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