Genesis-Plus-GX/core/vdp_ctrl.h

107 lines
4.2 KiB
C

/***************************************************************************************
* Genesis Plus
* Video Display Processor (68k & Z80 CPU interface)
*
* Support for SG-1000 (TMS99xx & 315-5066), Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2022 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 uint8 h_counter;
extern uint16 v_counter;
extern uint16 vc_max;
extern uint16 vscroll;
extern uint16 lines_per_frame;
extern uint16 max_sprite_pixels;
extern int32 fifo_write_cnt;
extern uint32 fifo_slots;
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);
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_ */