/* * crtctypes.h - A CRTC emulation (under construction) * * Written by * Ettore Perazzoli * Andre Fachat * * 16/24bpp support added by * Steven Tieu * Teemu Rantanen * * 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 VICE_CRTCTYPES_H #define VICE_CRTCTYPES_H #include "crtc.h" #include "raster.h" #include "types.h" enum crtc_video_mode_s { CRTC_STANDARD_MODE, CRTC_REVERSE_MODE, CRTC_NUM_VMODES }; typedef enum crtc_video_mode_s crtc_video_mode_t; #define CRTC_IDLE_MODE CRTC_STANDARD_MODE #define CRTC_NUM_COLORS 2 struct alarm_s; struct video_chip_cap_s; struct crtc_s { /* Flag: Are we initialized? */ int initialized; /*---------------------------------------------------------------*/ /* window size computed by crtc_set_screen_options() */ unsigned int screen_width; unsigned int screen_height; bool delayed_resize; /* nr of scanlines has changed; act on a batch of changes */ /* hardware options as given to crtc_set_hw_options() */ int hw_cursor; int hw_cols; /* 1 or 2, number of chars per cycle */ int hw_blank; int beam_offset; /* mystery correction offset... */ int vaddr_mask; /* how many bits (mask) in the video base address are * connected to hardware. */ int vaddr_mask_eff; /* how many effective address bits we can generate; * when 2 chars per cycle, this is 1 more bit. */ int vaddr_charswitch; /* which bit (mask) in vaddr selects the other * half of the character generator. */ int vaddr_charoffset; int vaddr_revswitch; /* which bit (mask) in vaddr inverts the screen */ /* screen and charset memory options (almost) as given to crtc_set_chargen_addr() and crtc_set_screen_addr() */ uint8_t *screen_base; uint8_t *chargen_base; int chargen_mask; int chargen_offset; /* those values are derived */ int chargen_rel; /* currently used charset rel. to chargen_base */ int screen_rel; /* current screen line rel. to screen_base */ /* internal CRTC state variables */ int regno; /* current register selected with store to addr 0 */ /* The alarm handler is called in the last cycles of a rasterline. Some effects need better timing, though */ /* rasterline variables */ CLOCK rl_start; /* clock when the current rasterline starts (left edge of text area) */ int rl_visible; /* number of visible chars in this line */ int rl_sync; /* character in line when the sync starts */ int rl_len; /* length of line in cycles */ int sync_diff; /* cycles between two sync pulses */ /* values of the previous rasterline */ int prev_rl_visible; int prev_rl_sync; int prev_rl_len; int prev_screen_rel; /* internal state */ int hjitter; /* horizontal jitter when sync phase is changed */ int xoffset; /* pixel-offset of current rasterline */ int screen_xoffset; /* pixel-offset of current rasterline */ int screen_hsync; /* reference position of hsync at top of screen */ int screen_yoffset; /* rasterline-offset of CRTC to VICE screen */ int henable; /* flagged when horizontal enable flipflop has not been reset in line */ int current_line; /* current rasterline as of CRTC counting */ int framelines; /* expected number of rasterlines for current frame, decreasing till end */ int venable; /* flagged when vertical enable flipflop has not been reset in frame */ bool off_screen; /* set when the crt ray is considered off-screen */ int vsync; /* number of rasterlines till end of vsync */ int current_charline; /* state of the current character line counter */ int blank; /* external blank (only honored if hw_blank set) */ int vadj_counter; /* counter for scanlines before vertical blank */ /* frame */ CLOCK frame_start; /* when did the last frame start */ /* last frame length */ long cycles_per_frame; /*---------------------------------------------------------------*/ int crsrmode; /* 0=no crsr, 1=continous, 2=1/32, 3=1/16 */ int crsrcnt; /* framecounter */ int crsrstate; /* 1=crsr active */ int cursor_lines; /* flagged when rasterline within hw cursor lines */ /*---------------------------------------------------------------*/ /* this is the function to be called when the retrace signal changes. type&1=0: old PET, type&1=1: CRTC-PET. retrace_type Also used by crtc_offscreen() */ machine_crtc_retrace_signal_t retrace_callback; crtc_hires_draw_t hires_draw_callback; int retrace_type; /*---------------------------------------------------------------*/ /* All the CRTC logging goes here. */ signed int log; /* CRTC raster. */ raster_t raster; /* CRTC registers. */ uint8_t regs[64]; /* Alarm to update a raster line. */ struct alarm_s *raster_draw_alarm; /* Video chip capabilities. */ struct video_chip_cap_s *video_chip_cap; #if CRTC_BEAM_RACING /* * On real 2001s, the retrace interrupt is triggered at the END of the * last scan line of the visible text area. The normal raster alarm runs * at the start of the next line, which is too late. */ struct alarm_s *adjusted_retrace_alarm; uint8_t prefetch[256*2]; /* maximum theoretical size */ #endif }; /* internal registers */ #define CRTC_REG_HTOTAL 0x00 /* R0 total horizontal characters - 1 */ #define CRTC_REG_HDISP 0x01 /* R1 displayed horizontal characters */ #define CRTC_REG_HSYNC 0x02 /* R2 horizontal sync position */ #define CRTC_REG_SYNCWIDTH 0x03 /* R3 vertical / horizontal sync width */ #define CRTC_REG_VTOTAL 0x04 /* R4 total vertical characters - 1 */ #define CRTC_REG_VTOTALADJ 0x05 /* R5 total vertical lines adjustment */ #define CRTC_REG_VDISP 0x06 /* R6 displayed vertical characters */ #define CRTC_REG_VSYNC 0x07 /* R7 vertical sync position */ #define CRTC_REG_MODECTRL 0x08 /* R8 */ #define CRTC_REG_SCANLINE 0x09 /* R9 scanlines per character row - 1, including spacing */ #define CRTC_REG_CURSORSTART 0x0a /* R10 */ #define CRTC_REG_CURSOREND 0x0b /* R11 */ #define CRTC_REG_DISPSTARTH 0x0c /* R12 */ #define CRTC_REG_DISPSTARTL 0x0d /* R13 */ #define CRTC_REG_CURSORPOSH 0x0e /* R14 cursor position */ #define CRTC_REG_CURSORPOSL 0x0f /* R15 */ #define CRTC_REG_LPENH 0x10 /* R16 lightpen position */ #define CRTC_REG_LPENL 0x11 /* R17 */ typedef struct crtc_s crtc_t; extern crtc_t crtc; /* those define the invisible borders, where we never paint anything */ #define CRTC_SCREEN_BORDERWIDTH 8 #define CRTC_SCREEN_BORDERHEIGHT 8 /* FIXME: 16 doesn't work with bug 2175 */ /* These define the extra space around the size given from the machine, to allow effects like open borders etc. */ #define CRTC_EXTRA_COLS 6 #define CRTC_EXTRA_RASTERLINES 0 /* FIXME: only works when 0 with bug 2175 */ #endif