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snes9xgx/source/snes9x/apu/apu.cpp
dborth ee2277f76f finalize 4.2.1
2010-07-15 03:52:42 +00:00

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/***********************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com),
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 funkyass (funkyass@spam.shaw.ca),
Kris Bleakley (codeviolation@hotmail.com)
(c) Copyright 2002 - 2010 Brad Jorsch (anomie@users.sourceforge.net),
Nach (n-a-c-h@users.sourceforge.net),
zones (kasumitokoduck@yahoo.com)
(c) Copyright 2006 - 2007 nitsuja
(c) Copyright 2009 - 2010 BearOso,
OV2
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 used in 1.39-1.51
(c) Copyright 2002 Matthew Kendora with research by
zsKnight,
John Weidman,
Dark Force
SPC7110 and RTC C++ emulator code used in 1.52+
(c) Copyright 2009 byuu,
neviksti
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 emulator code used in 1.5-1.51
(c) Copyright 1998 - 2003 Brad Martin
(c) Copyright 1998 - 2006 Charles Bilyue'
Sound emulator code used in 1.52+
(c) Copyright 2004 - 2007 Shay Green (gblargg@gmail.com)
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, HQ3x, HQ4x filters
(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
NTSC filter
(c) Copyright 2006 - 2007 Shay Green
GTK+ GUI code
(c) Copyright 2004 - 2010 BearOso
Win32 GUI code
(c) Copyright 2003 - 2006 blip,
funkyass,
Matthew Kendora,
Nach,
nitsuja
(c) Copyright 2009 - 2010 OV2
Mac OS GUI code
(c) Copyright 1998 - 2001 John Stiles
(c) Copyright 2001 - 2010 zones
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.
***********************************************************************************/
#include <math.h>
#include "snes9x.h"
#include "apu.h"
#include "snapshot.h"
#include "display.h"
#include "linear_resampler.h"
#include "hermite_resampler.h"
#define APU_DEFAULT_INPUT_RATE 32000
#define APU_MINIMUM_SAMPLE_COUNT 512
#define APU_MINIMUM_SAMPLE_BLOCK 128
#define APU_NUMERATOR_NTSC 15664
#define APU_DENOMINATOR_NTSC 328125
#define APU_NUMERATOR_PAL 34176
#define APU_DENOMINATOR_PAL 709379
#define APU_DEFAULT_RESAMPLER HermiteResampler
SNES_SPC *spc_core = NULL;
static uint8 APUROM[64] =
{
0xCD, 0xEF, 0xBD, 0xE8, 0x00, 0xC6, 0x1D, 0xD0,
0xFC, 0x8F, 0xAA, 0xF4, 0x8F, 0xBB, 0xF5, 0x78,
0xCC, 0xF4, 0xD0, 0xFB, 0x2F, 0x19, 0xEB, 0xF4,
0xD0, 0xFC, 0x7E, 0xF4, 0xD0, 0x0B, 0xE4, 0xF5,
0xCB, 0xF4, 0xD7, 0x00, 0xFC, 0xD0, 0xF3, 0xAB,
0x01, 0x10, 0xEF, 0x7E, 0xF4, 0x10, 0xEB, 0xBA,
0xF6, 0xDA, 0x00, 0xBA, 0xF4, 0xC4, 0xF4, 0xDD,
0x5D, 0xD0, 0xDB, 0x1F, 0x00, 0x00, 0xC0, 0xFF
};
namespace spc
{
static apu_callback sa_callback = NULL;
static void *extra_data = NULL;
static bool8 sound_in_sync = TRUE;
static bool8 sound_enabled = FALSE;
static int buffer_size;
static int lag_master = 0;
static int lag = 0;
static uint8 *landing_buffer = NULL;
static uint8 *shrink_buffer = NULL;
static Resampler *resampler = NULL;
static int32 reference_time;
static uint32 remainder;
static const int timing_hack_numerator = SNES_SPC::tempo_unit;
static int timing_hack_denominator = SNES_SPC::tempo_unit;
/* Set these to NTSC for now. Will change to PAL in S9xAPUTimingSetSpeedup
if necessary on game load. */
static uint32 ratio_numerator = APU_NUMERATOR_NTSC;
static uint32 ratio_denominator = APU_DENOMINATOR_NTSC;
}
static void EightBitize (uint8 *, int);
static void DeStereo (uint8 *, int);
static void ReverseStereo (uint8 *, int);
void UpdatePlaybackRate (void);
static void from_apu_to_state (uint8 **, void *, size_t);
static void to_apu_from_state (uint8 **, void *, size_t);
static void SPCSnapshotCallback (void);
static inline int S9xAPUGetClock (int32);
static inline int S9xAPUGetClockRemainder (int32);
static void EightBitize (uint8 *buffer, int sample_count)
{
uint8 *buf8 = (uint8 *) buffer;
int16 *buf16 = (int16 *) buffer;
for (int i = 0; i < sample_count; i++)
buf8[i] = (uint8) ((buf16[i] / 256) + 128);
}
static void DeStereo (uint8 *buffer, int sample_count)
{
int16 *buf = (int16 *) buffer;
int32 s1, s2;
for (int i = 0; i < sample_count >> 1; i++)
{
s1 = (int32) buf[2 * i];
s2 = (int32) buf[2 * i + 1];
buf[i] = (int16) ((s1 + s2) >> 1);
}
}
static void ReverseStereo (uint8 *src_buffer, int sample_count)
{
int16 *buffer = (int16 *) src_buffer;
for (int i = 0; i < sample_count; i += 2)
{
buffer[i + 1] ^= buffer[i];
buffer[i] ^= buffer[i + 1];
buffer[i + 1] ^= buffer[i];
}
}
bool8 S9xMixSamples (uint8 *buffer, int sample_count)
{
static int shrink_buffer_size = -1;
uint8 *dest;
if (!Settings.SixteenBitSound || !Settings.Stereo)
{
/* We still need both stereo samples for generating the mono sample */
if (!Settings.Stereo)
sample_count <<= 1;
/* We still have to generate 16-bit samples for bit-dropping, too */
if (shrink_buffer_size < (sample_count << 1))
{
delete[] spc::shrink_buffer;
spc::shrink_buffer = new uint8[sample_count << 1];
shrink_buffer_size = sample_count << 1;
}
dest = spc::shrink_buffer;
}
else
dest = buffer;
if (Settings.Mute)
{
memset(dest, 0, sample_count << 1);
spc::resampler->clear();
return (FALSE);
}
else
{
if (spc::resampler->avail() >= (sample_count + spc::lag))
{
spc::resampler->read((short *) dest, sample_count);
if (spc::lag == spc::lag_master)
spc::lag = 0;
}
else
{
memset(buffer, (Settings.SixteenBitSound ? 0 : 128), (sample_count << (Settings.SixteenBitSound ? 1 : 0)) >> (Settings.Stereo ? 0 : 1));
if (spc::lag == 0)
spc::lag = spc::lag_master;
return (FALSE);
}
}
if (Settings.ReverseStereo && Settings.Stereo)
ReverseStereo(dest, sample_count);
if (!Settings.Stereo || !Settings.SixteenBitSound)
{
if (!Settings.Stereo)
{
DeStereo(dest, sample_count);
sample_count >>= 1;
}
if (!Settings.SixteenBitSound)
EightBitize(dest, sample_count);
memcpy(buffer, dest, (sample_count << (Settings.SixteenBitSound ? 1 : 0)));
}
return (TRUE);
}
int S9xGetSampleCount (void)
{
return (spc::resampler->avail() >> (Settings.Stereo ? 0 : 1));
}
void S9xFinalizeSamples (void)
{
if (!Settings.Mute)
{
if (!spc::resampler->push((short *) spc::landing_buffer, spc_core->sample_count()))
{
/* We weren't able to process the entire buffer. Potential overrun. */
spc::sound_in_sync = FALSE;
if (Settings.SoundSync && !Settings.TurboMode)
return;
}
}
if (!Settings.SoundSync || Settings.TurboMode || Settings.Mute)
spc::sound_in_sync = TRUE;
else
if (spc::resampler->space_empty() >= spc::resampler->space_filled())
spc::sound_in_sync = TRUE;
else
spc::sound_in_sync = FALSE;
spc_core->set_output((SNES_SPC::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
}
void S9xLandSamples (void)
{
if (spc::sa_callback != NULL)
spc::sa_callback(spc::extra_data);
else
S9xFinalizeSamples();
}
void S9xClearSamples (void)
{
spc::resampler->clear();
spc::lag = spc::lag_master;
}
bool8 S9xSyncSound (void)
{
if (!Settings.SoundSync || spc::sound_in_sync)
return (TRUE);
S9xLandSamples();
return (spc::sound_in_sync);
}
void S9xSetSamplesAvailableCallback (apu_callback callback, void *data)
{
spc::sa_callback = callback;
spc::extra_data = data;
}
void UpdatePlaybackRate (void)
{
if (Settings.SoundInputRate == 0)
Settings.SoundInputRate = APU_DEFAULT_INPUT_RATE;
double time_ratio = (double) Settings.SoundInputRate * spc::timing_hack_numerator / (Settings.SoundPlaybackRate * spc::timing_hack_denominator);
spc::resampler->time_ratio(time_ratio);
}
bool8 S9xInitSound (int buffer_ms, int lag_ms)
{
// buffer_ms : buffer size given in millisecond
// lag_ms : allowable time-lag given in millisecond
int sample_count = buffer_ms * 32000 / 1000;
int lag_sample_count = lag_ms * 32000 / 1000;
spc::lag_master = lag_sample_count;
if (Settings.Stereo)
spc::lag_master <<= 1;
spc::lag = spc::lag_master;
if (sample_count < APU_MINIMUM_SAMPLE_COUNT)
sample_count = APU_MINIMUM_SAMPLE_COUNT;
spc::buffer_size = sample_count;
if (Settings.Stereo)
spc::buffer_size <<= 1;
if (Settings.SixteenBitSound)
spc::buffer_size <<= 1;
printf("Sound buffer size: %d (%d samples)\n", spc::buffer_size, sample_count);
if (spc::landing_buffer)
delete[] spc::landing_buffer;
spc::landing_buffer = new uint8[spc::buffer_size * 2];
if (!spc::landing_buffer)
return (FALSE);
/* The resampler and spc unit use samples (16-bit short) as
arguments. Use 2x in the resampler for buffer leveling with SoundSync */
if (!spc::resampler)
{
spc::resampler = new APU_DEFAULT_RESAMPLER(spc::buffer_size >> (Settings.SoundSync ? 0 : 1));
if (!spc::resampler)
{
delete[] spc::landing_buffer;
return (FALSE);
}
}
else
spc::resampler->resize(spc::buffer_size >> (Settings.SoundSync ? 0 : 1));
spc_core->set_output((SNES_SPC::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
UpdatePlaybackRate();
spc::sound_enabled = S9xOpenSoundDevice();
return (spc::sound_enabled);
}
void S9xSetSoundControl (uint8 voice_switch)
{
spc_core->dsp_set_stereo_switch(voice_switch << 8 | voice_switch);
}
void S9xSetSoundMute (bool8 mute)
{
Settings.Mute = mute;
if (!spc::sound_enabled)
Settings.Mute = TRUE;
}
void S9xDumpSPCSnapshot (void)
{
spc_core->dsp_dump_spc_snapshot();
}
static void SPCSnapshotCallback (void)
{
S9xSPCDump(S9xGetFilenameInc((".spc"), SPC_DIR));
printf("Dumped key-on triggered spc snapshot.\n");
}
bool8 S9xInitAPU (void)
{
spc_core = new SNES_SPC;
if (!spc_core)
return (FALSE);
spc_core->init();
spc_core->init_rom(APUROM);
spc_core->dsp_set_spc_snapshot_callback(SPCSnapshotCallback);
spc::landing_buffer = NULL;
spc::shrink_buffer = NULL;
spc::resampler = NULL;
return (TRUE);
}
void S9xDeinitAPU (void)
{
if (spc_core)
{
delete spc_core;
spc_core = NULL;
}
if (spc::resampler)
{
delete spc::resampler;
spc::resampler = NULL;
}
if (spc::landing_buffer)
{
delete[] spc::landing_buffer;
spc::landing_buffer = NULL;
}
if (spc::shrink_buffer)
{
delete[] spc::shrink_buffer;
spc::shrink_buffer = NULL;
}
}
static inline int S9xAPUGetClock (int32 cpucycles)
{
return (spc::ratio_numerator * (cpucycles - spc::reference_time) + spc::remainder) /
spc::ratio_denominator;
}
static inline int S9xAPUGetClockRemainder (int32 cpucycles)
{
return (spc::ratio_numerator * (cpucycles - spc::reference_time) + spc::remainder) %
spc::ratio_denominator;
}
uint8 S9xAPUReadPort (int port)
{
return ((uint8) spc_core->read_port(S9xAPUGetClock(CPU.Cycles), port));
}
void S9xAPUWritePort (int port, uint8 byte)
{
spc_core->write_port(S9xAPUGetClock(CPU.Cycles), port, byte);
}
void S9xAPUSetReferenceTime (int32 cpucycles)
{
spc::reference_time = cpucycles;
}
void S9xAPUExecute (void)
{
/* Accumulate partial APU cycles */
spc_core->end_frame(S9xAPUGetClock(CPU.Cycles));
spc::remainder = S9xAPUGetClockRemainder(CPU.Cycles);
S9xAPUSetReferenceTime(CPU.Cycles);
}
void S9xAPUEndScanline (void)
{
S9xAPUExecute();
if (spc_core->sample_count() >= APU_MINIMUM_SAMPLE_BLOCK || !spc::sound_in_sync)
S9xLandSamples();
}
void S9xAPUTimingSetSpeedup (int ticks)
{
if (ticks != 0)
printf("APU speedup hack: %d\n", ticks);
spc::timing_hack_denominator = SNES_SPC::tempo_unit - ticks;
spc_core->set_tempo(spc::timing_hack_denominator);
spc::ratio_numerator = Settings.PAL ? APU_NUMERATOR_PAL : APU_NUMERATOR_NTSC;
spc::ratio_denominator = Settings.PAL ? APU_DENOMINATOR_PAL : APU_DENOMINATOR_NTSC;
spc::ratio_denominator = spc::ratio_denominator * spc::timing_hack_denominator / spc::timing_hack_numerator;
UpdatePlaybackRate();
}
void S9xResetAPU (void)
{
spc::reference_time = 0;
spc::remainder = 0;
spc_core->reset();
spc_core->set_output((SNES_SPC::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
spc::resampler->clear();
}
void S9xSoftResetAPU (void)
{
spc::reference_time = 0;
spc::remainder = 0;
spc_core->soft_reset();
spc_core->set_output((SNES_SPC::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
spc::resampler->clear();
}
static void from_apu_to_state (uint8 **buf, void *var, size_t size)
{
memcpy(*buf, var, size);
*buf += size;
}
static void to_apu_from_state (uint8 **buf, void *var, size_t size)
{
memcpy(var, *buf, size);
*buf += size;
}
void S9xAPUSaveState (uint8 *block)
{
uint8 *ptr = block;
spc_core->copy_state(&ptr, from_apu_to_state);
SET_LE32(ptr, spc::reference_time);
ptr += sizeof(int32);
SET_LE32(ptr, spc::remainder);
}
void S9xAPULoadState (uint8 *block)
{
uint8 *ptr = block;
S9xResetAPU();
spc_core->copy_state(&ptr, to_apu_from_state);
spc::reference_time = GET_LE32(ptr);
ptr += sizeof(int32);
spc::remainder = GET_LE32(ptr);
}
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