src/mesa/main/context.c

   1 /**
   2  * \file context.c
   3  * Mesa context/visual/framebuffer management functions.
   4  * \author Brian Paul
   5  */
   6
   7 /*
   8  * Mesa 3-D graphics library
   9  * Version:  6.5
  10  *
  11  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a
  14  * copy of this software and associated documentation files (the "Software"),
  15  * to deal in the Software without restriction, including without limitation
  16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  17  * and/or sell copies of the Software, and to permit persons to whom the
  18  * Software is furnished to do so, subject to the following conditions:
  19  *
  20  * The above copyright notice and this permission notice shall be included
  21  * in all copies or substantial portions of the Software.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  24  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  26  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  27  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  28  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31
  32 /**
  33  * \mainpage Mesa Main Module
  34  *
  35  * \section MainIntroduction Introduction
  36  *
  37  * The Mesa Main module consists of all the files in the main/ directory.
  38  * Among the features of this module are:
  39  * <UL>
  40  * <LI> Structures to represent most GL state </LI>
  41  * <LI> State set/get functions </LI>
  42  * <LI> Display lists </LI>
  43  * <LI> Texture unit, object and image handling </LI>
  44  * <LI> Matrix and attribute stacks </LI>
  45  * </UL>
  46  *
  47  * Other modules are responsible for API dispatch, vertex transformation,
  48  * point/line/triangle setup, rasterization, vertex array caching,
  49  * vertex/fragment programs/shaders, etc.
  50  *
  51  *
  52  * \section AboutDoxygen About Doxygen
  53  *
  54  * If you're viewing this information as Doxygen-generated HTML you'll
  55  * see the documentation index at the top of this page.
  56  *
  57  * The first line lists the Mesa source code modules.
  58  * The second line lists the indexes available for viewing the documentation
  59  * for each module.
  60  *
  61  * Selecting the <b>Main page</b> link will display a summary of the module
  62  * (this page).
  63  *
  64  * Selecting <b>Data Structures</b> will list all C structures.
  65  *
  66  * Selecting the <b>File List</b> link will list all the source files in
  67  * the module.
  68  * Selecting a filename will show a list of all functions defined in that file.
  69  *
  70  * Selecting the <b>Data Fields</b> link will display a list of all
  71  * documented structure members.
  72  *
  73  * Selecting the <b>Globals</b> link will display a list
  74  * of all functions, structures, global variables and macros in the module.
  75  *
  76  */
  77
  78
  79 #include "glheader.h"
  80 #include "imports.h"
  81 #include "accum.h"
  82 #include "arrayobj.h"
  83 #include "attrib.h"
  84 #include "blend.h"
  85 #include "buffers.h"
  86 #include "bufferobj.h"
  87 #include "colortab.h"
  88 #include "context.h"
  89 #include "debug.h"
  90 #include "depth.h"
  91 #include "dlist.h"
  92 #include "eval.h"
  93 #include "enums.h"
  94 #include "extensions.h"
  95 #include "fbobject.h"
  96 #include "feedback.h"
  97 #include "fog.h"
  98 #include "get.h"
  99 #include "glthread.h"
 100 #include "glapioffsets.h"
 101 #include "histogram.h"
 102 #include "hint.h"
 103 #include "hash.h"
 104 #include "atifragshader.h"
 105 #include "light.h"
 106 #include "lines.h"
 107 #include "macros.h"
 108 #include "matrix.h"
 109 #include "occlude.h"
 110 #include "pixel.h"
 111 #include "points.h"
 112 #include "polygon.h"
 113 #if FEATURE_NV_vertex_program || FEATURE_NV_fragment_program
 114 #include "program.h"
 115 #endif
 116 #include "rastpos.h"
 117 #include "simple_list.h"
 118 #include "state.h"
 119 #include "stencil.h"
 120 #include "texcompress.h"
 121 #include "teximage.h"
 122 #include "texobj.h"
 123 #include "texstate.h"
 124 #include "mtypes.h"
 125 #include "varray.h"
 126 #include "version.h"
 127 #include "vtxfmt.h"
 128 #if _HAVE_FULL_GL
 129 #include "math/m_translate.h"
 130 #include "math/m_matrix.h"
 131 #include "math/m_xform.h"
 132 #include "math/mathmod.h"
 133 #endif
 134 #include "shaderobjects.h"
 135
 136 #ifdef USE_SPARC_ASM
 137 #include "sparc/sparc.h"
 138 #endif
 139
 140 #ifndef MESA_VERBOSE
 141 int MESA_VERBOSE = 0;
 142 #endif
 143
 144 #ifndef MESA_DEBUG_FLAGS
 145 int MESA_DEBUG_FLAGS = 0;
 146 #endif
 147
 148
 149 /* ubyte -> float conversion */
 150 GLfloat _mesa_ubyte_to_float_color_tab[256];
 151
 152 static void
 153 free_shared_state( GLcontext *ctx, struct gl_shared_state *ss );
 154
 155
 156 /**********************************************************************/
 157 /** \name OpenGL SI-style interface (new in Mesa 3.5)
 158  *
 159  * \if subset
 160  * \note Most of these functions are never called in the Mesa subset.
 161  * \endif
 162  */
 163 /*@{*/
 164
 165 /**
 166  * Destroy context callback.
 167  *
 168  * \param gc context.
 169  * \return GL_TRUE on success, or GL_FALSE on failure.
 170  *
 171  * \ifnot subset
 172  * Called by window system/device driver (via __GLexports::destroyCurrent) when
 173  * the rendering context is to be destroyed.
 174  * \endif
 175  *
 176  * Frees the context data and the context structure.
 177  */
 178 GLboolean
 179 _mesa_destroyContext(__GLcontext *gc)
 180 {
 181    if (gc) {
 182       _mesa_free_context_data(gc);
 183       _mesa_free(gc);
 184    }
 185    return GL_TRUE;
 186 }
 187
 188 /**
 189  * Unbind context callback.
 190  *
 191  * \param gc context.
 192  * \return GL_TRUE on success, or GL_FALSE on failure.
 193  *
 194  * \ifnot subset
 195  * Called by window system/device driver (via __GLexports::loseCurrent)
 196  * when the rendering context is made non-current.
 197  * \endif
 198  *
 199  * No-op
 200  */
 201 GLboolean
 202 _mesa_loseCurrent(__GLcontext *gc)
 203 {
 204    /* XXX unbind context from thread */
 205    (void) gc;
 206    return GL_TRUE;
 207 }
 208
 209 /**
 210  * Bind context callback.
 211  *
 212  * \param gc context.
 213  * \return GL_TRUE on success, or GL_FALSE on failure.
 214  *
 215  * \ifnot subset
 216  * Called by window system/device driver (via __GLexports::makeCurrent)
 217  * when the rendering context is made current.
 218  * \endif
 219  *
 220  * No-op
 221  */
 222 GLboolean
 223 _mesa_makeCurrent(__GLcontext *gc)
 224 {
 225    /* XXX bind context to thread */
 226    (void) gc;
 227    return GL_TRUE;
 228 }
 229
 230 /**
 231  * Share context callback.
 232  *
 233  * \param gc context.
 234  * \param gcShare shared context.
 235  * \return GL_TRUE on success, or GL_FALSE on failure.
 236  *
 237  * \ifnot subset
 238  * Called by window system/device driver (via __GLexports::shareContext)
 239  * \endif
 240  *
 241  * Update the shared context reference count, gl_shared_state::RefCount.
 242  */
 243 GLboolean
 244 _mesa_shareContext(__GLcontext *gc, __GLcontext *gcShare)
 245 {
 246    if (gc && gcShare && gc->Shared && gcShare->Shared) {
 247       gc->Shared->RefCount--;
 248       if (gc->Shared->RefCount == 0) {
 249          free_shared_state(gc, gc->Shared);
 250       }
 251       gc->Shared = gcShare->Shared;
 252       gc->Shared->RefCount++;
 253       return GL_TRUE;
 254    }
 255    else {
 256       return GL_FALSE;
 257    }
 258 }
 259
 260
 261 #if _HAVE_FULL_GL
 262 /**
 263  * Copy context callback.
 264  */
 265 GLboolean
 266 _mesa_copyContext(__GLcontext *dst, const __GLcontext *src, GLuint mask)
 267 {
 268    if (dst && src) {
 269       _mesa_copy_context( src, dst, mask );
 270       return GL_TRUE;
 271    }
 272    else {
 273       return GL_FALSE;
 274    }
 275 }
 276 #endif
 277
 278 /** No-op */
 279 GLboolean
 280 _mesa_forceCurrent(__GLcontext *gc)
 281 {
 282    (void) gc;
 283    return GL_TRUE;
 284 }
 285
 286 /**
 287  * Windows/buffer resizing notification callback.
 288  *
 289  * \param gc GL context.
 290  * \return GL_TRUE on success, or GL_FALSE on failure.
 291  */
 292 GLboolean
 293 _mesa_notifyResize(__GLcontext *gc)
 294 {
 295    GLint x, y;
 296    GLuint width, height;
 297    __GLdrawablePrivate *d = gc->imports.getDrawablePrivate(gc);
 298    if (!d || !d->getDrawableSize)
 299       return GL_FALSE;
 300    d->getDrawableSize( d, &x, &y, &width, &height );
 301    /* update viewport, resize software buffers, etc. */
 302    return GL_TRUE;
 303 }
 304
 305 /**
 306  * Window/buffer destruction notification callback.
 307  *
 308  * \param gc GL context.
 309  *
 310  * Called when the context's window/buffer is going to be destroyed.
 311  *
 312  * No-op
 313  */
 314 void
 315 _mesa_notifyDestroy(__GLcontext *gc)
 316 {
 317    /* Unbind from it. */
 318    (void) gc;
 319 }
 320
 321 /**
 322  * Swap buffers notification callback.
 323  *
 324  * \param gc GL context.
 325  *
 326  * Called by window system just before swapping buffers.
 327  * We have to finish any pending rendering.
 328  */
 329 void
 330 _mesa_notifySwapBuffers(__GLcontext *gc)
 331 {
 332    FLUSH_VERTICES( gc, 0 );
 333 }
 334
 335 /** No-op */
 336 struct __GLdispatchStateRec *
 337 _mesa_dispatchExec(__GLcontext *gc)
 338 {
 339    (void) gc;
 340    return NULL;
 341 }
 342
 343 /** No-op */
 344 void
 345 _mesa_beginDispatchOverride(__GLcontext *gc)
 346 {
 347    (void) gc;
 348 }
 349
 350 /** No-op */
 351 void
 352 _mesa_endDispatchOverride(__GLcontext *gc)
 353 {
 354    (void) gc;
 355 }
 356
 357 /**
 358  * \ifnot subset
 359  * Setup the exports.
 360  *
 361  * The window system will call these functions when it needs Mesa to do
 362  * something.
 363  *
 364  * \note Device drivers should override these functions!  For example,
 365  * the Xlib driver should plug in the XMesa*-style functions into this
 366  * structure.  The XMesa-style functions should then call the _mesa_*
 367  * version of these functions.  This is an approximation to OO design
 368  * (inheritance and virtual functions).
 369  * \endif
 370  *
 371  * \if subset
 372  * No-op.
 373  *
 374  * \endif
 375  */
 376 static void
 377 _mesa_init_default_exports(__GLexports *exports)
 378 {
 379 #if _HAVE_FULL_GL
 380     exports->destroyContext = _mesa_destroyContext;
 381     exports->loseCurrent = _mesa_loseCurrent;
 382     exports->makeCurrent = _mesa_makeCurrent;
 383     exports->shareContext = _mesa_shareContext;
 384     exports->copyContext = _mesa_copyContext;
 385     exports->forceCurrent = _mesa_forceCurrent;
 386     exports->notifyResize = _mesa_notifyResize;
 387     exports->notifyDestroy = _mesa_notifyDestroy;
 388     exports->notifySwapBuffers = _mesa_notifySwapBuffers;
 389     exports->dispatchExec = _mesa_dispatchExec;
 390     exports->beginDispatchOverride = _mesa_beginDispatchOverride;
 391     exports->endDispatchOverride = _mesa_endDispatchOverride;
 392 #else
 393     (void) exports;
 394 #endif
 395 }
 396
 397 /**
 398  * Exported OpenGL SI interface.
 399  */
 400 __GLcontext *
 401 __glCoreCreateContext(__GLimports *imports, __GLcontextModes *modes)
 402 {
 403     GLcontext *ctx;
 404
 405     ctx = (GLcontext *) (*imports->calloc)(NULL, 1, sizeof(GLcontext));
 406     if (ctx == NULL) {
 407         return NULL;
 408     }
 409
 410     /* XXX doesn't work at this time */
 411     _mesa_initialize_context(ctx, modes, NULL, NULL, NULL);
 412     ctx->imports = *imports;
 413
 414     return ctx;
 415 }
 416
 417 /**
 418  * Exported OpenGL SI interface.
 419  */
 420 void
 421 __glCoreNopDispatch(void)
 422 {
 423 #if 0
 424    /* SI */
 425    __gl_dispatch = __glNopDispatchState;
 426 #else
 427    /* Mesa */
 428    _glapi_set_dispatch(NULL);
 429 #endif
 430 }
 431
 432 /*@}*/
 433
 434
 435 /**********************************************************************/
 436 /** \name GL Visual allocation/destruction                            */
 437 /**********************************************************************/
 438 /*@{*/
 439
 440 /**
 441  * Allocates a GLvisual structure and initializes it via
 442  * _mesa_initialize_visual().
 443  *
 444  * \param rgbFlag GL_TRUE for RGB(A) mode, GL_FALSE for Color Index mode.
 445  * \param dbFlag double buffering
 446  * \param stereoFlag stereo buffer
 447  * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
 448  * is acceptable but the actual depth type will be GLushort or GLuint as
 449  * needed.
 450  * \param stencilBits requested minimum bits per stencil buffer value
 451  * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.
 452  * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
 453  * \param redBits number of bits per color component in frame buffer for RGB(A)
 454  * mode.  We always use 8 in core Mesa though.
 455  * \param greenBits same as above.
 456  * \param blueBits same as above.
 457  * \param alphaBits same as above.
 458  * \param numSamples not really used.
 459  *
 460  * \return pointer to new GLvisual or NULL if requested parameters can't be
 461  * met.
 462  *
 463  * \note Need to add params for level and numAuxBuffers (at least)
 464  */
 465 GLvisual *
 466 _mesa_create_visual( GLboolean rgbFlag,
 467                      GLboolean dbFlag,
 468                      GLboolean stereoFlag,
 469                      GLint redBits,
 470                      GLint greenBits,
 471                      GLint blueBits,
 472                      GLint alphaBits,
 473                      GLint indexBits,
 474                      GLint depthBits,
 475                      GLint stencilBits,
 476                      GLint accumRedBits,
 477                      GLint accumGreenBits,
 478                      GLint accumBlueBits,
 479                      GLint accumAlphaBits,
 480                      GLint numSamples )
 481 {
 482    GLvisual *vis = (GLvisual *) _mesa_calloc(sizeof(GLvisual));
 483    if (vis) {
 484       if (!_mesa_initialize_visual(vis, rgbFlag, dbFlag, stereoFlag,
 485                                    redBits, greenBits, blueBits, alphaBits,
 486                                    indexBits, depthBits, stencilBits,
 487                                    accumRedBits, accumGreenBits,
 488                                    accumBlueBits, accumAlphaBits,
 489                                    numSamples)) {
 490          _mesa_free(vis);
 491          return NULL;
 492       }
 493    }
 494    return vis;
 495 }
 496
 497 /**
 498  * Makes some sanity checks and fills in the fields of the
 499  * GLvisual object with the given parameters.  If the caller needs
 500  * to set additional fields, he should just probably init the whole GLvisual
 501  * object himself.
 502  * \return GL_TRUE on success, or GL_FALSE on failure.
 503  *
 504  * \sa _mesa_create_visual() above for the parameter description.
 505  */
 506 GLboolean
 507 _mesa_initialize_visual( GLvisual *vis,
 508                          GLboolean rgbFlag,
 509                          GLboolean dbFlag,
 510                          GLboolean stereoFlag,
 511                          GLint redBits,
 512                          GLint greenBits,
 513                          GLint blueBits,
 514                          GLint alphaBits,
 515                          GLint indexBits,
 516                          GLint depthBits,
 517                          GLint stencilBits,
 518                          GLint accumRedBits,
 519                          GLint accumGreenBits,
 520                          GLint accumBlueBits,
 521                          GLint accumAlphaBits,
 522                          GLint numSamples )
 523 {
 524    assert(vis);
 525
 526    if (depthBits < 0 || depthBits > 32) {
 527       return GL_FALSE;
 528    }
 529    if (stencilBits < 0 || stencilBits > STENCIL_BITS) {
 530       return GL_FALSE;
 531    }
 532    assert(accumRedBits >= 0);
 533    assert(accumGreenBits >= 0);
 534    assert(accumBlueBits >= 0);
 535    assert(accumAlphaBits >= 0);
 536
 537    vis->rgbMode          = rgbFlag;
 538    vis->doubleBufferMode = dbFlag;
 539    vis->stereoMode       = stereoFlag;
 540
 541    vis->redBits          = redBits;
 542    vis->greenBits        = greenBits;
 543    vis->blueBits         = blueBits;
 544    vis->alphaBits        = alphaBits;
 545    vis->rgbBits          = redBits + greenBits + blueBits;
 546
 547    vis->indexBits      = indexBits;
 548    vis->depthBits      = depthBits;
 549    vis->stencilBits    = stencilBits;
 550
 551    vis->accumRedBits   = accumRedBits;
 552    vis->accumGreenBits = accumGreenBits;
 553    vis->accumBlueBits  = accumBlueBits;
 554    vis->accumAlphaBits = accumAlphaBits;
 555
 556    vis->haveAccumBuffer   = accumRedBits > 0;
 557    vis->haveDepthBuffer   = depthBits > 0;
 558    vis->haveStencilBuffer = stencilBits > 0;
 559
 560    vis->numAuxBuffers = 0;
 561    vis->level = 0;
 562    vis->pixmapMode = 0;
 563    vis->sampleBuffers = numSamples > 0 ? 1 : 0;
 564    vis->samples = numSamples;
 565
 566    return GL_TRUE;
 567 }
 568
 569
 570 /**
 571  * Destroy a visual and free its memory.
 572  *
 573  * \param vis visual.
 574  *
 575  * Frees the visual structure.
 576  */
 577 void
 578 _mesa_destroy_visual( GLvisual *vis )
 579 {
 580    _mesa_free(vis);
 581 }
 582
 583 /*@}*/
 584
 585
 586 /**********************************************************************/
 587 /** \name Context allocation, initialization, destroying
 588  *
 589  * The purpose of the most initialization functions here is to provide the
 590  * default state values according to the OpenGL specification.
 591  */
 592 /**********************************************************************/
 593 /*@{*/
 594
 595 /**
 596  * One-time initialization mutex lock.
 597  *
 598  * \sa Used by one_time_init().
 599  */
 600 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
 601
 602 /**
 603  * Calls all the various one-time-init functions in Mesa.
 604  *
 605  * While holding a global mutex lock, calls several initialization functions,
 606  * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
 607  * defined.
 608  *
 609  * \sa _math_init().
 610  */
 611 static void
 612 one_time_init( GLcontext *ctx )
 613 {
 614    static GLboolean alreadyCalled = GL_FALSE;
 615    (void) ctx;
 616    _glthread_LOCK_MUTEX(OneTimeLock);
 617    if (!alreadyCalled) {
 618       GLuint i;
 619
 620       /* do some implementation tests */
 621       assert( sizeof(GLbyte) == 1 );
 622       assert( sizeof(GLubyte) == 1 );
 623       assert( sizeof(GLshort) == 2 );
 624       assert( sizeof(GLushort) == 2 );
 625       assert( sizeof(GLint) == 4 );
 626       assert( sizeof(GLuint) == 4 );
 627
 628 #if _HAVE_FULL_GL
 629       _math_init();
 630
 631       for (i = 0; i < 256; i++) {
 632          _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
 633       }
 634 #endif
 635
 636 #ifdef USE_SPARC_ASM
 637       _mesa_init_sparc_glapi_relocs();
 638 #endif
 639       if (_mesa_getenv("MESA_DEBUG")) {
 640          _glapi_noop_enable_warnings(GL_TRUE);
 641          _glapi_set_warning_func( (_glapi_warning_func) _mesa_warning );
 642       }
 643       else {
 644          _glapi_noop_enable_warnings(GL_FALSE);
 645       }
 646
 647 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
 648       _mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",
 649                   MESA_VERSION_STRING, __DATE__, __TIME__);
 650 #endif
 651
 652       alreadyCalled = GL_TRUE;
 653    }
 654    _glthread_UNLOCK_MUTEX(OneTimeLock);
 655 }
 656
 657
 658 /**
 659  * Allocate and initialize a shared context state structure.
 660  * Initializes the display list, texture objects and vertex programs hash
 661  * tables, allocates the texture objects. If it runs out of memory, frees
 662  * everything already allocated before returning NULL.
 663  *
 664  * \return pointer to a gl_shared_state structure on success, or NULL on
 665  * failure.
 666  */
 667 static GLboolean
 668 alloc_shared_state( GLcontext *ctx )
 669 {
 670    struct gl_shared_state *ss = CALLOC_STRUCT(gl_shared_state);
 671    if (!ss)
 672       return GL_FALSE;
 673
 674    ctx->Shared = ss;
 675
 676    _glthread_INIT_MUTEX(ss->Mutex);
 677
 678    ss->DisplayList = _mesa_NewHashTable();
 679    ss->TexObjects = _mesa_NewHashTable();
 680 #if FEATURE_NV_vertex_program || FEATURE_NV_fragment_program
 681    ss->Programs = _mesa_NewHashTable();
 682 #endif
 683
 684 #if FEATURE_ARB_vertex_program
 685    ss->DefaultVertexProgram = ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
 686    if (!ss->DefaultVertexProgram)
 687       goto cleanup;
 688 #endif
 689 #if FEATURE_ARB_fragment_program
 690    ss->DefaultFragmentProgram = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 691    if (!ss->DefaultFragmentProgram)
 692       goto cleanup;
 693 #endif
 694 #if FEATURE_ATI_fragment_shader
 695    ss->ATIShaders = _mesa_NewHashTable();
 696    ss->DefaultFragmentShader = _mesa_new_ati_fragment_shader(ctx, 0);
 697    if (!ss->DefaultFragmentShader)
 698       goto cleanup;
 699 #endif
 700
 701 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 702    ss->BufferObjects = _mesa_NewHashTable();
 703 #endif
 704
 705    ss->ArrayObjects = _mesa_NewHashTable();
 706
 707 #if FEATURE_ARB_shader_objects
 708    ss->GL2Objects = _mesa_NewHashTable ();
 709 #endif
 710
 711    ss->Default1D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_1D);
 712    if (!ss->Default1D)
 713       goto cleanup;
 714
 715    ss->Default2D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_2D);
 716    if (!ss->Default2D)
 717       goto cleanup;
 718
 719    ss->Default3D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_3D);
 720    if (!ss->Default3D)
 721       goto cleanup;
 722
 723    ss->DefaultCubeMap = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_CUBE_MAP_ARB);
 724    if (!ss->DefaultCubeMap)
 725       goto cleanup;
 726
 727    ss->DefaultRect = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_RECTANGLE_NV);
 728    if (!ss->DefaultRect)
 729       goto cleanup;
 730
 731    /* Effectively bind the default textures to all texture units */
 732    ss->Default1D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 733    ss->Default2D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 734    ss->Default3D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 735    ss->DefaultCubeMap->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 736    ss->DefaultRect->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 737
 738    _glthread_INIT_MUTEX(ss->TexMutex);
 739    ss->TextureStateStamp = 0;
 740
 741
 742 #if FEATURE_EXT_framebuffer_object
 743    ss->FrameBuffers = _mesa_NewHashTable();
 744    if (!ss->FrameBuffers)
 745       goto cleanup;
 746    ss->RenderBuffers = _mesa_NewHashTable();
 747    if (!ss->RenderBuffers)
 748       goto cleanup;
 749 #endif
 750
 751
 752    return GL_TRUE;
 753
 754  cleanup:
 755    /* Ran out of memory at some point.  Free everything and return NULL */
 756    if (ss->DisplayList)
 757       _mesa_DeleteHashTable(ss->DisplayList);
 758    if (ss->TexObjects)
 759       _mesa_DeleteHashTable(ss->TexObjects);
 760 #if FEATURE_NV_vertex_program
 761    if (ss->Programs)
 762       _mesa_DeleteHashTable(ss->Programs);
 763 #endif
 764 #if FEATURE_ARB_vertex_program
 765    if (ss->DefaultVertexProgram)
 766       ctx->Driver.DeleteProgram(ctx, ss->DefaultVertexProgram);
 767 #endif
 768 #if FEATURE_ARB_fragment_program
 769    if (ss->DefaultFragmentProgram)
 770       ctx->Driver.DeleteProgram(ctx, ss->DefaultFragmentProgram);
 771 #endif
 772 #if FEATURE_ATI_fragment_shader
 773    if (ss->DefaultFragmentShader)
 774       _mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
 775 #endif
 776 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 777    if (ss->BufferObjects)
 778       _mesa_DeleteHashTable(ss->BufferObjects);
 779 #endif
 780
 781    if (ss->ArrayObjects)
 782       _mesa_DeleteHashTable (ss->ArrayObjects);
 783
 784 #if FEATURE_ARB_shader_objects
 785    if (ss->GL2Objects)
 786       _mesa_DeleteHashTable (ss->GL2Objects);
 787 #endif
 788
 789 #if FEATURE_EXT_framebuffer_object
 790    if (ss->FrameBuffers)
 791       _mesa_DeleteHashTable(ss->FrameBuffers);
 792    if (ss->RenderBuffers)
 793       _mesa_DeleteHashTable(ss->RenderBuffers);
 794 #endif
 795
 796    if (ss->Default1D)
 797       (*ctx->Driver.DeleteTexture)(ctx, ss->Default1D);
 798    if (ss->Default2D)
 799       (*ctx->Driver.DeleteTexture)(ctx, ss->Default2D);
 800    if (ss->Default3D)
 801       (*ctx->Driver.DeleteTexture)(ctx, ss->Default3D);
 802    if (ss->DefaultCubeMap)
 803       (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultCubeMap);
 804    if (ss->DefaultRect)
 805       (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultRect);
 806    if (ss)
 807       _mesa_free(ss);
 808    return GL_FALSE;
 809 }
 810
 811
 812 /**
 813  * Callback for deleting a display list.  Called by _mesa_HashDeleteAll().
 814  */
 815 static void
 816 delete_displaylist_cb(GLuint id, void *data, void *userData)
 817 {
 818    struct mesa_display_list *list = (struct mesa_display_list *) data;
 819    GLcontext *ctx = (GLcontext *) userData;
 820    _mesa_delete_list(ctx, list);
 821 }
 822
 823 /**
 824  * Callback for deleting a texture object.  Called by _mesa_HashDeleteAll().
 825  */
 826 static void
 827 delete_texture_cb(GLuint id, void *data, void *userData)
 828 {
 829    struct gl_texture_object *texObj = (struct gl_texture_object *) data;
 830    GLcontext *ctx = (GLcontext *) userData;
 831    ctx->Driver.DeleteTexture(ctx, texObj);
 832 }
 833
 834 /**
 835  * Callback for deleting a program object.  Called by _mesa_HashDeleteAll().
 836  */
 837 static void
 838 delete_program_cb(GLuint id, void *data, void *userData)
 839 {
 840    struct gl_program *prog = (struct gl_program *) data;
 841    GLcontext *ctx = (GLcontext *) userData;
 842    ctx->Driver.DeleteProgram(ctx, prog);
 843 }
 844
 845 /**
 846  * Callback for deleting an ATI fragment shader object.
 847  * Called by _mesa_HashDeleteAll().
 848  */
 849 static void
 850 delete_fragshader_cb(GLuint id, void *data, void *userData)
 851 {
 852    struct ati_fragment_shader *shader = (struct ati_fragment_shader *) data;
 853    GLcontext *ctx = (GLcontext *) userData;
 854    _mesa_delete_ati_fragment_shader(ctx, shader);
 855 }
 856
 857 /**
 858  * Callback for deleting a buffer object.  Called by _mesa_HashDeleteAll().
 859  */
 860 static void
 861 delete_bufferobj_cb(GLuint id, void *data, void *userData)
 862 {
 863    struct gl_buffer_object *bufObj = (struct gl_buffer_object *) data;
 864    GLcontext *ctx = (GLcontext *) userData;
 865    ctx->Driver.DeleteBuffer(ctx, bufObj);
 866 }
 867
 868 /**
 869  * Callback for deleting an array object.  Called by _mesa_HashDeleteAll().
 870  */
 871 static void
 872 delete_arrayobj_cb(GLuint id, void *data, void *userData)
 873 {
 874    struct gl_array_object *arrayObj = (struct gl_array_object *) data;
 875    GLcontext *ctx = (GLcontext *) userData;
 876    _mesa_delete_array_object(ctx, arrayObj);
 877 }
 878
 879 /**
 880  * Callback for deleting an shader object.  Called by _mesa_HashDeleteAll().
 881  */
 882 static void
 883 delete_shaderobj_cb(GLuint id, void *data, void *userData)
 884 {
 885    /* XXX probably need to fix this */
 886    _mesa_free(data);
 887 }
 888
 889
 890 /**
 891  * Deallocate a shared state object and all children structures.
 892  *
 893  * \param ctx GL context.
 894  * \param ss shared state pointer.
 895  *
 896  * Frees the display lists, the texture objects (calling the driver texture
 897  * deletion callback to free its private data) and the vertex programs, as well
 898  * as their hash tables.
 899  *
 900  * \sa alloc_shared_state().
 901  */
 902 static void
 903 free_shared_state( GLcontext *ctx, struct gl_shared_state *ss )
 904 {
 905    /*
 906     * Free display lists
 907     */
 908    _mesa_HashDeleteAll(ss->DisplayList, delete_displaylist_cb, ctx);
 909    _mesa_DeleteHashTable(ss->DisplayList);
 910
 911    /*
 912     * Free texture objects
 913     */
 914    ASSERT(ctx->Driver.DeleteTexture);
 915    /* the default textures */
 916    ctx->Driver.DeleteTexture(ctx, ss->Default1D);
 917    ctx->Driver.DeleteTexture(ctx, ss->Default2D);
 918    ctx->Driver.DeleteTexture(ctx, ss->Default3D);
 919    ctx->Driver.DeleteTexture(ctx, ss->DefaultCubeMap);
 920    ctx->Driver.DeleteTexture(ctx, ss->DefaultRect);
 921    /* all other textures */
 922    _mesa_HashDeleteAll(ss->TexObjects, delete_texture_cb, ctx);
 923    _mesa_DeleteHashTable(ss->TexObjects);
 924
 925 #if defined(FEATURE_NV_vertex_program) || defined(FEATURE_NV_fragment_program)
 926    _mesa_HashDeleteAll(ss->Programs, delete_program_cb, ctx);
 927    _mesa_DeleteHashTable(ss->Programs);
 928 #endif
 929 #if FEATURE_ARB_vertex_program
 930    _mesa_delete_program(ctx, ss->DefaultVertexProgram);
 931 #endif
 932 #if FEATURE_ARB_fragment_program
 933    _mesa_delete_program(ctx, ss->DefaultFragmentProgram);
 934 #endif
 935
 936 #if FEATURE_ATI_fragment_shader
 937    _mesa_HashDeleteAll(ss->ATIShaders, delete_fragshader_cb, ctx);
 938    _mesa_DeleteHashTable(ss->ATIShaders);
 939    _mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
 940 #endif
 941
 942 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 943    _mesa_HashDeleteAll(ss->BufferObjects, delete_bufferobj_cb, ctx);
 944    _mesa_DeleteHashTable(ss->BufferObjects);
 945 #endif
 946
 947    _mesa_HashDeleteAll(ss->ArrayObjects, delete_arrayobj_cb, ctx);
 948    _mesa_DeleteHashTable(ss->ArrayObjects);
 949
 950 #if FEATURE_ARB_shader_objects
 951    _mesa_HashDeleteAll(ss->GL2Objects, delete_shaderobj_cb, ctx);
 952    _mesa_DeleteHashTable(ss->GL2Objects);
 953 #endif
 954
 955 #if FEATURE_EXT_framebuffer_object
 956    _mesa_DeleteHashTable(ss->FrameBuffers);
 957    _mesa_DeleteHashTable(ss->RenderBuffers);
 958 #endif
 959
 960    _glthread_DESTROY_MUTEX(ss->Mutex);
 961
 962    _mesa_free(ss);
 963 }
 964
 965
 966 /**
 967  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 968  */
 969 static void
 970 _mesa_init_current( GLcontext *ctx )
 971 {
 972    GLuint i;
 973
 974    /* Init all to (0,0,0,1) */
 975    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 976       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 977    }
 978
 979    /* redo special cases: */
 980    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 1.0 );
 981    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 982    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 983    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 984    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_FOG], 0.0, 0.0, 0.0, 0.0 );
 985    ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX][0] = 1.0;
 986    ctx->Current.EdgeFlag = GL_TRUE;
 987 }
 988
 989
 990 /**
 991  * Init vertex/fragment program native limits from logical limits.
 992  */
 993 static void
 994 init_natives(struct gl_program_constants *prog)
 995 {
 996    prog->MaxNativeInstructions = prog->MaxInstructions;
 997    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 998    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 999    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
1000    prog->MaxNativeAttribs = prog->MaxAttribs;
1001    prog->MaxNativeTemps = prog->MaxTemps;
1002    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
1003    prog->MaxNativeParameters = prog->MaxParameters;
1004 }
1005
1006
1007 /**
1008  * Initialize fields of gl_constants (aka ctx->Const.*).
1009  * Use defaults from config.h.  The device drivers will often override
1010  * some of these values (such as number of texture units).
1011  */
1012 static void
1013 _mesa_init_constants( GLcontext *ctx )
1014 {
1015    assert(ctx);
1016
1017    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
1018    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
1019
1020    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_COORD_UNITS);
1021    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_IMAGE_UNITS);
1022
1023    /* Constants, may be overriden (usually only reduced) by device drivers */
1024    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
1025    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
1026    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
1027    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
1028    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
1029    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
1030    ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
1031                                      ctx->Const.MaxTextureImageUnits);
1032    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
1033    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
1034    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
1035    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
1036    ctx->Const.MinPointSize = MIN_POINT_SIZE;
1037    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
1038    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
1039    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
1040    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
1041    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
1042    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
1043    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
1044    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
1045    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
1046    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
1047    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
1048    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
1049    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
1050    ctx->Const.MaxLights = MAX_LIGHTS;
1051    ctx->Const.MaxShininess = 128.0;
1052    ctx->Const.MaxSpotExponent = 128.0;
1053    ctx->Const.MaxViewportWidth = MAX_WIDTH;
1054    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
1055 #if FEATURE_ARB_vertex_program
1056    ctx->Const.VertexProgram.MaxInstructions = MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS;
1057    ctx->Const.VertexProgram.MaxAluInstructions = 0;
1058    ctx->Const.VertexProgram.MaxTexInstructions = 0;
1059    ctx->Const.VertexProgram.MaxTexIndirections = 0;
1060    ctx->Const.VertexProgram.MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
1061    ctx->Const.VertexProgram.MaxTemps = MAX_NV_VERTEX_PROGRAM_TEMPS;
1062    ctx->Const.VertexProgram.MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;
1063    ctx->Const.VertexProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
1064    ctx->Const.VertexProgram.MaxEnvParams = MAX_NV_VERTEX_PROGRAM_PARAMS;
1065    ctx->Const.VertexProgram.MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
1066    ctx->Const.VertexProgram.MaxUniformComponents = MAX_VERTEX_UNIFORM_COMPONENTS;
1067    init_natives(&ctx->Const.VertexProgram);
1068 #endif
1069 #if FEATURE_ARB_fragment_program
1070    ctx->Const.FragmentProgram.MaxInstructions = MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS;
1071    ctx->Const.FragmentProgram.MaxAluInstructions = MAX_FRAGMENT_PROGRAM_ALU_INSTRUCTIONS;
1072    ctx->Const.FragmentProgram.MaxTexInstructions = MAX_FRAGMENT_PROGRAM_TEX_INSTRUCTIONS;
1073    ctx->Const.FragmentProgram.MaxTexIndirections = MAX_FRAGMENT_PROGRAM_TEX_INDIRECTIONS;
1074    ctx->Const.FragmentProgram.MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
1075    ctx->Const.FragmentProgram.MaxTemps = MAX_NV_FRAGMENT_PROGRAM_TEMPS;
1076    ctx->Const.FragmentProgram.MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1077    ctx->Const.FragmentProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
1078    ctx->Const.FragmentProgram.MaxEnvParams = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1079    ctx->Const.FragmentProgram.MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
1080    ctx->Const.FragmentProgram.MaxUniformComponents = MAX_FRAGMENT_UNIFORM_COMPONENTS;
1081    init_natives(&ctx->Const.FragmentProgram);
1082 #endif
1083    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
1084    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
1085
1086    /* If we're running in the X server, do bounds checking to prevent
1087     * segfaults and server crashes!
1088     */
1089 #if defined(XFree86Server)
1090    ctx->Const.CheckArrayBounds = GL_TRUE;
1091 #else
1092    ctx->Const.CheckArrayBounds = GL_FALSE;
1093 #endif
1094
1095    /* GL_ARB_draw_buffers */
1096    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
1097
1098    /* GL_OES_read_format */
1099    ctx->Const.ColorReadFormat = GL_RGBA;
1100    ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
1101
1102 #if FEATURE_EXT_framebuffer_object
1103    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
1104    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
1105 #endif
1106
1107 #if FEATURE_ARB_vertex_shader
1108    ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
1109    ctx->Const.MaxVaryingFloats = MAX_VARYING_FLOATS;
1110 #endif
1111
1112    /* sanity checks */
1113    ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
1114                                              ctx->Const.MaxTextureCoordUnits));
1115    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
1116    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
1117 }
1118
1119
1120 /**
1121  * Do some sanity checks on the limits/constants for the given context.
1122  * Only called the first time a context is bound.
1123  */
1124 static void
1125 check_context_limits(GLcontext *ctx)
1126 {
1127    /* Many context limits/constants are limited by the size of
1128     * internal arrays.
1129     */
1130    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
1131    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
1132    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
1133    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
1134
1135    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
1136    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
1137
1138    /* make sure largest texture image is <= MAX_WIDTH in size */
1139    assert((1 << (ctx->Const.MaxTextureLevels -1 )) <= MAX_WIDTH);
1140    assert((1 << (ctx->Const.MaxCubeTextureLevels -1 )) <= MAX_WIDTH);
1141    assert((1 << (ctx->Const.Max3DTextureLevels -1 )) <= MAX_WIDTH);
1142
1143    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
1144
1145    /* XXX probably add more tests */
1146 }
1147
1148
1149 /**
1150  * Initialize the attribute groups in a GL context.
1151  *
1152  * \param ctx GL context.
1153  *
1154  * Initializes all the attributes, calling the respective <tt>init*</tt>
1155  * functions for the more complex data structures.
1156  */
1157 static GLboolean
1158 init_attrib_groups( GLcontext *ctx )
1159 {
1160    assert(ctx);
1161
1162    /* Constants */
1163    _mesa_init_constants( ctx );
1164
1165    /* Extensions */
1166    _mesa_init_extensions( ctx );
1167
1168    /* Attribute Groups */
1169    _mesa_init_accum( ctx );
1170    _mesa_init_attrib( ctx );
1171    _mesa_init_buffer_objects( ctx );
1172    _mesa_init_color( ctx );
1173    _mesa_init_colortables( ctx );
1174    _mesa_init_current( ctx );
1175    _mesa_init_depth( ctx );
1176    _mesa_init_debug( ctx );
1177    _mesa_init_display_list( ctx );
1178    _mesa_init_eval( ctx );
1179    _mesa_init_feedback( ctx );
1180    _mesa_init_fog( ctx );
1181    _mesa_init_histogram( ctx );
1182    _mesa_init_hint( ctx );
1183    _mesa_init_line( ctx );
1184    _mesa_init_lighting( ctx );
1185    _mesa_init_matrix( ctx );
1186    _mesa_init_multisample( ctx );
1187    _mesa_init_pixel( ctx );
1188    _mesa_init_point( ctx );
1189    _mesa_init_polygon( ctx );
1190    _mesa_init_program( ctx );
1191    _mesa_init_query( ctx );
1192    _mesa_init_rastpos( ctx );
1193    _mesa_init_scissor( ctx );
1194    _mesa_init_shaderobjects (ctx);
1195    _mesa_init_stencil( ctx );
1196    _mesa_init_transform( ctx );
1197    _mesa_init_varray( ctx );
1198    _mesa_init_viewport( ctx );
1199
1200    if (!_mesa_init_texture( ctx ))
1201       return GL_FALSE;
1202
1203    _mesa_init_texture_s3tc( ctx );
1204    _mesa_init_texture_fxt1( ctx );
1205
1206    /* Miscellaneous */
1207    ctx->NewState = _NEW_ALL;
1208    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
1209    ctx->_Facing = 0;
1210
1211    return GL_TRUE;
1212 }
1213
1214
1215 /**
1216  * This is the default function we plug into all dispatch table slots
1217  * This helps prevents a segfault when someone calls a GL function without
1218  * first checking if the extension's supported.
1219  */
1220 static int
1221 generic_nop(void)
1222 {
1223    _mesa_problem(NULL, "User called no-op dispatch function (an unsupported extension function?)");
1224    return 0;
1225 }
1226
1227
1228 /**
1229  * Allocate and initialize a new dispatch table.
1230  */
1231 static struct _glapi_table *
1232 alloc_dispatch_table(void)
1233 {
1234    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1235     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
1236     * Mesa we do this to accomodate different versions of libGL and various
1237     * DRI drivers.
1238     */
1239    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
1240                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
1241    struct _glapi_table *table =
1242       (struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
1243    if (table) {
1244       _glapi_proc *entry = (_glapi_proc *) table;
1245       GLint i;
1246       for (i = 0; i < numEntries; i++) {
1247          entry[i] = (_glapi_proc) generic_nop;
1248       }
1249    }
1250    return table;
1251 }
1252
1253
1254 /**
1255  * Initialize a GLcontext struct (rendering context).
1256  *
1257  * This includes allocating all the other structs and arrays which hang off of
1258  * the context by pointers.
1259  * Note that the driver needs to pass in its dd_function_table here since
1260  * we need to at least call driverFunctions->NewTextureObject to create the
1261  * default texture objects.
1262  *
1263  * Called by _mesa_create_context().
1264  *
1265  * Performs the imports and exports callback tables initialization, and
1266  * miscellaneous one-time initializations. If no shared context is supplied one
1267  * is allocated, and increase its reference count.  Setups the GL API dispatch
1268  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1269  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1270  * for debug flags.
1271  *
1272  * \param ctx the context to initialize
1273  * \param visual describes the visual attributes for this context
1274  * \param share_list points to context to share textures, display lists,
1275  *        etc with, or NULL
1276  * \param driverFunctions table of device driver functions for this context
1277  *        to use
1278  * \param driverContext pointer to driver-specific context data
1279  */
1280 GLboolean
1281 _mesa_initialize_context( GLcontext *ctx,
1282                           const GLvisual *visual,
1283                           GLcontext *share_list,
1284                           const struct dd_function_table *driverFunctions,
1285                           void *driverContext )
1286 {
1287    ASSERT(driverContext);
1288    assert(driverFunctions->NewTextureObject);
1289    assert(driverFunctions->FreeTexImageData);
1290
1291    /* If the driver wants core Mesa to use special imports, it'll have to
1292     * override these defaults.
1293     */
1294    _mesa_init_default_imports( &(ctx->imports), driverContext );
1295
1296    /* initialize the exports (Mesa functions called by the window system) */
1297    _mesa_init_default_exports( &(ctx->exports) );
1298
1299    /* misc one-time initializations */
1300    one_time_init(ctx);
1301
1302    ctx->Visual = *visual;
1303    ctx->DrawBuffer = NULL;
1304    ctx->ReadBuffer = NULL;
1305    ctx->WinSysDrawBuffer = NULL;
1306    ctx->WinSysReadBuffer = NULL;
1307
1308    /* Plug in driver functions and context pointer here.
1309     * This is important because when we call alloc_shared_state() below
1310     * we'll call ctx->Driver.NewTextureObject() to create the default
1311     * textures.
1312     */
1313    ctx->Driver = *driverFunctions;
1314    ctx->DriverCtx = driverContext;
1315
1316    if (share_list) {
1317       /* share state with another context */
1318       ctx->Shared = share_list->Shared;
1319    }
1320    else {
1321       /* allocate new, unshared state */
1322       if (!alloc_shared_state( ctx )) {
1323          return GL_FALSE;
1324       }
1325    }
1326    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1327    ctx->Shared->RefCount++;
1328    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1329
1330    if (!init_attrib_groups( ctx )) {
1331       free_shared_state(ctx, ctx->Shared);
1332       return GL_FALSE;
1333    }
1334
1335    /* setup the API dispatch tables */
1336    ctx->Exec = alloc_dispatch_table();
1337    ctx->Save = alloc_dispatch_table();
1338    if (!ctx->Exec || !ctx->Save) {
1339       free_shared_state(ctx, ctx->Shared);
1340       if (ctx->Exec)
1341          _mesa_free(ctx->Exec);
1342    }
1343    _mesa_init_exec_table(ctx->Exec);
1344    ctx->CurrentDispatch = ctx->Exec;
1345 #if _HAVE_FULL_GL
1346    _mesa_init_dlist_table(ctx->Save);
1347    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
1348    /* Neutral tnl module stuff */
1349    _mesa_init_exec_vtxfmt( ctx );
1350    ctx->TnlModule.Current = NULL;
1351    ctx->TnlModule.SwapCount = 0;
1352 #endif
1353
1354    ctx->_MaintainTexEnvProgram = (_mesa_getenv("MESA_TEX_PROG") != NULL);
1355    ctx->_UseTexEnvProgram = ctx->_MaintainTexEnvProgram;
1356
1357    ctx->_MaintainTnlProgram = (_mesa_getenv("MESA_TNL_PROG") != NULL);
1358    if (ctx->_MaintainTnlProgram)
1359       ctx->_MaintainTexEnvProgram = 1; /* this is required... */
1360
1361    ctx->FirstTimeCurrent = GL_TRUE;
1362
1363    return GL_TRUE;
1364 }
1365
1366
1367 /**
1368  * Allocate and initialize a GLcontext structure.
1369  * Note that the driver needs to pass in its dd_function_table here since
1370  * we need to at least call driverFunctions->NewTextureObject to initialize
1371  * the rendering context.
1372  *
1373  * \param visual a GLvisual pointer (we copy the struct contents)
1374  * \param share_list another context to share display lists with or NULL
1375  * \param driverFunctions points to the dd_function_table into which the
1376  *        driver has plugged in all its special functions.
1377  * \param driverCtx points to the device driver's private context state
1378  *
1379  * \return pointer to a new __GLcontextRec or NULL if error.
1380  */
1381 GLcontext *
1382 _mesa_create_context( const GLvisual *visual,
1383                       GLcontext *share_list,
1384                       const struct dd_function_table *driverFunctions,
1385                       void *driverContext )
1386
1387 {
1388    GLcontext *ctx;
1389
1390    ASSERT(visual);
1391    ASSERT(driverContext);
1392
1393    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
1394    if (!ctx)
1395       return NULL;
1396
1397    if (_mesa_initialize_context(ctx, visual, share_list,
1398                                 driverFunctions, driverContext)) {
1399       return ctx;
1400    }
1401    else {
1402       _mesa_free(ctx);
1403       return NULL;
1404    }
1405 }
1406
1407
1408 /**
1409  * Free the data associated with the given context.
1410  *
1411  * But doesn't free the GLcontext struct itself.
1412  *
1413  * \sa _mesa_initialize_context() and init_attrib_groups().
1414  */
1415 void
1416 _mesa_free_context_data( GLcontext *ctx )
1417 {
1418    /* if we're destroying the current context, unbind it first */
1419    if (ctx == _mesa_get_current_context()) {
1420       _mesa_make_current(NULL, NULL, NULL);
1421    }
1422
1423    _mesa_free_lighting_data( ctx );
1424    _mesa_free_eval_data( ctx );
1425    _mesa_free_texture_data( ctx );
1426    _mesa_free_matrix_data( ctx );
1427    _mesa_free_viewport_data( ctx );
1428    _mesa_free_colortables_data( ctx );
1429    _mesa_free_program_data(ctx);
1430    _mesa_free_query_data(ctx);
1431
1432 #if FEATURE_ARB_vertex_buffer_object
1433    _mesa_delete_buffer_object(ctx, ctx->Array.NullBufferObj);
1434 #endif
1435    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
1436
1437    /* free dispatch tables */
1438    _mesa_free(ctx->Exec);
1439    _mesa_free(ctx->Save);
1440
1441    /* Shared context state (display lists, textures, etc) */
1442    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1443    ctx->Shared->RefCount--;
1444    assert(ctx->Shared->RefCount >= 0);
1445    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1446    if (ctx->Shared->RefCount == 0) {
1447       /* free shared state */
1448       free_shared_state( ctx, ctx->Shared );
1449    }
1450
1451    if (ctx->Extensions.String)
1452       _mesa_free((void *) ctx->Extensions.String);
1453 }
1454
1455
1456 /**
1457  * Destroy a GLcontext structure.
1458  *
1459  * \param ctx GL context.
1460  *
1461  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1462  */
1463 void
1464 _mesa_destroy_context( GLcontext *ctx )
1465 {
1466    if (ctx) {
1467       _mesa_free_context_data(ctx);
1468       _mesa_free( (void *) ctx );
1469    }
1470 }
1471
1472
1473 #if _HAVE_FULL_GL
1474 /**
1475  * Copy attribute groups from one context to another.
1476  *
1477  * \param src source context
1478  * \param dst destination context
1479  * \param mask bitwise OR of GL_*_BIT flags
1480  *
1481  * According to the bits specified in \p mask, copies the corresponding
1482  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1483  * memcpy is not enough due to the existence of internal pointers in their data
1484  * structures.
1485  */
1486 void
1487 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1488 {
1489    if (mask & GL_ACCUM_BUFFER_BIT) {
1490       /* OK to memcpy */
1491       dst->Accum = src->Accum;
1492    }
1493    if (mask & GL_COLOR_BUFFER_BIT) {
1494       /* OK to memcpy */
1495       dst->Color = src->Color;
1496    }
1497    if (mask & GL_CURRENT_BIT) {
1498       /* OK to memcpy */
1499       dst->Current = src->Current;
1500    }
1501    if (mask & GL_DEPTH_BUFFER_BIT) {
1502       /* OK to memcpy */
1503       dst->Depth = src->Depth;
1504    }
1505    if (mask & GL_ENABLE_BIT) {
1506       /* no op */
1507    }
1508    if (mask & GL_EVAL_BIT) {
1509       /* OK to memcpy */
1510       dst->Eval = src->Eval;
1511    }
1512    if (mask & GL_FOG_BIT) {
1513       /* OK to memcpy */
1514       dst->Fog = src->Fog;
1515    }
1516    if (mask & GL_HINT_BIT) {
1517       /* OK to memcpy */
1518       dst->Hint = src->Hint;
1519    }
1520    if (mask & GL_LIGHTING_BIT) {
1521       GLuint i;
1522       /* begin with memcpy */
1523       dst->Light = src->Light;
1524       /* fixup linked lists to prevent pointer insanity */
1525       make_empty_list( &(dst->Light.EnabledList) );
1526       for (i = 0; i < MAX_LIGHTS; i++) {
1527          if (dst->Light.Light[i].Enabled) {
1528             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1529          }
1530       }
1531    }
1532    if (mask & GL_LINE_BIT) {
1533       /* OK to memcpy */
1534       dst->Line = src->Line;
1535    }
1536    if (mask & GL_LIST_BIT) {
1537       /* OK to memcpy */
1538       dst->List = src->List;
1539    }
1540    if (mask & GL_PIXEL_MODE_BIT) {
1541       /* OK to memcpy */
1542       dst->Pixel = src->Pixel;
1543    }
1544    if (mask & GL_POINT_BIT) {
1545       /* OK to memcpy */
1546       dst->Point = src->Point;
1547    }
1548    if (mask & GL_POLYGON_BIT) {
1549       /* OK to memcpy */
1550       dst->Polygon = src->Polygon;
1551    }
1552    if (mask & GL_POLYGON_STIPPLE_BIT) {
1553       /* Use loop instead of MEMCPY due to problem with Portland Group's
1554        * C compiler.  Reported by John Stone.
1555        */
1556       GLuint i;
1557       for (i = 0; i < 32; i++) {
1558          dst->PolygonStipple[i] = src->PolygonStipple[i];
1559       }
1560    }
1561    if (mask & GL_SCISSOR_BIT) {
1562       /* OK to memcpy */
1563       dst->Scissor = src->Scissor;
1564    }
1565    if (mask & GL_STENCIL_BUFFER_BIT) {
1566       /* OK to memcpy */
1567       dst->Stencil = src->Stencil;
1568    }
1569    if (mask & GL_TEXTURE_BIT) {
1570       /* Cannot memcpy because of pointers */
1571       _mesa_copy_texture_state(src, dst);
1572    }
1573    if (mask & GL_TRANSFORM_BIT) {
1574       /* OK to memcpy */
1575       dst->Transform = src->Transform;
1576    }
1577    if (mask & GL_VIEWPORT_BIT) {
1578       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1579       dst->Viewport.X = src->Viewport.X;
1580       dst->Viewport.Y = src->Viewport.Y;
1581       dst->Viewport.Width = src->Viewport.Width;
1582       dst->Viewport.Height = src->Viewport.Height;
1583       dst->Viewport.Near = src->Viewport.Near;
1584       dst->Viewport.Far = src->Viewport.Far;
1585       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1586    }
1587
1588    /* XXX FIXME:  Call callbacks?
1589     */
1590    dst->NewState = _NEW_ALL;
1591 }
1592 #endif
1593
1594
1595 /**
1596  * Check if the given context can render into the given framebuffer
1597  * by checking visual attributes.
1598  *
1599  * XXX this may go away someday because we're moving toward more freedom
1600  * in binding contexts to drawables with different visual attributes.
1601  * The GL_EXT_f_b_o extension is prompting some of that.
1602  *
1603  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1604  */
1605 static GLboolean
1606 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1607 {
1608    const GLvisual *ctxvis = &ctx->Visual;
1609    const GLvisual *bufvis = &buffer->Visual;
1610
1611    if (ctxvis == bufvis)
1612       return GL_TRUE;
1613
1614    if (ctxvis->rgbMode != bufvis->rgbMode)
1615       return GL_FALSE;
1616 #if 0
1617    /* disabling this fixes the fgl_glxgears pbuffer demo */
1618    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1619       return GL_FALSE;
1620 #endif
1621    if (ctxvis->stereoMode && !bufvis->stereoMode)
1622       return GL_FALSE;
1623    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1624       return GL_FALSE;
1625    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1626       return GL_FALSE;
1627    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1628       return GL_FALSE;
1629    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1630       return GL_FALSE;
1631    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1632       return GL_FALSE;
1633    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1634       return GL_FALSE;
1635    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1636       return GL_FALSE;
1637    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1638       return GL_FALSE;
1639
1640    return GL_TRUE;
1641 }
1642
1643
1644 /**
1645  * Do one-time initialization for the given framebuffer.  Specifically,
1646  * ask the driver for the window's current size and update the framebuffer
1647  * object to match.
1648  * Really, the device driver should totally take care of this.
1649  */
1650 static void
1651 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1652 {
1653    GLuint width, height;
1654    if (ctx->Driver.GetBufferSize) {
1655       ctx->Driver.GetBufferSize(fb, &width, &height);
1656       if (ctx->Driver.ResizeBuffers)
1657          ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1658       fb->Initialized = GL_TRUE;
1659    }
1660 }
1661
1662
1663 /**
1664  * Bind the given context to the given drawBuffer and readBuffer and
1665  * make it the current context for the calling thread.
1666  * We'll render into the drawBuffer and read pixels from the
1667  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1668  *
1669  * We check that the context's and framebuffer's visuals are compatible
1670  * and return immediately if they're not.
1671  *
1672  * \param newCtx  the new GL context. If NULL then there will be no current GL
1673  *                context.
1674  * \param drawBuffer  the drawing framebuffer
1675  * \param readBuffer  the reading framebuffer
1676  */
1677 void
1678 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1679                     GLframebuffer *readBuffer )
1680 {
1681    if (MESA_VERBOSE & VERBOSE_API)
1682       _mesa_debug(newCtx, "_mesa_make_current()\n");
1683
1684    /* Check that the context's and framebuffer's visuals are compatible.
1685     */
1686    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1687       if (!check_compatible(newCtx, drawBuffer)) {
1688          _mesa_warning(newCtx,
1689               "MakeCurrent: incompatible visuals for context and drawbuffer");
1690          return;
1691       }
1692    }
1693    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1694       if (!check_compatible(newCtx, readBuffer)) {
1695          _mesa_warning(newCtx,
1696               "MakeCurrent: incompatible visuals for context and readbuffer");
1697          return;
1698       }
1699    }
1700
1701    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1702    _glapi_set_context((void *) newCtx);
1703    ASSERT(_mesa_get_current_context() == newCtx);
1704
1705    if (!newCtx) {
1706       _glapi_set_dispatch(NULL);  /* none current */
1707    }
1708    else {
1709       _glapi_set_dispatch(newCtx->CurrentDispatch);
1710
1711       if (drawBuffer && readBuffer) {
1712          /* TODO: check if newCtx and buffer's visual match??? */
1713
1714          ASSERT(drawBuffer->Name == 0);
1715          ASSERT(readBuffer->Name == 0);
1716          newCtx->WinSysDrawBuffer = drawBuffer;
1717          newCtx->WinSysReadBuffer = readBuffer;
1718
1719          /*
1720           * Only set the context's Draw/ReadBuffer fields if they're NULL
1721           * or not bound to a user-created FBO.
1722           */
1723          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1724             newCtx->DrawBuffer = drawBuffer;
1725          }
1726          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1727             newCtx->ReadBuffer = readBuffer;
1728          }
1729
1730          newCtx->NewState |= _NEW_BUFFERS;
1731
1732 #if 1
1733          /* We want to get rid of these lines: */
1734
1735 #if _HAVE_FULL_GL
1736          if (!drawBuffer->Initialized) {
1737             initialize_framebuffer_size(newCtx, drawBuffer);
1738          }
1739          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1740             initialize_framebuffer_size(newCtx, readBuffer);
1741          }
1742
1743          _mesa_resizebuffers(newCtx);
1744 #endif
1745
1746 #else
1747          /* We want the drawBuffer and readBuffer to be initialized by
1748           * the driver.
1749           * This generally means the Width and Height match the actual
1750           * window size and the renderbuffers (both hardware and software
1751           * based) are allocated to match.  The later can generally be
1752           * done with a call to _mesa_resize_framebuffer().
1753           *
1754           * It's theoretically possible for a buffer to have zero width
1755           * or height, but for now, assert check that the driver did what's
1756           * expected of it.
1757           */
1758          ASSERT(drawBuffer->Width > 0);
1759          ASSERT(drawBuffer->Height > 0);
1760 #endif
1761
1762          if (newCtx->FirstTimeCurrent) {
1763             /* set initial viewport and scissor size now */
1764             _mesa_set_viewport(newCtx, 0, 0,
1765                                drawBuffer->Width, drawBuffer->Height);
1766             _mesa_set_scissor(newCtx, 0, 0,
1767                               drawBuffer->Width, drawBuffer->Height );
1768             check_context_limits(newCtx);
1769          }
1770       }
1771
1772       /* We can use this to help debug user's problems.  Tell them to set
1773        * the MESA_INFO env variable before running their app.  Then the
1774        * first time each context is made current we'll print some useful
1775        * information.
1776        */
1777       if (newCtx->FirstTimeCurrent) {
1778          if (_mesa_getenv("MESA_INFO")) {
1779             _mesa_print_info();
1780          }
1781          newCtx->FirstTimeCurrent = GL_FALSE;
1782       }
1783    }
1784 }
1785
1786
1787 /**
1788  * Make context 'ctx' share the display lists, textures and programs
1789  * that are associated with 'ctxToShare'.
1790  * Any display lists, textures or programs associated with 'ctx' will
1791  * be deleted if nobody else is sharing them.
1792  */
1793 GLboolean
1794 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1795 {
1796    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1797       ctx->Shared->RefCount--;
1798       if (ctx->Shared->RefCount == 0) {
1799          free_shared_state(ctx, ctx->Shared);
1800       }
1801       ctx->Shared = ctxToShare->Shared;
1802       ctx->Shared->RefCount++;
1803       return GL_TRUE;
1804    }
1805    else {
1806       return GL_FALSE;
1807    }
1808 }
1809
1810
1811
1812 /**
1813  * Get current context for the calling thread.
1814  *
1815  * \return pointer to the current GL context.
1816  *
1817  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1818  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in context.h.
1819  */
1820 GLcontext *
1821 _mesa_get_current_context( void )
1822 {
1823    return (GLcontext *) _glapi_get_context();
1824 }
1825
1826 /**
1827  * Get context's current API dispatch table.
1828  *
1829  * It'll either be the immediate-mode execute dispatcher or the display list
1830  * compile dispatcher.
1831  *
1832  * \param ctx GL context.
1833  *
1834  * \return pointer to dispatch_table.
1835  *
1836  * Simply returns __GLcontextRec::CurrentDispatch.
1837  */
1838 struct _glapi_table *
1839 _mesa_get_dispatch(GLcontext *ctx)
1840 {
1841    return ctx->CurrentDispatch;
1842 }
1843
1844 /*@}*/
1845
1846
1847 /**********************************************************************/
1848 /** \name Miscellaneous functions                                     */
1849 /**********************************************************************/
1850 /*@{*/
1851
1852 /**
1853  * Record an error.
1854  *
1855  * \param ctx GL context.
1856  * \param error error code.
1857  *
1858  * Records the given error code and call the driver's dd_function_table::Error
1859  * function if defined.
1860  *
1861  * \sa
1862  * This is called via _mesa_error().
1863  */
1864 void
1865 _mesa_record_error( GLcontext *ctx, GLenum error )
1866 {
1867    if (!ctx)
1868       return;
1869
1870    if (ctx->ErrorValue == GL_NO_ERROR) {
1871       ctx->ErrorValue = error;
1872    }
1873
1874    /* Call device driver's error handler, if any.  This is used on the Mac. */
1875    if (ctx->Driver.Error) {
1876       (*ctx->Driver.Error)( ctx );
1877    }
1878 }
1879
1880 /**
1881  * Execute glFinish().
1882  *
1883  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1884  * dd_function_table::Finish driver callback, if not NULL.
1885  */
1886 void GLAPIENTRY
1887 _mesa_Finish( void )
1888 {
1889    GET_CURRENT_CONTEXT(ctx);
1890    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1891    if (ctx->Driver.Finish) {
1892       (*ctx->Driver.Finish)( ctx );
1893    }
1894 }
1895
1896 /**
1897  * Execute glFlush().
1898  *
1899  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1900  * dd_function_table::Flush driver callback, if not NULL.
1901  */
1902 void GLAPIENTRY
1903 _mesa_Flush( void )
1904 {
1905    GET_CURRENT_CONTEXT(ctx);
1906    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1907    if (ctx->Driver.Flush) {
1908       (*ctx->Driver.Flush)( ctx );
1909    }
1910 }
1911
1912
1913 /*@}*/