AxibugEmuOnline/OtherCore/MyNes.Standard2/MyNes.Core/Mapper026.cs

246 lines
5.7 KiB
C#

using System.IO;
namespace MyNes.Core
{
[BoardInfo("VRC6", 26)]
[WithExternalSound]
internal class Mapper026 : Board
{
private int irq_reload;
private int irq_counter;
private int prescaler;
private bool irq_mode_cycle;
private bool irq_enable;
private bool irq_enable_on_ak;
private VRC6Pulse snd_1;
private VRC6Pulse snd_2;
private VRC6Sawtooth snd_3;
private double[] audio_pulse_table;
private double[] audio_tnd_table;
internal override void Initialize(IRom rom)
{
base.Initialize(rom);
snd_1 = new VRC6Pulse();
snd_2 = new VRC6Pulse();
snd_3 = new VRC6Sawtooth();
audio_pulse_table = new double[32];
for (int i = 0; i < 32; i++)
{
audio_pulse_table[i] = 95.52 / (8128.0 / (double)i + 100.0);
}
audio_tnd_table = new double[204];
for (int j = 0; j < 204; j++)
{
audio_tnd_table[j] = 163.67 / (24329.0 / (double)j + 100.0);
}
}
internal override void HardReset()
{
base.HardReset();
Switch08KPRG(PRG_ROM_08KB_Mask, PRGArea.AreaE000);
APUApplyChannelsSettings();
snd_1.HardReset();
snd_2.HardReset();
snd_3.HardReset();
}
internal override void WritePRG(ref ushort address, ref byte data)
{
switch (address)
{
case 32768:
case 32769:
case 32770:
case 32771:
Switch16KPRG(data, PRGArea.Area8000);
break;
case 36864:
snd_1.Write0(ref data);
break;
case 36866:
snd_1.Write1(ref data);
break;
case 36865:
snd_1.Write2(ref data);
break;
case 40960:
snd_2.Write0(ref data);
break;
case 40962:
snd_2.Write1(ref data);
break;
case 40961:
snd_2.Write2(ref data);
break;
case 45056:
snd_3.Write0(ref data);
break;
case 45058:
snd_3.Write1(ref data);
break;
case 45057:
snd_3.Write2(ref data);
break;
case 45059:
switch ((data & 0xC) >> 2)
{
case 0:
Switch01KNMTFromMirroring(Mirroring.Vert);
break;
case 1:
Switch01KNMTFromMirroring(Mirroring.Horz);
break;
case 2:
Switch01KNMTFromMirroring(Mirroring.OneScA);
break;
case 3:
Switch01KNMTFromMirroring(Mirroring.OneScB);
break;
}
break;
case 49152:
case 49153:
case 49154:
case 49155:
Switch08KPRG(data, PRGArea.AreaC000);
break;
case 53248:
Switch01KCHR(data, CHRArea.Area0000);
break;
case 53250:
Switch01KCHR(data, CHRArea.Area0400);
break;
case 53249:
Switch01KCHR(data, CHRArea.Area0800);
break;
case 53251:
Switch01KCHR(data, CHRArea.Area0C00);
break;
case 57344:
Switch01KCHR(data, CHRArea.Area1000);
break;
case 57346:
Switch01KCHR(data, CHRArea.Area1400);
break;
case 57345:
Switch01KCHR(data, CHRArea.Area1800);
break;
case 57347:
Switch01KCHR(data, CHRArea.Area1C00);
break;
case 61440:
irq_reload = data;
break;
case 61442:
irq_mode_cycle = (data & 4) == 4;
irq_enable = (data & 2) == 2;
irq_enable_on_ak = (data & 1) == 1;
if (irq_enable)
{
irq_counter = irq_reload;
prescaler = 341;
}
NesEmu.IRQFlags &= -9;
break;
case 61441:
NesEmu.IRQFlags &= -9;
irq_enable = irq_enable_on_ak;
break;
}
}
internal override void OnCPUClock()
{
if (!irq_enable)
{
return;
}
if (!irq_mode_cycle)
{
if (prescaler > 0)
{
prescaler -= 3;
return;
}
prescaler = 341;
irq_counter++;
if (irq_counter == 255)
{
NesEmu.IRQFlags |= 8;
irq_counter = irq_reload;
}
}
else
{
irq_counter++;
if (irq_counter == 255)
{
NesEmu.IRQFlags |= 8;
irq_counter = irq_reload;
}
}
}
internal override void OnAPUClockSingle()
{
base.OnAPUClockSingle();
snd_1.ClockSingle();
snd_2.ClockSingle();
snd_3.ClockSingle();
}
internal override void APUApplyChannelsSettings()
{
base.APUApplyChannelsSettings();
snd_1.Outputable = MyNesMain.RendererSettings.Audio_ChannelEnabled_VRC6_SQ1;
snd_2.Outputable = MyNesMain.RendererSettings.Audio_ChannelEnabled_VRC6_SQ2;
snd_3.Outputable = MyNesMain.RendererSettings.Audio_ChannelEnabled_VRC6_SAW;
}
internal override double APUGetSample()
{
return audio_pulse_table[snd_1.output + snd_2.output] + audio_tnd_table[snd_3.output];
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(irq_reload);
stream.Write(irq_counter);
stream.Write(prescaler);
stream.Write(irq_mode_cycle);
stream.Write(irq_enable);
stream.Write(irq_enable_on_ak);
snd_1.SaveState(ref stream);
snd_2.SaveState(ref stream);
snd_3.SaveState(ref stream);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
irq_reload = stream.ReadInt32();
irq_counter = stream.ReadInt32();
prescaler = stream.ReadInt32();
irq_mode_cycle = stream.ReadBoolean();
irq_enable = stream.ReadBoolean();
irq_enable_on_ak = stream.ReadBoolean();
snd_1.LoadState(ref stream);
snd_2.LoadState(ref stream);
snd_3.LoadState(ref stream);
}
}
}