C64: fix dSID multi-chip
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6bbb407863
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e8130caa52
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@ -613,6 +613,24 @@ void DivPlatformC64::setFlags(const DivConfig& flags) {
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keyPriority=flags.getBool("keyPriority",true);
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testAD=((flags.getInt("testAttack",0)&15)<<4)|(flags.getInt("testDecay",0)&15);
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testSR=((flags.getInt("testSustain",0)&15)<<4)|(flags.getInt("testRelease",0)&15);
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// init fake filter table
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// taken from dSID
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double cutRatio=-2.0*3.14*(sidIs6581?(((double)oscBuf[0]->rate/44100.0)*(20000.0/256.0)):(12500.0/256.0))/(double)oscBuf[0]->rate;
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for (int i=0; i<2048; i++) {
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double c=(double)i/8.0+0.2;
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if (sidIs6581) {
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if (c<24) {
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c=2.0*sin(771.78/(double)oscBuf[0]->rate);
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} else {
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c=(44100.0/(double)oscBuf[0]->rate)-1.263*(44100.0/(double)oscBuf[0]->rate)*exp(c*cutRatio);
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}
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} else {
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c=1-exp(c*cutRatio);
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}
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fakeCutTable[i]=c;
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}
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}
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int DivPlatformC64::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
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@ -56,6 +56,7 @@ class DivPlatformC64: public DivDispatch {
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Channel chan[3];
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DivDispatchOscBuffer* oscBuf[3];
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bool isMuted[3];
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float fakeCutTable[2048];
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struct QueuedWrite {
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unsigned char addr;
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unsigned char val;
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@ -115,11 +115,17 @@ void dSID_init(struct SID_chip* sid, double clockRate, double samplingRate, int
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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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for (int i=0; i<3; i++) {
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sid->fakeplp[i]=0;
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sid->fakepbp[i]=0;
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}
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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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double step = 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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@ -142,7 +148,6 @@ double dSID_render(struct SID_chip* sid) {
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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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@ -291,8 +296,6 @@ double dSID_render(struct SID_chip* sid) {
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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 = sid->g.ctf_table[((sid->M[0x15]&7)|(sid->M[0x16]<<3))&0x7ff];
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double reso;
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if (sid->g.model == 8580) {
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@ -300,15 +303,15 @@ double dSID_render(struct SID_chip* sid) {
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} else {
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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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double tmp = fakeflin + sid->fakepbp[chn] * reso + sid->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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tmp = sid->fakepbp[chn] - tmp * ctf;
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sid->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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tmp = sid->fakeplp[chn] + tmp * ctf;
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sid->fakeplp[chn] = tmp;
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if (sid->M[0x18] & LP)
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fakeflout += tmp;
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@ -81,6 +81,8 @@ struct SID_chip {
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uint8_t M[MemLen];
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int16_t lastOut[3];
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int mute_mask;
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double fakeplp[3];
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double fakepbp[3];
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};
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double dSID_render(struct SID_chip* sid);
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