363 lines
14 KiB
C
363 lines
14 KiB
C
#include "dsid.h"
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#include <math.h> // INFINITY
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#include <stdlib.h>
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#include <string.h> // memset, memcpy
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#define SID_OUT_SCALE (0x10000 * 3 * 16)
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// CONTROL
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#define GAT 0x01
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#define SYN 0x02
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#define RNG 0x04
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#define TST 0x08
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#define TRI 0x10
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#define SAW 0x20
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#define PUL 0x40
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#define NOI 0x80
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#define _HZ 0x10
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#define DECSUS 0x40
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#define ATK 0x80
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// filter mode (high)
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#define LP 0x10
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#define BP 0x20
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#define HP 0x40
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#define OFF3 0x80
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#define waveforms_add_sample(_id,_s) \
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sid->lastOut[_id]=(_s);
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const int Aexp[256] = {
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1, 30, 30, 30, 30, 30, 30, 16, 16, 16, 16, 16, 16, 16, 16, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
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double cmbWF(int chn, int *wfa, int index, int differ6581, struct SID_globals *g) {
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if (differ6581 && g->model == 6581)
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index &= 0x7FF;
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return wfa[index];
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}
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void cCmbWF(int *wfa, double bitmul, double bstr, double trh) {
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for (int i = 0; i < 4096; i++) {
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wfa[i] = 0;
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for (int j = 0; j < 12; j++) {
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double blvl = 0;
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for (int k = 0; k < 12; k++) {
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blvl += (bitmul / pow(bstr, abs(k - j))) * (((i >> k) & 1) - 0.5);
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}
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wfa[i] += (blvl >= trh) ? pow(2, j) : 0;
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}
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wfa[i] *= 12;
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}
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}
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void dSID_init(struct SID_chip* sid, double clockRate, double samplingRate, int model, unsigned char init_wf) {
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if (model == 6581) {
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sid->g.model = 6581;
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} else {
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sid->g.model = 8580;
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}
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memset(sid->M,0,MemLen);
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memset(sid->SIDct, 0, sizeof(sid->SIDct));
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 3; j++) {
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sid->SIDct[i].ch[j].Ast = _HZ;
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sid->SIDct[i].ch[j].nLFSR = 0x7FFFF8;
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sid->SIDct[i].ch[j].prevwfout = 0;
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}
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sid->SIDct[i].ch[0].FSW = 1;
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sid->SIDct[i].ch[1].FSW = 2;
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sid->SIDct[i].ch[2].FSW = 4;
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}
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sid->g.ctfr = -2.0 * 3.14 * (12500.0 / 256.0) / samplingRate,
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sid->g.ctf_ratio_6581 = -2.0 * 3.14 * (20000.0 / 256.0) / samplingRate;
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sid->g.ckr = clockRate / samplingRate;
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const double bAprd[16] = {9, 32 * 1, 63 * 1, 95 * 1, 149 * 1, 220 * 1,
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267 * 1, 313 * 1, 392 * 1, 977 * 1, 1954 * 1, 3126 * 1,
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3907 * 1, 11720 * 1, 19532 * 1, 31251 * 1};
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const int bAstp[16] = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
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memcpy(&sid->g.Aprd, &bAprd, sizeof(bAprd));
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memcpy(&sid->g.Astp, &bAstp, sizeof(bAstp));
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if (init_wf) {
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cCmbWF(sid->g.trsaw, 0.8, 2.4, 0.64);
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cCmbWF(sid->g.pusaw, 1.4, 1.9, 0.68);
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cCmbWF(sid->g.Pulsetrsaw, 0.8, 2.5, 0.64);
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}
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double prd0 = sid->g.ckr > 9 ? sid->g.ckr : 9;
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sid->g.Aprd[0] = prd0;
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sid->g.Astp[0] = ceil(prd0 / 9);
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}
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double dSID_render(struct SID_chip* sid) {
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double flin = 0, output = 0;
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double wfout = 0;
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for (int chn = 0; chn < 3; chn++) {
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struct SIDVOICE *voic = &((struct SIDMEM *) (sid->M))->v[chn];
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double pgt = (sid->SIDct->ch[chn].Ast & GAT);
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uint8_t ctrl = voic->control;
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uint8_t wf = ctrl & 0xF0;
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uint8_t test = ctrl & TST;
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uint8_t SR = voic->susres;
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double tmp = 0;
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if (pgt != (ctrl & GAT)) {
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if (pgt) {
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sid->SIDct->ch[chn].Ast &= 0xFF - (GAT | ATK | DECSUS);
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} else {
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sid->SIDct->ch[chn].Ast = (GAT | ATK | DECSUS);
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if ((SR & 0xF) > (sid->SIDct->ch[chn].pSR & 0xF))
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tmp = 1;
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}
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}
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sid->SIDct->ch[chn].pSR = SR;
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sid->SIDct->ch[chn].rcnt += sid->g.ckr;
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if (sid->SIDct->ch[chn].rcnt >= 0x8000)
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sid->SIDct->ch[chn].rcnt -= 0x8000;
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static double step;
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double prd;
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if (sid->SIDct->ch[chn].Ast & ATK) {
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step = voic->attack;
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prd = sid->g.Aprd[(int) step];
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} else if (sid->SIDct->ch[chn].Ast & DECSUS) {
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step = voic->decay;
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prd = sid->g.Aprd[(int) step];
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} else {
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step = SR & 0xF;
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prd = sid->g.Aprd[(int) step];
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}
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step = sid->g.Astp[(int) step];
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if (sid->SIDct->ch[chn].rcnt >= prd && sid->SIDct->ch[chn].rcnt < prd + sid->g.ckr &&
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tmp == 0) {
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sid->SIDct->ch[chn].rcnt -= prd;
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if ((sid->SIDct->ch[chn].Ast & ATK) ||
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++sid->SIDct->ch[chn].expcnt == Aexp[(int) sid->SIDct->ch[chn].envcnt]) {
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if (!(sid->SIDct->ch[chn].Ast & _HZ)) {
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if (sid->SIDct->ch[chn].Ast & ATK) {
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sid->SIDct->ch[chn].envcnt += step;
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if (sid->SIDct->ch[chn].envcnt >= 0xFF) {
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sid->SIDct->ch[chn].envcnt = 0xFF;
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sid->SIDct->ch[chn].Ast &= 0xFF - ATK;
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}
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} else if (!(sid->SIDct->ch[chn].Ast & DECSUS) ||
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sid->SIDct->ch[chn].envcnt > (SR >> 4) + (SR & 0xF0)) {
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sid->SIDct->ch[chn].envcnt -= step;
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if (sid->SIDct->ch[chn].envcnt <= 0 &&
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sid->SIDct->ch[chn].envcnt + step != 0) {
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sid->SIDct->ch[chn].envcnt = 0;
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sid->SIDct->ch[chn].Ast |= _HZ;
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}
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}
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}
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sid->SIDct->ch[chn].expcnt = 0;
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} else {
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}
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}
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sid->SIDct->ch[chn].envcnt = (int) sid->SIDct->ch[chn].envcnt & 0xFF;
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double aAdd = (voic->freq_low + voic->freq_high * 256) * sid->g.ckr;
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if (test || ((ctrl & SYN) && sid->SIDct->sMSBrise)) {
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sid->SIDct->ch[chn].pacc = 0;
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} else {
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sid->SIDct->ch[chn].pacc += aAdd;
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if (sid->SIDct->ch[chn].pacc > 0xFFFFFF)
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sid->SIDct->ch[chn].pacc -= 0x1000000;
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}
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double MSB = (int) sid->SIDct->ch[chn].pacc & 0x800000;
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sid->SIDct->sMSBrise = (MSB > ((int) sid->SIDct->ch[chn].pracc & 0x800000)) ? 1 : 0;
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if (wf & NOI) {
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tmp = sid->SIDct->ch[chn].nLFSR;
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if ((((int) sid->SIDct->ch[chn].pacc & 0x100000) !=
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((int) sid->SIDct->ch[chn].pracc & 0x100000)) ||
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aAdd >= 0x100000) {
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step = ((int) tmp & 0x400000) ^ (((int) tmp & 0x20000) << 5);
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tmp = (((int) tmp << 1) + (step > 0 || test)) & 0x7FFFFF;
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sid->SIDct->ch[chn].nLFSR = tmp;
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}
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wfout = (wf & 0x70) ? 0
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: (((int) tmp & 0x100000) >> 5) + (((int) tmp & 0x40000) >> 4) +
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(((int) tmp & 0x4000) >> 1) + (((int) tmp & 0x800) << 1) +
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(((int) tmp & 0x200) << 2) + (((int) tmp & 0x20) << 5) +
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(((int) tmp & 0x04) << 7) + (((int) tmp & 0x01) << 8);
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} else if (wf & PUL) {
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double pw = (voic->pw_low + (voic->pw_high) * 256) * 16;
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tmp = (int) aAdd >> 9;
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if (0 < pw && pw < tmp)
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pw = tmp;
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tmp = (int) tmp ^ 0xFFFF;
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if (pw > tmp)
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pw = tmp;
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tmp = (int) sid->SIDct->ch[chn].pacc >> 8;
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if (wf == PUL) {
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int lel = ((int) aAdd >> 16);
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if (lel > 0) {
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step = 256.0 / (double) lel;
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} else {
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step = INFINITY;
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}
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if (test)
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wfout = 0xFFFF;
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else if (tmp < pw) {
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double lim = (0xFFFF - pw) * step;
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if (lim > 0xFFFF)
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lim = 0xFFFF;
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wfout = lim - (pw - tmp) * step;
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if (wfout < 0)
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wfout = 0;
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} else {
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double lim = pw * step;
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if (lim > 0xFFFF)
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lim = 0xFFFF;
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wfout = (0xFFFF - tmp) * step - lim;
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if (wfout >= 0)
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wfout = 0xFFFF;
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wfout = (int) wfout & 0xFFFF;
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}
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} else {
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wfout = (tmp >= pw || test) ? 0xFFFF : 0;
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if (wf & TRI) {
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if (wf & SAW) {
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wfout =
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(wfout) ? cmbWF(chn, sid->g.Pulsetrsaw, (int) tmp >> 4, 1, &sid->g) : 0;
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} else {
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tmp = (int) sid->SIDct->ch[chn].pacc ^ (ctrl & RNG ? sid->SIDct->sMSB : 0);
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wfout =
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(wfout)
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? cmbWF(chn, sid->g.pusaw,
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((int) tmp ^ ((int) tmp & 0x800000 ? 0xFFFFFF : 0)) >> 11,
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0, &sid->g)
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: 0;
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}
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} else if (wf & SAW)
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wfout = (wfout) ? cmbWF(chn, sid->g.pusaw, (int) tmp >> 4, 1, &sid->g) : 0;
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}
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} else if (wf & SAW) {
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wfout = (int) sid->SIDct->ch[chn].pacc >> 8;
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if (wf & TRI)
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wfout = cmbWF(chn, sid->g.trsaw, (int) wfout >> 4, 1, &sid->g);
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else {
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step = aAdd / 0x1200000;
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wfout += wfout * step;
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if (wfout > 0xFFFF)
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wfout = 0xFFFF - (wfout - 0x10000) / step;
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}
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} else if (wf & TRI) {
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tmp = (int) sid->SIDct->ch[chn].pacc ^ (ctrl & RNG ? sid->SIDct->sMSB : 0);
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wfout = ((int) tmp ^ ((int) tmp & 0x800000 ? 0xFFFFFF : 0)) >> 7;
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}
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if (wf)
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sid->SIDct->ch[chn].prevwfout = wfout;
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else {
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wfout = sid->SIDct->ch[chn].prevwfout;
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}
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sid->SIDct->ch[chn].pracc = sid->SIDct->ch[chn].pacc;
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sid->SIDct->sMSB = MSB;
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// double preflin = flin;
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if ((sid->mute_mask & (1 << chn))) {
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if (sid->M[0x17] & sid->SIDct->ch[chn].FSW) {
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double chnout = (wfout - 0x8000) * (sid->SIDct->ch[chn].envcnt / 256);
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flin += chnout;
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// fake filter for solo waveform ahead
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// mostly copypasted from below
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double fakeflin = chnout;
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double fakeflout = 0;
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static double fakeplp[3] = {0};
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static double fakepbp[3] = {0};
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double ctf = ((double) (sid->M[0x15] & 7)) / 8 + sid->M[0x16] + 0.2;
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double reso;
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if (sid->g.model == 8580) {
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ctf = 1 - exp(ctf * sid->g.ctfr);
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reso = pow(2, ((double) (4 - (double) (sid->M[0x17] >> 4)) / 8));
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} else {
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if (ctf < 24)
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ctf = 0.035;
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else
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ctf = 1 - 1.263 * exp(ctf * sid->g.ctf_ratio_6581);
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reso = (sid->M[0x17] > 0x5F) ? 8.0 / (double) (sid->M[0x17] >> 4) : 1.41;
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}
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double tmp = fakeflin + fakepbp[chn] * reso + fakeplp[chn];
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if (sid->M[0x18] & HP)
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fakeflout -= tmp;
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tmp = fakepbp[chn] - tmp * ctf;
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fakepbp[chn] = tmp;
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if (sid->M[0x18] & BP)
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fakeflout -= tmp;
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tmp = fakeplp[chn] + tmp * ctf;
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fakeplp[chn] = tmp;
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if (sid->M[0x18] & LP)
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fakeflout += tmp;
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double wf_out = (fakeflout / SID_OUT_SCALE) * (sid->M[0x18] & 0xF) * 65535;
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waveforms_add_sample(1 + chn, wf_out);
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} else if ((chn % 3) != 2 || !(sid->M[0x18] & OFF3)) {
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double chnout = (wfout - 0x8000) * (sid->SIDct->ch[chn].envcnt / 256);
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output += chnout;
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double wf_out = (chnout / SID_OUT_SCALE) * (sid->M[0x18] & 0xF) * 65535;
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waveforms_add_sample(1 + chn, wf_out);
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}
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} else {
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waveforms_add_sample(1 + chn, 0);
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}
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}
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int M1 = 0;
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if (M1 & 3)
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sid->M[0x1B] = (int) wfout >> 8;
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sid->M[0x1C] = sid->SIDct->ch[2].envcnt;
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double ctf = ((double) (sid->M[0x15] & 7)) / 8 + sid->M[0x16] + 0.2;
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double reso;
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if (sid->g.model == 8580) {
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ctf = 1 - exp(ctf * sid->g.ctfr);
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reso = pow(2, ((double) (4 - (double) (sid->M[0x17] >> 4)) / 8));
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} else {
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if (ctf < 24)
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ctf = 0.035;
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else
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ctf = 1 - 1.263 * exp(ctf * sid->g.ctf_ratio_6581);
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reso = (sid->M[0x17] > 0x5F) ? 8.0 / (double) (sid->M[0x17] >> 4) : 1.41;
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}
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double tmp = flin + sid->SIDct->pbp * reso + sid->SIDct->plp;
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if (sid->M[0x18] & HP)
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output -= tmp;
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tmp = sid->SIDct->pbp - tmp * ctf;
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sid->SIDct->pbp = tmp;
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if (sid->M[0x18] & BP)
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output -= tmp;
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tmp = sid->SIDct->plp + tmp * ctf;
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sid->SIDct->plp = tmp;
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if (sid->M[0x18] & LP)
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output += tmp;
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return (output / SID_OUT_SCALE) * (sid->M[0x18] & 0xF);
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}
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void dSID_setMuteMask(struct SID_chip* sid, int mute_mask) {
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sid->mute_mask = mute_mask;
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}
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float dSID_getVolume(struct SID_chip* sid, int channel) {
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if ((sid->M[0x18] & 0xF) == 0)
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return 0;
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return sid->SIDct[0].ch[channel].envcnt / 256.0f;
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}
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void dSID_write(struct SID_chip* sid, unsigned char addr, unsigned char val) {
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sid->M[addr&0x1f]=val;
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}
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