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 v1.3 for Mesa
  27  *
  28  *  Copyright (C) 2002 - Borca Daniel
  29  *  Email : dborca@yahoo.com
  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[0x10000];
  62 static unsigned char pix15g[0x10000];
  63 static unsigned char pix15b[0x10000];
  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  return (rgba[3]<<24)|(rgba[0]<<16)|(rgba[1]<<8)|(rgba[2]);
 167 }
 168
 169
 170
 171 /* Desc: color composition (w/o ALPHA)
 172  *
 173  * In  : array of integers (R, G, B)
 174  * Out : color
 175  *
 176  * Note: -
 177  */
 178 static int vl_mixrgb8fake (const unsigned char rgba[])
 179 {
 180  return array_b[rgba[2]]*G_CNT*R_CNT
 181       + array_g[rgba[1]]*R_CNT
 182       + array_r[rgba[0]];
 183 }
 184 #define vl_mixrgb8 vl_mixrgb8fake
 185 static int vl_mixrgb15 (const unsigned char rgb[])
 186 {
 187  return ((rgb[0]>>3)<<10)|((rgb[1]>>3)<<5)|(rgb[2]>>3);
 188 }
 189 static int vl_mixrgb16 (const unsigned char rgb[])
 190 {
 191  return ((rgb[0]>>3)<<11)|((rgb[1]>>2)<<5)|(rgb[2]>>3);
 192 }
 193 #define vl_mixrgb24 vl_mixrgb32
 194 static int vl_mixrgb32 (const unsigned char rgb[])
 195 {
 196  return (rgb[0]<<16)|(rgb[1]<<8)|(rgb[2]);
 197 }
 198
 199
 200
 201 /* Desc: color decomposition
 202  *
 203  * In  : pixel offset, array of integers to hold color components (R, G, B, A)
 204  * Out : -
 205  *
 206  * Note: uses current read buffer
 207  */
 208 static void v_getrgba8fake6 (unsigned int offset, unsigned char rgba[])
 209 {
 210  word32 c = VGAPalette[((word8 *)vl_current_read_buffer)[offset]];
 211  rgba[0] = _rgb_scale_6[(c >> 16) & 0x3F];
 212  rgba[1] = _rgb_scale_6[(c >> 8) & 0x3F];
 213  rgba[2] = _rgb_scale_6[c & 0x3F];
 214  rgba[3] = c >> 24;
 215 }
 216 static void v_getrgba8fake8 (unsigned int offset, unsigned char rgba[])
 217 {
 218  word32 c = VGAPalette[((word8 *)vl_current_read_buffer)[offset]];
 219  rgba[0] = c >> 16;
 220  rgba[1] = c >> 8;
 221  rgba[2] = c;
 222  rgba[3] = c >> 24;
 223 }
 224 #define v_getrgba8 v_getrgba8fake6
 225 static void v_getrgba15 (unsigned int offset, unsigned char rgba[4])
 226 {
 227  word32 c = ((word16 *)vl_current_read_buffer)[offset];
 228 #if HUGE_LOOKUP
 229  rgba[0] = pix15r[c];
 230  rgba[1] = pix15g[c];
 231  rgba[2] = pix15b[c];
 232 #else
 233  rgba[0] = _rgb_scale_5[(c >> 10) & 0x1F];
 234  rgba[1] = _rgb_scale_5[(c >> 5) & 0x1F];
 235  rgba[2] = _rgb_scale_5[c & 0x1F];
 236 #endif
 237  rgba[3] = 255;
 238 }
 239 static void v_getrgba16 (unsigned int offset, unsigned char rgba[4])
 240 {
 241  word32 c = ((word16 *)vl_current_read_buffer)[offset];
 242 #if HUGE_LOOKUP
 243  rgba[0] = pix16r[c];
 244  rgba[1] = pix16g[c];
 245  rgba[2] = pix16b[c];
 246 #else
 247  rgba[0] = _rgb_scale_5[(c >> 11) & 0x1F];
 248  rgba[1] = _rgb_scale_6[(c >> 5) & 0x3F];
 249  rgba[2] = _rgb_scale_5[c & 0x1F];
 250 #endif
 251  rgba[3] = 255;
 252 }
 253 static void v_getrgba24 (unsigned int offset, unsigned char rgba[4])
 254 {
 255  word32 c = *(word32 *)((long)vl_current_read_buffer+offset*3);
 256  rgba[0] = c >> 16;
 257  rgba[1] = c >> 8;
 258  rgba[2] = c;
 259  rgba[3] = 255;
 260 }
 261 static void v_getrgba32 (unsigned int offset, unsigned char rgba[4])
 262 {
 263  word32 c = ((word32 *)vl_current_read_buffer)[offset];
 264  rgba[0] = c >> 16;
 265  rgba[1] = c >> 8;
 266  rgba[2] = c;
 267  rgba[3] = c >> 24;
 268 }
 269
 270
 271
 272 /* Desc: pixel retrieval
 273  *
 274  * In  : pixel offset
 275  * Out : pixel value
 276  *
 277  * Note: uses current read buffer
 278  */
 279 static int v_getpixel8 (unsigned int offset)
 280 {
 281  return ((word8 *)vl_current_read_buffer)[offset];
 282 }
 283 #define v_getpixel15 v_getpixel16
 284 static int v_getpixel16 (unsigned int offset)
 285 {
 286  return ((word16 *)vl_current_read_buffer)[offset];
 287 }
 288 static int v_getpixel24 (unsigned int offset)
 289 {
 290  return *(word32 *)((long)vl_current_read_buffer+offset*3);
 291 }
 292 static int v_getpixel32 (unsigned int offset)
 293 {
 294  return ((word32 *)vl_current_read_buffer)[offset];
 295 }
 296
 297
 298
 299 /* Desc: set one palette entry
 300  *
 301  * In  : index, R, G, B
 302  * Out : -
 303  *
 304  * Note: color components are in range [0.0 .. 1.0]
 305  */
 306 void vl_setCI (int index, float red, float green, float blue)
 307 {
 308  drv->setCI_f(index, red, green, blue);
 309 }
 310
 311
 312
 313 /* Desc: set one palette entry
 314  *
 315  * In  : color, R, G, B
 316  * Out : -
 317  *
 318  * Note: -
 319  */
 320 static void fake_setcolor (int c, int r, int g, int b)
 321 {
 322  VGAPalette[c] = 0xff000000 | (r<<16) | (g<<8) | b;
 323
 324  drv->setCI_i(c, r, g, b);
 325 }
 326
 327
 328
 329 /* Desc: build FakeColor palette
 330  *
 331  * In  : CI precision in bits
 332  * Out : -
 333  *
 334  * Note: -
 335  */
 336 static void fake_buildpalette (int bits)
 337 {
 338  double c_r, c_g, c_b;
 339  int r, g, b, color = 0;
 340
 341  double max = (1 << bits) - 1;
 342
 343  for (b=0; b<B_CNT; ++b) {
 344      for (g=0; g<G_CNT; ++g) {
 345          for (r=0; r<R_CNT; ++r) {
 346              c_r = 0.5 + (double)r*(max-R_BIAS)/(R_CNT-1.) + R_BIAS;
 347              c_g = 0.5 + (double)g*(max-G_BIAS)/(G_CNT-1.) + G_BIAS;
 348              c_b = 0.5 + (double)b*(max-B_BIAS)/(B_CNT-1.) + B_BIAS;
 349              fake_setcolor(color++, (int)c_r, (int)c_g, (int)c_b);
 350          }
 351      }
 352  }
 353
 354  for (color=0; color<256; color++) {
 355      c_r = (double)color*R_CNT/256.;
 356      c_g = (double)color*G_CNT/256.;
 357      c_b = (double)color*B_CNT/256.;
 358      array_r[color] = (int)c_r;
 359      array_g[color] = (int)c_g;
 360      array_b[color] = (int)c_b;
 361  }
 362 }
 363
 364
 365
 366 #if HUGE_LOOKUP
 367 /* Desc: initialize lookup arrays
 368  *
 369  * In  : -
 370  * Out : -
 371  *
 372  * Note: -
 373  */
 374 void v_init_pixeltables (void)
 375 {
 376  unsigned int pixel;
 377
 378  for (pixel = 0; pixel <= 0xffff; pixel++) {
 379      unsigned int r, g, b;
 380
 381      /* 15bit */
 382      r = (pixel & 0x7c00) >> 8;
 383      g = (pixel & 0x03E0) >> 3;
 384      b = (pixel & 0x001F) << 2;
 385
 386      r = (unsigned int)(((double)r * 255. / 0x7c) + 0.5);
 387      g = (unsigned int)(((double)g * 255. / 0x7c) + 0.5);
 388      b = (unsigned int)(((double)b * 255. / 0x7c) + 0.5);
 389
 390      pix15r[pixel] = r;
 391      pix15g[pixel] = g;
 392      pix15b[pixel] = b;
 393
 394      /* 16bit */
 395      r = (pixel & 0xF800) >> 8;
 396      g = (pixel & 0x07E0) >> 3;
 397      b = (pixel & 0x001F) << 3;
 398
 399      r = (unsigned int)(((double)r * 255. / 0xF8) + 0.5);
 400      g = (unsigned int)(((double)g * 255. / 0xFC) + 0.5);
 401      b = (unsigned int)(((double)b * 255. / 0xF8) + 0.5);
 402
 403      pix16r[pixel] = r;
 404      pix16g[pixel] = g;
 405      pix16b[pixel] = b;
 406  }
 407 }
 408 #endif
 409
 410
 411
 412 /* Desc: sync buffer with video hardware
 413  *
 414  * In  : ptr to old buffer, position, size
 415  * Out : 0 if success
 416  *
 417  * Note: -
 418  */
 419 int vl_sync_buffer (void **buffer, int x, int y, int width, int height)
 420 {
 421  if ((width & 7) || (x < 0) || (y < 0) || (x+width > video_mode->xres) || (y+height > video_mode->yres)) {
 422     return -1;
 423  } else {
 424     void *newbuf = *buffer;
 425
 426     if ((newbuf == NULL) || (vl_current_width != width) || (vl_current_height != height)) {
 427        newbuf = realloc(newbuf, width * height * video_bypp);
 428     }
 429
 430     if (newbuf == NULL) {
 431        return -2;
 432     }
 433
 434     vl_current_width = width;
 435     vl_current_height = height;
 436     vl_current_stride = vl_current_width * video_bypp;
 437     vl_current_bytes = vl_current_stride * height;
 438
 439     vl_current_offset = video_scanlen * y + video_bypp * x;
 440     vl_current_delta = video_scanlen - vl_current_stride;
 441
 442     vl_current_draw_buffer = vl_current_read_buffer = *buffer = newbuf;
 443     return 0;
 444  }
 445 }
 446
 447
 448
 449 /* Desc: state retrieval
 450  *
 451  * In  : name, storage
 452  * Out : -
 453  *
 454  * Note: -
 455  */
 456 int vl_get (int pname, int *params)
 457 {
 458  switch (pname) {
 459         case VL_GET_SCREEN_SIZE:
 460              params[0] = video_mode->xres;
 461              params[1] = video_mode->yres;
 462              break;
 463         default:
 464              return drv->get(pname, params);
 465  }
 466  return 0;
 467 }
 468
 469
 470
 471 /* Desc: setup mode
 472  *
 473  * In  : ptr to mode definition
 474  * Out : 0 if success
 475  *
 476  * Note: -
 477  */
 478 static int vl_setup_mode (vl_mode *p)
 479 {
 480  if (p == NULL) {
 481     return -1;
 482  }
 483
 484 #define INITPTR(bpp) \
 485         vl_putpixel = v_putpixel##bpp; \
 486         vl_getrgba = v_getrgba##bpp;   \
 487         vl_getpixel = v_getpixel##bpp; \
 488         vl_rect = v_rect##bpp;         \
 489         vl_mixfix = vl_mixfix##bpp;    \
 490         vl_mixrgb = vl_mixrgb##bpp;    \
 491         vl_mixrgba = vl_mixrgba##bpp;  \
 492         vl_clear = _can_mmx() ? v_clear##bpp##_mmx : v_clear##bpp
 493
 494  switch (p->bpp) {
 495         case 8:
 496              INITPTR(8);
 497              break;
 498         case 15:
 499              INITPTR(15);
 500              break;
 501         case 16:
 502              INITPTR(16);
 503              break;
 504         case 24:
 505              INITPTR(24);
 506              break;
 507         case 32:
 508              INITPTR(32);
 509              break;
 510         default:
 511              return -1;
 512  }
 513
 514 #undef INITPTR
 515
 516  video_mode = p;
 517  video_bypp = (p->bpp+7)/8;
 518  video_scanlen = p->scanlen;
 519  vl_video_selector = p->sel;
 520
 521  return 0;
 522 }
 523
 524
 525
 526 /* Desc: restore to the mode prior to first call to `vl_video_init'.
 527  *
 528  * In  : -
 529  * Out : -
 530  *
 531  * Note: -
 532  */
 533 void vl_video_exit (void)
 534 {
 535  drv->restore();
 536  drv->fini();
 537 }
 538
 539
 540
 541 /* Desc: enter mode
 542  *
 543  * In  : xres, yres, bits/pixel, RGB, refresh rate
 544  * Out : pixel width in bits if success
 545  *
 546  * Note: -
 547  */
 548 int vl_video_init (int width, int height, int bpp, int rgb, int refresh)
 549 {
 550  int fake;
 551  vl_mode *p, *q;
 552  unsigned int min;
 553
 554  fake = 0;
 555  if (!rgb) {
 556     bpp = 8;
 557  } else if (bpp == 8) {
 558     fake = 1;
 559  }
 560 #if HUGE_LOOKUP
 561  else if (bpp < 24) {
 562     v_init_pixeltables();
 563  }
 564 #endif
 565
 566  /* initialize hardware */
 567  drv = &VESA;
 568  if ((q=drv->init()) == NULL) {
 569     drv = &VGA;
 570     if ((q=drv->init()) == NULL) {
 571        return 0;
 572     }
 573  }
 574
 575  /* search for a mode that fits our request */
 576  for (min=-1, p=NULL; q->mode!=0xffff; q++) {
 577      if ((q->xres>=width) && (q->yres>=height) && (q->bpp==bpp)) {
 578         if (min>=(unsigned)(q->xres*q->yres)) {
 579            min = q->xres*q->yres;
 580            p = q;
 581         }
 582      }
 583  }
 584
 585  /* setup and enter mode */
 586  if ((vl_setup_mode(p) == 0) && (drv->entermode(p, refresh) == 0)) {
 587     vl_flip = drv->blit;
 588     if (fake) {
 589        drv->get(VL_GET_CI_PREC, (int *)(&min));
 590        fake_buildpalette(min);
 591        if (min == 8) {
 592           vl_getrgba = v_getrgba8fake8;
 593        }
 594     }
 595     return bpp;
 596  }
 597
 598  /* abort */
 599  return 0;
 600 }