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_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
 985    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
 986 }
 987
 988
 989 /**
 990  * Init vertex/fragment program native limits from logical limits.
 991  */
 992 static void
 993 init_natives(struct gl_program_constants *prog)
 994 {
 995    prog->MaxNativeInstructions = prog->MaxInstructions;
 996    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 997    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 998    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 999    prog->MaxNativeAttribs = prog->MaxAttribs;
1000    prog->MaxNativeTemps = prog->MaxTemps;
1001    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
1002    prog->MaxNativeParameters = prog->MaxParameters;
1003 }
1004
1005
1006 /**
1007  * Initialize fields of gl_constants (aka ctx->Const.*).
1008  * Use defaults from config.h.  The device drivers will often override
1009  * some of these values (such as number of texture units).
1010  */
1011 static void
1012 _mesa_init_constants( GLcontext *ctx )
1013 {
1014    assert(ctx);
1015
1016    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
1017    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
1018
1019    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_COORD_UNITS);
1020    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_IMAGE_UNITS);
1021
1022    /* Constants, may be overriden (usually only reduced) by device drivers */
1023    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
1024    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
1025    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
1026    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
1027    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
1028    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
1029    ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
1030                                      ctx->Const.MaxTextureImageUnits);
1031    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
1032    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
1033    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
1034    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
1035    ctx->Const.MinPointSize = MIN_POINT_SIZE;
1036    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
1037    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
1038    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
1039    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
1040    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
1041    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
1042    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
1043    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
1044    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
1045    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
1046    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
1047    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
1048    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
1049    ctx->Const.MaxLights = MAX_LIGHTS;
1050    ctx->Const.MaxShininess = 128.0;
1051    ctx->Const.MaxSpotExponent = 128.0;
1052    ctx->Const.MaxViewportWidth = MAX_WIDTH;
1053    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
1054 #if FEATURE_ARB_vertex_program
1055    ctx->Const.VertexProgram.MaxInstructions = MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS;
1056    ctx->Const.VertexProgram.MaxAluInstructions = 0;
1057    ctx->Const.VertexProgram.MaxTexInstructions = 0;
1058    ctx->Const.VertexProgram.MaxTexIndirections = 0;
1059    ctx->Const.VertexProgram.MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
1060    ctx->Const.VertexProgram.MaxTemps = MAX_NV_VERTEX_PROGRAM_TEMPS;
1061    ctx->Const.VertexProgram.MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;
1062    ctx->Const.VertexProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
1063    ctx->Const.VertexProgram.MaxEnvParams = MAX_NV_VERTEX_PROGRAM_PARAMS;
1064    ctx->Const.VertexProgram.MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
1065    ctx->Const.VertexProgram.MaxUniformComponents = MAX_VERTEX_UNIFORM_COMPONENTS;
1066    init_natives(&ctx->Const.VertexProgram);
1067 #endif
1068 #if FEATURE_ARB_fragment_program
1069    ctx->Const.FragmentProgram.MaxInstructions = MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS;
1070    ctx->Const.FragmentProgram.MaxAluInstructions = MAX_FRAGMENT_PROGRAM_ALU_INSTRUCTIONS;
1071    ctx->Const.FragmentProgram.MaxTexInstructions = MAX_FRAGMENT_PROGRAM_TEX_INSTRUCTIONS;
1072    ctx->Const.FragmentProgram.MaxTexIndirections = MAX_FRAGMENT_PROGRAM_TEX_INDIRECTIONS;
1073    ctx->Const.FragmentProgram.MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
1074    ctx->Const.FragmentProgram.MaxTemps = MAX_NV_FRAGMENT_PROGRAM_TEMPS;
1075    ctx->Const.FragmentProgram.MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1076    ctx->Const.FragmentProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
1077    ctx->Const.FragmentProgram.MaxEnvParams = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1078    ctx->Const.FragmentProgram.MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
1079    ctx->Const.FragmentProgram.MaxUniformComponents = MAX_FRAGMENT_UNIFORM_COMPONENTS;
1080    init_natives(&ctx->Const.FragmentProgram);
1081 #endif
1082    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
1083    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
1084
1085    /* If we're running in the X server, do bounds checking to prevent
1086     * segfaults and server crashes!
1087     */
1088 #if defined(XFree86Server)
1089    ctx->Const.CheckArrayBounds = GL_TRUE;
1090 #else
1091    ctx->Const.CheckArrayBounds = GL_FALSE;
1092 #endif
1093
1094    /* GL_ARB_draw_buffers */
1095    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
1096
1097    /* GL_OES_read_format */
1098    ctx->Const.ColorReadFormat = GL_RGBA;
1099    ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
1100
1101 #if FEATURE_EXT_framebuffer_object
1102    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
1103    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
1104 #endif
1105
1106 #if FEATURE_ARB_vertex_shader
1107    ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
1108    ctx->Const.MaxVaryingFloats = MAX_VARYING_FLOATS;
1109 #endif
1110
1111    /* sanity checks */
1112    ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
1113                                              ctx->Const.MaxTextureCoordUnits));
1114    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
1115    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
1116 }
1117
1118
1119 /**
1120  * Do some sanity checks on the limits/constants for the given context.
1121  * Only called the first time a context is bound.
1122  */
1123 static void
1124 check_context_limits(GLcontext *ctx)
1125 {
1126    /* Many context limits/constants are limited by the size of
1127     * internal arrays.
1128     */
1129    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
1130    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
1131    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
1132    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
1133
1134    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
1135    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
1136
1137    /* make sure largest texture image is <= MAX_WIDTH in size */
1138    assert((1 << (ctx->Const.MaxTextureLevels -1 )) <= MAX_WIDTH);
1139    assert((1 << (ctx->Const.MaxCubeTextureLevels -1 )) <= MAX_WIDTH);
1140    assert((1 << (ctx->Const.Max3DTextureLevels -1 )) <= MAX_WIDTH);
1141
1142    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
1143
1144    /* XXX probably add more tests */
1145 }
1146
1147
1148 /**
1149  * Initialize the attribute groups in a GL context.
1150  *
1151  * \param ctx GL context.
1152  *
1153  * Initializes all the attributes, calling the respective <tt>init*</tt>
1154  * functions for the more complex data structures.
1155  */
1156 static GLboolean
1157 init_attrib_groups( GLcontext *ctx )
1158 {
1159    assert(ctx);
1160
1161    /* Constants */
1162    _mesa_init_constants( ctx );
1163
1164    /* Extensions */
1165    _mesa_init_extensions( ctx );
1166
1167    /* Attribute Groups */
1168    _mesa_init_accum( ctx );
1169    _mesa_init_attrib( ctx );
1170    _mesa_init_buffer_objects( ctx );
1171    _mesa_init_color( ctx );
1172    _mesa_init_colortables( ctx );
1173    _mesa_init_current( ctx );
1174    _mesa_init_depth( ctx );
1175    _mesa_init_debug( ctx );
1176    _mesa_init_display_list( ctx );
1177    _mesa_init_eval( ctx );
1178    _mesa_init_feedback( ctx );
1179    _mesa_init_fog( ctx );
1180    _mesa_init_histogram( ctx );
1181    _mesa_init_hint( ctx );
1182    _mesa_init_line( ctx );
1183    _mesa_init_lighting( ctx );
1184    _mesa_init_matrix( ctx );
1185    _mesa_init_multisample( ctx );
1186    _mesa_init_pixel( ctx );
1187    _mesa_init_point( ctx );
1188    _mesa_init_polygon( ctx );
1189    _mesa_init_program( ctx );
1190    _mesa_init_query( ctx );
1191    _mesa_init_rastpos( ctx );
1192    _mesa_init_scissor( ctx );
1193    _mesa_init_shaderobjects (ctx);
1194    _mesa_init_stencil( ctx );
1195    _mesa_init_transform( ctx );
1196    _mesa_init_varray( ctx );
1197    _mesa_init_viewport( ctx );
1198
1199    if (!_mesa_init_texture( ctx ))
1200       return GL_FALSE;
1201
1202    _mesa_init_texture_s3tc( ctx );
1203    _mesa_init_texture_fxt1( ctx );
1204
1205    /* Miscellaneous */
1206    ctx->NewState = _NEW_ALL;
1207    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
1208    ctx->_Facing = 0;
1209
1210    return GL_TRUE;
1211 }
1212
1213
1214 /**
1215  * This is the default function we plug into all dispatch table slots
1216  * This helps prevents a segfault when someone calls a GL function without
1217  * first checking if the extension's supported.
1218  */
1219 static int
1220 generic_nop(void)
1221 {
1222    _mesa_problem(NULL, "User called no-op dispatch function (an unsupported extension function?)");
1223    return 0;
1224 }
1225
1226
1227 /**
1228  * Allocate and initialize a new dispatch table.
1229  */
1230 static struct _glapi_table *
1231 alloc_dispatch_table(void)
1232 {
1233    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1234     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
1235     * Mesa we do this to accomodate different versions of libGL and various
1236     * DRI drivers.
1237     */
1238    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
1239                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
1240    struct _glapi_table *table =
1241       (struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
1242    if (table) {
1243       _glapi_proc *entry = (_glapi_proc *) table;
1244       GLint i;
1245       for (i = 0; i < numEntries; i++) {
1246          entry[i] = (_glapi_proc) generic_nop;
1247       }
1248    }
1249    return table;
1250 }
1251
1252
1253 /**
1254  * Initialize a GLcontext struct (rendering context).
1255  *
1256  * This includes allocating all the other structs and arrays which hang off of
1257  * the context by pointers.
1258  * Note that the driver needs to pass in its dd_function_table here since
1259  * we need to at least call driverFunctions->NewTextureObject to create the
1260  * default texture objects.
1261  *
1262  * Called by _mesa_create_context().
1263  *
1264  * Performs the imports and exports callback tables initialization, and
1265  * miscellaneous one-time initializations. If no shared context is supplied one
1266  * is allocated, and increase its reference count.  Setups the GL API dispatch
1267  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1268  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1269  * for debug flags.
1270  *
1271  * \param ctx the context to initialize
1272  * \param visual describes the visual attributes for this context
1273  * \param share_list points to context to share textures, display lists,
1274  *        etc with, or NULL
1275  * \param driverFunctions table of device driver functions for this context
1276  *        to use
1277  * \param driverContext pointer to driver-specific context data
1278  */
1279 GLboolean
1280 _mesa_initialize_context( GLcontext *ctx,
1281                           const GLvisual *visual,
1282                           GLcontext *share_list,
1283                           const struct dd_function_table *driverFunctions,
1284                           void *driverContext )
1285 {
1286    ASSERT(driverContext);
1287    assert(driverFunctions->NewTextureObject);
1288    assert(driverFunctions->FreeTexImageData);
1289
1290    /* If the driver wants core Mesa to use special imports, it'll have to
1291     * override these defaults.
1292     */
1293    _mesa_init_default_imports( &(ctx->imports), driverContext );
1294
1295    /* initialize the exports (Mesa functions called by the window system) */
1296    _mesa_init_default_exports( &(ctx->exports) );
1297
1298    /* misc one-time initializations */
1299    one_time_init(ctx);
1300
1301    ctx->Visual = *visual;
1302    ctx->DrawBuffer = NULL;
1303    ctx->ReadBuffer = NULL;
1304    ctx->WinSysDrawBuffer = NULL;
1305    ctx->WinSysReadBuffer = NULL;
1306
1307    /* Plug in driver functions and context pointer here.
1308     * This is important because when we call alloc_shared_state() below
1309     * we'll call ctx->Driver.NewTextureObject() to create the default
1310     * textures.
1311     */
1312    ctx->Driver = *driverFunctions;
1313    ctx->DriverCtx = driverContext;
1314
1315    if (share_list) {
1316       /* share state with another context */
1317       ctx->Shared = share_list->Shared;
1318    }
1319    else {
1320       /* allocate new, unshared state */
1321       if (!alloc_shared_state( ctx )) {
1322          return GL_FALSE;
1323       }
1324    }
1325    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1326    ctx->Shared->RefCount++;
1327    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1328
1329    if (!init_attrib_groups( ctx )) {
1330       free_shared_state(ctx, ctx->Shared);
1331       return GL_FALSE;
1332    }
1333
1334    /* setup the API dispatch tables */
1335    ctx->Exec = alloc_dispatch_table();
1336    ctx->Save = alloc_dispatch_table();
1337    if (!ctx->Exec || !ctx->Save) {
1338       free_shared_state(ctx, ctx->Shared);
1339       if (ctx->Exec)
1340          _mesa_free(ctx->Exec);
1341    }
1342    _mesa_init_exec_table(ctx->Exec);
1343    ctx->CurrentDispatch = ctx->Exec;
1344 #if _HAVE_FULL_GL
1345    _mesa_init_dlist_table(ctx->Save);
1346    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
1347    /* Neutral tnl module stuff */
1348    _mesa_init_exec_vtxfmt( ctx );
1349    ctx->TnlModule.Current = NULL;
1350    ctx->TnlModule.SwapCount = 0;
1351 #endif
1352
1353    ctx->_MaintainTexEnvProgram = (_mesa_getenv("MESA_TEX_PROG") != NULL);
1354    ctx->_UseTexEnvProgram = ctx->_MaintainTexEnvProgram;
1355
1356    ctx->_MaintainTnlProgram = (_mesa_getenv("MESA_TNL_PROG") != NULL);
1357    if (ctx->_MaintainTnlProgram)
1358       ctx->_MaintainTexEnvProgram = 1; /* this is required... */
1359
1360    ctx->FirstTimeCurrent = GL_TRUE;
1361
1362    return GL_TRUE;
1363 }
1364
1365
1366 /**
1367  * Allocate and initialize a GLcontext structure.
1368  * Note that the driver needs to pass in its dd_function_table here since
1369  * we need to at least call driverFunctions->NewTextureObject to initialize
1370  * the rendering context.
1371  *
1372  * \param visual a GLvisual pointer (we copy the struct contents)
1373  * \param share_list another context to share display lists with or NULL
1374  * \param driverFunctions points to the dd_function_table into which the
1375  *        driver has plugged in all its special functions.
1376  * \param driverCtx points to the device driver's private context state
1377  *
1378  * \return pointer to a new __GLcontextRec or NULL if error.
1379  */
1380 GLcontext *
1381 _mesa_create_context( const GLvisual *visual,
1382                       GLcontext *share_list,
1383                       const struct dd_function_table *driverFunctions,
1384                       void *driverContext )
1385
1386 {
1387    GLcontext *ctx;
1388
1389    ASSERT(visual);
1390    ASSERT(driverContext);
1391
1392    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
1393    if (!ctx)
1394       return NULL;
1395
1396    if (_mesa_initialize_context(ctx, visual, share_list,
1397                                 driverFunctions, driverContext)) {
1398       return ctx;
1399    }
1400    else {
1401       _mesa_free(ctx);
1402       return NULL;
1403    }
1404 }
1405
1406
1407 /**
1408  * Free the data associated with the given context.
1409  *
1410  * But doesn't free the GLcontext struct itself.
1411  *
1412  * \sa _mesa_initialize_context() and init_attrib_groups().
1413  */
1414 void
1415 _mesa_free_context_data( GLcontext *ctx )
1416 {
1417    /* if we're destroying the current context, unbind it first */
1418    if (ctx == _mesa_get_current_context()) {
1419       _mesa_make_current(NULL, NULL, NULL);
1420    }
1421
1422    _mesa_free_lighting_data( ctx );
1423    _mesa_free_eval_data( ctx );
1424    _mesa_free_texture_data( ctx );
1425    _mesa_free_matrix_data( ctx );
1426    _mesa_free_viewport_data( ctx );
1427    _mesa_free_colortables_data( ctx );
1428    _mesa_free_program_data(ctx);
1429    _mesa_free_query_data(ctx);
1430
1431 #if FEATURE_ARB_vertex_buffer_object
1432    _mesa_delete_buffer_object(ctx, ctx->Array.NullBufferObj);
1433 #endif
1434    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
1435
1436    /* free dispatch tables */
1437    _mesa_free(ctx->Exec);
1438    _mesa_free(ctx->Save);
1439
1440    /* Shared context state (display lists, textures, etc) */
1441    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1442    ctx->Shared->RefCount--;
1443    assert(ctx->Shared->RefCount >= 0);
1444    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1445    if (ctx->Shared->RefCount == 0) {
1446       /* free shared state */
1447       free_shared_state( ctx, ctx->Shared );
1448    }
1449
1450    if (ctx->Extensions.String)
1451       _mesa_free((void *) ctx->Extensions.String);
1452 }
1453
1454
1455 /**
1456  * Destroy a GLcontext structure.
1457  *
1458  * \param ctx GL context.
1459  *
1460  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1461  */
1462 void
1463 _mesa_destroy_context( GLcontext *ctx )
1464 {
1465    if (ctx) {
1466       _mesa_free_context_data(ctx);
1467       _mesa_free( (void *) ctx );
1468    }
1469 }
1470
1471
1472 #if _HAVE_FULL_GL
1473 /**
1474  * Copy attribute groups from one context to another.
1475  *
1476  * \param src source context
1477  * \param dst destination context
1478  * \param mask bitwise OR of GL_*_BIT flags
1479  *
1480  * According to the bits specified in \p mask, copies the corresponding
1481  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1482  * memcpy is not enough due to the existence of internal pointers in their data
1483  * structures.
1484  */
1485 void
1486 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1487 {
1488    if (mask & GL_ACCUM_BUFFER_BIT) {
1489       /* OK to memcpy */
1490       dst->Accum = src->Accum;
1491    }
1492    if (mask & GL_COLOR_BUFFER_BIT) {
1493       /* OK to memcpy */
1494       dst->Color = src->Color;
1495    }
1496    if (mask & GL_CURRENT_BIT) {
1497       /* OK to memcpy */
1498       dst->Current = src->Current;
1499    }
1500    if (mask & GL_DEPTH_BUFFER_BIT) {
1501       /* OK to memcpy */
1502       dst->Depth = src->Depth;
1503    }
1504    if (mask & GL_ENABLE_BIT) {
1505       /* no op */
1506    }
1507    if (mask & GL_EVAL_BIT) {
1508       /* OK to memcpy */
1509       dst->Eval = src->Eval;
1510    }
1511    if (mask & GL_FOG_BIT) {
1512       /* OK to memcpy */
1513       dst->Fog = src->Fog;
1514    }
1515    if (mask & GL_HINT_BIT) {
1516       /* OK to memcpy */
1517       dst->Hint = src->Hint;
1518    }
1519    if (mask & GL_LIGHTING_BIT) {
1520       GLuint i;
1521       /* begin with memcpy */
1522       dst->Light = src->Light;
1523       /* fixup linked lists to prevent pointer insanity */
1524       make_empty_list( &(dst->Light.EnabledList) );
1525       for (i = 0; i < MAX_LIGHTS; i++) {
1526          if (dst->Light.Light[i].Enabled) {
1527             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1528          }
1529       }
1530    }
1531    if (mask & GL_LINE_BIT) {
1532       /* OK to memcpy */
1533       dst->Line = src->Line;
1534    }
1535    if (mask & GL_LIST_BIT) {
1536       /* OK to memcpy */
1537       dst->List = src->List;
1538    }
1539    if (mask & GL_PIXEL_MODE_BIT) {
1540       /* OK to memcpy */
1541       dst->Pixel = src->Pixel;
1542    }
1543    if (mask & GL_POINT_BIT) {
1544       /* OK to memcpy */
1545       dst->Point = src->Point;
1546    }
1547    if (mask & GL_POLYGON_BIT) {
1548       /* OK to memcpy */
1549       dst->Polygon = src->Polygon;
1550    }
1551    if (mask & GL_POLYGON_STIPPLE_BIT) {
1552       /* Use loop instead of MEMCPY due to problem with Portland Group's
1553        * C compiler.  Reported by John Stone.
1554        */
1555       GLuint i;
1556       for (i = 0; i < 32; i++) {
1557          dst->PolygonStipple[i] = src->PolygonStipple[i];
1558       }
1559    }
1560    if (mask & GL_SCISSOR_BIT) {
1561       /* OK to memcpy */
1562       dst->Scissor = src->Scissor;
1563    }
1564    if (mask & GL_STENCIL_BUFFER_BIT) {
1565       /* OK to memcpy */
1566       dst->Stencil = src->Stencil;
1567    }
1568    if (mask & GL_TEXTURE_BIT) {
1569       /* Cannot memcpy because of pointers */
1570       _mesa_copy_texture_state(src, dst);
1571    }
1572    if (mask & GL_TRANSFORM_BIT) {
1573       /* OK to memcpy */
1574       dst->Transform = src->Transform;
1575    }
1576    if (mask & GL_VIEWPORT_BIT) {
1577       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1578       dst->Viewport.X = src->Viewport.X;
1579       dst->Viewport.Y = src->Viewport.Y;
1580       dst->Viewport.Width = src->Viewport.Width;
1581       dst->Viewport.Height = src->Viewport.Height;
1582       dst->Viewport.Near = src->Viewport.Near;
1583       dst->Viewport.Far = src->Viewport.Far;
1584       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1585    }
1586
1587    /* XXX FIXME:  Call callbacks?
1588     */
1589    dst->NewState = _NEW_ALL;
1590 }
1591 #endif
1592
1593
1594 /**
1595  * Check if the given context can render into the given framebuffer
1596  * by checking visual attributes.
1597  *
1598  * XXX this may go away someday because we're moving toward more freedom
1599  * in binding contexts to drawables with different visual attributes.
1600  * The GL_EXT_f_b_o extension is prompting some of that.
1601  *
1602  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1603  */
1604 static GLboolean
1605 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1606 {
1607    const GLvisual *ctxvis = &ctx->Visual;
1608    const GLvisual *bufvis = &buffer->Visual;
1609
1610    if (ctxvis == bufvis)
1611       return GL_TRUE;
1612
1613    if (ctxvis->rgbMode != bufvis->rgbMode)
1614       return GL_FALSE;
1615 #if 0
1616    /* disabling this fixes the fgl_glxgears pbuffer demo */
1617    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1618       return GL_FALSE;
1619 #endif
1620    if (ctxvis->stereoMode && !bufvis->stereoMode)
1621       return GL_FALSE;
1622    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1623       return GL_FALSE;
1624    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1625       return GL_FALSE;
1626    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1627       return GL_FALSE;
1628    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1629       return GL_FALSE;
1630    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1631       return GL_FALSE;
1632    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1633       return GL_FALSE;
1634    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1635       return GL_FALSE;
1636    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1637       return GL_FALSE;
1638
1639    return GL_TRUE;
1640 }
1641
1642
1643 /**
1644  * Do one-time initialization for the given framebuffer.  Specifically,
1645  * ask the driver for the window's current size and update the framebuffer
1646  * object to match.
1647  * Really, the device driver should totally take care of this.
1648  */
1649 static void
1650 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1651 {
1652    GLuint width, height;
1653    if (ctx->Driver.GetBufferSize) {
1654       ctx->Driver.GetBufferSize(fb, &width, &height);
1655       if (ctx->Driver.ResizeBuffers)
1656          ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1657       fb->Initialized = GL_TRUE;
1658    }
1659 }
1660
1661
1662 /**
1663  * Bind the given context to the given drawBuffer and readBuffer and
1664  * make it the current context for the calling thread.
1665  * We'll render into the drawBuffer and read pixels from the
1666  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1667  *
1668  * We check that the context's and framebuffer's visuals are compatible
1669  * and return immediately if they're not.
1670  *
1671  * \param newCtx  the new GL context. If NULL then there will be no current GL
1672  *                context.
1673  * \param drawBuffer  the drawing framebuffer
1674  * \param readBuffer  the reading framebuffer
1675  */
1676 void
1677 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1678                     GLframebuffer *readBuffer )
1679 {
1680    if (MESA_VERBOSE & VERBOSE_API)
1681       _mesa_debug(newCtx, "_mesa_make_current()\n");
1682
1683    /* Check that the context's and framebuffer's visuals are compatible.
1684     */
1685    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1686       if (!check_compatible(newCtx, drawBuffer)) {
1687          _mesa_warning(newCtx,
1688               "MakeCurrent: incompatible visuals for context and drawbuffer");
1689          return;
1690       }
1691    }
1692    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1693       if (!check_compatible(newCtx, readBuffer)) {
1694          _mesa_warning(newCtx,
1695               "MakeCurrent: incompatible visuals for context and readbuffer");
1696          return;
1697       }
1698    }
1699
1700    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1701    _glapi_set_context((void *) newCtx);
1702    ASSERT(_mesa_get_current_context() == newCtx);
1703
1704    if (!newCtx) {
1705       _glapi_set_dispatch(NULL);  /* none current */
1706    }
1707    else {
1708       _glapi_set_dispatch(newCtx->CurrentDispatch);
1709
1710       if (drawBuffer && readBuffer) {
1711          /* TODO: check if newCtx and buffer's visual match??? */
1712
1713          ASSERT(drawBuffer->Name == 0);
1714          ASSERT(readBuffer->Name == 0);
1715          newCtx->WinSysDrawBuffer = drawBuffer;
1716          newCtx->WinSysReadBuffer = readBuffer;
1717
1718          /*
1719           * Only set the context's Draw/ReadBuffer fields if they're NULL
1720           * or not bound to a user-created FBO.
1721           */
1722          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1723             newCtx->DrawBuffer = drawBuffer;
1724          }
1725          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1726             newCtx->ReadBuffer = readBuffer;
1727          }
1728
1729          newCtx->NewState |= _NEW_BUFFERS;
1730
1731 #if 1
1732          /* We want to get rid of these lines: */
1733
1734 #if _HAVE_FULL_GL
1735          if (!drawBuffer->Initialized) {
1736             initialize_framebuffer_size(newCtx, drawBuffer);
1737          }
1738          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1739             initialize_framebuffer_size(newCtx, readBuffer);
1740          }
1741
1742          _mesa_resizebuffers(newCtx);
1743 #endif
1744
1745 #else
1746          /* We want the drawBuffer and readBuffer to be initialized by
1747           * the driver.
1748           * This generally means the Width and Height match the actual
1749           * window size and the renderbuffers (both hardware and software
1750           * based) are allocated to match.  The later can generally be
1751           * done with a call to _mesa_resize_framebuffer().
1752           *
1753           * It's theoretically possible for a buffer to have zero width
1754           * or height, but for now, assert check that the driver did what's
1755           * expected of it.
1756           */
1757          ASSERT(drawBuffer->Width > 0);
1758          ASSERT(drawBuffer->Height > 0);
1759 #endif
1760
1761          if (newCtx->FirstTimeCurrent) {
1762             /* set initial viewport and scissor size now */
1763             _mesa_set_viewport(newCtx, 0, 0,
1764                                drawBuffer->Width, drawBuffer->Height);
1765             _mesa_set_scissor(newCtx, 0, 0,
1766                               drawBuffer->Width, drawBuffer->Height );
1767             check_context_limits(newCtx);
1768          }
1769       }
1770
1771       /* We can use this to help debug user's problems.  Tell them to set
1772        * the MESA_INFO env variable before running their app.  Then the
1773        * first time each context is made current we'll print some useful
1774        * information.
1775        */
1776       if (newCtx->FirstTimeCurrent) {
1777          if (_mesa_getenv("MESA_INFO")) {
1778             _mesa_print_info();
1779          }
1780          newCtx->FirstTimeCurrent = GL_FALSE;
1781       }
1782    }
1783 }
1784
1785
1786 /**
1787  * Make context 'ctx' share the display lists, textures and programs
1788  * that are associated with 'ctxToShare'.
1789  * Any display lists, textures or programs associated with 'ctx' will
1790  * be deleted if nobody else is sharing them.
1791  */
1792 GLboolean
1793 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1794 {
1795    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1796       ctx->Shared->RefCount--;
1797       if (ctx->Shared->RefCount == 0) {
1798          free_shared_state(ctx, ctx->Shared);
1799       }
1800       ctx->Shared = ctxToShare->Shared;
1801       ctx->Shared->RefCount++;
1802       return GL_TRUE;
1803    }
1804    else {
1805       return GL_FALSE;
1806    }
1807 }
1808
1809
1810
1811 /**
1812  * Get current context for the calling thread.
1813  *
1814  * \return pointer to the current GL context.
1815  *
1816  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1817  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in context.h.
1818  */
1819 GLcontext *
1820 _mesa_get_current_context( void )
1821 {
1822    return (GLcontext *) _glapi_get_context();
1823 }
1824
1825 /**
1826  * Get context's current API dispatch table.
1827  *
1828  * It'll either be the immediate-mode execute dispatcher or the display list
1829  * compile dispatcher.
1830  *
1831  * \param ctx GL context.
1832  *
1833  * \return pointer to dispatch_table.
1834  *
1835  * Simply returns __GLcontextRec::CurrentDispatch.
1836  */
1837 struct _glapi_table *
1838 _mesa_get_dispatch(GLcontext *ctx)
1839 {
1840    return ctx->CurrentDispatch;
1841 }
1842
1843 /*@}*/
1844
1845
1846 /**********************************************************************/
1847 /** \name Miscellaneous functions                                     */
1848 /**********************************************************************/
1849 /*@{*/
1850
1851 /**
1852  * Record an error.
1853  *
1854  * \param ctx GL context.
1855  * \param error error code.
1856  *
1857  * Records the given error code and call the driver's dd_function_table::Error
1858  * function if defined.
1859  *
1860  * \sa
1861  * This is called via _mesa_error().
1862  */
1863 void
1864 _mesa_record_error( GLcontext *ctx, GLenum error )
1865 {
1866    if (!ctx)
1867       return;
1868
1869    if (ctx->ErrorValue == GL_NO_ERROR) {
1870       ctx->ErrorValue = error;
1871    }
1872
1873    /* Call device driver's error handler, if any.  This is used on the Mac. */
1874    if (ctx->Driver.Error) {
1875       (*ctx->Driver.Error)( ctx );
1876    }
1877 }
1878
1879 /**
1880  * Execute glFinish().
1881  *
1882  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1883  * dd_function_table::Finish driver callback, if not NULL.
1884  */
1885 void GLAPIENTRY
1886 _mesa_Finish( void )
1887 {
1888    GET_CURRENT_CONTEXT(ctx);
1889    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1890    if (ctx->Driver.Finish) {
1891       (*ctx->Driver.Finish)( ctx );
1892    }
1893 }
1894
1895 /**
1896  * Execute glFlush().
1897  *
1898  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1899  * dd_function_table::Flush driver callback, if not NULL.
1900  */
1901 void GLAPIENTRY
1902 _mesa_Flush( void )
1903 {
1904    GET_CURRENT_CONTEXT(ctx);
1905    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1906    if (ctx->Driver.Flush) {
1907       (*ctx->Driver.Flush)( ctx );
1908    }
1909 }
1910
1911
1912 /*@}*/