mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-12 13:55:07 +01:00
2b78421402
------ * improved 68k accuracy (initial reset timing + auto-vectored interrupts handling). * modified Z80 & 68k cores to directly use external cycle count instead of intermediate counters. * improved Z80 & 68k cpu execution/synchronization accuracy, now use Master Clock as common clock reference. * improved PSG & FM chips synchronization with CPU execution (fixed point precision). * completely rewrote sound output processing & mixing: sound chips are now clocked with exact output frame rate to ensure 100% smooth video & audio playback, with no lag or skipping, while still rendering an accurate number of samples per frame. This will also make fast-forward implementation (video AND sound) more trivial. * improved color accuracy in VDP highlight mode to match results observed on real hardware. * improved sprites processing timing accuracy: fixes (un)masked sprites in Mickey Mania (3D level), Sonic 2 (VS mode). * improved horizontal blanking & HINT/VINT occurrence timing accuracy, as measured on real hardware. * improved H-Counter accuracy in 40-cell mode, as measured on real hardware. * optimized Z80 bus status signals * usual code cleanup [GCN/WII] --------- fixed ASNDLIB exit when returning to game fixed audio/video startup sync modified audio back-end engine according to new audio processing core (see above)
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/***************************************************************************************
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* Genesis Plus
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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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* Eke-Eke (2007,2008,2009), 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_GENESIS 0
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#define SYSTEM_MEGADRIVE 1
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#define SYSTEM_PICO 2
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#define MCYCLES_PER_LINE 3420
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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; /* 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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int16 *pos;
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int16 *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_vdp;
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extern uint32 mcycles_z80;
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extern uint32 mcycles_68k;
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extern uint32 hint_68k;
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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 int system_frame(int skip);
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#endif /* _SYSTEM_H_ */
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