video.c revision 1.4
1 /* $NetBSD: video.c,v 1.4 1999/06/28 01:20:45 sakamoto Exp $ */ 2 3 /*- 4 * Copyright (C) 1995-1997 Gary Thomas (gdt (at) linuxppc.org) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Gary Thomas. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef CONS_BE 34 #include <stand.h> 35 #include "boot.h" 36 #include "iso_font.h" 37 38 #define FONT_WIDTH 8 39 #define FONT_HEIGHT 16 40 #define VRAM_WIDTH 640 41 #define VRAM_HEIGHT 480 42 #define VRAM_SIZE (VRAM_WIDTH * VRAM_HEIGHT) 43 #define ROW (VRAM_WIDTH / FONT_WIDTH) 44 #define COL (VRAM_HEIGHT / FONT_HEIGHT) 45 46 u_char *VramBase; 47 u_char save_cursor[FONT_WIDTH]; 48 49 /* 50 * The current state of virtual displays 51 */ 52 struct screen { 53 enum state { 54 NORMAL, /* no pending escape */ 55 ESC, /* saw ESC */ 56 EBRAC, /* saw ESC[ */ 57 EBRACEQ /* saw ESC[= */ 58 } state; /* command parser state */ 59 int cx; /* the first escape seq argument */ 60 int cy; /* the second escap seq argument */ 61 int *accp; /* pointer to the current processed argument */ 62 int row; 63 int col; 64 u_char fgcolor; 65 u_char bgcolor; 66 } screen; 67 68 69 void 70 video_init(buffer) 71 u_char *buffer; 72 { 73 struct screen *d = &screen; 74 75 VramBase = buffer; 76 d->fgcolor = 0x1f; /* WHITE */ 77 d->bgcolor = 0x00; /* BLACK */ 78 d->row = 0; 79 d->col = 0; 80 d->state = NORMAL; 81 memset(VramBase, d->bgcolor, VRAM_SIZE); 82 memset(save_cursor, d->bgcolor, FONT_WIDTH); 83 } 84 85 static void 86 wrtchar(c, d) 87 u_char c; 88 struct screen *d; 89 { 90 u_char *p = VramBase + 91 (d->col * VRAM_WIDTH * FONT_HEIGHT) + (d->row * FONT_WIDTH); 92 int fontbase = c * 16; 93 int x, y; 94 95 for (y = 0; y < FONT_HEIGHT; y++) { 96 for (x = 0; x < FONT_WIDTH; x++) { 97 if ((font[fontbase + y] >> (FONT_WIDTH - x)) & 1) 98 *(p + x + (y * VRAM_WIDTH)) = d->fgcolor; 99 else 100 *(p + x + (y * VRAM_WIDTH)) = d->bgcolor; 101 } 102 } 103 d->row++; 104 } 105 106 static void 107 cursor(d, flag) 108 struct screen *d; 109 int flag; 110 { 111 int x; 112 int y = FONT_HEIGHT - 1; 113 114 u_char *p = VramBase + 115 (d->col * VRAM_WIDTH * FONT_HEIGHT) + (d->row * FONT_WIDTH); 116 for (x = 0; x < FONT_WIDTH - 1; x++) { 117 if (flag) { 118 save_cursor[x] = *(p + x + (y * VRAM_WIDTH)); 119 *(p + x + (y * VRAM_WIDTH)) = d->fgcolor; 120 } else { 121 *(p + x + (y * VRAM_WIDTH)) = save_cursor[x]; 122 } 123 } 124 } 125 126 /* 127 * vga_putc (nee sput) has support for emulation of the 'ibmpc' termcap entry. 128 * This is a bare-bones implementation of a bare-bones entry 129 * One modification: Change li#24 to li#25 to reflect 25 lines 130 * "ca" is the color/attributes value (left-shifted by 8) 131 * or 0 if the current regular color for that screen is to be used. 132 */ 133 void 134 video_putc(c) 135 int c; 136 { 137 struct screen *d = &screen; 138 139 cursor(d, 0); 140 141 switch (d->state) { 142 case NORMAL: 143 switch (c) { 144 case 0x0: /* Ignore pad characters */ 145 return; 146 147 case 0x1B: 148 d->state = ESC; 149 break; 150 151 case '\t': 152 do { 153 wrtchar(' ', d); 154 } while (d->row % 8); 155 break; 156 157 case '\b': /* non-destructive backspace */ 158 d->row--; 159 if (d->row < 0) { 160 if (d->col > 0) { 161 d->col--; 162 d->row += ROW; /* prev column */ 163 } else { 164 d->row = 0; 165 } 166 } 167 break; 168 169 case '\n': 170 d->col++; 171 case '\r': 172 d->row = 0; 173 break; 174 175 case '\007': 176 break; 177 178 default: 179 wrtchar(c, d); 180 if (d->row >= ROW) { 181 d->row = 0; 182 d->col++; 183 } 184 break; 185 } 186 break; 187 188 case ESC: 189 case EBRAC: 190 case EBRACEQ: 191 break; 192 } 193 if (d->col >= COL) { /* scroll check */ 194 memcpy(VramBase, VramBase + VRAM_WIDTH * FONT_HEIGHT, 195 VRAM_SIZE - VRAM_WIDTH * FONT_WIDTH); 196 memset(VramBase + VRAM_SIZE - VRAM_WIDTH * FONT_HEIGHT, 197 d->bgcolor, VRAM_WIDTH * FONT_HEIGHT); 198 d->col = COL - 1; 199 } 200 cursor(d, 1); 201 } 202 #endif 203
Indexes created Mon Sep 29 21:09:56 GMT 2025