mirror of
https://github.com/libretro/smsplus-gx.git
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89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/******************************************************************************
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* Sega Master System / GameGear Emulator
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* Copyright (C) 1998-2007 Charles MacDonald
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*
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* additionnal code by Eke-Eke (SMS Plus GX)
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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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* Video Display Processor (VDP) emulation.
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*
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******************************************************************************/
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#ifndef _VDP_H_
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#define _VDP_H_
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/*
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vdp1
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mode 4 when m4 set and m1 reset
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vdp2
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mode 4 when m4 set and m2,m1 != 1,0
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*/
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/* VDP context */
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typedef struct
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{
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uint8 vram[0x4000];
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uint8 cram[0x40];
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uint8 reg[0x10];
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uint8 vscroll;
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uint8 status;
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uint8 latch;
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uint8 pending;
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uint16 addr;
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uint8 code;
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uint8 buffer;
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int pn, ct, pg, sa, sg;
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int ntab;
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int satb;
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int line;
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int left;
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uint16 lpf;
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uint8 height;
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uint8 extended;
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uint8 mode;
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uint8 irq;
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uint8 vint_pending;
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uint8 hint_pending;
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uint16 cram_latch;
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uint16 spr_col;
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uint8 spr_ovr;
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uint8 bd;
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} vdp_t;
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/* Global data */
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extern vdp_t vdp;
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extern uint8 hc_256[228];
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/* Function prototypes */
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extern void vdp_init(void);
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extern void vdp_shutdown(void);
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extern void vdp_reset(void);
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extern void viewport_check(void);
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extern uint8 vdp_counter_r(int offset);
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extern uint8 vdp_read(int offset);
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extern void vdp_write(int offset, uint8 data);
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extern void gg_vdp_write(int offset, uint8 data);
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extern void md_vdp_write(int offset, uint8 data);
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extern void tms_write(int offset, int data);
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#endif /* _VDP_H_ */
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