src/mesa/drivers/dos/vga.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  4.1
   4  *
   5  * Copyright (C) 1999  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /*
  26  * DOS/DJGPP device driver v1.6 for Mesa
  27  *
  28  *  Copyright (C) 2002 - Borca Daniel
  29  *  Email : dborca@users.sourceforge.net
  30  *  Web   : http://www.geocities.com/dborca
  31  */
  32
  33
  34 #include <pc.h>
  35 #include <stdlib.h>
  36
  37 #include "video.h"
  38 #include "vga.h"
  39
  40
  41
  42 static vl_mode modes[] = {
  43        {
  44         /* .xres    = */ 320,
  45         /* .yres    = */ 200,
  46         /* .bpp     = */ 8,
  47         /* .mode    = */ 0x13 | 0x4000,
  48         /* .scanlen = */ 320,
  49         /* .sel     = */ -1,
  50         /* .gran    = */ 320*200
  51        },
  52        {
  53         /* .xres    = */ -1,
  54         /* .yres    = */ -1,
  55         /* .bpp     = */ -1,
  56         /* .mode    = */ 0xffff,
  57         /* .scanlen = */ -1,
  58         /* .sel     = */ -1,
  59         /* .gran    = */ -1
  60        }
  61 };
  62
  63 static word16 vga_ver;
  64 static int linear_selector;
  65 static int oldmode = -1;
  66
  67 #define vga_color_precision 6
  68
  69
  70
  71 /* Desc: Attempts to detect VGA, check video modes and create selectors.
  72  *
  73  * In  : -
  74  * Out : mode array
  75  *
  76  * Note: -
  77  */
  78 static vl_mode *vga_init (void)
  79 {
  80  int rv = 0;
  81
  82  if (vga_ver) {
  83     return modes;
  84  }
  85
  86  __asm("\n\
  87                 movw    $0x1a00, %%ax   \n\
  88                 int     $0x10           \n\
  89                 cmpb    $0x1a, %%al     \n\
  90                 jne     0f              \n\
  91                 cmpb    $0x07, %%bl     \n\
  92                 jb      0f              \n\
  93                 andl    $0xff, %%ebx    \n\
  94                 movl    %%ebx, %0       \n\
  95  0:":"=g"(rv)::"%eax", "%ebx");
  96  if (rv == 0) {
  97     return NULL;
  98  }
  99
 100  if (_create_selector(&linear_selector, 0xa0000, 0x10000)) {
 101     return NULL;
 102  }
 103
 104  modes[0].sel = linear_selector;
 105
 106  vga_ver = rv;
 107  return modes;
 108 }
 109
 110
 111
 112 /* Desc: Frees all resources allocated by VGA init code.
 113  *
 114  * In  : -
 115  * Out : -
 116  *
 117  * Note: -
 118  */
 119 static void vga_fini (void)
 120 {
 121  if (vga_ver) {
 122     _remove_selector(&linear_selector);
 123  }
 124 }
 125
 126
 127
 128 /* Desc: Attempts to enter specified video mode.
 129  *
 130  * In  : ptr to mode structure, refresh rate
 131  * Out : 0 if success
 132  *
 133  * Note: -
 134  */
 135 static int vga_entermode (vl_mode *p, int refresh)
 136 {
 137  if (!(p->mode & 0x4000)) {
 138     return -1;
 139  }
 140  VGA.blit = _can_mmx() ? vesa_l_dump_virtual_mmx : vesa_l_dump_virtual;
 141
 142  if (oldmode == -1) {
 143     __asm("\n\
 144                 movb    $0x0f, %%ah     \n\
 145                 int     $0x10           \n\
 146                 andl    $0xff, %%eax    \n\
 147                 movl    %%eax, %0       \n\
 148     ":"=g"(oldmode)::"%eax", "%ebx");
 149  }
 150
 151  __asm("int $0x10"::"a"(p->mode&0xff));
 152
 153  return 0;
 154
 155  (void)refresh; /* silence compiler warning */
 156 }
 157
 158
 159
 160 /* Desc: Restores to the mode prior to first call to vga_entermode.
 161  *
 162  * In  : -
 163  * Out : -
 164  *
 165  * Note: -
 166  */
 167 static void vga_restore (void)
 168 {
 169  if (oldmode != -1) {
 170     __asm("int $0x10"::"a"(oldmode));
 171     oldmode = -1;
 172  }
 173 }
 174
 175
 176
 177 /* Desc: set one palette entry
 178  *
 179  * In  : color index, R, G, B
 180  * Out : -
 181  *
 182  * Note: uses integer values
 183  */
 184 static void vga_setCI_i (int index, int red, int green, int blue)
 185 {
 186 #if 0
 187  __asm("\n\
 188                 movw $0x1010, %%ax      \n\
 189                 movb %1, %%dh           \n\
 190                 movb %2, %%ch           \n\
 191                 int  $0x10              \n\
 192  "::"b"(index), "m"(red), "m"(green), "c"(blue):"%eax", "%edx");
 193 #else
 194  outportb(0x03C8, index);
 195  outportb(0x03C9, red);
 196  outportb(0x03C9, green);
 197  outportb(0x03C9, blue);
 198 #endif
 199 }
 200
 201
 202
 203 /* Desc: set one palette entry
 204  *
 205  * In  : color index, R, G, B
 206  * Out : -
 207  *
 208  * Note: uses normalized values
 209  */
 210 static void vga_setCI_f (int index, float red, float green, float blue)
 211 {
 212  float max = (1 << vga_color_precision) - 1;
 213
 214  vga_setCI_i(index, (int)(red * max), (int)(green * max), (int)(blue * max));
 215 }
 216
 217
 218
 219 /* Desc: state retrieval
 220  *
 221  * In  : parameter name, ptr to storage
 222  * Out : 0 if request successfully processed
 223  *
 224  * Note: -
 225  */
 226 static int vga_get (int pname, int *params)
 227 {
 228  switch (pname) {
 229         case VL_GET_CI_PREC:
 230              params[0] = vga_color_precision;
 231              break;
 232         default:
 233              return -1;
 234  }
 235  return 0;
 236 }
 237
 238
 239
 240 /*
 241  * the driver
 242  */
 243 vl_driver VGA = {
 244           vga_init,
 245           vga_entermode,
 246           NULL,
 247           vga_setCI_f,
 248           vga_setCI_i,
 249           vga_get,
 250           vga_restore,
 251           vga_fini
 252 };