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snes9xgx/source/snes9x/apu.cpp

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Original version off of which work began. Crunchy2's last release (2.0.1b8)
2008-08-06 03:09:59 +02:00
/**********************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
Jerremy Koot (jkoot@snes9x.com)
(c) Copyright 2002 - 2004 Matthew Kendora
(c) Copyright 2002 - 2005 Peter Bortas (peter@bortas.org)
(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
(c) Copyright 2001 - 2006 John Weidman (jweidman@slip.net)
(c) Copyright 2002 - 2006 Brad Jorsch (anomie@users.sourceforge.net),
funkyass (funkyass@spam.shaw.ca),
Kris Bleakley (codeviolation@hotmail.com),
Nach (n-a-c-h@users.sourceforge.net), and
zones (kasumitokoduck@yahoo.com)
BS-X C emulator code
(c) Copyright 2005 - 2006 Dreamer Nom,
zones
C4 x86 assembler and some C emulation code
(c) Copyright 2000 - 2003 _Demo_ (_demo_@zsnes.com),
Nach,
zsKnight (zsknight@zsnes.com)
C4 C++ code
(c) Copyright 2003 - 2006 Brad Jorsch,
Nach
DSP-1 emulator code
(c) Copyright 1998 - 2006 _Demo_,
Andreas Naive (andreasnaive@gmail.com)
Gary Henderson,
Ivar (ivar@snes9x.com),
John Weidman,
Kris Bleakley,
Matthew Kendora,
Nach,
neviksti (neviksti@hotmail.com)
DSP-2 emulator code
(c) Copyright 2003 John Weidman,
Kris Bleakley,
Lord Nightmare (lord_nightmare@users.sourceforge.net),
Matthew Kendora,
neviksti
DSP-3 emulator code
(c) Copyright 2003 - 2006 John Weidman,
Kris Bleakley,
Lancer,
z80 gaiden
DSP-4 emulator code
(c) Copyright 2004 - 2006 Dreamer Nom,
John Weidman,
Kris Bleakley,
Nach,
z80 gaiden
OBC1 emulator code
(c) Copyright 2001 - 2004 zsKnight,
pagefault (pagefault@zsnes.com),
Kris Bleakley,
Ported from x86 assembler to C by sanmaiwashi
SPC7110 and RTC C++ emulator code
(c) Copyright 2002 Matthew Kendora with research by
zsKnight,
John Weidman,
Dark Force
S-DD1 C emulator code
(c) Copyright 2003 Brad Jorsch with research by
Andreas Naive,
John Weidman
S-RTC C emulator code
(c) Copyright 2001-2006 byuu,
John Weidman
ST010 C++ emulator code
(c) Copyright 2003 Feather,
John Weidman,
Kris Bleakley,
Matthew Kendora
Super FX x86 assembler emulator code
(c) Copyright 1998 - 2003 _Demo_,
pagefault,
zsKnight,
Super FX C emulator code
(c) Copyright 1997 - 1999 Ivar,
Gary Henderson,
John Weidman
Sound DSP emulator code is derived from SNEeSe and OpenSPC:
(c) Copyright 1998 - 2003 Brad Martin
(c) Copyright 1998 - 2006 Charles Bilyue'
SH assembler code partly based on x86 assembler code
(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
2xSaI filter
(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
HQ2x filter
(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
Specific ports contains the works of other authors. See headers in
individual files.
Snes9x homepage: http://www.snes9x.com
Permission to use, copy, modify and/or distribute Snes9x in both binary
and source form, for non-commercial purposes, is hereby granted without
fee, providing that this license information and copyright notice appear
with all copies and any derived work.
This software is provided 'as-is', without any express or implied
warranty. In no event shall the authors be held liable for any damages
arising from the use of this software or it's derivatives.
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes,
but is not limited to, charging money for Snes9x or software derived from
Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
using Snes9x as a promotion for your commercial product.
The copyright holders request that bug fixes and improvements to the code
should be forwarded to them so everyone can benefit from the modifications
in future versions.
Super NES and Super Nintendo Entertainment System are trademarks of
Nintendo Co., Limited and its subsidiary companies.
**********************************************************************************/
#ifdef __DJGPP
#include <allegro.h>
#undef TRUE
#endif
#include "snes9x.h"
#include "spc700.h"
#include "apu.h"
#include "soundux.h"
#include "display.h"
#ifdef DEBUGGER
#include "cpuexec.h"
#endif
/* For note-triggered SPC dump support */
#include "snapshot.h"
extern int32 env_counter_table[32];
int spc_is_dumping=0;
int spc_is_dumping_temp;
uint8 spc_dump_dsp[0x100];
#ifdef DEBUGGER
void S9xTraceSoundDSP (const char *s, int i1 = 0, int i2 = 0, int i3 = 0,
int i4 = 0, int i5 = 0, int i6 = 0, int i7 = 0);
#endif
bool8 S9xInitAPU ()
{
IAPU.RAM = (uint8 *) malloc (0x10000);
IAPU.ShadowRAM = (uint8 *) malloc (0x10000);
IAPU.CachedSamples = (uint8 *) malloc (0x40000);
if (!IAPU.RAM || !IAPU.ShadowRAM || !IAPU.CachedSamples)
{
S9xDeinitAPU ();
return (FALSE);
}
memset(IAPU.RAM, 0, 0x10000);
memset(IAPU.ShadowRAM, 0, 0x10000);
memset(IAPU.CachedSamples, 0, 0x40000);
return (TRUE);
}
void S9xDeinitAPU ()
{
if (IAPU.RAM)
{
free ((char *) IAPU.RAM);
IAPU.RAM = NULL;
}
if (IAPU.ShadowRAM)
{
free ((char *) IAPU.ShadowRAM);
IAPU.ShadowRAM = NULL;
}
if (IAPU.CachedSamples)
{
free ((char *) IAPU.CachedSamples);
IAPU.CachedSamples = NULL;
}
}
EXTERN_C uint8 APUROM [64];
void S9xResetAPU ()
{
int i;
Settings.APUEnabled = Settings.NextAPUEnabled;
ZeroMemory(spc_dump_dsp, 0x100);
ZeroMemory(IAPU.RAM, 0x100);
memset(IAPU.RAM+0x20, 0xFF, 0x20);
memset(IAPU.RAM+0x60, 0xFF, 0x20);
memset(IAPU.RAM+0xA0, 0xFF, 0x20);
memset(IAPU.RAM+0xE0, 0xFF, 0x20);
for(i=1;i<256;i++)
{
memcpy(IAPU.RAM+(i<<8), IAPU.RAM, 0x100);
}
memcpy (IAPU.ShadowRAM, IAPU.RAM, 0x10000);
ZeroMemory (IAPU.CachedSamples, 0x40000);
ZeroMemory (APU.OutPorts, 4);
IAPU.DirectPage = IAPU.RAM;
memmove (&IAPU.RAM [0xffc0], APUROM, sizeof (APUROM));
memmove (APU.ExtraRAM, APUROM, sizeof (APUROM));
IAPU.PC = IAPU.RAM + IAPU.RAM [0xfffe] + (IAPU.RAM [0xffff] << 8);
APU.Cycles = 0;
APURegisters.YA.W = 0;
APURegisters.X = 0;
APURegisters.S = 0xff;
APURegisters.P = 0;
S9xAPUUnpackStatus ();
APURegisters.PC = 0;
IAPU.APUExecuting = Settings.APUEnabled;
#ifdef SPC700_SHUTDOWN
IAPU.WaitAddress1 = NULL;
IAPU.WaitAddress2 = NULL;
IAPU.WaitCounter = 0;
#endif
IAPU.NextAPUTimerPos = 0;
IAPU.APUTimerCounter = 0;
APU.ShowROM = TRUE;
IAPU.RAM [0xf1] = 0x80;
for (i = 0; i < 3; i++)
{
APU.TimerEnabled [i] = FALSE;
APU.TimerValueWritten [i] = 0;
APU.TimerTarget [i] = 0;
APU.Timer [i] = 0;
}
for (int j = 0; j < 0x80; j++)
APU.DSP [j] = 0;
IAPU.TwoCycles = IAPU.OneCycle * 2;
for (i = 0; i < 256; i++)
S9xAPUCycles [i] = S9xAPUCycleLengths [i] * IAPU.OneCycle;
APU.DSP [APU_ENDX] = 0;
APU.DSP [APU_KOFF] = 0;
APU.DSP [APU_KON] = 0;
APU.DSP [APU_FLG] = APU_MUTE | APU_ECHO_DISABLED;
APU.KeyedChannels = 0;
S9xResetSound (TRUE);
S9xSetEchoEnable (0);
}
void S9xSetAPUDSP (uint8 byte)
{
uint8 reg = IAPU.RAM [0xf2];
static uint8 KeyOn;
static uint8 KeyOnPrev;
spc_dump_dsp[reg] = byte;
switch (reg)
{
case APU_FLG:
if (byte & APU_SOFT_RESET)
{
APU.DSP [reg] = APU_MUTE | APU_ECHO_DISABLED | (byte & 0x1f);
APU.DSP [APU_ENDX] = 0;
APU.DSP [APU_KOFF] = 0;
APU.DSP [APU_KON] = 0;
S9xSetEchoWriteEnable (FALSE);
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] DSP reset\n", ICPU.Scanline);
#endif
// Kill sound
S9xResetSound (FALSE);
}
else
{
S9xSetEchoWriteEnable (!(byte & APU_ECHO_DISABLED));
if (byte & APU_MUTE)
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Mute sound\n", ICPU.Scanline);
#endif
S9xSetSoundMute (TRUE);
}
else
S9xSetSoundMute (FALSE);
SoundData.noise_rate = env_counter_table[byte & 0x1f];
}
break;
case APU_NON:
if (byte != APU.DSP [APU_NON])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Noise:", ICPU.Scanline);
#endif
uint8 mask = 1;
for (int c = 0; c < 8; c++, mask <<= 1)
{
int type;
if (byte & mask)
{
type = SOUND_NOISE;
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
{
if (APU.DSP [reg] & mask)
S9xTraceSoundDSP ("%d,", c);
else
S9xTraceSoundDSP ("%d(on),", c);
}
#endif
}
else
{
type = SOUND_SAMPLE;
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
{
if (APU.DSP [reg] & mask)
S9xTraceSoundDSP ("%d(off),", c);
}
#endif
}
S9xSetSoundType (c, type);
}
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("\n");
#endif
}
break;
case APU_MVOL_LEFT:
if (byte != APU.DSP [APU_MVOL_LEFT])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Master volume left:%d\n",
ICPU.Scanline, (signed char) byte);
#endif
S9xSetMasterVolume ((signed char) byte,
(signed char) APU.DSP [APU_MVOL_RIGHT]);
}
break;
case APU_MVOL_RIGHT:
if (byte != APU.DSP [APU_MVOL_RIGHT])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Master volume right:%d\n",
ICPU.Scanline, (signed char) byte);
#endif
S9xSetMasterVolume ((signed char) APU.DSP [APU_MVOL_LEFT],
(signed char) byte);
}
break;
case APU_EVOL_LEFT:
if (byte != APU.DSP [APU_EVOL_LEFT])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Echo volume left:%d\n",
ICPU.Scanline, (signed char) byte);
#endif
S9xSetEchoVolume ((signed char) byte,
(signed char) APU.DSP [APU_EVOL_RIGHT]);
}
break;
case APU_EVOL_RIGHT:
if (byte != APU.DSP [APU_EVOL_RIGHT])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Echo volume right:%d\n",
ICPU.Scanline, (signed char) byte);
#endif
S9xSetEchoVolume ((signed char) APU.DSP [APU_EVOL_LEFT],
(signed char) byte);
}
break;
case APU_ENDX:
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Reset ENDX\n", ICPU.Scanline);
#endif
byte = 0;
break;
case APU_KOFF:
// if (byte)
{
uint8 mask = 1;
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Key off:", ICPU.Scanline);
#endif
for (int c = 0; c < 8; c++, mask <<= 1)
{
if ((byte & mask) != 0)
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("%d,", c);
#endif
if (APU.KeyedChannels & mask)
{
{
KeyOnPrev&=~mask;
APU.KeyedChannels &= ~mask;
APU.DSP [APU_KON] &= ~mask;
//APU.DSP [APU_KOFF] |= mask;
S9xSetSoundKeyOff (c);
}
}
}
else if((KeyOnPrev&mask)!=0)
{
KeyOnPrev&=~mask;
APU.KeyedChannels |= mask;
//APU.DSP [APU_KON] |= mask;
APU.DSP [APU_KOFF] &= ~mask;
APU.DSP [APU_ENDX] &= ~mask;
S9xPlaySample (c);
}
}
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("\n");
#endif
}
//KeyOnPrev=0;
APU.DSP [APU_KOFF] = byte;
return;
case APU_KON:
if (spc_is_dumping)
{
if (byte & ~spc_is_dumping_temp)
{
APURegisters.PC = IAPU.PC - IAPU.RAM;
S9xAPUPackStatus();
#ifndef NGC
S9xSPCDump (S9xGetFilenameInc((".spc"), SPC_DIR));
#endif
spc_is_dumping = 0;
}
}
if (byte)
{
uint8 mask = 1;
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Key on:", ICPU.Scanline);
#endif
for (int c = 0; c < 8; c++, mask <<= 1)
{
if ((byte & mask) != 0)
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("%d,", c);
#endif
// Pac-In-Time requires that channels can be key-on
// regardeless of their current state.
if((APU.DSP [APU_KOFF] & mask) ==0)
{
KeyOnPrev&=~mask;
APU.KeyedChannels |= mask;
//APU.DSP [APU_KON] |= mask;
//APU.DSP [APU_KOFF] &= ~mask;
APU.DSP [APU_ENDX] &= ~mask;
S9xPlaySample (c);
}
else KeyOn|=mask;
}
}
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("\n");
#endif
}
spc_is_dumping_temp = byte;
return;
case APU_VOL_LEFT + 0x00:
case APU_VOL_LEFT + 0x10:
case APU_VOL_LEFT + 0x20:
case APU_VOL_LEFT + 0x30:
case APU_VOL_LEFT + 0x40:
case APU_VOL_LEFT + 0x50:
case APU_VOL_LEFT + 0x60:
case APU_VOL_LEFT + 0x70:
// At Shin Megami Tensei suggestion 6/11/00
// if (byte != APU.DSP [reg])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] %d volume left: %d\n",
ICPU.Scanline, reg>>4, (signed char) byte);
#endif
S9xSetSoundVolume (reg >> 4, (signed char) byte,
(signed char) APU.DSP [reg + 1]);
}
break;
case APU_VOL_RIGHT + 0x00:
case APU_VOL_RIGHT + 0x10:
case APU_VOL_RIGHT + 0x20:
case APU_VOL_RIGHT + 0x30:
case APU_VOL_RIGHT + 0x40:
case APU_VOL_RIGHT + 0x50:
case APU_VOL_RIGHT + 0x60:
case APU_VOL_RIGHT + 0x70:
// At Shin Megami Tensei suggestion 6/11/00
// if (byte != APU.DSP [reg])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] %d volume right: %d\n",
ICPU.Scanline, reg >>4, (signed char) byte);
#endif
S9xSetSoundVolume (reg >> 4, (signed char) APU.DSP [reg - 1],
(signed char) byte);
}
break;
case APU_P_LOW + 0x00:
case APU_P_LOW + 0x10:
case APU_P_LOW + 0x20:
case APU_P_LOW + 0x30:
case APU_P_LOW + 0x40:
case APU_P_LOW + 0x50:
case APU_P_LOW + 0x60:
case APU_P_LOW + 0x70:
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] %d freq low: %d\n",
ICPU.Scanline, reg>>4, byte);
#endif
S9xSetSoundHertz (reg >> 4, ((byte + (APU.DSP [reg + 1] << 8)) & FREQUENCY_MASK) * 8);
break;
case APU_P_HIGH + 0x00:
case APU_P_HIGH + 0x10:
case APU_P_HIGH + 0x20:
case APU_P_HIGH + 0x30:
case APU_P_HIGH + 0x40:
case APU_P_HIGH + 0x50:
case APU_P_HIGH + 0x60:
case APU_P_HIGH + 0x70:
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] %d freq high: %d\n",
ICPU.Scanline, reg>>4, byte);
#endif
S9xSetSoundHertz (reg >> 4,
(((byte << 8) + APU.DSP [reg - 1]) & FREQUENCY_MASK) * 8);
break;
case APU_SRCN + 0x00:
case APU_SRCN + 0x10:
case APU_SRCN + 0x20:
case APU_SRCN + 0x30:
case APU_SRCN + 0x40:
case APU_SRCN + 0x50:
case APU_SRCN + 0x60:
case APU_SRCN + 0x70:
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] %d sample number: %d\n",
ICPU.Scanline, reg>>4, byte);
#endif
break;
case APU_ADSR1 + 0x00:
case APU_ADSR1 + 0x10:
case APU_ADSR1 + 0x20:
case APU_ADSR1 + 0x30:
case APU_ADSR1 + 0x40:
case APU_ADSR1 + 0x50:
case APU_ADSR1 + 0x60:
case APU_ADSR1 + 0x70:
if (byte != APU.DSP [reg])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] %d adsr1: %02x\n",
ICPU.Scanline, reg>>4, byte);
#endif
{
S9xFixEnvelope (reg >> 4, APU.DSP [reg + 2], byte,
APU.DSP [reg + 1]);
}
}
break;
case APU_ADSR2 + 0x00:
case APU_ADSR2 + 0x10:
case APU_ADSR2 + 0x20:
case APU_ADSR2 + 0x30:
case APU_ADSR2 + 0x40:
case APU_ADSR2 + 0x50:
case APU_ADSR2 + 0x60:
case APU_ADSR2 + 0x70:
if (byte != APU.DSP [reg])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] %d adsr2: %02x\n",
ICPU.Scanline, reg>>4, byte);
#endif
{
S9xFixEnvelope (reg >> 4, APU.DSP [reg + 1], APU.DSP [reg - 1],
byte);
}
}
break;
case APU_GAIN + 0x00:
case APU_GAIN + 0x10:
case APU_GAIN + 0x20:
case APU_GAIN + 0x30:
case APU_GAIN + 0x40:
case APU_GAIN + 0x50:
case APU_GAIN + 0x60:
case APU_GAIN + 0x70:
if (byte != APU.DSP [reg])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] %d gain: %02x\n",
ICPU.Scanline, reg>>4, byte);
#endif
{
S9xFixEnvelope (reg >> 4, byte, APU.DSP [reg - 2],
APU.DSP [reg - 1]);
}
}
break;
case APU_ENVX + 0x00:
case APU_ENVX + 0x10:
case APU_ENVX + 0x20:
case APU_ENVX + 0x30:
case APU_ENVX + 0x40:
case APU_ENVX + 0x50:
case APU_ENVX + 0x60:
case APU_ENVX + 0x70:
break;
case APU_OUTX + 0x00:
case APU_OUTX + 0x10:
case APU_OUTX + 0x20:
case APU_OUTX + 0x30:
case APU_OUTX + 0x40:
case APU_OUTX + 0x50:
case APU_OUTX + 0x60:
case APU_OUTX + 0x70:
break;
case APU_DIR:
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
S9xTraceSoundDSP ("[%d] Sample directory to: %02x\n",
ICPU.Scanline, byte);
#endif
break;
case APU_PMON:
if (byte != APU.DSP [APU_PMON])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
{
S9xTraceSoundDSP ("[%d] FreqMod:", ICPU.Scanline);
uint8 mask = 1;
for (int c = 0; c < 8; c++, mask <<= 1)
{
if (byte & mask)
{
if (APU.DSP [reg] & mask)
S9xTraceSoundDSP ("%d", c);
else
S9xTraceSoundDSP ("%d(on),", c);
}
else
{
if (APU.DSP [reg] & mask)
S9xTraceSoundDSP ("%d(off),", c);
}
}
S9xTraceSoundDSP ("\n");
}
#endif
S9xSetFrequencyModulationEnable (byte);
}
break;
case APU_EON:
if (byte != APU.DSP [APU_EON])
{
#ifdef DEBUGGER
if (Settings.TraceSoundDSP)
{
S9xTraceSoundDSP ("[%d] Echo:", ICPU.Scanline);
uint8 mask = 1;
for (int c = 0; c < 8; c++, mask <<= 1)
{
if (byte & mask)
{
if (APU.DSP [reg] & mask)
S9xTraceSoundDSP ("%d", c);
else
S9xTraceSoundDSP ("%d(on),", c);
}
else
{
if (APU.DSP [reg] & mask)
S9xTraceSoundDSP ("%d(off),", c);
}
}
S9xTraceSoundDSP ("\n");
}
#endif
S9xSetEchoEnable (byte);
}
break;
case APU_EFB:
S9xSetEchoFeedback ((signed char) byte);
break;
case APU_ESA:
break;
case APU_EDL:
S9xSetEchoDelay (byte & 0xf);
break;
case APU_C0:
case APU_C1:
case APU_C2:
case APU_C3:
case APU_C4:
case APU_C5:
case APU_C6:
case APU_C7:
S9xSetFilterCoefficient (reg >> 4, (signed char) byte);
break;
default:
// XXX
//printf ("Write %02x to unknown APU register %02x\n", byte, reg);
break;
}
KeyOnPrev|=KeyOn;
KeyOn=0;
if (reg < 0x80)
APU.DSP [reg] = byte;
}
void S9xFixEnvelope (int channel, uint8 gain, uint8 adsr1, uint8 adsr2)
{
if (adsr1 & 0x80)
{
if (S9xSetSoundMode (channel, MODE_ADSR))
S9xSetSoundADSR (channel, adsr1 & 0xf, (adsr1 >> 4) & 7,
adsr2 & 0x1f, (adsr2 >> 5) & 7);
}
else
{
if ((gain & 0x80) == 0)
{
if (S9xSetSoundMode (channel, MODE_GAIN))
S9xSetEnvelopeHeight (channel, (gain & 0x7f) << ENV_SHIFT);
}
else
{
if (gain & 0x40)
{
if (S9xSetSoundMode (channel, (gain & 0x20) ?
MODE_INCREASE_BENT_LINE : MODE_INCREASE_LINEAR))
S9xSetEnvelopeRate (channel, env_counter_table[gain & 0x1f], ENV_MAX);
}
else
{
if (S9xSetSoundMode (channel, (gain & 0x20) ?
MODE_DECREASE_EXPONENTIAL : MODE_DECREASE_LINEAR))
S9xSetEnvelopeRate (channel, env_counter_table[gain & 0x1f], 0);
}
}
}
}
void S9xSetAPUControl (uint8 byte)
{
//if (byte & 0x40)
//printf ("*** Special SPC700 timing enabled\n");
if ((byte & 1) != 0 && !APU.TimerEnabled [0])
{
APU.Timer [0] = 0;
IAPU.RAM [0xfd] = 0;
if ((APU.TimerTarget [0] = IAPU.RAM [0xfa]) == 0)
APU.TimerTarget [0] = 0x100;
}
if ((byte & 2) != 0 && !APU.TimerEnabled [1])
{
APU.Timer [1] = 0;
IAPU.RAM [0xfe] = 0;
if ((APU.TimerTarget [1] = IAPU.RAM [0xfb]) == 0)
APU.TimerTarget [1] = 0x100;
}
if ((byte & 4) != 0 && !APU.TimerEnabled [2])
{
APU.Timer [2] = 0;
IAPU.RAM [0xff] = 0;
if ((APU.TimerTarget [2] = IAPU.RAM [0xfc]) == 0)
APU.TimerTarget [2] = 0x100;
}
APU.TimerEnabled [0] = byte & 1;
APU.TimerEnabled [1] = (byte & 2) >> 1;
APU.TimerEnabled [2] = (byte & 4) >> 2;
if (byte & 0x10)
IAPU.RAM [0xF4] = IAPU.RAM [0xF5] = 0;
if (byte & 0x20)
IAPU.RAM [0xF6] = IAPU.RAM [0xF7] = 0;
if (byte & 0x80)
{
if (!APU.ShowROM)
{
memmove (&IAPU.RAM [0xffc0], APUROM, sizeof (APUROM));
APU.ShowROM = TRUE;
}
}
else
{
if (APU.ShowROM)
{
APU.ShowROM = FALSE;
memmove (&IAPU.RAM [0xffc0], APU.ExtraRAM, sizeof (APUROM));
}
}
IAPU.RAM [0xf1] = byte;
}
void S9xSetAPUTimer (uint16 Address, uint8 byte)
{
IAPU.RAM [Address] = byte;
switch (Address)
{
case 0xfa:
if ((APU.TimerTarget [0] = IAPU.RAM [0xfa]) == 0)
APU.TimerTarget [0] = 0x100;
APU.TimerValueWritten [0] = TRUE;
break;
case 0xfb:
if ((APU.TimerTarget [1] = IAPU.RAM [0xfb]) == 0)
APU.TimerTarget [1] = 0x100;
APU.TimerValueWritten [1] = TRUE;
break;
case 0xfc:
if ((APU.TimerTarget [2] = IAPU.RAM [0xfc]) == 0)
APU.TimerTarget [2] = 0x100;
APU.TimerValueWritten [2] = TRUE;
break;
}
}
void S9xUpdateAPUTimer (void)
{
while ((CPU.Cycles << SNES_APUTIMER_ACCURACY) >= IAPU.NextAPUTimerPos)
{
IAPU.NextAPUTimerPos += SNES_APUTIMER2_CYCLE_SHIFT;
if (APU.TimerEnabled [2])
{
APU.Timer [2] ++;
if (APU.Timer [2] >= APU.TimerTarget [2])
{
IAPU.RAM [0xff] = (IAPU.RAM [0xff] + 1) & 0xf;
APU.Timer [2] = 0;
#ifdef SPC700_SHUTDOWN
IAPU.WaitCounter++;
IAPU.APUExecuting = TRUE;
#endif
}
}
if (++IAPU.APUTimerCounter == 8)
{
IAPU.APUTimerCounter = 0;
if (APU.TimerEnabled [0])
{
APU.Timer [0]++;
if (APU.Timer [0] >= APU.TimerTarget [0])
{
IAPU.RAM [0xfd] = (IAPU.RAM [0xfd] + 1) & 0xf;
APU.Timer [0] = 0;
#ifdef SPC700_SHUTDOWN
IAPU.WaitCounter++;
IAPU.APUExecuting = TRUE;
#endif
}
}
if (APU.TimerEnabled [1])
{
APU.Timer [1]++;
if (APU.Timer [1] >= APU.TimerTarget [1])
{
IAPU.RAM [0xfe] = (IAPU.RAM [0xfe] + 1) & 0xf;
APU.Timer [1] = 0;
#ifdef SPC700_SHUTDOWN
IAPU.WaitCounter++;
IAPU.APUExecuting = TRUE;
#endif
}
}
}
}
}
uint8 S9xGetAPUDSP ()
{
uint8 reg = IAPU.RAM [0xf2] & 0x7f;
uint8 byte = APU.DSP [reg];
switch (reg)
{
case APU_KON:
break;
case APU_KOFF:
break;
case APU_OUTX + 0x00:
case APU_OUTX + 0x10:
case APU_OUTX + 0x20:
case APU_OUTX + 0x30:
case APU_OUTX + 0x40:
case APU_OUTX + 0x50:
case APU_OUTX + 0x60:
case APU_OUTX + 0x70:
if (SoundData.channels [reg >> 4].state == SOUND_SILENT)
return (0);
return (int8) (SoundData.channels [reg >> 4].out_sample >> 8);
case APU_ENVX + 0x00:
case APU_ENVX + 0x10:
case APU_ENVX + 0x20:
case APU_ENVX + 0x30:
case APU_ENVX + 0x40:
case APU_ENVX + 0x50:
case APU_ENVX + 0x60:
case APU_ENVX + 0x70:
return (S9xGetEnvelopeHeight (reg >> 4));
case APU_ENDX:
// To fix speech in Magical Drop 2 6/11/00
// APU.DSP [APU_ENDX] = 0;
break;
default:
break;
}
return (byte);
}
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