mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-04 18:05:06 +01:00
d66d747d98
- added port $3E emulation (SMS, GG) - added SMS & GG BIOS support - added an option to run BIOS without cartridge - added separate ROM browsers for SG-1000, Master System, Game Gear & Mega Drive / Genesis - changed Cheat menu icon - moved ROM device selection (SD,USB,DVD) to menu options - moved savestate compression/decompression out of emulator core - removed useless background images & background color option - prevented deletion of cheat files when no valid codes are found left - added IOS patch on startup to fix Homebrew Channel network bug when <no_ios_reload> option is used [GUI] -
124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
/***************************************************************************************
|
|
* Genesis Plus
|
|
* Virtual System emulation
|
|
*
|
|
* Support for Genesis & Master System compatibility modes
|
|
*
|
|
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
|
|
* Copyright (C) 2007-2011 Eke-Eke (Genesis Plus GX)
|
|
*
|
|
* Redistribution and use of this code or any derivative works are permitted
|
|
* provided that the following conditions are met:
|
|
*
|
|
* - Redistributions may not be sold, nor may they be used in a commercial
|
|
* product or activity.
|
|
*
|
|
* - Redistributions that are modified from the original source must include the
|
|
* complete source code, including the source code for all components used by a
|
|
* binary built from the modified sources. However, as a special exception, the
|
|
* source code distributed need not include anything that is normally distributed
|
|
* (in either source or binary form) with the major components (compiler, kernel,
|
|
* and so on) of the operating system on which the executable runs, unless that
|
|
* component itself accompanies the executable.
|
|
*
|
|
* - Redistributions must reproduce the above copyright notice, this list of
|
|
* conditions and the following disclaimer in the documentation and/or other
|
|
* materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************************/
|
|
|
|
#ifndef _SYSTEM_H_
|
|
#define _SYSTEM_H_
|
|
|
|
/* Supported hardware models */
|
|
#define SYSTEM_SG 0x10
|
|
#define SYSTEM_MARKIII 0x11
|
|
#define SYSTEM_SMS 0x20
|
|
#define SYSTEM_SMS2 0x21
|
|
#define SYSTEM_GG 0x40
|
|
#define SYSTEM_GGMS 0x41
|
|
#define SYSTEM_MD 0x80
|
|
#define SYSTEM_PBC 0x81
|
|
#define SYSTEM_PICO 0x82
|
|
|
|
/* Number of M-Cycles executed per line */
|
|
#define MCYCLES_PER_LINE 3420
|
|
|
|
/* Horizontal timing offsets when running in Z80 mode */
|
|
#define SMS_CYCLE_OFFSET 520
|
|
#define PBC_CYCLE_OFFSET 550
|
|
|
|
typedef struct
|
|
{
|
|
uint8 *data; /* Bitmap data */
|
|
int width; /* Bitmap width */
|
|
int height; /* Bitmap height */
|
|
int pitch; /* Bitmap pitch */
|
|
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_z80;
|
|
extern uint32 mcycles_68k;
|
|
extern uint32 mcycles_vdp;
|
|
extern int16 SVP_cycles;
|
|
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_gen(int do_skip);
|
|
extern void system_frame_sms(int do_skip);
|
|
|
|
#endif /* _SYSTEM_H_ */
|
|
|