src/mesa/main/pixel.c

   1 /* $Id: pixel.c,v 1.30 2001/07/13 20:07:37 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "colormac.h"
  33 #include "context.h"
  34 #include "macros.h"
  35 #include "mem.h"
  36 #include "pixel.h"
  37 #include "mtypes.h"
  38 #endif
  39
  40
  41
  42 /**********************************************************************/
  43 /*****                    glPixelZoom                             *****/
  44 /**********************************************************************/
  45
  46
  47
  48 void
  49 _mesa_PixelZoom( GLfloat xfactor, GLfloat yfactor )
  50 {
  51    GET_CURRENT_CONTEXT(ctx);
  52
  53    if (ctx->Pixel.ZoomX == xfactor &&
  54        ctx->Pixel.ZoomY == yfactor)
  55       return;
  56
  57    FLUSH_VERTICES(ctx, _NEW_PIXEL);
  58    ctx->Pixel.ZoomX = xfactor;
  59    ctx->Pixel.ZoomY = yfactor;
  60 }
  61
  62
  63
  64 /**********************************************************************/
  65 /*****                    glPixelStore                            *****/
  66 /**********************************************************************/
  67
  68
  69 void
  70 _mesa_PixelStorei( GLenum pname, GLint param )
  71 {
  72    /* NOTE: this call can't be compiled into the display list */
  73    GET_CURRENT_CONTEXT(ctx);
  74    ASSERT_OUTSIDE_BEGIN_END(ctx);
  75
  76    switch (pname) {
  77       case GL_PACK_SWAP_BYTES:
  78          if (param == (GLint)ctx->Pack.SwapBytes)
  79             return;
  80          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  81          ctx->Pack.SwapBytes = param ? GL_TRUE : GL_FALSE;
  82          break;
  83       case GL_PACK_LSB_FIRST:
  84          if (param == (GLint)ctx->Pack.LsbFirst)
  85             return;
  86          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  87          ctx->Pack.LsbFirst = param ? GL_TRUE : GL_FALSE;
  88          break;
  89       case GL_PACK_ROW_LENGTH:
  90          if (param<0) {
  91             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
  92             return;
  93          }
  94          if (ctx->Pack.RowLength == param)
  95             return;
  96          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
  97          ctx->Pack.RowLength = param;
  98          break;
  99       case GL_PACK_IMAGE_HEIGHT:
 100          if (param<0) {
 101             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 102             return;
 103          }
 104          if (ctx->Pack.ImageHeight == param)
 105             return;
 106          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 107          ctx->Pack.ImageHeight = param;
 108          break;
 109       case GL_PACK_SKIP_PIXELS:
 110          if (param<0) {
 111             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 112             return;
 113          }
 114          if (ctx->Pack.SkipPixels == param)
 115             return;
 116          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 117          ctx->Pack.SkipPixels = param;
 118          break;
 119       case GL_PACK_SKIP_ROWS:
 120          if (param<0) {
 121             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 122             return;
 123          }
 124          if (ctx->Pack.SkipRows == param)
 125             return;
 126          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 127          ctx->Pack.SkipRows = param;
 128          break;
 129       case GL_PACK_SKIP_IMAGES:
 130          if (param<0) {
 131             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 132             return;
 133          }
 134          if (ctx->Pack.SkipImages == param)
 135             return;
 136          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 137          ctx->Pack.SkipImages = param;
 138          break;
 139       case GL_PACK_ALIGNMENT:
 140          if (param!=1 && param!=2 && param!=4 && param!=8) {
 141             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 142             return;
 143          }
 144          if (ctx->Pack.Alignment == param)
 145             return;
 146          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 147          ctx->Pack.Alignment = param;
 148          break;
 149       case GL_UNPACK_SWAP_BYTES:
 150          if (param == (GLint)ctx->Unpack.SwapBytes)
 151             return;
 152          if ((GLint)ctx->Unpack.SwapBytes == param)
 153             return;
 154          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 155          ctx->Unpack.SwapBytes = param ? GL_TRUE : GL_FALSE;
 156          break;
 157       case GL_UNPACK_LSB_FIRST:
 158          if (param == (GLint)ctx->Unpack.LsbFirst)
 159             return;
 160          if ((GLint)ctx->Unpack.LsbFirst == param)
 161             return;
 162          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 163          ctx->Unpack.LsbFirst = param ? GL_TRUE : GL_FALSE;
 164          break;
 165       case GL_UNPACK_ROW_LENGTH:
 166          if (param<0) {
 167             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 168             return;
 169          }
 170          if (ctx->Unpack.RowLength == param)
 171             return;
 172          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 173          ctx->Unpack.RowLength = param;
 174          break;
 175       case GL_UNPACK_IMAGE_HEIGHT:
 176          if (param<0) {
 177             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 178             return;
 179          }
 180          if (ctx->Unpack.ImageHeight == param)
 181             return;
 182
 183          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 184          ctx->Unpack.ImageHeight = param;
 185          break;
 186       case GL_UNPACK_SKIP_PIXELS:
 187          if (param<0) {
 188             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 189             return;
 190          }
 191          if (ctx->Unpack.SkipPixels == param)
 192             return;
 193          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 194          ctx->Unpack.SkipPixels = param;
 195          break;
 196       case GL_UNPACK_SKIP_ROWS:
 197          if (param<0) {
 198             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 199             return;
 200          }
 201          if (ctx->Unpack.SkipRows == param)
 202             return;
 203          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 204          ctx->Unpack.SkipRows = param;
 205          break;
 206       case GL_UNPACK_SKIP_IMAGES:
 207          if (param < 0) {
 208             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
 209             return;
 210          }
 211          if (ctx->Unpack.SkipImages == param)
 212             return;
 213          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 214          ctx->Unpack.SkipImages = param;
 215          break;
 216       case GL_UNPACK_ALIGNMENT:
 217          if (param!=1 && param!=2 && param!=4 && param!=8) {
 218             _mesa_error( ctx, GL_INVALID_VALUE, "glPixelStore" );
 219             return;
 220          }
 221          if (ctx->Unpack.Alignment == param)
 222             return;
 223          FLUSH_VERTICES(ctx, _NEW_PACKUNPACK);
 224          ctx->Unpack.Alignment = param;
 225          break;
 226       default:
 227          _mesa_error( ctx, GL_INVALID_ENUM, "glPixelStore" );
 228          return;
 229    }
 230 }
 231
 232
 233 void
 234 _mesa_PixelStoref( GLenum pname, GLfloat param )
 235 {
 236    _mesa_PixelStorei( pname, (GLint) param );
 237 }
 238
 239
 240
 241 /**********************************************************************/
 242 /*****                         glPixelMap                         *****/
 243 /**********************************************************************/
 244
 245
 246
 247 void
 248 _mesa_PixelMapfv( GLenum map, GLint mapsize, const GLfloat *values )
 249 {
 250    GLint i;
 251    GET_CURRENT_CONTEXT(ctx);
 252    ASSERT_OUTSIDE_BEGIN_END(ctx);
 253
 254    if (mapsize<0 || mapsize>MAX_PIXEL_MAP_TABLE) {
 255       _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
 256       return;
 257    }
 258
 259    if (map>=GL_PIXEL_MAP_S_TO_S && map<=GL_PIXEL_MAP_I_TO_A) {
 260       /* test that mapsize is a power of two */
 261       GLuint p;
 262       GLboolean ok = GL_FALSE;
 263       for (p=1; p<=MAX_PIXEL_MAP_TABLE; p=p<<1) {
 264          if ( (p&mapsize) == p ) {
 265             ok = GL_TRUE;
 266             break;
 267          }
 268       }
 269       if (!ok) {
 270          _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
 271          return;
 272       }
 273    }
 274
 275    FLUSH_VERTICES(ctx, _NEW_PIXEL);
 276
 277    switch (map) {
 278       case GL_PIXEL_MAP_S_TO_S:
 279          ctx->Pixel.MapStoSsize = mapsize;
 280          for (i=0;i<mapsize;i++) {
 281             ctx->Pixel.MapStoS[i] = (GLint) values[i];
 282          }
 283          break;
 284       case GL_PIXEL_MAP_I_TO_I:
 285          ctx->Pixel.MapItoIsize = mapsize;
 286          for (i=0;i<mapsize;i++) {
 287             ctx->Pixel.MapItoI[i] = (GLint) values[i];
 288          }
 289          break;
 290       case GL_PIXEL_MAP_I_TO_R:
 291          ctx->Pixel.MapItoRsize = mapsize;
 292          for (i=0;i<mapsize;i++) {
 293             GLfloat val = CLAMP( values[i], 0.0, 1.0 );
 294             ctx->Pixel.MapItoR[i] = val;
 295             ctx->Pixel.MapItoR8[i] = (GLint) (val * 255.0F);
 296          }
 297          break;
 298       case GL_PIXEL_MAP_I_TO_G:
 299          ctx->Pixel.MapItoGsize = mapsize;
 300          for (i=0;i<mapsize;i++) {
 301             GLfloat val = CLAMP( values[i], 0.0, 1.0 );
 302             ctx->Pixel.MapItoG[i] = val;
 303             ctx->Pixel.MapItoG8[i] = (GLint) (val * 255.0F);
 304          }
 305          break;
 306       case GL_PIXEL_MAP_I_TO_B:
 307          ctx->Pixel.MapItoBsize = mapsize;
 308          for (i=0;i<mapsize;i++) {
 309             GLfloat val = CLAMP( values[i], 0.0, 1.0 );
 310             ctx->Pixel.MapItoB[i] = val;
 311             ctx->Pixel.MapItoB8[i] = (GLint) (val * 255.0F);
 312          }
 313          break;
 314       case GL_PIXEL_MAP_I_TO_A:
 315          ctx->Pixel.MapItoAsize = mapsize;
 316          for (i=0;i<mapsize;i++) {
 317             GLfloat val = CLAMP( values[i], 0.0, 1.0 );
 318             ctx->Pixel.MapItoA[i] = val;
 319             ctx->Pixel.MapItoA8[i] = (GLint) (val * 255.0F);
 320          }
 321          break;
 322       case GL_PIXEL_MAP_R_TO_R:
 323          ctx->Pixel.MapRtoRsize = mapsize;
 324          for (i=0;i<mapsize;i++) {
 325             ctx->Pixel.MapRtoR[i] = CLAMP( values[i], 0.0, 1.0 );
 326          }
 327          break;
 328       case GL_PIXEL_MAP_G_TO_G:
 329          ctx->Pixel.MapGtoGsize = mapsize;
 330          for (i=0;i<mapsize;i++) {
 331             ctx->Pixel.MapGtoG[i] = CLAMP( values[i], 0.0, 1.0 );
 332          }
 333          break;
 334       case GL_PIXEL_MAP_B_TO_B:
 335          ctx->Pixel.MapBtoBsize = mapsize;
 336          for (i=0;i<mapsize;i++) {
 337             ctx->Pixel.MapBtoB[i] = CLAMP( values[i], 0.0, 1.0 );
 338          }
 339          break;
 340       case GL_PIXEL_MAP_A_TO_A:
 341          ctx->Pixel.MapAtoAsize = mapsize;
 342          for (i=0;i<mapsize;i++) {
 343             ctx->Pixel.MapAtoA[i] = CLAMP( values[i], 0.0, 1.0 );
 344          }
 345          break;
 346       default:
 347          _mesa_error( ctx, GL_INVALID_ENUM, "glPixelMapfv(map)" );
 348    }
 349 }
 350
 351
 352
 353 void
 354 _mesa_PixelMapuiv(GLenum map, GLint mapsize, const GLuint *values )
 355 {
 356    GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
 357    GLint i;
 358    if (map==GL_PIXEL_MAP_I_TO_I || map==GL_PIXEL_MAP_S_TO_S) {
 359       for (i=0;i<mapsize;i++) {
 360          fvalues[i] = (GLfloat) values[i];
 361       }
 362    }
 363    else {
 364       for (i=0;i<mapsize;i++) {
 365          fvalues[i] = UINT_TO_FLOAT( values[i] );
 366       }
 367    }
 368    _mesa_PixelMapfv(map, mapsize, fvalues);
 369 }
 370
 371
 372
 373 void
 374 _mesa_PixelMapusv(GLenum map, GLint mapsize, const GLushort *values )
 375 {
 376    GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
 377    GLint i;
 378    if (map==GL_PIXEL_MAP_I_TO_I || map==GL_PIXEL_MAP_S_TO_S) {
 379       for (i=0;i<mapsize;i++) {
 380          fvalues[i] = (GLfloat) values[i];
 381       }
 382    }
 383    else {
 384       for (i=0;i<mapsize;i++) {
 385          fvalues[i] = USHORT_TO_FLOAT( values[i] );
 386       }
 387    }
 388    _mesa_PixelMapfv(map, mapsize, fvalues);
 389 }
 390
 391
 392
 393 void
 394 _mesa_GetPixelMapfv( GLenum map, GLfloat *values )
 395 {
 396    GET_CURRENT_CONTEXT(ctx);
 397    GLint i;
 398    ASSERT_OUTSIDE_BEGIN_END(ctx);
 399
 400    switch (map) {
 401       case GL_PIXEL_MAP_I_TO_I:
 402          for (i=0;i<ctx->Pixel.MapItoIsize;i++) {
 403             values[i] = (GLfloat) ctx->Pixel.MapItoI[i];
 404          }
 405          break;
 406       case GL_PIXEL_MAP_S_TO_S:
 407          for (i=0;i<ctx->Pixel.MapStoSsize;i++) {
 408             values[i] = (GLfloat) ctx->Pixel.MapStoS[i];
 409          }
 410          break;
 411       case GL_PIXEL_MAP_I_TO_R:
 412          MEMCPY(values,ctx->Pixel.MapItoR,ctx->Pixel.MapItoRsize*sizeof(GLfloat));
 413          break;
 414       case GL_PIXEL_MAP_I_TO_G:
 415          MEMCPY(values,ctx->Pixel.MapItoG,ctx->Pixel.MapItoGsize*sizeof(GLfloat));
 416          break;
 417       case GL_PIXEL_MAP_I_TO_B:
 418          MEMCPY(values,ctx->Pixel.MapItoB,ctx->Pixel.MapItoBsize*sizeof(GLfloat));
 419          break;
 420       case GL_PIXEL_MAP_I_TO_A:
 421          MEMCPY(values,ctx->Pixel.MapItoA,ctx->Pixel.MapItoAsize*sizeof(GLfloat));
 422          break;
 423       case GL_PIXEL_MAP_R_TO_R:
 424          MEMCPY(values,ctx->Pixel.MapRtoR,ctx->Pixel.MapRtoRsize*sizeof(GLfloat));
 425          break;
 426       case GL_PIXEL_MAP_G_TO_G:
 427          MEMCPY(values,ctx->Pixel.MapGtoG,ctx->Pixel.MapGtoGsize*sizeof(GLfloat));
 428          break;
 429       case GL_PIXEL_MAP_B_TO_B:
 430          MEMCPY(values,ctx->Pixel.MapBtoB,ctx->Pixel.MapBtoBsize*sizeof(GLfloat));
 431          break;
 432       case GL_PIXEL_MAP_A_TO_A:
 433          MEMCPY(values,ctx->Pixel.MapAtoA,ctx->Pixel.MapAtoAsize*sizeof(GLfloat));
 434          break;
 435       default:
 436          _mesa_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
 437    }
 438 }
 439
 440
 441 void
 442 _mesa_GetPixelMapuiv( GLenum map, GLuint *values )
 443 {
 444    GET_CURRENT_CONTEXT(ctx);
 445    GLint i;
 446    ASSERT_OUTSIDE_BEGIN_END(ctx);
 447
 448    switch (map) {
 449       case GL_PIXEL_MAP_I_TO_I:
 450          MEMCPY(values, ctx->Pixel.MapItoI, ctx->Pixel.MapItoIsize*sizeof(GLint));
 451          break;
 452       case GL_PIXEL_MAP_S_TO_S:
 453          MEMCPY(values, ctx->Pixel.MapStoS, ctx->Pixel.MapStoSsize*sizeof(GLint));
 454          break;
 455       case GL_PIXEL_MAP_I_TO_R:
 456          for (i=0;i<ctx->Pixel.MapItoRsize;i++) {
 457             values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoR[i] );
 458          }
 459          break;
 460       case GL_PIXEL_MAP_I_TO_G:
 461          for (i=0;i<ctx->Pixel.MapItoGsize;i++) {
 462             values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoG[i] );
 463          }
 464          break;
 465       case GL_PIXEL_MAP_I_TO_B:
 466          for (i=0;i<ctx->Pixel.MapItoBsize;i++) {
 467             values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoB[i] );
 468          }
 469          break;
 470       case GL_PIXEL_MAP_I_TO_A:
 471          for (i=0;i<ctx->Pixel.MapItoAsize;i++) {
 472             values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoA[i] );
 473          }
 474          break;
 475       case GL_PIXEL_MAP_R_TO_R:
 476          for (i=0;i<ctx->Pixel.MapRtoRsize;i++) {
 477             values[i] = FLOAT_TO_UINT( ctx->Pixel.MapRtoR[i] );
 478          }
 479          break;
 480       case GL_PIXEL_MAP_G_TO_G:
 481          for (i=0;i<ctx->Pixel.MapGtoGsize;i++) {
 482             values[i] = FLOAT_TO_UINT( ctx->Pixel.MapGtoG[i] );
 483          }
 484          break;
 485       case GL_PIXEL_MAP_B_TO_B:
 486          for (i=0;i<ctx->Pixel.MapBtoBsize;i++) {
 487             values[i] = FLOAT_TO_UINT( ctx->Pixel.MapBtoB[i] );
 488          }
 489          break;
 490       case GL_PIXEL_MAP_A_TO_A:
 491          for (i=0;i<ctx->Pixel.MapAtoAsize;i++) {
 492             values[i] = FLOAT_TO_UINT( ctx->Pixel.MapAtoA[i] );
 493          }
 494          break;
 495       default:
 496          _mesa_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
 497    }
 498 }
 499
 500
 501 void
 502 _mesa_GetPixelMapusv( GLenum map, GLushort *values )
 503 {
 504    GET_CURRENT_CONTEXT(ctx);
 505    GLint i;
 506    ASSERT_OUTSIDE_BEGIN_END(ctx);
 507
 508    switch (map) {
 509       case GL_PIXEL_MAP_I_TO_I:
 510          for (i=0;i<ctx->Pixel.MapItoIsize;i++) {
 511             values[i] = (GLushort) ctx->Pixel.MapItoI[i];
 512          }
 513          break;
 514       case GL_PIXEL_MAP_S_TO_S:
 515          for (i=0;i<ctx->Pixel.MapStoSsize;i++) {
 516             values[i] = (GLushort) ctx->Pixel.MapStoS[i];
 517          }
 518          break;
 519       case GL_PIXEL_MAP_I_TO_R:
 520          for (i=0;i<ctx->Pixel.MapItoRsize;i++) {
 521             values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoR[i] );
 522          }
 523          break;
 524       case GL_PIXEL_MAP_I_TO_G:
 525          for (i=0;i<ctx->Pixel.MapItoGsize;i++) {
 526             values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoG[i] );
 527          }
 528          break;
 529       case GL_PIXEL_MAP_I_TO_B:
 530          for (i=0;i<ctx->Pixel.MapItoBsize;i++) {
 531             values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoB[i] );
 532          }
 533          break;
 534       case GL_PIXEL_MAP_I_TO_A:
 535          for (i=0;i<ctx->Pixel.MapItoAsize;i++) {
 536             values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoA[i] );
 537          }
 538          break;
 539       case GL_PIXEL_MAP_R_TO_R:
 540          for (i=0;i<ctx->Pixel.MapRtoRsize;i++) {
 541             values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapRtoR[i] );
 542          }
 543          break;
 544       case GL_PIXEL_MAP_G_TO_G:
 545          for (i=0;i<ctx->Pixel.MapGtoGsize;i++) {
 546             values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapGtoG[i] );
 547          }
 548          break;
 549       case GL_PIXEL_MAP_B_TO_B:
 550          for (i=0;i<ctx->Pixel.MapBtoBsize;i++) {
 551             values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapBtoB[i] );
 552          }
 553          break;
 554       case GL_PIXEL_MAP_A_TO_A:
 555          for (i=0;i<ctx->Pixel.MapAtoAsize;i++) {
 556             values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapAtoA[i] );
 557          }
 558          break;
 559       default:
 560          _mesa_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
 561    }
 562 }
 563
 564
 565
 566 /**********************************************************************/
 567 /*****                       glPixelTransfer                      *****/
 568 /**********************************************************************/
 569
 570
 571 /*
 572  * Implements glPixelTransfer[fi] whether called immediately or from a
 573  * display list.
 574  */
 575 void
 576 _mesa_PixelTransferf( GLenum pname, GLfloat param )
 577 {
 578    GET_CURRENT_CONTEXT(ctx);
 579    ASSERT_OUTSIDE_BEGIN_END(ctx);
 580
 581    switch (pname) {
 582       case GL_MAP_COLOR:
 583          if (ctx->Pixel.MapColorFlag == (param ? GL_TRUE : GL_FALSE))
 584             return;
 585          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 586          ctx->Pixel.MapColorFlag = param ? GL_TRUE : GL_FALSE;
 587          break;
 588       case GL_MAP_STENCIL:
 589          if (ctx->Pixel.MapStencilFlag == (param ? GL_TRUE : GL_FALSE))
 590             return;
 591          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 592          ctx->Pixel.MapStencilFlag = param ? GL_TRUE : GL_FALSE;
 593          break;
 594       case GL_INDEX_SHIFT:
 595          if (ctx->Pixel.IndexShift == (GLint) param)
 596             return;
 597          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 598          ctx->Pixel.IndexShift = (GLint) param;
 599          break;
 600       case GL_INDEX_OFFSET:
 601          if (ctx->Pixel.IndexOffset == (GLint) param)
 602             return;
 603          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 604          ctx->Pixel.IndexOffset = (GLint) param;
 605          break;
 606       case GL_RED_SCALE:
 607          if (ctx->Pixel.RedScale == param)
 608             return;
 609          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 610          ctx->Pixel.RedScale = param;
 611          break;
 612       case GL_RED_BIAS:
 613          if (ctx->Pixel.RedBias == param)
 614             return;
 615          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 616          ctx->Pixel.RedBias = param;
 617          break;
 618       case GL_GREEN_SCALE:
 619          if (ctx->Pixel.GreenScale == param)
 620             return;
 621          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 622          ctx->Pixel.GreenScale = param;
 623          break;
 624       case GL_GREEN_BIAS:
 625          if (ctx->Pixel.GreenBias == param)
 626             return;
 627          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 628          ctx->Pixel.GreenBias = param;
 629          break;
 630       case GL_BLUE_SCALE:
 631          if (ctx->Pixel.BlueScale == param)
 632             return;
 633          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 634          ctx->Pixel.BlueScale = param;
 635          break;
 636       case GL_BLUE_BIAS:
 637          if (ctx->Pixel.BlueBias == param)
 638             return;
 639          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 640          ctx->Pixel.BlueBias = param;
 641          break;
 642       case GL_ALPHA_SCALE:
 643          if (ctx->Pixel.AlphaScale == param)
 644             return;
 645          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 646          ctx->Pixel.AlphaScale = param;
 647          break;
 648       case GL_ALPHA_BIAS:
 649          if (ctx->Pixel.AlphaBias == param)
 650             return;
 651          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 652          ctx->Pixel.AlphaBias = param;
 653          break;
 654       case GL_DEPTH_SCALE:
 655          if (ctx->Pixel.DepthScale == param)
 656             return;
 657          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 658          ctx->Pixel.DepthScale = param;
 659          break;
 660       case GL_DEPTH_BIAS:
 661          if (ctx->Pixel.DepthBias == param)
 662             return;
 663          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 664          ctx->Pixel.DepthBias = param;
 665          break;
 666       case GL_POST_COLOR_MATRIX_RED_SCALE:
 667          if (ctx->Pixel.PostColorMatrixScale[0] == param)
 668             return;
 669          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 670          ctx->Pixel.PostColorMatrixScale[0] = param;
 671          break;
 672       case GL_POST_COLOR_MATRIX_RED_BIAS:
 673          if (ctx->Pixel.PostColorMatrixBias[0] == param)
 674             return;
 675          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 676          ctx->Pixel.PostColorMatrixBias[0] = param;
 677          break;
 678       case GL_POST_COLOR_MATRIX_GREEN_SCALE:
 679          if (ctx->Pixel.PostColorMatrixScale[1] == param)
 680             return;
 681          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 682          ctx->Pixel.PostColorMatrixScale[1] = param;
 683          break;
 684       case GL_POST_COLOR_MATRIX_GREEN_BIAS:
 685          if (ctx->Pixel.PostColorMatrixBias[1] == param)
 686             return;
 687          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 688          ctx->Pixel.PostColorMatrixBias[1] = param;
 689          break;
 690       case GL_POST_COLOR_MATRIX_BLUE_SCALE:
 691          if (ctx->Pixel.PostColorMatrixScale[2] == param)
 692             return;
 693          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 694          ctx->Pixel.PostColorMatrixScale[2] = param;
 695          break;
 696       case GL_POST_COLOR_MATRIX_BLUE_BIAS:
 697          if (ctx->Pixel.PostColorMatrixBias[2] == param)
 698             return;
 699          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 700          ctx->Pixel.PostColorMatrixBias[2] = param;
 701          break;
 702       case GL_POST_COLOR_MATRIX_ALPHA_SCALE:
 703          if (ctx->Pixel.PostColorMatrixScale[3] == param)
 704             return;
 705          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 706          ctx->Pixel.PostColorMatrixScale[3] = param;
 707          break;
 708       case GL_POST_COLOR_MATRIX_ALPHA_BIAS:
 709          if (ctx->Pixel.PostColorMatrixBias[3] == param)
 710             return;
 711          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 712          ctx->Pixel.PostColorMatrixBias[3] = param;
 713          break;
 714       case GL_POST_CONVOLUTION_RED_SCALE:
 715          if (ctx->Pixel.PostConvolutionScale[0] == param)
 716             return;
 717          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 718          ctx->Pixel.PostConvolutionScale[0] = param;
 719          break;
 720       case GL_POST_CONVOLUTION_RED_BIAS:
 721          if (ctx->Pixel.PostConvolutionBias[0] == param)
 722             return;
 723          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 724          ctx->Pixel.PostConvolutionBias[0] = param;
 725          break;
 726       case GL_POST_CONVOLUTION_GREEN_SCALE:
 727          if (ctx->Pixel.PostConvolutionScale[1] == param)
 728             return;
 729          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 730          ctx->Pixel.PostConvolutionScale[1] = param;
 731          break;
 732       case GL_POST_CONVOLUTION_GREEN_BIAS:
 733          if (ctx->Pixel.PostConvolutionBias[1] == param)
 734             return;
 735          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 736          ctx->Pixel.PostConvolutionBias[1] = param;
 737          break;
 738       case GL_POST_CONVOLUTION_BLUE_SCALE:
 739          if (ctx->Pixel.PostConvolutionScale[2] == param)
 740             return;
 741          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 742          ctx->Pixel.PostConvolutionScale[2] = param;
 743          break;
 744       case GL_POST_CONVOLUTION_BLUE_BIAS:
 745          if (ctx->Pixel.PostConvolutionBias[2] == param)
 746             return;
 747          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 748          ctx->Pixel.PostConvolutionBias[2] = param;
 749          break;
 750       case GL_POST_CONVOLUTION_ALPHA_SCALE:
 751          if (ctx->Pixel.PostConvolutionScale[2] == param)
 752             return;
 753          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 754          ctx->Pixel.PostConvolutionScale[2] = param;
 755          break;
 756       case GL_POST_CONVOLUTION_ALPHA_BIAS:
 757          if (ctx->Pixel.PostConvolutionBias[2] == param)
 758             return;
 759          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 760          ctx->Pixel.PostConvolutionBias[2] = param;
 761          break;
 762       default:
 763          _mesa_error( ctx, GL_INVALID_ENUM, "glPixelTransfer(pname)" );
 764          return;
 765    }
 766 }
 767
 768
 769 void
 770 _mesa_PixelTransferi( GLenum pname, GLint param )
 771 {
 772    _mesa_PixelTransferf( pname, (GLfloat) param );
 773 }
 774
 775
 776
 777 /**********************************************************************/
 778 /*****                  Pixel processing functions               ******/
 779 /**********************************************************************/
 780
 781
 782 /*
 783  * Apply scale and bias factors to an array of RGBA pixels.
 784  */
 785 void
 786 _mesa_scale_and_bias_rgba(const GLcontext *ctx, GLuint n, GLfloat rgba[][4],
 787                           GLfloat rScale, GLfloat gScale,
 788                           GLfloat bScale, GLfloat aScale,
 789                           GLfloat rBias, GLfloat gBias,
 790                           GLfloat bBias, GLfloat aBias)
 791 {
 792    if (rScale != 1.0 || rBias != 0.0) {
 793       GLuint i;
 794       for (i = 0; i < n; i++) {
 795          rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias;
 796       }
 797    }
 798    if (gScale != 1.0 || gBias != 0.0) {
 799       GLuint i;
 800       for (i = 0; i < n; i++) {
 801          rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias;
 802       }
 803    }
 804    if (bScale != 1.0 || bBias != 0.0) {
 805       GLuint i;
 806       for (i = 0; i < n; i++) {
 807          rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias;
 808       }
 809    }
 810    if (aScale != 1.0 || aBias != 0.0) {
 811       GLuint i;
 812       for (i = 0; i < n; i++) {
 813          rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias;
 814       }
 815    }
 816 }
 817
 818
 819 /*
 820  * Apply pixel mapping to an array of floating point RGBA pixels.
 821  */
 822 void
 823 _mesa_map_rgba( const GLcontext *ctx, GLuint n, GLfloat rgba[][4] )
 824 {
 825    const GLfloat rscale = ctx->Pixel.MapRtoRsize - 1;
 826    const GLfloat gscale = ctx->Pixel.MapGtoGsize - 1;
 827    const GLfloat bscale = ctx->Pixel.MapBtoBsize - 1;
 828    const GLfloat ascale = ctx->Pixel.MapAtoAsize - 1;
 829    const GLfloat *rMap = ctx->Pixel.MapRtoR;
 830    const GLfloat *gMap = ctx->Pixel.MapGtoG;
 831    const GLfloat *bMap = ctx->Pixel.MapBtoB;
 832    const GLfloat *aMap = ctx->Pixel.MapAtoA;
 833    GLuint i;
 834    for (i=0;i<n;i++) {
 835       GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
 836       GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
 837       GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
 838       GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
 839       rgba[i][RCOMP] = rMap[IROUND(r * rscale)];
 840       rgba[i][GCOMP] = gMap[IROUND(g * gscale)];
 841       rgba[i][BCOMP] = bMap[IROUND(b * bscale)];
 842       rgba[i][ACOMP] = aMap[IROUND(a * ascale)];
 843    }
 844 }
 845
 846
 847 /*
 848  * Apply the color matrix and post color matrix scaling and biasing.
 849  */
 850 void
 851 _mesa_transform_rgba(const GLcontext *ctx, GLuint n, GLfloat rgba[][4])
 852 {
 853    const GLfloat rs = ctx->Pixel.PostColorMatrixScale[0];
 854    const GLfloat rb = ctx->Pixel.PostColorMatrixBias[0];
 855    const GLfloat gs = ctx->Pixel.PostColorMatrixScale[1];
 856    const GLfloat gb = ctx->Pixel.PostColorMatrixBias[1];
 857    const GLfloat bs = ctx->Pixel.PostColorMatrixScale[2];
 858    const GLfloat bb = ctx->Pixel.PostColorMatrixBias[2];
 859    const GLfloat as = ctx->Pixel.PostColorMatrixScale[3];
 860    const GLfloat ab = ctx->Pixel.PostColorMatrixBias[3];
 861    const GLfloat *m = ctx->ColorMatrix.m;
 862    GLuint i;
 863    for (i = 0; i < n; i++) {
 864       const GLfloat r = rgba[i][RCOMP];
 865       const GLfloat g = rgba[i][GCOMP];
 866       const GLfloat b = rgba[i][BCOMP];
 867       const GLfloat a = rgba[i][ACOMP];
 868       rgba[i][RCOMP] = (m[0] * r + m[4] * g + m[ 8] * b + m[12] * a) * rs + rb;
 869       rgba[i][GCOMP] = (m[1] * r + m[5] * g + m[ 9] * b + m[13] * a) * gs + gb;
 870       rgba[i][BCOMP] = (m[2] * r + m[6] * g + m[10] * b + m[14] * a) * bs + bb;
 871       rgba[i][ACOMP] = (m[3] * r + m[7] * g + m[11] * b + m[15] * a) * as + ab;
 872    }
 873 }
 874
 875
 876 /*
 877  * Apply a color table lookup to an array of colors.
 878  */
 879 void
 880 _mesa_lookup_rgba(const struct gl_color_table *table,
 881                   GLuint n, GLfloat rgba[][4])
 882 {
 883    ASSERT(table->FloatTable);
 884    if (!table->Table || table->Size == 0)
 885       return;
 886
 887    switch (table->Format) {
 888       case GL_INTENSITY:
 889          /* replace RGBA with I */
 890          if (!table->FloatTable) {
 891             const GLint max = table->Size - 1;
 892             const GLfloat scale = (GLfloat) max;
 893             const GLchan *lut = (const GLchan *) table->Table;
 894             GLuint i;
 895             for (i = 0; i < n; i++) {
 896                GLint j = IROUND(rgba[i][RCOMP] * scale);
 897                GLfloat c = CHAN_TO_FLOAT(lut[CLAMP(j, 0, 1)]);
 898                rgba[i][RCOMP] = rgba[i][GCOMP] =
 899                   rgba[i][BCOMP] = rgba[i][ACOMP] = c;
 900             }
 901
 902          }
 903          else {
 904             const GLint max = table->Size - 1;
 905             const GLfloat scale = (GLfloat) max;
 906             const GLfloat *lut = (const GLfloat *) table->Table;
 907             GLuint i;
 908             for (i = 0; i < n; i++) {
 909                GLint j = IROUND(rgba[i][RCOMP] * scale);
 910                GLfloat c = lut[CLAMP(j, 0, max)];
 911                rgba[i][RCOMP] = rgba[i][GCOMP] =
 912                   rgba[i][BCOMP] = rgba[i][ACOMP] = c;
 913             }
 914          }
 915          break;
 916       case GL_LUMINANCE:
 917          /* replace RGB with L */
 918          if (!table->FloatTable) {
 919             const GLint max = table->Size - 1;
 920             const GLfloat scale = (GLfloat) max;
 921             const GLchan *lut = (const GLchan *) table->Table;
 922             GLuint i;
 923             for (i = 0; i < n; i++) {
 924                GLint j = IROUND(rgba[i][RCOMP] * scale);
 925                GLfloat c = CHAN_TO_FLOAT(lut[CLAMP(j, 0, max)]);
 926                rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = c;
 927             }
 928          }
 929          else {
 930             const GLint max = table->Size - 1;
 931             const GLfloat scale = (GLfloat) max;
 932             const GLfloat *lut = (const GLfloat *) table->Table;
 933             GLuint i;
 934             for (i = 0; i < n; i++) {
 935                GLint j = IROUND(rgba[i][RCOMP] * scale);
 936                GLfloat c = lut[CLAMP(j, 0, max)];
 937                rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = c;
 938             }
 939          }
 940          break;
 941       case GL_ALPHA:
 942          /* replace A with A */
 943          if (!table->FloatTable) {
 944             const GLint max = table->Size - 1;
 945             const GLfloat scale = (GLfloat) max;
 946             const GLchan *lut = (const GLchan *) table->Table;
 947             GLuint i;
 948             for (i = 0; i < n; i++) {
 949                GLint j = IROUND(rgba[i][ACOMP] * scale);
 950                rgba[i][ACOMP] = CHAN_TO_FLOAT(lut[CLAMP(j, 0, max)]);
 951             }
 952          }
 953          else  {
 954             const GLint max = table->Size - 1;
 955             const GLfloat scale = (GLfloat) max;
 956             const GLfloat *lut = (const GLfloat *) table->Table;
 957             GLuint i;
 958             for (i = 0; i < n; i++) {
 959                GLint j = IROUND(rgba[i][ACOMP] * scale);
 960                rgba[i][ACOMP] = lut[CLAMP(j, 0, max)];
 961             }
 962          }
 963          break;
 964       case GL_LUMINANCE_ALPHA:
 965          /* replace RGBA with LLLA */
 966          if (!table->FloatTable) {
 967             const GLint max = table->Size - 1;
 968             const GLfloat scale = (GLfloat) max;
 969             const GLchan *lut = (const GLchan *) table->Table;
 970             GLuint i;
 971             for (i = 0; i < n; i++) {
 972                GLint jL = IROUND(rgba[i][RCOMP] * scale);
 973                GLint jA = IROUND(rgba[i][ACOMP] * scale);
 974                GLfloat luminance, alpha;
 975                jL = CLAMP(jL, 0, max);
 976                jA = CLAMP(jA, 0, max);
 977                luminance = CHAN_TO_FLOAT(lut[jL * 2 + 0]);
 978                alpha     = CHAN_TO_FLOAT(lut[jA * 2 + 1]);
 979                rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = luminance;
 980                rgba[i][ACOMP] = alpha;;
 981             }
 982          }
 983          else {
 984             const GLint max = table->Size - 1;
 985             const GLfloat scale = (GLfloat) max;
 986             const GLfloat *lut = (const GLfloat *) table->Table;
 987             GLuint i;
 988             for (i = 0; i < n; i++) {
 989                GLint jL = IROUND(rgba[i][RCOMP] * scale);
 990                GLint jA = IROUND(rgba[i][ACOMP] * scale);
 991                GLfloat luminance, alpha;
 992                jL = CLAMP(jL, 0, max);
 993                jA = CLAMP(jA, 0, max);
 994                luminance = lut[jL * 2 + 0];
 995                alpha     = lut[jA * 2 + 1];
 996                rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = luminance;
 997                rgba[i][ACOMP] = alpha;;
 998             }
 999          }
1000          break;
1001       case GL_RGB:
1002          /* replace RGB with RGB */
1003          if (!table->FloatTable) {
1004             const GLint max = table->Size - 1;
1005             const GLfloat scale = (GLfloat) max;
1006             const GLchan *lut = (const GLchan *) table->Table;
1007             GLuint i;
1008             for (i = 0; i < n; i++) {
1009                GLint jR = IROUND(rgba[i][RCOMP] * scale);
1010                GLint jG = IROUND(rgba[i][GCOMP] * scale);
1011                GLint jB = IROUND(rgba[i][BCOMP] * scale);
1012                jR = CLAMP(jR, 0, max);
1013                jG = CLAMP(jG, 0, max);
1014                jB = CLAMP(jB, 0, max);
1015                rgba[i][RCOMP] = CHAN_TO_FLOAT(lut[jR * 3 + 0]);
1016                rgba[i][GCOMP] = CHAN_TO_FLOAT(lut[jG * 3 + 1]);
1017                rgba[i][BCOMP] = CHAN_TO_FLOAT(lut[jB * 3 + 2]);
1018             }
1019          }
1020          else {
1021             const GLint max = table->Size - 1;
1022             const GLfloat scale = (GLfloat) max;
1023             const GLfloat *lut = (const GLfloat *) table->Table;
1024             GLuint i;
1025             for (i = 0; i < n; i++) {
1026                GLint jR = IROUND(rgba[i][RCOMP] * scale);
1027                GLint jG = IROUND(rgba[i][GCOMP] * scale);
1028                GLint jB = IROUND(rgba[i][BCOMP] * scale);
1029                jR = CLAMP(jR, 0, max);
1030                jG = CLAMP(jG, 0, max);
1031                jB = CLAMP(jB, 0, max);
1032                rgba[i][RCOMP] = lut[jR * 3 + 0];
1033                rgba[i][GCOMP] = lut[jG * 3 + 1];
1034                rgba[i][BCOMP] = lut[jB * 3 + 2];
1035             }
1036          }
1037          break;
1038       case GL_RGBA:
1039          /* replace RGBA with RGBA */
1040          if (!table->FloatTable) {
1041             const GLint max = table->Size - 1;
1042             const GLfloat scale = (GLfloat) max;
1043             const GLchan *lut = (const GLchan *) table->Table;
1044             GLuint i;
1045             for (i = 0; i < n; i++) {
1046                GLint jR = IROUND(rgba[i][RCOMP] * scale);
1047                GLint jG = IROUND(rgba[i][GCOMP] * scale);
1048                GLint jB = IROUND(rgba[i][BCOMP] * scale);
1049                GLint jA = IROUND(rgba[i][ACOMP] * scale);
1050                jR = CLAMP(jR, 0, max);
1051                jG = CLAMP(jG, 0, max);
1052                jB = CLAMP(jB, 0, max);
1053                jA = CLAMP(jA, 0, max);
1054                rgba[i][RCOMP] = CHAN_TO_FLOAT(lut[jR * 4 + 0]);
1055                rgba[i][GCOMP] = CHAN_TO_FLOAT(lut[jG * 4 + 1]);
1056                rgba[i][BCOMP] = CHAN_TO_FLOAT(lut[jB * 4 + 2]);
1057                rgba[i][ACOMP] = CHAN_TO_FLOAT(lut[jA * 4 + 3]);
1058             }
1059          }
1060          else {
1061             const GLint max = table->Size - 1;
1062             const GLfloat scale = (GLfloat) max;
1063             const GLfloat *lut = (const GLfloat *) table->Table;
1064             GLuint i;
1065             for (i = 0; i < n; i++) {
1066                GLint jR = IROUND(rgba[i][RCOMP] * scale);
1067                GLint jG = IROUND(rgba[i][GCOMP] * scale);
1068                GLint jB = IROUND(rgba[i][BCOMP] * scale);
1069                GLint jA = IROUND(rgba[i][ACOMP] * scale);
1070                jR = CLAMP(jR, 0, max);
1071                jG = CLAMP(jG, 0, max);
1072                jB = CLAMP(jB, 0, max);
1073                jA = CLAMP(jA, 0, max);
1074                rgba[i][RCOMP] = lut[jR * 4 + 0];
1075                rgba[i][GCOMP] = lut[jG * 4 + 1];
1076                rgba[i][BCOMP] = lut[jB * 4 + 2];
1077                rgba[i][ACOMP] = lut[jA * 4 + 3];
1078             }
1079          }
1080          break;
1081       default:
1082          _mesa_problem(NULL, "Bad format in _mesa_lookup_rgba");
1083          return;
1084    }
1085 }
1086
1087
1088
1089 /*
1090  * Apply color index shift and offset to an array of pixels.
1091  */
1092 void
1093 _mesa_shift_and_offset_ci( const GLcontext *ctx, GLuint n, GLuint indexes[] )
1094 {
1095    GLint shift = ctx->Pixel.IndexShift;
1096    GLint offset = ctx->Pixel.IndexOffset;
1097    GLuint i;
1098    if (shift > 0) {
1099       for (i=0;i<n;i++) {
1100          indexes[i] = (indexes[i] << shift) + offset;
1101       }
1102    }
1103    else if (shift < 0) {
1104       shift = -shift;
1105       for (i=0;i<n;i++) {
1106          indexes[i] = (indexes[i] >> shift) + offset;
1107       }
1108    }
1109    else {
1110       for (i=0;i<n;i++) {
1111          indexes[i] = indexes[i] + offset;
1112       }
1113    }
1114 }
1115
1116
1117 /*
1118  * Apply color index mapping to color indexes.
1119  */
1120 void
1121 _mesa_map_ci( const GLcontext *ctx, GLuint n, GLuint index[] )
1122 {
1123    GLuint mask = ctx->Pixel.MapItoIsize - 1;
1124    GLuint i;
1125    for (i=0;i<n;i++) {
1126       index[i] = ctx->Pixel.MapItoI[ index[i] & mask ];
1127    }
1128 }
1129
1130
1131 /*
1132  * Map color indexes to rgba values.
1133  */
1134 void
1135 _mesa_map_ci_to_rgba_chan( const GLcontext *ctx, GLuint n,
1136                            const GLuint index[], GLchan rgba[][4] )
1137 {
1138 #if CHAN_BITS == 8
1139    GLuint rmask = ctx->Pixel.MapItoRsize - 1;
1140    GLuint gmask = ctx->Pixel.MapItoGsize - 1;
1141    GLuint bmask = ctx->Pixel.MapItoBsize - 1;
1142    GLuint amask = ctx->Pixel.MapItoAsize - 1;
1143    const GLubyte *rMap = ctx->Pixel.MapItoR8;
1144    const GLubyte *gMap = ctx->Pixel.MapItoG8;
1145    const GLubyte *bMap = ctx->Pixel.MapItoB8;
1146    const GLubyte *aMap = ctx->Pixel.MapItoA8;
1147    GLuint i;
1148    for (i=0;i<n;i++) {
1149       rgba[i][RCOMP] = rMap[index[i] & rmask];
1150       rgba[i][GCOMP] = gMap[index[i] & gmask];
1151       rgba[i][BCOMP] = bMap[index[i] & bmask];
1152       rgba[i][ACOMP] = aMap[index[i] & amask];
1153    }
1154 #else
1155    GLuint rmask = ctx->Pixel.MapItoRsize - 1;
1156    GLuint gmask = ctx->Pixel.MapItoGsize - 1;
1157    GLuint bmask = ctx->Pixel.MapItoBsize - 1;
1158    GLuint amask = ctx->Pixel.MapItoAsize - 1;
1159    const GLfloat *rMap = ctx->Pixel.MapItoR;
1160    const GLfloat *gMap = ctx->Pixel.MapItoG;
1161    const GLfloat *bMap = ctx->Pixel.MapItoB;
1162    const GLfloat *aMap = ctx->Pixel.MapItoA;
1163    GLuint i;
1164    for (i=0;i<n;i++) {
1165       CLAMPED_FLOAT_TO_CHAN(rgba[i][RCOMP], rMap[index[i] & rmask]);
1166       CLAMPED_FLOAT_TO_CHAN(rgba[i][GCOMP], gMap[index[i] & gmask]);
1167       CLAMPED_FLOAT_TO_CHAN(rgba[i][BCOMP], bMap[index[i] & bmask]);
1168       CLAMPED_FLOAT_TO_CHAN(rgba[i][ACOMP], aMap[index[i] & amask]);
1169    }
1170 #endif
1171 }
1172
1173
1174 /*
1175  * Map color indexes to float rgba values.
1176  */
1177 void
1178 _mesa_map_ci_to_rgba( const GLcontext *ctx, GLuint n,
1179                       const GLuint index[], GLfloat rgba[][4] )
1180 {
1181    GLuint rmask = ctx->Pixel.MapItoRsize - 1;
1182    GLuint gmask = ctx->Pixel.MapItoGsize - 1;
1183    GLuint bmask = ctx->Pixel.MapItoBsize - 1;
1184    GLuint amask = ctx->Pixel.MapItoAsize - 1;
1185    const GLfloat *rMap = ctx->Pixel.MapItoR;
1186    const GLfloat *gMap = ctx->Pixel.MapItoG;
1187    const GLfloat *bMap = ctx->Pixel.MapItoB;
1188    const GLfloat *aMap = ctx->Pixel.MapItoA;
1189    GLuint i;
1190    for (i=0;i<n;i++) {
1191       rgba[i][RCOMP] = rMap[index[i] & rmask];
1192       rgba[i][GCOMP] = gMap[index[i] & gmask];
1193       rgba[i][BCOMP] = bMap[index[i] & bmask];
1194       rgba[i][ACOMP] = aMap[index[i] & amask];
1195    }
1196 }
1197
1198
1199 /*
1200  * Map 8-bit color indexes to rgb values.
1201  */
1202 void
1203 _mesa_map_ci8_to_rgba( const GLcontext *ctx, GLuint n, const GLubyte index[],
1204                        GLchan rgba[][4] )
1205 {
1206 #if CHAN_BITS == 8
1207    GLuint rmask = ctx->Pixel.MapItoRsize - 1;
1208    GLuint gmask = ctx->Pixel.MapItoGsize - 1;
1209    GLuint bmask = ctx->Pixel.MapItoBsize - 1;
1210    GLuint amask = ctx->Pixel.MapItoAsize - 1;
1211    const GLubyte *rMap = ctx->Pixel.MapItoR8;
1212    const GLubyte *gMap = ctx->Pixel.MapItoG8;
1213    const GLubyte *bMap = ctx->Pixel.MapItoB8;
1214    const GLubyte *aMap = ctx->Pixel.MapItoA8;
1215    GLuint i;
1216    for (i=0;i<n;i++) {
1217       rgba[i][RCOMP] = rMap[index[i] & rmask];
1218       rgba[i][GCOMP] = gMap[index[i] & gmask];
1219       rgba[i][BCOMP] = bMap[index[i] & bmask];
1220       rgba[i][ACOMP] = aMap[index[i] & amask];
1221    }
1222 #else
1223    GLuint rmask = ctx->Pixel.MapItoRsize - 1;
1224    GLuint gmask = ctx->Pixel.MapItoGsize - 1;
1225    GLuint bmask = ctx->Pixel.MapItoBsize - 1;
1226    GLuint amask = ctx->Pixel.MapItoAsize - 1;
1227    const GLfloat *rMap = ctx->Pixel.MapItoR;
1228    const GLfloat *gMap = ctx->Pixel.MapItoG;
1229    const GLfloat *bMap = ctx->Pixel.MapItoB;
1230    const GLfloat *aMap = ctx->Pixel.MapItoA;
1231    GLuint i;
1232    for (i=0;i<n;i++) {
1233       CLAMPED_FLOAT_TO_CHAN(rgba[i][RCOMP], rMap[index[i] & rmask]);
1234       CLAMPED_FLOAT_TO_CHAN(rgba[i][GCOMP], gMap[index[i] & gmask]);
1235       CLAMPED_FLOAT_TO_CHAN(rgba[i][BCOMP], bMap[index[i] & bmask]);
1236       CLAMPED_FLOAT_TO_CHAN(rgba[i][ACOMP], aMap[index[i] & amask]);
1237    }
1238 #endif
1239 }
1240
1241
1242 void
1243 _mesa_shift_and_offset_stencil( const GLcontext *ctx, GLuint n,
1244                                 GLstencil stencil[] )
1245 {
1246    GLuint i;
1247    GLint shift = ctx->Pixel.IndexShift;
1248    GLint offset = ctx->Pixel.IndexOffset;
1249    if (shift > 0) {
1250       for (i=0;i<n;i++) {
1251          stencil[i] = (stencil[i] << shift) + offset;
1252       }
1253    }
1254    else if (shift < 0) {
1255       shift = -shift;
1256       for (i=0;i<n;i++) {
1257          stencil[i] = (stencil[i] >> shift) + offset;
1258       }
1259    }
1260    else {
1261       for (i=0;i<n;i++) {
1262          stencil[i] = stencil[i] + offset;
1263       }
1264    }
1265
1266 }
1267
1268
1269 void
1270 _mesa_map_stencil( const GLcontext *ctx, GLuint n, GLstencil stencil[] )
1271 {
1272    GLuint mask = ctx->Pixel.MapStoSsize - 1;
1273    GLuint i;
1274    for (i=0;i<n;i++) {
1275       stencil[i] = ctx->Pixel.MapStoS[ stencil[i] & mask ];
1276    }
1277 }
1278
1279
1280
1281 /*
1282  * This function converts an array of GLchan colors to GLfloat colors.
1283  * Most importantly, it undoes the non-uniform quantization of pixel
1284  * values introduced when we convert shallow (< 8 bit) pixel values
1285  * to GLubytes in the ctx->Driver.ReadRGBASpan() functions.
1286  * This fixes a number of OpenGL conformance failures when running on
1287  * 16bpp displays, for example.
1288  */
1289 void
1290 _mesa_chan_to_float_span(const GLcontext *ctx, GLuint n,
1291                          CONST GLchan rgba[][4], GLfloat rgbaf[][4])
1292 {
1293 #if CHAN_TYPE == GL_FLOAT
1294    MEMCPY(rgbaf, rgba, n * 4 * sizeof(GLfloat));
1295 #else
1296    const GLuint rShift = CHAN_BITS - ctx->Visual.redBits;
1297    const GLuint gShift = CHAN_BITS - ctx->Visual.greenBits;
1298    const GLuint bShift = CHAN_BITS - ctx->Visual.blueBits;
1299    GLuint aShift;
1300    const GLfloat rScale = 1.0 / (GLfloat) ((1 << ctx->Visual.redBits  ) - 1);
1301    const GLfloat gScale = 1.0 / (GLfloat) ((1 << ctx->Visual.greenBits) - 1);
1302    const GLfloat bScale = 1.0 / (GLfloat) ((1 << ctx->Visual.blueBits ) - 1);
1303    GLfloat aScale;
1304    GLuint i;
1305
1306    if (ctx->Visual.alphaBits > 0) {
1307       aShift = CHAN_BITS - ctx->Visual.alphaBits;
1308       aScale = 1.0 / (GLfloat) ((1 << ctx->Visual.alphaBits) - 1);
1309    }
1310    else {
1311       aShift = 0;
1312       aScale = 1.0F / CHAN_MAXF;
1313    }
1314
1315    for (i = 0; i < n; i++) {
1316       const GLint r = rgba[i][RCOMP] >> rShift;
1317       const GLint g = rgba[i][GCOMP] >> gShift;
1318       const GLint b = rgba[i][BCOMP] >> bShift;
1319       const GLint a = rgba[i][ACOMP] >> aShift;
1320       rgbaf[i][RCOMP] = (GLfloat) r * rScale;
1321       rgbaf[i][GCOMP] = (GLfloat) g * gScale;
1322       rgbaf[i][BCOMP] = (GLfloat) b * bScale;
1323       rgbaf[i][ACOMP] = (GLfloat) a * aScale;
1324    }
1325 #endif
1326 }