78 lines
2.3 KiB
C#
78 lines
2.3 KiB
C#
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using System;
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using Essgee.Utilities;
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namespace Essgee.Emulation.Audio
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{
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public class SegaGGPSG : SegaSMSPSG
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{
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public const int PortStereoControl = 0x06;
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[StateRequired]
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readonly bool[] channel0Enable, channel1Enable, channel2Enable, channel3Enable;
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public SegaGGPSG() : base()
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{
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channel0Enable = new bool[2];
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channel1Enable = new bool[2];
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channel2Enable = new bool[2];
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channel3Enable = new bool[2];
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}
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public override void Reset()
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{
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base.Reset();
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WritePort(PortStereoControl, 0xFF);
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}
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protected override void GenerateSample()
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{
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for (int i = 0; i < numOutputChannels; i++)
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{
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/* Generate samples */
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var ch1 = (channel0Enable[i] ? (short)(volumeTable[volumeRegisters[0]] * ((toneRegisters[0] < 2 ? true : channelOutput[0]) ? 1.0 : 0.0)) : (short)0);
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var ch2 = (channel1Enable[i] ? (short)(volumeTable[volumeRegisters[1]] * ((toneRegisters[1] < 2 ? true : channelOutput[1]) ? 1.0 : 0.0)) : (short)0);
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var ch3 = (channel2Enable[i] ? (short)(volumeTable[volumeRegisters[2]] * ((toneRegisters[2] < 2 ? true : channelOutput[2]) ? 1.0 : 0.0)) : (short)0);
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var ch4 = (channel3Enable[i] ? (short)(volumeTable[volumeRegisters[3]] * (noiseLfsr & 0x1)) : (short)0);
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channelSampleBuffer[0].Add(ch1);
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channelSampleBuffer[1].Add(ch2);
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channelSampleBuffer[2].Add(ch3);
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channelSampleBuffer[3].Add(ch4);
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/* Mix samples */
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var mixed = 0;
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if (channel1ForceEnable) mixed += ch1;
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if (channel2ForceEnable) mixed += ch2;
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if (channel3ForceEnable) mixed += ch3;
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if (channel4ForceEnable) mixed += ch4;
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mixed /= numChannels;
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mixedSampleBuffer.Add((short)mixed);
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}
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}
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public override void WritePort(byte port, byte data)
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{
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if (port == PortStereoControl)
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{
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/* Stereo control */
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channel0Enable[0] = ((data & 0x10) != 0); /* Ch1 Left */
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channel0Enable[1] = ((data & 0x01) != 0); /* Ch1 Right */
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channel1Enable[0] = ((data & 0x20) != 0); /* Ch2 Left */
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channel1Enable[1] = ((data & 0x02) != 0); /* Ch2 Right */
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channel2Enable[0] = ((data & 0x40) != 0); /* Ch3 Left */
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channel2Enable[1] = ((data & 0x04) != 0); /* Ch3 Right */
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channel3Enable[0] = ((data & 0x80) != 0); /* Ch4 Left */
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channel3Enable[1] = ((data & 0x08) != 0); /* Ch4 Right */
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}
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else
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base.WritePort(port, data);
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}
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}
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}
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