src/mesa/glapi/glapi.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /*
  27  * This file manages the OpenGL API dispatch layer.
  28  * The dispatch table (struct _glapi_table) is basically just a list
  29  * of function pointers.
  30  * There are functions to set/get the current dispatch table for the
  31  * current thread and to manage registration/dispatch of dynamically
  32  * added extension functions.
  33  *
  34  * It's intended that this file and the other glapi*.[ch] files are
  35  * flexible enough to be reused in several places:  XFree86, DRI-
  36  * based libGL.so, and perhaps the SGI SI.
  37  *
  38  * NOTE: There are no dependencies on Mesa in this code.
  39  *
  40  * Versions (API changes):
  41  *   2000/02/23  - original version for Mesa 3.3 and XFree86 4.0
  42  *   2001/01/16  - added dispatch override feature for Mesa 3.5
  43  *   2002/06/28  - added _glapi_set_warning_func(), Mesa 4.1.
  44  *   2002/10/01  - _glapi_get_proc_address() will now generate new entrypoints
  45  *                 itself (using offset ~0).  _glapi_add_entrypoint() can be
  46  *                 called afterward and it'll fill in the correct dispatch
  47  *                 offset.  This allows DRI libGL to avoid probing for DRI
  48  *                 drivers!  No changes to the public glapi interface.
  49  */
  50
  51
  52
  53 #ifdef HAVE_DIX_CONFIG_H
  54
  55 #include <dix-config.h>
  56 #define PUBLIC
  57
  58 #else
  59
  60 #include "main/glheader.h"
  61
  62 #endif
  63
  64 #include "main/compiler.h"
  65
  66 #include <stdlib.h>
  67 #include <string.h>
  68 #ifdef DEBUG
  69 #include <assert.h>
  70 #endif
  71
  72 #include "glapi/glapi.h"
  73 #include "glapi/glapioffsets.h"
  74 #include "glapi/glapitable.h"
  75
  76 /***** BEGIN NO-OP DISPATCH *****/
  77
  78 static GLboolean WarnFlag = GL_FALSE;
  79 static _glapi_warning_func warning_func;
  80
  81 /*
  82  * Enable/disable printing of warning messages.
  83  */
  84 PUBLIC void
  85 _glapi_noop_enable_warnings(GLboolean enable)
  86 {
  87    WarnFlag = enable;
  88 }
  89
  90 /*
  91  * Register a callback function for reporting errors.
  92  */
  93 PUBLIC void
  94 _glapi_set_warning_func( _glapi_warning_func func )
  95 {
  96    warning_func = func;
  97 }
  98
  99 static int
 100 warn(const char *func)
 101 {
 102 #if !defined(_WIN32_WCE)
 103    if ((WarnFlag || getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
 104        && warning_func) {
 105       warning_func(NULL, "GL User Error: called without context: %s", func);
 106    }
 107 #endif
 108    return 0;
 109 }
 110
 111 #ifdef DEBUG
 112
 113 #define KEYWORD1 static
 114 #define KEYWORD1_ALT static
 115 #define KEYWORD2 GLAPIENTRY
 116 #define NAME(func)  NoOp##func
 117
 118 #define F NULL
 119
 120 #define DISPATCH(func, args, msg)                                             \
 121    warn(#func);
 122
 123 #define RETURN_DISPATCH(func, args, msg)                                      \
 124    return warn(#func);
 125
 126 #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
 127
 128 #else
 129
 130 static void
 131 NoOpGeneric(void)
 132 {
 133    if ((WarnFlag || getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
 134        && warning_func) {
 135       warning_func(NULL, "GL User Error: calling GL function");
 136    }
 137 }
 138
 139 #define TABLE_ENTRY(name) (_glapi_proc) NoOpGeneric
 140
 141 #endif
 142
 143 #define DISPATCH_TABLE_NAME __glapi_noop_table
 144 #define UNUSED_TABLE_NAME __unused_noop_functions
 145
 146 static GLint NoOpUnused(void)
 147 {
 148    return warn("extension function");
 149 }
 150
 151 #include "glapi/glapitemp.h"
 152
 153 /***** END NO-OP DISPATCH *****/
 154
 155
 156
 157 /**
 158  * \name Current dispatch and current context control variables
 159  *
 160  * Depending on whether or not multithreading is support, and the type of
 161  * support available, several variables are used to store the current context
 162  * pointer and the current dispatch table pointer.  In the non-threaded case,
 163  * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this
 164  * purpose.
 165  *
 166  * In the "normal" threaded case, the variables \c _glapi_Dispatch and
 167  * \c _glapi_Context will be \c NULL if an application is detected as being
 168  * multithreaded.  Single-threaded applications will use \c _glapi_Dispatch
 169  * and \c _glapi_Context just like the case without any threading support.
 170  * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state
 171  * data \c _gl_DispatchTSD and \c ContextTSD are used.  Drivers and the
 172  * static dispatch functions access these variables via \c _glapi_get_dispatch
 173  * and \c _glapi_get_context.
 174  *
 175  * There is a race condition in setting \c _glapi_Dispatch to \c NULL.  It is
 176  * possible for the original thread to be setting it at the same instant a new
 177  * thread, perhaps running on a different processor, is clearing it.  Because
 178  * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is
 179  * used to determine whether or not the application is multithreaded.
 180  *
 181  * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are
 182  * hardcoded to \c NULL.  Instead the TLS variables \c _glapi_tls_Dispatch and
 183  * \c _glapi_tls_Context are used.  Having \c _glapi_Dispatch and
 184  * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability
 185  * between TLS enabled loaders and non-TLS DRI drivers.
 186  */
 187 /*@{*/
 188 #if defined(GLX_USE_TLS)
 189
 190 PUBLIC __thread struct _glapi_table * _glapi_tls_Dispatch
 191     __attribute__((tls_model("initial-exec")))
 192     = (struct _glapi_table *) __glapi_noop_table;
 193
 194 PUBLIC __thread void * _glapi_tls_Context
 195     __attribute__((tls_model("initial-exec")));
 196
 197 PUBLIC const struct _glapi_table *_glapi_Dispatch = NULL;
 198 PUBLIC const void *_glapi_Context = NULL;
 199
 200 #else
 201
 202 #if defined(THREADS)
 203
 204 #ifdef WIN32_THREADS
 205 /* _glthread_DECLARE_STATIC_MUTEX is broken on windows.  There will be race! */
 206 #define CHECK_MULTITHREAD_LOCK()
 207 #define CHECK_MULTITHREAD_UNLOCK()
 208 #else
 209 _glthread_DECLARE_STATIC_MUTEX(ThreadCheckMutex);
 210 #define CHECK_MULTITHREAD_LOCK() _glthread_LOCK_MUTEX(ThreadCheckMutex)
 211 #define CHECK_MULTITHREAD_UNLOCK() _glthread_UNLOCK_MUTEX(ThreadCheckMutex)
 212 #endif
 213
 214 static GLboolean ThreadSafe = GL_FALSE;  /**< In thread-safe mode? */
 215 _glthread_TSD _gl_DispatchTSD;           /**< Per-thread dispatch pointer */
 216 static _glthread_TSD ContextTSD;         /**< Per-thread context pointer */
 217
 218 #if defined(WIN32_THREADS)
 219 void FreeTSD(_glthread_TSD *p);
 220 void FreeAllTSD(void)
 221 {
 222    FreeTSD(&_gl_DispatchTSD);
 223    FreeTSD(&ContextTSD);
 224 }
 225 #endif /* defined(WIN32_THREADS) */
 226
 227 #endif /* defined(THREADS) */
 228
 229 PUBLIC struct _glapi_table *_glapi_Dispatch =
 230   (struct _glapi_table *) __glapi_noop_table;
 231 PUBLIC void *_glapi_Context = NULL;
 232
 233 #endif /* defined(GLX_USE_TLS) */
 234 /*@}*/
 235
 236
 237
 238
 239 /**
 240  * We should call this periodically from a function such as glXMakeCurrent
 241  * in order to test if multiple threads are being used.
 242  */
 243 PUBLIC void
 244 _glapi_check_multithread(void)
 245 {
 246 #if defined(THREADS) && !defined(GLX_USE_TLS)
 247    static unsigned long knownID;
 248    static GLboolean firstCall = GL_TRUE;
 249
 250    if (ThreadSafe)
 251       return;
 252
 253    CHECK_MULTITHREAD_LOCK();
 254    if (firstCall) {
 255       /* initialize TSDs */
 256       (void) _glthread_GetTSD(&ContextTSD);
 257       (void) _glthread_GetTSD(&_gl_DispatchTSD);
 258
 259       knownID = _glthread_GetID();
 260       firstCall = GL_FALSE;
 261    }
 262    else if (knownID != _glthread_GetID()) {
 263       ThreadSafe = GL_TRUE;
 264       _glapi_set_dispatch(NULL);
 265       _glapi_set_context(NULL);
 266    }
 267    CHECK_MULTITHREAD_UNLOCK();
 268 #endif
 269 }
 270
 271
 272
 273 /**
 274  * Set the current context pointer for this thread.
 275  * The context pointer is an opaque type which should be cast to
 276  * void from the real context pointer type.
 277  */
 278 PUBLIC void
 279 _glapi_set_context(void *context)
 280 {
 281    (void) __unused_noop_functions; /* silence a warning */
 282 #if defined(GLX_USE_TLS)
 283    _glapi_tls_Context = context;
 284 #elif defined(THREADS)
 285    _glthread_SetTSD(&ContextTSD, context);
 286    _glapi_Context = (ThreadSafe) ? NULL : context;
 287 #else
 288    _glapi_Context = context;
 289 #endif
 290 }
 291
 292
 293
 294 /**
 295  * Get the current context pointer for this thread.
 296  * The context pointer is an opaque type which should be cast from
 297  * void to the real context pointer type.
 298  */
 299 PUBLIC void *
 300 _glapi_get_context(void)
 301 {
 302 #if defined(GLX_USE_TLS)
 303    return _glapi_tls_Context;
 304 #elif defined(THREADS)
 305    if (ThreadSafe) {
 306       return _glthread_GetTSD(&ContextTSD);
 307    }
 308    else {
 309       return _glapi_Context;
 310    }
 311 #else
 312    return _glapi_Context;
 313 #endif
 314 }
 315
 316 #ifdef USE_X86_ASM
 317
 318 #if defined( GLX_USE_TLS )
 319 extern       GLubyte gl_dispatch_functions_start[];
 320 extern       GLubyte gl_dispatch_functions_end[];
 321 #else
 322 extern const GLubyte gl_dispatch_functions_start[];
 323 #endif
 324
 325 #endif /* USE_X86_ASM */
 326
 327
 328 #if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)
 329 # define DISPATCH_FUNCTION_SIZE  16
 330 #elif defined(USE_X86_ASM)
 331 # if defined(THREADS) && !defined(GLX_USE_TLS)
 332 #  define DISPATCH_FUNCTION_SIZE  32
 333 # else
 334 #  define DISPATCH_FUNCTION_SIZE  16
 335 # endif
 336 #endif
 337
 338 #ifdef USE_SPARC_ASM
 339 #ifdef GLX_USE_TLS
 340 extern unsigned int __glapi_sparc_tls_stub;
 341 #else
 342 extern unsigned int __glapi_sparc_pthread_stub;
 343 #endif
 344 #endif
 345
 346 #if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer)
 347 # define NEED_FUNCTION_POINTER
 348 #endif
 349
 350 #if defined(PTHREADS) || defined(GLX_USE_TLS)
 351 /**
 352  * Perform platform-specific GL API entry-point fixups.
 353  */
 354 static void
 355 init_glapi_relocs( void )
 356 {
 357 #if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
 358     extern unsigned long _x86_get_dispatch(void);
 359     char run_time_patch[] = {
 360        0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
 361     };
 362     GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
 363     const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
 364     GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
 365
 366     *offset = _x86_get_dispatch();
 367     while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
 368         (void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
 369         curr_func += DISPATCH_FUNCTION_SIZE;
 370     }
 371 #endif
 372 #ifdef USE_SPARC_ASM
 373     extern void __glapi_sparc_icache_flush(unsigned int *);
 374     static const unsigned int template[] = {
 375 #ifdef GLX_USE_TLS
 376         0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */
 377         0x8730e00a, /* srl %g3, 10, %g3 */
 378         0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */
 379 #ifdef __arch64__
 380         0xc259c002, /* ldx [%g7 + %g2], %g1 */
 381         0xc2584003, /* ldx [%g1 + %g3], %g1 */
 382 #else
 383         0xc201c002, /* ld [%g7 + %g2], %g1 */
 384         0xc2004003, /* ld [%g1 + %g3], %g1 */
 385 #endif
 386         0x81c04000, /* jmp %g1 */
 387         0x01000000, /* nop  */
 388 #else
 389 #ifdef __arch64__
 390         0x03000000, /* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */
 391         0x05000000, /* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */
 392         0x82106000, /* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */
 393         0x8730e00a, /* 64-bit 0x0c --> srl %g3, 10, %g3 */
 394         0x83287020, /* 64-bit 0x10 --> sllx %g1, 32, %g1 */
 395         0x82004002, /* 64-bit 0x14 --> add %g1, %g2, %g1 */
 396         0xc2586000, /* 64-bit 0x18 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */
 397 #else
 398         0x03000000, /* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */
 399         0x8730e00a, /* 32-bit 0x04 --> srl %g3, 10, %g3 */
 400         0xc2006000, /* 32-bit 0x08 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
 401 #endif
 402         0x80a06000, /*             --> cmp %g1, 0 */
 403         0x02800005, /*             --> be +4*5 */
 404         0x01000000, /*             -->  nop  */
 405 #ifdef __arch64__
 406         0xc2584003, /* 64-bit      --> ldx [%g1 + %g3], %g1 */
 407 #else
 408         0xc2004003, /* 32-bit      --> ld [%g1 + %g3], %g1 */
 409 #endif
 410         0x81c04000, /*             --> jmp %g1 */
 411         0x01000000, /*             --> nop  */
 412 #ifdef __arch64__
 413         0x9de3bf80, /* 64-bit      --> save  %sp, -128, %sp */
 414 #else
 415         0x9de3bfc0, /* 32-bit      --> save  %sp, -64, %sp */
 416 #endif
 417         0xa0100003, /*             --> mov  %g3, %l0 */
 418         0x40000000, /*             --> call _glapi_get_dispatch */
 419         0x01000000, /*             -->  nop */
 420         0x82100008, /*             --> mov %o0, %g1 */
 421         0x86100010, /*             --> mov %l0, %g3 */
 422         0x10bffff7, /*             --> ba -4*9 */
 423         0x81e80000, /*             -->  restore  */
 424 #endif
 425     };
 426 #ifdef GLX_USE_TLS
 427     extern unsigned long __glapi_sparc_get_dispatch(void);
 428     unsigned int *code = &__glapi_sparc_tls_stub;
 429     unsigned long dispatch = __glapi_sparc_get_dispatch();
 430 #else
 431     unsigned int *code = &__glapi_sparc_pthread_stub;
 432     unsigned long dispatch = (unsigned long) &_glapi_Dispatch;
 433     unsigned long call_dest = (unsigned long ) &_glapi_get_dispatch;
 434     int idx;
 435 #endif
 436
 437 #if defined(GLX_USE_TLS)
 438     code[0] = template[0] | (dispatch >> 10);
 439     code[1] = template[1];
 440     __glapi_sparc_icache_flush(&code[0]);
 441     code[2] = template[2] | (dispatch & 0x3ff);
 442     code[3] = template[3];
 443     __glapi_sparc_icache_flush(&code[2]);
 444     code[4] = template[4];
 445     code[5] = template[5];
 446     __glapi_sparc_icache_flush(&code[4]);
 447     code[6] = template[6];
 448     __glapi_sparc_icache_flush(&code[6]);
 449 #else
 450 #if defined(__arch64__)
 451     code[0] = template[0] | (dispatch >> (32 + 10));
 452     code[1] = template[1] | ((dispatch & 0xffffffff) >> 10);
 453     __glapi_sparc_icache_flush(&code[0]);
 454     code[2] = template[2] | ((dispatch >> 32) & 0x3ff);
 455     code[3] = template[3];
 456     __glapi_sparc_icache_flush(&code[2]);
 457     code[4] = template[4];
 458     code[5] = template[5];
 459     __glapi_sparc_icache_flush(&code[4]);
 460     code[6] = template[6] | (dispatch & 0x3ff);
 461     idx = 7;
 462 #else
 463     code[0] = template[0] | (dispatch >> 10);
 464     code[1] = template[1];
 465     __glapi_sparc_icache_flush(&code[0]);
 466     code[2] = template[2] | (dispatch & 0x3ff);
 467     idx = 3;
 468 #endif
 469     code[idx + 0] = template[idx + 0];
 470     __glapi_sparc_icache_flush(&code[idx - 1]);
 471     code[idx + 1] = template[idx + 1];
 472     code[idx + 2] = template[idx + 2];
 473     __glapi_sparc_icache_flush(&code[idx + 1]);
 474     code[idx + 3] = template[idx + 3];
 475     code[idx + 4] = template[idx + 4];
 476     __glapi_sparc_icache_flush(&code[idx + 3]);
 477     code[idx + 5] = template[idx + 5];
 478     code[idx + 6] = template[idx + 6];
 479     __glapi_sparc_icache_flush(&code[idx + 5]);
 480     code[idx + 7] = template[idx + 7];
 481     code[idx + 8] = template[idx + 8] |
 482             (((call_dest - ((unsigned long) &code[idx + 8]))
 483               >> 2) & 0x3fffffff);
 484     __glapi_sparc_icache_flush(&code[idx + 7]);
 485     code[idx + 9] = template[idx + 9];
 486     code[idx + 10] = template[idx + 10];
 487     __glapi_sparc_icache_flush(&code[idx + 9]);
 488     code[idx + 11] = template[idx + 11];
 489     code[idx + 12] = template[idx + 12];
 490     __glapi_sparc_icache_flush(&code[idx + 11]);
 491     code[idx + 13] = template[idx + 13];
 492     __glapi_sparc_icache_flush(&code[idx + 13]);
 493 #endif
 494 #endif
 495 }
 496 #endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */
 497
 498
 499 /**
 500  * Set the global or per-thread dispatch table pointer.
 501  * If the dispatch parameter is NULL we'll plug in the no-op dispatch
 502  * table (__glapi_noop_table).
 503  */
 504 PUBLIC void
 505 _glapi_set_dispatch(struct _glapi_table *dispatch)
 506 {
 507 #if defined(PTHREADS) || defined(GLX_USE_TLS)
 508    static pthread_once_t once_control = PTHREAD_ONCE_INIT;
 509    pthread_once( & once_control, init_glapi_relocs );
 510 #endif
 511
 512    if (!dispatch) {
 513       /* use the no-op functions */
 514       dispatch = (struct _glapi_table *) __glapi_noop_table;
 515    }
 516 #ifdef DEBUG
 517    else {
 518       _glapi_check_table(dispatch);
 519    }
 520 #endif
 521
 522 #if defined(GLX_USE_TLS)
 523    _glapi_tls_Dispatch = dispatch;
 524 #elif defined(THREADS)
 525    _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
 526    _glapi_Dispatch = (ThreadSafe) ? NULL : dispatch;
 527 #else /*THREADS*/
 528    _glapi_Dispatch = dispatch;
 529 #endif /*THREADS*/
 530 }
 531
 532
 533
 534 /**
 535  * Return pointer to current dispatch table for calling thread.
 536  */
 537 PUBLIC struct _glapi_table *
 538 _glapi_get_dispatch(void)
 539 {
 540    struct _glapi_table * api;
 541 #if defined(GLX_USE_TLS)
 542    api = _glapi_tls_Dispatch;
 543 #elif defined(THREADS)
 544    api = (ThreadSafe)
 545      ? (struct _glapi_table *) _glthread_GetTSD(&_gl_DispatchTSD)
 546      : _glapi_Dispatch;
 547 #else
 548    api = _glapi_Dispatch;
 549 #endif
 550    return api;
 551 }
 552
 553
 554
 555
 556 /*
 557  * The dispatch table size (number of entries) is the size of the
 558  * _glapi_table struct plus the number of dynamic entries we can add.
 559  * The extra slots can be filled in by DRI drivers that register new extension
 560  * functions.
 561  */
 562 #define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
 563
 564
 565 /**
 566  * Return size of dispatch table struct as number of functions (or
 567  * slots).
 568  */
 569 PUBLIC GLuint
 570 _glapi_get_dispatch_table_size(void)
 571 {
 572    return DISPATCH_TABLE_SIZE;
 573 }
 574
 575
 576 /**
 577  * Make sure there are no NULL pointers in the given dispatch table.
 578  * Intended for debugging purposes.
 579  */
 580 void
 581 _glapi_check_table(const struct _glapi_table *table)
 582 {
 583 #ifdef EXTRA_DEBUG
 584    const GLuint entries = _glapi_get_dispatch_table_size();
 585    const void **tab = (const void **) table;
 586    GLuint i;
 587    for (i = 1; i < entries; i++) {
 588       assert(tab[i]);
 589    }
 590
 591    /* Do some spot checks to be sure that the dispatch table
 592     * slots are assigned correctly.
 593     */
 594    {
 595       GLuint BeginOffset = _glapi_get_proc_offset("glBegin");
 596       char *BeginFunc = (char*) &table->Begin;
 597       GLuint offset = (BeginFunc - (char *) table) / sizeof(void *);
 598       assert(BeginOffset == _gloffset_Begin);
 599       assert(BeginOffset == offset);
 600    }
 601    {
 602       GLuint viewportOffset = _glapi_get_proc_offset("glViewport");
 603       char *viewportFunc = (char*) &table->Viewport;
 604       GLuint offset = (viewportFunc - (char *) table) / sizeof(void *);
 605       assert(viewportOffset == _gloffset_Viewport);
 606       assert(viewportOffset == offset);
 607    }
 608    {
 609       GLuint VertexPointerOffset = _glapi_get_proc_offset("glVertexPointer");
 610       char *VertexPointerFunc = (char*) &table->VertexPointer;
 611       GLuint offset = (VertexPointerFunc - (char *) table) / sizeof(void *);
 612       assert(VertexPointerOffset == _gloffset_VertexPointer);
 613       assert(VertexPointerOffset == offset);
 614    }
 615    {
 616       GLuint ResetMinMaxOffset = _glapi_get_proc_offset("glResetMinmax");
 617       char *ResetMinMaxFunc = (char*) &table->ResetMinmax;
 618       GLuint offset = (ResetMinMaxFunc - (char *) table) / sizeof(void *);
 619       assert(ResetMinMaxOffset == _gloffset_ResetMinmax);
 620       assert(ResetMinMaxOffset == offset);
 621    }
 622    {
 623       GLuint blendColorOffset = _glapi_get_proc_offset("glBlendColor");
 624       char *blendColorFunc = (char*) &table->BlendColor;
 625       GLuint offset = (blendColorFunc - (char *) table) / sizeof(void *);
 626       assert(blendColorOffset == _gloffset_BlendColor);
 627       assert(blendColorOffset == offset);
 628    }
 629    {
 630       GLuint secondaryColor3fOffset = _glapi_get_proc_offset("glSecondaryColor3fEXT");
 631       char *secondaryColor3fFunc = (char*) &table->SecondaryColor3fEXT;
 632       GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *);
 633       assert(secondaryColor3fOffset == _gloffset_SecondaryColor3fEXT);
 634       assert(secondaryColor3fOffset == offset);
 635    }
 636    {
 637       GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV");
 638       char *pointParameterivFunc = (char*) &table->PointParameterivNV;
 639       GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *);
 640       assert(pointParameterivOffset == _gloffset_PointParameterivNV);
 641       assert(pointParameterivOffset == offset);
 642    }
 643    {
 644       GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV");
 645       char *setFenceFunc = (char*) &table->SetFenceNV;
 646       GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *);
 647       assert(setFenceOffset == _gloffset_SetFenceNV);
 648       assert(setFenceOffset == offset);
 649    }
 650 #else
 651    (void) table;
 652 #endif
 653 }