mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-09 20:35:07 +01:00
94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/***************************************************************************************
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* Genesis Plus 1.2a
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* Video Display Processor (memory handlers)
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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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* modified by Eke-Eke (compatibility fixes & additional code), GC/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 _VDP_H_
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#define _VDP_H_
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/* VDP context */
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extern uint8 sat[0x400];
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extern uint8 vram[0x10000];
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extern uint8 cram[0x80];
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extern uint8 vsram[0x80];
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extern uint8 reg[0x20];
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extern uint16 addr;
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extern uint16 addr_latch;
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extern uint8 code;
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extern uint8 pending;
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extern uint16 status;
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extern uint8 dmafill;
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extern uint8 hint_pending;
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extern uint8 vint_pending;
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extern uint8 vint_triggered;
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extern int8 hvint_updated;
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/* Global variables */
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extern uint16 ntab;
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extern uint16 ntbb;
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extern uint16 ntwb;
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extern uint16 satb;
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extern uint16 hscb;
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extern uint8 border;
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extern uint8 bg_name_dirty[0x800];
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extern uint16 bg_name_list[0x800];
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extern uint16 bg_list_index;
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extern uint8 bg_pattern_cache[0x80000];
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extern uint8 playfield_shift;
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extern uint8 playfield_col_mask;
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extern uint16 playfield_row_mask;
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extern uint32 y_mask;
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extern int16 h_counter;
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extern int16 hc_latch;
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extern uint16 v_counter;
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extern uint8 im2_flag;
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extern uint32 dma_length;
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extern int32 fifo_write_cnt;
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extern uint32 fifo_lastwrite;
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extern uint8 fifo_latency;
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extern uint8 vdp_pal;
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extern double vdp_timings[4][4];
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extern uint8 *vctab;
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extern uint8 *hctab;
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extern uint8 vc_ntsc_224[262];
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extern uint8 vc_pal_224[313];
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extern uint8 vc_pal_240[313];
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extern uint8 cycle2hc32[488];
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extern uint8 cycle2hc40[488];
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/* Function prototypes */
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extern void vdp_init(void);
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extern void vdp_reset(void);
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extern void vdp_shutdown(void);
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extern void vdp_restore(uint8 *vdp_regs);
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extern void vdp_ctrl_w(unsigned int data);
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extern unsigned int vdp_ctrl_r(void);
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extern void vdp_data_w(unsigned int data);
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extern unsigned int vdp_data_r(void);
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extern unsigned int vdp_hvc_r(void);
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extern void vdp_reg_w(unsigned int r, unsigned int d);
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extern void dma_update();
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extern void vdp_test_w(unsigned int value);
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#endif /* _VDP_H_ */
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