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Add core option Swap Duty Cycles

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This commit is contained in:
retro-wertz
2017-10-05 14:43:20 +08:00
parent a09d500e7f
commit 2cdf32300b
3 changed files with 38 additions and 8 deletions
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24
src/sound.c
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@@ -195,9 +195,12 @@ static DECLFW(Write_PSG) {
// FCEU_printf("APU1 %04x:%04x\n",A,V);
A &= 0x1F;
switch (A) {
case 0x0: DoSQ1();
case 0x0:
DoSQ1();
EnvUnits[0].Mode = (V & 0x30) >> 4;
EnvUnits[0].Speed = (V & 0xF);
if (swapDuty)
V = (V & 0x3F) | ((V & 0x80) >> 1) | ((V & 0x40) << 1);
break;
case 0x1:
sweepon[0] = V & 0x80;
@@ -214,30 +217,36 @@ static DECLFW(Write_PSG) {
DoSQ2();
EnvUnits[1].Mode = (V & 0x30) >> 4;
EnvUnits[1].Speed = (V & 0xF);
if (swapDuty)
V = (V & 0x3F) | ((V & 0x80) >> 1) | ((V & 0x40) << 1);
break;
case 0x5:
sweepon[1] = V & 0x80;
break;
case 0x6: DoSQ2();
case 0x6:
DoSQ2();
curfreq[1] &= 0xFF00;
curfreq[1] |= V;
break;
case 0x7:
SQReload(1, V);
break;
case 0xa: DoTriangle();
case 0xa:
DoTriangle();
break;
case 0xb:
DoTriangle();
if (EnabledChannels & 0x4)
lengthcount[2] = lengthtable[(V >> 3) & 0x1f];
TriMode = 1; // Load mode
TriMode = 1; /* Load mode */
break;
case 0xC: DoNoise();
case 0xC:
DoNoise();
EnvUnits[2].Mode = (V & 0x30) >> 4;
EnvUnits[2].Speed = (V & 0xF);
break;
case 0xE: DoNoise();
case 0xE:
DoNoise();
break;
case 0xF:
DoNoise();
@@ -245,7 +254,8 @@ static DECLFW(Write_PSG) {
lengthcount[3] = lengthtable[(V >> 3) & 0x1f];
EnvUnits[2].reloaddec = 1;
break;
case 0x10: DoPCM();
case 0x10:
DoPCM();
LoadDMCPeriod(V & 0xF);
if (SIRQStat & 0x80) {