mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/***************************************************************************************
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* Genesis Plus 1.2a
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* Main 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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* modified by Eke-Eke (compatibility fixes & additional code), GC/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_GENESIS 0
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#define SYSTEM_MEGADRIVE 1
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#define SYSTEM_PICO 2
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/* CPU cycles increments */
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#define z80cycles_per_line 228
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#define m68cycles_per_line 488
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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 (32+512+32) */
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int height; /* Bitmap height (256) */
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int depth; /* Color depth (8 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; /* Sample rate (8000-48000) */
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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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int curStage;
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int lastStage;
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int *buffer[2];
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float *src_out; /* SRC conversion buffer */
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} fm;
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struct
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{
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int curStage;
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int lastStage;
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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 uint16 lines_per_frame;
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extern uint8 vdp_rate;
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extern uint32 aim_m68k;
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extern uint32 count_m68k;
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extern uint32 line_m68k;
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extern uint32 hint_m68k;
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extern uint32 aim_z80;
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extern uint32 count_z80;
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extern uint32 line_z80;
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extern int32 current_z80;
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extern uint8 interlaced;
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extern uint8 odd_frame;
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extern uint32 frame_cnt;
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extern uint8 system_hw;
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/* Function prototypes */
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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 int system_frame(int skip);
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extern int audio_init (int rate);
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extern void audio_shutdown (void);
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extern void audio_update (void);
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extern void z80_run (int cyc);
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#endif /* _SYSTEM_H_ */
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