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diced up TIA audio into tiny bits. GHOSTBUSTERS!!!! also, i have no idea what i'm doing

This commit is contained in:
goyuken 2012-10-10 00:16:38 +00:00
parent 9f9aeb6609
commit 494f1bdbb5
1 changed files with 163 additions and 62 deletions
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225
BizHawk.Emulation/Consoles/Atari/2600/TIA.cs
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@ -425,31 +425,172 @@ namespace BizHawk.Emulation.Consoles.Atari
public int BufferHeight { get { return 262; } }
public int BackgroundColor { get { return 0; } }
//byte[] snd4 = new byte[2];
//byte[] snd4 = new byte[2];
public struct audio
public class audio
{
/// <summary>noise/division control</summary>
public byte AUDC;
public byte AUDC = 0;
/// <summary>frequency divider</summary>
public byte AUDF;
public byte AUDF = 1;
/// <summary>volume</summary>
public byte AUDV;
public byte AUDV = 0;
public byte sr4;
public byte sr5;
/// <summary>2 state counter</summary>
bool sr1 = true;
/// <summary>4 bit shift register</summary>
int sr4 = 0x0f;
/// <summary>5 bit shift register</summary>
int sr5 = 0x1f;
/// <summary>3 state counter</summary>
int sr3 = 2;
public byte freqcnt;
/// <summary>counter based off AUDF</summary>
byte freqcnt = 0;
public void run_4()
/// <summary>latched audio value</summary>
bool on = true;
bool run_3()
{
sr4 = (byte)(((sr4 & 0x0F) != 0) ? (sr4 << 1) | ((((sr4 & 0x08) != 0) ? 1 : 0) ^ (((sr4 & 0x04) != 0) ? 1 : 0)) : 1);
sr3++;
if (sr3 == 3)
{
sr3 = 0;
return true;
}
return false;
}
public void run_5()
bool run_4()
{
sr5 = (byte)(((sr5 & 0x1F) != 0) ? (sr5 << 1) | (((sr5 & 0x10) != 0) ? 1 : 0) ^ (((sr5 & 0x04) != 0) ? 1 : 0) : 1);
bool ret = (sr4 & 1) != 0;
bool c = (sr4 & 1) != 0 ^ (sr4 & 2) != 0;
sr4 = (sr4 >> 1) | (c ? 8 : 0);
return ret;
}
bool run_5()
{
bool ret = (sr5 & 1) != 0;
bool c = (sr5 & 1) != 0 ^ (sr5 & 4) != 0;
sr5 = (sr5 >> 1) | (c ? 16 : 0);
return ret;
}
bool one_4()
{
bool ret = (sr4 & 1) != 0;
sr4 = (sr4 >> 1) | 8;
return ret;
}
bool one_5()
{
bool ret = (sr5 & 1) != 0;
sr5 = (sr5 >> 1) | 16;
return ret;
}
bool run_1()
{
sr1 = !sr1;
return !sr1;
}
bool run_9()
{
bool ret = (sr4 & 1) != 0;
bool c = (sr5 & 1) != 0 ^ (sr4 & 1) != 0;
sr4 = (sr4 >> 1) | ((sr5 & 1) != 0 ? 8 : 0);
sr5 = (sr5 >> 1) | (c ? 16 : 0);
return ret;
}
/// <summary>
/// call me approx 31k times a second
/// </summary>
/// <returns>16 bit audio sample</returns>
public short cycle()
{
if (++freqcnt == (AUDF * 2))
{
freqcnt = 0;
switch (AUDC)
{
case 0x00:
case 0x0b:
// Both have a 1 s
one_5();
on = one_4();
break;
case 0x01:
// Both run, but the 5 bit is ignored
on = run_4();
run_5();
break;
case 0x02:
if ((sr5 & 0x0f) == 0 || (sr5 & 0x0f) == 0x0f)
{
on = run_4();
break;
}
run_5();
break;
case 0x03:
if (run_5())
{
on = run_4();
break;
}
break;
case 0x04:
run_5();
one_4();
on = run_1();
break;
case 0x05:
one_5();
run_4();
on = run_1();
break;
case 0x06:
case 0x0a:
run_4(); // ???
run_5();
if ((sr5 & 0x0f) == 0)
on = false;
else if ((sr5 & 0x0f) == 0x0f)
on = true;
break;
case 0x07:
case 0x09:
run_4(); // ???
on = run_5();
break;
case 0x08:
on = run_9();
break;
case 0x0c:
case 0x0d:
if (run_3())
on = run_1();
break;
case 0x0e:
if (run_3())
goto case 0x06;
break;
case 0x0f:
if (run_3())
goto case 0x07;
break;
}
}
return (short)(on ? AUDV * 1092 : 0);
}
public void SyncState(Serializer ser)
@ -457,12 +598,16 @@ namespace BizHawk.Emulation.Consoles.Atari
ser.Sync("AUDC", ref AUDC);
ser.Sync("AUDF", ref AUDF);
ser.Sync("AUDV", ref AUDV);
ser.Sync("sr1", ref sr1);
ser.Sync("sr3", ref sr3);
ser.Sync("sr4", ref sr4);
ser.Sync("sr5", ref sr5);
ser.Sync("freqcnt", ref freqcnt);
ser.Sync("on", ref on);
}
};
}
public audio[] AUD = new audio[2];
public audio[] AUD = { new audio(), new audio() };
public void GetSamples(short[] samples)
{
@ -471,52 +616,8 @@ namespace BizHawk.Emulation.Consoles.Atari
{
for (int snd = 0; snd < 2; snd++)
{
if (++AUD[snd].freqcnt == (AUD[snd].AUDF * 2))
{
AUD[snd].freqcnt = 0;
switch (AUD[snd].AUDC)
{
case 0x00:
// Both have a 1 s
AUD[snd].sr5 = (byte)(((AUD[snd].sr5 & 0x1F) != 0) ? (AUD[snd].sr5 << 1) | 0x01 : 1);
AUD[snd].sr4 = (byte)(((AUD[snd].sr4 & 0x0F) != 0) ? (AUD[snd].sr4 << 1) | 0x01 : 1);
break;
case 0x01:
// Both run, but the 5 bit is ignored
AUD[snd].run_4();
AUD[snd].run_5();
break;
case 0x02:
if ((AUD[snd].sr5 & 0x0F) == 0x08)
{
AUD[snd].run_4();
break;
}
AUD[snd].run_5();
break;
case 0x03:
if ((AUD[snd].sr5 & 0x10) == 0x10)
{
AUD[snd].run_4();
break;
}
AUD[snd].run_5();
break;
case 0x04:
AUD[snd].run_5();
AUD[snd].sr4 = (byte)(((AUD[snd].sr4 & 0x0F) != 0) ? (AUD[snd].sr4 << 1) | 0x01 : 1);
break;
}
}
moreSamples[i] += (short)(((AUD[snd].sr4 & 0x08) != 0) ? AUD[snd].AUDV * 1092 : 0);
moreSamples[i] += AUD[snd].cycle();
//moreSamples[i] += (short)(((AUD[snd].sr4 & 0x08) != 0) ? AUD[snd].AUDV * 1092 : 0);
}
/*if (++freqDiv == (audioFreqDiv * 2))
{