Genesis-Plus-GX/source/system.h
EkeEke 28775cc3aa [Core/SCD]
----------
* added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX
rotation/scaling, etc)
* added .ISO & .BIN CD image file support
* added 512K backup cartridge RAM support
* added savestate support for CD games

NOTES:
~~~~~~
* to play CD games, original BIOS ROM files are required in /genplus/bios/
directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin
* CD audio tracks (CD-DA) are not supported (yet)

[Core/CPU]
----------
* modified 68k core for Mega CD / Sega CD support

[Core/VDP]
---------------
* improved DMA accuracy
* added support for 8-bit VRAM writes with undocumented code value (verified on
real hardware by Nemesis)

[Gamecube/Wii]
---------------
* modified Master System & Game Gear "BIOS" support (files should be named
bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios
directory).
* replaced "Hard Reset" button by a Soft Reset for systems having a Reset button
(Mega Drive / Genesis & Master System)
* State & SRAM files are now only compressed when saving to Gamecube Memory
Cards
* various fixes & cleanup.

[Core/SCD]
----------
* added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX
rotation/scaling, etc)
* added .ISO & .BIN CD image file support
* added 512K backup cartridge RAM support
* added savestate support for CD games

NOTES:
~~~~~~
* to play CD games, original BIOS ROM files are required in /genplus/bios/
directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin
* CD audio tracks (CD-DA) are not supported (yet)

[Core/CPU]
----------
* modified 68k core for Mega CD / Sega CD support

[Core/VDP]
---------------
* improved DMA accuracy
* added support for 8-bit VRAM writes with undocumented code value (verified on
real hardware by Nemesis)

[Gamecube/Wii]
---------------
* modified Master System & Game Gear "BIOS" support (files should be named
bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios
directory).
* replaced "Hard Reset" button by a Soft Reset for systems having a Reset button
(Mega Drive / Genesis & Master System)
* State & SRAM files are now only compressed when saving to Gamecube Memory
Cards
* various fixes & cleanup.
2012-07-05 21:45:37 +02:00

134 lines
4.7 KiB
C

/***************************************************************************************
* Genesis Plus
* Virtual System emulation
*
* Support for "Genesis", "Genesis + CD" & "Master System" modes
*
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2012 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
#define SYSTEM_MCD 0x84
/* NTSC & PAL Master Clock frequencies */
#define MCLOCK_NTSC 53693175
#define MCLOCK_PAL 53203424
/* 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) */
double 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) */
struct
{
int32 *pos;
int32 *buffer;
} fm;
struct
{
int16 *pos;
int16 *buffer;
} psg;
struct
{
int16 *pos;
int16 *buffer;
} pcm;
} t_snd;
/* Global variables */
extern t_bitmap bitmap;
extern t_snd snd;
extern uint32 mcycles_vdp;
extern int16 SVP_cycles;
extern uint8 system_hw;
extern uint8 system_bios;
extern uint32 system_clock;
/* Function prototypes */
extern int audio_init(int samplerate, double framerate);
extern void audio_reset(void);
extern void audio_shutdown(void);
extern int audio_update(int16 *buffer);
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_scd(int do_skip);
extern void system_frame_sms(int do_skip);
#endif /* _SYSTEM_H_ */