src/mesa/main/texstate.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.5
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   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  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file texstate.c
  27  *
  28  * Texture state handling.
  29  */
  30
  31 #include "glheader.h"
  32 #include "mfeatures.h"
  33 #include "colormac.h"
  34 #if FEATURE_colortable
  35 #include "colortab.h"
  36 #endif
  37 #include "context.h"
  38 #include "enums.h"
  39 #include "macros.h"
  40 #include "texcompress.h"
  41 #include "texobj.h"
  42 #include "teximage.h"
  43 #include "texstate.h"
  44 #include "texenvprogram.h"
  45 #include "mtypes.h"
  46
  47
  48
  49 /**
  50  * Default texture combine environment state.  This is used to initialize
  51  * a context's texture units and as the basis for converting "classic"
  52  * texture environmnets to ARB_texture_env_combine style values.
  53  */
  54 static const struct gl_tex_env_combine_state default_combine_state = {
  55    GL_MODULATE, GL_MODULATE,
  56    { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
  57    { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
  58    { GL_SRC_COLOR, GL_SRC_COLOR, GL_SRC_ALPHA, GL_SRC_ALPHA },
  59    { GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA },
  60    0, 0,
  61    2, 2
  62 };
  63
  64
  65
  66 /**
  67  * Used by glXCopyContext to copy texture state from one context to another.
  68  */
  69 void
  70 _mesa_copy_texture_state( const GLcontext *src, GLcontext *dst )
  71 {
  72    GLuint u, tex;
  73
  74    ASSERT(src);
  75    ASSERT(dst);
  76
  77    dst->Texture.CurrentUnit = src->Texture.CurrentUnit;
  78    dst->Texture._GenFlags = src->Texture._GenFlags;
  79    dst->Texture._TexGenEnabled = src->Texture._TexGenEnabled;
  80    dst->Texture._TexMatEnabled = src->Texture._TexMatEnabled;
  81    dst->Texture.SharedPalette = src->Texture.SharedPalette;
  82
  83    /* per-unit state */
  84    for (u = 0; u < src->Const.MaxTextureImageUnits; u++) {
  85       dst->Texture.Unit[u].Enabled = src->Texture.Unit[u].Enabled;
  86       dst->Texture.Unit[u].EnvMode = src->Texture.Unit[u].EnvMode;
  87       COPY_4V(dst->Texture.Unit[u].EnvColor, src->Texture.Unit[u].EnvColor);
  88       dst->Texture.Unit[u].TexGenEnabled = src->Texture.Unit[u].TexGenEnabled;
  89       dst->Texture.Unit[u].GenS = src->Texture.Unit[u].GenS;
  90       dst->Texture.Unit[u].GenT = src->Texture.Unit[u].GenT;
  91       dst->Texture.Unit[u].GenR = src->Texture.Unit[u].GenR;
  92       dst->Texture.Unit[u].GenQ = src->Texture.Unit[u].GenQ;
  93       dst->Texture.Unit[u].LodBias = src->Texture.Unit[u].LodBias;
  94
  95       /* GL_EXT_texture_env_combine */
  96       dst->Texture.Unit[u].Combine = src->Texture.Unit[u].Combine;
  97
  98       /* GL_ATI_envmap_bumpmap - need this? */
  99       dst->Texture.Unit[u].BumpTarget = src->Texture.Unit[u].BumpTarget;
 100       COPY_4V(dst->Texture.Unit[u].RotMatrix, src->Texture.Unit[u].RotMatrix);
 101
 102
 103       /* copy texture object bindings, not contents of texture objects */
 104       _mesa_lock_context_textures(dst);
 105
 106       for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 107          _mesa_reference_texobj(&dst->Texture.Unit[u].CurrentTex[tex],
 108                                 src->Texture.Unit[u].CurrentTex[tex]);
 109       }
 110
 111       _mesa_unlock_context_textures(dst);
 112    }
 113 }
 114
 115
 116 /*
 117  * For debugging
 118  */
 119 void
 120 _mesa_print_texunit_state( GLcontext *ctx, GLuint unit )
 121 {
 122    const struct gl_texture_unit *texUnit = ctx->Texture.Unit + unit;
 123    _mesa_printf("Texture Unit %d\n", unit);
 124    _mesa_printf("  GL_TEXTURE_ENV_MODE = %s\n", _mesa_lookup_enum_by_nr(texUnit->EnvMode));
 125    _mesa_printf("  GL_COMBINE_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeRGB));
 126    _mesa_printf("  GL_COMBINE_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeA));
 127    _mesa_printf("  GL_SOURCE0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[0]));
 128    _mesa_printf("  GL_SOURCE1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[1]));
 129    _mesa_printf("  GL_SOURCE2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[2]));
 130    _mesa_printf("  GL_SOURCE0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[0]));
 131    _mesa_printf("  GL_SOURCE1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[1]));
 132    _mesa_printf("  GL_SOURCE2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[2]));
 133    _mesa_printf("  GL_OPERAND0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[0]));
 134    _mesa_printf("  GL_OPERAND1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[1]));
 135    _mesa_printf("  GL_OPERAND2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[2]));
 136    _mesa_printf("  GL_OPERAND0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[0]));
 137    _mesa_printf("  GL_OPERAND1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[1]));
 138    _mesa_printf("  GL_OPERAND2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[2]));
 139    _mesa_printf("  GL_RGB_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftRGB);
 140    _mesa_printf("  GL_ALPHA_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftA);
 141    _mesa_printf("  GL_TEXTURE_ENV_COLOR = (%f, %f, %f, %f)\n", texUnit->EnvColor[0], texUnit->EnvColor[1], texUnit->EnvColor[2], texUnit->EnvColor[3]);
 142 }
 143
 144
 145
 146 /**********************************************************************/
 147 /*                       Texture Environment                          */
 148 /**********************************************************************/
 149
 150 /**
 151  * Convert "classic" texture environment to ARB_texture_env_combine style
 152  * environments.
 153  *
 154  * \param state  texture_env_combine state vector to be filled-in.
 155  * \param mode   Classic texture environment mode (i.e., \c GL_REPLACE,
 156  *               \c GL_BLEND, \c GL_DECAL, etc.).
 157  * \param texBaseFormat  Base format of the texture associated with the
 158  *               texture unit.
 159  */
 160 static void
 161 calculate_derived_texenv( struct gl_tex_env_combine_state *state,
 162                           GLenum mode, GLenum texBaseFormat )
 163 {
 164    GLenum mode_rgb;
 165    GLenum mode_a;
 166
 167    *state = default_combine_state;
 168
 169    switch (texBaseFormat) {
 170    case GL_ALPHA:
 171       state->SourceRGB[0] = GL_PREVIOUS;
 172       break;
 173
 174    case GL_LUMINANCE_ALPHA:
 175    case GL_INTENSITY:
 176    case GL_RGBA:
 177       break;
 178
 179    case GL_LUMINANCE:
 180    case GL_RGB:
 181    case GL_YCBCR_MESA:
 182       state->SourceA[0] = GL_PREVIOUS;
 183       break;
 184
 185    default:
 186       _mesa_problem(NULL, "Invalid texBaseFormat in calculate_derived_texenv");
 187       return;
 188    }
 189
 190    if (mode == GL_REPLACE_EXT)
 191       mode = GL_REPLACE;
 192
 193    switch (mode) {
 194    case GL_REPLACE:
 195    case GL_MODULATE:
 196       mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : mode;
 197       mode_a   = mode;
 198       break;
 199
 200    case GL_DECAL:
 201       mode_rgb = GL_INTERPOLATE;
 202       mode_a   = GL_REPLACE;
 203
 204       state->SourceA[0] = GL_PREVIOUS;
 205
 206       /* Having alpha / luminance / intensity textures replace using the
 207        * incoming fragment color matches the definition in NV_texture_shader.
 208        * The 1.5 spec simply marks these as "undefined".
 209        */
 210       switch (texBaseFormat) {
 211       case GL_ALPHA:
 212       case GL_LUMINANCE:
 213       case GL_LUMINANCE_ALPHA:
 214       case GL_INTENSITY:
 215          state->SourceRGB[0] = GL_PREVIOUS;
 216          break;
 217       case GL_RGB:
 218       case GL_YCBCR_MESA:
 219          mode_rgb = GL_REPLACE;
 220          break;
 221       case GL_RGBA:
 222          state->SourceRGB[2] = GL_TEXTURE;
 223          break;
 224       }
 225       break;
 226
 227    case GL_BLEND:
 228       mode_rgb = GL_INTERPOLATE;
 229       mode_a   = GL_MODULATE;
 230
 231       switch (texBaseFormat) {
 232       case GL_ALPHA:
 233          mode_rgb = GL_REPLACE;
 234          break;
 235       case GL_INTENSITY:
 236          mode_a = GL_INTERPOLATE;
 237          state->SourceA[0] = GL_CONSTANT;
 238          state->OperandA[2] = GL_SRC_ALPHA;
 239          /* FALLTHROUGH */
 240       case GL_LUMINANCE:
 241       case GL_RGB:
 242       case GL_LUMINANCE_ALPHA:
 243       case GL_RGBA:
 244       case GL_YCBCR_MESA:
 245          state->SourceRGB[2] = GL_TEXTURE;
 246          state->SourceA[2]   = GL_TEXTURE;
 247          state->SourceRGB[0] = GL_CONSTANT;
 248          state->OperandRGB[2] = GL_SRC_COLOR;
 249          break;
 250       }
 251       break;
 252
 253    case GL_ADD:
 254       mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : GL_ADD;
 255       mode_a   = (texBaseFormat == GL_INTENSITY) ? GL_ADD : GL_MODULATE;
 256       break;
 257
 258    default:
 259       _mesa_problem(NULL,
 260                     "Invalid texture env mode in calculate_derived_texenv");
 261       return;
 262    }
 263
 264    state->ModeRGB = (state->SourceRGB[0] != GL_PREVIOUS)
 265        ? mode_rgb : GL_REPLACE;
 266    state->ModeA   = (state->SourceA[0]   != GL_PREVIOUS)
 267        ? mode_a   : GL_REPLACE;
 268 }
 269
 270
 271
 272
 273 /* GL_ARB_multitexture */
 274 void GLAPIENTRY
 275 _mesa_ActiveTextureARB(GLenum texture)
 276 {
 277    GET_CURRENT_CONTEXT(ctx);
 278    const GLuint texUnit = texture - GL_TEXTURE0;
 279    ASSERT_OUTSIDE_BEGIN_END(ctx);
 280
 281    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
 282       _mesa_debug(ctx, "glActiveTexture %s\n",
 283                   _mesa_lookup_enum_by_nr(texture));
 284
 285    if (texUnit >= ctx->Const.MaxTextureImageUnits) {
 286       _mesa_error(ctx, GL_INVALID_ENUM, "glActiveTexture(texture)");
 287       return;
 288    }
 289
 290    if (ctx->Texture.CurrentUnit == texUnit)
 291       return;
 292
 293    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 294
 295    ctx->Texture.CurrentUnit = texUnit;
 296    if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 297       /* update current stack pointer */
 298       ctx->CurrentStack = &ctx->TextureMatrixStack[texUnit];
 299    }
 300
 301    if (ctx->Driver.ActiveTexture) {
 302       (*ctx->Driver.ActiveTexture)( ctx, (GLuint) texUnit );
 303    }
 304 }
 305
 306
 307 /* GL_ARB_multitexture */
 308 void GLAPIENTRY
 309 _mesa_ClientActiveTextureARB(GLenum texture)
 310 {
 311    GET_CURRENT_CONTEXT(ctx);
 312    GLuint texUnit = texture - GL_TEXTURE0;
 313    ASSERT_OUTSIDE_BEGIN_END(ctx);
 314
 315    if (texUnit >= ctx->Const.MaxTextureCoordUnits) {
 316       _mesa_error(ctx, GL_INVALID_ENUM, "glClientActiveTexture(texture)");
 317       return;
 318    }
 319
 320    FLUSH_VERTICES(ctx, _NEW_ARRAY);
 321    ctx->Array.ActiveTexture = texUnit;
 322 }
 323
 324
 325
 326 /**********************************************************************/
 327 /*****                    State management                        *****/
 328 /**********************************************************************/
 329
 330
 331 /**
 332  * \note This routine refers to derived texture attribute values to
 333  * compute the ENABLE_TEXMAT flags, but is only called on
 334  * _NEW_TEXTURE_MATRIX.  On changes to _NEW_TEXTURE, the ENABLE_TEXMAT
 335  * flags are updated by _mesa_update_textures(), below.
 336  *
 337  * \param ctx GL context.
 338  */
 339 static void
 340 update_texture_matrices( GLcontext *ctx )
 341 {
 342    GLuint u;
 343
 344    ctx->Texture._TexMatEnabled = 0x0;
 345
 346    for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
 347       if (_math_matrix_is_dirty(ctx->TextureMatrixStack[u].Top)) {
 348          _math_matrix_analyse( ctx->TextureMatrixStack[u].Top );
 349
 350          if (ctx->Texture.Unit[u]._ReallyEnabled &&
 351              ctx->TextureMatrixStack[u].Top->type != MATRIX_IDENTITY)
 352             ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(u);
 353
 354          if (ctx->Driver.TextureMatrix)
 355             ctx->Driver.TextureMatrix( ctx, u, ctx->TextureMatrixStack[u].Top);
 356       }
 357    }
 358 }
 359
 360
 361 /**
 362  * Examine texture unit's combine/env state to update derived state.
 363  */
 364 static void
 365 update_tex_combine(GLcontext *ctx, struct gl_texture_unit *texUnit)
 366 {
 367    struct gl_tex_env_combine_state *combine;
 368
 369    /* Set the texUnit->_CurrentCombine field to point to the user's combiner
 370     * state, or the combiner state which is derived from traditional texenv
 371     * mode.
 372     */
 373    if (texUnit->EnvMode == GL_COMBINE ||
 374        texUnit->EnvMode == GL_COMBINE4_NV) {
 375       texUnit->_CurrentCombine = & texUnit->Combine;
 376    }
 377    else {
 378       const struct gl_texture_object *texObj = texUnit->_Current;
 379       GLenum format = texObj->Image[0][texObj->BaseLevel]->_BaseFormat;
 380       if (format == GL_COLOR_INDEX) {
 381          format = GL_RGBA;  /* a bit of a hack */
 382       }
 383       else if (format == GL_DEPTH_COMPONENT ||
 384                format == GL_DEPTH_STENCIL_EXT) {
 385          format = texObj->DepthMode;
 386       }
 387       calculate_derived_texenv(&texUnit->_EnvMode, texUnit->EnvMode, format);
 388       texUnit->_CurrentCombine = & texUnit->_EnvMode;
 389    }
 390
 391    combine = texUnit->_CurrentCombine;
 392
 393    /* Determine number of source RGB terms in the combiner function */
 394    switch (combine->ModeRGB) {
 395    case GL_REPLACE:
 396       combine->_NumArgsRGB = 1;
 397       break;
 398    case GL_ADD:
 399    case GL_ADD_SIGNED:
 400       if (texUnit->EnvMode == GL_COMBINE4_NV)
 401          combine->_NumArgsRGB = 4;
 402       else
 403          combine->_NumArgsRGB = 2;
 404       break;
 405    case GL_MODULATE:
 406    case GL_SUBTRACT:
 407    case GL_DOT3_RGB:
 408    case GL_DOT3_RGBA:
 409    case GL_DOT3_RGB_EXT:
 410    case GL_DOT3_RGBA_EXT:
 411       combine->_NumArgsRGB = 2;
 412       break;
 413    case GL_INTERPOLATE:
 414    case GL_MODULATE_ADD_ATI:
 415    case GL_MODULATE_SIGNED_ADD_ATI:
 416    case GL_MODULATE_SUBTRACT_ATI:
 417       combine->_NumArgsRGB = 3;
 418       break;
 419    case GL_BUMP_ENVMAP_ATI:
 420       /* no real arguments for this case */
 421       combine->_NumArgsRGB = 0;
 422       break;
 423    default:
 424       combine->_NumArgsRGB = 0;
 425       _mesa_problem(ctx, "invalid RGB combine mode in update_texture_state");
 426       return;
 427    }
 428
 429    /* Determine number of source Alpha terms in the combiner function */
 430    switch (combine->ModeA) {
 431    case GL_REPLACE:
 432       combine->_NumArgsA = 1;
 433       break;
 434    case GL_ADD:
 435    case GL_ADD_SIGNED:
 436       if (texUnit->EnvMode == GL_COMBINE4_NV)
 437          combine->_NumArgsA = 4;
 438       else
 439          combine->_NumArgsA = 2;
 440       break;
 441    case GL_MODULATE:
 442    case GL_SUBTRACT:
 443       combine->_NumArgsA = 2;
 444       break;
 445    case GL_INTERPOLATE:
 446    case GL_MODULATE_ADD_ATI:
 447    case GL_MODULATE_SIGNED_ADD_ATI:
 448    case GL_MODULATE_SUBTRACT_ATI:
 449       combine->_NumArgsA = 3;
 450       break;
 451    default:
 452       combine->_NumArgsA = 0;
 453       _mesa_problem(ctx, "invalid Alpha combine mode in update_texture_state");
 454       break;
 455    }
 456 }
 457
 458
 459 /**
 460  * \note This routine refers to derived texture matrix values to
 461  * compute the ENABLE_TEXMAT flags, but is only called on
 462  * _NEW_TEXTURE.  On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT
 463  * flags are updated by _mesa_update_texture_matrices, above.
 464  *
 465  * \param ctx GL context.
 466  */
 467 static void
 468 update_texture_state( GLcontext *ctx )
 469 {
 470    GLuint unit;
 471    struct gl_fragment_program *fprog = NULL;
 472    struct gl_vertex_program *vprog = NULL;
 473    GLbitfield enabledFragUnits = 0x0;
 474
 475    if (ctx->Shader.CurrentProgram &&
 476        ctx->Shader.CurrentProgram->LinkStatus) {
 477       fprog = ctx->Shader.CurrentProgram->FragmentProgram;
 478       vprog = ctx->Shader.CurrentProgram->VertexProgram;
 479    }
 480    else {
 481       if (ctx->FragmentProgram._Enabled) {
 482          fprog = ctx->FragmentProgram.Current;
 483       }
 484       if (ctx->VertexProgram._Enabled) {
 485          /* XXX enable this if/when non-shader vertex programs get
 486           * texture fetches:
 487          vprog = ctx->VertexProgram.Current;
 488          */
 489       }
 490    }
 491
 492    /* TODO: only set this if there are actual changes */
 493    ctx->NewState |= _NEW_TEXTURE;
 494
 495    ctx->Texture._EnabledUnits = 0x0;
 496    ctx->Texture._GenFlags = 0x0;
 497    ctx->Texture._TexMatEnabled = 0x0;
 498    ctx->Texture._TexGenEnabled = 0x0;
 499
 500    /*
 501     * Update texture unit state.
 502     */
 503    for (unit = 0; unit < ctx->Const.MaxTextureImageUnits; unit++) {
 504       struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 505       GLbitfield enabledVertTargets = 0x0;
 506       GLbitfield enabledFragTargets = 0x0;
 507       GLbitfield enabledTargets = 0x0;
 508       GLuint texIndex;
 509
 510       /* Get the bitmask of texture target enables.
 511        * enableBits will be a mask of the TEXTURE_*_BIT flags indicating
 512        * which texture targets are enabled (fixed function) or referenced
 513        * by a fragment shader/program.  When multiple flags are set, we'll
 514        * settle on the one with highest priority (see below).
 515        */
 516       if (vprog) {
 517          enabledVertTargets |= vprog->Base.TexturesUsed[unit];
 518       }
 519
 520       if (fprog) {
 521          enabledFragTargets |= fprog->Base.TexturesUsed[unit];
 522       }
 523       else {
 524          /* fixed-function fragment program */
 525          enabledFragTargets |= texUnit->Enabled;
 526       }
 527
 528       enabledTargets = enabledVertTargets | enabledFragTargets;
 529
 530       texUnit->_ReallyEnabled = 0x0;
 531
 532       if (enabledTargets == 0x0) {
 533          /* neither vertex nor fragment processing uses this unit */
 534          continue;
 535       }
 536
 537       /* Look for the highest priority texture target that's enabled (or used
 538        * by the vert/frag shaders) and "complete".  That's the one we'll use
 539        * for texturing.  If we're using vert/frag program we're guaranteed
 540        * that bitcount(enabledBits) <= 1.
 541        * Note that the TEXTURE_x_INDEX values are in high to low priority.
 542        */
 543       for (texIndex = 0; texIndex < NUM_TEXTURE_TARGETS; texIndex++) {
 544          if (enabledTargets & (1 << texIndex)) {
 545             struct gl_texture_object *texObj = texUnit->CurrentTex[texIndex];
 546             if (!texObj->_Complete) {
 547                _mesa_test_texobj_completeness(ctx, texObj);
 548             }
 549             if (texObj->_Complete) {
 550                texUnit->_ReallyEnabled = 1 << texIndex;
 551                _mesa_reference_texobj(&texUnit->_Current, texObj);
 552                break;
 553             }
 554          }
 555       }
 556
 557       if (!texUnit->_ReallyEnabled) {
 558          _mesa_reference_texobj(&texUnit->_Current, NULL);
 559          continue;
 560       }
 561
 562       /* if we get here, we know this texture unit is enabled */
 563
 564       ctx->Texture._EnabledUnits |= (1 << unit);
 565
 566       if (enabledFragTargets)
 567          enabledFragUnits |= (1 << unit);
 568
 569       update_tex_combine(ctx, texUnit);
 570    }
 571
 572
 573    /* Determine which texture coordinate sets are actually needed */
 574    if (fprog) {
 575       const GLuint coordMask = (1 << MAX_TEXTURE_COORD_UNITS) - 1;
 576       ctx->Texture._EnabledCoordUnits
 577          = (fprog->Base.InputsRead >> FRAG_ATTRIB_TEX0) & coordMask;
 578    }
 579    else {
 580       ctx->Texture._EnabledCoordUnits = enabledFragUnits;
 581    }
 582
 583    /* Setup texgen for those texture coordinate sets that are in use */
 584    for (unit = 0; unit < ctx->Const.MaxTextureCoordUnits; unit++) {
 585       struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 586
 587       texUnit->_GenFlags = 0x0;
 588
 589       if (!(ctx->Texture._EnabledCoordUnits & (1 << unit)))
 590          continue;
 591
 592       if (texUnit->TexGenEnabled) {
 593          if (texUnit->TexGenEnabled & S_BIT) {
 594             texUnit->_GenFlags |= texUnit->GenS._ModeBit;
 595          }
 596          if (texUnit->TexGenEnabled & T_BIT) {
 597             texUnit->_GenFlags |= texUnit->GenT._ModeBit;
 598          }
 599          if (texUnit->TexGenEnabled & R_BIT) {
 600             texUnit->_GenFlags |= texUnit->GenR._ModeBit;
 601          }
 602          if (texUnit->TexGenEnabled & Q_BIT) {
 603             texUnit->_GenFlags |= texUnit->GenQ._ModeBit;
 604          }
 605
 606          ctx->Texture._TexGenEnabled |= ENABLE_TEXGEN(unit);
 607          ctx->Texture._GenFlags |= texUnit->_GenFlags;
 608       }
 609
 610       if (ctx->TextureMatrixStack[unit].Top->type != MATRIX_IDENTITY)
 611          ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(unit);
 612    }
 613 }
 614
 615
 616 /**
 617  * Update texture-related derived state.
 618  */
 619 void
 620 _mesa_update_texture( GLcontext *ctx, GLuint new_state )
 621 {
 622    if (new_state & _NEW_TEXTURE_MATRIX)
 623       update_texture_matrices( ctx );
 624
 625    if (new_state & (_NEW_TEXTURE | _NEW_PROGRAM))
 626       update_texture_state( ctx );
 627 }
 628
 629
 630 /**********************************************************************/
 631 /*****                      Initialization                        *****/
 632 /**********************************************************************/
 633
 634 /**
 635  * Allocate the proxy textures for the given context.
 636  *
 637  * \param ctx the context to allocate proxies for.
 638  *
 639  * \return GL_TRUE on success, or GL_FALSE on failure
 640  *
 641  * If run out of memory part way through the allocations, clean up and return
 642  * GL_FALSE.
 643  */
 644 static GLboolean
 645 alloc_proxy_textures( GLcontext *ctx )
 646 {
 647    static const GLenum targets[] = {
 648       GL_TEXTURE_1D,
 649       GL_TEXTURE_2D,
 650       GL_TEXTURE_3D,
 651       GL_TEXTURE_CUBE_MAP_ARB,
 652       GL_TEXTURE_RECTANGLE_NV,
 653       GL_TEXTURE_1D_ARRAY_EXT,
 654       GL_TEXTURE_2D_ARRAY_EXT
 655    };
 656    GLint tgt;
 657
 658    ASSERT(Elements(targets) == NUM_TEXTURE_TARGETS);
 659
 660    for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
 661       if (!(ctx->Texture.ProxyTex[tgt]
 662             = ctx->Driver.NewTextureObject(ctx, 0, targets[tgt]))) {
 663          /* out of memory, free what we did allocate */
 664          while (--tgt >= 0) {
 665             ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]);
 666          }
 667          return GL_FALSE;
 668       }
 669    }
 670
 671    assert(ctx->Texture.ProxyTex[0]->RefCount == 1); /* sanity check */
 672    return GL_TRUE;
 673 }
 674
 675
 676 /**
 677  * Initialize a texture unit.
 678  *
 679  * \param ctx GL context.
 680  * \param unit texture unit number to be initialized.
 681  */
 682 static void
 683 init_texture_unit( GLcontext *ctx, GLuint unit )
 684 {
 685    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 686    GLuint tex;
 687
 688    texUnit->EnvMode = GL_MODULATE;
 689    ASSIGN_4V( texUnit->EnvColor, 0.0, 0.0, 0.0, 0.0 );
 690
 691    texUnit->Combine = default_combine_state;
 692    texUnit->_EnvMode = default_combine_state;
 693    texUnit->_CurrentCombine = & texUnit->_EnvMode;
 694    texUnit->BumpTarget = GL_TEXTURE0;
 695
 696    texUnit->TexGenEnabled = 0x0;
 697    texUnit->GenS.Mode = GL_EYE_LINEAR;
 698    texUnit->GenT.Mode = GL_EYE_LINEAR;
 699    texUnit->GenR.Mode = GL_EYE_LINEAR;
 700    texUnit->GenQ.Mode = GL_EYE_LINEAR;
 701    texUnit->GenS._ModeBit = TEXGEN_EYE_LINEAR;
 702    texUnit->GenT._ModeBit = TEXGEN_EYE_LINEAR;
 703    texUnit->GenR._ModeBit = TEXGEN_EYE_LINEAR;
 704    texUnit->GenQ._ModeBit = TEXGEN_EYE_LINEAR;
 705
 706    /* Yes, these plane coefficients are correct! */
 707    ASSIGN_4V( texUnit->GenS.ObjectPlane, 1.0, 0.0, 0.0, 0.0 );
 708    ASSIGN_4V( texUnit->GenT.ObjectPlane, 0.0, 1.0, 0.0, 0.0 );
 709    ASSIGN_4V( texUnit->GenR.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
 710    ASSIGN_4V( texUnit->GenQ.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
 711    ASSIGN_4V( texUnit->GenS.EyePlane, 1.0, 0.0, 0.0, 0.0 );
 712    ASSIGN_4V( texUnit->GenT.EyePlane, 0.0, 1.0, 0.0, 0.0 );
 713    ASSIGN_4V( texUnit->GenR.EyePlane, 0.0, 0.0, 0.0, 0.0 );
 714    ASSIGN_4V( texUnit->GenQ.EyePlane, 0.0, 0.0, 0.0, 0.0 );
 715    ASSIGN_4V( texUnit->GenS.ObjectPlane, 1.0, 0.0, 0.0, 0.0 );
 716    ASSIGN_4V( texUnit->GenT.ObjectPlane, 0.0, 1.0, 0.0, 0.0 );
 717    ASSIGN_4V( texUnit->GenR.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
 718    ASSIGN_4V( texUnit->GenQ.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
 719    ASSIGN_4V( texUnit->GenS.EyePlane, 1.0, 0.0, 0.0, 0.0 );
 720    ASSIGN_4V( texUnit->GenT.EyePlane, 0.0, 1.0, 0.0, 0.0 );
 721    ASSIGN_4V( texUnit->GenR.EyePlane, 0.0, 0.0, 0.0, 0.0 );
 722    ASSIGN_4V( texUnit->GenQ.EyePlane, 0.0, 0.0, 0.0, 0.0 );
 723    /* no mention of this in spec, but maybe id matrix expected? */
 724    ASSIGN_4V( texUnit->RotMatrix, 1.0, 0.0, 0.0, 1.0 );
 725
 726    /* initialize current texture object ptrs to the shared default objects */
 727    for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 728       _mesa_reference_texobj(&texUnit->CurrentTex[tex],
 729                              ctx->Shared->DefaultTex[tex]);
 730    }
 731 }
 732
 733
 734 /**
 735  * Initialize texture state for the given context.
 736  */
 737 GLboolean
 738 _mesa_init_texture(GLcontext *ctx)
 739 {
 740    GLuint u;
 741
 742    /* Texture group */
 743    ctx->Texture.CurrentUnit = 0;      /* multitexture */
 744    ctx->Texture._EnabledUnits = 0x0;
 745    ctx->Texture.SharedPalette = GL_FALSE;
 746 #if FEATURE_colortable
 747    _mesa_init_colortable(&ctx->Texture.Palette);
 748 #endif
 749
 750    for (u = 0; u < MAX_TEXTURE_UNITS; u++)
 751       init_texture_unit(ctx, u);
 752
 753    /* After we're done initializing the context's texture state the default
 754     * texture objects' refcounts should be at least MAX_TEXTURE_UNITS + 1.
 755     */
 756    assert(ctx->Shared->DefaultTex[TEXTURE_1D_INDEX]->RefCount
 757           >= MAX_TEXTURE_UNITS + 1);
 758
 759    /* Allocate proxy textures */
 760    if (!alloc_proxy_textures( ctx ))
 761       return GL_FALSE;
 762
 763    return GL_TRUE;
 764 }
 765
 766
 767 /**
 768  * Free dynamically-allocted texture data attached to the given context.
 769  */
 770 void
 771 _mesa_free_texture_data(GLcontext *ctx)
 772 {
 773    GLuint u, tgt;
 774
 775    /* unreference current textures */
 776    for (u = 0; u < MAX_TEXTURE_IMAGE_UNITS; u++) {
 777       for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
 778          _mesa_reference_texobj(&ctx->Texture.Unit[u].CurrentTex[tgt], NULL);
 779       }
 780    }
 781
 782    /* Free proxy texture objects */
 783    for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++)
 784       ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]);
 785
 786 #if FEATURE_colortable
 787    for (u = 0; u < MAX_TEXTURE_IMAGE_UNITS; u++)
 788       _mesa_free_colortable_data(&ctx->Texture.Unit[u].ColorTable);
 789 #endif
 790 }
 791
 792
 793 /**
 794  * Update the default texture objects in the given context to reference those
 795  * specified in the shared state and release those referencing the old
 796  * shared state.
 797  */
 798 void
 799 _mesa_update_default_objects_texture(GLcontext *ctx)
 800 {
 801    GLuint u, tex;
 802
 803    for (u = 0; u < MAX_TEXTURE_UNITS; u++) {
 804       struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u];
 805       for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 806          _mesa_reference_texobj(&texUnit->CurrentTex[tex],
 807                                 ctx->Shared->DefaultTex[tex]);
 808       }
 809    }
 810 }