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 bool
 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 false;
 148    }
 149
 150    switch (pname) {
 151    case GL_COMBINE_RGB:
 152       if (texUnit->Combine.ModeRGB == mode)
 153          return true;
 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 true;
 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       return false;
 167    }
 168
 169    return true;
 170 }
 171
 172
 173
 174 /** Set an RGB or A combiner source term */
 175 static bool
 176 set_combiner_source(struct gl_context *ctx,
 177                     struct gl_fixedfunc_texture_unit *texUnit,
 178                     GLenum pname, GLenum param)
 179 {
 180    GLuint term;
 181    GLboolean alpha, legal;
 182
 183    /*
 184     * Translate pname to (term, alpha).
 185     *
 186     * The enums were given sequential values for a reason.
 187     */
 188    switch (pname) {
 189    case GL_SOURCE0_RGB:
 190    case GL_SOURCE1_RGB:
 191    case GL_SOURCE2_RGB:
 192    case GL_SOURCE3_RGB_NV:
 193       term = pname - GL_SOURCE0_RGB;
 194       alpha = GL_FALSE;
 195       break;
 196    case GL_SOURCE0_ALPHA:
 197    case GL_SOURCE1_ALPHA:
 198    case GL_SOURCE2_ALPHA:
 199    case GL_SOURCE3_ALPHA_NV:
 200       term = pname - GL_SOURCE0_ALPHA;
 201       alpha = GL_TRUE;
 202       break;
 203    default:
 204       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 205       return false;
 206    }
 207
 208    if ((term == 3) && (ctx->API != API_OPENGL_COMPAT
 209                        || !ctx->Extensions.NV_texture_env_combine4)) {
 210       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 211       return false;
 212    }
 213
 214    assert(term < MAX_COMBINER_TERMS);
 215
 216    /*
 217     * Error-check param (the source term)
 218     */
 219    switch (param) {
 220    case GL_TEXTURE:
 221    case GL_CONSTANT:
 222    case GL_PRIMARY_COLOR:
 223    case GL_PREVIOUS:
 224       legal = GL_TRUE;
 225       break;
 226    case GL_TEXTURE0:
 227    case GL_TEXTURE1:
 228    case GL_TEXTURE2:
 229    case GL_TEXTURE3:
 230    case GL_TEXTURE4:
 231    case GL_TEXTURE5:
 232    case GL_TEXTURE6:
 233    case GL_TEXTURE7:
 234       legal = (ctx->Extensions.ARB_texture_env_crossbar &&
 235                param - GL_TEXTURE0 < ctx->Const.MaxTextureUnits);
 236       break;
 237    case GL_ZERO:
 238       legal = (ctx->API == API_OPENGL_COMPAT &&
 239                (ctx->Extensions.ATI_texture_env_combine3 ||
 240                 ctx->Extensions.NV_texture_env_combine4));
 241       break;
 242    case GL_ONE:
 243       legal = (ctx->API == API_OPENGL_COMPAT &&
 244                ctx->Extensions.ATI_texture_env_combine3);
 245       break;
 246    default:
 247       legal = GL_FALSE;
 248    }
 249
 250    if (!legal) {
 251       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", param);
 252       return false;
 253    }
 254
 255    FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
 256
 257    if (alpha)
 258       texUnit->Combine.SourceA[term] = param;
 259    else
 260       texUnit->Combine.SourceRGB[term] = param;
 261
 262    return true;
 263 }
 264
 265
 266 /** Set an RGB or A combiner operand term */
 267 static bool
 268 set_combiner_operand(struct gl_context *ctx,
 269                      struct gl_fixedfunc_texture_unit *texUnit,
 270                      GLenum pname, GLenum param)
 271 {
 272    GLuint term;
 273    GLboolean alpha, legal;
 274
 275    /* The enums were given sequential values for a reason.
 276     */
 277    switch (pname) {
 278    case GL_OPERAND0_RGB:
 279    case GL_OPERAND1_RGB:
 280    case GL_OPERAND2_RGB:
 281    case GL_OPERAND3_RGB_NV:
 282       term = pname - GL_OPERAND0_RGB;
 283       alpha = GL_FALSE;
 284       break;
 285    case GL_OPERAND0_ALPHA:
 286    case GL_OPERAND1_ALPHA:
 287    case GL_OPERAND2_ALPHA:
 288    case GL_OPERAND3_ALPHA_NV:
 289       term = pname - GL_OPERAND0_ALPHA;
 290       alpha = GL_TRUE;
 291       break;
 292    default:
 293       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 294       return false;
 295    }
 296
 297    if ((term == 3) && (ctx->API != API_OPENGL_COMPAT
 298                        || !ctx->Extensions.NV_texture_env_combine4)) {
 299       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 300       return false;
 301    }
 302
 303    assert(term < MAX_COMBINER_TERMS);
 304
 305    /*
 306     * Error-check param (the source operand)
 307     */
 308    switch (param) {
 309    case GL_SRC_COLOR:
 310    case GL_ONE_MINUS_SRC_COLOR:
 311       /* The color input can only be used with GL_OPERAND[01]_RGB in the EXT
 312        * version.  In the ARB and NV versions and OpenGL ES 1.x they can be
 313        * used for any RGB operand.
 314        */
 315       legal = !alpha
 316          && ((term < 2) || ctx->Extensions.ARB_texture_env_combine
 317              || ctx->Extensions.NV_texture_env_combine4);
 318       break;
 319    case GL_ONE_MINUS_SRC_ALPHA:
 320       /* GL_ONE_MINUS_SRC_ALPHA can only be used with
 321        * GL_OPERAND[01]_(RGB|ALPHA) in the EXT version.  In the ARB and NV
 322        * versions and OpenGL ES 1.x it can be used for any operand.
 323        */
 324       legal = (term < 2) || ctx->Extensions.ARB_texture_env_combine
 325          || ctx->Extensions.NV_texture_env_combine4;
 326       break;
 327    case GL_SRC_ALPHA:
 328       legal = GL_TRUE;
 329       break;
 330    default:
 331       legal = GL_FALSE;
 332    }
 333
 334    if (!legal) {
 335       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", param);
 336       return false;
 337    }
 338
 339    FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
 340
 341    if (alpha)
 342       texUnit->Combine.OperandA[term] = param;
 343    else
 344       texUnit->Combine.OperandRGB[term] = param;
 345
 346    return true;
 347 }
 348
 349
 350 static bool
 351 set_combiner_scale(struct gl_context *ctx,
 352                    struct gl_fixedfunc_texture_unit *texUnit,
 353                    GLenum pname, GLfloat scale)
 354 {
 355    GLuint shift;
 356
 357    if (scale == 1.0F) {
 358       shift = 0;
 359    }
 360    else if (scale == 2.0F) {
 361       shift = 1;
 362    }
 363    else if (scale == 4.0F) {
 364       shift = 2;
 365    }
 366    else {
 367       _mesa_error( ctx, GL_INVALID_VALUE,
 368                    "glTexEnv(GL_RGB_SCALE not 1, 2 or 4)" );
 369       return false;
 370    }
 371
 372    switch (pname) {
 373    case GL_RGB_SCALE:
 374       if (texUnit->Combine.ScaleShiftRGB == shift)
 375          return true;
 376       FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
 377       texUnit->Combine.ScaleShiftRGB = shift;
 378       break;
 379    case GL_ALPHA_SCALE:
 380       if (texUnit->Combine.ScaleShiftA == shift)
 381          return true;
 382       FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
 383       texUnit->Combine.ScaleShiftA = shift;
 384       break;
 385    default:
 386       TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 387       return false;
 388    }
 389
 390    return true;
 391 }
 392
 393
 394
 395 void GLAPIENTRY
 396 _mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
 397 {
 398    const GLint iparam0 = (GLint) param[0];
 399    GLuint maxUnit;
 400    GET_CURRENT_CONTEXT(ctx);
 401
 402    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 403       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 404    if (ctx->Texture.CurrentUnit >= maxUnit) {
 405       _mesa_error(ctx, GL_INVALID_OPERATION, "glTexEnvfv(current unit)");
 406       return;
 407    }
 408
 409    if (target == GL_TEXTURE_ENV) {
 410       struct gl_fixedfunc_texture_unit *texUnit =
 411          _mesa_get_current_fixedfunc_tex_unit(ctx);
 412
 413       /* The GL spec says that we should report an error if the unit is greater
 414        * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
 415        * fixed-function units are usable. This is probably a spec bug.
 416        * Ignore glTexEnv(GL_TEXTURE_ENV) calls for non-fixed-func units,
 417        * because we don't want to process calls that have no effect.
 418        */
 419       if (!texUnit)
 420          return;
 421
 422       switch (pname) {
 423       case GL_TEXTURE_ENV_MODE:
 424          set_env_mode(ctx, texUnit, (GLenum) iparam0);
 425          break;
 426       case GL_TEXTURE_ENV_COLOR:
 427          set_env_color(ctx, texUnit, param);
 428          break;
 429       case GL_COMBINE_RGB:
 430       case GL_COMBINE_ALPHA:
 431          if (!set_combiner_mode(ctx, texUnit, pname, (GLenum) iparam0))
 432             return;
 433          break;
 434       case GL_SOURCE0_RGB:
 435       case GL_SOURCE1_RGB:
 436       case GL_SOURCE2_RGB:
 437       case GL_SOURCE3_RGB_NV:
 438       case GL_SOURCE0_ALPHA:
 439       case GL_SOURCE1_ALPHA:
 440       case GL_SOURCE2_ALPHA:
 441       case GL_SOURCE3_ALPHA_NV:
 442          if (!set_combiner_source(ctx, texUnit, pname, (GLenum) iparam0))
 443             return;
 444          break;
 445       case GL_OPERAND0_RGB:
 446       case GL_OPERAND1_RGB:
 447       case GL_OPERAND2_RGB:
 448       case GL_OPERAND3_RGB_NV:
 449       case GL_OPERAND0_ALPHA:
 450       case GL_OPERAND1_ALPHA:
 451       case GL_OPERAND2_ALPHA:
 452       case GL_OPERAND3_ALPHA_NV:
 453          if (!set_combiner_operand(ctx, texUnit, pname, (GLenum) iparam0))
 454             return;
 455          break;
 456       case GL_RGB_SCALE:
 457       case GL_ALPHA_SCALE:
 458          if (!set_combiner_scale(ctx, texUnit, pname, param[0]))
 459             return;
 460          break;
 461       default:
 462          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
 463          return;
 464       }
 465    }
 466    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 467       struct gl_texture_unit *texUnit =
 468          _mesa_get_current_tex_unit(ctx);
 469
 470       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 471          if (texUnit->LodBias == param[0])
 472             return;
 473          FLUSH_VERTICES(ctx, _NEW_TEXTURE_OBJECT);
 474          texUnit->LodBias = param[0];
 475       }
 476       else {
 477          TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 478          return;
 479       }
 480    }
 481    else if (target == GL_POINT_SPRITE_NV) {
 482       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 483       if (!ctx->Extensions.NV_point_sprite
 484           && !ctx->Extensions.ARB_point_sprite) {
 485          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
 486          return;
 487       }
 488       if (pname == GL_COORD_REPLACE_NV) {
 489          /* It's kind of weird to set point state via glTexEnv,
 490           * but that's what the spec calls for.
 491           */
 492          if (iparam0 == GL_TRUE) {
 493             if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
 494                return;
 495             ctx->Point.CoordReplace |= (1u << ctx->Texture.CurrentUnit);
 496          } else if (iparam0 == GL_FALSE) {
 497             if (~(ctx->Point.CoordReplace) & (1u << ctx->Texture.CurrentUnit))
 498                return;
 499             ctx->Point.CoordReplace &= ~(1u << ctx->Texture.CurrentUnit);
 500          } else {
 501             _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", iparam0);
 502             return;
 503          }
 504          FLUSH_VERTICES(ctx, _NEW_POINT);
 505       }
 506       else {
 507          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
 508          return;
 509       }
 510    }
 511    else {
 512       _mesa_error(ctx, GL_INVALID_ENUM, "glTexEnv(target=%s)",
 513                   _mesa_enum_to_string(target));
 514       return;
 515    }
 516
 517    if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
 518       _mesa_debug(ctx, "glTexEnv %s %s %.1f(%s) ...\n",
 519                   _mesa_enum_to_string(target),
 520                   _mesa_enum_to_string(pname),
 521                   *param,
 522                   _mesa_enum_to_string((GLenum) iparam0));
 523
 524    /* Tell device driver about the new texture environment */
 525    if (ctx->Driver.TexEnv) {
 526       ctx->Driver.TexEnv(ctx, target, pname, param);
 527    }
 528 }
 529
 530
 531 void GLAPIENTRY
 532 _mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
 533 {
 534    GLfloat p[4];
 535    p[0] = param;
 536    p[1] = p[2] = p[3] = 0.0;
 537    _mesa_TexEnvfv( target, pname, p );
 538 }
 539
 540
 541
 542 void GLAPIENTRY
 543 _mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
 544 {
 545    GLfloat p[4];
 546    p[0] = (GLfloat) param;
 547    p[1] = p[2] = p[3] = 0.0;
 548    _mesa_TexEnvfv( target, pname, p );
 549 }
 550
 551
 552 void GLAPIENTRY
 553 _mesa_TexEnviv( GLenum target, GLenum pname, const GLint *param )
 554 {
 555    GLfloat p[4];
 556    if (pname == GL_TEXTURE_ENV_COLOR) {
 557       p[0] = INT_TO_FLOAT( param[0] );
 558       p[1] = INT_TO_FLOAT( param[1] );
 559       p[2] = INT_TO_FLOAT( param[2] );
 560       p[3] = INT_TO_FLOAT( param[3] );
 561    }
 562    else {
 563       p[0] = (GLfloat) param[0];
 564       p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
 565    }
 566    _mesa_TexEnvfv( target, pname, p );
 567 }
 568
 569
 570
 571 /**
 572  * Helper for glGetTexEnvi/f()
 573  * \return  value of queried pname or -1 if error.
 574  */
 575 static GLint
 576 get_texenvi(struct gl_context *ctx,
 577             const struct gl_fixedfunc_texture_unit *texUnit,
 578             GLenum pname)
 579 {
 580    switch (pname) {
 581    case GL_TEXTURE_ENV_MODE:
 582       return texUnit->EnvMode;
 583       break;
 584    case GL_COMBINE_RGB:
 585       return texUnit->Combine.ModeRGB;
 586    case GL_COMBINE_ALPHA:
 587       return texUnit->Combine.ModeA;
 588    case GL_SOURCE0_RGB:
 589    case GL_SOURCE1_RGB:
 590    case GL_SOURCE2_RGB: {
 591       const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
 592       return texUnit->Combine.SourceRGB[rgb_idx];
 593    }
 594    case GL_SOURCE3_RGB_NV:
 595       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 596          return texUnit->Combine.SourceRGB[3];
 597       }
 598       else {
 599          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 600       }
 601       break;
 602    case GL_SOURCE0_ALPHA:
 603    case GL_SOURCE1_ALPHA:
 604    case GL_SOURCE2_ALPHA: {
 605       const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
 606       return texUnit->Combine.SourceA[alpha_idx];
 607    }
 608    case GL_SOURCE3_ALPHA_NV:
 609       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 610          return texUnit->Combine.SourceA[3];
 611       }
 612       else {
 613          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 614       }
 615       break;
 616    case GL_OPERAND0_RGB:
 617    case GL_OPERAND1_RGB:
 618    case GL_OPERAND2_RGB: {
 619       const unsigned op_rgb = pname - GL_OPERAND0_RGB;
 620       return texUnit->Combine.OperandRGB[op_rgb];
 621    }
 622    case GL_OPERAND3_RGB_NV:
 623       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 624          return texUnit->Combine.OperandRGB[3];
 625       }
 626       else {
 627          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 628       }
 629       break;
 630    case GL_OPERAND0_ALPHA:
 631    case GL_OPERAND1_ALPHA:
 632    case GL_OPERAND2_ALPHA: {
 633       const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
 634       return texUnit->Combine.OperandA[op_alpha];
 635    }
 636    case GL_OPERAND3_ALPHA_NV:
 637       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 638          return texUnit->Combine.OperandA[3];
 639       }
 640       else {
 641          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 642       }
 643       break;
 644    case GL_RGB_SCALE:
 645       return 1 << texUnit->Combine.ScaleShiftRGB;
 646    case GL_ALPHA_SCALE:
 647       return 1 << texUnit->Combine.ScaleShiftA;
 648    default:
 649       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 650       break;
 651    }
 652
 653    return -1; /* error */
 654 }
 655
 656
 657
 658 void GLAPIENTRY
 659 _mesa_GetTexEnvfv( GLenum target, GLenum pname, GLfloat *params )
 660 {
 661    GLuint maxUnit;
 662    GET_CURRENT_CONTEXT(ctx);
 663
 664    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 665       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 666    if (ctx->Texture.CurrentUnit >= maxUnit) {
 667       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnvfv(current unit)");
 668       return;
 669    }
 670
 671    if (target == GL_TEXTURE_ENV) {
 672       struct gl_fixedfunc_texture_unit *texUnit =
 673          _mesa_get_current_fixedfunc_tex_unit(ctx);
 674
 675       /* The GL spec says that we should report an error if the unit is greater
 676        * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
 677        * fixed-function units are usable. This is probably a spec bug.
 678        * Ignore calls for non-fixed-func units, because we don't process
 679        * glTexEnv for them either.
 680        */
 681       if (!texUnit)
 682          return;
 683
 684       if (pname == GL_TEXTURE_ENV_COLOR) {
 685          if(ctx->NewState & (_NEW_BUFFERS | _NEW_FRAG_CLAMP))
 686             _mesa_update_state(ctx);
 687          if (_mesa_get_clamp_fragment_color(ctx, ctx->DrawBuffer))
 688             COPY_4FV( params, texUnit->EnvColor );
 689          else
 690             COPY_4FV( params, texUnit->EnvColorUnclamped );
 691       }
 692       else {
 693          GLint val = get_texenvi(ctx, texUnit, pname);
 694          if (val >= 0) {
 695             *params = (GLfloat) val;
 696          }
 697       }
 698    }
 699    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 700       const struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 701
 702       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 703          *params = texUnit->LodBias;
 704       }
 705       else {
 706          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 707          return;
 708       }
 709    }
 710    else if (target == GL_POINT_SPRITE_NV) {
 711       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 712       if (!ctx->Extensions.NV_point_sprite
 713           && !ctx->Extensions.ARB_point_sprite) {
 714          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 715          return;
 716       }
 717       if (pname == GL_COORD_REPLACE_NV) {
 718          if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
 719             *params = 1.0f;
 720          else
 721             *params = 0.0f;
 722       }
 723       else {
 724          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 725          return;
 726       }
 727    }
 728    else {
 729       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 730       return;
 731    }
 732 }
 733
 734
 735 void GLAPIENTRY
 736 _mesa_GetTexEnviv( GLenum target, GLenum pname, GLint *params )
 737 {
 738    GLuint maxUnit;
 739    GET_CURRENT_CONTEXT(ctx);
 740
 741    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 742       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 743    if (ctx->Texture.CurrentUnit >= maxUnit) {
 744       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnviv(current unit)");
 745       return;
 746    }
 747
 748    if (target == GL_TEXTURE_ENV) {
 749       struct gl_fixedfunc_texture_unit *texUnit =
 750          _mesa_get_current_fixedfunc_tex_unit(ctx);
 751
 752       /* The GL spec says that we should report an error if the unit is greater
 753        * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
 754        * fixed-function units are usable. This is probably a spec bug.
 755        * Ignore calls for non-fixed-func units, because we don't process
 756        * glTexEnv for them either.
 757        */
 758       if (!texUnit)
 759          return;
 760
 761       if (pname == GL_TEXTURE_ENV_COLOR) {
 762          params[0] = FLOAT_TO_INT( texUnit->EnvColor[0] );
 763          params[1] = FLOAT_TO_INT( texUnit->EnvColor[1] );
 764          params[2] = FLOAT_TO_INT( texUnit->EnvColor[2] );
 765          params[3] = FLOAT_TO_INT( texUnit->EnvColor[3] );
 766       }
 767       else {
 768          GLint val = get_texenvi(ctx, texUnit, pname);
 769          if (val >= 0) {
 770             *params = val;
 771          }
 772       }
 773    }
 774    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 775       const struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 776
 777       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 778          *params = (GLint) texUnit->LodBias;
 779       }
 780       else {
 781          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 782          return;
 783       }
 784    }
 785    else if (target == GL_POINT_SPRITE_NV) {
 786       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 787       if (!ctx->Extensions.NV_point_sprite
 788           && !ctx->Extensions.ARB_point_sprite) {
 789          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 790          return;
 791       }
 792       if (pname == GL_COORD_REPLACE_NV) {
 793          if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
 794             *params = GL_TRUE;
 795          else
 796             *params = GL_FALSE;
 797       }
 798       else {
 799          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 800          return;
 801       }
 802    }
 803    else {
 804       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 805       return;
 806    }
 807 }
 808