9bf1cd50f5
Removed threading support in SDL Rewrite of VGA Drawing to work line for line Rewrite of VGA Text drawing using lookup tables Rewrite of render function to handle the new line for line drawing. Changed CGA/TANDY/Hercules to be more like their original hardware. Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1611
330 lines
6.5 KiB
C
330 lines
6.5 KiB
C
/*
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* Copyright (C) 2002-2004 The DOSBox Team
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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 Library 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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#ifndef VGA_H_
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#define VGA_H_
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#include <mem.h>
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#include "dosbox.h"
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enum VGAModes {
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M_TEXT2,M_TEXT16,
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M_HERC,
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M_CGA2,M_CGA4,M_CGA16,
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M_TANDY16,
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M_EGA2,M_EGA4,M_EGA16,
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M_VGA,
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M_LIN8,
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M_ERROR,
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};
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#define CLK_25 25175
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#define CLK_28 28322
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#define MIN_VCO 180000
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#define MAX_VCO 360000
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#define S3_CLOCK_REF 14318 /* KHz */
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#define S3_CLOCK(_M,_N,_R) ((S3_CLOCK_REF * ((_M) + 2)) / (((_N) + 2) * (1 << (_R))))
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#define S3_MAX_CLOCK 150000 /* KHz */
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typedef struct {
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bool attrindex;
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} VGA_Internal;
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typedef struct {
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/* Memory handlers */
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Bitu mh_mask;
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/* Video drawing */
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Bitu display_start;
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Bitu real_start;
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bool retrace; /* A retrace is active */
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Bitu scan_len;
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Bitu cursor_start;
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/* Some other screen related variables */
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Bitu line_compare;
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bool chained; /* Enable or Disabled Chain 4 Mode */
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bool blinking; /* Attribute bit 7 is blinking */
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/* Pixel Scrolling */
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Bit8u pel_panning; /* Amount of pixels to skip when starting horizontal line */
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Bit8u hlines_skip;
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Bit8u bytes_skip;
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/* Specific stuff memory write/read handling */
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Bit8u read_mode;
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Bit8u write_mode;
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Bit8u read_map_select;
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Bit8u color_dont_care;
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Bit8u color_compare;
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Bit8u data_rotate;
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Bit8u raster_op;
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Bit32u full_bit_mask;
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Bit32u full_map_mask;
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Bit32u full_not_map_mask;
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Bit32u full_set_reset;
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Bit32u full_not_enable_set_reset;
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Bit32u full_enable_set_reset;
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Bit32u full_enable_and_set_reset;
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} VGA_Config;
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typedef struct {
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bool resizing;
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bool drawing;
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Bitu width;
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Bitu height;
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Bitu pitch;
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Bitu blocks;
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Bitu panning;
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Bitu address;
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Bitu address_add;
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Bitu address_line_total;
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Bitu address_line;
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Bitu lines_total;
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Bitu lines_left;
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Bitu lines_scaled;
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Bitu split_line;
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Bitu parts_total;
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Bitu parts_lines;
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Bitu parts_left;
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struct {
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Bitu vtotal;
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Bitu vstart;
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Bitu vend;
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Bitu htotal;
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Bitu hstart;
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Bitu hend;
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Bitu parts;
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} micro;
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Bitu scaleh;
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bool double_scan;
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bool double_scan_active;
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Bit8u font_height;
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Bit8u font[64*1024];
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Bitu font1_start;
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Bitu font2_start;
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struct {
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Bit8u sline,eline;
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Bit8u count,delay;
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Bit8u enabled;
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} cursor;
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} VGA_Draw;
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typedef struct {
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Bit8u bank;
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Bit8u reg_lock1;
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Bit8u reg_lock2;
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Bit8u reg_31;
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Bit8u reg_35;
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Bit8u reg_43;
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Bit8u reg_58;
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Bit8u reg_51;
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Bit8u reg_55;
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Bit8u ex_hor_overflow;
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Bit8u ex_ver_overflow;
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Bit16u la_window;
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struct {
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Bit8u r;
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Bit8u n;
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Bit8u m;
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} clk[4],mclk;
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struct {
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Bit8u lock;
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Bit8u cmd;
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} pll;
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} VGA_S3;
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typedef struct {
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Bit8u mode_control;
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Bit8u enable_bits;
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} VGA_HERC;
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typedef struct {
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Bit8u color_select;
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} VGA_CGA;
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typedef struct {
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Bit8u mem_bank;
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Bit8u disp_bank;
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Bit8u reg_index;
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bool set_reg;
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} VGA_TANDY;
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typedef struct {
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Bit8u index;
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Bit8u reset;
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Bit8u clocking_mode;
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Bit8u map_mask;
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Bit8u character_map_select;
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Bit8u memory_mode;
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} VGA_Seq;
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typedef struct {
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Bit8u palette[16];
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Bit8u mode_control;
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Bit8u horizontal_pel_panning;
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Bit8u overscan_color;
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Bit8u color_plane_enable;
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Bit8u color_select;
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Bit8u index;
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Bit8u enabled;
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} VGA_Attr;
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typedef struct {
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Bit8u horizontal_total;
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Bit8u horizontal_display_end;
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Bit8u start_horizontal_blanking;
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Bit8u end_horizontal_blanking;
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Bit8u start_horizontal_retrace;
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Bit8u end_horizontal_retrace;
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Bit8u vertical_total;
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Bit8u overflow;
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Bit8u preset_row_scan;
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Bit8u maximum_scan_line;
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Bit8u cursor_start;
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Bit8u cursor_end;
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Bit8u start_address_high;
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Bit8u start_address_low;
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Bit8u cursor_location_high;
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Bit8u cursor_location_low;
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Bit8u vertical_retrace_start;
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Bit8u vertical_retrace_end;
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Bit8u vertical_display_end;
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Bit8u offset;
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Bit8u underline_location;
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Bit8u start_vertical_blanking;
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Bit8u end_vertical_blanking;
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Bit8u mode_control;
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Bit8u line_compare;
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Bit8u index;
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bool read_only;
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} VGA_Crtc;
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typedef struct {
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Bit8u index;
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Bit8u set_reset;
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Bit8u enable_set_reset;
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Bit8u color_compare;
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Bit8u data_rotate;
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Bit8u read_map_select;
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Bit8u mode;
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Bit8u miscellaneous;
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Bit8u color_dont_care;
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Bit8u bit_mask;
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} VGA_Gfx;
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struct RGBEntry {
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Bit8u red;
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Bit8u green;
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Bit8u blue;
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};
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typedef struct {
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Bit8u bits; /* DAC bits, usually 6 or 8 */
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Bit8u pel_mask;
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Bit8u pel_index;
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Bit8u state;
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Bit8u write_index;
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Bit8u read_index;
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Bitu first_changed;
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RGBEntry rgb[0x100];
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Bit8u attr[16];
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} VGA_Dac;
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union VGA_Latch {
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Bit32u d;
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Bit8u b[4];
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};
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union VGA_Memory {
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Bit8u linear[512*1024*4];
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Bit8u paged[512*1024][4];
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VGA_Latch latched[512*1024];
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};
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typedef struct {
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VGAModes mode; /* The mode the vga system is in */
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Bit8u misc_output;
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VGA_Draw draw;
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VGA_Config config;
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VGA_Internal internal;
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/* Internal module groups */
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VGA_Seq seq;
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VGA_Attr attr;
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VGA_Crtc crtc;
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VGA_Gfx gfx;
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VGA_Dac dac;
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VGA_Latch latch;
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VGA_S3 s3;
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VGA_HERC herc;
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VGA_CGA cga;
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VGA_TANDY tandy;
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VGA_Memory mem;
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} VGA_Type;
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/* Functions for different resolutions */
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void VGA_SetMode(VGAModes mode);
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void VGA_SetupHandlers(void);
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void VGA_StartResize(void);
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void VGA_SetupDrawing(void);
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/* Some DAC/Attribute functions */
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void VGA_DAC_CombineColor(Bit8u attr,Bit8u pal);
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void VGA_ATTR_SetPalette(Bit8u index,Bit8u val);
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/* The VGA Subfunction startups */
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void VGA_SetupAttr(void);
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void VGA_SetupMemory(void);
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void VGA_SetupDAC(void);
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void VGA_SetupCRTC(void);
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void VGA_SetupMisc(void);
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void VGA_SetupGFX(void);
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void VGA_SetupSEQ(void);
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/* Some Support Functions */
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void VGA_SetClock(Bitu which,Bitu target);
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void VGA_DACSetEntirePalette(void);
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void VGA_StartRetrace(void);
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void VGA_StartUpdateLFB(void);
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extern VGA_Type vga;
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extern Bit32u ExpandTable[256];
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extern Bit32u FillTable[16];
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extern Bit32u CGA_2_Table[16];
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extern Bit32u CGA_4_Table[256];
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extern Bit32u CGA_16_Table[256];
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extern Bit32u TXT_Font_Table[16];
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extern Bit32u TXT_FG_Table[16];
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extern Bit32u TXT_BG_Table[16];
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extern Bit32u Expand16Table[4][16];
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extern Bit32u Expand16BigTable[0x10000];
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#endif
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