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:  6.1
  10  *
  11  * Copyright (C) 1999-2004  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 "attrib.h"
  83 #include "blend.h"
  84 #include "buffers.h"
  85 #include "bufferobj.h"
  86 #include "colortab.h"
  87 #include "context.h"
  88 #include "debug.h"
  89 #include "depth.h"
  90 #include "dlist.h"
  91 #include "eval.h"
  92 #include "enums.h"
  93 #include "extensions.h"
  94 #include "feedback.h"
  95 #include "fog.h"
  96 #include "get.h"
  97 #include "glthread.h"
  98 #include "glapioffsets.h"
  99 #include "histogram.h"
 100 #include "hint.h"
 101 #include "hash.h"
 102 #include "light.h"
 103 #include "lines.h"
 104 #include "macros.h"
 105 #include "matrix.h"
 106 #include "occlude.h"
 107 #include "pixel.h"
 108 #include "points.h"
 109 #include "polygon.h"
 110 #if FEATURE_NV_vertex_program || FEATURE_NV_fragment_program
 111 #include "program.h"
 112 #endif
 113 #include "rastpos.h"
 114 #include "simple_list.h"
 115 #include "state.h"
 116 #include "stencil.h"
 117 #include "texcompress.h"
 118 #include "teximage.h"
 119 #include "texobj.h"
 120 #include "texstate.h"
 121 #include "mtypes.h"
 122 #include "varray.h"
 123 #include "vtxfmt.h"
 124 #if _HAVE_FULL_GL
 125 #include "math/m_translate.h"
 126 #include "math/m_matrix.h"
 127 #include "math/m_xform.h"
 128 #include "math/mathmod.h"
 129 #endif
 130
 131 #ifdef USE_SPARC_ASM
 132 #include "sparc/sparc.h"
 133 #endif
 134
 135 #ifndef MESA_VERBOSE
 136 int MESA_VERBOSE = 0;
 137 #endif
 138
 139 #ifndef MESA_DEBUG_FLAGS
 140 int MESA_DEBUG_FLAGS = 0;
 141 #endif
 142
 143
 144 /* ubyte -> float conversion */
 145 GLfloat _mesa_ubyte_to_float_color_tab[256];
 146
 147 static void
 148 free_shared_state( GLcontext *ctx, struct gl_shared_state *ss );
 149
 150
 151 /**********************************************************************/
 152 /** \name OpenGL SI-style interface (new in Mesa 3.5)
 153  *
 154  * \if subset
 155  * \note Most of these functions are never called in the Mesa subset.
 156  * \endif
 157  */
 158 /*@{*/
 159
 160 /**
 161  * Destroy context callback.
 162  *
 163  * \param gc context.
 164  * \return GL_TRUE on success, or GL_FALSE on failure.
 165  *
 166  * \ifnot subset
 167  * Called by window system/device driver (via __GLexports::destroyCurrent) when
 168  * the rendering context is to be destroyed.
 169  * \endif
 170  *
 171  * Frees the context data and the context structure.
 172  */
 173 GLboolean
 174 _mesa_destroyContext(__GLcontext *gc)
 175 {
 176    if (gc) {
 177       _mesa_free_context_data(gc);
 178       _mesa_free(gc);
 179    }
 180    return GL_TRUE;
 181 }
 182
 183 /**
 184  * Unbind context callback.
 185  *
 186  * \param gc context.
 187  * \return GL_TRUE on success, or GL_FALSE on failure.
 188  *
 189  * \ifnot subset
 190  * Called by window system/device driver (via __GLexports::loseCurrent)
 191  * when the rendering context is made non-current.
 192  * \endif
 193  *
 194  * No-op
 195  */
 196 GLboolean
 197 _mesa_loseCurrent(__GLcontext *gc)
 198 {
 199    /* XXX unbind context from thread */
 200    (void) gc;
 201    return GL_TRUE;
 202 }
 203
 204 /**
 205  * Bind context callback.
 206  *
 207  * \param gc context.
 208  * \return GL_TRUE on success, or GL_FALSE on failure.
 209  *
 210  * \ifnot subset
 211  * Called by window system/device driver (via __GLexports::makeCurrent)
 212  * when the rendering context is made current.
 213  * \endif
 214  *
 215  * No-op
 216  */
 217 GLboolean
 218 _mesa_makeCurrent(__GLcontext *gc)
 219 {
 220    /* XXX bind context to thread */
 221    (void) gc;
 222    return GL_TRUE;
 223 }
 224
 225 /**
 226  * Share context callback.
 227  *
 228  * \param gc context.
 229  * \param gcShare shared context.
 230  * \return GL_TRUE on success, or GL_FALSE on failure.
 231  *
 232  * \ifnot subset
 233  * Called by window system/device driver (via __GLexports::shareContext)
 234  * \endif
 235  *
 236  * Update the shared context reference count, gl_shared_state::RefCount.
 237  */
 238 GLboolean
 239 _mesa_shareContext(__GLcontext *gc, __GLcontext *gcShare)
 240 {
 241    if (gc && gcShare && gc->Shared && gcShare->Shared) {
 242       gc->Shared->RefCount--;
 243       if (gc->Shared->RefCount == 0) {
 244          free_shared_state(gc, gc->Shared);
 245       }
 246       gc->Shared = gcShare->Shared;
 247       gc->Shared->RefCount++;
 248       return GL_TRUE;
 249    }
 250    else {
 251       return GL_FALSE;
 252    }
 253 }
 254
 255
 256 #if _HAVE_FULL_GL
 257 /**
 258  * Copy context callback.
 259  */
 260 GLboolean
 261 _mesa_copyContext(__GLcontext *dst, const __GLcontext *src, GLuint mask)
 262 {
 263    if (dst && src) {
 264       _mesa_copy_context( src, dst, mask );
 265       return GL_TRUE;
 266    }
 267    else {
 268       return GL_FALSE;
 269    }
 270 }
 271 #endif
 272
 273 /** No-op */
 274 GLboolean
 275 _mesa_forceCurrent(__GLcontext *gc)
 276 {
 277    (void) gc;
 278    return GL_TRUE;
 279 }
 280
 281 /**
 282  * Windows/buffer resizing notification callback.
 283  *
 284  * \param gc GL context.
 285  * \return GL_TRUE on success, or GL_FALSE on failure.
 286  */
 287 GLboolean
 288 _mesa_notifyResize(__GLcontext *gc)
 289 {
 290    GLint x, y;
 291    GLuint width, height;
 292    __GLdrawablePrivate *d = gc->imports.getDrawablePrivate(gc);
 293    if (!d || !d->getDrawableSize)
 294       return GL_FALSE;
 295    d->getDrawableSize( d, &x, &y, &width, &height );
 296    /* update viewport, resize software buffers, etc. */
 297    return GL_TRUE;
 298 }
 299
 300 /**
 301  * Window/buffer destruction notification callback.
 302  *
 303  * \param gc GL context.
 304  *
 305  * Called when the context's window/buffer is going to be destroyed.
 306  *
 307  * No-op
 308  */
 309 void
 310 _mesa_notifyDestroy(__GLcontext *gc)
 311 {
 312    /* Unbind from it. */
 313    (void) gc;
 314 }
 315
 316 /**
 317  * Swap buffers notification callback.
 318  *
 319  * \param gc GL context.
 320  *
 321  * Called by window system just before swapping buffers.
 322  * We have to finish any pending rendering.
 323  */
 324 void
 325 _mesa_notifySwapBuffers(__GLcontext *gc)
 326 {
 327    FLUSH_VERTICES( gc, 0 );
 328 }
 329
 330 /** No-op */
 331 struct __GLdispatchStateRec *
 332 _mesa_dispatchExec(__GLcontext *gc)
 333 {
 334    (void) gc;
 335    return NULL;
 336 }
 337
 338 /** No-op */
 339 void
 340 _mesa_beginDispatchOverride(__GLcontext *gc)
 341 {
 342    (void) gc;
 343 }
 344
 345 /** No-op */
 346 void
 347 _mesa_endDispatchOverride(__GLcontext *gc)
 348 {
 349    (void) gc;
 350 }
 351
 352 /**
 353  * \ifnot subset
 354  * Setup the exports.
 355  *
 356  * The window system will call these functions when it needs Mesa to do
 357  * something.
 358  *
 359  * \note Device drivers should override these functions!  For example,
 360  * the Xlib driver should plug in the XMesa*-style functions into this
 361  * structure.  The XMesa-style functions should then call the _mesa_*
 362  * version of these functions.  This is an approximation to OO design
 363  * (inheritance and virtual functions).
 364  * \endif
 365  *
 366  * \if subset
 367  * No-op.
 368  *
 369  * \endif
 370  */
 371 static void
 372 _mesa_init_default_exports(__GLexports *exports)
 373 {
 374 #if _HAVE_FULL_GL
 375     exports->destroyContext = _mesa_destroyContext;
 376     exports->loseCurrent = _mesa_loseCurrent;
 377     exports->makeCurrent = _mesa_makeCurrent;
 378     exports->shareContext = _mesa_shareContext;
 379     exports->copyContext = _mesa_copyContext;
 380     exports->forceCurrent = _mesa_forceCurrent;
 381     exports->notifyResize = _mesa_notifyResize;
 382     exports->notifyDestroy = _mesa_notifyDestroy;
 383     exports->notifySwapBuffers = _mesa_notifySwapBuffers;
 384     exports->dispatchExec = _mesa_dispatchExec;
 385     exports->beginDispatchOverride = _mesa_beginDispatchOverride;
 386     exports->endDispatchOverride = _mesa_endDispatchOverride;
 387 #else
 388     (void) exports;
 389 #endif
 390 }
 391
 392 /**
 393  * Exported OpenGL SI interface.
 394  */
 395 __GLcontext *
 396 __glCoreCreateContext(__GLimports *imports, __GLcontextModes *modes)
 397 {
 398     GLcontext *ctx;
 399
 400     ctx = (GLcontext *) (*imports->calloc)(NULL, 1, sizeof(GLcontext));
 401     if (ctx == NULL) {
 402         return NULL;
 403     }
 404
 405     /* XXX doesn't work at this time */
 406     _mesa_initialize_context(ctx, modes, NULL, NULL, NULL);
 407     ctx->imports = *imports;
 408
 409     return ctx;
 410 }
 411
 412 /**
 413  * Exported OpenGL SI interface.
 414  */
 415 void
 416 __glCoreNopDispatch(void)
 417 {
 418 #if 0
 419    /* SI */
 420    __gl_dispatch = __glNopDispatchState;
 421 #else
 422    /* Mesa */
 423    _glapi_set_dispatch(NULL);
 424 #endif
 425 }
 426
 427 /*@}*/
 428
 429
 430 /**********************************************************************/
 431 /** \name GL Visual allocation/destruction                            */
 432 /**********************************************************************/
 433 /*@{*/
 434
 435 /**
 436  * Allocates a GLvisual structure and initializes it via
 437  * _mesa_initialize_visual().
 438  *
 439  * \param rgbFlag GL_TRUE for RGB(A) mode, GL_FALSE for Color Index mode.
 440  * \param dbFlag double buffering
 441  * \param stereoFlag stereo buffer
 442  * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
 443  * is acceptable but the actual depth type will be GLushort or GLuint as
 444  * needed.
 445  * \param stencilBits requested minimum bits per stencil buffer value
 446  * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.
 447  * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
 448  * \param redBits number of bits per color component in frame buffer for RGB(A)
 449  * mode.  We always use 8 in core Mesa though.
 450  * \param greenBits same as above.
 451  * \param blueBits same as above.
 452  * \param alphaBits same as above.
 453  * \param numSamples not really used.
 454  *
 455  * \return pointer to new GLvisual or NULL if requested parameters can't be
 456  * met.
 457  *
 458  * \note Need to add params for level and numAuxBuffers (at least)
 459  */
 460 GLvisual *
 461 _mesa_create_visual( GLboolean rgbFlag,
 462                      GLboolean dbFlag,
 463                      GLboolean stereoFlag,
 464                      GLint redBits,
 465                      GLint greenBits,
 466                      GLint blueBits,
 467                      GLint alphaBits,
 468                      GLint indexBits,
 469                      GLint depthBits,
 470                      GLint stencilBits,
 471                      GLint accumRedBits,
 472                      GLint accumGreenBits,
 473                      GLint accumBlueBits,
 474                      GLint accumAlphaBits,
 475                      GLint numSamples )
 476 {
 477    GLvisual *vis = (GLvisual *) CALLOC( sizeof(GLvisual) );
 478    if (vis) {
 479       if (!_mesa_initialize_visual(vis, rgbFlag, dbFlag, stereoFlag,
 480                                    redBits, greenBits, blueBits, alphaBits,
 481                                    indexBits, depthBits, stencilBits,
 482                                    accumRedBits, accumGreenBits,
 483                                    accumBlueBits, accumAlphaBits,
 484                                    numSamples)) {
 485          FREE(vis);
 486          return NULL;
 487       }
 488    }
 489    return vis;
 490 }
 491
 492 /**
 493  * Makes some sanity checks and fills in the fields of the
 494  * GLvisual structure with the given parameters.
 495  *
 496  * \return GL_TRUE on success, or GL_FALSE on failure.
 497  *
 498  * \sa _mesa_create_visual() above for the parameter description.
 499  *
 500  * \note Need to add params for level and numAuxBuffers (at least)
 501  */
 502 GLboolean
 503 _mesa_initialize_visual( GLvisual *vis,
 504                          GLboolean rgbFlag,
 505                          GLboolean dbFlag,
 506                          GLboolean stereoFlag,
 507                          GLint redBits,
 508                          GLint greenBits,
 509                          GLint blueBits,
 510                          GLint alphaBits,
 511                          GLint indexBits,
 512                          GLint depthBits,
 513                          GLint stencilBits,
 514                          GLint accumRedBits,
 515                          GLint accumGreenBits,
 516                          GLint accumBlueBits,
 517                          GLint accumAlphaBits,
 518                          GLint numSamples )
 519 {
 520    assert(vis);
 521
 522    /* This is to catch bad values from device drivers not updated for
 523     * Mesa 3.3.  Some device drivers just passed 1.  That's a REALLY
 524     * bad value now (a 1-bit depth buffer!?!).
 525     */
 526    assert(depthBits == 0 || depthBits > 1);
 527
 528    if (depthBits < 0 || depthBits > 32) {
 529       return GL_FALSE;
 530    }
 531    if (stencilBits < 0 || stencilBits > (GLint) (8 * sizeof(GLstencil))) {
 532       return GL_FALSE;
 533    }
 534    if (accumRedBits < 0 || accumRedBits > (GLint) (8 * sizeof(GLaccum))) {
 535       return GL_FALSE;
 536    }
 537    if (accumGreenBits < 0 || accumGreenBits > (GLint) (8 * sizeof(GLaccum))) {
 538       return GL_FALSE;
 539    }
 540    if (accumBlueBits < 0 || accumBlueBits > (GLint) (8 * sizeof(GLaccum))) {
 541       return GL_FALSE;
 542    }
 543    if (accumAlphaBits < 0 || accumAlphaBits > (GLint) (8 * sizeof(GLaccum))) {
 544       return GL_FALSE;
 545    }
 546
 547    vis->rgbMode          = rgbFlag;
 548    vis->doubleBufferMode = dbFlag;
 549    vis->stereoMode       = stereoFlag;
 550
 551    vis->redBits          = redBits;
 552    vis->greenBits        = greenBits;
 553    vis->blueBits         = blueBits;
 554    vis->alphaBits        = alphaBits;
 555
 556    vis->indexBits      = indexBits;
 557    vis->depthBits      = depthBits;
 558    vis->accumRedBits   = (accumRedBits > 0) ? (8 * sizeof(GLaccum)) : 0;
 559    vis->accumGreenBits = (accumGreenBits > 0) ? (8 * sizeof(GLaccum)) : 0;
 560    vis->accumBlueBits  = (accumBlueBits > 0) ? (8 * sizeof(GLaccum)) : 0;
 561    vis->accumAlphaBits = (accumAlphaBits > 0) ? (8 * sizeof(GLaccum)) : 0;
 562    vis->stencilBits    = (stencilBits > 0) ? (8 * sizeof(GLstencil)) : 0;
 563
 564    vis->haveAccumBuffer   = accumRedBits > 0;
 565    vis->haveDepthBuffer   = depthBits > 0;
 566    vis->haveStencilBuffer = stencilBits > 0;
 567
 568    vis->numAuxBuffers = 0;
 569    vis->level = 0;
 570    vis->pixmapMode = 0;
 571    vis->samples = numSamples;
 572
 573    return GL_TRUE;
 574 }
 575
 576
 577 /**
 578  * Destroy a visual and free its memory.
 579  *
 580  * \param vis visual.
 581  *
 582  * Frees the visual structure.
 583  */
 584 void
 585 _mesa_destroy_visual( GLvisual *vis )
 586 {
 587    FREE(vis);
 588 }
 589
 590 /*@}*/
 591
 592
 593 /**********************************************************************/
 594 /** \name GL Framebuffer allocation/destruction                       */
 595 /**********************************************************************/
 596 /*@{*/
 597
 598 /**
 599  * Allocate a GLframebuffer structure and initializes it via
 600  * _mesa_initialize_framebuffer().
 601  *
 602  * A GLframebuffer is a structure which encapsulates the depth, stencil and
 603  * accum buffers and related parameters.
 604  *
 605  * Note that the actual depth/stencil/accum/etc buffers are not allocated
 606  * at this time.  It's up to the device driver and/or swrast module to
 607  * allocate them as needed.
 608  *
 609  * \param visual a GLvisual pointer (we copy the struct contents)
 610  * \param softwareDepth create/use a software depth buffer?
 611  * \param softwareStencil create/use a software stencil buffer?
 612  * \param softwareAccum create/use a software accum buffer?
 613  * \param softwareAlpha create/use a software alpha buffer?
 614  *
 615  * \return pointer to new GLframebuffer struct or NULL if error.
 616  *
 617  * \note Need to add softwareAuxBuffers parameter.
 618  */
 619 GLframebuffer *
 620 _mesa_create_framebuffer( const GLvisual *visual,
 621                           GLboolean softwareDepth,
 622                           GLboolean softwareStencil,
 623                           GLboolean softwareAccum,
 624                           GLboolean softwareAlpha )
 625 {
 626    GLframebuffer *buffer = CALLOC_STRUCT(gl_frame_buffer);
 627    assert(visual);
 628    if (buffer) {
 629       _mesa_initialize_framebuffer(buffer, visual,
 630                                    softwareDepth, softwareStencil,
 631                                    softwareAccum, softwareAlpha );
 632    }
 633    return buffer;
 634 }
 635
 636
 637 /**
 638  * Makes some sanity checks and fills in the fields of the
 639  * GLframebuffer structure with the given parameters.
 640  *
 641  * \sa _mesa_create_framebuffer() above for the parameter description.
 642  */
 643 void
 644 _mesa_initialize_framebuffer( GLframebuffer *buffer,
 645                               const GLvisual *visual,
 646                               GLboolean softwareDepth,
 647                               GLboolean softwareStencil,
 648                               GLboolean softwareAccum,
 649                               GLboolean softwareAlpha )
 650 {
 651    GLboolean softwareAux = GL_FALSE;
 652    assert(buffer);
 653    assert(visual);
 654
 655    _mesa_bzero(buffer, sizeof(GLframebuffer));
 656
 657    /* sanity checks */
 658    if (softwareDepth ) {
 659       assert(visual->depthBits > 0);
 660    }
 661    if (softwareStencil) {
 662       assert(visual->stencilBits > 0);
 663    }
 664    if (softwareAccum) {
 665       assert(visual->rgbMode);
 666       assert(visual->accumRedBits > 0);
 667       assert(visual->accumGreenBits > 0);
 668       assert(visual->accumBlueBits > 0);
 669    }
 670    if (softwareAlpha) {
 671       assert(visual->rgbMode);
 672       assert(visual->alphaBits > 0);
 673    }
 674
 675    buffer->Visual = *visual;
 676    buffer->UseSoftwareDepthBuffer = softwareDepth;
 677    buffer->UseSoftwareStencilBuffer = softwareStencil;
 678    buffer->UseSoftwareAccumBuffer = softwareAccum;
 679    buffer->UseSoftwareAlphaBuffers = softwareAlpha;
 680    buffer->UseSoftwareAuxBuffers = softwareAux;
 681 }
 682
 683
 684 /**
 685  * Free a framebuffer struct and its buffers.
 686  *
 687  * Calls _mesa_free_framebuffer_data() and frees the structure.
 688  */
 689 void
 690 _mesa_destroy_framebuffer( GLframebuffer *buffer )
 691 {
 692    if (buffer) {
 693       _mesa_free_framebuffer_data(buffer);
 694       FREE(buffer);
 695    }
 696 }
 697
 698
 699 /**
 700  * Free the data hanging off of \p buffer, but not \p buffer itself.
 701  *
 702  * \param buffer framebuffer.
 703  *
 704  * Frees all the buffers associated with the structure.
 705  */
 706 void
 707 _mesa_free_framebuffer_data( GLframebuffer *buffer )
 708 {
 709    if (!buffer)
 710       return;
 711
 712    if (buffer->UseSoftwareDepthBuffer && buffer->DepthBuffer) {
 713       MESA_PBUFFER_FREE( buffer->DepthBuffer );
 714       buffer->DepthBuffer = NULL;
 715    }
 716    if (buffer->UseSoftwareAccumBuffer && buffer->Accum) {
 717       MESA_PBUFFER_FREE( buffer->Accum );
 718       buffer->Accum = NULL;
 719    }
 720    if (buffer->UseSoftwareStencilBuffer && buffer->Stencil) {
 721       MESA_PBUFFER_FREE( buffer->Stencil );
 722       buffer->Stencil = NULL;
 723    }
 724    if (buffer->UseSoftwareAlphaBuffers){
 725       if (buffer->FrontLeftAlpha) {
 726          MESA_PBUFFER_FREE( buffer->FrontLeftAlpha );
 727          buffer->FrontLeftAlpha = NULL;
 728       }
 729       if (buffer->BackLeftAlpha) {
 730          MESA_PBUFFER_FREE( buffer->BackLeftAlpha );
 731          buffer->BackLeftAlpha = NULL;
 732       }
 733       if (buffer->FrontRightAlpha) {
 734          MESA_PBUFFER_FREE( buffer->FrontRightAlpha );
 735          buffer->FrontRightAlpha = NULL;
 736       }
 737       if (buffer->BackRightAlpha) {
 738          MESA_PBUFFER_FREE( buffer->BackRightAlpha );
 739          buffer->BackRightAlpha = NULL;
 740       }
 741    }
 742 }
 743
 744 /*@}*/
 745
 746
 747 /**********************************************************************/
 748 /** \name Context allocation, initialization, destroying
 749  *
 750  * The purpose of the most initialization functions here is to provide the
 751  * default state values according to the OpenGL specification.
 752  */
 753 /**********************************************************************/
 754 /*@{*/
 755
 756 /**
 757  * One-time initialization mutex lock.
 758  *
 759  * \sa Used by one_time_init().
 760  */
 761 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
 762
 763 /**
 764  * Calls all the various one-time-init functions in Mesa.
 765  *
 766  * While holding a global mutex lock, calls several initialization functions,
 767  * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
 768  * defined.
 769  *
 770  * \sa _mesa_init_lists(), _math_init().
 771  */
 772 static void
 773 one_time_init( GLcontext *ctx )
 774 {
 775    static GLboolean alreadyCalled = GL_FALSE;
 776    (void) ctx;
 777    _glthread_LOCK_MUTEX(OneTimeLock);
 778    if (!alreadyCalled) {
 779       GLuint i;
 780
 781       /* do some implementation tests */
 782       assert( sizeof(GLbyte) == 1 );
 783       assert( sizeof(GLubyte) == 1 );
 784       assert( sizeof(GLshort) == 2 );
 785       assert( sizeof(GLushort) == 2 );
 786       assert( sizeof(GLint) == 4 );
 787       assert( sizeof(GLuint) == 4 );
 788
 789       _mesa_init_lists();
 790
 791 #if _HAVE_FULL_GL
 792       _math_init();
 793
 794       for (i = 0; i < 256; i++) {
 795          _mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
 796       }
 797 #endif
 798
 799 #ifdef USE_SPARC_ASM
 800       _mesa_init_sparc_glapi_relocs();
 801 #endif
 802       if (_mesa_getenv("MESA_DEBUG")) {
 803          _glapi_noop_enable_warnings(GL_TRUE);
 804 #ifndef GLX_DIRECT_RENDERING
 805          /* libGL from before 2002/06/28 don't have this function.  Someday,
 806           * when newer libGL libs are common, remove the #ifdef test.  This
 807           * only serves to print warnings when calling undefined GL functions.
 808           */
 809          _glapi_set_warning_func( (_glapi_warning_func) _mesa_warning );
 810 #endif
 811       }
 812       else {
 813          _glapi_noop_enable_warnings(GL_FALSE);
 814       }
 815
 816 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
 817       _mesa_debug(ctx, "Mesa DEBUG build %s %s\n", __DATE__, __TIME__);
 818 #endif
 819
 820       alreadyCalled = GL_TRUE;
 821    }
 822    _glthread_UNLOCK_MUTEX(OneTimeLock);
 823 }
 824
 825
 826 /**
 827  * Allocate and initialize a shared context state structure.
 828  * Initializes the display list, texture objects and vertex programs hash
 829  * tables, allocates the texture objects. If it runs out of memory, frees
 830  * everything already allocated before returning NULL.
 831  *
 832  * \return pointer to a gl_shared_state structure on success, or NULL on
 833  * failure.
 834  */
 835 static GLboolean
 836 alloc_shared_state( GLcontext *ctx )
 837 {
 838    struct gl_shared_state *ss = CALLOC_STRUCT(gl_shared_state);
 839    if (!ss)
 840       return GL_FALSE;
 841
 842    ctx->Shared = ss;
 843
 844    _glthread_INIT_MUTEX(ss->Mutex);
 845
 846    ss->DisplayList = _mesa_NewHashTable();
 847    ss->TexObjects = _mesa_NewHashTable();
 848 #if FEATURE_NV_vertex_program || FEATURE_NV_fragment_program
 849    ss->Programs = _mesa_NewHashTable();
 850 #endif
 851
 852 #if FEATURE_ARB_vertex_program
 853    ss->DefaultVertexProgram = ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
 854    if (!ss->DefaultVertexProgram)
 855       goto cleanup;
 856 #endif
 857 #if FEATURE_ARB_fragment_program
 858    ss->DefaultFragmentProgram = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 859    if (!ss->DefaultFragmentProgram)
 860       goto cleanup;
 861 #endif
 862
 863    ss->BufferObjects = _mesa_NewHashTable();
 864
 865    ss->Default1D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_1D);
 866    if (!ss->Default1D)
 867       goto cleanup;
 868
 869    ss->Default2D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_2D);
 870    if (!ss->Default2D)
 871       goto cleanup;
 872
 873    ss->Default3D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_3D);
 874    if (!ss->Default3D)
 875       goto cleanup;
 876
 877    ss->DefaultCubeMap = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_CUBE_MAP_ARB);
 878    if (!ss->DefaultCubeMap)
 879       goto cleanup;
 880
 881    ss->DefaultRect = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_RECTANGLE_NV);
 882    if (!ss->DefaultRect)
 883       goto cleanup;
 884
 885    /* Effectively bind the default textures to all texture units */
 886    ss->Default1D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 887    ss->Default2D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 888    ss->Default3D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 889    ss->DefaultCubeMap->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 890    ss->DefaultRect->RefCount += MAX_TEXTURE_IMAGE_UNITS;
 891
 892    return GL_TRUE;
 893
 894  cleanup:
 895    /* Ran out of memory at some point.  Free everything and return NULL */
 896    if (ss->DisplayList)
 897       _mesa_DeleteHashTable(ss->DisplayList);
 898    if (ss->TexObjects)
 899       _mesa_DeleteHashTable(ss->TexObjects);
 900 #if FEATURE_NV_vertex_program
 901    if (ss->Programs)
 902       _mesa_DeleteHashTable(ss->Programs);
 903 #endif
 904 #if FEATURE_ARB_vertex_program
 905    if (ss->DefaultVertexProgram)
 906       ctx->Driver.DeleteProgram(ctx, ss->DefaultVertexProgram);
 907 #endif
 908 #if FEATURE_ARB_fragment_program
 909    if (ss->DefaultFragmentProgram)
 910       ctx->Driver.DeleteProgram(ctx, ss->DefaultFragmentProgram);
 911 #endif
 912 #if FEATURE_ARB_vertex_buffer_object
 913    if (ss->BufferObjects)
 914       _mesa_DeleteHashTable(ss->BufferObjects);
 915 #endif
 916
 917    if (ss->Default1D)
 918       (*ctx->Driver.DeleteTexture)(ctx, ss->Default1D);
 919    if (ss->Default2D)
 920       (*ctx->Driver.DeleteTexture)(ctx, ss->Default2D);
 921    if (ss->Default3D)
 922       (*ctx->Driver.DeleteTexture)(ctx, ss->Default3D);
 923    if (ss->DefaultCubeMap)
 924       (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultCubeMap);
 925    if (ss->DefaultRect)
 926       (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultRect);
 927    if (ss)
 928       _mesa_free(ss);
 929    return GL_FALSE;
 930 }
 931
 932 /**
 933  * Deallocate a shared state context and all children structures.
 934  *
 935  * \param ctx GL context.
 936  * \param ss shared state pointer.
 937  *
 938  * Frees the display lists, the texture objects (calling the driver texture
 939  * deletion callback to free its private data) and the vertex programs, as well
 940  * as their hash tables.
 941  *
 942  * \sa alloc_shared_state().
 943  */
 944 static void
 945 free_shared_state( GLcontext *ctx, struct gl_shared_state *ss )
 946 {
 947    /* Free display lists */
 948    while (1) {
 949       GLuint list = _mesa_HashFirstEntry(ss->DisplayList);
 950       if (list) {
 951          _mesa_destroy_list(ctx, list);
 952       }
 953       else {
 954          break;
 955       }
 956    }
 957    _mesa_DeleteHashTable(ss->DisplayList);
 958
 959    /* Free texture objects */
 960    ASSERT(ctx->Driver.DeleteTexture);
 961    /* the default textures */
 962    (*ctx->Driver.DeleteTexture)(ctx, ss->Default1D);
 963    (*ctx->Driver.DeleteTexture)(ctx, ss->Default2D);
 964    (*ctx->Driver.DeleteTexture)(ctx, ss->Default3D);
 965    (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultCubeMap);
 966    (*ctx->Driver.DeleteTexture)(ctx, ss->DefaultRect);
 967    /* all other textures */
 968    while (1) {
 969       GLuint texName = _mesa_HashFirstEntry(ss->TexObjects);
 970       if (texName) {
 971          struct gl_texture_object *texObj = (struct gl_texture_object *)
 972             _mesa_HashLookup(ss->TexObjects, texName);
 973          ASSERT(texObj);
 974          (*ctx->Driver.DeleteTexture)(ctx, texObj);
 975          _mesa_HashRemove(ss->TexObjects, texName);
 976       }
 977       else {
 978          break;
 979       }
 980    }
 981    _mesa_DeleteHashTable(ss->TexObjects);
 982
 983 #if FEATURE_NV_vertex_program
 984    /* Free vertex programs */
 985    while (1) {
 986       GLuint prog = _mesa_HashFirstEntry(ss->Programs);
 987       if (prog) {
 988          struct program *p = (struct program *) _mesa_HashLookup(ss->Programs,
 989                                                                  prog);
 990          ASSERT(p);
 991          ctx->Driver.DeleteProgram(ctx, p);
 992          _mesa_HashRemove(ss->Programs, prog);
 993       }
 994       else {
 995          break;
 996       }
 997    }
 998    _mesa_DeleteHashTable(ss->Programs);
 999 #endif
1000 #if FEATURE_ARB_vertex_program
1001    _mesa_delete_program(ctx, ss->DefaultVertexProgram);
1002 #endif
1003 #if FEATURE_ARB_fragment_program
1004    _mesa_delete_program(ctx, ss->DefaultFragmentProgram);
1005 #endif
1006
1007 #if FEATURE_ARB_vertex_buffer_object
1008    _mesa_DeleteHashTable(ss->BufferObjects);
1009 #endif
1010    _glthread_DESTROY_MUTEX(ss->Mutex);
1011
1012    FREE(ss);
1013 }
1014
1015
1016 /**
1017  * Initialize fields of gl_current_attrib (aka ctx->Current.*)
1018  */
1019 static void
1020 _mesa_init_current( GLcontext *ctx )
1021 {
1022    GLuint i;
1023
1024    /* Current group */
1025    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
1026       ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
1027    }
1028    /* special cases: */
1029    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 1.0 );
1030    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
1031    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
1032    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
1033    ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_FOG], 0.0, 0.0, 0.0, 0.0 );
1034
1035    ctx->Current.Index = 1;
1036    ctx->Current.EdgeFlag = GL_TRUE;
1037 }
1038
1039
1040 /**
1041  * Initialize fields of gl_constants (aka ctx->Const.*).
1042  * Use defaults from config.h.  The device drivers will often override
1043  * some of these values (such as number of texture units).
1044  */
1045 static void
1046 _mesa_init_constants( GLcontext *ctx )
1047 {
1048    assert(ctx);
1049
1050    assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
1051    assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
1052
1053    /* Constants, may be overriden (usually only reduced) by device drivers */
1054    ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
1055    ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
1056    ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
1057    ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
1058    ctx->Const.MaxTextureUnits = MAX_TEXTURE_UNITS;
1059    ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
1060    ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
1061    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
1062    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
1063    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
1064    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
1065    ctx->Const.MinPointSize = MIN_POINT_SIZE;
1066    ctx->Const.MaxPointSize = MAX_POINT_SIZE;
1067    ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
1068    ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
1069    ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
1070    ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
1071    ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
1072    ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
1073    ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
1074    ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
1075    ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
1076    ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
1077    ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
1078    ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
1079    ctx->Const.MaxLights = MAX_LIGHTS;
1080    ctx->Const.MaxShininess = 128.0;
1081    ctx->Const.MaxSpotExponent = 128.0;
1082    ctx->Const.MaxViewportWidth = MAX_WIDTH;
1083    ctx->Const.MaxViewportHeight = MAX_HEIGHT;
1084 #if FEATURE_ARB_vertex_program
1085    ctx->Const.MaxVertexProgramInstructions = MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS;
1086    ctx->Const.MaxVertexProgramAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
1087    ctx->Const.MaxVertexProgramTemps = MAX_NV_VERTEX_PROGRAM_TEMPS;
1088    ctx->Const.MaxVertexProgramLocalParams = MAX_NV_VERTEX_PROGRAM_PARAMS;
1089    ctx->Const.MaxVertexProgramEnvParams = MAX_NV_VERTEX_PROGRAM_PARAMS;/*XXX*/
1090    ctx->Const.MaxVertexProgramAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
1091 #endif
1092 #if FEATURE_ARB_fragment_program
1093    ctx->Const.MaxFragmentProgramInstructions = MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS;
1094    ctx->Const.MaxFragmentProgramAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
1095    ctx->Const.MaxFragmentProgramTemps = MAX_NV_FRAGMENT_PROGRAM_TEMPS;
1096    ctx->Const.MaxFragmentProgramLocalParams = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
1097    ctx->Const.MaxFragmentProgramEnvParams = MAX_NV_FRAGMENT_PROGRAM_PARAMS;/*XXX*/
1098    ctx->Const.MaxFragmentProgramAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
1099    ctx->Const.MaxFragmentProgramAluInstructions = MAX_FRAGMENT_PROGRAM_ALU_INSTRUCTIONS;
1100    ctx->Const.MaxFragmentProgramTexInstructions = MAX_FRAGMENT_PROGRAM_TEX_INSTRUCTIONS;
1101    ctx->Const.MaxFragmentProgramTexIndirections = MAX_FRAGMENT_PROGRAM_TEX_INDIRECTIONS;
1102 #endif
1103    ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
1104    ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
1105
1106    /* If we're running in the X server, do bounds checking to prevent
1107     * segfaults and server crashes!
1108     */
1109 #if defined(XFree86LOADER) && defined(IN_MODULE)
1110    ctx->Const.CheckArrayBounds = GL_TRUE;
1111 #else
1112    ctx->Const.CheckArrayBounds = GL_FALSE;
1113 #endif
1114
1115    ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
1116
1117    /* sanity checks */
1118    ASSERT(ctx->Const.MaxTextureUnits == MAX2(ctx->Const.MaxTextureImageUnits, ctx->Const.MaxTextureCoordUnits));
1119 }
1120
1121
1122 /**
1123  * Initialize the attribute groups in a GL context.
1124  *
1125  * \param ctx GL context.
1126  *
1127  * Initializes all the attributes, calling the respective <tt>init*</tt>
1128  * functions for the more complex data structures.
1129  */
1130 static GLboolean
1131 init_attrib_groups( GLcontext *ctx )
1132 {
1133    assert(ctx);
1134
1135    /* Constants */
1136    _mesa_init_constants( ctx );
1137
1138    /* Extensions */
1139    _mesa_init_extensions( ctx );
1140
1141    /* Attribute Groups */
1142    _mesa_init_accum( ctx );
1143    _mesa_init_attrib( ctx );
1144    _mesa_init_buffers( ctx );
1145    _mesa_init_buffer_objects( ctx );
1146    _mesa_init_color( ctx );
1147    _mesa_init_colortables( ctx );
1148    _mesa_init_current( ctx );
1149    _mesa_init_depth( ctx );
1150    _mesa_init_debug( ctx );
1151    _mesa_init_display_list( ctx );
1152    _mesa_init_eval( ctx );
1153    _mesa_init_feedback( ctx );
1154    _mesa_init_fog( ctx );
1155    _mesa_init_histogram( ctx );
1156    _mesa_init_hint( ctx );
1157    _mesa_init_line( ctx );
1158    _mesa_init_lighting( ctx );
1159    _mesa_init_matrix( ctx );
1160    _mesa_init_occlude( ctx );
1161    _mesa_init_pixel( ctx );
1162    _mesa_init_point( ctx );
1163    _mesa_init_polygon( ctx );
1164    _mesa_init_program( ctx );
1165    _mesa_init_rastpos( ctx );
1166    _mesa_init_stencil( ctx );
1167    _mesa_init_transform( ctx );
1168    _mesa_init_varray( ctx );
1169    _mesa_init_viewport( ctx );
1170
1171    if (!_mesa_init_texture( ctx ))
1172       return GL_FALSE;
1173
1174    _mesa_init_texture_s3tc( ctx );
1175    _mesa_init_texture_fxt1( ctx );
1176
1177    /* Miscellaneous */
1178    ctx->NewState = _NEW_ALL;
1179    ctx->ErrorValue = (GLenum) GL_NO_ERROR;
1180    ctx->_Facing = 0;
1181 #if CHAN_TYPE == GL_FLOAT
1182    ctx->ClampFragmentColors = GL_FALSE; /* XXX temporary */
1183 #else
1184    ctx->ClampFragmentColors = GL_TRUE;
1185 #endif
1186    ctx->ClampVertexColors = GL_TRUE;
1187
1188    return GL_TRUE;
1189 }
1190
1191
1192 /**
1193  * If the DRI libGL.so library is old, it may not have the entrypoints for
1194  * some recent OpenGL extensions.  Dynamically add them now.
1195  * If we're building stand-alone Mesa where libGL.so has both the dispatcher
1196  * and driver code, this won't be an issue (and calling this function won't
1197  * do any harm).
1198  */
1199 static void
1200 add_newer_entrypoints(void)
1201 {
1202    unsigned   i;
1203    static const struct {
1204       const char * const name;
1205       unsigned  offset;
1206    }
1207    newer_entrypoints[] = {
1208       /* GL_ARB_window_pos aliases with GL_MESA_window_pos */
1209       { "glWindowPos2dARB", 513 },
1210       { "glWindowPos2dvARB", 514 },
1211       { "glWindowPos2fARB", 515 },
1212       { "glWindowPos2fvARB", 516 },
1213       { "glWindowPos2iARB", 517 },
1214       { "glWindowPos2ivARB", 518 },
1215       { "glWindowPos2sARB", 519 },
1216       { "glWindowPos2svARB", 520 },
1217       { "glWindowPos3dARB", 521 },
1218       { "glWindowPos3dvARB", 522 },
1219       { "glWindowPos3fARB", 523 },
1220       { "glWindowPos3fvARB", 524 },
1221       { "glWindowPos3iARB", 525 },
1222       { "glWindowPos3ivARB", 526 },
1223       { "glWindowPos3sARB", 527 },
1224       { "glWindowPos3svARB", 528 },
1225 #if FEATURE_NV_vertex_program
1226       { "glAreProgramsResidentNV", 578 },
1227       { "glBindProgramNV", 579 },
1228       { "glDeleteProgramsNV", 580 },
1229       { "glExecuteProgramNV", 581 },
1230       { "glGenProgramsNV", 582 },
1231       { "glGetProgramParameterdvNV", 583 },
1232       { "glGetProgramParameterfvNV", 584 },
1233       { "glGetProgramivNV", 585 },
1234       { "glGetProgramStringNV", 586 },
1235       { "glGetTrackMatrixivNV", 587 },
1236       { "glGetVertexAttribdvNV", 588 },
1237       { "glGetVertexAttribfvNV", 589 },
1238       { "glGetVertexAttribivNV", 590 },
1239       { "glGetVertexAttribPointervNV", 591 },
1240       { "glIsProgramNV", 592 },
1241       { "glLoadProgramNV", 593 },
1242       { "glProgramParameter4dNV", 594 },
1243       { "glProgramParameter4dvNV", 595 },
1244       { "glProgramParameter4fNV", 596 },
1245       { "glProgramParameter4fvNV", 597 },
1246       { "glProgramParameters4dvNV", 598 },
1247       { "glProgramParameters4fvNV", 599 },
1248       { "glRequestResidentProgramsNV", 600 },
1249       { "glTrackMatrixNV", 601 },
1250       { "glVertexAttribPointerNV", 602 },
1251       { "glVertexAttrib1dNV", 603 },
1252       { "glVertexAttrib1dvNV", 604 },
1253       { "glVertexAttrib1fNV", 605 },
1254       { "glVertexAttrib1fvNV", 606 },
1255       { "glVertexAttrib1sNV", 607 },
1256       { "glVertexAttrib1svNV", 608 },
1257       { "glVertexAttrib2dNV", 609 },
1258       { "glVertexAttrib2dvNV", 610 },
1259       { "glVertexAttrib2fNV", 611 },
1260       { "glVertexAttrib2fvNV", 612 },
1261       { "glVertexAttrib2sNV", 613 },
1262       { "glVertexAttrib2svNV", 614 },
1263       { "glVertexAttrib3dNV", 615 },
1264       { "glVertexAttrib3dvNV", 616 },
1265       { "glVertexAttrib3fNV", 617 },
1266       { "glVertexAttrib3fvNV", 618 },
1267       { "glVertexAttrib3sNV", 619 },
1268       { "glVertexAttrib3svNV", 620 },
1269       { "glVertexAttrib4dNV", 621 },
1270       { "glVertexAttrib4dvNV", 622 },
1271       { "glVertexAttrib4fNV", 623 },
1272       { "glVertexAttrib4fvNV", 624 },
1273       { "glVertexAttrib4sNV", 625 },
1274       { "glVertexAttrib4svNV", 626 },
1275       { "glVertexAttrib4ubNV", 627 },
1276       { "glVertexAttrib4ubvNV", 628 },
1277       { "glVertexAttribs1dvNV", 629 },
1278       { "glVertexAttribs1fvNV", 630 },
1279       { "glVertexAttribs1svNV", 631 },
1280       { "glVertexAttribs2dvNV", 632 },
1281       { "glVertexAttribs2fvNV", 633 },
1282       { "glVertexAttribs2svNV", 634 },
1283       { "glVertexAttribs3dvNV", 635 },
1284       { "glVertexAttribs3fvNV", 636 },
1285       { "glVertexAttribs3svNV", 637 },
1286       { "glVertexAttribs4dvNV", 638 },
1287       { "glVertexAttribs4fvNV", 639 },
1288       { "glVertexAttribs4svNV", 640 },
1289       { "glVertexAttribs4ubvNV", 641 },
1290 #endif
1291       { "glPointParameteriNV", 642 },
1292       { "glPointParameterivNV", 643 },
1293       { "glMultiDrawArraysEXT", 644 },
1294       { "glMultiDrawElementsEXT", 645 },
1295       { "glMultiDrawArraysSUN", _gloffset_MultiDrawArraysEXT  },
1296       { "glMultiDrawElementsSUN", _gloffset_MultiDrawElementsEXT  },
1297       { "glActiveStencilFaceEXT", 646 },
1298 #if FEATURE_NV_fence
1299       { "glDeleteFencesNV", 647 },
1300       { "glGenFencesNV", 648 },
1301       { "glIsFenceNV", 649 },
1302       { "glTestFenceNV", 650 },
1303       { "glGetFenceivNV", 651 },
1304       { "glFinishFenceNV", 652 },
1305       { "glSetFenceNV", 653 },
1306 #endif
1307 #if FEATURE_NV_fragment_program
1308       { "glProgramNamedParameter4fNV", 682 },
1309       { "glProgramNamedParameter4dNV", 683 },
1310       { "glProgramNamedParameter4fvNV", 683 },
1311       { "glProgramNamedParameter4dvNV", 684 },
1312       { "glGetProgramNamedParameterfvNV", 685 },
1313       { "glGetProgramNamedParameterdvNV", 686 },
1314 #endif
1315 #if FEATURE_ARB_vertex_program
1316       { "glVertexAttrib1sARB", _gloffset_VertexAttrib1sNV },
1317       { "glVertexAttrib1fARB", _gloffset_VertexAttrib1fNV },
1318       { "glVertexAttrib1dARB", _gloffset_VertexAttrib1dNV },
1319       { "glVertexAttrib2sARB", _gloffset_VertexAttrib2sNV },
1320       { "glVertexAttrib2fARB", _gloffset_VertexAttrib2fNV },
1321       { "glVertexAttrib2dARB", _gloffset_VertexAttrib2dNV },
1322       { "glVertexAttrib3sARB", _gloffset_VertexAttrib3sNV },
1323       { "glVertexAttrib3fARB", _gloffset_VertexAttrib3fNV },
1324       { "glVertexAttrib3dARB", _gloffset_VertexAttrib3dNV },
1325       { "glVertexAttrib4sARB", _gloffset_VertexAttrib4sNV },
1326       { "glVertexAttrib4fARB", _gloffset_VertexAttrib4fNV },
1327       { "glVertexAttrib4dARB", _gloffset_VertexAttrib4dNV },
1328       { "glVertexAttrib4NubARB", _gloffset_VertexAttrib4ubNV },
1329       { "glVertexAttrib1svARB", _gloffset_VertexAttrib1svNV },
1330       { "glVertexAttrib1fvARB", _gloffset_VertexAttrib1fvNV },
1331       { "glVertexAttrib1dvARB", _gloffset_VertexAttrib1dvNV },
1332       { "glVertexAttrib2svARB", _gloffset_VertexAttrib2svNV },
1333       { "glVertexAttrib2fvARB", _gloffset_VertexAttrib2fvNV },
1334       { "glVertexAttrib2dvARB", _gloffset_VertexAttrib2dvNV },
1335       { "glVertexAttrib3svARB", _gloffset_VertexAttrib3svNV },
1336       { "glVertexAttrib3fvARB", _gloffset_VertexAttrib3fvNV },
1337       { "glVertexAttrib3dvARB", _gloffset_VertexAttrib3dvNV },
1338       { "glVertexAttrib4bvARB", _gloffset_VertexAttrib4bvARB },
1339       { "glVertexAttrib4svARB", _gloffset_VertexAttrib4svNV },
1340       { "glVertexAttrib4ivARB", _gloffset_VertexAttrib4ivARB },
1341       { "glVertexAttrib4ubvARB", _gloffset_VertexAttrib4ubvARB },
1342       { "glVertexAttrib4usvARB", _gloffset_VertexAttrib4usvARB },
1343       { "glVertexAttrib4uivARB", _gloffset_VertexAttrib4uivARB },
1344       { "glVertexAttrib4fvARB", _gloffset_VertexAttrib4fvNV },
1345       { "glVertexAttrib4dvARB", _gloffset_VertexAttrib4dvNV },
1346       { "glVertexAttrib4NbvARB", _gloffset_VertexAttrib4NbvARB },
1347       { "glVertexAttrib4NsvARB", _gloffset_VertexAttrib4NsvARB },
1348       { "glVertexAttrib4NivARB", _gloffset_VertexAttrib4NivARB },
1349       { "glVertexAttrib4NubvARB", _gloffset_VertexAttrib4ubvNV },
1350       { "glVertexAttrib4NusvARB", _gloffset_VertexAttrib4NusvARB },
1351       { "glVertexAttrib4NuivARB", _gloffset_VertexAttrib4NuivARB },
1352       { "glVertexAttribPointerARB", _gloffset_VertexAttribPointerARB },
1353       { "glEnableVertexAttribArrayARB", _gloffset_EnableVertexAttribArrayARB },
1354       { "glDisableVertexAttribArrayARB", _gloffset_DisableVertexAttribArrayARB },
1355       { "glProgramStringARB", _gloffset_ProgramStringARB },
1356       { "glBindProgramARB", _gloffset_BindProgramNV },
1357       { "glDeleteProgramsARB", _gloffset_DeleteProgramsNV },
1358       { "glGenProgramsARB", _gloffset_GenProgramsNV },
1359       { "glIsProgramARB", _gloffset_IsProgramNV },
1360       { "glProgramEnvParameter4dARB", _gloffset_ProgramEnvParameter4dARB },
1361       { "glProgramEnvParameter4dvARB", _gloffset_ProgramEnvParameter4dvARB },
1362       { "glProgramEnvParameter4fARB", _gloffset_ProgramEnvParameter4fARB },
1363       { "glProgramEnvParameter4fvARB", _gloffset_ProgramEnvParameter4fvARB },
1364       { "glProgramLocalParameter4dARB", _gloffset_ProgramLocalParameter4dARB },
1365       { "glProgramLocalParameter4dvARB", _gloffset_ProgramLocalParameter4dvARB },
1366       { "glProgramLocalParameter4fARB", _gloffset_ProgramLocalParameter4fARB },
1367       { "glProgramLocalParameter4fvARB", _gloffset_ProgramLocalParameter4fvARB },
1368       { "glGetProgramEnvParameterdvARB", _gloffset_GetProgramEnvParameterdvARB },
1369       { "glGetProgramEnvParameterfvARB", _gloffset_GetProgramEnvParameterfvARB },
1370       { "glGetProgramLocalParameterdvARB", _gloffset_GetProgramLocalParameterdvARB },
1371       { "glGetProgramLocalParameterfvARB", _gloffset_GetProgramLocalParameterfvARB },
1372       { "glGetProgramivARB", _gloffset_GetProgramivARB },
1373       { "glGetProgramStringARB", _gloffset_GetProgramStringARB },
1374       { "glGetVertexAttribdvARB", _gloffset_GetVertexAttribdvNV },
1375       { "glGetVertexAttribfvARB", _gloffset_GetVertexAttribfvNV },
1376       { "glGetVertexAttribivARB", _gloffset_GetVertexAttribivNV },
1377       { "glGetVertexAttribPointervARB", _gloffset_GetVertexAttribPointervNV },
1378 #endif
1379       { "glMultiModeDrawArraysIBM", _gloffset_MultiModeDrawArraysIBM },
1380       { "glMultiModeDrawElementsIBM", _gloffset_MultiModeDrawElementsIBM },
1381    };
1382
1383    for ( i = 0 ; i < Elements(newer_entrypoints) ; i++ ) {
1384       _glapi_add_entrypoint( newer_entrypoints[i].name,
1385                              newer_entrypoints[i].offset );
1386    }
1387 }
1388
1389
1390 /**
1391  * Initialize a GLcontext struct (rendering context).
1392  *
1393  * This includes allocating all the other structs and arrays which hang off of
1394  * the context by pointers.
1395  * Note that the driver needs to pass in its dd_function_table here since
1396  * we need to at least call driverFunctions->NewTextureObject to create the
1397  * default texture objects.
1398  *
1399  * Called by _mesa_create_context().
1400  *
1401  * Performs the imports and exports callback tables initialization, and
1402  * miscellaneous one-time initializations. If no shared context is supplied one
1403  * is allocated, and increase its reference count.  Setups the GL API dispatch
1404  * tables.  Initialize the TNL module. Sets the maximum Z buffer depth.
1405  * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1406  * for debug flags.
1407  *
1408  * \param ctx the context to initialize
1409  * \param visual describes the visual attributes for this context
1410  * \param share_list points to context to share textures, display lists,
1411  *        etc with, or NULL
1412  * \param driverFunctions table of device driver functions for this context
1413  *        to use
1414  * \param driverContext pointer to driver-specific context data
1415  */
1416 GLboolean
1417 _mesa_initialize_context( GLcontext *ctx,
1418                           const GLvisual *visual,
1419                           GLcontext *share_list,
1420                           const struct dd_function_table *driverFunctions,
1421                           void *driverContext )
1422 {
1423    GLuint dispatchSize;
1424
1425    ASSERT(driverContext);
1426    assert(driverFunctions->NewTextureObject);
1427
1428    /* If the driver wants core Mesa to use special imports, it'll have to
1429     * override these defaults.
1430     */
1431    _mesa_init_default_imports( &(ctx->imports), driverContext );
1432
1433    /* initialize the exports (Mesa functions called by the window system) */
1434    _mesa_init_default_exports( &(ctx->exports) );
1435
1436    /* misc one-time initializations */
1437    one_time_init(ctx);
1438
1439    ctx->Visual = *visual;
1440    ctx->DrawBuffer = NULL;
1441    ctx->ReadBuffer = NULL;
1442
1443    /* Plug in driver functions and context pointer here.
1444     * This is important because when we call alloc_shared_state() below
1445     * we'll call ctx->Driver.NewTextureObject() to create the default
1446     * textures.
1447     */
1448    ctx->Driver = *driverFunctions;
1449    ctx->DriverCtx = driverContext;
1450
1451    if (share_list) {
1452       /* share state with another context */
1453       ctx->Shared = share_list->Shared;
1454    }
1455    else {
1456       /* allocate new, unshared state */
1457       if (!alloc_shared_state( ctx )) {
1458          return GL_FALSE;
1459       }
1460    }
1461    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1462    ctx->Shared->RefCount++;
1463    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1464
1465    if (!init_attrib_groups( ctx )) {
1466       free_shared_state(ctx, ctx->Shared);
1467       return GL_FALSE;
1468    }
1469
1470    /* libGL ABI coordination */
1471    add_newer_entrypoints();
1472
1473    /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1474     * In practice, this'll be the same for stand-alone Mesa.  But for DRI
1475     * Mesa we do this to accomodate different versions of libGL and various
1476     * DRI drivers.
1477     */
1478    dispatchSize = MAX2(_glapi_get_dispatch_table_size(),
1479                        sizeof(struct _glapi_table) / sizeof(void *));
1480
1481    /* setup API dispatch tables */
1482    ctx->Exec = (struct _glapi_table *) CALLOC(dispatchSize * sizeof(void*));
1483    ctx->Save = (struct _glapi_table *) CALLOC(dispatchSize * sizeof(void*));
1484    if (!ctx->Exec || !ctx->Save) {
1485       free_shared_state(ctx, ctx->Shared);
1486       if (ctx->Exec)
1487          FREE( ctx->Exec );
1488    }
1489    _mesa_init_exec_table(ctx->Exec, dispatchSize);
1490    ctx->CurrentDispatch = ctx->Exec;
1491
1492 #if _HAVE_FULL_GL
1493    _mesa_init_dlist_table(ctx->Save, dispatchSize);
1494    _mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
1495
1496
1497    /* Neutral tnl module stuff */
1498    _mesa_init_exec_vtxfmt( ctx );
1499    ctx->TnlModule.Current = NULL;
1500    ctx->TnlModule.SwapCount = 0;
1501 #endif
1502
1503    return GL_TRUE;
1504 }
1505
1506
1507 /**
1508  * Allocate and initialize a GLcontext structure.
1509  * Note that the driver needs to pass in its dd_function_table here since
1510  * we need to at least call driverFunctions->NewTextureObject to initialize
1511  * the rendering context.
1512  *
1513  * \param visual a GLvisual pointer (we copy the struct contents)
1514  * \param share_list another context to share display lists with or NULL
1515  * \param driverFunctions points to the dd_function_table into which the
1516  *        driver has plugged in all its special functions.
1517  * \param driverCtx points to the device driver's private context state
1518  *
1519  * \return pointer to a new __GLcontextRec or NULL if error.
1520  */
1521 GLcontext *
1522 _mesa_create_context( const GLvisual *visual,
1523                       GLcontext *share_list,
1524                       const struct dd_function_table *driverFunctions,
1525                       void *driverContext )
1526
1527 {
1528    GLcontext *ctx;
1529
1530    ASSERT(visual);
1531    ASSERT(driverContext);
1532
1533    ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
1534    if (!ctx)
1535       return NULL;
1536
1537    if (_mesa_initialize_context(ctx, visual, share_list,
1538                                 driverFunctions, driverContext)) {
1539       return ctx;
1540    }
1541    else {
1542       _mesa_free(ctx);
1543       return NULL;
1544    }
1545 }
1546
1547
1548 /**
1549  * Free the data associated with the given context.
1550  *
1551  * But doesn't free the GLcontext struct itself.
1552  *
1553  * \sa _mesa_initialize_context() and init_attrib_groups().
1554  */
1555 void
1556 _mesa_free_context_data( GLcontext *ctx )
1557 {
1558    /* if we're destroying the current context, unbind it first */
1559    if (ctx == _mesa_get_current_context()) {
1560       _mesa_make_current(NULL, NULL);
1561    }
1562
1563    _mesa_free_lighting_data( ctx );
1564    _mesa_free_eval_data( ctx );
1565    _mesa_free_texture_data( ctx );
1566    _mesa_free_matrix_data( ctx );
1567    _mesa_free_viewport_data( ctx );
1568    _mesa_free_colortables_data( ctx );
1569    _mesa_free_program_data(ctx);
1570    _mesa_free_occlude_data(ctx);
1571
1572 #if FEATURE_ARB_vertex_buffer_object
1573    _mesa_delete_buffer_object(ctx, ctx->Array.NullBufferObj);
1574 #endif
1575
1576    /* Shared context state (display lists, textures, etc) */
1577    _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1578    ctx->Shared->RefCount--;
1579    assert(ctx->Shared->RefCount >= 0);
1580    _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1581    if (ctx->Shared->RefCount == 0) {
1582       /* free shared state */
1583       free_shared_state( ctx, ctx->Shared );
1584    }
1585
1586    if (ctx->Extensions.String)
1587       FREE((void *) ctx->Extensions.String);
1588
1589    FREE(ctx->Exec);
1590    FREE(ctx->Save);
1591 }
1592
1593
1594 /**
1595  * Destroy a GLcontext structure.
1596  *
1597  * \param ctx GL context.
1598  *
1599  * Calls _mesa_free_context_data() and frees the GLcontext structure itself.
1600  */
1601 void
1602 _mesa_destroy_context( GLcontext *ctx )
1603 {
1604    if (ctx) {
1605       _mesa_free_context_data(ctx);
1606       FREE( (void *) ctx );
1607    }
1608 }
1609
1610
1611 #if _HAVE_FULL_GL
1612 /**
1613  * Copy attribute groups from one context to another.
1614  *
1615  * \param src source context
1616  * \param dst destination context
1617  * \param mask bitwise OR of GL_*_BIT flags
1618  *
1619  * According to the bits specified in \p mask, copies the corresponding
1620  * attributes from \p src into \p dst.  For many of the attributes a simple \c
1621  * memcpy is not enough due to the existence of internal pointers in their data
1622  * structures.
1623  */
1624 void
1625 _mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
1626 {
1627    if (mask & GL_ACCUM_BUFFER_BIT) {
1628       /* OK to memcpy */
1629       dst->Accum = src->Accum;
1630    }
1631    if (mask & GL_COLOR_BUFFER_BIT) {
1632       /* OK to memcpy */
1633       dst->Color = src->Color;
1634    }
1635    if (mask & GL_CURRENT_BIT) {
1636       /* OK to memcpy */
1637       dst->Current = src->Current;
1638    }
1639    if (mask & GL_DEPTH_BUFFER_BIT) {
1640       /* OK to memcpy */
1641       dst->Depth = src->Depth;
1642    }
1643    if (mask & GL_ENABLE_BIT) {
1644       /* no op */
1645    }
1646    if (mask & GL_EVAL_BIT) {
1647       /* OK to memcpy */
1648       dst->Eval = src->Eval;
1649    }
1650    if (mask & GL_FOG_BIT) {
1651       /* OK to memcpy */
1652       dst->Fog = src->Fog;
1653    }
1654    if (mask & GL_HINT_BIT) {
1655       /* OK to memcpy */
1656       dst->Hint = src->Hint;
1657    }
1658    if (mask & GL_LIGHTING_BIT) {
1659       GLuint i;
1660       /* begin with memcpy */
1661       MEMCPY( &dst->Light, &src->Light, sizeof(struct gl_light) );
1662       /* fixup linked lists to prevent pointer insanity */
1663       make_empty_list( &(dst->Light.EnabledList) );
1664       for (i = 0; i < MAX_LIGHTS; i++) {
1665          if (dst->Light.Light[i].Enabled) {
1666             insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
1667          }
1668       }
1669    }
1670    if (mask & GL_LINE_BIT) {
1671       /* OK to memcpy */
1672       dst->Line = src->Line;
1673    }
1674    if (mask & GL_LIST_BIT) {
1675       /* OK to memcpy */
1676       dst->List = src->List;
1677    }
1678    if (mask & GL_PIXEL_MODE_BIT) {
1679       /* OK to memcpy */
1680       dst->Pixel = src->Pixel;
1681    }
1682    if (mask & GL_POINT_BIT) {
1683       /* OK to memcpy */
1684       dst->Point = src->Point;
1685    }
1686    if (mask & GL_POLYGON_BIT) {
1687       /* OK to memcpy */
1688       dst->Polygon = src->Polygon;
1689    }
1690    if (mask & GL_POLYGON_STIPPLE_BIT) {
1691       /* Use loop instead of MEMCPY due to problem with Portland Group's
1692        * C compiler.  Reported by John Stone.
1693        */
1694       GLuint i;
1695       for (i = 0; i < 32; i++) {
1696          dst->PolygonStipple[i] = src->PolygonStipple[i];
1697       }
1698    }
1699    if (mask & GL_SCISSOR_BIT) {
1700       /* OK to memcpy */
1701       dst->Scissor = src->Scissor;
1702    }
1703    if (mask & GL_STENCIL_BUFFER_BIT) {
1704       /* OK to memcpy */
1705       dst->Stencil = src->Stencil;
1706    }
1707    if (mask & GL_TEXTURE_BIT) {
1708       /* Cannot memcpy because of pointers */
1709       _mesa_copy_texture_state(src, dst);
1710    }
1711    if (mask & GL_TRANSFORM_BIT) {
1712       /* OK to memcpy */
1713       dst->Transform = src->Transform;
1714    }
1715    if (mask & GL_VIEWPORT_BIT) {
1716       /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1717       dst->Viewport.X = src->Viewport.X;
1718       dst->Viewport.Y = src->Viewport.Y;
1719       dst->Viewport.Width = src->Viewport.Width;
1720       dst->Viewport.Height = src->Viewport.Height;
1721       dst->Viewport.Near = src->Viewport.Near;
1722       dst->Viewport.Far = src->Viewport.Far;
1723       _math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
1724    }
1725
1726    /* XXX FIXME:  Call callbacks?
1727     */
1728    dst->NewState = _NEW_ALL;
1729 }
1730 #endif
1731
1732
1733 /**
1734  * Check if the given context can render into the given framebuffer
1735  * by checking visual attributes.
1736  * \return GL_TRUE if compatible, GL_FALSE otherwise.
1737  */
1738 static GLboolean
1739 check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
1740 {
1741    const GLvisual *ctxvis = &ctx->Visual;
1742    const GLvisual *bufvis = &buffer->Visual;
1743
1744    if (ctxvis == bufvis)
1745       return GL_TRUE;
1746
1747    if (ctxvis->rgbMode != bufvis->rgbMode)
1748       return GL_FALSE;
1749    if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
1750       return GL_FALSE;
1751    if (ctxvis->stereoMode && !bufvis->stereoMode)
1752       return GL_FALSE;
1753    if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
1754       return GL_FALSE;
1755    if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
1756       return GL_FALSE;
1757    if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
1758       return GL_FALSE;
1759    if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
1760       return GL_FALSE;
1761    if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
1762       return GL_FALSE;
1763    if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
1764       return GL_FALSE;
1765    if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
1766       return GL_FALSE;
1767    if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
1768       return GL_FALSE;
1769
1770    return GL_TRUE;
1771 }
1772
1773
1774 /**
1775  * Set the current context, binding the given frame buffer to the context.
1776  *
1777  * \param newCtx new GL context.
1778  * \param buffer framebuffer.
1779  *
1780  * Calls _mesa_make_current2() with \p buffer as read and write framebuffer.
1781  */
1782 void
1783 _mesa_make_current( GLcontext *newCtx, GLframebuffer *buffer )
1784 {
1785    _mesa_make_current2( newCtx, buffer, buffer );
1786 }
1787
1788 /**
1789  * Bind the given context to the given draw-buffer and read-buffer and
1790  * make it the current context for this thread.
1791  *
1792  * \param newCtx new GL context. If NULL then there will be no current GL
1793  * context.
1794  * \param drawBuffer draw framebuffer.
1795  * \param readBuffer read framebuffer.
1796  *
1797  * Check that the context's and framebuffer's visuals are compatible, returning
1798  * immediately otherwise. Sets the glapi current context via
1799  * _glapi_set_context(). If \p newCtx is not NULL, associates \p drawBuffer and
1800  * \p readBuffer with it and calls dd_function_table::ResizeBuffers if the buffers size has changed.
1801  * Calls dd_function_table::MakeCurrent callback if defined.
1802  *
1803  * When a context is bound by the first time and the \c MESA_INFO environment
1804  * variable is set it calls print_info() as an aid for remote user
1805  * troubleshooting.
1806  */
1807 void
1808 _mesa_make_current2( GLcontext *newCtx, GLframebuffer *drawBuffer,
1809                      GLframebuffer *readBuffer )
1810 {
1811    if (MESA_VERBOSE)
1812       _mesa_debug(newCtx, "_mesa_make_current2()\n");
1813
1814    /* Check that the context's and framebuffer's visuals are compatible.
1815     */
1816    if (newCtx && drawBuffer && newCtx->DrawBuffer != drawBuffer) {
1817       if (!check_compatible(newCtx, drawBuffer))
1818          return;
1819    }
1820    if (newCtx && readBuffer && newCtx->ReadBuffer != readBuffer) {
1821       if (!check_compatible(newCtx, readBuffer))
1822          return;
1823    }
1824
1825    /* We call this function periodically (just here for now) in
1826     * order to detect when multithreading has begun.
1827     */
1828    _glapi_check_multithread();
1829
1830    _glapi_set_context((void *) newCtx);
1831    ASSERT(_mesa_get_current_context() == newCtx);
1832
1833
1834    if (!newCtx) {
1835       _glapi_set_dispatch(NULL);  /* none current */
1836    }
1837    else {
1838       _glapi_set_dispatch(newCtx->CurrentDispatch);
1839
1840       if (drawBuffer && readBuffer) {
1841          /* TODO: check if newCtx and buffer's visual match??? */
1842          newCtx->DrawBuffer = drawBuffer;
1843          newCtx->ReadBuffer = readBuffer;
1844          newCtx->NewState |= _NEW_BUFFERS;
1845
1846 #if _HAVE_FULL_GL
1847          if (drawBuffer->Width == 0 && drawBuffer->Height == 0) {
1848             /* get initial window size */
1849             GLuint bufWidth, bufHeight;
1850
1851             /* ask device driver for size of output buffer */
1852             (*newCtx->Driver.GetBufferSize)( drawBuffer, &bufWidth, &bufHeight );
1853
1854             if (drawBuffer->Width != bufWidth ||
1855                 drawBuffer->Height != bufHeight) {
1856
1857                drawBuffer->Width = bufWidth;
1858                drawBuffer->Height = bufHeight;
1859
1860                newCtx->Driver.ResizeBuffers( drawBuffer );
1861             }
1862          }
1863
1864          if (readBuffer != drawBuffer &&
1865              readBuffer->Width == 0 && readBuffer->Height == 0) {
1866             /* get initial window size */
1867             GLuint bufWidth, bufHeight;
1868
1869             /* ask device driver for size of output buffer */
1870             (*newCtx->Driver.GetBufferSize)( readBuffer, &bufWidth, &bufHeight );
1871
1872             if (readBuffer->Width != bufWidth ||
1873                 readBuffer->Height != bufHeight) {
1874
1875                readBuffer->Width = bufWidth;
1876                readBuffer->Height = bufHeight;
1877
1878                newCtx->Driver.ResizeBuffers( readBuffer );
1879             }
1880          }
1881 #endif
1882       }
1883
1884       /* Alert the driver - usually passed on to the sw t&l module,
1885        * but also used to detect threaded cases in the radeon codegen
1886        * hw t&l module.
1887        */
1888       if (newCtx->Driver.MakeCurrent)
1889          newCtx->Driver.MakeCurrent( newCtx, drawBuffer, readBuffer );
1890
1891       /* We can use this to help debug user's problems.  Tell them to set
1892        * the MESA_INFO env variable before running their app.  Then the
1893        * first time each context is made current we'll print some useful
1894        * information.
1895        */
1896       if (newCtx->FirstTimeCurrent) {
1897          if (_mesa_getenv("MESA_INFO")) {
1898             _mesa_print_info();
1899          }
1900          newCtx->FirstTimeCurrent = GL_FALSE;
1901       }
1902    }
1903 }
1904
1905 /**
1906  * Get current context for the calling thread.
1907  *
1908  * \return pointer to the current GL context.
1909  *
1910  * Calls _glapi_get_context(). This isn't the fastest way to get the current
1911  * context.  If you need speed, see the #GET_CURRENT_CONTEXT macro in context.h.
1912  */
1913 GLcontext *
1914 _mesa_get_current_context( void )
1915 {
1916    return (GLcontext *) _glapi_get_context();
1917 }
1918
1919 /**
1920  * Get context's current API dispatch table.
1921  *
1922  * It'll either be the immediate-mode execute dispatcher or the display list
1923  * compile dispatcher.
1924  *
1925  * \param ctx GL context.
1926  *
1927  * \return pointer to dispatch_table.
1928  *
1929  * Simply returns __GLcontextRec::CurrentDispatch.
1930  */
1931 struct _glapi_table *
1932 _mesa_get_dispatch(GLcontext *ctx)
1933 {
1934    return ctx->CurrentDispatch;
1935 }
1936
1937 /*@}*/
1938
1939
1940 /**********************************************************************/
1941 /** \name Miscellaneous functions                                     */
1942 /**********************************************************************/
1943 /*@{*/
1944
1945 /**
1946  * Record an error.
1947  *
1948  * \param ctx GL context.
1949  * \param error error code.
1950  *
1951  * Records the given error code and call the driver's dd_function_table::Error
1952  * function if defined.
1953  *
1954  * \sa
1955  * This is called via _mesa_error().
1956  */
1957 void
1958 _mesa_record_error( GLcontext *ctx, GLenum error )
1959 {
1960    if (!ctx)
1961       return;
1962
1963    if (ctx->ErrorValue == GL_NO_ERROR) {
1964       ctx->ErrorValue = error;
1965    }
1966
1967    /* Call device driver's error handler, if any.  This is used on the Mac. */
1968    if (ctx->Driver.Error) {
1969       (*ctx->Driver.Error)( ctx );
1970    }
1971 }
1972
1973 /**
1974  * Execute glFinish().
1975  *
1976  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1977  * dd_function_table::Finish driver callback, if not NULL.
1978  */
1979 void GLAPIENTRY
1980 _mesa_Finish( void )
1981 {
1982    GET_CURRENT_CONTEXT(ctx);
1983    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1984    if (ctx->Driver.Finish) {
1985       (*ctx->Driver.Finish)( ctx );
1986    }
1987 }
1988
1989 /**
1990  * Execute glFlush().
1991  *
1992  * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1993  * dd_function_table::Flush driver callback, if not NULL.
1994  */
1995 void GLAPIENTRY
1996 _mesa_Flush( void )
1997 {
1998    GET_CURRENT_CONTEXT(ctx);
1999    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
2000    if (ctx->Driver.Flush) {
2001       (*ctx->Driver.Flush)( ctx );
2002    }
2003 }
2004
2005
2006 /*@}*/