src/mesa/drivers/dos/video.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  4.0
   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 v1.5 for Mesa
  27  *
  28  *  Copyright (C) 2002 - Borca Daniel
  29  *  Email : dborca@users.sourceforge.net
  30  *  Web   : http://www.geocities.com/dborca
  31  *
  32  * Thanks to CrazyPyro (Neil Funk) for FakeColor
  33  */
  34
  35
  36 #include <stdlib.h>
  37
  38 #include "internal.h"
  39 #include "vesa.h"
  40 #include "vga.h"
  41 #include "video.h"
  42
  43
  44
  45 static vl_driver *drv;
  46 /* based upon mode specific data: valid entire session */
  47 int vl_video_selector;
  48 static vl_mode *video_mode;
  49 static int video_scanlen, video_bypp;
  50 /* valid until next buffer */
  51 void *vl_current_draw_buffer, *vl_current_read_buffer;
  52 int vl_current_stride, vl_current_width, vl_current_height, vl_current_bytes;
  53 int vl_current_offset, vl_current_delta;
  54
  55
  56
  57 #if HUGE_LOOKUP
  58 /* These lookup tables are used to extract RGB values in [0,255]
  59  * from 15/16-bit pixel values.
  60  */
  61 static unsigned char pix15r[0x8000];
  62 static unsigned char pix15g[0x8000];
  63 static unsigned char pix15b[0x8000];
  64 static unsigned char pix16r[0x10000];
  65 static unsigned char pix16g[0x10000];
  66 static unsigned char pix16b[0x10000];
  67 #else
  68 /* lookup table for scaling 5 bit colors up to 8 bits */
  69 static int _rgb_scale_5[32] = {
  70    0,   8,   16,  25,  33,  41,  49,  58,
  71    66,  74,  82,  90,  99,  107, 115, 123,
  72    132, 140, 148, 156, 165, 173, 181, 189,
  73    197, 206, 214, 222, 230, 239, 247, 255
  74 };
  75 #endif
  76
  77 /* lookup table for scaling 6 bit colors up to 8 bits */
  78 static int _rgb_scale_6[64] = {
  79    0,   4,   8,   12,  16,  20,  24,  28,
  80    32,  36,  40,  45,  49,  53,  57,  61,
  81    65,  69,  73,  77,  81,  85,  89,  93,
  82    97,  101, 105, 109, 113, 117, 121, 125,
  83    130, 134, 138, 142, 146, 150, 154, 158,
  84    162, 166, 170, 174, 178, 182, 186, 190,
  85    194, 198, 202, 206, 210, 215, 219, 223,
  86    227, 231, 235, 239, 243, 247, 251, 255
  87 };
  88
  89 /* FakeColor data */
  90 #define R_CNT 6
  91 #define G_CNT 6
  92 #define B_CNT 6
  93
  94 #define R_BIAS 7
  95 #define G_BIAS 7
  96 #define B_BIAS 7
  97
  98 static word32 VGAPalette[256];
  99 static word8 array_r[256];
 100 static word8 array_g[256];
 101 static word8 array_b[256];
 102
 103
 104
 105 int (*vl_mixfix) (fixed r, fixed g, fixed b);
 106 int (*vl_mixrgb) (const unsigned char rgb[]);
 107 int (*vl_mixrgba) (const unsigned char rgba[]);
 108 void (*vl_getrgba) (unsigned int offset, unsigned char rgba[4]);
 109 int (*vl_getpixel) (unsigned int offset);
 110 void (*vl_clear) (int color);
 111 void (*vl_rect) (int x, int y, int width, int height, int color);
 112 void (*vl_flip) (void);
 113 void (*vl_putpixel) (unsigned int offset, int color);
 114
 115
 116
 117 /* Desc: color composition (w/o ALPHA)
 118  *
 119  * In  : R, G, B
 120  * Out : color
 121  *
 122  * Note: -
 123  */
 124 static int vl_mixfix8fake (fixed r, fixed g, fixed b)
 125 {
 126  return array_b[b>>FIXED_SHIFT]*G_CNT*R_CNT
 127       + array_g[g>>FIXED_SHIFT]*R_CNT
 128       + array_r[r>>FIXED_SHIFT];
 129 }
 130 #define vl_mixfix8 vl_mixfix8fake
 131 static int vl_mixfix15 (fixed r, fixed g, fixed b)
 132 {
 133  return ((r>>(3+FIXED_SHIFT))<<10)
 134        |((g>>(3+FIXED_SHIFT))<<5)
 135        |(b>>(3+FIXED_SHIFT));
 136 }
 137 static int vl_mixfix16 (fixed r, fixed g, fixed b)
 138 {
 139  return ((r>>(3+FIXED_SHIFT))<<11)
 140        |((g>>(2+FIXED_SHIFT))<<5)
 141        |(b>>(3+FIXED_SHIFT));
 142 }
 143 #define vl_mixfix24 vl_mixfix32
 144 static int vl_mixfix32 (fixed r, fixed g, fixed b)
 145 {
 146  return ((r>>FIXED_SHIFT)<<16)
 147        |((g>>FIXED_SHIFT)<<8)
 148        |(b>>FIXED_SHIFT);
 149 }
 150
 151
 152
 153 /* Desc: color composition (w/ ALPHA)
 154  *
 155  * In  : array of integers (R, G, B, A)
 156  * Out : color
 157  *
 158  * Note: -
 159  */
 160 #define vl_mixrgba8 vl_mixrgb8fake
 161 #define vl_mixrgba15 vl_mixrgb15
 162 #define vl_mixrgba16 vl_mixrgb16
 163 #define vl_mixrgba24 vl_mixrgb24
 164 static int vl_mixrgba32 (const unsigned char rgba[])
 165 {
 166  /* Hack alert:
 167   * currently, DMesa uses Mesa's alpha buffer;
 168   * so we don't really care about alpha value here...
 169   */
 170  return /*(rgba[3]<<24)|*/(rgba[0]<<16)|(rgba[1]<<8)|(rgba[2]);
 171 }
 172
 173
 174
 175 /* Desc: color composition (w/o ALPHA)
 176  *
 177  * In  : array of integers (R, G, B)
 178  * Out : color
 179  *
 180  * Note: -
 181  */
 182 static int vl_mixrgb8fake (const unsigned char rgb[])
 183 {
 184  return array_b[rgb[2]]*G_CNT*R_CNT
 185       + array_g[rgb[1]]*R_CNT
 186       + array_r[rgb[0]];
 187 }
 188 #define vl_mixrgb8 vl_mixrgb8fake
 189 static int vl_mixrgb15 (const unsigned char rgb[])
 190 {
 191  return ((rgb[0]>>3)<<10)|((rgb[1]>>3)<<5)|(rgb[2]>>3);
 192 }
 193 static int vl_mixrgb16 (const unsigned char rgb[])
 194 {
 195  return ((rgb[0]>>3)<<11)|((rgb[1]>>2)<<5)|(rgb[2]>>3);
 196 }
 197 #define vl_mixrgb24 vl_mixrgb32
 198 static int vl_mixrgb32 (const unsigned char rgb[])
 199 {
 200  return (rgb[0]<<16)|(rgb[1]<<8)|(rgb[2]);
 201 }
 202
 203
 204
 205 /* Desc: color decomposition
 206  *
 207  * In  : pixel offset, array of integers to hold color components (R, G, B, A)
 208  * Out : -
 209  *
 210  * Note: uses current read buffer
 211  */
 212 static void v_getrgba8fake6 (unsigned int offset, unsigned char rgba[4])
 213 {
 214  word32 c = VGAPalette[((word8 *)vl_current_read_buffer)[offset]];
 215  rgba[0] = _rgb_scale_6[(c >> 16) & 0x3F];
 216  rgba[1] = _rgb_scale_6[(c >> 8) & 0x3F];
 217  rgba[2] = _rgb_scale_6[c & 0x3F];
 218  /*rgba[3] = c >> 24;*/ /* dummy alpha; we have separate SW alpha, so ignore */
 219 }
 220 static void v_getrgba8fake8 (unsigned int offset, unsigned char rgba[4])
 221 {
 222  word32 c = VGAPalette[((word8 *)vl_current_read_buffer)[offset]];
 223  rgba[0] = c >> 16;
 224  rgba[1] = c >> 8;
 225  rgba[2] = c;
 226  /*rgba[3] = c >> 24;*/ /* dummy alpha; we have separate SW alpha, so ignore */
 227 }
 228 #define v_getrgba8 v_getrgba8fake6
 229 static void v_getrgba15 (unsigned int offset, unsigned char rgba[4])
 230 {
 231  word32 c = ((word16 *)vl_current_read_buffer)[offset];
 232 #if HUGE_LOOKUP
 233  c &= 0x7fff;
 234  rgba[0] = pix15r[c];
 235  rgba[1] = pix15g[c];
 236  rgba[2] = pix15b[c];
 237 #else
 238  rgba[0] = _rgb_scale_5[(c >> 10) & 0x1F];
 239  rgba[1] = _rgb_scale_5[(c >> 5) & 0x1F];
 240  rgba[2] = _rgb_scale_5[c & 0x1F];
 241 #endif
 242  /*rgba[3] = 255;*/ /* dummy alpha; we have separate SW alpha, so ignore */
 243 }
 244 static void v_getrgba16 (unsigned int offset, unsigned char rgba[4])
 245 {
 246  word32 c = ((word16 *)vl_current_read_buffer)[offset];
 247 #if HUGE_LOOKUP
 248  rgba[0] = pix16r[c];
 249  rgba[1] = pix16g[c];
 250  rgba[2] = pix16b[c];
 251 #else
 252  rgba[0] = _rgb_scale_5[(c >> 11) & 0x1F];
 253  rgba[1] = _rgb_scale_6[(c >> 5) & 0x3F];
 254  rgba[2] = _rgb_scale_5[c & 0x1F];
 255 #endif
 256  /*rgba[3] = 255;*/ /* dummy alpha; we have separate SW alpha, so ignore */
 257 }
 258 static void v_getrgba24 (unsigned int offset, unsigned char rgba[4])
 259 {
 260  word32 c = *(word32 *)((long)vl_current_read_buffer+offset*3);
 261  rgba[0] = c >> 16;
 262  rgba[1] = c >> 8;
 263  rgba[2] = c;
 264  /*rgba[3] = 255;*/ /* dummy alpha; we have separate SW alpha, so ignore */
 265 }
 266 static void v_getrgba32 (unsigned int offset, unsigned char rgba[4])
 267 {
 268  word32 c = ((word32 *)vl_current_read_buffer)[offset];
 269  rgba[0] = c >> 16;
 270  rgba[1] = c >> 8;
 271  rgba[2] = c;
 272  /*rgba[3] = c >> 24;*/ /* dummy alpha; we have separate SW alpha, so ignore */
 273 }
 274
 275
 276
 277 /* Desc: pixel retrieval
 278  *
 279  * In  : pixel offset
 280  * Out : pixel value
 281  *
 282  * Note: uses current read buffer
 283  */
 284 static int v_getpixel8 (unsigned int offset)
 285 {
 286  return ((word8 *)vl_current_read_buffer)[offset];
 287 }
 288 #define v_getpixel15 v_getpixel16
 289 static int v_getpixel16 (unsigned int offset)
 290 {
 291  return ((word16 *)vl_current_read_buffer)[offset];
 292 }
 293 static int v_getpixel24 (unsigned int offset)
 294 {
 295  return *(word32 *)((long)vl_current_read_buffer+offset*3);
 296 }
 297 static int v_getpixel32 (unsigned int offset)
 298 {
 299  return ((word32 *)vl_current_read_buffer)[offset];
 300 }
 301
 302
 303
 304 /* Desc: set one palette entry
 305  *
 306  * In  : index, R, G, B
 307  * Out : -
 308  *
 309  * Note: color components are in range [0.0 .. 1.0]
 310  */
 311 void vl_setCI (int index, float red, float green, float blue)
 312 {
 313  drv->setCI_f(index, red, green, blue);
 314 }
 315
 316
 317
 318 /* Desc: set one palette entry
 319  *
 320  * In  : color, R, G, B
 321  * Out : -
 322  *
 323  * Note: -
 324  */
 325 static void fake_setcolor (int c, int r, int g, int b)
 326 {
 327  VGAPalette[c] = 0xff000000 | (r<<16) | (g<<8) | b;
 328
 329  drv->setCI_i(c, r, g, b);
 330 }
 331
 332
 333
 334 /* Desc: build FakeColor palette
 335  *
 336  * In  : CI precision in bits
 337  * Out : -
 338  *
 339  * Note: -
 340  */
 341 static void fake_buildpalette (int bits)
 342 {
 343  double c_r, c_g, c_b;
 344  int r, g, b, color = 0;
 345
 346  double max = (1 << bits) - 1;
 347
 348  for (b=0; b<B_CNT; ++b) {
 349      for (g=0; g<G_CNT; ++g) {
 350          for (r=0; r<R_CNT; ++r) {
 351              c_r = 0.5 + (double)r*(max-R_BIAS)/(R_CNT-1.) + R_BIAS;
 352              c_g = 0.5 + (double)g*(max-G_BIAS)/(G_CNT-1.) + G_BIAS;
 353              c_b = 0.5 + (double)b*(max-B_BIAS)/(B_CNT-1.) + B_BIAS;
 354              fake_setcolor(color++, (int)c_r, (int)c_g, (int)c_b);
 355          }
 356      }
 357  }
 358
 359  for (color=0; color<256; color++) {
 360      c_r = (double)color*R_CNT/256.;
 361      c_g = (double)color*G_CNT/256.;
 362      c_b = (double)color*B_CNT/256.;
 363      array_r[color] = (int)c_r;
 364      array_g[color] = (int)c_g;
 365      array_b[color] = (int)c_b;
 366  }
 367 }
 368
 369
 370
 371 #if HUGE_LOOKUP
 372 /* Desc: initialize lookup arrays
 373  *
 374  * In  : -
 375  * Out : -
 376  *
 377  * Note: -
 378  */
 379 void v_init_pixeltables (void)
 380 {
 381  unsigned int pixel;
 382
 383  for (pixel = 0; pixel <= 0xffff; pixel++) {
 384      unsigned int r, g, b;
 385
 386      if (pixel <= 0x7fff) {
 387         /* 15bit */
 388         r = (pixel & 0x7c00) >> 8;
 389         g = (pixel & 0x03E0) >> 3;
 390         b = (pixel & 0x001F) << 2;
 391
 392         r = (unsigned int)(((double)r * 255. / 0x7c) + 0.5);
 393         g = (unsigned int)(((double)g * 255. / 0x7c) + 0.5);
 394         b = (unsigned int)(((double)b * 255. / 0x7c) + 0.5);
 395
 396         pix15r[pixel] = r;
 397         pix15g[pixel] = g;
 398         pix15b[pixel] = b;
 399      }
 400
 401      /* 16bit */
 402      r = (pixel & 0xF800) >> 8;
 403      g = (pixel & 0x07E0) >> 3;
 404      b = (pixel & 0x001F) << 3;
 405
 406      r = (unsigned int)(((double)r * 255. / 0xF8) + 0.5);
 407      g = (unsigned int)(((double)g * 255. / 0xFC) + 0.5);
 408      b = (unsigned int)(((double)b * 255. / 0xF8) + 0.5);
 409
 410      pix16r[pixel] = r;
 411      pix16g[pixel] = g;
 412      pix16b[pixel] = b;
 413  }
 414 }
 415 #endif
 416
 417
 418
 419 /* Desc: initialize hardware
 420  *
 421  * In  : -
 422  * Out : list of available modes
 423  *
 424  * Note: when returning non-NULL, global variable `drv' is guaranteed to be ok
 425  */
 426 static vl_mode *v_init_hw (void)
 427 {
 428  static vl_mode *q = NULL;
 429
 430  if (q == NULL) {
 431     /* initialize hardware */
 432     if ((q = VESA.init()) != NULL) {
 433        drv = &VESA;
 434     } else if ((q = VGA.init()) != NULL) {
 435        drv = &VGA;
 436     } else {
 437        drv = NULL;
 438     }
 439  }
 440
 441  return q;
 442 }
 443
 444
 445
 446 /* Desc: sync buffer with video hardware
 447  *
 448  * In  : ptr to old buffer, position, size
 449  * Out : 0 if success
 450  *
 451  * Note: -
 452  */
 453 int vl_sync_buffer (void **buffer, int x, int y, int width, int height)
 454 {
 455  if ((width & 7) || (x < 0) || (y < 0) || (x+width > video_mode->xres) || (y+height > video_mode->yres)) {
 456     return -1;
 457  } else {
 458     void *newbuf = *buffer;
 459
 460     if ((newbuf == NULL) || (vl_current_width != width) || (vl_current_height != height)) {
 461        newbuf = realloc(newbuf, width * height * video_bypp);
 462     }
 463
 464     if (newbuf == NULL) {
 465        return -2;
 466     }
 467
 468     vl_current_width = width;
 469     vl_current_height = height;
 470     vl_current_stride = vl_current_width * video_bypp;
 471     vl_current_bytes = vl_current_stride * height;
 472
 473     vl_current_offset = video_scanlen * y + video_bypp * x;
 474     vl_current_delta = video_scanlen - vl_current_stride;
 475
 476     vl_current_draw_buffer = vl_current_read_buffer = *buffer = newbuf;
 477     return 0;
 478  }
 479 }
 480
 481
 482
 483 /* Desc: state retrieval
 484  *
 485  * In  : name, storage
 486  * Out : -1 for an error
 487  *
 488  * Note: -
 489  */
 490 int vl_get (int pname, int *params)
 491 {
 492  switch (pname) {
 493         case VL_GET_SCREEN_SIZE:
 494              params[0] = video_mode->xres;
 495              params[1] = video_mode->yres;
 496              break;
 497         case VL_GET_VIDEO_MODES:
 498              {
 499               int n;
 500               vl_mode *q;
 501               if ((q = v_init_hw()) == NULL) {
 502                  return -1;
 503               }
 504               /* count available visuals */
 505               for (n = 0; q->mode != 0xffff; q++) {
 506                   if ((q + 1)->mode == (q->mode | 0x4000)) {
 507                      /* same mode, but linear */
 508                      q++;
 509                   }
 510                   if (params) {
 511                      params[n] = (int)q;
 512                   }
 513                   n++;
 514               }
 515               return n;
 516              }
 517         default:
 518              return (drv != NULL) ? drv->get(pname, params) : -1;
 519  }
 520  return 0;
 521 }
 522
 523
 524
 525 /* Desc: setup mode
 526  *
 527  * In  : ptr to mode definition
 528  * Out : 0 if success
 529  *
 530  * Note: -
 531  */
 532 static int vl_setup_mode (vl_mode *p)
 533 {
 534  if (p == NULL) {
 535     return -1;
 536  }
 537
 538 #define INITPTR(bpp) \
 539         vl_putpixel = v_putpixel##bpp; \
 540         vl_getrgba = v_getrgba##bpp;   \
 541         vl_getpixel = v_getpixel##bpp; \
 542         vl_rect = v_rect##bpp;         \
 543         vl_mixfix = vl_mixfix##bpp;    \
 544         vl_mixrgb = vl_mixrgb##bpp;    \
 545         vl_mixrgba = vl_mixrgba##bpp;  \
 546         vl_clear = _can_mmx() ? v_clear##bpp##_mmx : v_clear##bpp
 547
 548  switch (p->bpp) {
 549         case 8:
 550              INITPTR(8);
 551              break;
 552         case 15:
 553              INITPTR(15);
 554              break;
 555         case 16:
 556              INITPTR(16);
 557              break;
 558         case 24:
 559              INITPTR(24);
 560              break;
 561         case 32:
 562              INITPTR(32);
 563              break;
 564         default:
 565              return -1;
 566  }
 567
 568 #undef INITPTR
 569
 570  video_mode = p;
 571  video_bypp = (p->bpp+7)/8;
 572  video_scanlen = p->scanlen;
 573  vl_video_selector = p->sel;
 574
 575  return 0;
 576 }
 577
 578
 579
 580 /* Desc: restore to the mode prior to first call to `vl_video_init'.
 581  *
 582  * In  : -
 583  * Out : -
 584  *
 585  * Note: -
 586  */
 587 void vl_video_exit (void)
 588 {
 589  drv->restore();
 590  drv->fini();
 591  video_mode = NULL;
 592 }
 593
 594
 595
 596 /* Desc: enter mode
 597  *
 598  * In  : xres, yres, bits/pixel, RGB, refresh rate
 599  * Out : pixel width in bits if success
 600  *
 601  * Note: -
 602  */
 603 int vl_video_init (int width, int height, int bpp, int rgb, int refresh)
 604 {
 605  int fake;
 606  vl_mode *p, *q;
 607  unsigned int min;
 608
 609  fake = 0;
 610  if (!rgb) {
 611     bpp = 8;
 612  } else if (bpp == 8) {
 613     fake = 1;
 614  }
 615 #if HUGE_LOOKUP
 616  else if (bpp < 24) {
 617     v_init_pixeltables();
 618  }
 619 #endif
 620
 621  /* initialize hardware */
 622  if ((q = v_init_hw()) == NULL) {
 623     return 0;
 624  }
 625
 626  /* search for a mode that fits our request */
 627  for (min=-1, p=NULL; q->mode!=0xffff; q++) {
 628      if ((q->xres>=width) && (q->yres>=height) && (q->bpp==bpp)) {
 629         if (min>=(unsigned)(q->xres*q->yres)) {
 630            min = q->xres*q->yres;
 631            p = q;
 632         }
 633      }
 634  }
 635
 636  /* setup and enter mode */
 637  if ((vl_setup_mode(p) == 0) && (drv->entermode(p, refresh) == 0)) {
 638     vl_flip = drv->blit;
 639     if (fake) {
 640        drv->get(VL_GET_CI_PREC, (int *)(&min));
 641        fake_buildpalette(min);
 642        if (min == 8) {
 643           vl_getrgba = v_getrgba8fake8;
 644        }
 645     }
 646     return bpp;
 647  }
 648
 649  /* abort */
 650  return 0;
 651 }