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https://github.com/libretro/Genesis-Plus-GX.git
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124 lines
4.9 KiB
C
124 lines
4.9 KiB
C
/***************************************************************************************
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* Genesis Plus
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* Virtual System emulation
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*
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* Support for 16-bit & 8-bit hardware modes
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*
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* Copyright (C) 1998-2003 Charles Mac Donald (original code)
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* Copyright (C) 2007-2024 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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#include "blip_buf.h"
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/* Supported hardware models */
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#define SYSTEM_SG 0x01
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#define SYSTEM_SGII 0x02
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#define SYSTEM_SGII_RAM_EXT 0x03
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#define SYSTEM_MARKIII 0x10
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#define SYSTEM_SMS 0x20
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#define SYSTEM_SMS2 0x21
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#define SYSTEM_GG 0x40
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#define SYSTEM_GGMS 0x41
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#define SYSTEM_MD 0x80
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#define SYSTEM_PBC 0x81
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#define SYSTEM_PICO 0x82
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#define SYSTEM_MCD 0x84
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/* NTSC & PAL Master Clock frequencies */
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#define MCLOCK_NTSC 53693175
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#define MCLOCK_PAL 53203424
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/* Number of M-Cycles executed per line */
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#define MCYCLES_PER_LINE 3420
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/* Horizontal timing offsets when running in Z80 mode */
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#define SMS_CYCLE_OFFSET 530
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#define PBC_CYCLE_OFFSET 560
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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 pitch; /* Bitmap pitch */
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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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double 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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blip_t* blips[3]; /* Blip Buffer resampling (stereo) */
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blip_buffer_state_t *blip_states[3]; /* states for suspending and restoring the sound buffer */
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int fm_last_save[2]; /* For saving and restoring the sound buffer */
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int16 cd_last_save[2]; /* For saving and restoring the sound buffer */
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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_vdp;
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extern int16 SVP_cycles;
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extern uint8 system_hw;
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extern uint8 system_bios;
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extern uint32 system_clock;
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/* Function prototypes */
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extern int audio_init(int samplerate, double framerate);
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extern void audio_set_rate(int samplerate, double 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(int16 *buffer);
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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_frame_gen(int do_skip);
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extern void system_frame_scd(int do_skip);
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extern void system_frame_sms(int do_skip);
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#endif /* _SYSTEM_H_ */
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