start hooking up blargg's apu implementation to use as a reference.

(not yet working)

1 files changed, 491 insertions, 0 deletions

diff --git a/source/apu_blargg.h b/source/apu_blargg.h
new file mode 100644
index 0000000..1760af2
--- /dev/null
+++ b/source/apu_blargg.h
@@ -0,0 +1,491 @@
+/***********************************************************************************
+  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.
+ ***********************************************************************************/
+
+#ifdef USE_BLARGG_APU
+
+#ifndef APU_BLARGG_H
+#define APU_BLARGG_H
+
+#include "snes9x.h"
+
+typedef void (*dsp_copy_func_t)( unsigned char** io, void* state, size_t );
+
+#define ECHO_HIST_SIZE		8
+#define ECHO_HIST_SIZE_X2	16
+
+/* Sound control */
+
+/* Mutes voices corresponding to non-zero bits in mask (issues repeated KOFF events).
+   Reduces emulation accuracy. */
+
+#define VOICE_COUNT		8
+#define EXTRA_SIZE		16
+#define EXTRA_SIZE_DIV_2	8
+#define BRR_BUF_SIZE		12
+#define BRR_BUF_SIZE_X2		24
+#define BRR_BLOCK_SIZE		9
+
+/* DSP register addresses */
+
+/* Global registers */
+
+#define R_MVOLL 0x0C
+#define R_MVOLR 0x1C
+#define R_EVOLL 0x2C
+#define R_EVOLR 0x3C
+#define R_KON	0x4C
+#define R_KOFF	0x5C
+#define R_FLG	0x6C
+#define R_ENDX	0x7C
+#define R_EFB	0x0D
+#define R_EON	0x4D
+#define R_PMON	0x2D
+#define R_NON	0x3D
+#define R_DIR	0x5D
+#define R_ESA	0x6D
+#define R_EDL	0x7D
+#define R_FIR	0x0F	/* 8 coefficients at 0x0F, 0x1F ... 0x7F */
+
+/* Voice registers */
+#define V_VOLL		0x00
+#define V_VOLR		0x01
+#define V_PITCHL	0x02
+#define V_PITCHH	0x03
+#define V_SRCN		0x04
+#define V_ADSR0		0x05
+#define V_ADSR1		0x06
+#define V_GAIN		0x07
+#define V_ENVX		0x08
+#define V_OUTX		0x09
+
+/* Status flag handling */
+
+/* Hex value in name to clarify code and bit shifting.
+   Flag stored in indicated variable during emulation */
+
+#define N80 0x80	/* nz */
+#define V40 0x40	/* psw */
+#define P20 0x20	/* dp */
+#define B10 0x10	/* psw */
+#define H08 0x08	/* psw */
+#define I04 0x04	/* psw */
+#define Z02 0x02	/* nz */
+#define C01 0x01	/* c */
+
+#define NZ_NEG_MASK 0x880	/* either bit set indicates N flag set */
+
+#define REGISTER_COUNT 128
+
+#define ENV_RELEASE	0
+#define ENV_ATTACK	1
+#define ENV_DECAY	2
+#define ENV_SUSTAIN	3
+
+typedef struct
+{
+   /* decoded samples (twice the size to simplify wrap handling) */
+   int buf [BRR_BUF_SIZE_X2];
+   /* place in buffer where next samples will be decoded */
+   int buf_pos;
+   /* relative fractional position in sample (0x1000 = 1.0) */
+   int interp_pos;
+   /* address of current BRR block */
+   int brr_addr;
+   /* current decoding offset in BRR block */
+   int brr_offset;
+   /* pointer to voice's DSP registers */
+   uint8_t* regs;
+   /* bitmask for voice: 0x01 for voice 0, 0x02 for voice 1, etc. */
+   int vbit;
+   /* KON delay/current setup phase */
+   int kon_delay;
+   int env_mode;
+   /* current envelope level */
+   int env;
+   /* used by GAIN mode 7, very obscure quirk */
+   int hidden_env;
+   uint8_t t_envx_out;
+} dsp_voice_t;
+
+typedef struct
+{
+   uint8_t regs [REGISTER_COUNT];
+
+   /* Echo history keeps most recent 8 samples
+           (twice the size to simplify wrap handling) */
+
+   int echo_hist [ECHO_HIST_SIZE_X2] [2];
+
+   int (*echo_hist_pos) [2]; /* &echo_hist [0 to 7] */
+
+   int every_other_sample; /* toggles every sample */
+   int kon;                /* KON value when last checked */
+   int noise;
+   int counter;
+   int echo_offset;        /* offset from ESA in echo buffer */
+   int echo_length;        /* number of bytes that echo_offset will stop at */
+   int phase;              /* next clock cycle to run (0-31) */
+
+   /* Hidden registers also written to when main register is written to */
+   int new_kon;
+   uint8_t endx_buf;
+   uint8_t envx_buf;
+   uint8_t outx_buf;
+
+   /* Temporary state between clocks */
+
+   /* read once per sample */
+   int t_pmon;
+   int t_non;
+   int t_eon;
+   int t_dir;
+   int t_koff;
+
+   /* read a few clocks ahead then used */
+   int t_brr_next_addr;
+   int t_adsr0;
+   int t_brr_header;
+   int t_brr_byte;
+   int t_srcn;
+   int t_esa;
+   int t_echo_enabled;
+
+   /* internal state that is recalculated every sample */
+   int t_dir_addr;
+   int t_pitch;
+   int t_output;
+   int t_looped;
+   int t_echo_ptr;
+
+   /* left/right sums */
+   int t_main_out [2];
+   int t_echo_out [2];
+   int t_echo_in  [2];
+
+   dsp_voice_t voices [VOICE_COUNT];
+
+   /* non-emulation state */
+   uint8_t* ram; /* 64K shared RAM between DSP and SMP */
+   short* out;
+   short* out_end;
+   short* out_begin;
+   short extra [EXTRA_SIZE];
+
+   int rom_enabled;
+   uint8_t *rom, *hi_ram;
+} dsp_state_t;
+
+#if !SPC_NO_COPY_STATE_FUNCS
+
+typedef struct {
+   dsp_copy_func_t func;
+   unsigned char** buf;
+} spc_state_copy_t;
+
+#define SPC_COPY( type, state ) state = (type) spc_copier_copy_int(&copier, state, sizeof (type) );
+
+#endif
+
+#define REG_COUNT	0x10
+#define PORT_COUNT	4
+#define TEMPO_UNIT	0x100
+#define STATE_SIZE	68 * 1024L /* maximum space needed when saving */
+#define TIMER_COUNT	3
+#define ROM_SIZE	0x40
+#define ROM_ADDR	0xFFC0
+
+/* 1024000 SPC clocks per second, sample pair every 32 clocks */
+#define CLOCKS_PER_SAMPLE 32
+
+#define R_TEST		0x0
+#define R_CONTROL	0x1
+#define R_DSPADDR	0x2
+#define R_DSPDATA	0x3
+#define R_CPUIO0	0x4
+#define R_CPUIO1	0x5
+#define R_CPUIO2	0x6
+#define R_CPUIO3	0x7
+#define R_F8		0x8
+#define R_F9		0x9
+#define R_T0TARGET	0xA
+#define R_T1TARGET	0xB
+#define R_T2TARGET	0xC
+#define R_T0OUT		0xD
+#define R_T1OUT		0xE
+#define R_T2OUT		0xF
+
+/* Value that padding should be filled with */
+#define CPU_PAD_FILL 0xFF
+
+#if !SPC_NO_COPY_STATE_FUNCS
+   /* Saves/loads state */
+   void spc_copy_state( unsigned char** io, dsp_copy_func_t );
+#endif
+
+/* rel_time_t - Time relative to m_spc_time. Speeds up code a bit by eliminating
+   need to constantly add m_spc_time to time from CPU. CPU uses time that ends
+   at 0 to eliminate reloading end time every instruction. It pays off. */
+
+typedef struct
+{
+   int next_time; /* time of next event */
+   int prescaler;
+   int period;
+   int divider;
+   int enabled;
+   int counter;
+} Timer;
+
+/* Support SNES_MEMORY_APURAM */
+uint8_t *spc_apuram (void);
+
+typedef struct
+{
+   Timer timers [TIMER_COUNT];
+
+   uint8_t smp_regs [2] [REG_COUNT];
+
+   struct
+   {
+      int pc;
+      int a;
+      int x;
+      int y;
+      int psw;
+      int sp;
+   } cpu_regs;
+
+   int  dsp_time;
+   int  spc_time;
+
+   int         tempo;
+
+   int         extra_clocks;
+   short*   buf_begin;
+   short*	buf_end;
+   short*   extra_pos;
+   short    extra_buf [EXTRA_SIZE];
+
+   int         rom_enabled;
+   uint8_t     rom    [ROM_SIZE];
+   uint8_t     hi_ram [ROM_SIZE];
+
+   unsigned char cycle_table [256];
+
+   struct
+   {
+      /* padding to neutralize address overflow */
+      union {
+         uint8_t padding1 [0x100];
+         uint16_t align; /* makes compiler align data for 16-bit access */
+      } padding1 [1];
+      uint8_t ram      [0x10000];
+      uint8_t padding2 [0x100];
+   } ram;
+} spc_state_t;
+
+/* Number of samples written to output since last set */
+#define SPC_SAMPLE_COUNT() ((m.extra_clocks >> 5) * 2)
+
+typedef void (*apu_callback)(void);
+
+#define SPC_SAVE_STATE_BLOCK_SIZE	(STATE_SIZE + 8)
+
+bool8 S9xInitAPU (void);
+void S9xDeinitAPU (void);
+void S9xResetAPU (void);
+void S9xSoftResetAPU (void);
+uint8 S9xAPUReadPort (int port);
+void S9xAPUWritePort (int port, uint8 byte);
+void S9xAPUExecute (void);
+void S9xAPUSetReferenceTime (int32 cpucycles);
+void S9xAPUTimingSetSpeedup (int ticks);
+void S9xAPUAllowTimeOverflow (bool8 allow);
+void S9xAPULoadState (uint8 * block);
+void S9xAPUSaveState (uint8 * block);
+
+bool8 S9xInitSound (int buffer_ms, int lag_ms);
+
+bool8 S9xSyncSound (void);
+int S9xGetSampleCount (void);
+void S9xFinalizeSamples (void);
+void S9xClearSamples (void);
+bool8 S9xMixSamples (short * buffer, unsigned sample_count);
+void S9xSetSamplesAvailableCallback (apu_callback);
+
+#endif // APU_BLARGG_H
+
+#endif