75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
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#include "sms.h"
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#include <math.h>
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void DivPlatformSMS::acquire(short& l, short& r) {
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short v;
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sn->sound_stream_update(&v,1);
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l=v;
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r=v;
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}
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void DivPlatformSMS::tick() {
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for (int i=0; i<3; i++) {
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if (chan[i].freqChanged) {
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sn->write(0x80|i<<5|(chan[i].freq&15));
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sn->write(chan[i].freq>>4);
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chan[i].freqChanged=false;
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}
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}
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if (chan[3].freqChanged || updateSNMode) {
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updateSNMode=false;
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chan[3].freqChanged=false;
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if (snNoiseMode&2) { // take period from channel 3
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if (snNoiseMode&1) {
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sn->write(0xe7);
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} else {
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sn->write(0xe3);
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}
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sn->write(0xdf);
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sn->write(0xc0|(chan[3].freq&15));
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sn->write(chan[3].freq>>4);
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} else { // 3 fixed values
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unsigned char value=chan[3].note%12;
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if (value>2) value=2;
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value=2-value;
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sn->write(0xe0|value|((snNoiseMode&1)<<2));
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}
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}
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}
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int DivPlatformSMS::dispatch(DivCommand c) {
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switch (c.cmd) {
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case DIV_CMD_NOTE_ON:
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chan[c.chan].freq=3430/pow(2.0f,((float)c.value/12.0f));
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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chan[c.chan].active=true;
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sn->write(0x90|c.chan<<5|(15-chan[c.chan].vol));
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break;
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case DIV_CMD_NOTE_OFF:
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chan[c.chan].active=false;
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break;
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case DIV_CMD_VOLUME:
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chan[c.chan].vol=c.value;
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sn->write(0x90|c.chan<<5|(15-chan[c.chan].vol));
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break;
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case DIV_CMD_STD_NOISE_MODE:
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snNoiseMode=(c.value&1)|((c.value&16)>>3);
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updateSNMode=true;
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break;
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default:
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break;
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}
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return 1;
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}
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int DivPlatformSMS::init(DivEngine* p, int channels, int sugRate) {
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parent=p;
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rate=223722;
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sn=new sn76496_device("sn",223722);
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sn->device_start();
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snNoiseMode=0;
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updateSNMode=false;
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return 4;
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}
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