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 /**
 881  * Deallocate a shared state object and all children structures.
 882  *
 883  * \param ctx GL context.
 884  * \param ss shared state pointer.
 885  *
 886  * Frees the display lists, the texture objects (calling the driver texture
 887  * deletion callback to free its private data) and the vertex programs, as well
 888  * as their hash tables.
 889  *
 890  * \sa alloc_shared_state().
 891  */
 892 static void
 893 free_shared_state( GLcontext *ctx, struct gl_shared_state *ss )
 894 {
 895    /*
 896     * Free display lists
 897     */
 898    _mesa_HashDeleteAll(ss->DisplayList, delete_displaylist_cb, ctx);
 899    _mesa_DeleteHashTable(ss->DisplayList);
 900
 901    /*
 902     * Free texture objects
 903     */
 904    ASSERT(ctx->Driver.DeleteTexture);
 905    /* the default textures */
 906    ctx->Driver.DeleteTexture(ctx, ss->Default1D);
 907    ctx->Driver.DeleteTexture(ctx, ss->Default2D);
 908    ctx->Driver.DeleteTexture(ctx, ss->Default3D);
 909    ctx->Driver.DeleteTexture(ctx, ss->DefaultCubeMap);
 910    ctx->Driver.DeleteTexture(ctx, ss->DefaultRect);
 911    /* all other textures */
 912    _mesa_HashDeleteAll(ss->TexObjects, delete_texture_cb, ctx);
 913    _mesa_DeleteHashTable(ss->TexObjects);
 914
 915 #if defined(FEATURE_NV_vertex_program) || defined(FEATURE_NV_fragment_program)
 916    _mesa_HashDeleteAll(ss->Programs, delete_program_cb, ctx);
 917    _mesa_DeleteHashTable(ss->Programs);
 918 #endif
 919 #if FEATURE_ARB_vertex_program
 920    _mesa_delete_program(ctx, ss->DefaultVertexProgram);
 921 #endif
 922 #if FEATURE_ARB_fragment_program
 923    _mesa_delete_program(ctx, ss->DefaultFragmentProgram);
 924 #endif
 925
 926 #if FEATURE_ATI_fragment_shader
 927    _mesa_HashDeleteAll(ss->ATIShaders, delete_fragshader_cb, ctx);
 928    _mesa_DeleteHashTable(ss->ATIShaders);
 929    _mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
 930 #endif
 931
 932 #if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
 933    _mesa_HashDeleteAll(ss->BufferObjects, delete_bufferobj_cb, ctx);
 934    _mesa_DeleteHashTable(ss->BufferObjects);
 935 #endif
 936
 937    _mesa_HashDeleteAll(ss->ArrayObjects, delete_arrayobj_cb, ctx);
 938    _mesa_DeleteHashTable(ss->ArrayObjects);
 939
 940 #if FEATURE_ARB_shader_objects
 941    _mesa_DeleteHashTable(ss->GL2Objects);
 942 #endif
 943
 944 #if FEATURE_EXT_framebuffer_object
 945    _mesa_DeleteHashTable(ss->FrameBuffers);
 946    _mesa_DeleteHashTable(ss->RenderBuffers);
 947 #endif
 948
 949    _glthread_DESTROY_MUTEX(ss->Mutex);
 950
 951    _mesa_free(ss);
 952 }
 953
 954
 955 /**
 956  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
 957  */
 958 static void
 959 _mesa_init_current( GLcontext *ctx )
 960 {
 961    GLuint i;
 962
 963    /* Init all to (0,0,0,1) */
 964    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 965       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
 966    }
 967
 968    /* redo special cases: */
 969    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 1.0 );
 970    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
 971    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
 972    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
 973    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_FOG], 0.0, 0.0, 0.0, 0.0 );
 974    ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX][0] = 1.0;
 975    ctx->Current.EdgeFlag = GL_TRUE;
 976 }
 977
 978
 979 /**
 980  * Init vertex/fragment program native limits from logical limits.
 981  */
 982 static void
 983 init_natives(struct gl_program_constants *prog)
 984 {
 985    prog->MaxNativeInstructions = prog->MaxInstructions;
 986    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 987    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 988    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 989    prog->MaxNativeAttribs = prog->MaxAttribs;
 990    prog->MaxNativeTemps = prog->MaxTemps;
 991    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 992    prog->MaxNativeParameters = prog->MaxParameters;
 993 }
 994
 995
 996 /**
 997  * Initialize fields of gl_constants (aka ctx->Const.*).
 998  * Use defaults from config.h.  The device drivers will often override
 999  * some of these values (such as number of texture units).
1000  */
1001 static void
1002 _mesa_init_constants( GLcontext *ctx )
1003 {
1004    assert(ctx);
1005
1006    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
1007    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
1008
1009    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_COORD_UNITS);
1010    assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_IMAGE_UNITS);
1011
1012    /* Constants, may be overriden (usually only reduced) by device drivers */
1013    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
1014    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
1015    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
1016    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
1017    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
1018    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
1019    ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
1020                                      ctx->Const.MaxTextureImageUnits);
1021    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
1022    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
1023    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
1024    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
1025    ctx->Const.MinPointSize = MIN_POINT_SIZE;
1026    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
1027    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
1028    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
1029    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
1030    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
1031    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
1032    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
1033    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
1034    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
1035    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
1036    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
1037    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
1038    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
1039    ctx->Const.MaxLights = MAX_LIGHTS;
1040    ctx->Const.MaxShininess = 128.0;
1041    ctx->Const.MaxSpotExponent = 128.0;
1042    ctx->Const.MaxViewportWidth = MAX_WIDTH;
1043    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
1044 #if FEATURE_ARB_vertex_program
1045    ctx->Const.VertexProgram.MaxInstructions = MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS;
1046    ctx->Const.VertexProgram.MaxAluInstructions = 0;
1047    ctx->Const.VertexProgram.MaxTexInstructions = 0;
1048    ctx->Const.VertexProgram.MaxTexIndirections = 0;
1049    ctx->Const.VertexProgram.MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
1050    ctx->Const.VertexProgram.MaxTemps = MAX_NV_VERTEX_PROGRAM_TEMPS;
1051    ctx->Const.VertexProgram.MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;
1052    ctx->Const.VertexProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
1053    ctx->Const.VertexProgram.MaxEnvParams = MAX_NV_VERTEX_PROGRAM_PARAMS;
1054    ctx->Const.VertexProgram.MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
1055    ctx->Const.VertexProgram.MaxUniformComponents = MAX_VERTEX_UNIFORM_COMPONENTS;
1056    init_natives(&ctx->Const.VertexProgram);
1057 #endif
1058 #if FEATURE_ARB_fragment_program
1059    ctx->Const.FragmentProgram.MaxInstructions = MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS;
1060    ctx->Const.FragmentProgram.MaxAluInstructions = MAX_FRAGMENT_PROGRAM_ALU_INSTRUCTIONS;
1061    ctx->Const.FragmentProgram.MaxTexInstructions = MAX_FRAGMENT_PROGRAM_TEX_INSTRUCTIONS;
1062    ctx->Const.FragmentProgram.MaxTexIndirections = MAX_FRAGMENT_PROGRAM_TEX_INDIRECTIONS;
1063    ctx->Const.FragmentProgram.MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
1064    ctx->Const.FragmentProgram.MaxTemps = MAX_NV_FRAGMENT_PROGRAM_TEMPS;
1065    ctx->Const.FragmentProgram.MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1066    ctx->Const.FragmentProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
1067    ctx->Const.FragmentProgram.MaxEnvParams = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1068    ctx->Const.FragmentProgram.MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
1069    ctx->Const.FragmentProgram.MaxUniformComponents = MAX_FRAGMENT_UNIFORM_COMPONENTS;
1070    init_natives(&ctx->Const.FragmentProgram);
1071 #endif
1072    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
1073    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
1074
1075    /* If we're running in the X server, do bounds checking to prevent
1076     * segfaults and server crashes!
1077     */
1078 #if defined(XFree86LOADER) && defined(IN_MODULE)
1079    ctx->Const.CheckArrayBounds = GL_TRUE;
1080 #else
1081    ctx->Const.CheckArrayBounds = GL_FALSE;
1082 #endif
1083
1084    /* GL_ARB_draw_buffers */
1085    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
1086
1087    /* GL_OES_read_format */
1088    ctx->Const.ColorReadFormat = GL_RGBA;
1089    ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
1090
1091 #if FEATURE_EXT_framebuffer_object
1092    ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
1093    ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
1094 #endif
1095
1096 #if FEATURE_ARB_vertex_shader
1097    ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
1098    ctx->Const.MaxVaryingFloats = MAX_VARYING_FLOATS;
1099 #endif
1100
1101    /* sanity checks */
1102    ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
1103                                              ctx->Const.MaxTextureCoordUnits));
1104    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
1105    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
1106 }
1107
1108
1109 /**
1110  * Do some sanity checks on the limits/constants for the given context.
1111  * Only called the first time a context is bound.
1112  */
1113 static void
1114 check_context_limits(GLcontext *ctx)
1115 {
1116    /* Many context limits/constants are limited by the size of
1117     * internal arrays.
1118     */
1119    assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
1120    assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
1121    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
1122    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
1123
1124    assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
1125    assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
1126
1127    /* make sure largest texture image is <= MAX_WIDTH in size */
1128    assert((1 << (ctx->Const.MaxTextureLevels -1 )) <= MAX_WIDTH);
1129    assert((1 << (ctx->Const.MaxCubeTextureLevels -1 )) <= MAX_WIDTH);
1130    assert((1 << (ctx->Const.Max3DTextureLevels -1 )) <= MAX_WIDTH);
1131
1132    assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
1133
1134    /* XXX probably add more tests */
1135 }
1136
1137
1138 /**
1139  * Initialize the attribute groups in a GL context.
1140  *
1141  * \param ctx GL context.
1142  *
1143  * Initializes all the attributes, calling the respective <tt>init*</tt>
1144  * functions for the more complex data structures.
1145  */
1146 static GLboolean
1147 init_attrib_groups( GLcontext *ctx )
1148 {
1149    assert(ctx);
1150
1151    /* Constants */
1152    _mesa_init_constants( ctx );
1153
1154    /* Extensions */
1155    _mesa_init_extensions( ctx );
1156
1157    /* Attribute Groups */
1158    _mesa_init_accum( ctx );
1159    _mesa_init_attrib( ctx );
1160    _mesa_init_buffer_objects( ctx );
1161    _mesa_init_color( ctx );
1162    _mesa_init_colortables( ctx );
1163    _mesa_init_current( ctx );
1164    _mesa_init_depth( ctx );
1165    _mesa_init_debug( ctx );
1166    _mesa_init_display_list( ctx );
1167    _mesa_init_eval( ctx );
1168    _mesa_init_feedback( ctx );
1169    _mesa_init_fog( ctx );
1170    _mesa_init_histogram( ctx );
1171    _mesa_init_hint( ctx );
1172    _mesa_init_line( ctx );
1173    _mesa_init_lighting( ctx );
1174    _mesa_init_matrix( ctx );
1175    _mesa_init_multisample( ctx );
1176    _mesa_init_pixel( ctx );
1177    _mesa_init_point( ctx );
1178    _mesa_init_polygon( ctx );
1179    _mesa_init_program( ctx );
1180    _mesa_init_query( ctx );
1181    _mesa_init_rastpos( ctx );
1182    _mesa_init_scissor( ctx );
1183    _mesa_init_shaderobjects (ctx);
1184    _mesa_init_stencil( ctx );
1185    _mesa_init_transform( ctx );
1186    _mesa_init_varray( ctx );
1187    _mesa_init_viewport( ctx );
1188
1189    if (!_mesa_init_texture( ctx ))
1190       return GL_FALSE;
1191
1192    _mesa_init_texture_s3tc( ctx );
1193    _mesa_init_texture_fxt1( ctx );
1194
1195    /* Miscellaneous */
1196    ctx->NewState = _NEW_ALL;
1197    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
1198    ctx->_Facing = 0;
1199
1200    return GL_TRUE;
1201 }
1202
1203
1204 /**
1205  * This is the default function we plug into all dispatch table slots
1206  * This helps prevents a segfault when someone calls a GL function without
1207  * first checking if the extension's supported.
1208  */
1209 static int
1210 generic_nop(void)
1211 {
1212    _mesa_problem(NULL, "User called no-op dispatch function (an unsupported extension function?)");
1213    return 0;
1214 }
1215
1216
1217 /**
1218  * Allocate and initialize a new dispatch table.
1219  */
1220 static struct _glapi_table *
1221 alloc_dispatch_table(void)
1222 {
1223    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1224     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
1225     * Mesa we do this to accomodate different versions of libGL and various
1226     * DRI drivers.
1227     */
1228    GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
1229                            sizeof(struct _glapi_table) / sizeof(_glapi_proc));
1230    struct _glapi_table *table =
1231       (struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
1232    if (table) {
1233       _glapi_proc *entry = (_glapi_proc *) table;
1234       GLint i;
1235       for (i = 0; i < numEntries; i++) {
1236          entry[i] = (_glapi_proc) generic_nop;
1237       }
1238    }
1239    return table;
1240 }
1241
1242
1243 /**
1244  * Initialize a GLcontext struct (rendering context).
1245  *
1246  * This includes allocating all the other structs and arrays which hang off of
1247  * the context by pointers.
1248  * Note that the driver needs to pass in its dd_function_table here since
1249  * we need to at least call driverFunctions->NewTextureObject to create the
1250  * default texture objects.
1251  *
1252  * Called by _mesa_create_context().
1253  *
1254  * Performs the imports and exports callback tables initialization, and
1255  * miscellaneous one-time initializations. If no shared context is supplied one
1256  * is allocated, and increase its reference count.  Setups the GL API dispatch
1257  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1258  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1259  * for debug flags.
1260  *
1261  * \param ctx the context to initialize
1262  * \param visual describes the visual attributes for this context
1263  * \param share_list points to context to share textures, display lists,
1264  *        etc with, or NULL
1265  * \param driverFunctions table of device driver functions for this context
1266  *        to use
1267  * \param driverContext pointer to driver-specific context data
1268  */
1269 GLboolean
1270 _mesa_initialize_context( GLcontext *ctx,
1271                           const GLvisual *visual,
1272                           GLcontext *share_list,
1273                           const struct dd_function_table *driverFunctions,
1274                           void *driverContext )
1275 {
1276    ASSERT(driverContext);
1277    assert(driverFunctions->NewTextureObject);
1278    assert(driverFunctions->FreeTexImageData);
1279
1280    /* If the driver wants core Mesa to use special imports, it'll have to
1281     * override these defaults.
1282     */
1283    _mesa_init_default_imports( &(ctx->imports), driverContext );
1284
1285    /* initialize the exports (Mesa functions called by the window system) */
1286    _mesa_init_default_exports( &(ctx->exports) );
1287
1288    /* misc one-time initializations */
1289    one_time_init(ctx);
1290
1291    ctx->Visual = *visual;
1292    ctx->DrawBuffer = NULL;
1293    ctx->ReadBuffer = NULL;
1294    ctx->WinSysDrawBuffer = NULL;
1295    ctx->WinSysReadBuffer = NULL;
1296
1297    /* Plug in driver functions and context pointer here.
1298     * This is important because when we call alloc_shared_state() below
1299     * we'll call ctx->Driver.NewTextureObject() to create the default
1300     * textures.
1301     */
1302    ctx->Driver = *driverFunctions;
1303    ctx->DriverCtx = driverContext;
1304
1305    if (share_list) {
1306       /* share state with another context */
1307       ctx->Shared = share_list->Shared;
1308    }
1309    else {
1310       /* allocate new, unshared state */
1311       if (!alloc_shared_state( ctx )) {
1312          return GL_FALSE;
1313       }
1314    }
1315    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1316    ctx->Shared->RefCount++;
1317    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1318
1319    if (!init_attrib_groups( ctx )) {
1320       free_shared_state(ctx, ctx->Shared);
1321       return GL_FALSE;
1322    }
1323
1324    /* setup the API dispatch tables */
1325    ctx->Exec = alloc_dispatch_table();
1326    ctx->Save = alloc_dispatch_table();
1327    if (!ctx->Exec || !ctx->Save) {
1328       free_shared_state(ctx, ctx->Shared);
1329       if (ctx->Exec)
1330          _mesa_free(ctx->Exec);
1331    }
1332    _mesa_init_exec_table(ctx->Exec);
1333    ctx->CurrentDispatch = ctx->Exec;
1334 #if _HAVE_FULL_GL
1335    _mesa_init_dlist_table(ctx->Save);
1336    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
1337    /* Neutral tnl module stuff */
1338    _mesa_init_exec_vtxfmt( ctx );
1339    ctx->TnlModule.Current = NULL;
1340    ctx->TnlModule.SwapCount = 0;
1341 #endif
1342
1343    ctx->_MaintainTexEnvProgram = (_mesa_getenv("MESA_TEX_PROG") != NULL);
1344    ctx->_UseTexEnvProgram = ctx->_MaintainTexEnvProgram;
1345
1346    ctx->_MaintainTnlProgram = (_mesa_getenv("MESA_TNL_PROG") != NULL);
1347    if (ctx->_MaintainTnlProgram)
1348       ctx->_MaintainTexEnvProgram = 1; /* this is required... */
1349
1350    ctx->FirstTimeCurrent = GL_TRUE;
1351
1352    return GL_TRUE;
1353 }
1354
1355
1356 /**
1357  * Allocate and initialize a GLcontext structure.
1358  * Note that the driver needs to pass in its dd_function_table here since
1359  * we need to at least call driverFunctions->NewTextureObject to initialize
1360  * the rendering context.
1361  *
1362  * \param visual a GLvisual pointer (we copy the struct contents)
1363  * \param share_list another context to share display lists with or NULL
1364  * \param driverFunctions points to the dd_function_table into which the
1365  *        driver has plugged in all its special functions.
1366  * \param driverCtx points to the device driver's private context state
1367  *
1368  * \return pointer to a new __GLcontextRec or NULL if error.
1369  */
1370 GLcontext *
1371 _mesa_create_context( const GLvisual *visual,
1372                       GLcontext *share_list,
1373                       const struct dd_function_table *driverFunctions,
1374                       void *driverContext )
1375
1376 {
1377    GLcontext *ctx;
1378
1379    ASSERT(visual);
1380    ASSERT(driverContext);
1381
1382    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
1383    if (!ctx)
1384       return NULL;
1385
1386    if (_mesa_initialize_context(ctx, visual, share_list,
1387                                 driverFunctions, driverContext)) {
1388       return ctx;
1389    }
1390    else {
1391       _mesa_free(ctx);
1392       return NULL;
1393    }
1394 }
1395
1396
1397 /**
1398  * Free the data associated with the given context.
1399  *
1400  * But doesn't free the GLcontext struct itself.
1401  *
1402  * \sa _mesa_initialize_context() and init_attrib_groups().
1403  */
1404 void
1405 _mesa_free_context_data( GLcontext *ctx )
1406 {
1407    /* if we're destroying the current context, unbind it first */
1408    if (ctx == _mesa_get_current_context()) {
1409       _mesa_make_current(NULL, NULL, NULL);
1410    }
1411
1412    _mesa_free_lighting_data( ctx );
1413    _mesa_free_eval_data( ctx );
1414    _mesa_free_texture_data( ctx );
1415    _mesa_free_matrix_data( ctx );
1416    _mesa_free_viewport_data( ctx );
1417    _mesa_free_colortables_data( ctx );
1418    _mesa_free_program_data(ctx);
1419    _mesa_free_query_data(ctx);
1420
1421 #if FEATURE_ARB_vertex_buffer_object
1422    _mesa_delete_buffer_object(ctx, ctx->Array.NullBufferObj);
1423 #endif
1424    _mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
1425
1426    /* free dispatch tables */
1427    _mesa_free(ctx->Exec);
1428    _mesa_free(ctx->Save);
1429
1430    /* Shared context state (display lists, textures, etc) */
1431    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1432    ctx->Shared->RefCount--;
1433    assert(ctx->Shared->RefCount >= 0);
1434    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1435    if (ctx->Shared->RefCount == 0) {
1436       /* free shared state */
1437       free_shared_state( ctx, ctx->Shared );
1438    }
1439
1440    if (ctx->Extensions.String)
1441       _mesa_free((void *) ctx->Extensions.String);
1442 }
1443
1444
1445 /**
1446  * Destroy a GLcontext structure.
1447  *
1448  * \param ctx GL context.
1449  *
1450  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1451  */
1452 void
1453 _mesa_destroy_context( GLcontext *ctx )
1454 {
1455    if (ctx) {
1456       _mesa_free_context_data(ctx);
1457       _mesa_free( (void *) ctx );
1458    }
1459 }
1460
1461
1462 #if _HAVE_FULL_GL
1463 /**
1464  * Copy attribute groups from one context to another.
1465  *
1466  * \param src source context
1467  * \param dst destination context
1468  * \param mask bitwise OR of GL_*_BIT flags
1469  *
1470  * According to the bits specified in \p mask, copies the corresponding
1471  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1472  * memcpy is not enough due to the existence of internal pointers in their data
1473  * structures.
1474  */
1475 void
1476 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1477 {
1478    if (mask & GL_ACCUM_BUFFER_BIT) {
1479       /* OK to memcpy */
1480       dst->Accum = src->Accum;
1481    }
1482    if (mask & GL_COLOR_BUFFER_BIT) {
1483       /* OK to memcpy */
1484       dst->Color = src->Color;
1485    }
1486    if (mask & GL_CURRENT_BIT) {
1487       /* OK to memcpy */
1488       dst->Current = src->Current;
1489    }
1490    if (mask & GL_DEPTH_BUFFER_BIT) {
1491       /* OK to memcpy */
1492       dst->Depth = src->Depth;
1493    }
1494    if (mask & GL_ENABLE_BIT) {
1495       /* no op */
1496    }
1497    if (mask & GL_EVAL_BIT) {
1498       /* OK to memcpy */
1499       dst->Eval = src->Eval;
1500    }
1501    if (mask & GL_FOG_BIT) {
1502       /* OK to memcpy */
1503       dst->Fog = src->Fog;
1504    }
1505    if (mask & GL_HINT_BIT) {
1506       /* OK to memcpy */
1507       dst->Hint = src->Hint;
1508    }
1509    if (mask & GL_LIGHTING_BIT) {
1510       GLuint i;
1511       /* begin with memcpy */
1512       dst->Light = src->Light;
1513       /* fixup linked lists to prevent pointer insanity */
1514       make_empty_list( &(dst->Light.EnabledList) );
1515       for (i = 0; i < MAX_LIGHTS; i++) {
1516          if (dst->Light.Light[i].Enabled) {
1517             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1518          }
1519       }
1520    }
1521    if (mask & GL_LINE_BIT) {
1522       /* OK to memcpy */
1523       dst->Line = src->Line;
1524    }
1525    if (mask & GL_LIST_BIT) {
1526       /* OK to memcpy */
1527       dst->List = src->List;
1528    }
1529    if (mask & GL_PIXEL_MODE_BIT) {
1530       /* OK to memcpy */
1531       dst->Pixel = src->Pixel;
1532    }
1533    if (mask & GL_POINT_BIT) {
1534       /* OK to memcpy */
1535       dst->Point = src->Point;
1536    }
1537    if (mask & GL_POLYGON_BIT) {
1538       /* OK to memcpy */
1539       dst->Polygon = src->Polygon;
1540    }
1541    if (mask & GL_POLYGON_STIPPLE_BIT) {
1542       /* Use loop instead of MEMCPY due to problem with Portland Group's
1543        * C compiler.  Reported by John Stone.
1544        */
1545       GLuint i;
1546       for (i = 0; i < 32; i++) {
1547          dst->PolygonStipple[i] = src->PolygonStipple[i];
1548       }
1549    }
1550    if (mask & GL_SCISSOR_BIT) {
1551       /* OK to memcpy */
1552       dst->Scissor = src->Scissor;
1553    }
1554    if (mask & GL_STENCIL_BUFFER_BIT) {
1555       /* OK to memcpy */
1556       dst->Stencil = src->Stencil;
1557    }
1558    if (mask & GL_TEXTURE_BIT) {
1559       /* Cannot memcpy because of pointers */
1560       _mesa_copy_texture_state(src, dst);
1561    }
1562    if (mask & GL_TRANSFORM_BIT) {
1563       /* OK to memcpy */
1564       dst->Transform = src->Transform;
1565    }
1566    if (mask & GL_VIEWPORT_BIT) {
1567       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1568       dst->Viewport.X = src->Viewport.X;
1569       dst->Viewport.Y = src->Viewport.Y;
1570       dst->Viewport.Width = src->Viewport.Width;
1571       dst->Viewport.Height = src->Viewport.Height;
1572       dst->Viewport.Near = src->Viewport.Near;
1573       dst->Viewport.Far = src->Viewport.Far;
1574       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1575    }
1576
1577    /* XXX FIXME:  Call callbacks?
1578     */
1579    dst->NewState = _NEW_ALL;
1580 }
1581 #endif
1582
1583
1584 /**
1585  * Check if the given context can render into the given framebuffer
1586  * by checking visual attributes.
1587  *
1588  * XXX this may go away someday because we're moving toward more freedom
1589  * in binding contexts to drawables with different visual attributes.
1590  * The GL_EXT_f_b_o extension is prompting some of that.
1591  *
1592  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1593  */
1594 static GLboolean
1595 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1596 {
1597    const GLvisual *ctxvis = &ctx->Visual;
1598    const GLvisual *bufvis = &buffer->Visual;
1599
1600    if (ctxvis == bufvis)
1601       return GL_TRUE;
1602
1603    if (ctxvis->rgbMode != bufvis->rgbMode)
1604       return GL_FALSE;
1605 #if 0
1606    /* disabling this fixes the fgl_glxgears pbuffer demo */
1607    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1608       return GL_FALSE;
1609 #endif
1610    if (ctxvis->stereoMode && !bufvis->stereoMode)
1611       return GL_FALSE;
1612    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1613       return GL_FALSE;
1614    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1615       return GL_FALSE;
1616    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1617       return GL_FALSE;
1618    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1619       return GL_FALSE;
1620    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1621       return GL_FALSE;
1622    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1623       return GL_FALSE;
1624    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1625       return GL_FALSE;
1626    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1627       return GL_FALSE;
1628
1629    return GL_TRUE;
1630 }
1631
1632
1633 /**
1634  * Do one-time initialization for the given framebuffer.  Specifically,
1635  * ask the driver for the window's current size and update the framebuffer
1636  * object to match.
1637  * Really, the device driver should totally take care of this.
1638  */
1639 static void
1640 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
1641 {
1642    GLuint width, height;
1643    if (ctx->Driver.GetBufferSize) {
1644       ctx->Driver.GetBufferSize(fb, &width, &height);
1645       if (ctx->Driver.ResizeBuffers)
1646          ctx->Driver.ResizeBuffers(ctx, fb, width, height);
1647       fb->Initialized = GL_TRUE;
1648    }
1649 }
1650
1651
1652 /**
1653  * Bind the given context to the given drawBuffer and readBuffer and
1654  * make it the current context for the calling thread.
1655  * We'll render into the drawBuffer and read pixels from the
1656  * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1657  *
1658  * We check that the context's and framebuffer's visuals are compatible
1659  * and return immediately if they're not.
1660  *
1661  * \param newCtx  the new GL context. If NULL then there will be no current GL
1662  *                context.
1663  * \param drawBuffer  the drawing framebuffer
1664  * \param readBuffer  the reading framebuffer
1665  */
1666 void
1667 _mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
1668                     GLframebuffer *readBuffer )
1669 {
1670    if (MESA_VERBOSE & VERBOSE_API)
1671       _mesa_debug(newCtx, "_mesa_make_current()\n");
1672
1673    /* Check that the context's and framebuffer's visuals are compatible.
1674     */
1675    if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
1676       if (!check_compatible(newCtx, drawBuffer)) {
1677          _mesa_warning(newCtx,
1678               "MakeCurrent: incompatible visuals for context and drawbuffer");
1679          return;
1680       }
1681    }
1682    if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
1683       if (!check_compatible(newCtx, readBuffer)) {
1684          _mesa_warning(newCtx,
1685               "MakeCurrent: incompatible visuals for context and readbuffer");
1686          return;
1687       }
1688    }
1689
1690    /* We used to call _glapi_check_multithread() here.  Now do it in drivers */
1691    _glapi_set_context((void *) newCtx);
1692    ASSERT(_mesa_get_current_context() == newCtx);
1693
1694    if (!newCtx) {
1695       _glapi_set_dispatch(NULL);  /* none current */
1696    }
1697    else {
1698       _glapi_set_dispatch(newCtx->CurrentDispatch);
1699
1700       if (drawBuffer && readBuffer) {
1701          /* TODO: check if newCtx and buffer's visual match??? */
1702
1703          ASSERT(drawBuffer->Name == 0);
1704          ASSERT(readBuffer->Name == 0);
1705          newCtx->WinSysDrawBuffer = drawBuffer;
1706          newCtx->WinSysReadBuffer = readBuffer;
1707
1708          /*
1709           * Only set the context's Draw/ReadBuffer fields if they're NULL
1710           * or not bound to a user-created FBO.
1711           */
1712          if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
1713             newCtx->DrawBuffer = drawBuffer;
1714          }
1715          if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
1716             newCtx->ReadBuffer = readBuffer;
1717          }
1718
1719          newCtx->NewState |= _NEW_BUFFERS;
1720
1721 #if 1
1722          /* We want to get rid of these lines: */
1723
1724 #if _HAVE_FULL_GL
1725          if (!drawBuffer->Initialized) {
1726             initialize_framebuffer_size(newCtx, drawBuffer);
1727          }
1728          if (readBuffer != drawBuffer && !readBuffer->Initialized) {
1729             initialize_framebuffer_size(newCtx, readBuffer);
1730          }
1731
1732          _mesa_resizebuffers(newCtx);
1733 #endif
1734
1735 #else
1736          /* We want the drawBuffer and readBuffer to be initialized by
1737           * the driver.
1738           * This generally means the Width and Height match the actual
1739           * window size and the renderbuffers (both hardware and software
1740           * based) are allocated to match.  The later can generally be
1741           * done with a call to _mesa_resize_framebuffer().
1742           *
1743           * It's theoretically possible for a buffer to have zero width
1744           * or height, but for now, assert check that the driver did what's
1745           * expected of it.
1746           */
1747          ASSERT(drawBuffer->Width > 0);
1748          ASSERT(drawBuffer->Height > 0);
1749 #endif
1750
1751          if (newCtx->FirstTimeCurrent) {
1752             /* set initial viewport and scissor size now */
1753             _mesa_set_viewport(newCtx, 0, 0,
1754                                drawBuffer->Width, drawBuffer->Height);
1755             _mesa_set_scissor(newCtx, 0, 0,
1756                               drawBuffer->Width, drawBuffer->Height );
1757             check_context_limits(newCtx);
1758          }
1759       }
1760
1761       /* We can use this to help debug user's problems.  Tell them to set
1762        * the MESA_INFO env variable before running their app.  Then the
1763        * first time each context is made current we'll print some useful
1764        * information.
1765        */
1766       if (newCtx->FirstTimeCurrent) {
1767          if (_mesa_getenv("MESA_INFO")) {
1768             _mesa_print_info();
1769          }
1770          newCtx->FirstTimeCurrent = GL_FALSE;
1771       }
1772    }
1773 }
1774
1775
1776 /**
1777  * Make context 'ctx' share the display lists, textures and programs
1778  * that are associated with 'ctxToShare'.
1779  * Any display lists, textures or programs associated with 'ctx' will
1780  * be deleted if nobody else is sharing them.
1781  */
1782 GLboolean
1783 _mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
1784 {
1785    if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
1786       ctx->Shared->RefCount--;
1787       if (ctx->Shared->RefCount == 0) {
1788          free_shared_state(ctx, ctx->Shared);
1789       }
1790       ctx->Shared = ctxToShare->Shared;
1791       ctx->Shared->RefCount++;
1792       return GL_TRUE;
1793    }
1794    else {
1795       return GL_FALSE;
1796    }
1797 }
1798
1799
1800
1801 /**
1802  * Get current context for the calling thread.
1803  *
1804  * \return pointer to the current GL context.
1805  *
1806  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1807  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in context.h.
1808  */
1809 GLcontext *
1810 _mesa_get_current_context( void )
1811 {
1812    return (GLcontext *) _glapi_get_context();
1813 }
1814
1815 /**
1816  * Get context's current API dispatch table.
1817  *
1818  * It'll either be the immediate-mode execute dispatcher or the display list
1819  * compile dispatcher.
1820  *
1821  * \param ctx GL context.
1822  *
1823  * \return pointer to dispatch_table.
1824  *
1825  * Simply returns __GLcontextRec::CurrentDispatch.
1826  */
1827 struct _glapi_table *
1828 _mesa_get_dispatch(GLcontext *ctx)
1829 {
1830    return ctx->CurrentDispatch;
1831 }
1832
1833 /*@}*/
1834
1835
1836 /**********************************************************************/
1837 /** \name Miscellaneous functions                                     */
1838 /**********************************************************************/
1839 /*@{*/
1840
1841 /**
1842  * Record an error.
1843  *
1844  * \param ctx GL context.
1845  * \param error error code.
1846  *
1847  * Records the given error code and call the driver's dd_function_table::Error
1848  * function if defined.
1849  *
1850  * \sa
1851  * This is called via _mesa_error().
1852  */
1853 void
1854 _mesa_record_error( GLcontext *ctx, GLenum error )
1855 {
1856    if (!ctx)
1857       return;
1858
1859    if (ctx->ErrorValue == GL_NO_ERROR) {
1860       ctx->ErrorValue = error;
1861    }
1862
1863    /* Call device driver's error handler, if any.  This is used on the Mac. */
1864    if (ctx->Driver.Error) {
1865       (*ctx->Driver.Error)( ctx );
1866    }
1867 }
1868
1869 /**
1870  * Execute glFinish().
1871  *
1872  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1873  * dd_function_table::Finish driver callback, if not NULL.
1874  */
1875 void GLAPIENTRY
1876 _mesa_Finish( void )
1877 {
1878    GET_CURRENT_CONTEXT(ctx);
1879    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1880    if (ctx->Driver.Finish) {
1881       (*ctx->Driver.Finish)( ctx );
1882    }
1883 }
1884
1885 /**
1886  * Execute glFlush().
1887  *
1888  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1889  * dd_function_table::Flush driver callback, if not NULL.
1890  */
1891 void GLAPIENTRY
1892 _mesa_Flush( void )
1893 {
1894    GET_CURRENT_CONTEXT(ctx);
1895    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1896    if (ctx->Driver.Flush) {
1897       (*ctx->Driver.Flush)( ctx );
1898    }
1899 }
1900
1901
1902 /*@}*/