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 static void
 395 _mesa_texenvfv_indexed( struct gl_context* ctx, GLuint texunit, GLenum target,
 396                         GLenum pname, const GLfloat *param )
 397 {
 398    const GLint iparam0 = (GLint) param[0];
 399    GLuint maxUnit;
 400
 401    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 402       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 403    if (texunit >= maxUnit) {
 404       _mesa_error(ctx, GL_INVALID_OPERATION, "glTexEnvfv(texunit=%d)", texunit);
 405       return;
 406    }
 407
 408    if (target == GL_TEXTURE_ENV) {
 409       struct gl_fixedfunc_texture_unit *texUnit =
 410          _mesa_get_fixedfunc_tex_unit(ctx, texunit);
 411
 412       /* The GL spec says that we should report an error if the unit is greater
 413        * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
 414        * fixed-function units are usable. This is probably a spec bug.
 415        * Ignore glTexEnv(GL_TEXTURE_ENV) calls for non-fixed-func units,
 416        * because we don't want to process calls that have no effect.
 417        */
 418       if (!texUnit)
 419          return;
 420
 421       switch (pname) {
 422       case GL_TEXTURE_ENV_MODE:
 423          set_env_mode(ctx, texUnit, (GLenum) iparam0);
 424          break;
 425       case GL_TEXTURE_ENV_COLOR:
 426          set_env_color(ctx, texUnit, param);
 427          break;
 428       case GL_COMBINE_RGB:
 429       case GL_COMBINE_ALPHA:
 430          if (!set_combiner_mode(ctx, texUnit, pname, (GLenum) iparam0))
 431             return;
 432          break;
 433       case GL_SOURCE0_RGB:
 434       case GL_SOURCE1_RGB:
 435       case GL_SOURCE2_RGB:
 436       case GL_SOURCE3_RGB_NV:
 437       case GL_SOURCE0_ALPHA:
 438       case GL_SOURCE1_ALPHA:
 439       case GL_SOURCE2_ALPHA:
 440       case GL_SOURCE3_ALPHA_NV:
 441          if (!set_combiner_source(ctx, texUnit, pname, (GLenum) iparam0))
 442             return;
 443          break;
 444       case GL_OPERAND0_RGB:
 445       case GL_OPERAND1_RGB:
 446       case GL_OPERAND2_RGB:
 447       case GL_OPERAND3_RGB_NV:
 448       case GL_OPERAND0_ALPHA:
 449       case GL_OPERAND1_ALPHA:
 450       case GL_OPERAND2_ALPHA:
 451       case GL_OPERAND3_ALPHA_NV:
 452          if (!set_combiner_operand(ctx, texUnit, pname, (GLenum) iparam0))
 453             return;
 454          break;
 455       case GL_RGB_SCALE:
 456       case GL_ALPHA_SCALE:
 457          if (!set_combiner_scale(ctx, texUnit, pname, param[0]))
 458             return;
 459          break;
 460       default:
 461          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
 462          return;
 463       }
 464    }
 465    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 466       struct gl_texture_unit *texUnit =
 467          _mesa_get_tex_unit(ctx, texunit);
 468
 469       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 470          if (texUnit->LodBias == param[0])
 471             return;
 472          FLUSH_VERTICES(ctx, _NEW_TEXTURE_OBJECT);
 473          texUnit->LodBias = param[0];
 474       }
 475       else {
 476          TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
 477          return;
 478       }
 479    }
 480    else if (target == GL_POINT_SPRITE_NV) {
 481       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 482       if (!ctx->Extensions.NV_point_sprite
 483           && !ctx->Extensions.ARB_point_sprite) {
 484          _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
 485          return;
 486       }
 487       if (pname == GL_COORD_REPLACE_NV) {
 488          /* It's kind of weird to set point state via glTexEnv,
 489           * but that's what the spec calls for.
 490           */
 491          if (iparam0 == GL_TRUE) {
 492             if (ctx->Point.CoordReplace & (1u << texunit))
 493                return;
 494             FLUSH_VERTICES(ctx, _NEW_POINT);
 495             ctx->Point.CoordReplace |= (1u << texunit);
 496          } else if (iparam0 == GL_FALSE) {
 497             if (~(ctx->Point.CoordReplace) & (1u << texunit))
 498                return;
 499             FLUSH_VERTICES(ctx, _NEW_POINT);
 500             ctx->Point.CoordReplace &= ~(1u << texunit);
 501          } else {
 502             _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", iparam0);
 503             return;
 504          }
 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_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
 533 {
 534    GET_CURRENT_CONTEXT(ctx);
 535    _mesa_texenvfv_indexed(ctx, ctx->Texture.CurrentUnit, target, pname, param);
 536 }
 537
 538
 539 void GLAPIENTRY
 540 _mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
 541 {
 542    GLfloat p[4];
 543    p[0] = param;
 544    p[1] = p[2] = p[3] = 0.0;
 545    _mesa_TexEnvfv( target, pname, p );
 546 }
 547
 548
 549 void GLAPIENTRY
 550 _mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
 551 {
 552    GLfloat p[4];
 553    p[0] = (GLfloat) param;
 554    p[1] = p[2] = p[3] = 0.0;
 555    _mesa_TexEnvfv( target, pname, p );
 556 }
 557
 558
 559 void GLAPIENTRY
 560 _mesa_TexEnviv( GLenum target, GLenum pname, const GLint *param )
 561 {
 562    GLfloat p[4];
 563    if (pname == GL_TEXTURE_ENV_COLOR) {
 564       p[0] = INT_TO_FLOAT( param[0] );
 565       p[1] = INT_TO_FLOAT( param[1] );
 566       p[2] = INT_TO_FLOAT( param[2] );
 567       p[3] = INT_TO_FLOAT( param[3] );
 568    }
 569    else {
 570       p[0] = (GLfloat) param[0];
 571       p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
 572    }
 573    _mesa_TexEnvfv( target, pname, p );
 574 }
 575
 576
 577 void GLAPIENTRY
 578 _mesa_MultiTexEnvfEXT( GLenum texunit, GLenum target,
 579                        GLenum pname, GLfloat param )
 580 {
 581    GET_CURRENT_CONTEXT(ctx);
 582    GLfloat p[4];
 583    p[0] = param;
 584    p[1] = p[2] = p[3] = 0.0;
 585    _mesa_texenvfv_indexed(ctx, texunit - GL_TEXTURE0, target, pname, p);
 586 }
 587
 588 void GLAPIENTRY
 589 _mesa_MultiTexEnvfvEXT( GLenum texunit, GLenum target,
 590                         GLenum pname, const GLfloat *param )
 591 {
 592    GET_CURRENT_CONTEXT(ctx);
 593    _mesa_texenvfv_indexed(ctx, texunit - GL_TEXTURE0, target, pname, param);
 594 }
 595
 596
 597 void GLAPIENTRY
 598 _mesa_MultiTexEnviEXT( GLenum texunit, GLenum target,
 599                        GLenum pname, GLint param )
 600 {
 601    GET_CURRENT_CONTEXT(ctx);
 602    GLfloat p[4];
 603    p[0] = (GLfloat) param;
 604    p[1] = p[2] = p[3] = 0.0;
 605    _mesa_texenvfv_indexed( ctx, texunit - GL_TEXTURE0, target, pname, p );
 606 }
 607
 608
 609 void GLAPIENTRY
 610 _mesa_MultiTexEnvivEXT( GLenum texunit, GLenum target,
 611                         GLenum pname, const GLint *param )
 612 {
 613    GET_CURRENT_CONTEXT(ctx);
 614    GLfloat p[4];
 615    if (pname == GL_TEXTURE_ENV_COLOR) {
 616       p[0] = INT_TO_FLOAT( param[0] );
 617       p[1] = INT_TO_FLOAT( param[1] );
 618       p[2] = INT_TO_FLOAT( param[2] );
 619       p[3] = INT_TO_FLOAT( param[3] );
 620    }
 621    else {
 622       p[0] = (GLfloat) param[0];
 623       p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
 624    }
 625    _mesa_texenvfv_indexed( ctx, texunit - GL_TEXTURE0, target, pname, p );
 626 }
 627
 628
 629
 630
 631 /**
 632  * Helper for glGetTexEnvi/f()
 633  * \return  value of queried pname or -1 if error.
 634  */
 635 static GLint
 636 get_texenvi(struct gl_context *ctx,
 637             const struct gl_fixedfunc_texture_unit *texUnit,
 638             GLenum pname)
 639 {
 640    switch (pname) {
 641    case GL_TEXTURE_ENV_MODE:
 642       return texUnit->EnvMode;
 643       break;
 644    case GL_COMBINE_RGB:
 645       return texUnit->Combine.ModeRGB;
 646    case GL_COMBINE_ALPHA:
 647       return texUnit->Combine.ModeA;
 648    case GL_SOURCE0_RGB:
 649    case GL_SOURCE1_RGB:
 650    case GL_SOURCE2_RGB: {
 651       const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
 652       return texUnit->Combine.SourceRGB[rgb_idx];
 653    }
 654    case GL_SOURCE3_RGB_NV:
 655       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 656          return texUnit->Combine.SourceRGB[3];
 657       }
 658       else {
 659          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 660       }
 661       break;
 662    case GL_SOURCE0_ALPHA:
 663    case GL_SOURCE1_ALPHA:
 664    case GL_SOURCE2_ALPHA: {
 665       const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
 666       return texUnit->Combine.SourceA[alpha_idx];
 667    }
 668    case GL_SOURCE3_ALPHA_NV:
 669       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 670          return texUnit->Combine.SourceA[3];
 671       }
 672       else {
 673          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 674       }
 675       break;
 676    case GL_OPERAND0_RGB:
 677    case GL_OPERAND1_RGB:
 678    case GL_OPERAND2_RGB: {
 679       const unsigned op_rgb = pname - GL_OPERAND0_RGB;
 680       return texUnit->Combine.OperandRGB[op_rgb];
 681    }
 682    case GL_OPERAND3_RGB_NV:
 683       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 684          return texUnit->Combine.OperandRGB[3];
 685       }
 686       else {
 687          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 688       }
 689       break;
 690    case GL_OPERAND0_ALPHA:
 691    case GL_OPERAND1_ALPHA:
 692    case GL_OPERAND2_ALPHA: {
 693       const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
 694       return texUnit->Combine.OperandA[op_alpha];
 695    }
 696    case GL_OPERAND3_ALPHA_NV:
 697       if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
 698          return texUnit->Combine.OperandA[3];
 699       }
 700       else {
 701          _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 702       }
 703       break;
 704    case GL_RGB_SCALE:
 705       return 1 << texUnit->Combine.ScaleShiftRGB;
 706    case GL_ALPHA_SCALE:
 707       return 1 << texUnit->Combine.ScaleShiftA;
 708    default:
 709       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
 710       break;
 711    }
 712
 713    return -1; /* error */
 714 }
 715
 716
 717 static void
 718 _mesa_gettexenvfv_indexed( GLuint texunit, GLenum target, GLenum pname, GLfloat *params )
 719 {
 720    GLuint maxUnit;
 721    GET_CURRENT_CONTEXT(ctx);
 722
 723    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 724       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 725    if (texunit >= maxUnit) {
 726       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnvfv(texunit=%d)", texunit);
 727       return;
 728    }
 729
 730    if (target == GL_TEXTURE_ENV) {
 731       struct gl_fixedfunc_texture_unit *texUnit =
 732          _mesa_get_fixedfunc_tex_unit(ctx, texunit);
 733
 734       /* The GL spec says that we should report an error if the unit is greater
 735        * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
 736        * fixed-function units are usable. This is probably a spec bug.
 737        * Ignore calls for non-fixed-func units, because we don't process
 738        * glTexEnv for them either.
 739        */
 740       if (!texUnit)
 741          return;
 742
 743       if (pname == GL_TEXTURE_ENV_COLOR) {
 744          if (_mesa_get_clamp_fragment_color(ctx, ctx->DrawBuffer))
 745             COPY_4FV( params, texUnit->EnvColor );
 746          else
 747             COPY_4FV( params, texUnit->EnvColorUnclamped );
 748       }
 749       else {
 750          GLint val = get_texenvi(ctx, texUnit, pname);
 751          if (val >= 0) {
 752             *params = (GLfloat) val;
 753          }
 754       }
 755    }
 756    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 757       const struct gl_texture_unit *texUnit = _mesa_get_tex_unit(ctx, texunit);
 758
 759       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 760          *params = texUnit->LodBias;
 761       }
 762       else {
 763          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 764          return;
 765       }
 766    }
 767    else if (target == GL_POINT_SPRITE_NV) {
 768       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 769       if (!ctx->Extensions.NV_point_sprite
 770           && !ctx->Extensions.ARB_point_sprite) {
 771          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 772          return;
 773       }
 774       if (pname == GL_COORD_REPLACE_NV) {
 775          if (ctx->Point.CoordReplace & (1u << texunit))
 776             *params = 1.0f;
 777          else
 778             *params = 0.0f;
 779       }
 780       else {
 781          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
 782          return;
 783       }
 784    }
 785    else {
 786       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
 787       return;
 788    }
 789 }
 790
 791
 792 static void
 793 _mesa_gettexenviv_indexed( GLuint texunit, GLenum target,
 794                            GLenum pname, GLint *params )
 795 {
 796    GLuint maxUnit;
 797    GET_CURRENT_CONTEXT(ctx);
 798
 799    maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
 800       ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
 801    if (texunit >= maxUnit) {
 802       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnviv(texunit=%d)",
 803                   texunit);
 804       return;
 805    }
 806
 807    if (target == GL_TEXTURE_ENV) {
 808       struct gl_fixedfunc_texture_unit *texUnit =
 809          _mesa_get_fixedfunc_tex_unit(ctx, texunit);
 810
 811       /* The GL spec says that we should report an error if the unit is greater
 812        * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
 813        * fixed-function units are usable. This is probably a spec bug.
 814        * Ignore calls for non-fixed-func units, because we don't process
 815        * glTexEnv for them either.
 816        */
 817       if (!texUnit)
 818          return;
 819
 820       if (pname == GL_TEXTURE_ENV_COLOR) {
 821          params[0] = FLOAT_TO_INT( texUnit->EnvColor[0] );
 822          params[1] = FLOAT_TO_INT( texUnit->EnvColor[1] );
 823          params[2] = FLOAT_TO_INT( texUnit->EnvColor[2] );
 824          params[3] = FLOAT_TO_INT( texUnit->EnvColor[3] );
 825       }
 826       else {
 827          GLint val = get_texenvi(ctx, texUnit, pname);
 828          if (val >= 0) {
 829             *params = val;
 830          }
 831       }
 832    }
 833    else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
 834       const struct gl_texture_unit *texUnit = _mesa_get_tex_unit(ctx, texunit);
 835
 836       if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
 837          *params = (GLint) texUnit->LodBias;
 838       }
 839       else {
 840          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 841          return;
 842       }
 843    }
 844    else if (target == GL_POINT_SPRITE_NV) {
 845       /* GL_ARB_point_sprite / GL_NV_point_sprite */
 846       if (!ctx->Extensions.NV_point_sprite
 847           && !ctx->Extensions.ARB_point_sprite) {
 848          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 849          return;
 850       }
 851       if (pname == GL_COORD_REPLACE_NV) {
 852          if (ctx->Point.CoordReplace & (1u << texunit))
 853             *params = GL_TRUE;
 854          else
 855             *params = GL_FALSE;
 856       }
 857       else {
 858          _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
 859          return;
 860       }
 861    }
 862    else {
 863       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
 864       return;
 865    }
 866 }
 867
 868
 869 void GLAPIENTRY
 870 _mesa_GetTexEnvfv( GLenum target, GLenum pname, GLfloat *params )
 871 {
 872    GET_CURRENT_CONTEXT(ctx);
 873    _mesa_gettexenvfv_indexed(ctx->Texture.CurrentUnit, target, pname, params);
 874 }
 875
 876
 877 void GLAPIENTRY
 878 _mesa_GetMultiTexEnvfvEXT( GLenum texunit, GLenum target,
 879                            GLenum pname, GLfloat *params )
 880 {
 881    _mesa_gettexenvfv_indexed(texunit - GL_TEXTURE0, target, pname, params);
 882 }
 883
 884
 885 void GLAPIENTRY
 886 _mesa_GetTexEnviv( GLenum target, GLenum pname, GLint *params )
 887 {
 888    GET_CURRENT_CONTEXT(ctx);
 889    _mesa_gettexenviv_indexed(ctx->Texture.CurrentUnit, target, pname, params);
 890 }
 891
 892
 893 void GLAPIENTRY
 894 _mesa_GetMultiTexEnvivEXT( GLenum texunit, GLenum target,
 895                            GLenum pname, GLint *params )
 896 {
 897    _mesa_gettexenviv_indexed(texunit - GL_TEXTURE0, target, pname, params);
 898 }