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https://github.com/libretro/smsplus-gx.git
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88 lines
2.4 KiB
C
88 lines
2.4 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_t vram[0x4000];
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uint8_t cram[0x40];
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uint8_t reg[0x10];
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uint8_t vscroll;
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uint8_t status;
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uint8_t latch;
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uint8_t pending;
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uint8_t code;
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uint8_t buffer;
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uint8_t height;
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uint8_t extended;
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uint8_t irq;
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uint8_t vint_pending;
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uint8_t hint_pending;
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uint8_t spr_ovr;
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uint8_t bd;
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uint16_t lpf;
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uint16_t cram_latch;
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uint16_t addr;
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int32_t pn, ct, pg, sa, sg;
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int32_t ntab;
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int32_t satb;
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int32_t line;
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int32_t left;
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int32_t spr_col;
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int32_t mode;
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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_t 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_t vdp_counter_r(int32_t offset);
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extern uint8_t vdp_read(int32_t offset);
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extern void vdp_write(int32_t offset, uint8_t data);
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extern void gg_vdp_write(int32_t offset, uint8_t data);
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extern void md_vdp_write(int32_t offset, uint8_t data);
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extern void tms_write(int32_t offset, uint8_t data);
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#endif /* _VDP_H_ */
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