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genesis extended channel 3 support.

Browse source 
as of today Furnace is able to play most Genesis songs without trouble.
bugs are expected, and fixes will arrive.

are you ready?
This commit is contained in:
tildearrow 2021-05-18 16:02:49 -05:00
parent d9c02531e8
commit 09ed99f0b0
6 changed files with 261 additions and 44 deletions
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36
src/engine/platform/genesis.cpp
View file

@ -3,6 +3,8 @@
#include <string.h>
#include <math.h>
#include "genesisshared.h"
void DivPlatformGenesis::acquire(int& l, int& r) {
static short o[2];
@ -52,38 +54,9 @@ void DivPlatformGenesis::acquire(int& l, int& r) {
r=(o[1]<<7)+psgOut;
}
static unsigned short chanOffs[6]={
0x00, 0x01, 0x02, 0x100, 0x101, 0x102
};
static unsigned short opOffs[4]={
0x00, 0x04, 0x08, 0x0c
};
static unsigned char konOffs[6]={
0, 1, 2, 4, 5, 6
};
static bool isOutput[8][4]={
// 1 3 2 4
{false,false,false,true},
{false,false,false,true},
{false,false,false,true},
{false,false,false,true},
{false,false,true ,true},
{false,true ,true ,true},
{false,true ,true ,true},
{true ,true ,true ,true},
};
static unsigned char dtTable[8]={
7,6,5,0,1,2,3,0
};
static int dacRates[6]={
160,160,116,80,58,40
};
static int orderedOps[4]={
0,2,1,3
};
void DivPlatformGenesis::tick() {
for (int i=0; i<6; i++) {
if (i==2 && extMode) continue;
if (chan[i].keyOn || chan[i].keyOff) {
writes.emplace(0x28,0x00|konOffs[i]);
chan[i].keyOff=false;
@ -98,6 +71,7 @@ void DivPlatformGenesis::tick() {
}
for (int i=0; i<6; i++) {
if (i==2 && extMode) continue;
if (chan[i].freqChanged) {
chan[i].freq=(chan[i].baseFreq*(ONE_SEMITONE+chan[i].pitch))/ONE_SEMITONE;
if (chan[i].freq>=82432) {
@ -158,8 +132,6 @@ int DivPlatformGenesis::octave(int freq) {
return 1;
}
#define rWrite(a,v) pendingWrites[a]=v;
int DivPlatformGenesis::dispatch(DivCommand c) {
if (c.chan>5) {
c.chan-=6;