107 lines
2.9 KiB
C#
107 lines
2.9 KiB
C#
using System;
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using VirtualNes.Core.Emu2413;
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namespace VirtualNes.Core
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{
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public class APU_VRC7 : APU_INTERFACE
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{
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OPLL VRC7_OPLL;
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byte address;
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public APU_VRC7()
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{
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Emu2413API.OPLL_init(3579545, 22050); // 仮のサンプリングレート
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VRC7_OPLL = Emu2413API.OPLL_new();
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if (VRC7_OPLL != null)
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{
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Emu2413API.OPLL_reset(VRC7_OPLL);
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Emu2413API.OPLL_reset_patch(VRC7_OPLL, Emu2413API.OPLL_VRC7_TONE);
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VRC7_OPLL.masterVolume = 128;
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}
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// 仮設定
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Reset(APU_CLOCK, 22050);
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}
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public override void Dispose()
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{
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if (VRC7_OPLL != null)
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{
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Emu2413API.OPLL_delete(VRC7_OPLL);
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VRC7_OPLL = null;
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// OPLL_close(); // 無くても良い(中身無し)
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}
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}
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public override void Reset(float fClock, int nRate)
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{
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if (VRC7_OPLL != null)
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{
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Emu2413API.OPLL_reset(VRC7_OPLL);
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Emu2413API.OPLL_reset_patch(VRC7_OPLL, Emu2413API.OPLL_VRC7_TONE);
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VRC7_OPLL.masterVolume = 128;
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}
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address = 0;
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Setup(fClock, nRate);
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}
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public override void Setup(float fClock, int nRate)
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{
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Emu2413API.OPLL_setClock((UInt32)(fClock * 2.0f), (UInt32)nRate);
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}
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public override void Write(ushort addr, byte data)
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{
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if (VRC7_OPLL != null)
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{
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if (addr == 0x9010)
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{
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address = data;
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}
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else if (addr == 0x9030)
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{
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Emu2413API.OPLL_writeReg(VRC7_OPLL, address, data);
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}
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}
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}
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public override int Process(int channel)
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{
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if (VRC7_OPLL != null)
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return Emu2413API.OPLL_calc(VRC7_OPLL);
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return 0;
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}
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float[] blkmul = { 0.5f, 1.0f, 2.0f, 4.0f, 8.0f, 16.0f, 32.0f, 64.0f };
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public override int GetFreq(int channel)
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{
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if (VRC7_OPLL != null && channel < 8)
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{
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int fno = ((VRC7_OPLL.reg[0x20 + channel] & 0x01) << 8) + VRC7_OPLL.reg[0x10 + channel];
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int blk = (VRC7_OPLL.reg[0x20 + channel] >> 1) & 0x07;
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if ((VRC7_OPLL.reg[0x20 + channel] & 0x10) != 0)
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{
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return (int)((256.0d * fno * blkmul[blk]) / ((1 << 18) / (3579545.0 / 72.0)));
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}
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}
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return 0;
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}
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public override uint GetSize()
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{
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return 0;
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}
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public override void SaveState(StateBuffer buffer)
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{
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//not impl
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}
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}
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}
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