reactos/dll/opengl/mesa/main/pixel.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  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 /**
  27  * \file pixel.c
  28  * Pixel transfer functions (glPixelZoom, glPixelMap, glPixelTransfer)
  29  */
  30
  31 #include "glheader.h"
  32 #include "bufferobj.h"
  33 #include "colormac.h"
  34 #include "context.h"
  35 #include "macros.h"
  36 #include "mfeatures.h"
  37 #include "pixel.h"
  38 #include "pbo.h"
  39 #include "mtypes.h"
  40 #include "main/dispatch.h"
  41
  42
  43 #if FEATURE_pixel_transfer
  44
  45
  46 /**********************************************************************/
  47 /*****                    glPixelZoom                             *****/
  48 /**********************************************************************/
  49
  50 static void GLAPIENTRY
  51 _mesa_PixelZoom( GLfloat xfactor, GLfloat yfactor )
  52 {
  53    GET_CURRENT_CONTEXT(ctx);
  54
  55    ASSERT_OUTSIDE_BEGIN_END(ctx);
  56
  57    if (ctx->Pixel.ZoomX == xfactor &&
  58        ctx->Pixel.ZoomY == yfactor)
  59       return;
  60
  61    FLUSH_VERTICES(ctx, _NEW_PIXEL);
  62    ctx->Pixel.ZoomX = xfactor;
  63    ctx->Pixel.ZoomY = yfactor;
  64 }
  65
  66
  67
  68 /**********************************************************************/
  69 /*****                         glPixelMap                         *****/
  70 /**********************************************************************/
  71
  72 /**
  73  * Return pointer to a pixelmap by name.
  74  */
  75 static struct gl_pixelmap *
  76 get_pixelmap(struct gl_context *ctx, GLenum map)
  77 {
  78    switch (map) {
  79    case GL_PIXEL_MAP_I_TO_I:
  80       return &ctx->PixelMaps.ItoI;
  81    case GL_PIXEL_MAP_S_TO_S:
  82       return &ctx->PixelMaps.StoS;
  83    case GL_PIXEL_MAP_I_TO_R:
  84       return &ctx->PixelMaps.ItoR;
  85    case GL_PIXEL_MAP_I_TO_G:
  86       return &ctx->PixelMaps.ItoG;
  87    case GL_PIXEL_MAP_I_TO_B:
  88       return &ctx->PixelMaps.ItoB;
  89    case GL_PIXEL_MAP_I_TO_A:
  90       return &ctx->PixelMaps.ItoA;
  91    case GL_PIXEL_MAP_R_TO_R:
  92       return &ctx->PixelMaps.RtoR;
  93    case GL_PIXEL_MAP_G_TO_G:
  94       return &ctx->PixelMaps.GtoG;
  95    case GL_PIXEL_MAP_B_TO_B:
  96       return &ctx->PixelMaps.BtoB;
  97    case GL_PIXEL_MAP_A_TO_A:
  98       return &ctx->PixelMaps.AtoA;
  99    default:
 100       return NULL;
 101    }
 102 }
 103
 104
 105 /**
 106  * Helper routine used by the other _mesa_PixelMap() functions.
 107  */
 108 static void
 109 store_pixelmap(struct gl_context *ctx, GLenum map, GLsizei mapsize,
 110                const GLfloat *values)
 111 {
 112    GLint i;
 113    struct gl_pixelmap *pm = get_pixelmap(ctx, map);
 114    if (!pm) {
 115       _mesa_error(ctx, GL_INVALID_ENUM, "glPixelMap(map)");
 116       return;
 117    }
 118
 119    switch (map) {
 120    case GL_PIXEL_MAP_S_TO_S:
 121       /* special case */
 122       ctx->PixelMaps.StoS.Size = mapsize;
 123       for (i = 0; i < mapsize; i++) {
 124          ctx->PixelMaps.StoS.Map[i] = (GLfloat)IROUND(values[i]);
 125       }
 126       break;
 127    case GL_PIXEL_MAP_I_TO_I:
 128       /* special case */
 129       ctx->PixelMaps.ItoI.Size = mapsize;
 130       for (i = 0; i < mapsize; i++) {
 131          ctx->PixelMaps.ItoI.Map[i] = values[i];
 132       }
 133       break;
 134    default:
 135       /* general case */
 136       pm->Size = mapsize;
 137       for (i = 0; i < mapsize; i++) {
 138          GLfloat val = CLAMP(values[i], 0.0F, 1.0F);
 139          pm->Map[i] = val;
 140          pm->Map8[i] = (GLint) (val * 255.0F);
 141       }
 142    }
 143 }
 144
 145
 146 /**
 147  * Convenience wrapper for _mesa_validate_pbo_access() for gl[Get]PixelMap().
 148  */
 149 static GLboolean
 150 validate_pbo_access(struct gl_context *ctx,
 151                     struct gl_pixelstore_attrib *pack, GLsizei mapsize,
 152                     GLenum format, GLenum type, GLsizei clientMemSize,
 153                     const GLvoid *ptr)
 154 {
 155    GLboolean ok;
 156
 157    /* Note, need to use DefaultPacking and Unpack's buffer object */
 158    _mesa_reference_buffer_object(ctx,
 159                                  &ctx->DefaultPacking.BufferObj,
 160                                  pack->BufferObj);
 161
 162    ok = _mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
 163                                   format, type, clientMemSize, ptr);
 164
 165    /* restore */
 166    _mesa_reference_buffer_object(ctx,
 167                                  &ctx->DefaultPacking.BufferObj,
 168                                  ctx->Shared->NullBufferObj);
 169
 170    if (!ok) {
 171       if (_mesa_is_bufferobj(pack->BufferObj)) {
 172          _mesa_error(ctx, GL_INVALID_OPERATION,
 173                      "gl[Get]PixelMap*v(out of bounds PBO access)");
 174       } else {
 175          _mesa_error(ctx, GL_INVALID_OPERATION,
 176                      "glGetnPixelMap*vARB(out of bounds access:"
 177                      " bufSize (%d) is too small)", clientMemSize);
 178       }
 179    }
 180    return ok;
 181 }
 182
 183
 184 static void GLAPIENTRY
 185 _mesa_PixelMapfv( GLenum map, GLsizei mapsize, const GLfloat *values )
 186 {
 187    GET_CURRENT_CONTEXT(ctx);
 188    ASSERT_OUTSIDE_BEGIN_END(ctx);
 189
 190    /* XXX someday, test against ctx->Const.MaxPixelMapTableSize */
 191    if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
 192       _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
 193       return;
 194    }
 195
 196    if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
 197       /* test that mapsize is a power of two */
 198       if (!_mesa_is_pow_two(mapsize)) {
 199          _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
 200          return;
 201       }
 202    }
 203
 204    FLUSH_VERTICES(ctx, _NEW_PIXEL);
 205
 206    if (!validate_pbo_access(ctx, &ctx->Unpack, mapsize, GL_INTENSITY,
 207                             GL_FLOAT, INT_MAX, values)) {
 208       return;
 209    }
 210
 211    values = (const GLfloat *) _mesa_map_pbo_source(ctx, &ctx->Unpack, values);
 212    if (!values) {
 213       if (_mesa_is_bufferobj(ctx->Unpack.BufferObj)) {
 214          _mesa_error(ctx, GL_INVALID_OPERATION,
 215                      "glPixelMapfv(PBO is mapped)");
 216       }
 217       return;
 218    }
 219
 220    store_pixelmap(ctx, map, mapsize, values);
 221
 222    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 223 }
 224
 225
 226 static void GLAPIENTRY
 227 _mesa_PixelMapuiv(GLenum map, GLsizei mapsize, const GLuint *values )
 228 {
 229    GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
 230    GET_CURRENT_CONTEXT(ctx);
 231    ASSERT_OUTSIDE_BEGIN_END(ctx);
 232
 233    if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
 234       _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
 235       return;
 236    }
 237
 238    if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
 239       /* test that mapsize is a power of two */
 240       if (!_mesa_is_pow_two(mapsize)) {
 241          _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
 242          return;
 243       }
 244    }
 245
 246    FLUSH_VERTICES(ctx, _NEW_PIXEL);
 247
 248    if (!validate_pbo_access(ctx, &ctx->Unpack, mapsize, GL_INTENSITY,
 249                             GL_UNSIGNED_INT, INT_MAX, values)) {
 250       return;
 251    }
 252
 253    values = (const GLuint *) _mesa_map_pbo_source(ctx, &ctx->Unpack, values);
 254    if (!values) {
 255       if (_mesa_is_bufferobj(ctx->Unpack.BufferObj)) {
 256          _mesa_error(ctx, GL_INVALID_OPERATION,
 257                      "glPixelMapuiv(PBO is mapped)");
 258       }
 259       return;
 260    }
 261
 262    /* convert to floats */
 263    if (map == GL_PIXEL_MAP_I_TO_I || map == GL_PIXEL_MAP_S_TO_S) {
 264       GLint i;
 265       for (i = 0; i < mapsize; i++) {
 266          fvalues[i] = (GLfloat) values[i];
 267       }
 268    }
 269    else {
 270       GLint i;
 271       for (i = 0; i < mapsize; i++) {
 272          fvalues[i] = UINT_TO_FLOAT( values[i] );
 273       }
 274    }
 275
 276    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 277
 278    store_pixelmap(ctx, map, mapsize, fvalues);
 279 }
 280
 281
 282 static void GLAPIENTRY
 283 _mesa_PixelMapusv(GLenum map, GLsizei mapsize, const GLushort *values )
 284 {
 285    GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
 286    GET_CURRENT_CONTEXT(ctx);
 287    ASSERT_OUTSIDE_BEGIN_END(ctx);
 288
 289    if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
 290       _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapusv(mapsize)" );
 291       return;
 292    }
 293
 294    if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
 295       /* test that mapsize is a power of two */
 296       if (!_mesa_is_pow_two(mapsize)) {
 297          _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
 298          return;
 299       }
 300    }
 301
 302    FLUSH_VERTICES(ctx, _NEW_PIXEL);
 303
 304    if (!validate_pbo_access(ctx, &ctx->Unpack, mapsize, GL_INTENSITY,
 305                             GL_UNSIGNED_SHORT, INT_MAX, values)) {
 306       return;
 307    }
 308
 309    values = (const GLushort *) _mesa_map_pbo_source(ctx, &ctx->Unpack, values);
 310    if (!values) {
 311       if (_mesa_is_bufferobj(ctx->Unpack.BufferObj)) {
 312          _mesa_error(ctx, GL_INVALID_OPERATION,
 313                      "glPixelMapusv(PBO is mapped)");
 314       }
 315       return;
 316    }
 317
 318    /* convert to floats */
 319    if (map == GL_PIXEL_MAP_I_TO_I || map == GL_PIXEL_MAP_S_TO_S) {
 320       GLint i;
 321       for (i = 0; i < mapsize; i++) {
 322          fvalues[i] = (GLfloat) values[i];
 323       }
 324    }
 325    else {
 326       GLint i;
 327       for (i = 0; i < mapsize; i++) {
 328          fvalues[i] = USHORT_TO_FLOAT( values[i] );
 329       }
 330    }
 331
 332    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 333
 334    store_pixelmap(ctx, map, mapsize, fvalues);
 335 }
 336
 337
 338 static void GLAPIENTRY
 339 _mesa_GetnPixelMapfvARB( GLenum map, GLsizei bufSize, GLfloat *values )
 340 {
 341    GET_CURRENT_CONTEXT(ctx);
 342    GLint mapsize, i;
 343    const struct gl_pixelmap *pm;
 344
 345    ASSERT_OUTSIDE_BEGIN_END(ctx);
 346
 347    pm = get_pixelmap(ctx, map);
 348    if (!pm) {
 349       _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapfv(map)");
 350       return;
 351    }
 352
 353    mapsize = pm->Size;
 354
 355    if (!validate_pbo_access(ctx, &ctx->Pack, mapsize, GL_INTENSITY,
 356                             GL_FLOAT, bufSize, values)) {
 357       return;
 358    }
 359
 360    values = (GLfloat *) _mesa_map_pbo_dest(ctx, &ctx->Pack, values);
 361    if (!values) {
 362       if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 363          _mesa_error(ctx, GL_INVALID_OPERATION,
 364                      "glGetPixelMapfv(PBO is mapped)");
 365       }
 366       return;
 367    }
 368
 369    if (map == GL_PIXEL_MAP_S_TO_S) {
 370       /* special case */
 371       for (i = 0; i < mapsize; i++) {
 372          values[i] = (GLfloat) ctx->PixelMaps.StoS.Map[i];
 373       }
 374    }
 375    else {
 376       memcpy(values, pm->Map, mapsize * sizeof(GLfloat));
 377    }
 378
 379    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 380 }
 381
 382
 383 static void GLAPIENTRY
 384 _mesa_GetPixelMapfv( GLenum map, GLfloat *values )
 385 {
 386    _mesa_GetnPixelMapfvARB(map, INT_MAX, values);
 387 }
 388
 389 static void GLAPIENTRY
 390 _mesa_GetnPixelMapuivARB( GLenum map, GLsizei bufSize, GLuint *values )
 391 {
 392    GET_CURRENT_CONTEXT(ctx);
 393    GLint mapsize, i;
 394    const struct gl_pixelmap *pm;
 395
 396    ASSERT_OUTSIDE_BEGIN_END(ctx);
 397
 398    pm = get_pixelmap(ctx, map);
 399    if (!pm) {
 400       _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapuiv(map)");
 401       return;
 402    }
 403
 404    mapsize = pm->Size;
 405
 406    if (!validate_pbo_access(ctx, &ctx->Pack, mapsize, GL_INTENSITY,
 407                             GL_UNSIGNED_INT, bufSize, values)) {
 408       return;
 409    }
 410
 411    values = (GLuint *) _mesa_map_pbo_dest(ctx, &ctx->Pack, values);
 412    if (!values) {
 413       if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 414          _mesa_error(ctx, GL_INVALID_OPERATION,
 415                      "glGetPixelMapuiv(PBO is mapped)");
 416       }
 417       return;
 418    }
 419
 420    if (map == GL_PIXEL_MAP_S_TO_S) {
 421       /* special case */
 422       memcpy(values, ctx->PixelMaps.StoS.Map, mapsize * sizeof(GLint));
 423    }
 424    else {
 425       for (i = 0; i < mapsize; i++) {
 426          values[i] = FLOAT_TO_UINT( pm->Map[i] );
 427       }
 428    }
 429
 430    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 431 }
 432
 433
 434 static void GLAPIENTRY
 435 _mesa_GetPixelMapuiv( GLenum map, GLuint *values )
 436 {
 437    _mesa_GetnPixelMapuivARB(map, INT_MAX, values);
 438 }
 439
 440 static void GLAPIENTRY
 441 _mesa_GetnPixelMapusvARB( GLenum map, GLsizei bufSize, GLushort *values )
 442 {
 443    GET_CURRENT_CONTEXT(ctx);
 444    GLint mapsize, i;
 445    const struct gl_pixelmap *pm;
 446
 447    ASSERT_OUTSIDE_BEGIN_END(ctx);
 448
 449    pm = get_pixelmap(ctx, map);
 450    if (!pm) {
 451       _mesa_error(ctx, GL_INVALID_ENUM, "glGetPixelMapusv(map)");
 452       return;
 453    }
 454
 455    mapsize = pm->Size;
 456
 457    if (!validate_pbo_access(ctx, &ctx->Pack, mapsize, GL_INTENSITY,
 458                             GL_UNSIGNED_SHORT, bufSize, values)) {
 459       return;
 460    }
 461
 462    values = (GLushort *) _mesa_map_pbo_dest(ctx, &ctx->Pack, values);
 463    if (!values) {
 464       if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 465          _mesa_error(ctx, GL_INVALID_OPERATION,
 466                      "glGetPixelMapusv(PBO is mapped)");
 467       }
 468       return;
 469    }
 470
 471    switch (map) {
 472    /* special cases */
 473    case GL_PIXEL_MAP_I_TO_I:
 474       for (i = 0; i < mapsize; i++) {
 475          values[i] = (GLushort) CLAMP(ctx->PixelMaps.ItoI.Map[i], 0.0, 65535.);
 476       }
 477       break;
 478    case GL_PIXEL_MAP_S_TO_S:
 479       for (i = 0; i < mapsize; i++) {
 480          values[i] = (GLushort) CLAMP(ctx->PixelMaps.StoS.Map[i], 0.0, 65535.);
 481       }
 482       break;
 483    default:
 484       for (i = 0; i < mapsize; i++) {
 485          CLAMPED_FLOAT_TO_USHORT(values[i], pm->Map[i] );
 486       }
 487    }
 488
 489    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 490 }
 491
 492
 493 static void GLAPIENTRY
 494 _mesa_GetPixelMapusv( GLenum map, GLushort *values )
 495 {
 496    _mesa_GetnPixelMapusvARB(map, INT_MAX, values);
 497 }
 498
 499
 500 /**********************************************************************/
 501 /*****                       glPixelTransfer                      *****/
 502 /**********************************************************************/
 503
 504
 505 /*
 506  * Implements glPixelTransfer[fi] whether called immediately or from a
 507  * display list.
 508  */
 509 void GLAPIENTRY
 510 _mesa_PixelTransferf( GLenum pname, GLfloat param )
 511 {
 512    GET_CURRENT_CONTEXT(ctx);
 513    ASSERT_OUTSIDE_BEGIN_END(ctx);
 514
 515    switch (pname) {
 516       case GL_MAP_COLOR:
 517          if (ctx->Pixel.MapColorFlag == (param ? GL_TRUE : GL_FALSE))
 518             return;
 519          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 520          ctx->Pixel.MapColorFlag = param ? GL_TRUE : GL_FALSE;
 521          break;
 522       case GL_MAP_STENCIL:
 523          if (ctx->Pixel.MapStencilFlag == (param ? GL_TRUE : GL_FALSE))
 524             return;
 525          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 526          ctx->Pixel.MapStencilFlag = param ? GL_TRUE : GL_FALSE;
 527          break;
 528       case GL_INDEX_SHIFT:
 529          if (ctx->Pixel.IndexShift == (GLint) param)
 530             return;
 531          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 532          ctx->Pixel.IndexShift = (GLint) param;
 533          break;
 534       case GL_INDEX_OFFSET:
 535          if (ctx->Pixel.IndexOffset == (GLint) param)
 536             return;
 537          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 538          ctx->Pixel.IndexOffset = (GLint) param;
 539          break;
 540       case GL_RED_SCALE:
 541          if (ctx->Pixel.RedScale == param)
 542             return;
 543          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 544          ctx->Pixel.RedScale = param;
 545          break;
 546       case GL_RED_BIAS:
 547          if (ctx->Pixel.RedBias == param)
 548             return;
 549          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 550          ctx->Pixel.RedBias = param;
 551          break;
 552       case GL_GREEN_SCALE:
 553          if (ctx->Pixel.GreenScale == param)
 554             return;
 555          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 556          ctx->Pixel.GreenScale = param;
 557          break;
 558       case GL_GREEN_BIAS:
 559          if (ctx->Pixel.GreenBias == param)
 560             return;
 561          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 562          ctx->Pixel.GreenBias = param;
 563          break;
 564       case GL_BLUE_SCALE:
 565          if (ctx->Pixel.BlueScale == param)
 566             return;
 567          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 568          ctx->Pixel.BlueScale = param;
 569          break;
 570       case GL_BLUE_BIAS:
 571          if (ctx->Pixel.BlueBias == param)
 572             return;
 573          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 574          ctx->Pixel.BlueBias = param;
 575          break;
 576       case GL_ALPHA_SCALE:
 577          if (ctx->Pixel.AlphaScale == param)
 578             return;
 579          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 580          ctx->Pixel.AlphaScale = param;
 581          break;
 582       case GL_ALPHA_BIAS:
 583          if (ctx->Pixel.AlphaBias == param)
 584             return;
 585          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 586          ctx->Pixel.AlphaBias = param;
 587          break;
 588       case GL_DEPTH_SCALE:
 589          if (ctx->Pixel.DepthScale == param)
 590             return;
 591          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 592          ctx->Pixel.DepthScale = param;
 593          break;
 594       case GL_DEPTH_BIAS:
 595          if (ctx->Pixel.DepthBias == param)
 596             return;
 597          FLUSH_VERTICES(ctx, _NEW_PIXEL);
 598          ctx->Pixel.DepthBias = param;
 599          break;
 600       default:
 601          _mesa_error( ctx, GL_INVALID_ENUM, "glPixelTransfer(pname)" );
 602          return;
 603    }
 604 }
 605
 606
 607 static void GLAPIENTRY
 608 _mesa_PixelTransferi( GLenum pname, GLint param )
 609 {
 610    _mesa_PixelTransferf( pname, (GLfloat) param );
 611 }
 612
 613
 614
 615 /**********************************************************************/
 616 /*****                    State Management                        *****/
 617 /**********************************************************************/
 618
 619 /*
 620  * Return a bitmask of IMAGE_*_BIT flags which to indicate which
 621  * pixel transfer operations are enabled.
 622  */
 623 static void
 624 update_image_transfer_state(struct gl_context *ctx)
 625 {
 626    GLuint mask = 0;
 627
 628    if (ctx->Pixel.RedScale   != 1.0F || ctx->Pixel.RedBias   != 0.0F ||
 629        ctx->Pixel.GreenScale != 1.0F || ctx->Pixel.GreenBias != 0.0F ||
 630        ctx->Pixel.BlueScale  != 1.0F || ctx->Pixel.BlueBias  != 0.0F ||
 631        ctx->Pixel.AlphaScale != 1.0F || ctx->Pixel.AlphaBias != 0.0F)
 632       mask |= IMAGE_SCALE_BIAS_BIT;
 633
 634    if (ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset)
 635       mask |= IMAGE_SHIFT_OFFSET_BIT;
 636
 637    if (ctx->Pixel.MapColorFlag)
 638       mask |= IMAGE_MAP_COLOR_BIT;
 639
 640    ctx->_ImageTransferState = mask;
 641 }
 642
 643
 644 /**
 645  * Update mesa pixel transfer derived state.
 646  */
 647 void _mesa_update_pixel( struct gl_context *ctx, GLuint new_state )
 648 {
 649    if (new_state & _NEW_PIXEL)
 650       update_image_transfer_state(ctx);
 651 }
 652
 653
 654 void
 655 _mesa_init_pixel_dispatch(struct _glapi_table *disp)
 656 {
 657    SET_GetPixelMapfv(disp, _mesa_GetPixelMapfv);
 658    SET_GetPixelMapuiv(disp, _mesa_GetPixelMapuiv);
 659    SET_GetPixelMapusv(disp, _mesa_GetPixelMapusv);
 660    SET_PixelMapfv(disp, _mesa_PixelMapfv);
 661    SET_PixelMapuiv(disp, _mesa_PixelMapuiv);
 662    SET_PixelMapusv(disp, _mesa_PixelMapusv);
 663    SET_PixelTransferf(disp, _mesa_PixelTransferf);
 664    SET_PixelTransferi(disp, _mesa_PixelTransferi);
 665    SET_PixelZoom(disp, _mesa_PixelZoom);
 666
 667    /* GL_ARB_robustness */
 668    SET_GetnPixelMapfvARB(disp, _mesa_GetnPixelMapfvARB);
 669    SET_GetnPixelMapuivARB(disp, _mesa_GetnPixelMapuivARB);
 670    SET_GetnPixelMapusvARB(disp, _mesa_GetnPixelMapusvARB);
 671 }
 672
 673
 674 #endif /* FEATURE_pixel_transfer */
 675
 676
 677 /**********************************************************************/
 678 /*****                      Initialization                        *****/
 679 /**********************************************************************/
 680
 681 static void
 682 init_pixelmap(struct gl_pixelmap *map)
 683 {
 684    map->Size = 1;
 685    map->Map[0] = 0.0;
 686    map->Map8[0] = 0;
 687 }
 688
 689
 690 /**
 691  * Initialize the context's PIXEL attribute group.
 692  */
 693 void
 694 _mesa_init_pixel( struct gl_context *ctx )
 695 {
 696    /* Pixel group */
 697    ctx->Pixel.RedBias = 0.0;
 698    ctx->Pixel.RedScale = 1.0;
 699    ctx->Pixel.GreenBias = 0.0;
 700    ctx->Pixel.GreenScale = 1.0;
 701    ctx->Pixel.BlueBias = 0.0;
 702    ctx->Pixel.BlueScale = 1.0;
 703    ctx->Pixel.AlphaBias = 0.0;
 704    ctx->Pixel.AlphaScale = 1.0;
 705    ctx->Pixel.DepthBias = 0.0;
 706    ctx->Pixel.DepthScale = 1.0;
 707    ctx->Pixel.IndexOffset = 0;
 708    ctx->Pixel.IndexShift = 0;
 709    ctx->Pixel.ZoomX = 1.0;
 710    ctx->Pixel.ZoomY = 1.0;
 711    ctx->Pixel.MapColorFlag = GL_FALSE;
 712    ctx->Pixel.MapStencilFlag = GL_FALSE;
 713    init_pixelmap(&ctx->PixelMaps.StoS);
 714    init_pixelmap(&ctx->PixelMaps.ItoI);
 715    init_pixelmap(&ctx->PixelMaps.ItoR);
 716    init_pixelmap(&ctx->PixelMaps.ItoG);
 717    init_pixelmap(&ctx->PixelMaps.ItoB);
 718    init_pixelmap(&ctx->PixelMaps.ItoA);
 719    init_pixelmap(&ctx->PixelMaps.RtoR);
 720    init_pixelmap(&ctx->PixelMaps.GtoG);
 721    init_pixelmap(&ctx->PixelMaps.BtoB);
 722    init_pixelmap(&ctx->PixelMaps.AtoA);
 723
 724    if (ctx->Visual.doubleBufferMode) {
 725       ctx->Pixel.ReadBuffer = GL_BACK;
 726    }
 727    else {
 728       ctx->Pixel.ReadBuffer = GL_FRONT;
 729    }
 730
 731    /* Miscellaneous */
 732    ctx->_ImageTransferState = 0;
 733 }