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/*
* vicii.h - A cycle-exact event-driven MOS6569 (VIC-II) emulation.
*
* Written by
* Ettore Perazzoli (ettore@comm2000.it)
*
* This file is part of VICE, the Versatile Commodore Emulator.
* See README for copyright notice.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA.
*
*/
#ifndef _VICII_H
#define _VICII_H
#include "vice.h"
#include "maincpu.h"
#include "video.h"
/* Color definitions. */
#define VIC_II_NUM_COLORS 16
/* Screen constants. */
#define VIC_II_SCREEN_HEIGHT 312
#if 0
#define VIC_II_SCREEN_WIDTH 411
#else
/* Not the real size, but more than enough for everything. Emulating a smaller
screen makes it faster. */
#define VIC_II_SCREEN_WIDTH 384
#endif
#define VIC_II_SCREEN_XPIX 320
#define VIC_II_SCREEN_YPIX 200
#define VIC_II_SCREEN_TEXTCOLS 40
#define VIC_II_SCREEN_TEXTLINES 25
#define VIC_II_SCREEN_MAX_TEXTCOLS VIC_II_SCREEN_TEXTCOLS
#define VIC_II_SCREEN_MAX_XPIX XPIX
#define VIC_II_SCREEN_MAX_YPIX YPIX
#define VIC_II_SCREEN_MAX_HEIGHT VIC_II_SCREEN_HEIGHT
#define VIC_II_SCREEN_BORDERWIDTH 32
#define VIC_II_SCREEN_BORDERHEIGHT 51
#define VIC_II_SCREEN_CHARHEIGHT 8
#define VIC_II_NUM_SPRITES 8
#define VIC_II_MAX_SPRITE_WIDTH 48
#define VIC_II_SPRITE_WRAP_X 504
#define VIC_II_FIRST_DISPLAYED_LINE 0x10
#define VIC_II_LAST_DISPLAYED_LINE 0x11f
#define VIC_II_25ROW_START_LINE 0x33
#define VIC_II_25ROW_STOP_LINE 0xfb
#define VIC_II_24ROW_START_LINE 0x37
#define VIC_II_24ROW_STOP_LINE 0xf7
#define VIC_II_40COL_START_PIXEL 0x20
#define VIC_II_40COL_STOP_PIXEL 0x160
#define VIC_II_38COL_START_PIXEL 0x27
#define VIC_II_38COL_STOP_PIXEL 0x157
/* Available video modes. The number is given by
((vic[0x11] & 0x60) | (vic[0x16] & 0x10)) >> 4. */
#define VIC_II_NORMAL_TEXT_MODE 0
#define VIC_II_MULTICOLOR_TEXT_MODE 1
#define VIC_II_HIRES_BITMAP_MODE 2
#define VIC_II_MULTICOLOR_BITMAP_MODE 3
#define VIC_II_EXTENDED_TEXT_MODE 4
#define VIC_II_ILLEGAL_TEXT_MODE 5
#define VIC_II_ILLEGAL_BITMAP_MODE_1 6
#define VIC_II_ILLEGAL_BITMAP_MODE_2 7
/* Special mode for idle state. (used by raster.c) */
#define VIC_II_IDLE_MODE 8
#define VIC_II_NUM_VMODES 9
#define VIC_II_IS_ILLEGAL_MODE(x) ((x) >= VIC_II_ILLEGAL_TEXT_MODE \
&& (x) != VIC_II_IDLE_MODE)
#define VIC_II_IS_BITMAP_MODE(x) ((x) & 0x02)
/* Define proper constants for raster.h. */
#ifdef _VICII_C
#define __VIC_II__
#include "c64.h"
#define CYCLES_PER_LINE C64_PAL_CYCLES_PER_LINE
#define NEEDS_GetData
#define NEEDS_GetDataHiLo
#define NEEDS_GetCharData
#define SCREEN_WIDTH VIC_II_SCREEN_WIDTH
#define SCREEN_HEIGHT VIC_II_SCREEN_HEIGHT
#define SCREEN_XPIX VIC_II_SCREEN_XPIX
#define SCREEN_YPIX VIC_II_SCREEN_YPIX
#define SCREEN_TEXTCOLS VIC_II_SCREEN_TEXTCOLS
#define SCREEN_TEXTLINES VIC_II_SCREEN_TEXTLINES
#define SCREEN_MAX_TEXTCOLS VIC_II_SCREEN_MAX_TEXTCOLS
#define SCREEN_MAX_XPIX VIC_II_SCREEN_MAX_XPIX
#define SCREEN_MAX_YPIX VIC_II_SCREEN_MAX_YPIX
#define SCREEN_MAX_HEIGHT VIC_II_SCREEN_MAX_HEIGHT
#define SCREEN_BORDERWIDTH VIC_II_SCREEN_BORDERWIDTH
#define SCREEN_BORDERHEIGHT VIC_II_SCREEN_BORDERHEIGHT
#define SCREEN_NUM_VMODES VIC_II_NUM_VMODES
#define SCREEN_CYCLES_PER_LINE VIC_II_CYCLES_PER_LINE
#define SCREEN_RFSH_PER_SEC VIC_II_RFSH_PER_SEC
#define SCREEN_CHARHEIGHT VIC_II_SCREEN_CHARHEIGHT
#define SCREEN_NUM_COLORS VIC_II_NUM_COLORS
#define SCREEN_FIRST_DISPLAYED_LINE VIC_II_FIRST_DISPLAYED_LINE
#define SCREEN_LAST_DISPLAYED_LINE VIC_II_LAST_DISPLAYED_LINE
#define SCREEN_IDLE_MODE VIC_II_IDLE_MODE
#define SCREEN_NUM_SPRITES VIC_II_NUM_SPRITES
#define SCREEN_MAX_SPRITE_WIDTH VIC_II_MAX_SPRITE_WIDTH
#define SCREEN_SPRITE_WRAP_X VIC_II_SPRITE_WRAP_X
#define GFXMSK_LEFTBORDER_SIZE ((SCREEN_MAX_SPRITE_WIDTH + \
SCREEN_BORDERWIDTH) / 8 + 1)
#define GFXMSK_SIZE ((SCREEN_WIDTH \
+ SCREEN_MAX_SPRITE_WIDTH) / 8 + 1)
#define SCREEN_GFXMSK_SIZE GFXMSK_SIZE
#endif /* defined(__VIC_II__) */
extern int vic_ii_init_resources(void);
extern int vic_ii_init_cmdline_options(void);
extern canvas_t vic_ii_init(void);
extern void vic_ii_exposure_handler(unsigned int width, unsigned int height);
extern BYTE REGPARM1 read_vic(ADDRESS addr);
extern void REGPARM2 store_vic(ADDRESS addr, BYTE value);
extern BYTE REGPARM1 read_colorram(ADDRESS addr);
extern void REGPARM2 store_colorram(ADDRESS addr, BYTE value);
extern void REGPARM2 store_vbank(ADDRESS addr, BYTE value);
extern void REGPARM2 store_vbank_39xx(ADDRESS addr, BYTE value);
extern void REGPARM2 store_vbank_3fxx(ADDRESS addr, BYTE value);
extern void video_resize(void);
extern void video_free(void);
extern int int_rasterdraw(long offset);
extern int int_rasterfetch(long offset);
extern int int_raster(long offset);
extern void vic_ii_prevent_clk_overflow(CLOCK sub);
extern void vic_ii_trigger_light_pen(CLOCK mclk);
extern void vic_ii_set_vbank(int new_vbank);
extern void vic_ii_set_ram_base(BYTE *base);
extern void reset_vic_ii(void);
extern void vic_ii_enable_extended_keyboard_rows(int flag);
extern int vbank;
extern CLOCK vic_ii_fetch_clk, vic_ii_draw_clk;
/* ------------------------------------------------------------------------- */
inline static void vic_ii_handle_pending_alarms(int num_write_cycles)
{
if (num_write_cycles != 0) {
int f;
/* Cycles can be stolen only during the read accesses, so we serve
only the events that happened during them. The last read access
happened at `clk - maincpu_write_cycles()' as all the opcodes
except BRK and JSR do all the write accesses at the very end. BRK
cannot take us here and we would not be able to handle JSR
correctly anyway, so we don't care about them... */
/* Go back to the time when the read accesses happened and serve VIC
events. */
clk -= num_write_cycles;
do {
f = 0;
if (clk > vic_ii_fetch_clk) {
int_rasterfetch(0);
f = 1;
}
if (clk >= vic_ii_draw_clk) {
int_rasterdraw(clk - vic_ii_draw_clk);
f = 1;
}
} while (f);
/* Go forward to the time when the last write access happens (that's
the one we care about, as the only instructions that do two write
accesses - except BRK and JSR - are the RMW ones, which store the
old value in the first write access, and then store the new one in
the second write access). */
clk += num_write_cycles;
} else {
int f;
do {
f = 0;
if (clk >= vic_ii_fetch_clk) {
int_rasterfetch(0);
f = 1;
}
if (clk >= vic_ii_draw_clk) {
int_rasterdraw(0);
f = 1;
}
} while (f);
}
}
#endif /* _VICII_H */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.