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          /* It's kind of weird to set point state via glTexEnv,
 464           * but that's what the spec calls for.
 465           */
 466          if (iparam0 == GL_TRUE) {
 467             if (ctx->Point.CoordReplaceBits & (1u << ctx->Texture.CurrentUnit))
 468                return;
 469             ctx->Point.CoordReplaceBits |= (1u << ctx->Texture.CurrentUnit);
 470             ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] = GL_TRUE;
 471          } else if (iparam0 == GL_FALSE) {
 472             if (~(ctx->Point.CoordReplaceBits) & (1u << ctx->Texture.CurrentUnit))
 473                return;
 474             ctx->Point.CoordReplaceBits &= ~(1u << ctx->Texture.CurrentUnit);
 475             ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] = GL_FALSE;
 476          } else {
 477             _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", iparam0);
 478             return;
 479          }
 480          FLUSH_VERTICES(ctx, _NEW_POINT);
 481       }
 482       else {
 483          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
 484          return;
 485       }
 486    }
 487    else {
 488       _mesa_error(ctx, GL_INVALID_ENUM, "glTexEnv(target=%s)",
 489                   _mesa_enum_to_string(target));
 490       return;
 491    }
 492
 493    if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
 494       _mesa_debug(ctx, "glTexEnv %s %s %.1f(%s) ...\n",
 495                   _mesa_enum_to_string(target),
 496                   _mesa_enum_to_string(pname),
 497                   *param,
 498                   _mesa_enum_to_string((GLenum) iparam0));
 499
 500    /* Tell device driver about the new texture environment */
 501    if (ctx->Driver.TexEnv) {
 502       ctx->Driver.TexEnv(ctx, target, pname, param);
 503    }
 504 }
 505
 506
 507 void GLAPIENTRY
 508 _mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
 509 {
 510    GLfloat p[4];
 511    p[0] = param;
 512    p[1] = p[2] = p[3] = 0.0;
 513    _mesa_TexEnvfv( target, pname, p );
 514 }
 515
 516
 517
 518 void GLAPIENTRY
 519 _mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
 520 {
 521    GLfloat p[4];
 522    p[0] = (GLfloat) param;
 523    p[1] = p[2] = p[3] = 0.0;
 524    _mesa_TexEnvfv( target, pname, p );
 525 }
 526
 527
 528 void GLAPIENTRY
 529 _mesa_TexEnviv( GLenum target, GLenum pname, const GLint *param )
 530 {
 531    GLfloat p[4];
 532    if (pname == GL_TEXTURE_ENV_COLOR) {
 533       p[0] = INT_TO_FLOAT( param[0] );
 534       p[1] = INT_TO_FLOAT( param[1] );
 535       p[2] = INT_TO_FLOAT( param[2] );
 536       p[3] = INT_TO_FLOAT( param[3] );
 537    }
 538    else {
 539       p[0] = (GLfloat) param[0];
 540       p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
 541    }
 542    _mesa_TexEnvfv( target, pname, p );
 543 }
 544
 545
 546
 547 /**
 548  * Helper for glGetTexEnvi/f()
 549  * \return  value of queried pname or -1 if error.
 550  */
 551 static GLint
 552 get_texenvi(struct gl_context *ctx, const struct gl_texture_unit *texUnit,
 553             GLenum pname)
 554 {
 555    switch (pname) {
 556    case GL_TEXTURE_ENV_MODE:
 557       return texUnit->EnvMode;
 558       break;
 559    case GL_COMBINE_RGB:
 560       return texUnit->Combine.ModeRGB;
 561    case GL_COMBINE_ALPHA:
 562       return texUnit->Combine.ModeA;
 563    case GL_SOURCE0_RGB:
 564    case GL_SOURCE1_RGB:
 565    case GL_SOURCE2_RGB: {
 566       const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
 567       return texUnit->Combine.SourceRGB[rgb_idx];
 568    }
 569    case GL_SOURCE3_RGB_NV:
 570       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 571          return texUnit->Combine.SourceRGB[3];
 572       }
 573       else {
 574          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 575       }
 576       break;
 577    case GL_SOURCE0_ALPHA:
 578    case GL_SOURCE1_ALPHA:
 579    case GL_SOURCE2_ALPHA: {
 580       const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
 581       return texUnit->Combine.SourceA[alpha_idx];
 582    }
 583    case GL_SOURCE3_ALPHA_NV:
 584       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 585          return texUnit->Combine.SourceA[3];
 586       }
 587       else {
 588          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 589       }
 590       break;
 591    case GL_OPERAND0_RGB:
 592    case GL_OPERAND1_RGB:
 593    case GL_OPERAND2_RGB: {
 594       const unsigned op_rgb = pname - GL_OPERAND0_RGB;
 595       return texUnit->Combine.OperandRGB[op_rgb];
 596    }
 597    case GL_OPERAND3_RGB_NV:
 598       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 599          return texUnit->Combine.OperandRGB[3];
 600       }
 601       else {
 602          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 603       }
 604       break;
 605    case GL_OPERAND0_ALPHA:
 606    case GL_OPERAND1_ALPHA:
 607    case GL_OPERAND2_ALPHA: {
 608       const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
 609       return texUnit->Combine.OperandA[op_alpha];
 610    }
 611    case GL_OPERAND3_ALPHA_NV:
 612       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 613          return texUnit->Combine.OperandA[3];
 614       }
 615       else {
 616          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 617       }
 618       break;
 619    case GL_RGB_SCALE:
 620       return 1 << texUnit->Combine.ScaleShiftRGB;
 621    case GL_ALPHA_SCALE:
 622       return 1 << texUnit->Combine.ScaleShiftA;
 623    default:
 624       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 625       break;
 626    }
 627
 628    return -1; /* error */
 629 }
 630
 631
 632
 633 void GLAPIENTRY
 634 _mesa_GetTexEnvfv( GLenum target, GLenum pname, GLfloat *params )
 635 {
 636    GLuint maxUnit;
 637    const struct gl_texture_unit *texUnit;
 638    GET_CURRENT_CONTEXT(ctx);
 639
 640    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 641       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 642    if (ctx->Texture.CurrentUnit >= maxUnit) {
 643       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnvfv(current unit)");
 644       return;
 645    }
 646
 647    texUnit = _mesa_get_current_tex_unit(ctx);
 648
 649    if (target == GL_TEXTURE_ENV) {
 650       if (pname == GL_TEXTURE_ENV_COLOR) {
 651          if(ctx->NewState & (_NEW_BUFFERS | _NEW_FRAG_CLAMP))
 652             _mesa_update_state(ctx);
 653          if (_mesa_get_clamp_fragment_color(ctx, ctx->DrawBuffer))
 654             COPY_4FV( params, texUnit->EnvColor );
 655          else
 656             COPY_4FV( params, texUnit->EnvColorUnclamped );
 657       }
 658       else {
 659          GLint val = get_texenvi(ctx, texUnit, pname);
 660          if (val >= 0) {
 661             *params = (GLfloat) val;
 662          }
 663       }
 664    }
 665    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 666       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 667          *params = texUnit->LodBias;
 668       }
 669       else {
 670          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 671          return;
 672       }
 673    }
 674    else if (target == GL_POINT_SPRITE_NV) {
 675       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 676       if (!ctx->Extensions.NV_point_sprite
 677           && !ctx->Extensions.ARB_point_sprite) {
 678          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 679          return;
 680       }
 681       if (pname == GL_COORD_REPLACE_NV) {
 682          if (ctx->Point.CoordReplaceBits & (1u << ctx->Texture.CurrentUnit))
 683             *params = 1.0f;
 684          else
 685             *params = 0.0f;
 686       }
 687       else {
 688          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 689          return;
 690       }
 691    }
 692    else {
 693       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 694       return;
 695    }
 696 }
 697
 698
 699 void GLAPIENTRY
 700 _mesa_GetTexEnviv( GLenum target, GLenum pname, GLint *params )
 701 {
 702    GLuint maxUnit;
 703    const struct gl_texture_unit *texUnit;
 704    GET_CURRENT_CONTEXT(ctx);
 705
 706    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 707       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 708    if (ctx->Texture.CurrentUnit >= maxUnit) {
 709       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnviv(current unit)");
 710       return;
 711    }
 712
 713    texUnit = _mesa_get_current_tex_unit(ctx);
 714
 715    if (target == GL_TEXTURE_ENV) {
 716       if (pname == GL_TEXTURE_ENV_COLOR) {
 717          params[0] = FLOAT_TO_INT( texUnit->EnvColor[0] );
 718          params[1] = FLOAT_TO_INT( texUnit->EnvColor[1] );
 719          params[2] = FLOAT_TO_INT( texUnit->EnvColor[2] );
 720          params[3] = FLOAT_TO_INT( texUnit->EnvColor[3] );
 721       }
 722       else {
 723          GLint val = get_texenvi(ctx, texUnit, pname);
 724          if (val >= 0) {
 725             *params = val;
 726          }
 727       }
 728    }
 729    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 730       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 731          *params = (GLint) texUnit->LodBias;
 732       }
 733       else {
 734          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 735          return;
 736       }
 737    }
 738    else if (target == GL_POINT_SPRITE_NV) {
 739       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 740       if (!ctx->Extensions.NV_point_sprite
 741           && !ctx->Extensions.ARB_point_sprite) {
 742          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 743          return;
 744       }
 745       if (pname == GL_COORD_REPLACE_NV) {
 746          if (ctx->Point.CoordReplaceBits & (1u << ctx->Texture.CurrentUnit))
 747             *params = GL_TRUE;
 748          else
 749             *params = GL_FALSE;
 750       }
 751       else {
 752          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 753          return;
 754       }
 755    }
 756    else {
 757       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 758       return;
 759    }
 760 }
 761