src/mesa/main/texenv.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2009  VMware, Inc.  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  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /**
  27  * \file texenv.c
  28  *
  29  * glTexEnv-related functions
  30  */
  31
  32
  33 #include "main/glheader.h"
  34 #include "main/context.h"
  35 #include "main/blend.h"
  36 #include "main/enums.h"
  37 #include "main/macros.h"
  38 #include "main/mtypes.h"
  39 #include "main/state.h"
  40 #include "main/texenv.h"
  41 #include "main/texstate.h"
  42
  43
  44 #define TE_ERROR(errCode, msg, value)                           \
  45    _mesa_error(ctx, errCode, msg, _mesa_enum_to_string(value));
  46
  47
  48 /** Set texture env mode */
  49 static void
  50 set_env_mode(struct gl_context *ctx,
  51              struct gl_texture_unit *texUnit,
  52              GLenum mode)
  53 {
  54    GLboolean legal;
  55
  56    if (texUnit->EnvMode == mode)
  57       return;
  58
  59    switch (mode) {
  60    case GL_MODULATE:
  61    case GL_BLEND:
  62    case GL_DECAL:
  63    case GL_REPLACE:
  64    case GL_ADD:
  65    case GL_COMBINE:
  66       legal = GL_TRUE;
  67       break;
  68    case GL_REPLACE_EXT:
  69       mode = GL_REPLACE; /* GL_REPLACE_EXT != GL_REPLACE */
  70       legal = GL_TRUE;
  71       break;
  72    case GL_COMBINE4_NV:
  73       legal = ctx->Extensions.NV_texture_env_combine4;
  74       break;
  75    default:
  76       legal = GL_FALSE;
  77    }
  78
  79    if (legal) {
  80       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
  81       texUnit->EnvMode = mode;
  82    }
  83    else {
  84       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
  85    }
  86 }
  87
  88
  89 static void
  90 set_env_color(struct gl_context *ctx,
  91               struct gl_texture_unit *texUnit,
  92               const GLfloat *color)
  93 {
  94    if (TEST_EQ_4V(color, texUnit->EnvColorUnclamped))
  95       return;
  96    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
  97    COPY_4FV(texUnit->EnvColorUnclamped, color);
  98    texUnit->EnvColor[0] = CLAMP(color[0], 0.0F, 1.0F);
  99    texUnit->EnvColor[1] = CLAMP(color[1], 0.0F, 1.0F);
 100    texUnit->EnvColor[2] = CLAMP(color[2], 0.0F, 1.0F);
 101    texUnit->EnvColor[3] = CLAMP(color[3], 0.0F, 1.0F);
 102 }
 103
 104
 105 /** Set an RGB or A combiner mode/function */
 106 static void
 107 set_combiner_mode(struct gl_context *ctx,
 108                   struct gl_texture_unit *texUnit,
 109                   GLenum pname, GLenum mode)
 110 {
 111    GLboolean legal;
 112
 113    switch (mode) {
 114    case GL_REPLACE:
 115    case GL_MODULATE:
 116    case GL_ADD:
 117    case GL_ADD_SIGNED:
 118    case GL_INTERPOLATE:
 119       legal = GL_TRUE;
 120       break;
 121    case GL_SUBTRACT:
 122       legal = ctx->Extensions.ARB_texture_env_combine;
 123       break;
 124    case GL_DOT3_RGB_EXT:
 125    case GL_DOT3_RGBA_EXT:
 126       legal = (ctx->API == API_OPENGL_COMPAT &&
 127                ctx->Extensions.EXT_texture_env_dot3 &&
 128                pname == GL_COMBINE_RGB);
 129       break;
 130    case GL_DOT3_RGB:
 131    case GL_DOT3_RGBA:
 132       legal = (ctx->Extensions.ARB_texture_env_dot3 &&
 133                pname == GL_COMBINE_RGB);
 134       break;
 135    case GL_MODULATE_ADD_ATI:
 136    case GL_MODULATE_SIGNED_ADD_ATI:
 137    case GL_MODULATE_SUBTRACT_ATI:
 138       legal = (ctx->API == API_OPENGL_COMPAT &&
 139                ctx->Extensions.ATI_texture_env_combine3);
 140       break;
 141    default:
 142       legal = GL_FALSE;
 143    }
 144
 145    if (!legal) {
 146       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
 147       return;
 148    }
 149
 150    switch (pname) {
 151    case GL_COMBINE_RGB:
 152       if (texUnit->Combine.ModeRGB == mode)
 153          return;
 154       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 155       texUnit->Combine.ModeRGB = mode;
 156       break;
 157
 158    case GL_COMBINE_ALPHA:
 159       if (texUnit->Combine.ModeA == mode)
 160          return;
 161       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 162       texUnit->Combine.ModeA = mode;
 163       break;
 164    default:
 165       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 166    }
 167 }
 168
 169
 170
 171 /** Set an RGB or A combiner source term */
 172 static void
 173 set_combiner_source(struct gl_context *ctx,
 174                     struct gl_texture_unit *texUnit,
 175                     GLenum pname, GLenum param)
 176 {
 177    GLuint term;
 178    GLboolean alpha, legal;
 179
 180    /*
 181     * Translate pname to (term, alpha).
 182     *
 183     * The enums were given sequential values for a reason.
 184     */
 185    switch (pname) {
 186    case GL_SOURCE0_RGB:
 187    case GL_SOURCE1_RGB:
 188    case GL_SOURCE2_RGB:
 189    case GL_SOURCE3_RGB_NV:
 190       term = pname - GL_SOURCE0_RGB;
 191       alpha = GL_FALSE;
 192       break;
 193    case GL_SOURCE0_ALPHA:
 194    case GL_SOURCE1_ALPHA:
 195    case GL_SOURCE2_ALPHA:
 196    case GL_SOURCE3_ALPHA_NV:
 197       term = pname - GL_SOURCE0_ALPHA;
 198       alpha = GL_TRUE;
 199       break;
 200    default:
 201       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 202       return;
 203    }
 204
 205    if ((term == 3) && (ctx->API != API_OPENGL_COMPAT
 206                        || !ctx->Extensions.NV_texture_env_combine4)) {
 207       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 208       return;
 209    }
 210
 211    assert(term < MAX_COMBINER_TERMS);
 212
 213    /*
 214     * Error-check param (the source term)
 215     */
 216    switch (param) {
 217    case GL_TEXTURE:
 218    case GL_CONSTANT:
 219    case GL_PRIMARY_COLOR:
 220    case GL_PREVIOUS:
 221       legal = GL_TRUE;
 222       break;
 223    case GL_TEXTURE0:
 224    case GL_TEXTURE1:
 225    case GL_TEXTURE2:
 226    case GL_TEXTURE3:
 227    case GL_TEXTURE4:
 228    case GL_TEXTURE5:
 229    case GL_TEXTURE6:
 230    case GL_TEXTURE7:
 231       legal = (ctx->Extensions.ARB_texture_env_crossbar &&
 232                param - GL_TEXTURE0 < ctx->Const.MaxTextureUnits);
 233       break;
 234    case GL_ZERO:
 235       legal = (ctx->API == API_OPENGL_COMPAT &&
 236                (ctx->Extensions.ATI_texture_env_combine3 ||
 237                 ctx->Extensions.NV_texture_env_combine4));
 238       break;
 239    case GL_ONE:
 240       legal = (ctx->API == API_OPENGL_COMPAT &&
 241                ctx->Extensions.ATI_texture_env_combine3);
 242       break;
 243    default:
 244       legal = GL_FALSE;
 245    }
 246
 247    if (!legal) {
 248       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", param);
 249       return;
 250    }
 251
 252    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 253
 254    if (alpha)
 255       texUnit->Combine.SourceA[term] = param;
 256    else
 257       texUnit->Combine.SourceRGB[term] = param;
 258 }
 259
 260
 261 /** Set an RGB or A combiner operand term */
 262 static void
 263 set_combiner_operand(struct gl_context *ctx,
 264                      struct gl_texture_unit *texUnit,
 265                      GLenum pname, GLenum param)
 266 {
 267    GLuint term;
 268    GLboolean alpha, legal;
 269
 270    /* The enums were given sequential values for a reason.
 271     */
 272    switch (pname) {
 273    case GL_OPERAND0_RGB:
 274    case GL_OPERAND1_RGB:
 275    case GL_OPERAND2_RGB:
 276    case GL_OPERAND3_RGB_NV:
 277       term = pname - GL_OPERAND0_RGB;
 278       alpha = GL_FALSE;
 279       break;
 280    case GL_OPERAND0_ALPHA:
 281    case GL_OPERAND1_ALPHA:
 282    case GL_OPERAND2_ALPHA:
 283    case GL_OPERAND3_ALPHA_NV:
 284       term = pname - GL_OPERAND0_ALPHA;
 285       alpha = GL_TRUE;
 286       break;
 287    default:
 288       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 289       return;
 290    }
 291
 292    if ((term == 3) && (ctx->API != API_OPENGL_COMPAT
 293                        || !ctx->Extensions.NV_texture_env_combine4)) {
 294       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 295       return;
 296    }
 297
 298    assert(term < MAX_COMBINER_TERMS);
 299
 300    /*
 301     * Error-check param (the source operand)
 302     */
 303    switch (param) {
 304    case GL_SRC_COLOR:
 305    case GL_ONE_MINUS_SRC_COLOR:
 306       /* The color input can only be used with GL_OPERAND[01]_RGB in the EXT
 307        * version.  In the ARB and NV versions and OpenGL ES 1.x they can be
 308        * used for any RGB operand.
 309        */
 310       legal = !alpha
 311          && ((term < 2) || ctx->Extensions.ARB_texture_env_combine
 312              || ctx->Extensions.NV_texture_env_combine4);
 313       break;
 314    case GL_ONE_MINUS_SRC_ALPHA:
 315       /* GL_ONE_MINUS_SRC_ALPHA can only be used with
 316        * GL_OPERAND[01]_(RGB|ALPHA) in the EXT version.  In the ARB and NV
 317        * versions and OpenGL ES 1.x it can be used for any operand.
 318        */
 319       legal = (term < 2) || ctx->Extensions.ARB_texture_env_combine
 320          || ctx->Extensions.NV_texture_env_combine4;
 321       break;
 322    case GL_SRC_ALPHA:
 323       legal = GL_TRUE;
 324       break;
 325    default:
 326       legal = GL_FALSE;
 327    }
 328
 329    if (!legal) {
 330       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", param);
 331       return;
 332    }
 333
 334    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 335
 336    if (alpha)
 337       texUnit->Combine.OperandA[term] = param;
 338    else
 339       texUnit->Combine.OperandRGB[term] = param;
 340 }
 341
 342
 343 static void
 344 set_combiner_scale(struct gl_context *ctx,
 345                    struct gl_texture_unit *texUnit,
 346                    GLenum pname, GLfloat scale)
 347 {
 348    GLuint shift;
 349
 350    if (scale == 1.0F) {
 351       shift = 0;
 352    }
 353    else if (scale == 2.0F) {
 354       shift = 1;
 355    }
 356    else if (scale == 4.0F) {
 357       shift = 2;
 358    }
 359    else {
 360       _mesa_error( ctx, GL_INVALID_VALUE,
 361                    "glTexEnv(GL_RGB_SCALE not 1, 2 or 4)" );
 362       return;
 363    }
 364
 365    switch (pname) {
 366    case GL_RGB_SCALE:
 367       if (texUnit->Combine.ScaleShiftRGB == shift)
 368          return;
 369       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 370       texUnit->Combine.ScaleShiftRGB = shift;
 371       break;
 372    case GL_ALPHA_SCALE:
 373       if (texUnit->Combine.ScaleShiftA == shift)
 374          return;
 375       FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 376       texUnit->Combine.ScaleShiftA = shift;
 377       break;
 378    default:
 379       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 380    }
 381 }
 382
 383
 384
 385 void GLAPIENTRY
 386 _mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
 387 {
 388    const GLint iparam0 = (GLint) param[0];
 389    struct gl_texture_unit *texUnit;
 390    GLuint maxUnit;
 391    GET_CURRENT_CONTEXT(ctx);
 392
 393    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 394       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 395    if (ctx->Texture.CurrentUnit >= maxUnit) {
 396       _mesa_error(ctx, GL_INVALID_OPERATION, "glTexEnvfv(current unit)");
 397       return;
 398    }
 399
 400    texUnit = _mesa_get_current_tex_unit(ctx);
 401
 402    if (target == GL_TEXTURE_ENV) {
 403       switch (pname) {
 404       case GL_TEXTURE_ENV_MODE:
 405          set_env_mode(ctx, texUnit, (GLenum) iparam0);
 406          break;
 407       case GL_TEXTURE_ENV_COLOR:
 408          set_env_color(ctx, texUnit, param);
 409          break;
 410       case GL_COMBINE_RGB:
 411       case GL_COMBINE_ALPHA:
 412          set_combiner_mode(ctx, texUnit, pname, (GLenum) iparam0);
 413          break;
 414       case GL_SOURCE0_RGB:
 415       case GL_SOURCE1_RGB:
 416       case GL_SOURCE2_RGB:
 417       case GL_SOURCE3_RGB_NV:
 418       case GL_SOURCE0_ALPHA:
 419       case GL_SOURCE1_ALPHA:
 420       case GL_SOURCE2_ALPHA:
 421       case GL_SOURCE3_ALPHA_NV:
 422          set_combiner_source(ctx, texUnit, pname, (GLenum) iparam0);
 423          break;
 424       case GL_OPERAND0_RGB:
 425       case GL_OPERAND1_RGB:
 426       case GL_OPERAND2_RGB:
 427       case GL_OPERAND3_RGB_NV:
 428       case GL_OPERAND0_ALPHA:
 429       case GL_OPERAND1_ALPHA:
 430       case GL_OPERAND2_ALPHA:
 431       case GL_OPERAND3_ALPHA_NV:
 432          set_combiner_operand(ctx, texUnit, pname, (GLenum) iparam0);
 433          break;
 434       case GL_RGB_SCALE:
 435       case GL_ALPHA_SCALE:
 436          set_combiner_scale(ctx, texUnit, pname, param[0]);
 437          break;
 438       default:
 439          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
 440          return;
 441       }
 442    }
 443    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 444       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 445          if (texUnit->LodBias == param[0])
 446             return;
 447          FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 448          texUnit->LodBias = param[0];
 449       }
 450       else {
 451          TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 452          return;
 453       }
 454    }
 455    else if (target == GL_POINT_SPRITE_NV) {
 456       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 457       if (!ctx->Extensions.NV_point_sprite
 458           && !ctx->Extensions.ARB_point_sprite) {
 459          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
 460          return;
 461       }
 462       if (pname == GL_COORD_REPLACE_NV) {
 463          if (iparam0 == GL_TRUE || iparam0 == GL_FALSE) {
 464             /* It's kind of weird to set point state via glTexEnv,
 465              * but that's what the spec calls for.
 466              */
 467             const GLboolean state = (GLboolean) iparam0;
 468             if (ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] == state)
 469                return;
 470             FLUSH_VERTICES(ctx, _NEW_POINT);
 471             ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] = state;
 472          }
 473          else {
 474             _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", iparam0);
 475             return;
 476          }
 477       }
 478       else {
 479          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
 480          return;
 481       }
 482    }
 483    else {
 484       _mesa_error(ctx, GL_INVALID_ENUM, "glTexEnv(target=%s)",
 485                   _mesa_enum_to_string(target));
 486       return;
 487    }
 488
 489    if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
 490       _mesa_debug(ctx, "glTexEnv %s %s %.1f(%s) ...\n",
 491                   _mesa_enum_to_string(target),
 492                   _mesa_enum_to_string(pname),
 493                   *param,
 494                   _mesa_enum_to_string((GLenum) iparam0));
 495
 496    /* Tell device driver about the new texture environment */
 497    if (ctx->Driver.TexEnv) {
 498       ctx->Driver.TexEnv(ctx, target, pname, param);
 499    }
 500 }
 501
 502
 503 void GLAPIENTRY
 504 _mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
 505 {
 506    GLfloat p[4];
 507    p[0] = param;
 508    p[1] = p[2] = p[3] = 0.0;
 509    _mesa_TexEnvfv( target, pname, p );
 510 }
 511
 512
 513
 514 void GLAPIENTRY
 515 _mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
 516 {
 517    GLfloat p[4];
 518    p[0] = (GLfloat) param;
 519    p[1] = p[2] = p[3] = 0.0;
 520    _mesa_TexEnvfv( target, pname, p );
 521 }
 522
 523
 524 void GLAPIENTRY
 525 _mesa_TexEnviv( GLenum target, GLenum pname, const GLint *param )
 526 {
 527    GLfloat p[4];
 528    if (pname == GL_TEXTURE_ENV_COLOR) {
 529       p[0] = INT_TO_FLOAT( param[0] );
 530       p[1] = INT_TO_FLOAT( param[1] );
 531       p[2] = INT_TO_FLOAT( param[2] );
 532       p[3] = INT_TO_FLOAT( param[3] );
 533    }
 534    else {
 535       p[0] = (GLfloat) param[0];
 536       p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
 537    }
 538    _mesa_TexEnvfv( target, pname, p );
 539 }
 540
 541
 542
 543 /**
 544  * Helper for glGetTexEnvi/f()
 545  * \return  value of queried pname or -1 if error.
 546  */
 547 static GLint
 548 get_texenvi(struct gl_context *ctx, const struct gl_texture_unit *texUnit,
 549             GLenum pname)
 550 {
 551    switch (pname) {
 552    case GL_TEXTURE_ENV_MODE:
 553       return texUnit->EnvMode;
 554       break;
 555    case GL_COMBINE_RGB:
 556       return texUnit->Combine.ModeRGB;
 557    case GL_COMBINE_ALPHA:
 558       return texUnit->Combine.ModeA;
 559    case GL_SOURCE0_RGB:
 560    case GL_SOURCE1_RGB:
 561    case GL_SOURCE2_RGB: {
 562       const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
 563       return texUnit->Combine.SourceRGB[rgb_idx];
 564    }
 565    case GL_SOURCE3_RGB_NV:
 566       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 567          return texUnit->Combine.SourceRGB[3];
 568       }
 569       else {
 570          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 571       }
 572       break;
 573    case GL_SOURCE0_ALPHA:
 574    case GL_SOURCE1_ALPHA:
 575    case GL_SOURCE2_ALPHA: {
 576       const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
 577       return texUnit->Combine.SourceA[alpha_idx];
 578    }
 579    case GL_SOURCE3_ALPHA_NV:
 580       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 581          return texUnit->Combine.SourceA[3];
 582       }
 583       else {
 584          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 585       }
 586       break;
 587    case GL_OPERAND0_RGB:
 588    case GL_OPERAND1_RGB:
 589    case GL_OPERAND2_RGB: {
 590       const unsigned op_rgb = pname - GL_OPERAND0_RGB;
 591       return texUnit->Combine.OperandRGB[op_rgb];
 592    }
 593    case GL_OPERAND3_RGB_NV:
 594       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 595          return texUnit->Combine.OperandRGB[3];
 596       }
 597       else {
 598          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 599       }
 600       break;
 601    case GL_OPERAND0_ALPHA:
 602    case GL_OPERAND1_ALPHA:
 603    case GL_OPERAND2_ALPHA: {
 604       const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
 605       return texUnit->Combine.OperandA[op_alpha];
 606    }
 607    case GL_OPERAND3_ALPHA_NV:
 608       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 609          return texUnit->Combine.OperandA[3];
 610       }
 611       else {
 612          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 613       }
 614       break;
 615    case GL_RGB_SCALE:
 616       return 1 << texUnit->Combine.ScaleShiftRGB;
 617    case GL_ALPHA_SCALE:
 618       return 1 << texUnit->Combine.ScaleShiftA;
 619    default:
 620       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 621       break;
 622    }
 623
 624    return -1; /* error */
 625 }
 626
 627
 628
 629 void GLAPIENTRY
 630 _mesa_GetTexEnvfv( GLenum target, GLenum pname, GLfloat *params )
 631 {
 632    GLuint maxUnit;
 633    const struct gl_texture_unit *texUnit;
 634    GET_CURRENT_CONTEXT(ctx);
 635
 636    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 637       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 638    if (ctx->Texture.CurrentUnit >= maxUnit) {
 639       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnvfv(current unit)");
 640       return;
 641    }
 642
 643    texUnit = _mesa_get_current_tex_unit(ctx);
 644
 645    if (target == GL_TEXTURE_ENV) {
 646       if (pname == GL_TEXTURE_ENV_COLOR) {
 647          if(ctx->NewState & (_NEW_BUFFERS | _NEW_FRAG_CLAMP))
 648             _mesa_update_state(ctx);
 649          if (_mesa_get_clamp_fragment_color(ctx, ctx->DrawBuffer))
 650             COPY_4FV( params, texUnit->EnvColor );
 651          else
 652             COPY_4FV( params, texUnit->EnvColorUnclamped );
 653       }
 654       else {
 655          GLint val = get_texenvi(ctx, texUnit, pname);
 656          if (val >= 0) {
 657             *params = (GLfloat) val;
 658          }
 659       }
 660    }
 661    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 662       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 663          *params = texUnit->LodBias;
 664       }
 665       else {
 666          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 667          return;
 668       }
 669    }
 670    else if (target == GL_POINT_SPRITE_NV) {
 671       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 672       if (!ctx->Extensions.NV_point_sprite
 673           && !ctx->Extensions.ARB_point_sprite) {
 674          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 675          return;
 676       }
 677       if (pname == GL_COORD_REPLACE_NV) {
 678          *params = (GLfloat) ctx->Point.CoordReplace[ctx->Texture.CurrentUnit];
 679       }
 680       else {
 681          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 682          return;
 683       }
 684    }
 685    else {
 686       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 687       return;
 688    }
 689 }
 690
 691
 692 void GLAPIENTRY
 693 _mesa_GetTexEnviv( GLenum target, GLenum pname, GLint *params )
 694 {
 695    GLuint maxUnit;
 696    const struct gl_texture_unit *texUnit;
 697    GET_CURRENT_CONTEXT(ctx);
 698
 699    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 700       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 701    if (ctx->Texture.CurrentUnit >= maxUnit) {
 702       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnviv(current unit)");
 703       return;
 704    }
 705
 706    texUnit = _mesa_get_current_tex_unit(ctx);
 707
 708    if (target == GL_TEXTURE_ENV) {
 709       if (pname == GL_TEXTURE_ENV_COLOR) {
 710          params[0] = FLOAT_TO_INT( texUnit->EnvColor[0] );
 711          params[1] = FLOAT_TO_INT( texUnit->EnvColor[1] );
 712          params[2] = FLOAT_TO_INT( texUnit->EnvColor[2] );
 713          params[3] = FLOAT_TO_INT( texUnit->EnvColor[3] );
 714       }
 715       else {
 716          GLint val = get_texenvi(ctx, texUnit, pname);
 717          if (val >= 0) {
 718             *params = val;
 719          }
 720       }
 721    }
 722    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 723       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 724          *params = (GLint) texUnit->LodBias;
 725       }
 726       else {
 727          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 728          return;
 729       }
 730    }
 731    else if (target == GL_POINT_SPRITE_NV) {
 732       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 733       if (!ctx->Extensions.NV_point_sprite
 734           && !ctx->Extensions.ARB_point_sprite) {
 735          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 736          return;
 737       }
 738       if (pname == GL_COORD_REPLACE_NV) {
 739          *params = (GLint) ctx->Point.CoordReplace[ctx->Texture.CurrentUnit];
 740       }
 741       else {
 742          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 743          return;
 744       }
 745    }
 746    else {
 747       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 748       return;
 749    }
 750 }
 751