mirror of
https://github.com/libretro/snes9x.git
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664 lines
17 KiB
C++
664 lines
17 KiB
C++
/***********************************************************************************
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com),
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Jerremy Koot (jkoot@snes9x.com)
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(c) Copyright 2002 - 2004 Matthew Kendora
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(c) Copyright 2002 - 2005 Peter Bortas (peter@bortas.org)
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(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
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(c) Copyright 2001 - 2006 John Weidman (jweidman@slip.net)
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(c) Copyright 2002 - 2006 funkyass (funkyass@spam.shaw.ca),
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Kris Bleakley (codeviolation@hotmail.com)
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(c) Copyright 2002 - 2010 Brad Jorsch (anomie@users.sourceforge.net),
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Nach (n-a-c-h@users.sourceforge.net),
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(c) Copyright 2002 - 2011 zones (kasumitokoduck@yahoo.com)
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(c) Copyright 2006 - 2007 nitsuja
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(c) Copyright 2009 - 2011 BearOso,
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OV2
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BS-X C emulator code
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(c) Copyright 2005 - 2006 Dreamer Nom,
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zones
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C4 x86 assembler and some C emulation code
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(c) Copyright 2000 - 2003 _Demo_ (_demo_@zsnes.com),
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Nach,
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zsKnight (zsknight@zsnes.com)
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C4 C++ code
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(c) Copyright 2003 - 2006 Brad Jorsch,
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Nach
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DSP-1 emulator code
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(c) Copyright 1998 - 2006 _Demo_,
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Andreas Naive (andreasnaive@gmail.com),
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Gary Henderson,
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Ivar (ivar@snes9x.com),
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John Weidman,
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Kris Bleakley,
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Matthew Kendora,
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Nach,
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neviksti (neviksti@hotmail.com)
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DSP-2 emulator code
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(c) Copyright 2003 John Weidman,
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Kris Bleakley,
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Lord Nightmare (lord_nightmare@users.sourceforge.net),
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Matthew Kendora,
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neviksti
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DSP-3 emulator code
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(c) Copyright 2003 - 2006 John Weidman,
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Kris Bleakley,
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Lancer,
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z80 gaiden
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DSP-4 emulator code
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(c) Copyright 2004 - 2006 Dreamer Nom,
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John Weidman,
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Kris Bleakley,
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Nach,
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z80 gaiden
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OBC1 emulator code
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(c) Copyright 2001 - 2004 zsKnight,
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pagefault (pagefault@zsnes.com),
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Kris Bleakley
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Ported from x86 assembler to C by sanmaiwashi
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SPC7110 and RTC C++ emulator code used in 1.39-1.51
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(c) Copyright 2002 Matthew Kendora with research by
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zsKnight,
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John Weidman,
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Dark Force
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SPC7110 and RTC C++ emulator code used in 1.52+
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(c) Copyright 2009 byuu,
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neviksti
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S-DD1 C emulator code
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(c) Copyright 2003 Brad Jorsch with research by
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Andreas Naive,
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John Weidman
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S-RTC C emulator code
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(c) Copyright 2001 - 2006 byuu,
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John Weidman
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ST010 C++ emulator code
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(c) Copyright 2003 Feather,
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John Weidman,
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Kris Bleakley,
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Matthew Kendora
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Super FX x86 assembler emulator code
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(c) Copyright 1998 - 2003 _Demo_,
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pagefault,
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zsKnight
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Super FX C emulator code
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(c) Copyright 1997 - 1999 Ivar,
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Gary Henderson,
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John Weidman
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Sound emulator code used in 1.5-1.51
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(c) Copyright 1998 - 2003 Brad Martin
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(c) Copyright 1998 - 2006 Charles Bilyue'
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Sound emulator code used in 1.52+
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(c) Copyright 2004 - 2007 Shay Green (gblargg@gmail.com)
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SH assembler code partly based on x86 assembler code
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(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
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2xSaI filter
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(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
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HQ2x, HQ3x, HQ4x filters
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(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
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NTSC filter
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(c) Copyright 2006 - 2007 Shay Green
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GTK+ GUI code
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(c) Copyright 2004 - 2011 BearOso
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Win32 GUI code
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(c) Copyright 2003 - 2006 blip,
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funkyass,
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Matthew Kendora,
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Nach,
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nitsuja
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(c) Copyright 2009 - 2011 OV2
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Mac OS GUI code
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(c) Copyright 1998 - 2001 John Stiles
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(c) Copyright 2001 - 2011 zones
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Specific ports contains the works of other authors. See headers in
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individual files.
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Snes9x homepage: http://www.snes9x.com/
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Permission to use, copy, modify and/or distribute Snes9x in both binary
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and source form, for non-commercial purposes, is hereby granted without
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fee, providing that this license information and copyright notice appear
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with all copies and any derived work.
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This software is provided 'as-is', without any express or implied
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warranty. In no event shall the authors be held liable for any damages
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arising from the use of this software or it's derivatives.
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Snes9x is freeware for PERSONAL USE only. Commercial users should
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seek permission of the copyright holders first. Commercial use includes,
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but is not limited to, charging money for Snes9x or software derived from
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Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
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using Snes9x as a promotion for your commercial product.
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The copyright holders request that bug fixes and improvements to the code
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should be forwarded to them so everyone can benefit from the modifications
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in future versions.
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Super NES and Super Nintendo Entertainment System are trademarks of
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Nintendo Co., Limited and its subsidiary companies.
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***********************************************************************************/
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#include <math.h>
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#include "snes9x.h"
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#include "apu.h"
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#include "snapshot.h"
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#include "display.h"
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#include "hermite_resampler.h"
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#include "snes/snes.hpp"
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#define APU_DEFAULT_INPUT_RATE 32000
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#define APU_MINIMUM_SAMPLE_COUNT 512
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#define APU_MINIMUM_SAMPLE_BLOCK 128
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#define APU_NUMERATOR_NTSC 15664
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#define APU_DENOMINATOR_NTSC 328125
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#define APU_NUMERATOR_PAL 34176
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#define APU_DENOMINATOR_PAL 709379
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namespace SNES
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{
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#include "dsp/blargg_endian.h"
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CPU cpu;
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}
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namespace spc
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{
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static apu_callback sa_callback = NULL;
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static void *extra_data = NULL;
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static bool8 sound_in_sync = TRUE;
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static bool8 sound_enabled = FALSE;
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static int buffer_size;
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static int lag_master = 0;
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static int lag = 0;
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static uint8 *landing_buffer = NULL;
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static uint8 *shrink_buffer = NULL;
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static Resampler *resampler = NULL;
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static int32 reference_time;
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static uint32 remainder;
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static const int timing_hack_numerator = 256;
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static int timing_hack_denominator = 256;
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/* Set these to NTSC for now. Will change to PAL in S9xAPUTimingSetSpeedup
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if necessary on game load. */
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static uint32 ratio_numerator = APU_NUMERATOR_NTSC;
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static uint32 ratio_denominator = APU_DENOMINATOR_NTSC;
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}
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static void EightBitize (uint8 *, int);
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static void DeStereo (uint8 *, int);
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static void ReverseStereo (uint8 *, int);
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static void UpdatePlaybackRate (void);
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static void SPCSnapshotCallback (void);
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static inline int S9xAPUGetClock (int32);
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static inline int S9xAPUGetClockRemainder (int32);
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static void EightBitize (uint8 *buffer, int sample_count)
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{
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uint8 *buf8 = (uint8 *) buffer;
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int16 *buf16 = (int16 *) buffer;
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for (int i = 0; i < sample_count; i++)
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buf8[i] = (uint8) ((buf16[i] / 256) + 128);
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}
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static void DeStereo (uint8 *buffer, int sample_count)
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{
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int16 *buf = (int16 *) buffer;
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int32 s1, s2;
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for (int i = 0; i < sample_count >> 1; i++)
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{
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s1 = (int32) buf[2 * i];
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s2 = (int32) buf[2 * i + 1];
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buf[i] = (int16) ((s1 + s2) >> 1);
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}
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}
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static void ReverseStereo (uint8 *src_buffer, int sample_count)
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{
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int16 *buffer = (int16 *) src_buffer;
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for (int i = 0; i < sample_count; i += 2)
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{
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buffer[i + 1] ^= buffer[i];
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buffer[i] ^= buffer[i + 1];
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buffer[i + 1] ^= buffer[i];
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}
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}
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bool8 S9xMixSamples (uint8 *buffer, int sample_count)
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{
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static int shrink_buffer_size = -1;
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uint8 *dest;
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if (!Settings.SixteenBitSound || !Settings.Stereo)
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{
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/* We still need both stereo samples for generating the mono sample */
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if (!Settings.Stereo)
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sample_count <<= 1;
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/* We still have to generate 16-bit samples for bit-dropping, too */
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if (shrink_buffer_size < (sample_count << 1))
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{
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delete[] spc::shrink_buffer;
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spc::shrink_buffer = new uint8[sample_count << 1];
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shrink_buffer_size = sample_count << 1;
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}
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dest = spc::shrink_buffer;
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}
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else
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dest = buffer;
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if (Settings.Mute)
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{
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memset(dest, 0, sample_count << 1);
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spc::resampler->clear();
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return (FALSE);
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}
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else
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{
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if (spc::resampler->avail() >= (sample_count + spc::lag))
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{
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spc::resampler->read((short *) dest, sample_count);
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if (spc::lag == spc::lag_master)
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spc::lag = 0;
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}
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else
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{
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memset(buffer, (Settings.SixteenBitSound ? 0 : 128), (sample_count << (Settings.SixteenBitSound ? 1 : 0)) >> (Settings.Stereo ? 0 : 1));
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if (spc::lag == 0)
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spc::lag = spc::lag_master;
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return (FALSE);
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}
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}
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if (Settings.ReverseStereo && Settings.Stereo)
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ReverseStereo(dest, sample_count);
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if (!Settings.Stereo || !Settings.SixteenBitSound)
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{
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if (!Settings.Stereo)
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{
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DeStereo(dest, sample_count);
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sample_count >>= 1;
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}
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if (!Settings.SixteenBitSound)
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EightBitize(dest, sample_count);
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memcpy(buffer, dest, (sample_count << (Settings.SixteenBitSound ? 1 : 0)));
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}
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return (TRUE);
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}
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int S9xGetSampleCount (void)
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{
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return (spc::resampler->avail() >> (Settings.Stereo ? 0 : 1));
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}
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/* TODO: Attach */
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void S9xFinalizeSamples (void)
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{
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if (!Settings.Mute)
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{
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if (!spc::resampler->push((short *) spc::landing_buffer, SNES::dsp.spc_dsp.sample_count ()))
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{
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/* We weren't able to process the entire buffer. Potential overrun. */
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spc::sound_in_sync = FALSE;
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if (Settings.SoundSync && !Settings.TurboMode)
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return;
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}
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}
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if (!Settings.SoundSync || Settings.TurboMode || Settings.Mute)
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spc::sound_in_sync = TRUE;
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else
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if (spc::resampler->space_empty() >= spc::resampler->space_filled())
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spc::sound_in_sync = TRUE;
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else
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spc::sound_in_sync = FALSE;
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SNES::dsp.spc_dsp.set_output((SNES::SPC_DSP::sample_t *) spc::landing_buffer, spc::buffer_size);
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}
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void S9xLandSamples (void)
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{
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if (spc::sa_callback != NULL)
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spc::sa_callback(spc::extra_data);
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else
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S9xFinalizeSamples();
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}
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void S9xClearSamples (void)
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{
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spc::resampler->clear();
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spc::lag = spc::lag_master;
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}
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bool8 S9xSyncSound (void)
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{
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if (!Settings.SoundSync || spc::sound_in_sync)
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return (TRUE);
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S9xLandSamples();
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return (spc::sound_in_sync);
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}
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void S9xSetSamplesAvailableCallback (apu_callback callback, void *data)
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{
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spc::sa_callback = callback;
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spc::extra_data = data;
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}
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static void UpdatePlaybackRate (void)
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{
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if (Settings.SoundInputRate == 0)
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Settings.SoundInputRate = APU_DEFAULT_INPUT_RATE;
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double time_ratio = (double) Settings.SoundInputRate * spc::timing_hack_numerator / (Settings.SoundPlaybackRate * spc::timing_hack_denominator);
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spc::resampler->time_ratio(time_ratio);
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}
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bool8 S9xInitSound (int buffer_ms, int lag_ms)
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{
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// buffer_ms : buffer size given in millisecond
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// lag_ms : allowable time-lag given in millisecond
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int sample_count = buffer_ms * 32000 / 1000;
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int lag_sample_count = lag_ms * 32000 / 1000;
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spc::lag_master = lag_sample_count;
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if (Settings.Stereo)
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spc::lag_master <<= 1;
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spc::lag = spc::lag_master;
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if (sample_count < APU_MINIMUM_SAMPLE_COUNT)
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sample_count = APU_MINIMUM_SAMPLE_COUNT;
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spc::buffer_size = sample_count;
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if (Settings.Stereo)
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spc::buffer_size <<= 1;
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if (Settings.SixteenBitSound)
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spc::buffer_size <<= 1;
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printf("Sound buffer size: %d (%d samples)\n", spc::buffer_size, sample_count);
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if (spc::landing_buffer)
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delete[] spc::landing_buffer;
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spc::landing_buffer = new uint8[spc::buffer_size * 2];
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if (!spc::landing_buffer)
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return (FALSE);
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/* The resampler and spc unit use samples (16-bit short) as
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arguments. Use 2x in the resampler for buffer leveling with SoundSync */
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if (!spc::resampler)
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{
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spc::resampler = new HermiteResampler(spc::buffer_size >> (Settings.SoundSync ? 0 : 1));
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if (!spc::resampler)
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{
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delete[] spc::landing_buffer;
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return (FALSE);
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}
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}
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else
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spc::resampler->resize(spc::buffer_size >> (Settings.SoundSync ? 0 : 1));
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SNES::dsp.spc_dsp.set_output ((SNES::SPC_DSP::sample_t *) spc::landing_buffer, spc::buffer_size);
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UpdatePlaybackRate();
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spc::sound_enabled = S9xOpenSoundDevice();
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return (spc::sound_enabled);
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}
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void S9xSetSoundControl (uint8 voice_switch)
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{
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SNES::dsp.spc_dsp.set_stereo_switch (voice_switch << 8 | voice_switch);
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}
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void S9xSetSoundMute (bool8 mute)
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{
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Settings.Mute = mute;
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if (!spc::sound_enabled)
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Settings.Mute = TRUE;
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}
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void S9xDumpSPCSnapshot (void)
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{
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SNES::dsp.spc_dsp.dump_spc_snapshot();
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}
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static void SPCSnapshotCallback (void)
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{
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S9xSPCDump(S9xGetFilenameInc((".spc"), SPC_DIR));
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printf("Dumped key-on triggered spc snapshot.\n");
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}
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bool8 S9xInitAPU (void)
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{
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spc::landing_buffer = NULL;
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spc::shrink_buffer = NULL;
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spc::resampler = NULL;
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return (TRUE);
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}
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void S9xDeinitAPU (void)
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{
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if (spc::resampler)
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{
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delete spc::resampler;
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spc::resampler = NULL;
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}
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if (spc::landing_buffer)
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{
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delete[] spc::landing_buffer;
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spc::landing_buffer = NULL;
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}
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if (spc::shrink_buffer)
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{
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delete[] spc::shrink_buffer;
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spc::shrink_buffer = NULL;
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}
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}
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static inline int S9xAPUGetClock (int32 cpucycles)
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{
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return (spc::ratio_numerator * (cpucycles - spc::reference_time) + spc::remainder) /
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spc::ratio_denominator;
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}
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static inline int S9xAPUGetClockRemainder (int32 cpucycles)
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{
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return (spc::ratio_numerator * (cpucycles - spc::reference_time) + spc::remainder) %
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spc::ratio_denominator;
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}
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uint8 S9xAPUReadPort (int port)
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{
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S9xAPUExecute ();
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return ((uint8) SNES::smp.port_read (port & 3));
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}
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void S9xAPUWritePort (int port, uint8 byte)
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{
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S9xAPUExecute ();
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SNES::cpu.port_write (port & 3, byte);
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}
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void S9xAPUSetReferenceTime (int32 cpucycles)
|
|
{
|
|
spc::reference_time = cpucycles;
|
|
}
|
|
|
|
void S9xAPUExecute (void)
|
|
{
|
|
SNES::smp.clock -= S9xAPUGetClock (CPU.Cycles);
|
|
SNES::smp.enter ();
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|
|
|
spc::remainder = S9xAPUGetClockRemainder(CPU.Cycles);
|
|
|
|
S9xAPUSetReferenceTime(CPU.Cycles);
|
|
}
|
|
|
|
void S9xAPUEndScanline (void)
|
|
{
|
|
S9xAPUExecute();
|
|
SNES::dsp.synchronize();
|
|
|
|
if (SNES::dsp.spc_dsp.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 = 256 - ticks;
|
|
|
|
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;
|
|
|
|
SNES::cpu.reset ();
|
|
SNES::cpu.frequency = Settings.PAL ? PAL_MASTER_CLOCK : NTSC_MASTER_CLOCK;
|
|
SNES::smp.power ();
|
|
SNES::dsp.power ();
|
|
SNES::dsp.spc_dsp.set_output ((SNES::SPC_DSP::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
|
|
SNES::dsp.spc_dsp.set_spc_snapshot_callback(SPCSnapshotCallback);
|
|
|
|
spc::resampler->clear();
|
|
}
|
|
|
|
void S9xSoftResetAPU (void)
|
|
{
|
|
spc::reference_time = 0;
|
|
spc::remainder = 0;
|
|
SNES::cpu.reset ();
|
|
SNES::smp.reset ();
|
|
SNES::dsp.reset ();
|
|
SNES::dsp.spc_dsp.set_output ((SNES::SPC_DSP::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
|
|
|
|
spc::resampler->clear();
|
|
}
|
|
|
|
void S9xAPUSaveState (uint8 *block)
|
|
{
|
|
uint8 *ptr = block;
|
|
|
|
SNES::smp.save_state (&ptr);
|
|
SNES::dsp.save_state (&ptr);
|
|
|
|
SNES::set_le32(ptr, spc::reference_time);
|
|
ptr += sizeof(int32);
|
|
SNES::set_le32(ptr, spc::remainder);
|
|
ptr += sizeof(int32);
|
|
SNES::set_le32(ptr, SNES::dsp.clock);
|
|
ptr += sizeof(int32);
|
|
memcpy (ptr, SNES::cpu.registers, 4);
|
|
}
|
|
|
|
void S9xAPULoadState (uint8 *block)
|
|
{
|
|
uint8 *ptr = block;
|
|
|
|
S9xResetAPU();
|
|
|
|
SNES::smp.load_state (&ptr);
|
|
SNES::dsp.load_state (&ptr);
|
|
|
|
spc::reference_time = SNES::get_le32(ptr);
|
|
ptr += sizeof(int32);
|
|
spc::remainder = SNES::get_le32(ptr);
|
|
ptr += sizeof(int32);
|
|
SNES::dsp.clock = SNES::get_le32(ptr);
|
|
ptr += sizeof(int32);
|
|
memcpy (SNES::cpu.registers, ptr, 4);
|
|
}
|
|
|
|
bool8 S9xSPCDump (const char *filename)
|
|
{
|
|
FILE *fs;
|
|
uint8 buf[SPC_FILE_SIZE];
|
|
size_t ignore;
|
|
|
|
fs = fopen(filename, "wb");
|
|
if (!fs)
|
|
return (FALSE);
|
|
|
|
S9xSetSoundMute(TRUE);
|
|
|
|
SNES::smp.save_spc (buf);
|
|
|
|
ignore = fwrite(buf, SPC_FILE_SIZE, 1, fs);
|
|
|
|
fclose(fs);
|
|
|
|
S9xSetSoundMute(FALSE);
|
|
|
|
return (TRUE);
|
|
}
|