MCUME/MCUME_pico/piconofrendo/nes.h

/*
** 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.h
**
** NES hardware related definitions / prototypes
** $Id: nes.h,v 1.2 2001/04/27 14:37:11 neil Exp $
*/

#ifndef _NES_H_
#define _NES_H_

#include "noftypes.h"
#include "nes_apu.h"
#include "nes_mmc.h"
#include "nes_ppu.h"
#include "nes_rom.h"
#include "nes6502.h"
#include "bitmap.h"

/* Visible (NTSC) screen height */
#ifndef NES_VISIBLE_HEIGHT
#define  NES_VISIBLE_HEIGHT   224
#endif /* !NES_VISIBLE_HEIGHT */
#define  NES_SCREEN_WIDTH     256
#define  NES_SCREEN_HEIGHT    240

/* NTSC = 60Hz, PAL = 50Hz */
#ifdef PAL
#define  NES_REFRESH_RATE     50
#else /* !PAL */
#define  NES_REFRESH_RATE     60
#endif /* !PAL */

#define  MAX_MEM_HANDLERS     32

enum
{
   SOFT_RESET,
   HARD_RESET
};


typedef struct nes_s
{
   /* hardware things */
   nes6502_context *cpu;
   nes6502_memread readhandler[MAX_MEM_HANDLERS];
   nes6502_memwrite writehandler[MAX_MEM_HANDLERS];

   ppu_t *ppu;
   apu_t *apu;
   mmc_t *mmc;
   rominfo_t *rominfo;

   /* video buffer */
   /* For the ESP32, it costs too much memory to render to a separate buffer and blit that to the main buffer.
      Instead, the code has been modified to directly grab the primary buffer from the video subsystem and render
      there, saving us about 64K of memory. */
//   bitmap_t *vidbuf; 

   bool fiq_occurred;
   uint8 fiq_state;
   int fiq_cycles;

   int scanline;

   /* Timing stuff */
   float scanline_cycles;
   bool autoframeskip;

   /* control */
   bool poweroff;
   bool pause;

} nes_t;


extern int nes_isourfile(const char *filename);

/* temp hack */
extern nes_t *nes_getcontextptr(void);

/* Function prototypes */
extern void nes_getcontext(nes_t *machine);
extern void nes_setcontext(nes_t *machine);

extern nes_t *nes_create(void);
extern void nes_destroy(nes_t **machine);
extern int nes_insertcart(const char *filename, nes_t *machine);

extern void nes_setfiq(uint8 state);
extern void nes_nmi(void);
extern void nes_irq(void);
extern void nes_emulate(void);

extern void nes_reset(int reset_type);

extern void nes_poweroff(void);
extern void nes_togglepause(void);

#endif /* _NES_H_ */

/*
** $Log: nes.h,v $
** Revision 1.2  2001/04/27 14:37:11  neil
** wheeee
**
** Revision 1.1.1.1  2001/04/27 07:03:54  neil
** initial
**
** Revision 1.8  2000/11/26 15:51:13  matt
** frame IRQ emulation
**
** Revision 1.7  2000/11/25 20:30:39  matt
** scanline emulation simplifications/timing fixes
**
** Revision 1.6  2000/11/25 01:52:17  matt
** bool stinks sometimes
**
** Revision 1.5  2000/11/09 14:07:28  matt
** state load fixed, state save mostly fixed
**
** Revision 1.4  2000/10/29 14:36:45  matt
** nes_clearframeirq is static
**
** Revision 1.3  2000/10/25 01:23:08  matt
** basic system autodetection
**
** Revision 1.2  2000/10/25 00:23:16  matt
** makefiles updated for new directory structure
**
** Revision 1.1  2000/10/24 12:20:28  matt
** changed directory structure
**
** Revision 1.26  2000/10/23 17:51:10  matt
** adding fds support
**
** Revision 1.25  2000/10/23 15:53:08  matt
** better system handling
**
** Revision 1.24  2000/10/22 19:16:15  matt
** more sane timer ISR / autoframeskip
**
** Revision 1.23  2000/10/21 19:26:59  matt
** many more cleanups
**
** Revision 1.22  2000/10/10 13:58:15  matt
** stroustrup squeezing his way in the door
**
** Revision 1.21  2000/10/08 17:53:36  matt
** minor accuracy changes
**
** Revision 1.20  2000/09/15 04:58:07  matt
** simplifying and optimizing APU core
**
** Revision 1.19  2000/09/08 11:57:29  matt
** no more nes_fiq
**
** Revision 1.18  2000/08/11 02:43:50  matt
** moved frame irq stuff out of APU into here
**
** Revision 1.17  2000/07/31 04:27:59  matt
** one million cleanups
**
** Revision 1.16  2000/07/30 04:32:32  matt
** emulation of the NES frame IRQ
**
** Revision 1.15  2000/07/27 01:17:09  matt
** nes_insertrom -> nes_insertcart
**
** Revision 1.14  2000/07/26 21:36:16  neil
** Big honkin' change -- see the mailing list
**
** Revision 1.13  2000/07/25 02:25:53  matt
** safer xxx_destroy calls
**
** Revision 1.12  2000/07/23 15:13:13  matt
** autoframeskip is now a member variable of nes_t
**
** Revision 1.11  2000/07/17 05:12:55  matt
** nes_ppu.c is no longer a scary place to be-- cleaner & faster
**
** Revision 1.10  2000/07/17 01:52:28  matt
** made sure last line of all source files is a newline
**
** Revision 1.9  2000/07/16 09:48:58  neil
** Make visible height compile-time configurable in the Makefile
**
** Revision 1.8  2000/07/11 04:31:55  matt
** less magic number nastiness for screen dimensions
**
** Revision 1.7  2000/07/11 02:40:36  matt
** forgot to remove framecounter
**
** Revision 1.6  2000/07/11 02:38:25  matt
** encapsulated memory address handlers into nes/nsf
**
** Revision 1.5  2000/07/10 13:50:50  matt
** added function nes_irq()
**
** Revision 1.4  2000/06/09 15:12:26  matt
** initial revision
**
*/