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 #if FEATURE_EXT_framebuffer_object
 739    ss->FrameBuffers = _mesa_NewHashTable();
 740    if (!ss->FrameBuffers)
 741       goto cleanup;
 742    ss->RenderBuffers = _mesa_NewHashTable();
 743    if (!ss->RenderBuffers)
 744       goto cleanup;
 745 #endif
 746
 747
 748    return GL_TRUE;
 749
 750  cleanup:
 751    /* Ran out of memory at some point.  Free everything and return NULL */
 752    if (ss->DisplayList)
 753       _mesa_DeleteHashTable(ss->DisplayList);
 754    if (ss->TexObjects)
 755       _mesa_DeleteHashTable(ss->TexObjects);
 756 #if FEATURE_NV_vertex_program
 757    if (ss->Programs)
 758       _mesa_DeleteHashTable(ss->Programs);
 759 #endif
 760 #if FEATURE_ARB_vertex_program
 761    if (ss->DefaultVertexProgram)
 762       ctx->Driver.DeleteProgram(ctx, ss->DefaultVertexProgram);
 763 #endif
 764 #if FEATURE_ARB_fragment_program
 765    if (ss->DefaultFragmentProgram)
 766       ctx->Driver.DeleteProgram(ctx, ss->DefaultFragmentProgram);
 767 #endif
 768 #if FEATURE_ATI_fragment_shader
 769    if (ss->DefaultFragmentShader)
 770       _mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
 771 #endif
 772 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 773    if (ss->BufferObjects)
 774       _mesa_DeleteHashTable(ss->BufferObjects);
 775 #endif
 776
 777    if (ss->ArrayObjects)
 778       _mesa_DeleteHashTable (ss->ArrayObjects);
 779
 780 #if FEATURE_ARB_shader_objects
 781    if (ss->GL2Objects)
 782       _mesa_DeleteHashTable (ss->GL2Objects);
 783 #endif
 784
 785 #if FEATURE_EXT_framebuffer_object
 786    if (ss->FrameBuffers)
 787       _mesa_DeleteHashTable(ss->FrameBuffers);
 788    if (ss->RenderBuffers)
 789       _mesa_DeleteHashTable(ss->RenderBuffers);
 790 #endif
 791
 792    if (ss->Default1D)
 793       (*ctx->Driver.DeleteTexture)(ctx, ss->Default1D);
 794    if (ss->Default2D)
 795       (*ctx->Driver.DeleteTexture)(ctx, ss->Default2D);
 796    if (ss->Default3D)
 797       (*ctx->Driver.DeleteTexture)(ctx, ss->Default3D);
 798    if (ss->DefaultCubeMap)
 799       (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultCubeMap);
 800    if (ss->DefaultRect)
 801       (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultRect);
 802    if (ss)
 803       _mesa_free(ss);
 804    return GL_FALSE;
 805 }
 806
 807
 808 /**
 809  * Callback for deleting a display list.  Called by _mesa_HashDeleteAll().
 810  */
 811 static void
 812 delete_displaylist_cb(GLuint id, void *data, void *userData)
 813 {
 814    struct mesa_display_list *list = (struct mesa_display_list *) data;
 815    GLcontext *ctx = (GLcontext *) userData;
 816    _mesa_delete_list(ctx, list);
 817 }
 818
 819 /**
 820  * Callback for deleting a texture object.  Called by _mesa_HashDeleteAll().
 821  */
 822 static void
 823 delete_texture_cb(GLuint id, void *data, void *userData)
 824 {
 825    struct gl_texture_object *texObj = (struct gl_texture_object *) data;
 826    GLcontext *ctx = (GLcontext *) userData;
 827    ctx->Driver.DeleteTexture(ctx, texObj);
 828 }
 829
 830 /**
 831  * Callback for deleting a program object.  Called by _mesa_HashDeleteAll().
 832  */
 833 static void
 834 delete_program_cb(GLuint id, void *data, void *userData)
 835 {
 836    struct gl_program *prog = (struct gl_program *) data;
 837    GLcontext *ctx = (GLcontext *) userData;
 838    ctx->Driver.DeleteProgram(ctx, prog);
 839 }
 840
 841 /**
 842  * Callback for deleting an ATI fragment shader object.
 843  * Called by _mesa_HashDeleteAll().
 844  */
 845 static void
 846 delete_fragshader_cb(GLuint id, void *data, void *userData)
 847 {
 848    struct ati_fragment_shader *shader = (struct ati_fragment_shader *) data;
 849    GLcontext *ctx = (GLcontext *) userData;
 850    _mesa_delete_ati_fragment_shader(ctx, shader);
 851 }
 852
 853 /**
 854  * Callback for deleting a buffer object.  Called by _mesa_HashDeleteAll().
 855  */
 856 static void
 857 delete_bufferobj_cb(GLuint id, void *data, void *userData)
 858 {
 859    struct gl_buffer_object *bufObj = (struct gl_buffer_object *) data;
 860    GLcontext *ctx = (GLcontext *) userData;
 861    ctx->Driver.DeleteBuffer(ctx, bufObj);
 862 }
 863
 864 /**
 865  * Callback for deleting an array object.  Called by _mesa_HashDeleteAll().
 866  */
 867 static void
 868 delete_arrayobj_cb(GLuint id, void *data, void *userData)
 869 {
 870    struct gl_array_object *arrayObj = (struct gl_array_object *) data;
 871    GLcontext *ctx = (GLcontext *) userData;
 872    _mesa_delete_array_object(ctx, arrayObj);
 873 }
 874
 875
 876 /**
 877  * Deallocate a shared state object and all children structures.
 878  *
 879  * \param ctx GL context.
 880  * \param ss shared state pointer.
 881  *
 882  * Frees the display lists, the texture objects (calling the driver texture
 883  * deletion callback to free its private data) and the vertex programs, as well
 884  * as their hash tables.
 885  *
 886  * \sa alloc_shared_state().
 887  */
 888 static void
 889 free_shared_state( GLcontext *ctx, struct gl_shared_state *ss )
 890 {
 891    /*
 892     * Free display lists
 893     */
 894    _mesa_HashDeleteAll(ss->DisplayList, delete_displaylist_cb, ctx);
 895    _mesa_DeleteHashTable(ss->DisplayList);
 896
 897    /*
 898     * Free texture objects
 899     */
 900    ASSERT(ctx->Driver.DeleteTexture);
 901    /* the default textures */
 902    ctx->Driver.DeleteTexture(ctx, ss->Default1D);
 903    ctx->Driver.DeleteTexture(ctx, ss->Default2D);
 904    ctx->Driver.DeleteTexture(ctx, ss->Default3D);
 905    ctx->Driver.DeleteTexture(ctx, ss->DefaultCubeMap);
 906    ctx->Driver.DeleteTexture(ctx, ss->DefaultRect);
 907    /* all other textures */
 908    _mesa_HashDeleteAll(ss->TexObjects, delete_texture_cb, ctx);
 909    _mesa_DeleteHashTable(ss->TexObjects);
 910
 911 #if defined(FEATURE_NV_vertex_program) || defined(FEATURE_NV_fragment_program)
 912    _mesa_HashDeleteAll(ss->Programs, delete_program_cb, ctx);
 913    _mesa_DeleteHashTable(ss->Programs);
 914 #endif
 915 #if FEATURE_ARB_vertex_program
 916    _mesa_delete_program(ctx, ss->DefaultVertexProgram);
 917 #endif
 918 #if FEATURE_ARB_fragment_program
 919    _mesa_delete_program(ctx, ss->DefaultFragmentProgram);
 920 #endif
 921
 922 #if FEATURE_ATI_fragment_shader
 923    _mesa_HashDeleteAll(ss->ATIShaders, delete_fragshader_cb, ctx);
 924    _mesa_DeleteHashTable(ss->ATIShaders);
 925    _mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
 926 #endif
 927
 928 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 929    _mesa_HashDeleteAll(ss->BufferObjects, delete_bufferobj_cb, ctx);
 930    _mesa_DeleteHashTable(ss->BufferObjects);
 931 #endif
 932
 933    _mesa_HashDeleteAll(ss->ArrayObjects, delete_arrayobj_cb, ctx);
 934    _mesa_DeleteHashTable(ss->ArrayObjects);
 935
 936 #if FEATURE_ARB_shader_objects
 937    _mesa_DeleteHashTable(ss->GL2Objects);
 938 #endif
 939
 940 #if FEATURE_EXT_framebuffer_object
 941    _mesa_DeleteHashTable(ss->FrameBuffers);
 942    _mesa_DeleteHashTable(ss->RenderBuffers);
 943 #endif
 944
 945    _glthread_DESTROY_MUTEX(ss->Mutex);
 946
 947    _mesa_free(ss);
 948 }
 949
 950
 951 /**
 952  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 953  */
 954 static void
 955 _mesa_init_current( GLcontext *ctx )
 956 {
 957    GLuint i;
 958
 959    /* Init all to (0,0,0,1) */
 960    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 961       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 962    }
 963
 964    /* redo special cases: */
 965    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 1.0 );
 966    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 967    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 968    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 969    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_FOG], 0.0, 0.0, 0.0, 0.0 );
 970    ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX][0] = 1.0;
 971    ctx->Current.EdgeFlag = GL_TRUE;
 972 }
 973
 974
 975 /**
 976  * Init vertex/fragment program native limits from logical limits.
 977  */
 978 static void
 979 init_natives(struct gl_program_constants *prog)
 980 {
 981    prog->MaxNativeInstructions = prog->MaxInstructions;
 982    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 983    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 984    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 985    prog->MaxNativeAttribs = prog->MaxAttribs;
 986    prog->MaxNativeTemps = prog->MaxTemps;
 987    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 988    prog->MaxNativeParameters = prog->MaxParameters;
 989 }
 990
 991
 992 /**
 993  * Initialize fields of gl_constants (aka ctx->Const.*).
 994  * Use defaults from config.h.  The device drivers will often override
 995  * some of these values (such as number of texture units).
 996  */
 997 static void
 998 _mesa_init_constants( GLcontext *ctx )
 999 {
1000    assert(ctx);
1001
1002    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
1003    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
1004
1005    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_COORD_UNITS);
1006    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_IMAGE_UNITS);
1007
1008    /* Constants, may be overriden (usually only reduced) by device drivers */
1009    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
1010    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
1011    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
1012    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
1013    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
1014    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
1015    ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
1016                                      ctx->Const.MaxTextureImageUnits);
1017    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
1018    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
1019    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
1020    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
1021    ctx->Const.MinPointSize = MIN_POINT_SIZE;
1022    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
1023    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
1024    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
1025    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
1026    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
1027    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
1028    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
1029    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
1030    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
1031    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
1032    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
1033    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
1034    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
1035    ctx->Const.MaxLights = MAX_LIGHTS;
1036    ctx->Const.MaxShininess = 128.0;
1037    ctx->Const.MaxSpotExponent = 128.0;
1038    ctx->Const.MaxViewportWidth = MAX_WIDTH;
1039    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
1040 #if FEATURE_ARB_vertex_program
1041    ctx->Const.VertexProgram.MaxInstructions = MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS;
1042    ctx->Const.VertexProgram.MaxAluInstructions = 0;
1043    ctx->Const.VertexProgram.MaxTexInstructions = 0;
1044    ctx->Const.VertexProgram.MaxTexIndirections = 0;
1045    ctx->Const.VertexProgram.MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
1046    ctx->Const.VertexProgram.MaxTemps = MAX_NV_VERTEX_PROGRAM_TEMPS;
1047    ctx->Const.VertexProgram.MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;
1048    ctx->Const.VertexProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
1049    ctx->Const.VertexProgram.MaxEnvParams = MAX_NV_VERTEX_PROGRAM_PARAMS;
1050    ctx->Const.VertexProgram.MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
1051    init_natives(&ctx->Const.VertexProgram);
1052 #endif
1053 #if FEATURE_ARB_fragment_program
1054    ctx->Const.FragmentProgram.MaxInstructions = MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS;
1055    ctx->Const.FragmentProgram.MaxAluInstructions = MAX_FRAGMENT_PROGRAM_ALU_INSTRUCTIONS;
1056    ctx->Const.FragmentProgram.MaxTexInstructions = MAX_FRAGMENT_PROGRAM_TEX_INSTRUCTIONS;
1057    ctx->Const.FragmentProgram.MaxTexIndirections = MAX_FRAGMENT_PROGRAM_TEX_INDIRECTIONS;
1058    ctx->Const.FragmentProgram.MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
1059    ctx->Const.FragmentProgram.MaxTemps = MAX_NV_FRAGMENT_PROGRAM_TEMPS;
1060    ctx->Const.FragmentProgram.MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1061    ctx->Const.FragmentProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
1062    ctx->Const.FragmentProgram.MaxEnvParams = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1063    ctx->Const.FragmentProgram.MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
1064    init_natives(&ctx->Const.FragmentProgram);
1065 #endif
1066    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
1067    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
1068
1069    /* If we're running in the X server, do bounds checking to prevent
1070     * segfaults and server crashes!
1071     */
1072 #if defined(XFree86LOADER) && defined(IN_MODULE)
1073    ctx->Const.CheckArrayBounds = GL_TRUE;
1074 #else
1075    ctx->Const.CheckArrayBounds = GL_FALSE;
1076 #endif
1077
1078    /* GL_ARB_draw_buffers */
1079    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
1080
1081    /* GL_OES_read_format */
1082    ctx->Const.ColorReadFormat = GL_RGBA;
1083    ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
1084
1085 #if FEATURE_EXT_framebuffer_object
1086    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
1087    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
1088 #endif
1089
1090    /* sanity checks */
1091    ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
1092                                              ctx->Const.MaxTextureCoordUnits));
1093    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
1094    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
1095 }
1096
1097
1098 /**
1099  * Do some sanity checks on the limits/constants for the given context.
1100  * Only called the first time a context is bound.
1101  */
1102 static void
1103 check_context_limits(GLcontext *ctx)
1104 {
1105    /* Many context limits/constants are limited by the size of
1106     * internal arrays.
1107     */
1108    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
1109    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
1110    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
1111    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
1112
1113    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
1114    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
1115
1116    /* make sure largest texture image is <= MAX_WIDTH in size */
1117    assert((1 << (ctx->Const.MaxTextureLevels -1 )) <= MAX_WIDTH);
1118    assert((1 << (ctx->Const.MaxCubeTextureLevels -1 )) <= MAX_WIDTH);
1119    assert((1 << (ctx->Const.Max3DTextureLevels -1 )) <= MAX_WIDTH);
1120
1121    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
1122
1123    /* XXX probably add more tests */
1124 }
1125
1126
1127 /**
1128  * Initialize the attribute groups in a GL context.
1129  *
1130  * \param ctx GL context.
1131  *
1132  * Initializes all the attributes, calling the respective <tt>init*</tt>
1133  * functions for the more complex data structures.
1134  */
1135 static GLboolean
1136 init_attrib_groups( GLcontext *ctx )
1137 {
1138    assert(ctx);
1139
1140    /* Constants */
1141    _mesa_init_constants( ctx );
1142
1143    /* Extensions */
1144    _mesa_init_extensions( ctx );
1145
1146    /* Attribute Groups */
1147    _mesa_init_accum( ctx );
1148    _mesa_init_attrib( ctx );
1149    _mesa_init_buffer_objects( ctx );
1150    _mesa_init_color( ctx );
1151    _mesa_init_colortables( ctx );
1152    _mesa_init_current( ctx );
1153    _mesa_init_depth( ctx );
1154    _mesa_init_debug( ctx );
1155    _mesa_init_display_list( ctx );
1156    _mesa_init_eval( ctx );
1157    _mesa_init_feedback( ctx );
1158    _mesa_init_fog( ctx );
1159    _mesa_init_histogram( ctx );
1160    _mesa_init_hint( ctx );
1161    _mesa_init_line( ctx );
1162    _mesa_init_lighting( ctx );
1163    _mesa_init_matrix( ctx );
1164    _mesa_init_multisample( ctx );
1165    _mesa_init_pixel( ctx );
1166    _mesa_init_point( ctx );
1167    _mesa_init_polygon( ctx );
1168    _mesa_init_program( ctx );
1169    _mesa_init_query( ctx );
1170    _mesa_init_rastpos( ctx );
1171    _mesa_init_scissor( ctx );
1172    _mesa_init_shaderobjects (ctx);
1173    _mesa_init_stencil( ctx );
1174    _mesa_init_transform( ctx );
1175    _mesa_init_varray( ctx );
1176    _mesa_init_viewport( ctx );
1177
1178    if (!_mesa_init_texture( ctx ))
1179       return GL_FALSE;
1180
1181    _mesa_init_texture_s3tc( ctx );
1182    _mesa_init_texture_fxt1( ctx );
1183
1184    /* Miscellaneous */
1185    ctx->NewState = _NEW_ALL;
1186    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
1187    ctx->_Facing = 0;
1188
1189    return GL_TRUE;
1190 }
1191
1192
1193 /**
1194  * This is the default function we plug into all dispatch table slots
1195  * This helps prevents a segfault when someone calls a GL function without
1196  * first checking if the extension's supported.
1197  */
1198 static int
1199 generic_nop(void)
1200 {
1201    _mesa_problem(NULL, "User called no-op dispatch function (an unsupported extension function?)");
1202    return 0;
1203 }
1204
1205
1206 /**
1207  * Allocate and initialize a new dispatch table.
1208  */
1209 static struct _glapi_table *
1210 alloc_dispatch_table(void)
1211 {
1212    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1213     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
1214     * Mesa we do this to accomodate different versions of libGL and various
1215     * DRI drivers.
1216     */
1217    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
1218                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
1219    struct _glapi_table *table =
1220       (struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
1221    if (table) {
1222       _glapi_proc *entry = (_glapi_proc *) table;
1223       GLint i;
1224       for (i = 0; i < numEntries; i++) {
1225          entry[i] = (_glapi_proc) generic_nop;
1226       }
1227    }
1228    return table;
1229 }
1230
1231
1232 /**
1233  * Initialize a GLcontext struct (rendering context).
1234  *
1235  * This includes allocating all the other structs and arrays which hang off of
1236  * the context by pointers.
1237  * Note that the driver needs to pass in its dd_function_table here since
1238  * we need to at least call driverFunctions->NewTextureObject to create the
1239  * default texture objects.
1240  *
1241  * Called by _mesa_create_context().
1242  *
1243  * Performs the imports and exports callback tables initialization, and
1244  * miscellaneous one-time initializations. If no shared context is supplied one
1245  * is allocated, and increase its reference count.  Setups the GL API dispatch
1246  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1247  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1248  * for debug flags.
1249  *
1250  * \param ctx the context to initialize
1251  * \param visual describes the visual attributes for this context
1252  * \param share_list points to context to share textures, display lists,
1253  *        etc with, or NULL
1254  * \param driverFunctions table of device driver functions for this context
1255  *        to use
1256  * \param driverContext pointer to driver-specific context data
1257  */
1258 GLboolean
1259 _mesa_initialize_context( GLcontext *ctx,
1260                           const GLvisual *visual,
1261                           GLcontext *share_list,
1262                           const struct dd_function_table *driverFunctions,
1263                           void *driverContext )
1264 {
1265    ASSERT(driverContext);
1266    assert(driverFunctions->NewTextureObject);
1267    assert(driverFunctions->FreeTexImageData);
1268
1269    /* If the driver wants core Mesa to use special imports, it'll have to
1270     * override these defaults.
1271     */
1272    _mesa_init_default_imports( &(ctx->imports), driverContext );
1273
1274    /* initialize the exports (Mesa functions called by the window system) */
1275    _mesa_init_default_exports( &(ctx->exports) );
1276
1277    /* misc one-time initializations */
1278    one_time_init(ctx);
1279
1280    ctx->Visual = *visual;
1281    ctx->DrawBuffer = NULL;
1282    ctx->ReadBuffer = NULL;
1283    ctx->WinSysDrawBuffer = NULL;
1284    ctx->WinSysReadBuffer = NULL;
1285
1286    /* Plug in driver functions and context pointer here.
1287     * This is important because when we call alloc_shared_state() below
1288     * we'll call ctx->Driver.NewTextureObject() to create the default
1289     * textures.
1290     */
1291    ctx->Driver = *driverFunctions;
1292    ctx->DriverCtx = driverContext;
1293
1294    if (share_list) {
1295       /* share state with another context */
1296       ctx->Shared = share_list->Shared;
1297    }
1298    else {
1299       /* allocate new, unshared state */
1300       if (!alloc_shared_state( ctx )) {
1301          return GL_FALSE;
1302       }
1303    }
1304    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1305    ctx->Shared->RefCount++;
1306    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1307
1308    if (!init_attrib_groups( ctx )) {
1309       free_shared_state(ctx, ctx->Shared);
1310       return GL_FALSE;
1311    }
1312
1313    /* setup the API dispatch tables */
1314    ctx->Exec = alloc_dispatch_table();
1315    ctx->Save = alloc_dispatch_table();
1316    if (!ctx->Exec || !ctx->Save) {
1317       free_shared_state(ctx, ctx->Shared);
1318       if (ctx->Exec)
1319          _mesa_free(ctx->Exec);
1320    }
1321    _mesa_init_exec_table(ctx->Exec);
1322    ctx->CurrentDispatch = ctx->Exec;
1323 #if _HAVE_FULL_GL
1324    _mesa_init_dlist_table(ctx->Save);
1325    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
1326    /* Neutral tnl module stuff */
1327    _mesa_init_exec_vtxfmt( ctx );
1328    ctx->TnlModule.Current = NULL;
1329    ctx->TnlModule.SwapCount = 0;
1330 #endif
1331
1332    ctx->_MaintainTexEnvProgram = (_mesa_getenv("MESA_TEX_PROG") != NULL);
1333    ctx->_UseTexEnvProgram = ctx->_MaintainTexEnvProgram;
1334
1335    ctx->_MaintainTnlProgram = (_mesa_getenv("MESA_TNL_PROG") != NULL);
1336    if (ctx->_MaintainTnlProgram)
1337       ctx->_MaintainTexEnvProgram = 1; /* this is required... */
1338
1339    ctx->FirstTimeCurrent = GL_TRUE;
1340
1341    return GL_TRUE;
1342 }
1343
1344
1345 /**
1346  * Allocate and initialize a GLcontext structure.
1347  * Note that the driver needs to pass in its dd_function_table here since
1348  * we need to at least call driverFunctions->NewTextureObject to initialize
1349  * the rendering context.
1350  *
1351  * \param visual a GLvisual pointer (we copy the struct contents)
1352  * \param share_list another context to share display lists with or NULL
1353  * \param driverFunctions points to the dd_function_table into which the
1354  *        driver has plugged in all its special functions.
1355  * \param driverCtx points to the device driver's private context state
1356  *
1357  * \return pointer to a new __GLcontextRec or NULL if error.
1358  */
1359 GLcontext *
1360 _mesa_create_context( const GLvisual *visual,
1361                       GLcontext *share_list,
1362                       const struct dd_function_table *driverFunctions,
1363                       void *driverContext )
1364
1365 {
1366    GLcontext *ctx;
1367
1368    ASSERT(visual);
1369    ASSERT(driverContext);
1370
1371    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
1372    if (!ctx)
1373       return NULL;
1374
1375    if (_mesa_initialize_context(ctx, visual, share_list,
1376                                 driverFunctions, driverContext)) {
1377       return ctx;
1378    }
1379    else {
1380       _mesa_free(ctx);
1381       return NULL;
1382    }
1383 }
1384
1385
1386 /**
1387  * Free the data associated with the given context.
1388  *
1389  * But doesn't free the GLcontext struct itself.
1390  *
1391  * \sa _mesa_initialize_context() and init_attrib_groups().
1392  */
1393 void
1394 _mesa_free_context_data( GLcontext *ctx )
1395 {
1396    /* if we're destroying the current context, unbind it first */
1397    if (ctx == _mesa_get_current_context()) {
1398       _mesa_make_current(NULL, NULL, NULL);
1399    }
1400
1401    _mesa_free_lighting_data( ctx );
1402    _mesa_free_eval_data( ctx );
1403    _mesa_free_texture_data( ctx );
1404    _mesa_free_matrix_data( ctx );
1405    _mesa_free_viewport_data( ctx );
1406    _mesa_free_colortables_data( ctx );
1407    _mesa_free_program_data(ctx);
1408    _mesa_free_query_data(ctx);
1409
1410 #if FEATURE_ARB_vertex_buffer_object
1411    _mesa_delete_buffer_object(ctx, ctx->Array.NullBufferObj);
1412 #endif
1413    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
1414
1415    /* free dispatch tables */
1416    _mesa_free(ctx->Exec);
1417    _mesa_free(ctx->Save);
1418
1419    /* Shared context state (display lists, textures, etc) */
1420    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1421    ctx->Shared->RefCount--;
1422    assert(ctx->Shared->RefCount >= 0);
1423    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1424    if (ctx->Shared->RefCount == 0) {
1425       /* free shared state */
1426       free_shared_state( ctx, ctx->Shared );
1427    }
1428
1429    if (ctx->Extensions.String)
1430       _mesa_free((void *) ctx->Extensions.String);
1431 }
1432
1433
1434 /**
1435  * Destroy a GLcontext structure.
1436  *
1437  * \param ctx GL context.
1438  *
1439  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1440  */
1441 void
1442 _mesa_destroy_context( GLcontext *ctx )
1443 {
1444    if (ctx) {
1445       _mesa_free_context_data(ctx);
1446       _mesa_free( (void *) ctx );
1447    }
1448 }
1449
1450
1451 #if _HAVE_FULL_GL
1452 /**
1453  * Copy attribute groups from one context to another.
1454  *
1455  * \param src source context
1456  * \param dst destination context
1457  * \param mask bitwise OR of GL_*_BIT flags
1458  *
1459  * According to the bits specified in \p mask, copies the corresponding
1460  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1461  * memcpy is not enough due to the existence of internal pointers in their data
1462  * structures.
1463  */
1464 void
1465 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1466 {
1467    if (mask & GL_ACCUM_BUFFER_BIT) {
1468       /* OK to memcpy */
1469       dst->Accum = src->Accum;
1470    }
1471    if (mask & GL_COLOR_BUFFER_BIT) {
1472       /* OK to memcpy */
1473       dst->Color = src->Color;
1474    }
1475    if (mask & GL_CURRENT_BIT) {
1476       /* OK to memcpy */
1477       dst->Current = src->Current;
1478    }
1479    if (mask & GL_DEPTH_BUFFER_BIT) {
1480       /* OK to memcpy */
1481       dst->Depth = src->Depth;
1482    }
1483    if (mask & GL_ENABLE_BIT) {
1484       /* no op */
1485    }
1486    if (mask & GL_EVAL_BIT) {
1487       /* OK to memcpy */
1488       dst->Eval = src->Eval;
1489    }
1490    if (mask & GL_FOG_BIT) {
1491       /* OK to memcpy */
1492       dst->Fog = src->Fog;
1493    }
1494    if (mask & GL_HINT_BIT) {
1495       /* OK to memcpy */
1496       dst->Hint = src->Hint;
1497    }
1498    if (mask & GL_LIGHTING_BIT) {
1499       GLuint i;
1500       /* begin with memcpy */
1501       dst->Light = src->Light;
1502       /* fixup linked lists to prevent pointer insanity */
1503       make_empty_list( &(dst->Light.EnabledList) );
1504       for (i = 0; i < MAX_LIGHTS; i++) {
1505          if (dst->Light.Light[i].Enabled) {
1506             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1507          }
1508       }
1509    }
1510    if (mask & GL_LINE_BIT) {
1511       /* OK to memcpy */
1512       dst->Line = src->Line;
1513    }
1514    if (mask & GL_LIST_BIT) {
1515       /* OK to memcpy */
1516       dst->List = src->List;
1517    }
1518    if (mask & GL_PIXEL_MODE_BIT) {
1519       /* OK to memcpy */
1520       dst->Pixel = src->Pixel;
1521    }
1522    if (mask & GL_POINT_BIT) {
1523       /* OK to memcpy */
1524       dst->Point = src->Point;
1525    }
1526    if (mask & GL_POLYGON_BIT) {
1527       /* OK to memcpy */
1528       dst->Polygon = src->Polygon;
1529    }
1530    if (mask & GL_POLYGON_STIPPLE_BIT) {
1531       /* Use loop instead of MEMCPY due to problem with Portland Group's
1532        * C compiler.  Reported by John Stone.
1533        */
1534       GLuint i;
1535       for (i = 0; i < 32; i++) {
1536          dst->PolygonStipple[i] = src->PolygonStipple[i];
1537       }
1538    }
1539    if (mask & GL_SCISSOR_BIT) {
1540       /* OK to memcpy */
1541       dst->Scissor = src->Scissor;
1542    }
1543    if (mask & GL_STENCIL_BUFFER_BIT) {
1544       /* OK to memcpy */
1545       dst->Stencil = src->Stencil;
1546    }
1547    if (mask & GL_TEXTURE_BIT) {
1548       /* Cannot memcpy because of pointers */
1549       _mesa_copy_texture_state(src, dst);
1550    }
1551    if (mask & GL_TRANSFORM_BIT) {
1552       /* OK to memcpy */
1553       dst->Transform = src->Transform;
1554    }
1555    if (mask & GL_VIEWPORT_BIT) {
1556       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1557       dst->Viewport.X = src->Viewport.X;
1558       dst->Viewport.Y = src->Viewport.Y;
1559       dst->Viewport.Width = src->Viewport.Width;
1560       dst->Viewport.Height = src->Viewport.Height;
1561       dst->Viewport.Near = src->Viewport.Near;
1562       dst->Viewport.Far = src->Viewport.Far;
1563       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1564    }
1565
1566    /* XXX FIXME:  Call callbacks?
1567     */
1568    dst->NewState = _NEW_ALL;
1569 }
1570 #endif
1571
1572
1573 /**
1574  * Check if the given context can render into the given framebuffer
1575  * by checking visual attributes.
1576  *
1577  * XXX this may go away someday because we're moving toward more freedom
1578  * in binding contexts to drawables with different visual attributes.
1579  * The GL_EXT_f_b_o extension is prompting some of that.
1580  *
1581  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1582  */
1583 static GLboolean
1584 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1585 {
1586    const GLvisual *ctxvis = &ctx->Visual;
1587    const GLvisual *bufvis = &buffer->Visual;
1588
1589    if (ctxvis == bufvis)
1590       return GL_TRUE;
1591
1592    if (ctxvis->rgbMode != bufvis->rgbMode)
1593       return GL_FALSE;
1594 #if 0
1595    /* disabling this fixes the fgl_glxgears pbuffer demo */
1596    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1597       return GL_FALSE;
1598 #endif
1599    if (ctxvis->stereoMode && !bufvis->stereoMode)
1600       return GL_FALSE;
1601    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1602       return GL_FALSE;
1603    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1604       return GL_FALSE;
1605    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1606       return GL_FALSE;
1607    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1608       return GL_FALSE;
1609    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1610       return GL_FALSE;
1611    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1612       return GL_FALSE;
1613    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1614       return GL_FALSE;
1615    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1616       return GL_FALSE;
1617
1618    return GL_TRUE;
1619 }
1620
1621
1622 /**
1623  * Do one-time initialization for the given framebuffer.  Specifically,
1624  * ask the driver for the window's current size and update the framebuffer
1625  * object to match.
1626  * Really, the device driver should totally take care of this.
1627  */
1628 static void
1629 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1630 {
1631    GLuint width, height;
1632    ASSERT(ctx->Driver.GetBufferSize);
1633    ctx->Driver.GetBufferSize(fb, &width, &height);
1634    if (ctx->Driver.ResizeBuffers)
1635       ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1636    fb->Initialized = GL_TRUE;
1637 }
1638
1639
1640 /**
1641  * Bind the given context to the given drawBuffer and readBuffer and
1642  * make it the current context for the calling thread.
1643  * We'll render into the drawBuffer and read pixels from the
1644  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1645  *
1646  * We check that the context's and framebuffer's visuals are compatible
1647  * and return immediately if they're not.
1648  *
1649  * \param newCtx  the new GL context. If NULL then there will be no current GL
1650  *                context.
1651  * \param drawBuffer  the drawing framebuffer
1652  * \param readBuffer  the reading framebuffer
1653  */
1654 void
1655 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1656                     GLframebuffer *readBuffer )
1657 {
1658    if (MESA_VERBOSE & VERBOSE_API)
1659       _mesa_debug(newCtx, "_mesa_make_current()\n");
1660
1661    /* Check that the context's and framebuffer's visuals are compatible.
1662     */
1663    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1664       if (!check_compatible(newCtx, drawBuffer)) {
1665          _mesa_warning(newCtx,
1666               "MakeCurrent: incompatible visuals for context and drawbuffer");
1667          return;
1668       }
1669    }
1670    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1671       if (!check_compatible(newCtx, readBuffer)) {
1672          _mesa_warning(newCtx,
1673               "MakeCurrent: incompatible visuals for context and readbuffer");
1674          return;
1675       }
1676    }
1677
1678    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1679    _glapi_set_context((void *) newCtx);
1680    ASSERT(_mesa_get_current_context() == newCtx);
1681
1682    if (!newCtx) {
1683       _glapi_set_dispatch(NULL);  /* none current */
1684    }
1685    else {
1686       _glapi_set_dispatch(newCtx->CurrentDispatch);
1687
1688       if (drawBuffer && readBuffer) {
1689          /* TODO: check if newCtx and buffer's visual match??? */
1690
1691          ASSERT(drawBuffer->Name == 0);
1692          ASSERT(readBuffer->Name == 0);
1693          newCtx->WinSysDrawBuffer = drawBuffer;
1694          newCtx->WinSysReadBuffer = readBuffer;
1695
1696          /*
1697           * Only set the context's Draw/ReadBuffer fields if they're NULL
1698           * or not bound to a user-created FBO.
1699           */
1700          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1701             newCtx->DrawBuffer = drawBuffer;
1702          }
1703          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1704             newCtx->ReadBuffer = readBuffer;
1705          }
1706
1707          newCtx->NewState |= _NEW_BUFFERS;
1708
1709 #if _HAVE_FULL_GL
1710          if (!drawBuffer->Initialized) {
1711             initialize_framebuffer_size(newCtx, drawBuffer);
1712          }
1713          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1714             initialize_framebuffer_size(newCtx, readBuffer);
1715          }
1716
1717          _mesa_resizebuffers(newCtx);
1718 #endif
1719          if (newCtx->FirstTimeCurrent) {
1720             /* set initial viewport and scissor size now */
1721             _mesa_set_viewport(newCtx, 0, 0,
1722                                drawBuffer->Width, drawBuffer->Height);
1723             _mesa_set_scissor(newCtx, 0, 0,
1724                               drawBuffer->Width, drawBuffer->Height );
1725             check_context_limits(newCtx);
1726          }
1727       }
1728
1729       /* We can use this to help debug user's problems.  Tell them to set
1730        * the MESA_INFO env variable before running their app.  Then the
1731        * first time each context is made current we'll print some useful
1732        * information.
1733        */
1734       if (newCtx->FirstTimeCurrent) {
1735          if (_mesa_getenv("MESA_INFO")) {
1736             _mesa_print_info();
1737          }
1738          newCtx->FirstTimeCurrent = GL_FALSE;
1739       }
1740    }
1741 }
1742
1743
1744 /**
1745  * Make context 'ctx' share the display lists, textures and programs
1746  * that are associated with 'ctxToShare'.
1747  * Any display lists, textures or programs associated with 'ctx' will
1748  * be deleted if nobody else is sharing them.
1749  */
1750 GLboolean
1751 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1752 {
1753    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1754       ctx->Shared->RefCount--;
1755       if (ctx->Shared->RefCount == 0) {
1756          free_shared_state(ctx, ctx->Shared);
1757       }
1758       ctx->Shared = ctxToShare->Shared;
1759       ctx->Shared->RefCount++;
1760       return GL_TRUE;
1761    }
1762    else {
1763       return GL_FALSE;
1764    }
1765 }
1766
1767
1768
1769 /**
1770  * Get current context for the calling thread.
1771  *
1772  * \return pointer to the current GL context.
1773  *
1774  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1775  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in context.h.
1776  */
1777 GLcontext *
1778 _mesa_get_current_context( void )
1779 {
1780    return (GLcontext *) _glapi_get_context();
1781 }
1782
1783 /**
1784  * Get context's current API dispatch table.
1785  *
1786  * It'll either be the immediate-mode execute dispatcher or the display list
1787  * compile dispatcher.
1788  *
1789  * \param ctx GL context.
1790  *
1791  * \return pointer to dispatch_table.
1792  *
1793  * Simply returns __GLcontextRec::CurrentDispatch.
1794  */
1795 struct _glapi_table *
1796 _mesa_get_dispatch(GLcontext *ctx)
1797 {
1798    return ctx->CurrentDispatch;
1799 }
1800
1801 /*@}*/
1802
1803
1804 /**********************************************************************/
1805 /** \name Miscellaneous functions                                     */
1806 /**********************************************************************/
1807 /*@{*/
1808
1809 /**
1810  * Record an error.
1811  *
1812  * \param ctx GL context.
1813  * \param error error code.
1814  *
1815  * Records the given error code and call the driver's dd_function_table::Error
1816  * function if defined.
1817  *
1818  * \sa
1819  * This is called via _mesa_error().
1820  */
1821 void
1822 _mesa_record_error( GLcontext *ctx, GLenum error )
1823 {
1824    if (!ctx)
1825       return;
1826
1827    if (ctx->ErrorValue == GL_NO_ERROR) {
1828       ctx->ErrorValue = error;
1829    }
1830
1831    /* Call device driver's error handler, if any.  This is used on the Mac. */
1832    if (ctx->Driver.Error) {
1833       (*ctx->Driver.Error)( ctx );
1834    }
1835 }
1836
1837 /**
1838  * Execute glFinish().
1839  *
1840  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1841  * dd_function_table::Finish driver callback, if not NULL.
1842  */
1843 void GLAPIENTRY
1844 _mesa_Finish( void )
1845 {
1846    GET_CURRENT_CONTEXT(ctx);
1847    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1848    if (ctx->Driver.Finish) {
1849       (*ctx->Driver.Finish)( ctx );
1850    }
1851 }
1852
1853 /**
1854  * Execute glFlush().
1855  *
1856  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1857  * dd_function_table::Flush driver callback, if not NULL.
1858  */
1859 void GLAPIENTRY
1860 _mesa_Flush( void )
1861 {
1862    GET_CURRENT_CONTEXT(ctx);
1863    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1864    if (ctx->Driver.Flush) {
1865       (*ctx->Driver.Flush)( ctx );
1866    }
1867 }
1868
1869
1870 /*@}*/