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Atari 2600: Sketchy implementation of audio output (mode 0x01 only)

This commit is contained in:
pjgat09 2012-03-15 20:34:14 +00:00
parent 516735d3b6
commit 2d94018eaa
2 changed files with 45 additions and 1 deletions
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35
BizHawk.Emulation/Consoles/Atari/2600/Atari2600.cs
View File

@ -71,7 +71,40 @@ namespace BizHawk
public int BufferWidth { get { return 320; } }
public int BufferHeight { get { return 262; } }
public int BackgroundColor { get { return 0; } }
public void GetSamples(short[] samples) { }
public void GetSamples(short[] samples)
{
int freqDiv = 0;
byte myP4 = 0x00;
short[] moreSamples = new short[1000];
for (int i = 0; i < 1000; i++)
{
if (++freqDiv == (tia.audioFreqDiv * 2))
{
freqDiv = 0;
myP4 = (byte)(((myP4 & 0x0f) != 0) ? ((myP4 << 1) | ((((myP4 & 0x08) != 0) ? 1 : 0) ^ (((myP4 & 0x04) != 0) ? 1 : 0))) : 1);
}
moreSamples[i] = (short)(((myP4 & 0x08) != 0) ? 32767 : 0);
}
for (int i = 0; i < samples.Length/2; i++)
{
//samples[i] = 0;
if (tia.audioEnabled)
{
samples[i*2] = moreSamples[(int)(((double)moreSamples.Length / (double)(samples.Length/2)) * i)];
//samples[i * 2 + 1] = moreSamples[(int)((moreSamples.Length / (samples.Length / 2)) * i)];
//samples[i] = (short)(Math.Sin(((((32000.0 / (tia.audioFreqDiv+1)) / 60.0) * Math.PI) / samples.Length) * i) * MaxVolume + MaxVolume);
}
else
{
samples[i] = 0;
}
}
//samples = tia.samples;
}
public void DiscardSamples() { }
public int MaxVolume { get; set; }
private IList<MemoryDomain> memoryDomains;

11
BizHawk.Emulation/Consoles/Atari/2600/TIA.cs
View File

@ -11,6 +11,9 @@ namespace BizHawk.Emulation.Consoles.Atari
{
Atari2600 core;
public bool audioEnabled = false;
public byte audioFreqDiv = 0;
UInt32 PF; // PlayField data
byte BKcolor, PFcolor;
bool PFpriority = false;
@ -536,6 +539,14 @@ namespace BizHawk.Emulation.Consoles.Atari
{
ball.pos = (byte)(scanlinePos - 68 + 4);
}
else if (maskedAddr == 0x15) // AUDC0
{
audioEnabled = value != 0;
}
else if (maskedAddr == 0x17) // AUDF0
{
audioFreqDiv = (byte)(value + 1);
}
else if (maskedAddr == 0x1B) // GRP0
{
player0.grp = value;