--- /dev/null
+//
+// Jarek Burczynski's YM2151 emulator
+//
+// Cleaned of most MAMEisms & cleaned up in general by James Hammons
+// (this is mostly a placeholder until I write my own)
+//
+
+#include "ym2151.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <stdint.h>
+
+
+// Missing shit (from M.A.M.E.)
+
+#if 1
+#define PI 3.1415629535897932338
+static FILE * errorlog = 0;
+//int cpu_scalebyfcount(int);
+//void timer_remove(void *);
+//void * timer_set(int, int, void (*)(int));
+
+// Bogus M.A.M.E. shite
+int cpu_scalebyfcount(int f) { return f; }
+void timer_remove(void * foo) { printf("STUB: timer_remove()\n"); }
+void * timer_set(int foo, int bar, void (* baz)(int)) { printf("STUB: timer_set()\n"); return 0; }
+
+#endif
+
+
+/*
+** some globals ...
+*/
+
+/*
+** Shifts below are subject to change if sampling frequency changes...
+*/
+#define FREQ_SH 16 /* 16.16 fixed point for frequency calculations */
+#define LFO_SH 24 /* 8.24 fixed point for LFO frequency calculations */
+#define ENV_SH 16 /* 16.16 fixed point for envelope calculations */
+#define TIMER_SH 16 /* 16.16 fixed point for timers calculations */
+
+#define ENV_BITS 10
+#define ENV_RES ((int)1<<ENV_BITS)
+#define ENV_STEP (96.0/ENV_RES)
+#define MAX_VOLUME_INDEX ((ENV_RES-1)<<ENV_SH)
+#define MIN_VOLUME_INDEX (0)
+#define VOLUME_OFF (ENV_RES<<ENV_SH)
+
+#define SIN_BITS 10
+#define SIN_LEN ((int)1<<SIN_BITS)
+#define SIN_MASK (SIN_LEN-1)
+
+#define FINAL_SH8 7 /*this shift is applied to final output of all channels to get 8-bit sample */
+#define FINAL_SH16 0 /*this shift is applied to final output of all channels to get 16-bit sample*/
+
+static uint8_t FEED[8] = {0,7,6,5,4,3,2,1}; /*shifts (divider) for output of op.0 which feeds into itself*/
+
+#define TL_TAB_LEN (2*(ENV_RES + ENV_RES + ENV_RES + SIN_LEN))
+static signed int * TL_TAB = NULL;
+/*
+ * Offset in this table is calculated as:
+ *
+ * 1st ENV_RES:
+ * TL- main offset (Total attenuation Level), range 0 to 1023 (0-96 dB)
+ * 2nd ENV_RES:
+ * current envelope value of the operator, range 0 to 1023 (0-96 dB)
+ * 3rd ENV_RES:
+ * Amplitude Modulation from LFO, range 0 to 1023 (0-96dB)
+ * 4th SIN_LEN:
+ * Sin Wave Offset from sin_tab, range 0 to about 56 dB only, but lets
+ * simplify things and assume sin could be 96 dB, range 0 to 1023
+ *
+ * Length of this table is doubled because we have two separate parts
+ * for positive and negative halves of sin wave (above and below X axis).
+ */
+
+static signed int * sin_tab[SIN_LEN]; /* sin waveform table in decibel scale */
+
+#if 0
+/*tables below are defined for usage by LFO */
+signed int PMsaw [SIN_LEN]; /*saw waveform table PM */
+signed int PMsquare [SIN_LEN]; /*square waveform table PM */
+signed int PMtriangle[SIN_LEN]; /*triangle waveform table PM */
+signed int PMnoise [SIN_LEN]; /*noise waveform table PM */
+
+uint16_t AMsaw [SIN_LEN]; /*saw waveform table AM */
+uint16_t AMsquare [SIN_LEN]; /*square waveform table AM */
+uint16_t AMtriangle[SIN_LEN]; /*triangle waveform table AM */
+uint16_t AMnoise [SIN_LEN]; /*noise waveform table AM */
+#endif
+
+static int YM2151_CLOCK = 1; /* this will be passed from 2151intf.c */
+static int YM2151_SAMPFREQ = 1; /* this will be passed from 2151intf.c */
+//static uint8_t sample_16bit; /* 1 -> 16 bit sample, 0 -> 8 bit */
+
+static int YMBufSize; /* size of sound buffer, in samples */
+static int YMNumChips; /* total # of YM's emulated */
+
+static int TimerA[1024];
+static int TimerB[256];
+
+/* ASG 980324: added */
+static double TimerATime[1024];
+static double TimerBTime[256];
+
+static YM2151 * YMPSG = NULL; /* array of YM's */
+
+signed int * BuffTemp = NULL; /*temporary buffer for speedup purposes*/
+
+static void (* envelope_calc[5])(OscilRec *);
+static void (* register_writes[256])(uint8_t, uint8_t, uint8_t);
+
+//save output as raw 16-bit sample - just in case you would like to listen to it offline ;-)
+//#define SAVE_SAMPLE
+//#define SAVE_SEPARATE_CHANNELS
+
+#ifdef SAVE_SAMPLE
+#ifdef SAVE_SEPARATE_CHANNELS
+FILE * sample1;
+FILE * sample2;
+FILE * sample3;
+FILE * sample4;
+FILE * sample5;
+FILE * sample6;
+#endif
+FILE * samplesum;
+#endif
+
+int PMTab[8]; /*8 channels */
+/* this table is used for PM setup of LFO */
+
+int AMTab[8]; /*8 channels */
+/* this table is used for AM setup of LFO */
+
+static int decib45[16];
+/*decibel table to convert from D1L values to index in lookup table*/
+
+static int attack_curve[ENV_RES];
+
+unsigned int divia[64]; //Attack dividers
+unsigned int divid[64]; //Decay dividers
+static unsigned int A_DELTAS[64+31]; //Attack deltas (64 keycodes + 31 RKS's = 95)
+static unsigned int D_DELTAS[64+31]; //Decay deltas (64 keycodes + 31 RKS's = 95)
+
+float DT1Tab[32][4]={ /* 8 octaves * 4 key codes, 4 DT1 values */
+/*
+ * Table defines offset in Hertz from base frequency depending on KC and DT1
+ * User's Manual page 21
+*/
+/*OCT NOTE DT1=0 DT1=1 DT1=2 DT1=3*/
+/* 0 0*/{0, 0, 0.053, 0.107},
+/* 0 1*/{0, 0, 0.053, 0.107},
+/* 0 2*/{0, 0, 0.053, 0.107},
+/* 0 3*/{0, 0, 0.053, 0.107},
+/* 1 0*/{0, 0.053, 0.107, 0.107},
+/* 1 1*/{0, 0.053, 0.107, 0.160},
+/* 1 2*/{0, 0.053, 0.107, 0.160},
+/* 1 3*/{0, 0.053, 0.107, 0.160},
+/* 2 0*/{0, 0.053, 0.107, 0.213},
+/* 2 1*/{0, 0.053, 0.160, 0.213},
+/* 2 2*/{0, 0.053, 0.160, 0.213},
+/* 2 3*/{0, 0.053, 0.160, 0.267},
+/* 3 0*/{0, 0.107, 0.213, 0.267},
+/* 3 1*/{0, 0.107, 0.213, 0.320},
+/* 3 2*/{0, 0.107, 0.213, 0.320},
+/* 3 3*/{0, 0.107, 0.267, 0.373},
+/* 4 0*/{0, 0.107, 0.267, 0.427},
+/* 4 1*/{0, 0.160, 0.320, 0.427},
+/* 4 2*/{0, 0.160, 0.320, 0.480},
+/* 4 3*/{0, 0.160, 0.373, 0.533},
+/* 5 0*/{0, 0.213, 0.427, 0.587},
+/* 5 1*/{0, 0.213, 0.427, 0.640},
+/* 5 2*/{0, 0.213, 0.480, 0.693},
+/* 5 3*/{0, 0.267, 0.533, 0.747},
+/* 6 0*/{0, 0.267, 0.587, 0.853},
+/* 6 1*/{0, 0.320, 0.640, 0.907},
+/* 6 2*/{0, 0.320, 0.693, 1.013},
+/* 6 3*/{0, 0.373, 0.747, 1.067},
+/* 7 0*/{0, 0.427, 0.853, 1.173},
+/* 7 1*/{0, 0.427, 0.907, 1.173},
+/* 7 2*/{0, 0.480, 1.013, 1.173},
+/* 7 3*/{0, 0.533, 1.067, 1.173}
+};
+
+static uint16_t DT2Tab[4]={ /* 4 DT2 values */
+/*
+ * DT2 defines offset in cents from base note
+ *
+ * The table below defines offset in deltas table...
+ * User's Manual page 22
+ * Values below were calculated using formula: value = orig.val / 1.5625
+ *
+ * DT2=0 DT2=1 DT2=2 DT2=3
+ * 0 600 781 950
+ */
+ 0, 384, 500, 608
+};
+
+static uint16_t KC_TO_INDEX[16*8]; /*16 note codes * 8 octaves */
+/*translate key code KC (OCT2 OCT1 OCT0 N3 N2 N1 N0) into index in deltas table*/
+
+static signed int DT1deltas[32][8];
+
+static signed int deltas[9*12*64];/*9 octaves, 12 semitones, 64 'cents' */
+/*deltas in sintable (fixed point) to get the closest frequency possible */
+/*there're 9 octaves because of DT2 (max 950 cents over base frequency) */
+
+static signed int LFOdeltas[256]; /*frequency deltas for LFO*/
+
+
+void sin_init(void)
+{
+ int x, i;
+ float m;
+
+ for(i=0; i<SIN_LEN; i++)
+ {
+ m = sin(2 * PI * i / SIN_LEN); /*count sin value*/
+
+ if ((m < 0.0001) && (m > -0.0001)) /*is m very close to zero ?*/
+ m = ENV_RES - 1;
+ else
+ {
+ if (m > 0.0)
+ {
+ m = 20 * log10(1.0 / m); /* and how many decibels is it? */
+ m = m / ENV_STEP;
+ }
+ else
+ {
+ m = 20 * log10(-1.0 / m); /* and how many decibels is it? */
+ m = (m / ENV_STEP) + TL_TAB_LEN / 2;
+ }
+ }
+
+ sin_tab[i] = &TL_TAB[(unsigned int)m]; /**/
+ //if (errorlog) fprintf(errorlog,"sin %i = %i\n",i,sin_tab[i] );
+ }
+
+ for(x=0; x<TL_TAB_LEN/2; x++)
+ {
+ if (x < ENV_RES)
+ {
+ if ((x * ENV_STEP) < 6.0) /*have we passed 6 dB*/
+ { /*nope, we didn't */
+ m = ((1 << 12) - 1) / pow(10, x * ENV_STEP / 20);
+ }
+ else
+ {
+ /*if yes, we simplify things (and the real chip */
+ /*probably does it also) and assume that - 6dB */
+ /*halves the voltage (it _nearly_ does in fact) */
+ m = TL_TAB[(int)((float)x - (6.0 / ENV_STEP))] / 2;
+ }
+ }
+ else
+ {
+ m = 0;
+ }
+
+ TL_TAB[ x ] = m;
+ TL_TAB[x + TL_TAB_LEN / 2] = -m;
+ //if (errorlog) fprintf(errorlog,"tl %04i =%08x\n",x,TL_TAB[x]);
+ }
+
+/* create attack curve */
+ for(i=0; i<ENV_RES; i++)
+ {
+ m = (ENV_RES - 1) / pow(10, i * (48.0 / ENV_RES) / 20);
+ x = m * (1 << ENV_SH);
+ attack_curve[ENV_RES - 1 - i] = x;
+ //if (errorlog) fprintf(errorlog,"attack [%04x] = %08x Volt=%08x\n", ENV_RES-1-i, x/(1<<ENV_SH), TL_TAB[x/(1<<ENV_SH)] );
+ }
+
+ for(x=0; x<16; x++)
+ {
+ i = (x < 15 ? x : x + 16) * (3.0 / ENV_STEP); /*every 3 dB except for ALL '1' = 45dB+48dB*/
+ i <<= ENV_SH;
+ decib45[x] = i;
+ //if (errorlog) fprintf(errorlog,"decib45[%04x]=%08x\n",x,i );
+ }
+
+#ifdef SAVE_SAMPLE
+#ifdef SAVE_SEPARATE_CHANNELS
+sample1=fopen("samp.raw","wb");
+sample2=fopen("samp2.raw","wb");
+sample3=fopen("samp3.raw","wb");
+sample4=fopen("samp4.raw","wb");
+sample5=fopen("samp5.raw","wb");
+sample6=fopen("samp6.raw","wb");
+#endif
+samplesum=fopen("sampsum.raw","wb");
+#endif
+}
+
+
+void hertz(void)
+{
+ int i, j, oct;
+ long int mult;
+ float pom, pom2, m;
+ float scaler; /* formula below is true for chip clock=3579545 */
+ /* so we need to scale its output accordingly to the chip clock */
+
+/*this loop calculates Hertz values for notes from c#0 up to c-8*/
+/*including 64 'cents' (100/64 which is 1.5625 of real cent) for each semitone*/
+
+ scaler = (float)YM2151_CLOCK / 3579545.0;
+
+ oct = 768;
+ mult = (long int)1 << FREQ_SH;
+
+ for(i=0; i<1*12*64; i++)
+ {
+ pom = scaler * 6.875 * pow(2, ((i + 4 * 64) * 1.5625 / 1200.0)); /*13.75Hz is note A 12semitones below A-0, so C#0 is 4 semitones above then*/
+ /*calculate phase increment for above precounted Hertz value*/
+ pom2 = ((pom * SIN_LEN) / (float)YM2151_SAMPFREQ) * mult; /*fixed point*/
+
+ deltas[i + oct * 4] = pom2 * 16; /*oct 4 - center*/
+ deltas[i + oct * 5] = deltas[oct * 4 + i] << 1; //oct 5
+ deltas[i + oct * 6] = deltas[oct * 4 + i] << 2; //oct 6
+ deltas[i + oct * 7] = deltas[oct * 4 + i] << 3; //oct 7
+ deltas[i + oct * 8] = deltas[oct * 4 + i] << 4; //oct 8
+
+ deltas[i + oct * 3] = deltas[oct * 4 + i] >> 1; //oct 3
+ deltas[i + oct * 2] = deltas[oct * 4 + i] >> 2; //oct 2
+ deltas[i + oct * 1] = deltas[oct * 4 + i] >> 3; //oct 1
+ deltas[i + oct * 0] = deltas[oct * 4 + i] >> 4; //oct 0
+
+ //if (errorlog) fprintf(errorlog,"deltas[%04i] = %08x\n",i,deltas[i]);
+ }
+
+ for(j=0; j<4; j++)
+ {
+ for(i=0; i<32; i++)
+ {
+ pom = scaler * DT1Tab[i][j];
+ //calculate phase increment for above precounted Hertz value
+ DT1deltas[i][j] = ((pom * SIN_LEN) / (float)YM2151_SAMPFREQ) * mult; /*fixed point*/
+ DT1deltas[i][j + 4] = -DT1deltas[i][j];
+ }
+ }
+
+ mult = (long int)1 << LFO_SH;
+ m = (float)YM2151_CLOCK;
+
+ for(i=0; i<256; i++)
+ {
+ j = i & 0x0F;
+ pom = scaler * fabs((m / 65536 / (1 << (i / 16))) - (m / 65536 / 32 / (1 << (i / 16)) * (j + 1)));
+
+ /*calculate phase increment for above precounted Hertz value*/
+ pom2 = ((pom * SIN_LEN) / (float)YM2151_SAMPFREQ) * mult; /*fixed point*/
+ LFOdeltas[0xFF - i] = pom2;
+ //if (errorlog) fprintf(errorlog, "LFO[%02x] = %08x\n",0xff-i, LFOdeltas[0xff-i]);
+ }
+
+ /* calculate KC to index table */
+ j=0;
+ for(i=0; i<16*8; i++)
+ {
+ KC_TO_INDEX[i] = (i >> 4) * 12 * 64 + j * 64 ;
+
+ if ((i & 3) != 3)
+ j++; /* change note code */
+
+ if ((i & 15) == 15)
+ j = 0; /* new octave */
+
+ //if (errorlog) fprintf(errorlog,"NOTE[%i] = %i\n",i,KC_TO_INDEX[i]);
+ }
+
+ /* precalculate envelope times */
+ for(i=0; i<64; i++)
+ {
+ pom = (16 << (i >> 2)) + (4 << (i >> 2)) * (i & 0x03);
+
+ if ((i >> 2) == 0)
+ pom = 1; //infinity
+
+ if ((i >> 2) == 15)
+ pom = 524288; //const
+
+ divid[i] = pom;
+ }
+
+ for(i=0; i<64; i++)
+ {
+ pom = ((128+64+32)<<(i>>2))+((32+16+8)<<(i>>2))*(i&0x03);
+
+ if ((i>>2)==0) pom=1; //infinity
+
+ if ((i>>2)==15)
+ {
+ if ((i & 0x03) == 3)
+ pom = 153293300; //zero attack time
+ else
+ pom = 6422528; //const attack time
+ }
+
+ divia[i] = pom;
+ }
+
+ mult = (long int)1 << ENV_SH;
+
+ for(i=0; i<64; i++)
+ {
+ if (divid[i] == 1)
+ pom = 0; //infinity
+ else
+ pom = (scaler * ENV_RES * mult) / ((float)YM2151_SAMPFREQ * ((float)YM2151_CLOCK / 1000.0 / (float)divid[i]));
+ //if (errorlog) fprintf(errorlog,"i=%03i div=%i time=%f delta=%f\n",i,divid[i],
+ // (float)YM2151_CLOCK/1000.0/(float)divid[i], pom );
+ D_DELTAS[i] = pom;
+ }
+
+ for (i=0; i<64; i++)
+ {
+ if (divia[i] == 1)
+ pom = 0; //infinity
+ else
+ pom = (scaler * ENV_RES * mult) / ((float)YM2151_SAMPFREQ * ((float)YM2151_CLOCK / 1000.0 / (float)divia[i]));
+
+ //if (errorlog) fprintf(errorlog,"i=%03i div=%i time=%f delta=%f\n",i,divia[i],
+ // (float)YM2151_CLOCK/1000.0/(float)divia[i], pom );
+ A_DELTAS[i] = pom;
+ }
+
+ // This is only for speedup purposes -> to avoid testing if (keycode+RKS is
+ // over 63)
+ for(i=0; i<32; i++)
+ {
+ D_DELTAS[64 + i] = D_DELTAS[63];
+ A_DELTAS[64 + i] = A_DELTAS[63];
+ }
+
+ /* precalculate timers deltas */
+ /* User's Manual pages 15,16 */
+ mult = (int)1 << TIMER_SH;
+
+ for(i=0; i<1024; i++)
+ {
+ /* ASG 980324: changed to compute both TimerA and TimerATime */
+ pom = (64.0 * (1024.0 - i) / YM2151_CLOCK);
+ TimerATime[i] = pom;
+ TimerA[i] = pom * YM2151_SAMPFREQ * mult; /*number of samples that timer period should last (fixed point) */
+ }
+
+ for(i=0; i<256; i++)
+ {
+ /* ASG 980324: changed to compute both TimerB and TimerBTime */
+ pom = (1024.0 * (256.0 - i) / YM2151_CLOCK);
+ TimerBTime[i] = pom;
+ TimerB[i] = pom * YM2151_SAMPFREQ * mult; /*number of samples that timer period should last (fixed point) */
+ }
+}
+
+
+void envelope_attack(OscilRec * op)
+{
+ if ((op->attack_volume -= op->delta_AR) < MIN_VOLUME_INDEX) //is volume index min already ?
+ {
+ op->volume = MIN_VOLUME_INDEX;
+ op->state++;
+ }
+ else
+ op->volume = attack_curve[op->attack_volume>>ENV_SH];
+}
+
+
+void envelope_decay(OscilRec * op)
+{
+ if ((op->volume += op->delta_D1R) > op->D1L)
+ {
+ //op->volume = op->D1L;
+ op->state++;
+ }
+}
+
+
+void envelope_sustain(OscilRec * op)
+{
+ if ((op->volume += op->delta_D2R) > MAX_VOLUME_INDEX)
+ {
+ op->state = 4;
+ op->volume = VOLUME_OFF;
+ }
+}
+
+
+void envelope_release(OscilRec * op)
+{
+ if ((op->volume += op->delta_RR) > MAX_VOLUME_INDEX)
+ {
+ op->state = 4;
+ op->volume = VOLUME_OFF;
+ }
+}
+
+
+void envelope_nothing(OscilRec *op)
+{
+}
+
+
+inline void envelope_KOFF(OscilRec * op)
+{
+ op->state = 3; /*release*/
+}
+
+
+inline void envelope_KON(OscilRec * op)
+{
+ /*this is to remove the gap time if TL>0*/
+ op->volume = VOLUME_OFF; //(ENV_RES - op->TL)<<ENV_SH; /*** <- SURE ABOUT IT ? No, but let's give it a try...*/
+ op->attack_volume = op->volume;
+ op->phase = 0;
+ op->state = 0; /*KEY ON = attack*/
+ op->OscilFB = 0; /*Clear feedback after key on */
+}
+
+
+void refresh_chip(YM2151 * PSG)
+{
+ uint16_t kc_index_oscil, kc_index_channel, mul;
+ uint8_t op,v,kc;
+ signed char k,chan;
+ OscilRec * osc;
+
+ for(chan=7; chan>=0; chan--)
+ {
+ kc = PSG->KC[chan];
+ kc_index_channel = KC_TO_INDEX[kc] + PSG->KF[chan];
+ kc >>=2;
+
+ for(k=24; k>=0; k-=8)
+ {
+ op = chan + k;
+ osc = &PSG->Oscils[op];
+
+/*calc freq begin*/
+ v = (PSG->Regs[YM_DT2_D2R_BASE + op] >> 6) & 0x03; //DT2 value
+ kc_index_oscil = kc_index_channel + DT2Tab[v]; //DT2 offset
+ v = PSG->Regs[YM_DT1_MUL_BASE + op];
+ mul = (v & 0x0F) << 1;
+
+ if (mul)
+ osc->freq = deltas[kc_index_oscil] * mul;
+ else
+ osc->freq = deltas[kc_index_oscil];
+
+ osc->freq += DT1deltas[kc][(v >> 4) & 0x07]; //DT1 value
+/*calc freq end*/
+
+/*calc envelopes begin*/
+ v = kc >> PSG->KS[op];
+ osc->delta_AR = A_DELTAS[ osc->AR + v]; /* 2*RR + RKS =max 95*/
+ osc->delta_D1R = D_DELTAS[osc->D1R + v]; /* 2*RR + RKS =max 95*/
+ osc->delta_D2R = D_DELTAS[osc->D2R + v]; /* 2*RR + RKS =max 95*/
+ osc->delta_RR = D_DELTAS[ osc->RR + v]; /* 2*RR + RKS =max 95*/
+/*calc envelopes end*/
+ }
+ }
+}
+
+
+void write_YM_NON_EMULATED(uint8_t n, uint8_t r, uint8_t v)
+{
+ if (errorlog)
+ fprintf(errorlog, "Write to non emulated register %02x value %02x\n", r, v);
+}
+
+
+void write_YM_KON(uint8_t n, uint8_t r, uint8_t v)
+{
+ uint8_t chan;
+ YM2151 * PSG = &(YMPSG[n]);
+
+ chan = v & 0x07;
+
+ if (v & 0x08)
+ envelope_KON(&PSG->Oscils[chan]);
+ else
+ envelope_KOFF(&PSG->Oscils[chan]);
+
+ if (v & 0x10)
+ envelope_KON(&PSG->Oscils[chan + 16]);
+ else
+ envelope_KOFF(&PSG->Oscils[chan + 16]);
+
+ if (v & 0x20)
+ envelope_KON(&PSG->Oscils[chan + 8]);
+ else
+ envelope_KOFF(&PSG->Oscils[chan + 8]);
+
+ if (v & 0x40)
+ envelope_KON(&PSG->Oscils[chan + 24]);
+ else
+ envelope_KOFF(&PSG->Oscils[chan + 24]);
+}
+
+
+void write_YM_CLOCKA1(uint8_t n, uint8_t r, uint8_t v)
+{
+ YMPSG[n].Regs[r] = v;
+}
+
+
+void write_YM_CLOCKA2(uint8_t n, uint8_t r, uint8_t v)
+{
+ YMPSG[n].Regs[r] = v & 0x03;
+}
+
+
+void write_YM_CLOCKB(uint8_t n, uint8_t r, uint8_t v)
+{
+ YMPSG[n].Regs[r] = v;
+}
+
+
+static void timer_callback_a(int n)
+{
+ YM2151 * PSG = &YMPSG[n];
+// YM2151UpdateOne(n, cpu_scalebyfcount(YMBufSize));
+
+ if (PSG->handler)
+ (*PSG->handler)();
+
+ PSG->TimA = 0;
+ PSG->TimIRQ |= 1;
+ PSG->TimATimer = 0;
+}
+
+
+static void timer_callback_b(int n)
+{
+ YM2151 * PSG = &YMPSG[n];
+// YM2151UpdateOne(n, cpu_scalebyfcount(YMBufSize));
+
+ if (PSG->handler)
+ (*PSG->handler)();
+
+ PSG->TimB = 0;
+ PSG->TimIRQ |= 2;
+ PSG->TimBTimer = 0;
+}
+
+
+void write_YM_CLOCKSET(uint8_t n, uint8_t r, uint8_t v)
+{
+ YM2151 * PSG = &(YMPSG[n]);
+
+ v &= 0xBF;
+ //PSG->Regs[r]=v;
+// if (errorlog) fprintf(errorlog,"CSM= %01x FRESET=%02x, IRQEN=%02x, LOAD=%02x\n",v>>7,(v>>4)&0x03,(v>>2)&0x03,v&0x03 );
+
+ if (v & 0x80) //CSM
+ {}
+
+ /* ASG 980324: remove the timers if they exist */
+ if (PSG->TimATimer)
+ timer_remove(PSG->TimATimer);
+
+ if (PSG->TimBTimer)
+ timer_remove(PSG->TimBTimer);
+
+ PSG->TimATimer = 0;
+ PSG->TimBTimer = 0;
+
+ if (v & 0x01) //LOAD A
+ {
+ PSG->TimA = 1;
+ PSG->TimAVal = TimerA[(PSG->Regs[YM_CLOCKA1] << 2) | PSG->Regs[YM_CLOCKA2]];
+ /* ASG 980324: added a real timer if we have a handler */
+
+ if (PSG->handler)
+ PSG->TimATimer = timer_set(TimerATime[(PSG->Regs[YM_CLOCKA1] << 2) | PSG->Regs[YM_CLOCKA2]], n, timer_callback_a);
+ }
+ else
+ PSG->TimA = 0;
+
+ if (v & 0x02) //load B
+ {
+ PSG->TimB = 1;
+ PSG->TimBVal = TimerB[PSG->Regs[YM_CLOCKB]];
+
+ /* ASG 980324: added a real timer if we have a handler */
+ if (PSG->handler)
+ PSG->TimBTimer = timer_set (TimerBTime[PSG->Regs[YM_CLOCKB]], n, timer_callback_b);
+ }
+ else
+ PSG->TimB = 0;
+
+ if (v & 0x04) //IRQEN A
+ {}
+
+ if (v & 0x08) //IRQEN B
+ {}
+
+ if (v & 0x10) //FRESET A
+ {
+ PSG->TimIRQ &= 0xFE;
+ }
+
+ if (v & 0x20) //FRESET B
+ {
+ PSG->TimIRQ &= 0xFD;
+ }
+}
+
+
+void write_YM_CT1_CT2_W(uint8_t n, uint8_t r, uint8_t v)
+{
+ YMPSG[n].Regs[r] = v;
+}
+
+
+void write_YM_CONNECT_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ // NOTE: L/R Channel enables are ignored! This emu is mono!
+ YM2151 * PSG = &(YMPSG[n]);
+
+ //PSG->Regs[r] = v;
+ uint8_t chan = r - YM_CONNECT_BASE;
+
+ PSG->ConnectTab[chan] = v & 7; /*connection number*/
+ PSG->FeedBack[chan] = FEED[(v >> 3) & 7];
+}
+
+
+void write_YM_KC_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ YMPSG[n].KC[r - YM_KC_BASE] = v;
+ //freq_calc(chan,PSG);
+}
+
+
+void write_YM_KF_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ YMPSG[n].KF[r - YM_KF_BASE] = v >> 2;
+ //freq_calc(chan,PSG);
+}
+
+
+void write_YM_PMS_AMS_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+// uint8_t chan, i;
+ YM2151 * PSG = &(YMPSG[n]);
+ PSG->Regs[r] = v;
+ uint8_t chan = r - YM_PMS_AMS_BASE;
+
+ PMTab[chan] = v >> 4; //PMS;
+
+// if (i && errorlog)
+// fprintf(errorlog,"PMS CHN %02x =%02x\n", chan, i);
+
+ AMTab[chan] = v & 0x03; //AMS;
+
+// if (i && errorlog)
+// fprintf(errorlog,"AMS CHN %02x =%02x\n", chan, i);
+
+}
+
+
+void write_YM_DT1_MUL_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ YMPSG[n].Regs[r] = v;
+ //freq_calc(chan,PSG);
+}
+
+
+void write_YM_TL_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ v &= 0x7F;
+ YMPSG[n].Oscils[r - YM_TL_BASE].TL = v << (ENV_BITS - 7); /*7bit TL*/
+}
+
+
+void write_YM_KS_AR_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ uint8_t op;
+ YM2151 * PSG;
+
+ op = r - YM_KS_AR_BASE;
+ PSG = &(YMPSG[n]);
+
+ PSG->KS[op] = 3 - (v >> 6);
+ PSG->Oscils[op].AR = (v & 0x1F) << 1;
+}
+
+
+void write_YM_AMS_D1R_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ uint8_t op = r - YM_AMS_D1R_BASE;
+
+ if ((v & 0x80) && errorlog)
+ fprintf(errorlog,"AMS ON oper%02x\n", op);
+
+ //HERE something to do with AMS;
+
+ YMPSG[n].Oscils[op].D1R = (v & 0x1F) << 1;
+}
+
+
+void write_YM_DT2_D2R_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ YM2151 * PSG = &(YMPSG[n]);
+ OscilRec * osc = &PSG->Oscils[r - YM_DT2_D2R_BASE];
+ PSG->Regs[r] = v;
+
+ osc->D2R = (v & 0x1F) << 1;
+ //freq_calc(chan,PSG);
+}
+
+
+void write_YM_D1L_RR_BASE(uint8_t n, uint8_t r, uint8_t v)
+{
+ OscilRec * osc = &YMPSG[n].Oscils[r - YM_D1L_RR_BASE];
+
+ osc->D1L = decib45[(v >> 4) & 0x0F];
+ osc->RR = ((v & 0x0F) << 2) | 0x02;
+}
+
+
+/*
+** Initialize YM2151 emulator(s).
+**
+** 'num' is the number of virtual YM2151's to allocate
+** 'clock' is the chip clock
+** 'rate' is sampling rate and 'bufsiz' is the size of the
+** buffer that should be updated at each interval
+*/
+int YMInit(int num, int clock, int rate, int sample_bits, int bufsiz)//, SAMPLE ** buffer)
+{
+ int i;
+
+ if (YMPSG)
+ return (-1); /* duplicate init. */
+
+ YMNumChips = num;
+ YM2151_SAMPFREQ = rate;
+
+#if 0
+ if (sample_bits == 16)
+ sample_16bit = 1;
+ else
+ sample_16bit = 0;
+#endif
+
+ YM2151_CLOCK = clock;
+ YMBufSize = bufsiz;
+
+ envelope_calc[0] = envelope_attack;
+ envelope_calc[1] = envelope_decay;
+ envelope_calc[2] = envelope_sustain;
+ envelope_calc[3] = envelope_release;
+ envelope_calc[4] = envelope_nothing;
+
+ for(i=0; i<256; i++)
+ register_writes[i] = write_YM_NON_EMULATED;
+
+ register_writes[YM_KON] = write_YM_KON;
+ register_writes[YM_CLOCKA1] = write_YM_CLOCKA1;
+ register_writes[YM_CLOCKA2] = write_YM_CLOCKA2;
+ register_writes[YM_CLOCKB] = write_YM_CLOCKB;
+ register_writes[YM_CLOCKSET] = write_YM_CLOCKSET;
+ register_writes[YM_CT1_CT2_W] = write_YM_CT1_CT2_W;
+
+ for(i=YM_CONNECT_BASE; i<YM_CONNECT_BASE+8; i++)
+ register_writes[i] = write_YM_CONNECT_BASE;
+
+ for(i=YM_KC_BASE; i<YM_KC_BASE+8; i++)
+ register_writes[i] = write_YM_KC_BASE;
+
+ for(i=YM_KF_BASE; i<YM_KF_BASE+8; i++)
+ register_writes[i] = write_YM_KF_BASE;
+
+ for(i=YM_PMS_AMS_BASE; i<YM_PMS_AMS_BASE+8; i++)
+ register_writes[i] = write_YM_PMS_AMS_BASE;
+
+ for(i=YM_DT1_MUL_BASE; i<YM_DT1_MUL_BASE+32; i++)
+ register_writes[i] = write_YM_DT1_MUL_BASE;
+
+ for(i=YM_TL_BASE; i<YM_TL_BASE+32; i++)
+ register_writes[i] = write_YM_TL_BASE;
+
+ for(i=YM_KS_AR_BASE; i<YM_KS_AR_BASE+32; i++)
+ register_writes[i] = write_YM_KS_AR_BASE;
+
+ for(i=YM_AMS_D1R_BASE; i<YM_AMS_D1R_BASE+32; i++)
+ register_writes[i] = write_YM_AMS_D1R_BASE;
+
+ for(i=YM_DT2_D2R_BASE; i<YM_DT2_D2R_BASE+32; i++)
+ register_writes[i] = write_YM_DT2_D2R_BASE;
+
+ for(i=YM_D1L_RR_BASE; i<YM_D1L_RR_BASE+32; i++)
+ register_writes[i] = write_YM_D1L_RR_BASE;
+
+ YMPSG = (YM2151 *)malloc(sizeof(YM2151) * YMNumChips);
+
+ if (YMPSG == NULL)
+ return (1);
+
+ TL_TAB = (signed int *)malloc(sizeof(signed int) * TL_TAB_LEN);
+
+ if (TL_TAB == NULL)
+ return (1);
+
+// BuffTemp = (signed int *)malloc(sizeof(signed int) * YMBufSize);
+ // 16K ought to be enough for anybody
+ BuffTemp = (signed int *)malloc(sizeof(signed int) * 16384);
+
+ if (BuffTemp == NULL)
+ return (1);
+
+ hertz();
+ sin_init();
+
+ for(i=0; i<YMNumChips; i++)
+ {
+ YMPSG[i].Buf = 0;//buffer[i];
+ YMPSG[i].bufp = 0;
+ YMResetChip(i);
+ }
+
+ return 0;
+}
+
+
+void YMShutdown()
+{
+ if (!YMPSG)
+ return;
+
+ free(YMPSG);
+ YMPSG = NULL;
+
+ if (TL_TAB)
+ {
+ free(TL_TAB);
+ TL_TAB = NULL;
+ }
+
+ if (BuffTemp)
+ {
+ free(BuffTemp);
+ BuffTemp = NULL;
+ }
+
+ YM2151_SAMPFREQ = YMBufSize = 0;
+
+#ifdef SAVE_SAMPLE
+#ifdef SAVE_SEPARATE_CHANNELS
+fclose(sample1);
+fclose(sample2);
+fclose(sample3);
+fclose(sample4);
+fclose(sample5);
+fclose(sample6);
+#endif
+fclose(samplesum);
+#endif
+}
+
+
+/* write a register on YM2151 chip number 'n' */
+void YMWriteReg(int n, int r, int v)
+{
+ register_writes[(uint8_t)r]((uint8_t)n, (uint8_t)r, (uint8_t)v);
+}
+
+
+uint8_t YMReadReg(uint8_t n)
+{
+ return YMPSG[n].TimIRQ;
+}
+
+
+/*
+** reset all chip registers.
+*/
+void YMResetChip(int num)
+{
+ int i;
+ YM2151 * PSG = &(YMPSG[num]);
+
+// memset(PSG->Buf, '\0', YMBufSize);
+
+ /* ASG 980324 -- reset the timers before writing to the registers */
+ PSG->TimATimer = 0;
+ PSG->TimBTimer = 0;
+
+ /* initialize hardware registers */
+ for(i=0; i<256; i++)
+ PSG->Regs[i] = 0;
+
+ for(i=0; i<32; i++)
+ {
+ memset(&PSG->Oscils[i], '\0', sizeof(OscilRec));
+ PSG->Oscils[i].volume = VOLUME_OFF;
+ PSG->Oscils[i].state = 4; //envelope off
+ }
+
+ for(i=0; i<8; i++)
+ {
+ PSG->ConnectTab[i] = 0;
+ PSG->FeedBack[i] = 0;
+ }
+
+ PSG->TimA = 0;
+ PSG->TimB = 0;
+ PSG->TimAVal = 0;
+ PSG->TimBVal = 0;
+ PSG->TimIRQ = 0;
+}
+
+
+static inline signed int op_calc(OscilRec * OP, signed int pm)
+{
+ return sin_tab[(((OP->phase += OP->freq) >> FREQ_SH) + (pm)) & SIN_MASK]
+ [OP->TL + (OP->volume >> ENV_SH)];
+}
+
+
+//void YM2151UpdateOne(int num, int endp)
+void YM2151UpdateOne(void * BUF, int endp)
+{
+// YM2151 * PSG = &(YMPSG[num]);
+ YM2151 * PSG = &(YMPSG[0]);
+ PSG->bufp = 0;
+// SAMPLE * BUF;
+ signed int * PSGBUF;
+ OscilRec * OP0, * OP1, * OP2, * OP3;
+ uint16_t i;
+ signed int k, wy;
+#ifdef SAVE_SEPARATE_CHANNELS
+ signed int pom;
+#endif
+
+ refresh_chip(PSG);
+
+ //calculate timers...
+ if (PSG->TimA)
+ {
+ PSG->TimAVal -= ((endp - PSG->bufp) << TIMER_SH);
+
+ if (PSG->TimAVal <= 0)
+ {
+ PSG->TimA = 0;
+ PSG->TimIRQ |= 1;
+ /* ASG 980324 - handled by real timers now
+ if (PSG->handler !=0) PSG->handler();*/
+ }
+ }
+
+ if (PSG->TimB)
+ {
+ PSG->TimBVal -= ((endp - PSG->bufp) << TIMER_SH);
+
+ if (PSG->TimBVal <= 0)
+ {
+ PSG->TimB = 0;
+ PSG->TimIRQ |= 2;
+ /* ASG 980324 - handled by real timers now
+ if (PSG->handler !=0) PSG->handler();*/
+ }
+ }
+
+ OP0 = &PSG->Oscils[0 ];
+ OP1 = &PSG->Oscils[0 + 8];
+ OP2 = &PSG->Oscils[0 + 16];
+ OP3 = &PSG->Oscils[0 + 24];
+
+ for(PSGBUF=&BuffTemp[PSG->bufp]; PSGBUF<&BuffTemp[endp]; PSGBUF++)
+ {
+ //chan0
+ envelope_calc[OP0->state](OP0);
+ envelope_calc[OP1->state](OP1);
+ envelope_calc[OP2->state](OP2);
+ envelope_calc[OP3->state](OP3);
+
+ wy = op_calc(OP0, OP0->OscilFB);
+
+ if (PSG->FeedBack[0])
+ OP0->OscilFB = wy >> PSG->FeedBack[0];
+ else
+ OP0->OscilFB = 0;
+
+ switch(PSG->ConnectTab[0])
+ {
+ case 0: *(PSGBUF) = op_calc(OP3, op_calc(OP1, op_calc(OP2, wy))); break;
+ case 1: *(PSGBUF) = op_calc(OP3, op_calc(OP1, op_calc(OP2, 0) + wy)); break;
+ case 2: *(PSGBUF) = op_calc(OP3, op_calc(OP1, op_calc(OP2, 0)) + wy); break;
+ case 3: *(PSGBUF) = op_calc(OP3, op_calc(OP2, wy) + op_calc(OP1, 0)); break;
+ case 4: *(PSGBUF) = op_calc(OP2, wy) + op_calc(OP3, op_calc(OP1, 0)); break;
+ case 5: *(PSGBUF) = op_calc(OP2, wy) + op_calc(OP1, wy) + op_calc(OP3, wy); break;
+ case 6: *(PSGBUF) = op_calc(OP2, wy) + op_calc(OP1, 0) + op_calc(OP3, 0); break;
+ default: *(PSGBUF) = wy + op_calc(OP2, 0) + op_calc(OP1, 0) + op_calc(OP3, 0); break;
+ }
+#ifdef SAVE_SEPARATE_CHANNELS
+fputc((uint16_t)(*PSGBUF) & 0xFF, sample1);
+fputc(((uint16_t)(*PSGBUF) >> 8) & 0xFF, sample1);
+#endif
+ }
+
+ //chan1
+ OP0 = &PSG->Oscils[1 ];
+ OP1 = &PSG->Oscils[1 + 8];
+ OP2 = &PSG->Oscils[1 + 16];
+ OP3 = &PSG->Oscils[1 + 24];
+
+ for(PSGBUF=&BuffTemp[PSG->bufp]; PSGBUF<&BuffTemp[endp]; PSGBUF++)
+ {
+ envelope_calc[OP0->state](OP0);
+ envelope_calc[OP1->state](OP1);
+ envelope_calc[OP2->state](OP2);
+ envelope_calc[OP3->state](OP3);
+
+ wy = op_calc(OP0, OP0->OscilFB);
+
+ if (PSG->FeedBack[1])
+ OP0->OscilFB = wy >> PSG->FeedBack[1];
+ else
+ OP0->OscilFB = 0;
+
+#ifdef SAVE_SEPARATE_CHANNELS
+pom = *(PSGBUF);
+#endif
+ switch(PSG->ConnectTab[1])
+ {
+ case 0: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,wy) ) ); break;
+ case 1: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)+wy ) ); break;
+ case 2: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)) +wy ); break;
+ case 3: *(PSGBUF) += op_calc(OP3, op_calc(OP2, wy)+op_calc(OP1,0) ); break;
+ case 4: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP3, op_calc(OP1,0)); break;
+ case 5: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1, wy) + op_calc(OP3,wy); break;
+ case 6: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1,0) + op_calc(OP3,0); break;
+ default: *(PSGBUF) += wy + op_calc(OP2, 0) + op_calc(OP1, 0) + op_calc(OP3, 0); break;
+ }
+
+#ifdef SAVE_SEPARATE_CHANNELS
+fputc((uint16_t)((*PSGBUF)-pom)&0xff,sample2);
+fputc(((uint16_t)((*PSGBUF)-pom)>>8)&0xff,sample2);
+#endif
+ }
+
+//chan2
+ OP0 = &PSG->Oscils[2 ];
+ OP1 = &PSG->Oscils[2 + 8];
+ OP2 = &PSG->Oscils[2 + 16];
+ OP3 = &PSG->Oscils[2 + 24];
+
+for( PSGBUF = &BuffTemp[PSG->bufp]; PSGBUF < &BuffTemp[endp]; PSGBUF++ )
+{
+ envelope_calc[OP0->state](OP0);
+ envelope_calc[OP1->state](OP1);
+ envelope_calc[OP2->state](OP2);
+ envelope_calc[OP3->state](OP3);
+
+ wy = op_calc(OP0, OP0->OscilFB);
+ if (PSG->FeedBack[2])
+ OP0->OscilFB = wy >> PSG->FeedBack[2];
+ else
+ OP0->OscilFB = 0;
+
+#ifdef SAVE_SEPARATE_CHANNELS
+ pom=*(PSGBUF);
+#endif
+ switch(PSG->ConnectTab[2])
+ {
+ case 0: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,wy) ) ); break;
+ case 1: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)+wy ) ); break;
+ case 2: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)) +wy ); break;
+ case 3: *(PSGBUF) += op_calc(OP3, op_calc(OP2, wy)+op_calc(OP1,0) ); break;
+ case 4: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP3, op_calc(OP1,0)); break;
+ case 5: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1, wy) + op_calc(OP3,wy); break;
+ case 6: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1,0) + op_calc(OP3,0); break;
+ default:*(PSGBUF) += wy + op_calc(OP2,0) + op_calc(OP1,0) + op_calc(OP3,0);break;
+ }
+#ifdef SAVE_SEPARATE_CHANNELS
+fputc((uint16_t)((*PSGBUF)-pom)&0xff,sample3);
+fputc(((uint16_t)((*PSGBUF)-pom)>>8)&0xff,sample3);
+#endif
+}
+
+//chan3
+ OP0 = &PSG->Oscils[3 ];
+ OP1 = &PSG->Oscils[3 + 8];
+ OP2 = &PSG->Oscils[3 + 16];
+ OP3 = &PSG->Oscils[3 + 24];
+
+for( PSGBUF = &BuffTemp[PSG->bufp]; PSGBUF < &BuffTemp[endp]; PSGBUF++ )
+{
+ envelope_calc[OP0->state](OP0);
+ envelope_calc[OP1->state](OP1);
+ envelope_calc[OP2->state](OP2);
+ envelope_calc[OP3->state](OP3);
+
+ wy = op_calc(OP0, OP0->OscilFB);
+ if (PSG->FeedBack[3])
+ OP0->OscilFB = wy >> PSG->FeedBack[3];
+ else
+ OP0->OscilFB = 0;
+
+#ifdef SAVE_SEPARATE_CHANNELS
+ pom=*(PSGBUF);
+#endif
+ switch(PSG->ConnectTab[3])
+ {
+ case 0: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,wy) ) ); break;
+ case 1: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)+wy ) ); break;
+ case 2: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)) +wy ); break;
+ case 3: *(PSGBUF) += op_calc(OP3, op_calc(OP2, wy)+op_calc(OP1,0) ); break;
+ case 4: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP3, op_calc(OP1,0)); break;
+ case 5: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1, wy) + op_calc(OP3,wy); break;
+ case 6: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1,0) + op_calc(OP3,0); break;
+ default:*(PSGBUF) += wy + op_calc(OP2,0) + op_calc(OP1,0) + op_calc(OP3,0);break;
+ }
+#ifdef SAVE_SEPARATE_CHANNELS
+fputc((uint16_t)((*PSGBUF)-pom)&0xff,sample4);
+fputc(((uint16_t)((*PSGBUF)-pom)>>8)&0xff,sample4);
+#endif
+}
+
+ //chan4
+ OP0 = &PSG->Oscils[4 ];
+ OP1 = &PSG->Oscils[4 + 8];
+ OP2 = &PSG->Oscils[4 + 16];
+ OP3 = &PSG->Oscils[4 + 24];
+
+ for(PSGBUF=&BuffTemp[PSG->bufp]; PSGBUF<&BuffTemp[endp]; PSGBUF++)
+ {
+ envelope_calc[OP0->state](OP0);
+ envelope_calc[OP1->state](OP1);
+ envelope_calc[OP2->state](OP2);
+ envelope_calc[OP3->state](OP3);
+
+ wy = op_calc(OP0, OP0->OscilFB);
+
+ if (PSG->FeedBack[4])
+ OP0->OscilFB = wy >> PSG->FeedBack[4];
+ else
+ OP0->OscilFB = 0;
+
+ #ifdef SAVE_SEPARATE_CHANNELS
+ pom = *(PSGBUF);
+ #endif
+
+ switch(PSG->ConnectTab[4])
+ {
+ case 0: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,wy) ) ); break;
+ case 1: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)+wy ) ); break;
+ case 2: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)) +wy ); break;
+ case 3: *(PSGBUF) += op_calc(OP3, op_calc(OP2, wy)+op_calc(OP1,0) ); break;
+ case 4: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP3, op_calc(OP1,0)); break;
+ case 5: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1, wy) + op_calc(OP3,wy); break;
+ case 6: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1,0) + op_calc(OP3,0); break;
+ default:*(PSGBUF) += wy + op_calc(OP2,0) + op_calc(OP1,0) + op_calc(OP3,0);break;
+ }
+
+#ifdef SAVE_SEPARATE_CHANNELS
+fputc((uint16_t)((*PSGBUF)-pom)&0xff,sample5);
+fputc(((uint16_t)((*PSGBUF)-pom)>>8)&0xff,sample5);
+#endif
+ }
+
+ //chan5
+ OP0 = &PSG->Oscils[5 ];
+ OP1 = &PSG->Oscils[5 + 8];
+ OP2 = &PSG->Oscils[5 + 16];
+ OP3 = &PSG->Oscils[5 + 24];
+
+for( PSGBUF = &BuffTemp[PSG->bufp]; PSGBUF < &BuffTemp[endp]; PSGBUF++ )
+{
+ envelope_calc[OP0->state](OP0);
+ envelope_calc[OP1->state](OP1);
+ envelope_calc[OP2->state](OP2);
+ envelope_calc[OP3->state](OP3);
+
+ wy = op_calc(OP0, OP0->OscilFB);
+ if (PSG->FeedBack[5])
+ OP0->OscilFB = wy >> PSG->FeedBack[5];
+ else
+ OP0->OscilFB = 0;
+
+#ifdef SAVE_SEPARATE_CHANNELS
+ pom=*(PSGBUF);
+#endif
+ switch(PSG->ConnectTab[5])
+ {
+ case 0: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,wy) ) ); break;
+ case 1: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)+wy ) ); break;
+ case 2: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)) +wy ); break;
+ case 3: *(PSGBUF) += op_calc(OP3, op_calc(OP2, wy)+op_calc(OP1,0) ); break;
+ case 4: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP3, op_calc(OP1,0)); break;
+ case 5: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1, wy) + op_calc(OP3,wy); break;
+ case 6: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1,0) + op_calc(OP3,0); break;
+ default:*(PSGBUF) += wy + op_calc(OP2,0) + op_calc(OP1,0) + op_calc(OP3,0);break;
+ }
+#ifdef SAVE_SEPARATE_CHANNELS
+fputc((uint16_t)((*PSGBUF)-pom)&0xff,sample6);
+fputc(((uint16_t)((*PSGBUF)-pom)>>8)&0xff,sample6);
+#endif
+}
+
+//chan6
+ OP0 = &PSG->Oscils[6 ];
+ OP1 = &PSG->Oscils[6 + 8];
+ OP2 = &PSG->Oscils[6 + 16];
+ OP3 = &PSG->Oscils[6 + 24];
+
+for( PSGBUF = &BuffTemp[PSG->bufp]; PSGBUF < &BuffTemp[endp]; PSGBUF++ )
+{
+ envelope_calc[OP0->state](OP0);
+ envelope_calc[OP1->state](OP1);
+ envelope_calc[OP2->state](OP2);
+ envelope_calc[OP3->state](OP3);
+
+ wy = op_calc(OP0, OP0->OscilFB);
+ if (PSG->FeedBack[6])
+ OP0->OscilFB = wy >> PSG->FeedBack[6];
+ else
+ OP0->OscilFB = 0;
+
+ switch(PSG->ConnectTab[6])
+ {
+ case 0: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,wy) ) ); break;
+ case 1: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)+wy ) ); break;
+ case 2: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)) +wy ); break;
+ case 3: *(PSGBUF) += op_calc(OP3, op_calc(OP2, wy)+op_calc(OP1,0) ); break;
+ case 4: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP3, op_calc(OP1,0)); break;
+ case 5: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1, wy) + op_calc(OP3,wy); break;
+ case 6: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1,0) + op_calc(OP3,0); break;
+ default:*(PSGBUF) += wy + op_calc(OP2,0) + op_calc(OP1,0) + op_calc(OP3,0);break;
+ }
+}
+
+ //chan7
+ OP0 = &PSG->Oscils[7 ];
+ OP1 = &PSG->Oscils[7 + 8];
+ OP2 = &PSG->Oscils[7 + 16];
+ OP3 = &PSG->Oscils[7 + 24];
+
+ for(PSGBUF=&BuffTemp[PSG->bufp]; PSGBUF<&BuffTemp[endp]; PSGBUF++)
+ {
+ envelope_calc[OP0->state](OP0);
+ envelope_calc[OP1->state](OP1);
+ envelope_calc[OP2->state](OP2);
+ envelope_calc[OP3->state](OP3);
+
+ wy = op_calc(OP0, OP0->OscilFB);
+
+ if (PSG->FeedBack[7])
+ OP0->OscilFB = wy >> PSG->FeedBack[7];
+ else
+ OP0->OscilFB = 0;
+
+ switch(PSG->ConnectTab[7])
+ {
+ case 0: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,wy) ) ); break;
+ case 1: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)+wy ) ); break;
+ case 2: *(PSGBUF) += op_calc(OP3, op_calc(OP1, op_calc(OP2,0)) +wy ); break;
+ case 3: *(PSGBUF) += op_calc(OP3, op_calc(OP2, wy)+op_calc(OP1,0) ); break;
+ case 4: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP3, op_calc(OP1,0)); break;
+ case 5: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1, wy) + op_calc(OP3,wy); break;
+ case 6: *(PSGBUF) += op_calc(OP2,wy) + op_calc(OP1,0) + op_calc(OP3,0); break;
+ default:*(PSGBUF) += wy + op_calc(OP2,0) + op_calc(OP1,0) + op_calc(OP3,0);break;
+ }
+ }
+
+// BUF = PSG->Buf;
+ PSGBUF = &BuffTemp[PSG->bufp];
+
+ for(i=PSG->bufp; i<endp; i++)
+ {
+ k = *(PSGBUF++);
+
+#ifdef SAVE_SAMPLE
+fputc((uint16_t)(-k) & 0xFF, samplesum);
+fputc(((uint16_t)(-k) >> 8) & 0xFF, samplesum);
+#endif
+
+#if 1
+// if (sample_16bit)
+ {
+ /*16 bit mode*/
+ k >>= FINAL_SH16; //AUDIO_CONV
+ k <<= 2;
+
+ if (k > 32767)
+ k = 32767;
+ else if (k < -32768)
+ k = -32768;
+
+ ((uint16_t *)BUF)[i] = (uint16_t)k;
+ }
+#else
+// else
+ {
+ /*8 bit mode*/
+ k >>= FINAL_SH8; //AUDIO_CONV
+
+ if (k > 127)
+ k = 127;
+ else if (k < -128)
+ k = -128;
+
+ ((uint8_t *)BUF)[i] = (uint8_t)k;
+ }
+#endif
+ }
+
+ PSG->bufp = endp;
+}
+
+
+/*
+** called to update all chips
+*/
+void YM2151Update(void)
+{
+ int i;
+ for(i=0; i<YMNumChips; i++)
+ {
+ if (YMPSG[i].bufp < YMBufSize)
+;// YM2151UpdateOne(i, YMBufSize);
+
+ YMPSG[i].bufp = 0;
+ }
+}
+
+
+/*
+** return the buffer into which YM2151Update() has just written it's sample
+** data
+*/
+SAMPLE * YMBuffer(int n)
+{
+ return YMPSG[n].Buf;
+}
+
+
+void YMSetIrqHandler(int n, void(* handler)(void))
+{
+ YMPSG[n].handler = handler;
+}
+
projects / thunder / commitdiff