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/*
** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
**
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of version 2 of the GNU Library General
** Public License as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Library General Public License for more details. To obtain a
** copy of the GNU Library General Public License, write to the Free
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** Any permitted reproduction of these routines, in whole or in part,
** must bear this legend.
**
**
** nes_apu.h
**
** NES APU emulation header file
** $Id: nes_apu.h,v 1.2 2003/01/09 19:50:03 jkeil Exp $
*/
#ifndef _NES_APU_H_
#define _NES_APU_H_
#ifdef __GNUC__
#define INLINE static inline
#elif defined(WIN32)
#define INLINE static __inline
#else
#define INLINE static
#endif
/* define this for realtime generated noise */
#define REALTIME_NOISE
#define APU_WRA0 0x4000
#define APU_WRA1 0x4001
#define APU_WRA2 0x4002
#define APU_WRA3 0x4003
#define APU_WRB0 0x4004
#define APU_WRB1 0x4005
#define APU_WRB2 0x4006
#define APU_WRB3 0x4007
#define APU_WRC0 0x4008
#define APU_WRC2 0x400A
#define APU_WRC3 0x400B
#define APU_WRD0 0x400C
#define APU_WRD2 0x400E
#define APU_WRD3 0x400F
#define APU_WRE0 0x4010
#define APU_WRE1 0x4011
#define APU_WRE2 0x4012
#define APU_WRE3 0x4013
#define APU_OAMDMA 0x4014
#define APU_SMASK 0x4015
#define APU_JOY0 0x4016
#define APU_JOY1 0x4017
/* length of generated noise */
#define APU_NOISE_32K 0x7FFF
#define APU_NOISE_93 93
#define APU_BASEFREQ (NES_MASTER_CLOCK / 12)
/* to/from 16.16 fixed point */
#define APU_TO_FIXED(x) ((x) << 16)
#define APU_FROM_FIXED(x) ((x) >> 16)
/* channel structures */
/* As much data as possible is precalculated,
** to keep the sample processing as lean as possible
*/
typedef struct rectangle_s
{
uint8 regs[4];
boolean enabled;
int32 phaseacc;
int32 freq;
int32 output_vol;
boolean fixed_envelope;
boolean holdnote;
uint8 volume;
int32 sweep_phase;
int32 sweep_delay;
boolean sweep_on;
uint8 sweep_shifts;
uint8 sweep_length;
boolean sweep_inc;
int32 freq_limit;
int32 env_phase;
int32 env_delay;
uint8 env_vol;
int vbl_length;
uint8 adder;
int duty_flip;
} rectangle_t;
/*
enum
{
COUNTMODE_LOAD,
COUNTMODE_COUNT
};
*/
typedef struct triangle_s
{
uint8 regs[3];
boolean enabled;
int32 freq;
int32 phaseacc;
int32 output_vol;
uint8 adder;
boolean holdnote;
boolean counter_started;
/* quasi-hack */
int write_latency;
// boolean countmode;
int vbl_length;
int linear_length;
} triangle_t;
typedef struct noise_s
{
uint8 regs[3];
boolean enabled;
int32 freq;
int32 phaseacc;
int32 output_vol;
int32 env_phase;
int32 env_delay;
uint8 env_vol;
boolean fixed_envelope;
boolean holdnote;
uint8 volume;
int vbl_length;
#ifdef REALTIME_NOISE
uint8 xor_tap;
#else
boolean short_sample;
int cur_pos;
#endif /* REALTIME_NOISE */
} noise_t;
typedef struct dmc_s
{
uint8 regs[4];
/* bodge for timestamp queue */
boolean enabled;
int32 freq;
int32 phaseacc;
int32 output_vol;
uint32 address;
uint32 cached_addr;
int dma_length;
int cached_dmalength;
uint8 cur_byte;
boolean looping;
boolean irq_gen;
boolean irq_occurred;
} dmc_t;
enum
{
APU_FILTER_NONE,
APU_FILTER_LOWPASS,
APU_FILTER_WEIGHTED
};
typedef struct
{
uint32 min_range, max_range;
uint8 (*read_func)(uint32 address);
} apu_memread;
typedef struct
{
uint32 min_range, max_range;
void (*write_func)(uint32 address, uint8 value);
} apu_memwrite;
/* external sound chip stuff */
typedef struct apuext_s
{
void (*init)(void);
void (*shutdown)(void);
void (*reset)(void);
int32 (*process)(void);
apu_memread *mem_read;
apu_memwrite *mem_write;
} apuext_t;
/* APU queue structure */
#define APUQUEUE_SIZE 4096
#define APUQUEUE_MASK (APUQUEUE_SIZE - 1)
/* apu ring buffer member */
typedef struct apudata_s
{
uint32 timestamp, address;
uint8 value;
} apudata_t;
typedef struct apu_s
{
rectangle_t rectangle[2];
triangle_t triangle;
noise_t noise;
dmc_t dmc;
uint8 enable_reg;
apudata_t queue[APUQUEUE_SIZE];
int q_head, q_tail;
uint32 elapsed_cycles;
void *buffer; /* pointer to output buffer */
int num_samples;
int mix_enable; /* $$$ben : should improve emulation */
int filter_type;
int32 cycle_rate;
int sample_rate;
int sample_bits;
int refresh_rate;
void (*process)(void *buffer, int num_samples);
/* $$$ ben : last error string */
const char * errstr;
/* external sound chip */
apuext_t *ext;
} apu_t;
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* Function prototypes */
extern apu_t *apu_create(int sample_rate, int refresh_rate, int sample_bits, boolean stereo);
extern void apu_destroy(apu_t *apu);
extern int apu_setext(apu_t *apu, apuext_t *ext);
extern int apu_setfilter(int filter_type);
extern void apu_process(void *buffer, int num_samples);
extern void apu_reset(void);
extern int apu_setchan(int chan, boolean enabled);
extern int32 apu_getcyclerate(void);
extern apu_t *apu_getcontext(void);
extern uint8 apu_read(uint32 address);
extern void apu_write(uint32 address, uint8 value);
/* for visualization */
extern void apu_getpcmdata(void **data, int *num_samples, int *sample_bits);
extern void apu_setcontext(apu_t *src_apu);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _NES_APU_H_ */
/*
** $Log: nes_apu.h,v $
** Revision 1.2 2003/01/09 19:50:03 jkeil
** NSF audio files were crashing on SPARC.
**
** - Define the correct HOST_ENDIAN for SPARC
** - remove unaligned memory accesses
**
** Revision 1.1 2003/01/08 07:04:35 tmmm
** initial import of Nosefart sources
**
** Revision 1.12 2000/07/04 04:54:48 matt
** minor changes that helped with MAME
**
** Revision 1.11 2000/07/03 02:18:53 matt
** much better external module exporting
**
** Revision 1.10 2000/06/26 05:00:37 matt
** cleanups
**
** Revision 1.9 2000/06/23 03:29:28 matt
** cleaned up external sound inteface
**
** Revision 1.8 2000/06/20 04:06:16 matt
** migrated external sound definition to apu module
**
** Revision 1.7 2000/06/20 00:07:35 matt
** added convenience members to apu_t struct
**
** Revision 1.6 2000/06/09 16:49:02 matt
** removed all floating point from sound generation
**
** Revision 1.5 2000/06/09 15:12:28 matt
** initial revision
**
*/

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