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_fixedfunc_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_STATE);
  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_fixedfunc_texture_unit *texUnit,
  92               const GLfloat *color)
  93 {
  94    if (TEST_EQ_4V(color, texUnit->EnvColorUnclamped))
  95       return;
  96    FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
  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_fixedfunc_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_STATE);
 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_STATE);
 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_fixedfunc_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_STATE);
 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_fixedfunc_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_STATE);
 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_fixedfunc_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_STATE);
 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_STATE);
 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    GLuint maxUnit;
 390    GET_CURRENT_CONTEXT(ctx);
 391
 392    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 393       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 394    if (ctx->Texture.CurrentUnit >= maxUnit) {
 395       _mesa_error(ctx, GL_INVALID_OPERATION, "glTexEnvfv(current unit)");
 396       return;
 397    }
 398
 399    if (target == GL_TEXTURE_ENV) {
 400       struct gl_fixedfunc_texture_unit *texUnit =
 401          _mesa_get_current_fixedfunc_tex_unit(ctx);
 402
 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       struct gl_texture_unit *texUnit =
 445          _mesa_get_current_tex_unit(ctx);
 446
 447       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 448          if (texUnit->LodBias == param[0])
 449             return;
 450          FLUSH_VERTICES(ctx, _NEW_TEXTURE_OBJECT);
 451          texUnit->LodBias = param[0];
 452       }
 453       else {
 454          TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 455          return;
 456       }
 457    }
 458    else if (target == GL_POINT_SPRITE_NV) {
 459       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 460       if (!ctx->Extensions.NV_point_sprite
 461           && !ctx->Extensions.ARB_point_sprite) {
 462          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
 463          return;
 464       }
 465       if (pname == GL_COORD_REPLACE_NV) {
 466          /* It's kind of weird to set point state via glTexEnv,
 467           * but that's what the spec calls for.
 468           */
 469          if (iparam0 == GL_TRUE) {
 470             if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
 471                return;
 472             ctx->Point.CoordReplace |= (1u << ctx->Texture.CurrentUnit);
 473          } else if (iparam0 == GL_FALSE) {
 474             if (~(ctx->Point.CoordReplace) & (1u << ctx->Texture.CurrentUnit))
 475                return;
 476             ctx->Point.CoordReplace &= ~(1u << ctx->Texture.CurrentUnit);
 477          } else {
 478             _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", iparam0);
 479             return;
 480          }
 481          FLUSH_VERTICES(ctx, _NEW_POINT);
 482       }
 483       else {
 484          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
 485          return;
 486       }
 487    }
 488    else {
 489       _mesa_error(ctx, GL_INVALID_ENUM, "glTexEnv(target=%s)",
 490                   _mesa_enum_to_string(target));
 491       return;
 492    }
 493
 494    if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
 495       _mesa_debug(ctx, "glTexEnv %s %s %.1f(%s) ...\n",
 496                   _mesa_enum_to_string(target),
 497                   _mesa_enum_to_string(pname),
 498                   *param,
 499                   _mesa_enum_to_string((GLenum) iparam0));
 500
 501    /* Tell device driver about the new texture environment */
 502    if (ctx->Driver.TexEnv) {
 503       ctx->Driver.TexEnv(ctx, target, pname, param);
 504    }
 505 }
 506
 507
 508 void GLAPIENTRY
 509 _mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
 510 {
 511    GLfloat p[4];
 512    p[0] = param;
 513    p[1] = p[2] = p[3] = 0.0;
 514    _mesa_TexEnvfv( target, pname, p );
 515 }
 516
 517
 518
 519 void GLAPIENTRY
 520 _mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
 521 {
 522    GLfloat p[4];
 523    p[0] = (GLfloat) param;
 524    p[1] = p[2] = p[3] = 0.0;
 525    _mesa_TexEnvfv( target, pname, p );
 526 }
 527
 528
 529 void GLAPIENTRY
 530 _mesa_TexEnviv( GLenum target, GLenum pname, const GLint *param )
 531 {
 532    GLfloat p[4];
 533    if (pname == GL_TEXTURE_ENV_COLOR) {
 534       p[0] = INT_TO_FLOAT( param[0] );
 535       p[1] = INT_TO_FLOAT( param[1] );
 536       p[2] = INT_TO_FLOAT( param[2] );
 537       p[3] = INT_TO_FLOAT( param[3] );
 538    }
 539    else {
 540       p[0] = (GLfloat) param[0];
 541       p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
 542    }
 543    _mesa_TexEnvfv( target, pname, p );
 544 }
 545
 546
 547
 548 /**
 549  * Helper for glGetTexEnvi/f()
 550  * \return  value of queried pname or -1 if error.
 551  */
 552 static GLint
 553 get_texenvi(struct gl_context *ctx,
 554             const struct gl_fixedfunc_texture_unit *texUnit,
 555             GLenum pname)
 556 {
 557    switch (pname) {
 558    case GL_TEXTURE_ENV_MODE:
 559       return texUnit->EnvMode;
 560       break;
 561    case GL_COMBINE_RGB:
 562       return texUnit->Combine.ModeRGB;
 563    case GL_COMBINE_ALPHA:
 564       return texUnit->Combine.ModeA;
 565    case GL_SOURCE0_RGB:
 566    case GL_SOURCE1_RGB:
 567    case GL_SOURCE2_RGB: {
 568       const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
 569       return texUnit->Combine.SourceRGB[rgb_idx];
 570    }
 571    case GL_SOURCE3_RGB_NV:
 572       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 573          return texUnit->Combine.SourceRGB[3];
 574       }
 575       else {
 576          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 577       }
 578       break;
 579    case GL_SOURCE0_ALPHA:
 580    case GL_SOURCE1_ALPHA:
 581    case GL_SOURCE2_ALPHA: {
 582       const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
 583       return texUnit->Combine.SourceA[alpha_idx];
 584    }
 585    case GL_SOURCE3_ALPHA_NV:
 586       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 587          return texUnit->Combine.SourceA[3];
 588       }
 589       else {
 590          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 591       }
 592       break;
 593    case GL_OPERAND0_RGB:
 594    case GL_OPERAND1_RGB:
 595    case GL_OPERAND2_RGB: {
 596       const unsigned op_rgb = pname - GL_OPERAND0_RGB;
 597       return texUnit->Combine.OperandRGB[op_rgb];
 598    }
 599    case GL_OPERAND3_RGB_NV:
 600       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 601          return texUnit->Combine.OperandRGB[3];
 602       }
 603       else {
 604          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 605       }
 606       break;
 607    case GL_OPERAND0_ALPHA:
 608    case GL_OPERAND1_ALPHA:
 609    case GL_OPERAND2_ALPHA: {
 610       const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
 611       return texUnit->Combine.OperandA[op_alpha];
 612    }
 613    case GL_OPERAND3_ALPHA_NV:
 614       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 615          return texUnit->Combine.OperandA[3];
 616       }
 617       else {
 618          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 619       }
 620       break;
 621    case GL_RGB_SCALE:
 622       return 1 << texUnit->Combine.ScaleShiftRGB;
 623    case GL_ALPHA_SCALE:
 624       return 1 << texUnit->Combine.ScaleShiftA;
 625    default:
 626       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 627       break;
 628    }
 629
 630    return -1; /* error */
 631 }
 632
 633
 634
 635 void GLAPIENTRY
 636 _mesa_GetTexEnvfv( GLenum target, GLenum pname, GLfloat *params )
 637 {
 638    GLuint maxUnit;
 639    GET_CURRENT_CONTEXT(ctx);
 640
 641    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 642       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 643    if (ctx->Texture.CurrentUnit >= maxUnit) {
 644       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnvfv(current unit)");
 645       return;
 646    }
 647
 648    if (target == GL_TEXTURE_ENV) {
 649       struct gl_fixedfunc_texture_unit *texUnit =
 650          _mesa_get_current_fixedfunc_tex_unit(ctx);
 651
 652       if (pname == GL_TEXTURE_ENV_COLOR) {
 653          if(ctx->NewState & (_NEW_BUFFERS | _NEW_FRAG_CLAMP))
 654             _mesa_update_state(ctx);
 655          if (_mesa_get_clamp_fragment_color(ctx, ctx->DrawBuffer))
 656             COPY_4FV( params, texUnit->EnvColor );
 657          else
 658             COPY_4FV( params, texUnit->EnvColorUnclamped );
 659       }
 660       else {
 661          GLint val = get_texenvi(ctx, texUnit, pname);
 662          if (val >= 0) {
 663             *params = (GLfloat) val;
 664          }
 665       }
 666    }
 667    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 668       const struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 669
 670       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 671          *params = texUnit->LodBias;
 672       }
 673       else {
 674          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 675          return;
 676       }
 677    }
 678    else if (target == GL_POINT_SPRITE_NV) {
 679       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 680       if (!ctx->Extensions.NV_point_sprite
 681           && !ctx->Extensions.ARB_point_sprite) {
 682          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 683          return;
 684       }
 685       if (pname == GL_COORD_REPLACE_NV) {
 686          if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
 687             *params = 1.0f;
 688          else
 689             *params = 0.0f;
 690       }
 691       else {
 692          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 693          return;
 694       }
 695    }
 696    else {
 697       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 698       return;
 699    }
 700 }
 701
 702
 703 void GLAPIENTRY
 704 _mesa_GetTexEnviv( GLenum target, GLenum pname, GLint *params )
 705 {
 706    GLuint maxUnit;
 707    GET_CURRENT_CONTEXT(ctx);
 708
 709    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 710       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 711    if (ctx->Texture.CurrentUnit >= maxUnit) {
 712       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnviv(current unit)");
 713       return;
 714    }
 715
 716    if (target == GL_TEXTURE_ENV) {
 717       struct gl_fixedfunc_texture_unit *texUnit =
 718          _mesa_get_current_fixedfunc_tex_unit(ctx);
 719
 720       if (pname == GL_TEXTURE_ENV_COLOR) {
 721          params[0] = FLOAT_TO_INT( texUnit->EnvColor[0] );
 722          params[1] = FLOAT_TO_INT( texUnit->EnvColor[1] );
 723          params[2] = FLOAT_TO_INT( texUnit->EnvColor[2] );
 724          params[3] = FLOAT_TO_INT( texUnit->EnvColor[3] );
 725       }
 726       else {
 727          GLint val = get_texenvi(ctx, texUnit, pname);
 728          if (val >= 0) {
 729             *params = val;
 730          }
 731       }
 732    }
 733    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 734       const struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 735
 736       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 737          *params = (GLint) texUnit->LodBias;
 738       }
 739       else {
 740          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 741          return;
 742       }
 743    }
 744    else if (target == GL_POINT_SPRITE_NV) {
 745       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 746       if (!ctx->Extensions.NV_point_sprite
 747           && !ctx->Extensions.ARB_point_sprite) {
 748          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 749          return;
 750       }
 751       if (pname == GL_COORD_REPLACE_NV) {
 752          if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
 753             *params = GL_TRUE;
 754          else
 755             *params = GL_FALSE;
 756       }
 757       else {
 758          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 759          return;
 760       }
 761    }
 762    else {
 763       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 764       return;
 765    }
 766 }
 767