mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/***************************************************************************************
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* Genesis Plus
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* Virtual System Emulation
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*
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
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* Eke-Eke (2007-2011), additional code & fixes for the GCN/Wii port
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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****************************************************************************************/
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#ifndef _SYSTEM_H_
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#define _SYSTEM_H_
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#define SYSTEM_PBC 0x00
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#define SYSTEM_GENESIS 0x01
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#define SYSTEM_MEGADRIVE 0x02
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#define SYSTEM_PICO 0x03
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#define MCYCLES_PER_LINE 3420
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#define Z80_CYCLE_OFFSET 550 /* horizontal timings offset when running in SMS mode */
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typedef struct
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{
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uint8 *data; /* Bitmap data */
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int width; /* Bitmap width */
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int height; /* Bitmap height */
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int depth; /* Color depth (8-32 bits) */
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int pitch; /* Width of bitmap in bytes */
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int granularity; /* Size of each pixel in bytes */
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int remap; /* 1= Translate pixel data */
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struct
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{
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int x; /* X offset of viewport within bitmap */
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int y; /* Y offset of viewport within bitmap */
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int w; /* Width of viewport */
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int h; /* Height of viewport */
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int ow; /* Previous width of viewport */
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int oh; /* Previous height of viewport */
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int changed; /* 1= Viewport width or height have changed */
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} viewport;
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} t_bitmap;
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typedef struct
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{
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int sample_rate; /* Output Sample rate (8000-48000) */
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float frame_rate; /* Output Frame rate (usually 50 or 60 frames per second) */
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int enabled; /* 1= sound emulation is enabled */
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int buffer_size; /* Size of sound buffer (in bytes) */
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int16 *buffer[2]; /* Signed 16-bit stereo sound data */
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struct
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{
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int32 *pos;
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int32 *buffer;
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} fm;
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struct
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{
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int16 *pos;
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int16 *buffer;
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} psg;
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} t_snd;
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/* Global variables */
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extern t_bitmap bitmap;
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extern t_snd snd;
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extern uint32 mcycles_z80;
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extern uint32 mcycles_68k;
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extern uint32 mcycles_vdp;
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extern uint8 system_hw;
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/* Function prototypes */
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extern int audio_init(int samplerate,float framerate);
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extern void audio_reset(void);
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extern void audio_shutdown(void);
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extern int audio_update(void);
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extern void audio_set_equalizer(void);
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extern void system_init(void);
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extern void system_reset(void);
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extern void system_shutdown(void);
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extern void (*system_frame)(int do_skip);
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#endif /* _SYSTEM_H_ */
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