int data )
+{
+ assert( (unsigned) data <= 0xFF );
+
+ if ( opn_addr < 0x30 )
+ {
+ YM2612.REG [0] [opn_addr] = data;
+ YM_SET( opn_addr, data );
+ }
+ else if ( YM2612.REG [0] [opn_addr] != data )
+ {
+ YM2612.REG [0] [opn_addr] = data;
+
+ if ( opn_addr < 0xA0 )
+ SLOT_SET( opn_addr, data );
+ else
+ CHANNEL_SET( opn_addr, data );
+ }
+}
+
+inline void Ym2612_Impl::write1( int opn_addr, int data )
+{
+ assert( (unsigned) data <= 0xFF );
+
+ if ( opn_addr >= 0x30 && YM2612.REG [1] [opn_addr] != data )
+ {
+ YM2612.REG [1] [opn_addr] = data;
+
+ if ( opn_addr < 0xA0 )
+ SLOT_SET( opn_addr + 0x100, data );
+ else
+ CHANNEL_SET( opn_addr + 0x100, data );
+ }
+}
+
+void Ym2612_Emu::reset()
+{
+ impl->reset();
+}
+
+void Ym2612_Impl::reset()
+{
+ g.LFOcnt = 0;
+ YM2612.TimerA = 0;
+ YM2612.TimerAL = 0;
+ YM2612.TimerAcnt = 0;
+ YM2612.TimerB = 0;
+ YM2612.TimerBL = 0;
+ YM2612.TimerBcnt = 0;
+ YM2612.DAC = 0;
+
+ YM2612.Status = 0;
+
+ int i;
+ for ( i = 0; i < channel_count; i++ )
+ {
+ channel_t& ch = YM2612.CHANNEL [i];
+
+ ch.LEFT = ~0;
+ ch.RIGHT = ~0;
+ ch.ALGO = 0;
+ ch.FB = 31;
+ ch.FMS = 0;
+ ch.AMS = 0;
+
+ for ( int j = 0 ;j < 4 ; j++ )
+ {
+ ch.S0_OUT [j] = 0;
+ ch.FNUM [j] = 0;
+ ch.FOCT [j] = 0;
+ ch.KC [j] = 0;
+
+ ch.SLOT [j].Fcnt = 0;
+ ch.SLOT [j].Finc = 0;
+ ch.SLOT [j].Ecnt = ENV_END; // Put it at the end of Decay phase...
+ ch.SLOT [j].Einc = 0;
+ ch.SLOT [j].Ecmp = 0;
+ ch.SLOT [j].Ecurp = RELEASE;
+
+ ch.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-- )
+ {
+ write0( i, 0xC0 );
+ write1( i, 0xC0 );
+ }
+
+ for ( i = 0xB2; i >= 0x22; i-- )
+ {
+ write0( i, 0 );
+ write1( i, 0 );
+ }
+
+ write0( 0x2A, 0x80 );
+}
+
+void Ym2612_Emu::write0( int addr, int data )
+{
+ impl->write0( addr, data );
+}
+
+void Ym2612_Emu::write1( int addr, int data )
+{
+ impl->write1( addr, data );
+}
+
+void Ym2612_Emu::mute_voices( int mask ) { impl->mute_mask = mask; }
+
+static void update_envelope_( slot_t* sl )
+{
+ switch ( sl->Ecurp )
+ {
+ case 0:
+ // Env_Attack_Next
+
+ // Verified with Gynoug even in HQ (explode SFX)
+ sl->Ecnt = ENV_DECAY;
+
+ sl->Einc = sl->EincD;
+ sl->Ecmp = sl->SLL;
+ sl->Ecurp = DECAY;
+ break;
+
+ case 1:
+ // Env_Decay_Next
+
+ // Verified with Gynoug even in HQ (explode SFX)
+ sl->Ecnt = sl->SLL;
+
+ sl->Einc = sl->EincS;
+ sl->Ecmp = ENV_END;
+ sl->Ecurp = SUBSTAIN;
+ break;
+
+ case 2:
+ // Env_Substain_Next(slot_t *SL)
+ if (sl->SEG & 8) // SSG envelope type
+ {
+ int release = sl->SEG & 1;
+
+ if ( !release )
+ {
+ // re KEY ON
+
+ // sl->Fcnt = 0;
+ // sl->ChgEnM = ~0;
+
+ sl->Ecnt = 0;
+ sl->Einc = sl->EincA;
+ sl->Ecmp = ENV_DECAY;
+ sl->Ecurp = ATTACK;
+ }
+
+ set_seg( *sl, (sl->SEG << 1) & 4 );
+
+ if ( !release )
+ break;
+ }
+ // fall through
+
+ case 3:
+ // Env_Release_Next
+ sl->Ecnt = ENV_END;
+ sl->Einc = 0;
+ sl->Ecmp = ENV_END + 1;
+ break;
+
+ // default: no op
+ }
+}
+
+inline void update_envelope( slot_t& sl )
+{
+ int ecmp = sl.Ecmp;
+ if ( (sl.Ecnt += sl.Einc) >= ecmp )
+ update_envelope_( &sl );
+}
+
+template<int algo>
+struct ym2612_update_chan {
+ static void func( tables_t&, channel_t&, Ym2612_Emu::sample_t*, int );
+};
+
+typedef void (*ym2612_update_chan_t)( tables_t&, channel_t&, Ym2612_Emu::sample_t*, int );
+
+template<int algo>
+void ym2612_update_chan<algo>::func( tables_t& g, channel_t& ch,
+ Ym2612_Emu::sample_t* buf, int length )
+{
+ int not_end = ch.SLOT [S3].Ecnt - ENV_END;
+
+ // algo is a compile-time constant, so all conditions based on it are resolved
+ // during compilation
+
+ // special cases
+ if ( algo == 7 )
+ not_end |= ch.SLOT [S0].Ecnt - ENV_END;
+
+ if ( algo >= 5 )
+ not_end |= ch.SLOT [S2].Ecnt - ENV_END;
+
+ if ( algo >= 4 )
+ not_end |= ch.SLOT [S1].Ecnt - ENV_END;
+
+ int CH_S0_OUT_1 = ch.S0_OUT [1];
+
+ int in0 = ch.SLOT [S0].Fcnt;
+ int in1 = ch.SLOT [S1].Fcnt;
+ int in2 = ch.SLOT [S2].Fcnt;
+ int in3 = ch.SLOT [S3].Fcnt;
+
+ int YM2612_LFOinc = g.LFOinc;
+ int YM2612_LFOcnt = g.LFOcnt + YM2612_LFOinc;
+
+ if ( !not_end )
+ return;
+
+ do
+ {
+ // envelope
+ int const env_LFO = g.LFO_ENV_TAB [YM2612_LFOcnt >> LFO_LBITS & LFO_MASK];
+
+ short const* const ENV_TAB = g.ENV_TAB;
+
+ #define CALC_EN( x ) \
+ int temp##x = ENV_TAB [ch.SLOT [S##x].Ecnt >> ENV_LBITS] + ch.SLOT [S##x].TLL; \
+ int en##x = ((temp##x ^ ch.SLOT [S##x].env_xor) + (env_LFO >> ch.SLOT [S##x].AMS)) & \
+ ((temp##x - ch.SLOT [S##x].env_max) >> 31);
+
+ CALC_EN( 0 )
+ CALC_EN( 1 )
+ CALC_EN( 2 )
+ CALC_EN( 3 )
+
+ int const* const TL_TAB = g.TL_TAB;
+
+ #define SINT( i, o ) (TL_TAB [g.SIN_TAB [(i)] + (o)])
+
+ // feedback
+ int CH_S0_OUT_0 = ch.S0_OUT [0];
+ {
+ int temp = in0 + ((CH_S0_OUT_0 + CH_S0_OUT_1) >> ch.FB);
+ CH_S0_OUT_1 = CH_S0_OUT_0;
+ CH_S0_OUT_0 = SINT( (temp >> SIN_LBITS) & SIN_MASK, en0 );
+ }
+
+ int CH_OUTd;
+ if ( algo == 0 )
+ {
+ int temp = in1 + CH_S0_OUT_1;
+ temp = in2 + SINT( (temp >> SIN_LBITS) & SIN_MASK, en1 );
+ temp = in3 + SINT( (temp >> SIN_LBITS) & SIN_MASK, en2 );
+ CH_OUTd = SINT( (temp >> SIN_LBITS) & SIN_MASK, en3 );
+ }
+ else if ( algo == 1 )
+ {
+ int temp = in2 + CH_S0_OUT_1 + SINT( (in1 >> SIN_LBITS) & SIN_MASK, en1 );
+ temp = in3 + SINT( (temp >> SIN_LBITS) & SIN_MASK, en2 );
+ CH_OUTd = SINT( (temp >> SIN_LBITS) & SIN_MASK, en3 );
+ }
+ else if ( algo == 2 )
+ {
+ int temp = in2 + SINT( (in1 >> SIN_LBITS) & SIN_MASK, en1 );
+ temp = in3 + CH_S0_OUT_1 + SINT( (temp >> SIN_LBITS) & SIN_MASK, en2 );
+ CH_OUTd = SINT( (temp >> SIN_LBITS) & SIN_MASK, en3 );
+ }
+ else if ( algo == 3 )
+ {
+ int temp = in1 + CH_S0_OUT_1;
+ temp = in3 + SINT( (temp >> SIN_LBITS) & SIN_MASK, en1 ) +
+ SINT( (in2 >> SIN_LBITS) & SIN_MASK, en2 );
+ CH_OUTd = SINT( (temp >> SIN_LBITS) & SIN_MASK, en3 );
+ }
+ else if ( algo == 4 )
+ {
+ int temp = in3 + SINT( (in2 >> SIN_LBITS) & SIN_MASK, en2 );
+ CH_OUTd = SINT( (temp >> SIN_LBITS) & SIN_MASK, en3 ) +
+ SINT( ((in1 + CH_S0_OUT_1) >> SIN_LBITS) & SIN_MASK, en1 );
+ //DO_LIMIT
+ }
+ else if ( algo == 5 )
+ {
+ int temp = CH_S0_OUT_1;
+ CH_OUTd = SINT( ((in3 + temp) >> SIN_LBITS) & SIN_MASK, en3 ) +
+ SINT( ((in1 + temp) >> SIN_LBITS) & SIN_MASK, en1 ) +
+ SINT( ((in2 + temp) >> SIN_LBITS) & SIN_MASK, en2 );
+ //DO_LIMIT
+ }
+ else if ( algo == 6 )
+ {
+ CH_OUTd = SINT( (in3 >> SIN_LBITS) & SIN_MASK, en3 ) +
+ SINT( ((in1 + CH_S0_OUT_1) >> SIN_LBITS) & SIN_MASK, en1 ) +
+ SINT( (in2 >> SIN_LBITS) & SIN_MASK, en2 );
+ //DO_LIMIT
+ }
+ else if ( algo == 7 )
+ {
+ CH_OUTd = SINT( (in3 >> SIN_LBITS) & SIN_MASK, en3 ) +
+ SINT( (in1 >> SIN_LBITS) & SIN_MASK, en1 ) +
+ SINT( (in2 >> SIN_LBITS) & SIN_MASK, en2 ) + CH_S0_OUT_1;
+ //DO_LIMIT
+ }
+
+ CH_OUTd >>= MAX_OUT_BITS - output_bits + 2;
+
+ // update phase
+ unsigned freq_LFO = ((g.LFO_FREQ_TAB [YM2612_LFOcnt >> LFO_LBITS & LFO_MASK] *
+ ch.FMS) >> (LFO_HBITS - 1 + 1)) + (1L << (LFO_FMS_LBITS - 1));
+ YM2612_LFOcnt += YM2612_LFOinc;
+ in0 += (ch.SLOT [S0].Finc * freq_LFO) >> (LFO_FMS_LBITS - 1);
+ in1 += (ch.SLOT [S1].Finc * freq_LFO) >> (LFO_FMS_LBITS - 1);
+ in2 += (ch.SLOT [S2].Finc * freq_LFO) >> (LFO_FMS_LBITS - 1);
+ in3 += (ch.SLOT [S3].Finc * freq_LFO) >> (LFO_FMS_LBITS - 1);
+
+ int t0 = buf [0] + (CH_OUTd & ch.LEFT);
+ int t1 = buf [1] + (CH_OUTd & ch.RIGHT);
+
+ update_envelope( ch.SLOT [0] );
+ update_envelope( ch.SLOT [1] );
+ update_envelope( ch.SLOT [2] );
+ update_envelope( ch.SLOT [3] );
+
+ ch.S0_OUT [0] = CH_S0_OUT_0;
+ buf [0] = t0;
+ buf [1] = t1;
+ buf += 2;
+ }
+ while ( --length );
+
+ ch.S0_OUT [1] = CH_S0_OUT_1;
+
+ ch.SLOT [S0].Fcnt = in0;
+ ch.SLOT [S1].Fcnt = in1;
+ ch.SLOT [S2].Fcnt = in2;
+ ch.SLOT [S3].Fcnt = in3;
+}
+
+static const ym2612_update_chan_t UPDATE_CHAN [8] = {
+ &ym2612_update_chan<0>::func,
+ &ym2612_update_chan<1>::func,
+ &ym2612_update_chan<2>::func,
+ &ym2612_update_chan<3>::func,
+ &ym2612_update_chan<4>::func,
+ &ym2612_update_chan<5>::func,
+ &ym2612_update_chan<6>::func,
+ &ym2612_update_chan<7>::func
+};
+
+void Ym2612_Impl::run_timer( int length )
+{
+ int const step = 6;
+ int remain = length;
+ do
+ {
+ int n = step;
+ if ( n > remain )
+ n = remain;
+ remain -= n;
+
+ long i = n * YM2612.TimerBase;
+ if (YM2612.Mode & 1) // Timer A ON ?
+ {
+ // if ((YM2612.TimerAcnt -= 14073) <= 0) // 13879=NTSC (old: 14475=NTSC 14586=PAL)
+ if ((YM2612.TimerAcnt -= i) <= 0)
+ {
+ // timer a overflow
+
+ YM2612.Status |= (YM2612.Mode & 0x04) >> 2;
+ YM2612.TimerAcnt += YM2612.TimerAL;
+
+ if (YM2612.Mode & 0x80)
+ {
+ KEY_ON( YM2612.CHANNEL [2], 0 );
+ KEY_ON( YM2612.CHANNEL [2], 1 );
+ KEY_ON( YM2612.CHANNEL [2], 2 );
+ KEY_ON( YM2612.CHANNEL [2], 3 );
+ }
+ }
+ }
+
+ if (YM2612.Mode & 2) // Timer B ON ?
+ {
+ // if ((YM2612.TimerBcnt -= 14073) <= 0) // 13879=NTSC (old: 14475=NTSC 14586=PAL)
+ if ((YM2612.TimerBcnt -= i) <= 0)
+ {
+ // timer b overflow
+ YM2612.Status |= (YM2612.Mode & 0x08) >> 2;
+ YM2612.TimerBcnt += YM2612.TimerBL;
+ }
+ }
+ }
+ while ( remain > 0 );
+}
+
+void Ym2612_Impl::run( int pair_count, Ym2612_Emu::sample_t* out )
+{
+ if ( pair_count <= 0 )
+ return;
+
+ if ( YM2612.Mode & 3 )
+ run_timer( pair_count );
+
+ // Mise à jour des pas des compteurs-frequences s'ils ont ete modifies
+
+ for ( int chi = 0; chi < channel_count; chi++ )
+ {
+ channel_t& ch = YM2612.CHANNEL [chi];
+ if ( ch.SLOT [0].Finc != -1 )
+ continue;
+
+ int i2 = 0;
+ if ( chi == 2 && (YM2612.Mode & 0x40) )
+ i2 = 2;
+
+ for ( int i = 0; i < 4; i++ )
+ {
+ // static int seq [4] = { 2, 1, 3, 0 };
+ // if ( i2 ) i2 = seq [i];
+
+ slot_t& sl = ch.SLOT [i];
+ int finc = g.FINC_TAB [ch.FNUM [i2]] >> (7 - ch.FOCT [i2]);
+ int ksr = ch.KC [i2] >> sl.KSR_S; // keycode attenuation
+ sl.Finc = (finc + sl.DT [ch.KC [i2]]) * sl.MUL;
+ if (sl.KSR != ksr) // si le KSR a change alors
+ { // les differents 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 ( i2 )
+ i2 = (i2 ^ 2) ^ (i2 >> 1);
+ }
+ }
+
+ for ( int i = 0; i < channel_count; i++ )
+ {
+ if ( !(mute_mask & (1 << i)) && (i != 5 || !YM2612.DAC) )
+ UPDATE_CHAN [YM2612.CHANNEL [i].ALGO]( g, YM2612.CHANNEL [i], out, pair_count );
+ }
+
+ g.LFOcnt += g.LFOinc * pair_count;
+}
+
+void Ym2612_Emu::run( int pair_count, sample_t* out ) { impl->run( pair_count, out ); }
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-02 16:01:00 +0000