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 "bufferobj.h"
  34 #include "colormac.h"
  35 #include "colortab.h"
  36 #include "context.h"
  37 #include "enums.h"
  38 #include "macros.h"
  39 #include "texobj.h"
  40 #include "teximage.h"
  41 #include "texstate.h"
  42 #include "mtypes.h"
  43
  44
  45
  46 /**
  47  * Default texture combine environment state.  This is used to initialize
  48  * a context's texture units and as the basis for converting "classic"
  49  * texture environmnets to ARB_texture_env_combine style values.
  50  */
  51 static const struct gl_tex_env_combine_state default_combine_state = {
  52    GL_MODULATE, GL_MODULATE,
  53    { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
  54    { GL_TEXTURE, GL_PREVIOUS, GL_CONSTANT, GL_CONSTANT },
  55    { GL_SRC_COLOR, GL_SRC_COLOR, GL_SRC_ALPHA, GL_SRC_ALPHA },
  56    { GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA },
  57    0, 0,
  58    2, 2
  59 };
  60
  61
  62
  63 /**
  64  * Used by glXCopyContext to copy texture state from one context to another.
  65  */
  66 void
  67 _mesa_copy_texture_state( const struct gl_context *src, struct gl_context *dst )
  68 {
  69    GLuint u, tex;
  70
  71    ASSERT(src);
  72    ASSERT(dst);
  73
  74    dst->Texture.CurrentUnit = src->Texture.CurrentUnit;
  75    dst->Texture._GenFlags = src->Texture._GenFlags;
  76    dst->Texture._TexGenEnabled = src->Texture._TexGenEnabled;
  77    dst->Texture._TexMatEnabled = src->Texture._TexMatEnabled;
  78    dst->Texture.SharedPalette = src->Texture.SharedPalette;
  79
  80    /* per-unit state */
  81    for (u = 0; u < src->Const.MaxCombinedTextureImageUnits; u++) {
  82       dst->Texture.Unit[u].Enabled = src->Texture.Unit[u].Enabled;
  83       dst->Texture.Unit[u].EnvMode = src->Texture.Unit[u].EnvMode;
  84       COPY_4V(dst->Texture.Unit[u].EnvColor, src->Texture.Unit[u].EnvColor);
  85       dst->Texture.Unit[u].TexGenEnabled = src->Texture.Unit[u].TexGenEnabled;
  86       dst->Texture.Unit[u].GenS = src->Texture.Unit[u].GenS;
  87       dst->Texture.Unit[u].GenT = src->Texture.Unit[u].GenT;
  88       dst->Texture.Unit[u].GenR = src->Texture.Unit[u].GenR;
  89       dst->Texture.Unit[u].GenQ = src->Texture.Unit[u].GenQ;
  90       dst->Texture.Unit[u].LodBias = src->Texture.Unit[u].LodBias;
  91
  92       /* GL_EXT_texture_env_combine */
  93       dst->Texture.Unit[u].Combine = src->Texture.Unit[u].Combine;
  94
  95       /* GL_ATI_envmap_bumpmap - need this? */
  96       dst->Texture.Unit[u].BumpTarget = src->Texture.Unit[u].BumpTarget;
  97       COPY_4V(dst->Texture.Unit[u].RotMatrix, src->Texture.Unit[u].RotMatrix);
  98
  99       /*
 100        * XXX strictly speaking, we should compare texture names/ids and
 101        * bind textures in the dest context according to id.  For now, only
 102        * copy bindings if the contexts share the same pool of textures to
 103        * avoid refcounting bugs.
 104        */
 105       if (dst->Shared == src->Shared) {
 106          /* copy texture object bindings, not contents of texture objects */
 107          _mesa_lock_context_textures(dst);
 108
 109          for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 110             _mesa_reference_texobj(&dst->Texture.Unit[u].CurrentTex[tex],
 111                                    src->Texture.Unit[u].CurrentTex[tex]);
 112          }
 113          _mesa_unlock_context_textures(dst);
 114       }
 115    }
 116 }
 117
 118
 119 /*
 120  * For debugging
 121  */
 122 void
 123 _mesa_print_texunit_state( struct gl_context *ctx, GLuint unit )
 124 {
 125    const struct gl_texture_unit *texUnit = ctx->Texture.Unit + unit;
 126    printf("Texture Unit %d\n", unit);
 127    printf("  GL_TEXTURE_ENV_MODE = %s\n", _mesa_lookup_enum_by_nr(texUnit->EnvMode));
 128    printf("  GL_COMBINE_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeRGB));
 129    printf("  GL_COMBINE_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.ModeA));
 130    printf("  GL_SOURCE0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[0]));
 131    printf("  GL_SOURCE1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[1]));
 132    printf("  GL_SOURCE2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceRGB[2]));
 133    printf("  GL_SOURCE0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[0]));
 134    printf("  GL_SOURCE1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[1]));
 135    printf("  GL_SOURCE2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.SourceA[2]));
 136    printf("  GL_OPERAND0_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[0]));
 137    printf("  GL_OPERAND1_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[1]));
 138    printf("  GL_OPERAND2_RGB = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandRGB[2]));
 139    printf("  GL_OPERAND0_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[0]));
 140    printf("  GL_OPERAND1_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[1]));
 141    printf("  GL_OPERAND2_ALPHA = %s\n", _mesa_lookup_enum_by_nr(texUnit->Combine.OperandA[2]));
 142    printf("  GL_RGB_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftRGB);
 143    printf("  GL_ALPHA_SCALE = %d\n", 1 << texUnit->Combine.ScaleShiftA);
 144    printf("  GL_TEXTURE_ENV_COLOR = (%f, %f, %f, %f)\n", texUnit->EnvColor[0], texUnit->EnvColor[1], texUnit->EnvColor[2], texUnit->EnvColor[3]);
 145 }
 146
 147
 148
 149 /**********************************************************************/
 150 /*                       Texture Environment                          */
 151 /**********************************************************************/
 152
 153 /**
 154  * Convert "classic" texture environment to ARB_texture_env_combine style
 155  * environments.
 156  *
 157  * \param state  texture_env_combine state vector to be filled-in.
 158  * \param mode   Classic texture environment mode (i.e., \c GL_REPLACE,
 159  *               \c GL_BLEND, \c GL_DECAL, etc.).
 160  * \param texBaseFormat  Base format of the texture associated with the
 161  *               texture unit.
 162  */
 163 static void
 164 calculate_derived_texenv( struct gl_tex_env_combine_state *state,
 165                           GLenum mode, GLenum texBaseFormat )
 166 {
 167    GLenum mode_rgb;
 168    GLenum mode_a;
 169
 170    *state = default_combine_state;
 171
 172    switch (texBaseFormat) {
 173    case GL_ALPHA:
 174       state->SourceRGB[0] = GL_PREVIOUS;
 175       break;
 176
 177    case GL_LUMINANCE_ALPHA:
 178    case GL_INTENSITY:
 179    case GL_RGBA:
 180       break;
 181
 182    case GL_LUMINANCE:
 183    case GL_RED:
 184    case GL_RG:
 185    case GL_RGB:
 186    case GL_YCBCR_MESA:
 187    case GL_DUDV_ATI:
 188       state->SourceA[0] = GL_PREVIOUS;
 189       break;
 190
 191    default:
 192       _mesa_problem(NULL,
 193                     "Invalid texBaseFormat 0x%x in calculate_derived_texenv",
 194                     texBaseFormat);
 195       return;
 196    }
 197
 198    if (mode == GL_REPLACE_EXT)
 199       mode = GL_REPLACE;
 200
 201    switch (mode) {
 202    case GL_REPLACE:
 203    case GL_MODULATE:
 204       mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : mode;
 205       mode_a   = mode;
 206       break;
 207
 208    case GL_DECAL:
 209       mode_rgb = GL_INTERPOLATE;
 210       mode_a   = GL_REPLACE;
 211
 212       state->SourceA[0] = GL_PREVIOUS;
 213
 214       /* Having alpha / luminance / intensity textures replace using the
 215        * incoming fragment color matches the definition in NV_texture_shader.
 216        * The 1.5 spec simply marks these as "undefined".
 217        */
 218       switch (texBaseFormat) {
 219       case GL_ALPHA:
 220       case GL_LUMINANCE:
 221       case GL_LUMINANCE_ALPHA:
 222       case GL_INTENSITY:
 223          state->SourceRGB[0] = GL_PREVIOUS;
 224          break;
 225       case GL_RED:
 226       case GL_RG:
 227       case GL_RGB:
 228       case GL_YCBCR_MESA:
 229       case GL_DUDV_ATI:
 230          mode_rgb = GL_REPLACE;
 231          break;
 232       case GL_RGBA:
 233          state->SourceRGB[2] = GL_TEXTURE;
 234          break;
 235       }
 236       break;
 237
 238    case GL_BLEND:
 239       mode_rgb = GL_INTERPOLATE;
 240       mode_a   = GL_MODULATE;
 241
 242       switch (texBaseFormat) {
 243       case GL_ALPHA:
 244          mode_rgb = GL_REPLACE;
 245          break;
 246       case GL_INTENSITY:
 247          mode_a = GL_INTERPOLATE;
 248          state->SourceA[0] = GL_CONSTANT;
 249          state->OperandA[2] = GL_SRC_ALPHA;
 250          /* FALLTHROUGH */
 251       case GL_LUMINANCE:
 252       case GL_RED:
 253       case GL_RG:
 254       case GL_RGB:
 255       case GL_LUMINANCE_ALPHA:
 256       case GL_RGBA:
 257       case GL_YCBCR_MESA:
 258       case GL_DUDV_ATI:
 259          state->SourceRGB[2] = GL_TEXTURE;
 260          state->SourceA[2]   = GL_TEXTURE;
 261          state->SourceRGB[0] = GL_CONSTANT;
 262          state->OperandRGB[2] = GL_SRC_COLOR;
 263          break;
 264       }
 265       break;
 266
 267    case GL_ADD:
 268       mode_rgb = (texBaseFormat == GL_ALPHA) ? GL_REPLACE : GL_ADD;
 269       mode_a   = (texBaseFormat == GL_INTENSITY) ? GL_ADD : GL_MODULATE;
 270       break;
 271
 272    default:
 273       _mesa_problem(NULL,
 274                     "Invalid texture env mode 0x%x in calculate_derived_texenv",
 275                     mode);
 276       return;
 277    }
 278
 279    state->ModeRGB = (state->SourceRGB[0] != GL_PREVIOUS)
 280        ? mode_rgb : GL_REPLACE;
 281    state->ModeA   = (state->SourceA[0]   != GL_PREVIOUS)
 282        ? mode_a   : GL_REPLACE;
 283 }
 284
 285
 286
 287
 288 /* GL_ARB_multitexture */
 289 void GLAPIENTRY
 290 _mesa_ActiveTextureARB(GLenum texture)
 291 {
 292    const GLuint texUnit = texture - GL_TEXTURE0;
 293    GLuint k;
 294    GET_CURRENT_CONTEXT(ctx);
 295
 296    /* See OpenGL spec for glActiveTexture: */
 297    k = MAX2(ctx->Const.MaxCombinedTextureImageUnits,
 298             ctx->Const.MaxTextureCoordUnits);
 299
 300    ASSERT(k <= Elements(ctx->Texture.Unit));
 301
 302    ASSERT_OUTSIDE_BEGIN_END(ctx);
 303
 304    if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
 305       _mesa_debug(ctx, "glActiveTexture %s\n",
 306                   _mesa_lookup_enum_by_nr(texture));
 307
 308    if (texUnit >= k) {
 309       _mesa_error(ctx, GL_INVALID_ENUM, "glActiveTexture(texture=%s)",
 310                   _mesa_lookup_enum_by_nr(texture));
 311       return;
 312    }
 313
 314    if (ctx->Texture.CurrentUnit == texUnit)
 315       return;
 316
 317    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 318
 319    ctx->Texture.CurrentUnit = texUnit;
 320    if (ctx->Transform.MatrixMode == GL_TEXTURE) {
 321       /* update current stack pointer */
 322       ctx->CurrentStack = &ctx->TextureMatrixStack[texUnit];
 323    }
 324 }
 325
 326
 327 /* GL_ARB_multitexture */
 328 void GLAPIENTRY
 329 _mesa_ClientActiveTextureARB(GLenum texture)
 330 {
 331    GET_CURRENT_CONTEXT(ctx);
 332    GLuint texUnit = texture - GL_TEXTURE0;
 333    ASSERT_OUTSIDE_BEGIN_END(ctx);
 334
 335    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE))
 336       _mesa_debug(ctx, "glClientActiveTexture %s\n",
 337                   _mesa_lookup_enum_by_nr(texture));
 338
 339    if (texUnit >= ctx->Const.MaxTextureCoordUnits) {
 340       _mesa_error(ctx, GL_INVALID_ENUM, "glClientActiveTexture(texture)");
 341       return;
 342    }
 343
 344    if (ctx->Array.ActiveTexture == texUnit)
 345       return;
 346
 347    FLUSH_VERTICES(ctx, _NEW_ARRAY);
 348    ctx->Array.ActiveTexture = texUnit;
 349 }
 350
 351
 352
 353 /**********************************************************************/
 354 /*****                    State management                        *****/
 355 /**********************************************************************/
 356
 357
 358 /**
 359  * \note This routine refers to derived texture attribute values to
 360  * compute the ENABLE_TEXMAT flags, but is only called on
 361  * _NEW_TEXTURE_MATRIX.  On changes to _NEW_TEXTURE, the ENABLE_TEXMAT
 362  * flags are updated by _mesa_update_textures(), below.
 363  *
 364  * \param ctx GL context.
 365  */
 366 static void
 367 update_texture_matrices( struct gl_context *ctx )
 368 {
 369    GLuint u;
 370
 371    ctx->Texture._TexMatEnabled = 0x0;
 372
 373    for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
 374       ASSERT(u < Elements(ctx->TextureMatrixStack));
 375       if (_math_matrix_is_dirty(ctx->TextureMatrixStack[u].Top)) {
 376          _math_matrix_analyse( ctx->TextureMatrixStack[u].Top );
 377
 378          if (ctx->Texture.Unit[u]._ReallyEnabled &&
 379              ctx->TextureMatrixStack[u].Top->type != MATRIX_IDENTITY)
 380             ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(u);
 381       }
 382    }
 383 }
 384
 385
 386 /**
 387  * Examine texture unit's combine/env state to update derived state.
 388  */
 389 static void
 390 update_tex_combine(struct gl_context *ctx, struct gl_texture_unit *texUnit)
 391 {
 392    struct gl_tex_env_combine_state *combine;
 393
 394    /* Set the texUnit->_CurrentCombine field to point to the user's combiner
 395     * state, or the combiner state which is derived from traditional texenv
 396     * mode.
 397     */
 398    if (texUnit->EnvMode == GL_COMBINE ||
 399        texUnit->EnvMode == GL_COMBINE4_NV) {
 400       texUnit->_CurrentCombine = & texUnit->Combine;
 401    }
 402    else {
 403       const struct gl_texture_object *texObj = texUnit->_Current;
 404       GLenum format = texObj->Image[0][texObj->BaseLevel]->_BaseFormat;
 405       if (format == GL_COLOR_INDEX) {
 406          format = GL_RGBA;  /* a bit of a hack */
 407       }
 408       else if (format == GL_DEPTH_COMPONENT ||
 409                format == GL_DEPTH_STENCIL_EXT) {
 410          format = texObj->Sampler.DepthMode;
 411       }
 412       calculate_derived_texenv(&texUnit->_EnvMode, texUnit->EnvMode, format);
 413       texUnit->_CurrentCombine = & texUnit->_EnvMode;
 414    }
 415
 416    combine = texUnit->_CurrentCombine;
 417
 418    /* Determine number of source RGB terms in the combiner function */
 419    switch (combine->ModeRGB) {
 420    case GL_REPLACE:
 421       combine->_NumArgsRGB = 1;
 422       break;
 423    case GL_ADD:
 424    case GL_ADD_SIGNED:
 425       if (texUnit->EnvMode == GL_COMBINE4_NV)
 426          combine->_NumArgsRGB = 4;
 427       else
 428          combine->_NumArgsRGB = 2;
 429       break;
 430    case GL_MODULATE:
 431    case GL_SUBTRACT:
 432    case GL_DOT3_RGB:
 433    case GL_DOT3_RGBA:
 434    case GL_DOT3_RGB_EXT:
 435    case GL_DOT3_RGBA_EXT:
 436       combine->_NumArgsRGB = 2;
 437       break;
 438    case GL_INTERPOLATE:
 439    case GL_MODULATE_ADD_ATI:
 440    case GL_MODULATE_SIGNED_ADD_ATI:
 441    case GL_MODULATE_SUBTRACT_ATI:
 442       combine->_NumArgsRGB = 3;
 443       break;
 444    case GL_BUMP_ENVMAP_ATI:
 445       /* no real arguments for this case */
 446       combine->_NumArgsRGB = 0;
 447       break;
 448    default:
 449       combine->_NumArgsRGB = 0;
 450       _mesa_problem(ctx, "invalid RGB combine mode in update_texture_state");
 451       return;
 452    }
 453
 454    /* Determine number of source Alpha terms in the combiner function */
 455    switch (combine->ModeA) {
 456    case GL_REPLACE:
 457       combine->_NumArgsA = 1;
 458       break;
 459    case GL_ADD:
 460    case GL_ADD_SIGNED:
 461       if (texUnit->EnvMode == GL_COMBINE4_NV)
 462          combine->_NumArgsA = 4;
 463       else
 464          combine->_NumArgsA = 2;
 465       break;
 466    case GL_MODULATE:
 467    case GL_SUBTRACT:
 468       combine->_NumArgsA = 2;
 469       break;
 470    case GL_INTERPOLATE:
 471    case GL_MODULATE_ADD_ATI:
 472    case GL_MODULATE_SIGNED_ADD_ATI:
 473    case GL_MODULATE_SUBTRACT_ATI:
 474       combine->_NumArgsA = 3;
 475       break;
 476    default:
 477       combine->_NumArgsA = 0;
 478       _mesa_problem(ctx, "invalid Alpha combine mode in update_texture_state");
 479       break;
 480    }
 481 }
 482
 483
 484 /**
 485  * \note This routine refers to derived texture matrix values to
 486  * compute the ENABLE_TEXMAT flags, but is only called on
 487  * _NEW_TEXTURE.  On changes to _NEW_TEXTURE_MATRIX, the ENABLE_TEXMAT
 488  * flags are updated by _mesa_update_texture_matrices, above.
 489  *
 490  * \param ctx GL context.
 491  */
 492 static void
 493 update_texture_state( struct gl_context *ctx )
 494 {
 495    GLuint unit;
 496    struct gl_fragment_program *fprog = NULL;
 497    struct gl_vertex_program *vprog = NULL;
 498    GLbitfield enabledFragUnits = 0x0;
 499
 500    if (ctx->Shader.CurrentVertexProgram &&
 501        ctx->Shader.CurrentVertexProgram->LinkStatus) {
 502       vprog = ctx->Shader.CurrentVertexProgram->VertexProgram;
 503    } else if (ctx->VertexProgram._Enabled) {
 504       /* XXX enable this if/when non-shader vertex programs get
 505        * texture fetches:
 506        vprog = ctx->VertexProgram.Current;
 507        */
 508    }
 509
 510    if (ctx->Shader.CurrentFragmentProgram &&
 511        ctx->Shader.CurrentFragmentProgram->LinkStatus) {
 512       fprog = ctx->Shader.CurrentFragmentProgram->FragmentProgram;
 513    }
 514    else if (ctx->FragmentProgram._Enabled) {
 515       fprog = ctx->FragmentProgram.Current;
 516    }
 517
 518    /* FINISHME: Geometry shader texture accesses should also be considered
 519     * FINISHME: here.
 520     */
 521
 522    /* TODO: only set this if there are actual changes */
 523    ctx->NewState |= _NEW_TEXTURE;
 524
 525    ctx->Texture._EnabledUnits = 0x0;
 526    ctx->Texture._GenFlags = 0x0;
 527    ctx->Texture._TexMatEnabled = 0x0;
 528    ctx->Texture._TexGenEnabled = 0x0;
 529
 530    /*
 531     * Update texture unit state.
 532     */
 533    for (unit = 0; unit < ctx->Const.MaxCombinedTextureImageUnits; unit++) {
 534       struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 535       GLbitfield enabledVertTargets = 0x0;
 536       GLbitfield enabledFragTargets = 0x0;
 537       GLbitfield enabledTargets = 0x0;
 538       GLuint texIndex;
 539
 540       /* Get the bitmask of texture target enables.
 541        * enableBits will be a mask of the TEXTURE_*_BIT flags indicating
 542        * which texture targets are enabled (fixed function) or referenced
 543        * by a fragment program/program.  When multiple flags are set, we'll
 544        * settle on the one with highest priority (see below).
 545        */
 546       if (vprog) {
 547          enabledVertTargets |= vprog->Base.TexturesUsed[unit];
 548       }
 549
 550       if (fprog) {
 551          enabledFragTargets |= fprog->Base.TexturesUsed[unit];
 552       }
 553       else {
 554          /* fixed-function fragment program */
 555          enabledFragTargets |= texUnit->Enabled;
 556       }
 557
 558       enabledTargets = enabledVertTargets | enabledFragTargets;
 559
 560       texUnit->_ReallyEnabled = 0x0;
 561
 562       if (enabledTargets == 0x0) {
 563          /* neither vertex nor fragment processing uses this unit */
 564          continue;
 565       }
 566
 567       /* Look for the highest priority texture target that's enabled (or used
 568        * by the vert/frag shaders) and "complete".  That's the one we'll use
 569        * for texturing.  If we're using vert/frag program we're guaranteed
 570        * that bitcount(enabledBits) <= 1.
 571        * Note that the TEXTURE_x_INDEX values are in high to low priority.
 572        */
 573       for (texIndex = 0; texIndex < NUM_TEXTURE_TARGETS; texIndex++) {
 574          if (enabledTargets & (1 << texIndex)) {
 575             struct gl_texture_object *texObj = texUnit->CurrentTex[texIndex];
 576             if (!texObj->_Complete) {
 577                _mesa_test_texobj_completeness(ctx, texObj);
 578             }
 579             if (texObj->_Complete) {
 580                texUnit->_ReallyEnabled = 1 << texIndex;
 581                _mesa_reference_texobj(&texUnit->_Current, texObj);
 582                break;
 583             }
 584          }
 585       }
 586
 587       if (!texUnit->_ReallyEnabled) {
 588          if (fprog) {
 589             /* If we get here it means the shader is expecting a texture
 590              * object, but there isn't one (or it's incomplete).  Use the
 591              * fallback texture.
 592              */
 593             struct gl_texture_object *texObj = _mesa_get_fallback_texture(ctx);
 594             texUnit->_ReallyEnabled = 1 << TEXTURE_2D_INDEX;
 595             _mesa_reference_texobj(&texUnit->_Current, texObj);
 596          }
 597          else {
 598             /* fixed-function: texture unit is really disabled */
 599             continue;
 600          }
 601       }
 602
 603       /* if we get here, we know this texture unit is enabled */
 604
 605       ctx->Texture._EnabledUnits |= (1 << unit);
 606
 607       if (enabledFragTargets)
 608          enabledFragUnits |= (1 << unit);
 609
 610       update_tex_combine(ctx, texUnit);
 611    }
 612
 613
 614    /* Determine which texture coordinate sets are actually needed */
 615    if (fprog) {
 616       const GLuint coordMask = (1 << MAX_TEXTURE_COORD_UNITS) - 1;
 617       ctx->Texture._EnabledCoordUnits
 618          = (fprog->Base.InputsRead >> FRAG_ATTRIB_TEX0) & coordMask;
 619    }
 620    else {
 621       ctx->Texture._EnabledCoordUnits = enabledFragUnits;
 622    }
 623
 624    /* Setup texgen for those texture coordinate sets that are in use */
 625    for (unit = 0; unit < ctx->Const.MaxTextureCoordUnits; unit++) {
 626       struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 627
 628       texUnit->_GenFlags = 0x0;
 629
 630       if (!(ctx->Texture._EnabledCoordUnits & (1 << unit)))
 631          continue;
 632
 633       if (texUnit->TexGenEnabled) {
 634          if (texUnit->TexGenEnabled & S_BIT) {
 635             texUnit->_GenFlags |= texUnit->GenS._ModeBit;
 636          }
 637          if (texUnit->TexGenEnabled & T_BIT) {
 638             texUnit->_GenFlags |= texUnit->GenT._ModeBit;
 639          }
 640          if (texUnit->TexGenEnabled & R_BIT) {
 641             texUnit->_GenFlags |= texUnit->GenR._ModeBit;
 642          }
 643          if (texUnit->TexGenEnabled & Q_BIT) {
 644             texUnit->_GenFlags |= texUnit->GenQ._ModeBit;
 645          }
 646
 647          ctx->Texture._TexGenEnabled |= ENABLE_TEXGEN(unit);
 648          ctx->Texture._GenFlags |= texUnit->_GenFlags;
 649       }
 650
 651       ASSERT(unit < Elements(ctx->TextureMatrixStack));
 652       if (ctx->TextureMatrixStack[unit].Top->type != MATRIX_IDENTITY)
 653          ctx->Texture._TexMatEnabled |= ENABLE_TEXMAT(unit);
 654    }
 655 }
 656
 657
 658 /**
 659  * Update texture-related derived state.
 660  */
 661 void
 662 _mesa_update_texture( struct gl_context *ctx, GLuint new_state )
 663 {
 664    if (new_state & _NEW_TEXTURE_MATRIX)
 665       update_texture_matrices( ctx );
 666
 667    if (new_state & (_NEW_TEXTURE | _NEW_PROGRAM))
 668       update_texture_state( ctx );
 669 }
 670
 671
 672 /**********************************************************************/
 673 /*****                      Initialization                        *****/
 674 /**********************************************************************/
 675
 676 /**
 677  * Allocate the proxy textures for the given context.
 678  *
 679  * \param ctx the context to allocate proxies for.
 680  *
 681  * \return GL_TRUE on success, or GL_FALSE on failure
 682  *
 683  * If run out of memory part way through the allocations, clean up and return
 684  * GL_FALSE.
 685  */
 686 static GLboolean
 687 alloc_proxy_textures( struct gl_context *ctx )
 688 {
 689    static const GLenum targets[] = {
 690       GL_TEXTURE_1D,
 691       GL_TEXTURE_2D,
 692       GL_TEXTURE_3D,
 693       GL_TEXTURE_CUBE_MAP_ARB,
 694       GL_TEXTURE_RECTANGLE_NV,
 695       GL_TEXTURE_1D_ARRAY_EXT,
 696       GL_TEXTURE_2D_ARRAY_EXT,
 697       GL_TEXTURE_BUFFER
 698    };
 699    GLint tgt;
 700
 701    ASSERT(Elements(targets) == NUM_TEXTURE_TARGETS);
 702
 703    for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
 704       if (!(ctx->Texture.ProxyTex[tgt]
 705             = ctx->Driver.NewTextureObject(ctx, 0, targets[tgt]))) {
 706          /* out of memory, free what we did allocate */
 707          while (--tgt >= 0) {
 708             ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]);
 709          }
 710          return GL_FALSE;
 711       }
 712    }
 713
 714    assert(ctx->Texture.ProxyTex[0]->RefCount == 1); /* sanity check */
 715    return GL_TRUE;
 716 }
 717
 718
 719 /**
 720  * Initialize a texture unit.
 721  *
 722  * \param ctx GL context.
 723  * \param unit texture unit number to be initialized.
 724  */
 725 static void
 726 init_texture_unit( struct gl_context *ctx, GLuint unit )
 727 {
 728    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 729    GLuint tex;
 730
 731    texUnit->EnvMode = GL_MODULATE;
 732    ASSIGN_4V( texUnit->EnvColor, 0.0, 0.0, 0.0, 0.0 );
 733
 734    texUnit->Combine = default_combine_state;
 735    texUnit->_EnvMode = default_combine_state;
 736    texUnit->_CurrentCombine = & texUnit->_EnvMode;
 737    texUnit->BumpTarget = GL_TEXTURE0;
 738
 739    texUnit->TexGenEnabled = 0x0;
 740    texUnit->GenS.Mode = GL_EYE_LINEAR;
 741    texUnit->GenT.Mode = GL_EYE_LINEAR;
 742    texUnit->GenR.Mode = GL_EYE_LINEAR;
 743    texUnit->GenQ.Mode = GL_EYE_LINEAR;
 744    texUnit->GenS._ModeBit = TEXGEN_EYE_LINEAR;
 745    texUnit->GenT._ModeBit = TEXGEN_EYE_LINEAR;
 746    texUnit->GenR._ModeBit = TEXGEN_EYE_LINEAR;
 747    texUnit->GenQ._ModeBit = TEXGEN_EYE_LINEAR;
 748
 749    /* Yes, these plane coefficients are correct! */
 750    ASSIGN_4V( texUnit->GenS.ObjectPlane, 1.0, 0.0, 0.0, 0.0 );
 751    ASSIGN_4V( texUnit->GenT.ObjectPlane, 0.0, 1.0, 0.0, 0.0 );
 752    ASSIGN_4V( texUnit->GenR.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
 753    ASSIGN_4V( texUnit->GenQ.ObjectPlane, 0.0, 0.0, 0.0, 0.0 );
 754    ASSIGN_4V( texUnit->GenS.EyePlane, 1.0, 0.0, 0.0, 0.0 );
 755    ASSIGN_4V( texUnit->GenT.EyePlane, 0.0, 1.0, 0.0, 0.0 );
 756    ASSIGN_4V( texUnit->GenR.EyePlane, 0.0, 0.0, 0.0, 0.0 );
 757    ASSIGN_4V( texUnit->GenQ.EyePlane, 0.0, 0.0, 0.0, 0.0 );
 758
 759    /* no mention of this in spec, but maybe id matrix expected? */
 760    ASSIGN_4V( texUnit->RotMatrix, 1.0, 0.0, 0.0, 1.0 );
 761
 762    /* initialize current texture object ptrs to the shared default objects */
 763    for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 764       _mesa_reference_texobj(&texUnit->CurrentTex[tex],
 765                              ctx->Shared->DefaultTex[tex]);
 766    }
 767 }
 768
 769
 770 /**
 771  * Initialize texture state for the given context.
 772  */
 773 GLboolean
 774 _mesa_init_texture(struct gl_context *ctx)
 775 {
 776    GLuint u;
 777
 778    /* Texture group */
 779    ctx->Texture.CurrentUnit = 0;      /* multitexture */
 780    ctx->Texture._EnabledUnits = 0x0;
 781    ctx->Texture.SharedPalette = GL_FALSE;
 782    _mesa_init_colortable(&ctx->Texture.Palette);
 783
 784    for (u = 0; u < Elements(ctx->Texture.Unit); u++)
 785       init_texture_unit(ctx, u);
 786
 787    /* After we're done initializing the context's texture state the default
 788     * texture objects' refcounts should be at least
 789     * MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1.
 790     */
 791    assert(ctx->Shared->DefaultTex[TEXTURE_1D_INDEX]->RefCount
 792           >= MAX_COMBINED_TEXTURE_IMAGE_UNITS + 1);
 793
 794    /* Allocate proxy textures */
 795    if (!alloc_proxy_textures( ctx ))
 796       return GL_FALSE;
 797
 798    /* GL_ARB_texture_buffer_object */
 799    _mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject,
 800                                  ctx->Shared->NullBufferObj);
 801
 802    return GL_TRUE;
 803 }
 804
 805
 806 /**
 807  * Free dynamically-allocted texture data attached to the given context.
 808  */
 809 void
 810 _mesa_free_texture_data(struct gl_context *ctx)
 811 {
 812    GLuint u, tgt;
 813
 814    /* unreference current textures */
 815    for (u = 0; u < Elements(ctx->Texture.Unit); u++) {
 816       /* The _Current texture could account for another reference */
 817       _mesa_reference_texobj(&ctx->Texture.Unit[u]._Current, NULL);
 818
 819       for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) {
 820          _mesa_reference_texobj(&ctx->Texture.Unit[u].CurrentTex[tgt], NULL);
 821       }
 822    }
 823
 824    /* Free proxy texture objects */
 825    for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++)
 826       ctx->Driver.DeleteTexture(ctx, ctx->Texture.ProxyTex[tgt]);
 827
 828    /* GL_ARB_texture_buffer_object */
 829    _mesa_reference_buffer_object(ctx, &ctx->Texture.BufferObject, NULL);
 830
 831 #if FEATURE_sampler_objects
 832    for (u = 0; u < Elements(ctx->Texture.Unit); u++) {
 833       _mesa_reference_sampler_object(ctx, &ctx->Texture.Unit[u].Sampler, NULL);
 834    }
 835 #endif
 836 }
 837
 838
 839 /**
 840  * Update the default texture objects in the given context to reference those
 841  * specified in the shared state and release those referencing the old
 842  * shared state.
 843  */
 844 void
 845 _mesa_update_default_objects_texture(struct gl_context *ctx)
 846 {
 847    GLuint u, tex;
 848
 849    for (u = 0; u < Elements(ctx->Texture.Unit); u++) {
 850       struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u];
 851       for (tex = 0; tex < NUM_TEXTURE_TARGETS; tex++) {
 852          _mesa_reference_texobj(&texUnit->CurrentTex[tex],
 853                                 ctx->Shared->DefaultTex[tex]);
 854       }
 855    }
 856 }