otomatalabs/furnace
8
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

more SMS work

Browse source 
it is able to play some modules... the next step is to bind this to the
Genesis platform
This commit is contained in:
tildearrow 2021-05-15 16:42:48 -05:00
parent d9f076ef64
commit 3172fd37ed
7 changed files with 147 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

18
src/engine/platform/sms.cpp
View file

@ -1,4 +1,5 @@
#include "sms.h"
#include "../engine.h"
#include <math.h>
void DivPlatformSMS::acquire(short& l, short& r) {
@ -9,8 +10,13 @@ void DivPlatformSMS::acquire(short& l, short& r) {
}
void DivPlatformSMS::tick() {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) sn->write(0x90|(i<<5)|(15-((chan[i].vol*chan[i].std.vol)>>4)));
}
for (int i=0; i<3; i++) {
if (chan[i].freqChanged) {
chan[i].freq=(chan[i].baseFreq*(2048-chan[i].pitch))>>11;
sn->write(0x80|i<<5|(chan[i].freq&15));
sn->write(chan[i].freq>>4);
chan[i].freqChanged=false;
@ -18,6 +24,7 @@ void DivPlatformSMS::tick() {
}
if (chan[3].freqChanged || updateSNMode) {
updateSNMode=false;
chan[3].freq=(chan[3].baseFreq*(2048-chan[3].pitch))>>11;
chan[3].freqChanged=false;
if (snNoiseMode&2) { // take period from channel 3
if (snNoiseMode&1) {
@ -40,19 +47,28 @@ void DivPlatformSMS::tick() {
int DivPlatformSMS::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON:
chan[c.chan].freq=3430/pow(2.0f,((float)c.value/12.0f));
chan[c.chan].baseFreq=1712/pow(2.0f,((float)c.value/12.0f));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
chan[c.chan].active=true;
sn->write(0x90|c.chan<<5|(15-chan[c.chan].vol));
chan[c.chan].std.init(parent->song.ins[chan[c.chan].ins]);
break;
case DIV_CMD_NOTE_OFF:
chan[c.chan].active=false;
break;
case DIV_CMD_INSTRUMENT:
chan[c.chan].ins=c.value;
chan[c.chan].std.init(parent->song.ins[chan[c.chan].ins]);
break;
case DIV_CMD_VOLUME:
chan[c.chan].vol=c.value;
sn->write(0x90|c.chan<<5|(15-chan[c.chan].vol));
break;
case DIV_CMD_PITCH:
chan[c.chan].pitch=c.value;
chan[c.chan].freqChanged=true;
break;
case DIV_CMD_STD_NOISE_MODE:
snNoiseMode=(c.value&1)|((c.value&16)>>3);
updateSNMode=true;

2
src/engine/platform/sms.h
View file

@ -1,4 +1,5 @@
#include "../dispatch.h"
#include "../macroInt.h"
#include "sound/sn76496.h"
class DivPlatformSMS: public DivDispatch {
@ -7,6 +8,7 @@ class DivPlatformSMS: public DivDispatch {
unsigned char ins, note;
bool active, insChanged, freqChanged, keyOn, keyOff;
signed char vol;
DivMacroInt std;
Channel(): freq(0), baseFreq(0), pitch(0), ins(0), note(0), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), vol(15) {}
};
Channel chan[4];