Genesis-Plus-GX/source/system.h
2010-07-16 08:29:05 +00:00

95 lines
3.1 KiB
C

/***************************************************************************************
* Genesis Plus
* Main Emulation
*
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
* Eke-Eke (2007,2008,2009), additional code & fixes for the GCN/Wii port
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
****************************************************************************************/
#ifndef _SYSTEM_H_
#define _SYSTEM_H_
#define SYSTEM_GENESIS 0
#define SYSTEM_MEGADRIVE 1
#define SYSTEM_PICO 2
#define MCYCLES_PER_LINE 3420
typedef struct
{
uint8 *data; /* Bitmap data */
int width; /* Bitmap width (32+512+32) */
int height; /* Bitmap height (256) */
int depth; /* Color depth (8 bits) */
int pitch; /* Width of bitmap in bytes */
int granularity; /* Size of each pixel in bytes */
int remap; /* 1= Translate pixel data */
struct
{
int x; /* X offset of viewport within bitmap */
int y; /* Y offset of viewport within bitmap */
int w; /* Width of viewport */
int h; /* Height of viewport */
int ow; /* Previous width of viewport */
int oh; /* Previous height of viewport */
int changed; /* 1= Viewport width or height have changed */
} viewport;
} t_bitmap;
typedef struct
{
int sample_rate; /* Output Sample rate (8000-48000) */
float frame_rate; /* Output Frame rate (usually 50 or 60 frames per second) */
int enabled; /* 1= sound emulation is enabled */
int buffer_size; /* Size of sound buffer (in bytes) */
int16 *buffer[2]; /* Signed 16-bit stereo sound data */
struct
{
int32 *pos;
int32 *buffer;
} fm;
struct
{
int16 *pos;
int16 *buffer;
} psg;
} t_snd;
/* Global variables */
extern t_bitmap bitmap;
extern t_snd snd;
extern uint32 mcycles_vdp;
extern uint32 mcycles_z80;
extern uint32 mcycles_68k;
extern uint8 system_hw;
/* Function prototypes */
extern int audio_init(int samplerate,float framerate);
extern void audio_reset(void);
extern void audio_shutdown(void);
extern int audio_update(void);
extern void audio_set_equalizer(void);
extern void system_init(void);
extern void system_reset(void);
extern void system_shutdown(void);
extern void system_frame(int do_skip);
#endif /* _SYSTEM_H_ */