mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-09-11 01:03:15 +02:00
28775cc3aa
---------- * 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.
105 lines
4.2 KiB
C
105 lines
4.2 KiB
C
/***************************************************************************************
|
|
* Genesis Plus
|
|
* Video Display Processor (68k & Z80 CPU interface)
|
|
*
|
|
* Support for SG-1000, Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
|
|
*
|
|
* 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 _VDP_H_
|
|
#define _VDP_H_
|
|
|
|
/* VDP context */
|
|
extern uint8 reg[0x20];
|
|
extern uint8 sat[0x400];
|
|
extern uint8 vram[0x10000];
|
|
extern uint8 cram[0x80];
|
|
extern uint8 vsram[0x80];
|
|
extern uint8 hint_pending;
|
|
extern uint8 vint_pending;
|
|
extern uint16 status;
|
|
extern uint32 dma_length;
|
|
|
|
/* Global variables */
|
|
extern uint16 ntab;
|
|
extern uint16 ntbb;
|
|
extern uint16 ntwb;
|
|
extern uint16 satb;
|
|
extern uint16 hscb;
|
|
extern uint8 bg_name_dirty[0x800];
|
|
extern uint16 bg_name_list[0x800];
|
|
extern uint16 bg_list_index;
|
|
extern uint8 hscroll_mask;
|
|
extern uint8 playfield_shift;
|
|
extern uint8 playfield_col_mask;
|
|
extern uint16 playfield_row_mask;
|
|
extern uint8 odd_frame;
|
|
extern uint8 im2_flag;
|
|
extern uint8 interlaced;
|
|
extern uint8 vdp_pal;
|
|
extern uint16 v_counter;
|
|
extern uint16 vc_max;
|
|
extern uint16 vscroll;
|
|
extern uint16 lines_per_frame;
|
|
extern int32 fifo_write_cnt;
|
|
extern uint32 fifo_lastwrite;
|
|
extern uint32 hvc_latch;
|
|
extern const uint8 *hctab;
|
|
|
|
/* Function pointers */
|
|
extern void (*vdp_68k_data_w)(unsigned int data);
|
|
extern void (*vdp_z80_data_w)(unsigned int data);
|
|
extern unsigned int (*vdp_68k_data_r)(void);
|
|
extern unsigned int (*vdp_z80_data_r)(void);
|
|
|
|
/* Function prototypes */
|
|
extern void vdp_init(void);
|
|
extern void vdp_reset(void);
|
|
extern int vdp_context_save(uint8 *state);
|
|
extern int vdp_context_load(uint8 *state, char *version);
|
|
extern void vdp_dma_update(unsigned int cycles);
|
|
extern void vdp_68k_ctrl_w(unsigned int data);
|
|
extern void vdp_z80_ctrl_w(unsigned int data);
|
|
extern void vdp_sms_ctrl_w(unsigned int data);
|
|
extern void vdp_tms_ctrl_w(unsigned int data);
|
|
extern unsigned int vdp_68k_ctrl_r(unsigned int cycles);
|
|
extern unsigned int vdp_z80_ctrl_r(unsigned int cycles);
|
|
extern unsigned int vdp_hvc_r(unsigned int cycles);
|
|
extern void vdp_test_w(unsigned int data);
|
|
extern int vdp_68k_irq_ack(int int_level);
|
|
|
|
#endif /* _VDP_H_ */
|