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NES Fix APU 

Finally fixes the infamously bad APU mixer tests
This commit is contained in:
alyosha-tas 2017-06-08 14:35:13 -04:00 committed by GitHub
parent fd3683c3cd
commit ff980b91dd
1 changed files with 19 additions and 40 deletions
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59
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/APU.cs
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@ -433,7 +433,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
ser.EndSection();
}
public bool IsLenCntNonZero() { return len_cnt > 0; }
public void WriteReg(int addr, byte val)
@ -508,8 +507,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
else env_counter--;
}
}
}
public void clock_length_and_sweep()
{
@ -561,7 +560,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
//misc..
int lenctr_en;
int linear_counter, timer, timer_cnt_reload;
int seq = 15;
int seq = 0;
public int sample;
APU apu;
@ -655,42 +654,37 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
//except when linear counter or
//length counter is 0
//dont stop the triangle channel until its level is 0. makes it sound nicer.
bool need_declick = (seq != 16 && seq != 15);
bool en = len_cnt != 0 && linear_counter != 0 || need_declick;
bool en = len_cnt != 0 && linear_counter != 0;
//length counter and linear counter
//is clocked in frame counter.
if (en)
bool do_clock = false;
if (timer > 0) timer--;
if (timer == 0)
{
do_clock = true;
timer = timer_cnt_reload;
}
if (en && do_clock)
{
int newsample;
if (timer > 0) timer--;
if (timer == 0)
{
seq = (seq + 1) & 0x1F;
timer = timer_cnt_reload;
}
if (CFG_DECLICK) // this looks ugly...
newsample = TRIANGLE_TABLE[(seq + 8) & 0x1F];
else
newsample = TRIANGLE_TABLE[seq];
seq = (seq + 1) & 0x1F;
newsample = TRIANGLE_TABLE[seq];
//special hack: frequently, games will use the maximum frequency triangle in order to mute it
//apparently this results in the DAC for the triangle wave outputting a steady level at about 7.5
//so we'll emulate it at the digital level
if (timer_cnt_reload == 1) newsample = 8;
//newsample -= 8; //unbias
if (newsample != sample)
{
apu.recalculate = true;
sample = newsample;
}
}
}
public void clock_length_and_sweep()
{
//env_loopdoubles as "halt length counter"
@ -800,9 +794,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
//Any time the sample buffer is in an empty state and bytes remaining is not zero, the following occur:
// also note that the halt for DMC DMA occurs on APU cycles only (hence the timer check)
if (!sample_buffer_filled && sample_length > 0 && apu.dmc_dma_countdown == -1 && delay==0)
{
// calls from write take one less cycle, but start on a write instead of a read
@ -850,7 +841,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
}
}
void Clock()
{
//If the silence flag is clear, bit 0 of the shift register is applied to the counter as follows:
@ -869,7 +859,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
if (out_deltacounter > 1)
out_deltacounter -= 2;
}
//apu.nes.LogLine("dmc out sample: {0}", out_deltacounter);
//Console.WriteLine("dmc out sample: {0}", out_deltacounter);
apu.recalculate = true;
}
@ -896,8 +886,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
}
}
else out_bits_remaining--;
}
public void set_lenctr_en(bool en)
@ -1012,7 +1000,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
ser.Sync("sequencer_irq_flag", ref sequencer_irq_flag);
ser.Sync("len_clock_active", ref len_clock_active);
pulse[0].SyncState(ser);
pulse[1].SyncState(ser);
triangle.SyncState(ser);
@ -1070,7 +1057,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
new int[]{8313,16627,24939,33254,41566}
};
void sequencer_write_tick(byte val)
{
if (seq_tick>0)
@ -1193,7 +1179,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
}
sequencer_counter = 0;
sequencer_step = 0;
}
public void NESHardReset()
@ -1202,7 +1187,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
// that translates to a starting value for the counter of -2
sequencer_counter = -2;
}
public void WriteReg(int addr, byte val)
@ -1261,7 +1245,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
}
}
public byte PeekReg(int addr)
{
switch (addr)
@ -1308,7 +1291,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
int pending_length_change;
public void RunOne(bool read)
{
if (read)
@ -1401,7 +1383,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
}
}
}
public struct Delta
@ -1414,6 +1395,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
this.value = value;
}
}
public List<Delta> dlist = new List<Delta>();
/// <summary>only call in board.ClockCPU()</summary>
@ -1428,7 +1410,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
int oldmix = 0;
void EmitSample()
{
if (recalculate)
@ -1440,6 +1421,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
int s_tri = triangle.sample;
int s_noise = noise.sample;
int s_dmc = dmc.sample;
//int s_ext = 0; //gamepak
/*
@ -1463,12 +1445,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
//this needs to leave enough headroom for straying DC bias due to the DMC unit getting stuck outputs. smb3 is bad about that.
int mix = (int)(20000 * output);
dlist.Add(new Delta(sampleclock, mix - oldmix));
oldmix = mix;
}
sampleclock++;
}