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 _glthread_DECLARE_STATIC_MUTEX(ThreadCheckMutex);
 202 static GLboolean ThreadSafe = GL_FALSE;  /**< In thread-safe mode? */
 203 _glthread_TSD _gl_DispatchTSD;           /**< Per-thread dispatch pointer */
 204 static _glthread_TSD ContextTSD;         /**< Per-thread context pointer */
 205
 206 #if defined(WIN32_THREADS)
 207 void FreeTSD(_glthread_TSD *p);
 208 void FreeAllTSD(void)
 209 {
 210    FreeTSD(&_gl_DispatchTSD);
 211    FreeTSD(&ContextTSD);
 212 }
 213 #endif /* defined(WIN32_THREADS) */
 214
 215 #endif /* defined(THREADS) */
 216
 217 PUBLIC struct _glapi_table *_glapi_Dispatch =
 218   (struct _glapi_table *) __glapi_noop_table;
 219 PUBLIC void *_glapi_Context = NULL;
 220
 221 #endif /* defined(GLX_USE_TLS) */
 222 /*@}*/
 223
 224
 225
 226
 227 /**
 228  * We should call this periodically from a function such as glXMakeCurrent
 229  * in order to test if multiple threads are being used.
 230  */
 231 void
 232 _glapi_check_multithread(void)
 233 {
 234 #if defined(THREADS) && !defined(GLX_USE_TLS)
 235    static unsigned long knownID;
 236    static GLboolean firstCall = GL_TRUE;
 237
 238    if (ThreadSafe)
 239       return;
 240
 241    _glthread_LOCK_MUTEX(ThreadCheckMutex);
 242    if (firstCall) {
 243       knownID = _glthread_GetID();
 244       firstCall = GL_FALSE;
 245    }
 246    else if (knownID != _glthread_GetID()) {
 247       ThreadSafe = GL_TRUE;
 248       _glapi_set_dispatch(NULL);
 249       _glapi_set_context(NULL);
 250    }
 251    _glthread_UNLOCK_MUTEX(ThreadCheckMutex);
 252 #endif
 253 }
 254
 255
 256
 257 /**
 258  * Set the current context pointer for this thread.
 259  * The context pointer is an opaque type which should be cast to
 260  * void from the real context pointer type.
 261  */
 262 PUBLIC void
 263 _glapi_set_context(void *context)
 264 {
 265    (void) __unused_noop_functions; /* silence a warning */
 266 #if defined(GLX_USE_TLS)
 267    _glapi_tls_Context = context;
 268 #elif defined(THREADS)
 269    _glthread_SetTSD(&ContextTSD, context);
 270    _glapi_Context = (ThreadSafe) ? NULL : context;
 271 #else
 272    _glapi_Context = context;
 273 #endif
 274 }
 275
 276
 277
 278 /**
 279  * Get the current context pointer for this thread.
 280  * The context pointer is an opaque type which should be cast from
 281  * void to the real context pointer type.
 282  */
 283 PUBLIC void *
 284 _glapi_get_context(void)
 285 {
 286 #if defined(GLX_USE_TLS)
 287    return _glapi_tls_Context;
 288 #elif defined(THREADS)
 289    if (ThreadSafe) {
 290       return _glthread_GetTSD(&ContextTSD);
 291    }
 292    else {
 293       return _glapi_Context;
 294    }
 295 #else
 296    return _glapi_Context;
 297 #endif
 298 }
 299
 300 #ifdef USE_X86_ASM
 301
 302 #if defined( GLX_USE_TLS )
 303 extern       GLubyte gl_dispatch_functions_start[];
 304 extern       GLubyte gl_dispatch_functions_end[];
 305 #else
 306 extern const GLubyte gl_dispatch_functions_start[];
 307 #endif
 308
 309 #endif /* USE_X86_ASM */
 310
 311
 312 #if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)
 313 # define DISPATCH_FUNCTION_SIZE  16
 314 #elif defined(USE_X86_ASM)
 315 # if defined(THREADS) && !defined(GLX_USE_TLS)
 316 #  define DISPATCH_FUNCTION_SIZE  32
 317 # else
 318 #  define DISPATCH_FUNCTION_SIZE  16
 319 # endif
 320 #endif
 321
 322 #ifdef USE_SPARC_ASM
 323 #ifdef GLX_USE_TLS
 324 extern unsigned int __glapi_sparc_tls_stub;
 325 #else
 326 extern unsigned int __glapi_sparc_pthread_stub;
 327 #endif
 328 #endif
 329
 330 #if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer)
 331 # define NEED_FUNCTION_POINTER
 332 #endif
 333
 334 #if defined(PTHREADS) || defined(GLX_USE_TLS)
 335 /**
 336  * Perform platform-specific GL API entry-point fixups.
 337  */
 338 static void
 339 init_glapi_relocs( void )
 340 {
 341 #if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
 342     extern unsigned long _x86_get_dispatch(void);
 343     char run_time_patch[] = {
 344        0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
 345     };
 346     GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
 347     const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
 348     GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
 349
 350     *offset = _x86_get_dispatch();
 351     while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
 352         (void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
 353         curr_func += DISPATCH_FUNCTION_SIZE;
 354     }
 355 #endif
 356 #ifdef USE_SPARC_ASM
 357     extern void __glapi_sparc_icache_flush(unsigned int *);
 358     static const unsigned int template[] = {
 359 #ifdef GLX_USE_TLS
 360         0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */
 361         0x8730e00a, /* srl %g3, 10, %g3 */
 362         0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */
 363 #ifdef __arch64__
 364         0xc259c002, /* ldx [%g7 + %g2], %g1 */
 365         0xc2584003, /* ldx [%g1 + %g3], %g1 */
 366 #else
 367         0xc201c002, /* ld [%g7 + %g2], %g1 */
 368         0xc2004003, /* ld [%g1 + %g3], %g1 */
 369 #endif
 370         0x81c04000, /* jmp %g1 */
 371         0x01000000, /* nop  */
 372 #else
 373 #ifdef __arch64__
 374         0x03000000, /* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */
 375         0x05000000, /* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */
 376         0x82106000, /* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */
 377         0x8730e00a, /* 64-bit 0x0c --> srl %g3, 10, %g3 */
 378         0x83287020, /* 64-bit 0x10 --> sllx %g1, 32, %g1 */
 379         0x82004002, /* 64-bit 0x14 --> add %g1, %g2, %g1 */
 380         0xc2586000, /* 64-bit 0x18 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */
 381 #else
 382         0x03000000, /* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */
 383         0x8730e00a, /* 32-bit 0x04 --> srl %g3, 10, %g3 */
 384         0xc2006000, /* 32-bit 0x08 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
 385 #endif
 386         0x80a06000, /*             --> cmp %g1, 0 */
 387         0x02800005, /*             --> be +4*5 */
 388         0x01000000, /*             -->  nop  */
 389 #ifdef __arch64__
 390         0xc2584003, /* 64-bit      --> ldx [%g1 + %g3], %g1 */
 391 #else
 392         0xc2004003, /* 32-bit      --> ld [%g1 + %g3], %g1 */
 393 #endif
 394         0x81c04000, /*             --> jmp %g1 */
 395         0x01000000, /*             --> nop  */
 396 #ifdef __arch64__
 397         0x9de3bf80, /* 64-bit      --> save  %sp, -128, %sp */
 398 #else
 399         0x9de3bfc0, /* 32-bit      --> save  %sp, -64, %sp */
 400 #endif
 401         0xa0100003, /*             --> mov  %g3, %l0 */
 402         0x40000000, /*             --> call _glapi_get_dispatch */
 403         0x01000000, /*             -->  nop */
 404         0x82100008, /*             --> mov %o0, %g1 */
 405         0x86100010, /*             --> mov %l0, %g3 */
 406         0x10bffff7, /*             --> ba -4*9 */
 407         0x81e80000, /*             -->  restore  */
 408 #endif
 409     };
 410 #ifdef GLX_USE_TLS
 411     extern unsigned long __glapi_sparc_get_dispatch(void);
 412     unsigned int *code = &__glapi_sparc_tls_stub;
 413     unsigned long dispatch = __glapi_sparc_get_dispatch();
 414 #else
 415     unsigned int *code = &__glapi_sparc_pthread_stub;
 416     unsigned long dispatch = (unsigned long) &_glapi_Dispatch;
 417     unsigned long call_dest = (unsigned long ) &_glapi_get_dispatch;
 418     int idx;
 419 #endif
 420
 421 #if defined(GLX_USE_TLS)
 422     code[0] = template[0] | (dispatch >> 10);
 423     code[1] = template[1];
 424     __glapi_sparc_icache_flush(&code[0]);
 425     code[2] = template[2] | (dispatch & 0x3ff);
 426     code[3] = template[3];
 427     __glapi_sparc_icache_flush(&code[2]);
 428     code[4] = template[4];
 429     code[5] = template[5];
 430     __glapi_sparc_icache_flush(&code[4]);
 431     code[6] = template[6];
 432     __glapi_sparc_icache_flush(&code[6]);
 433 #else
 434 #if defined(__arch64__)
 435     code[0] = template[0] | (dispatch >> (32 + 10));
 436     code[1] = template[1] | ((dispatch & 0xffffffff) >> 10);
 437     __glapi_sparc_icache_flush(&code[0]);
 438     code[2] = template[2] | ((dispatch >> 32) & 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] | (dispatch & 0x3ff);
 445     idx = 7;
 446 #else
 447     code[0] = template[0] | (dispatch >> 10);
 448     code[1] = template[1];
 449     __glapi_sparc_icache_flush(&code[0]);
 450     code[2] = template[2] | (dispatch & 0x3ff);
 451     idx = 3;
 452 #endif
 453     code[idx + 0] = template[idx + 0];
 454     __glapi_sparc_icache_flush(&code[idx - 1]);
 455     code[idx + 1] = template[idx + 1];
 456     code[idx + 2] = template[idx + 2];
 457     __glapi_sparc_icache_flush(&code[idx + 1]);
 458     code[idx + 3] = template[idx + 3];
 459     code[idx + 4] = template[idx + 4];
 460     __glapi_sparc_icache_flush(&code[idx + 3]);
 461     code[idx + 5] = template[idx + 5];
 462     code[idx + 6] = template[idx + 6];
 463     __glapi_sparc_icache_flush(&code[idx + 5]);
 464     code[idx + 7] = template[idx + 7];
 465     code[idx + 8] = template[idx + 8] |
 466             (((call_dest - ((unsigned long) &code[idx + 8]))
 467               >> 2) & 0x3fffffff);
 468     __glapi_sparc_icache_flush(&code[idx + 7]);
 469     code[idx + 9] = template[idx + 9];
 470     code[idx + 10] = template[idx + 10];
 471     __glapi_sparc_icache_flush(&code[idx + 9]);
 472     code[idx + 11] = template[idx + 11];
 473     code[idx + 12] = template[idx + 12];
 474     __glapi_sparc_icache_flush(&code[idx + 11]);
 475     code[idx + 13] = template[idx + 13];
 476     __glapi_sparc_icache_flush(&code[idx + 13]);
 477 #endif
 478 #endif
 479 }
 480 #endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */
 481
 482
 483 /**
 484  * Set the global or per-thread dispatch table pointer.
 485  * If the dispatch parameter is NULL we'll plug in the no-op dispatch
 486  * table (__glapi_noop_table).
 487  */
 488 PUBLIC void
 489 _glapi_set_dispatch(struct _glapi_table *dispatch)
 490 {
 491 #if defined(PTHREADS) || defined(GLX_USE_TLS)
 492    static pthread_once_t once_control = PTHREAD_ONCE_INIT;
 493    pthread_once( & once_control, init_glapi_relocs );
 494 #endif
 495
 496    if (!dispatch) {
 497       /* use the no-op functions */
 498       dispatch = (struct _glapi_table *) __glapi_noop_table;
 499    }
 500 #ifdef DEBUG
 501    else {
 502       _glapi_check_table(dispatch);
 503    }
 504 #endif
 505
 506 #if defined(GLX_USE_TLS)
 507    _glapi_tls_Dispatch = dispatch;
 508 #elif defined(THREADS)
 509    _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
 510    _glapi_Dispatch = (ThreadSafe) ? NULL : dispatch;
 511 #else /*THREADS*/
 512    _glapi_Dispatch = dispatch;
 513 #endif /*THREADS*/
 514 }
 515
 516
 517
 518 /**
 519  * Return pointer to current dispatch table for calling thread.
 520  */
 521 PUBLIC struct _glapi_table *
 522 _glapi_get_dispatch(void)
 523 {
 524    struct _glapi_table * api;
 525 #if defined(GLX_USE_TLS)
 526    api = _glapi_tls_Dispatch;
 527 #elif defined(THREADS)
 528    api = (ThreadSafe)
 529      ? (struct _glapi_table *) _glthread_GetTSD(&_gl_DispatchTSD)
 530      : _glapi_Dispatch;
 531 #else
 532    api = _glapi_Dispatch;
 533 #endif
 534    return api;
 535 }
 536
 537
 538
 539
 540 /*
 541  * The dispatch table size (number of entries) is the size of the
 542  * _glapi_table struct plus the number of dynamic entries we can add.
 543  * The extra slots can be filled in by DRI drivers that register new extension
 544  * functions.
 545  */
 546 #define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
 547
 548
 549 /**
 550  * Return size of dispatch table struct as number of functions (or
 551  * slots).
 552  */
 553 PUBLIC GLuint
 554 _glapi_get_dispatch_table_size(void)
 555 {
 556    return DISPATCH_TABLE_SIZE;
 557 }
 558
 559
 560 /**
 561  * Make sure there are no NULL pointers in the given dispatch table.
 562  * Intended for debugging purposes.
 563  */
 564 void
 565 _glapi_check_table(const struct _glapi_table *table)
 566 {
 567 #ifdef EXTRA_DEBUG
 568    const GLuint entries = _glapi_get_dispatch_table_size();
 569    const void **tab = (const void **) table;
 570    GLuint i;
 571    for (i = 1; i < entries; i++) {
 572       assert(tab[i]);
 573    }
 574
 575    /* Do some spot checks to be sure that the dispatch table
 576     * slots are assigned correctly.
 577     */
 578    {
 579       GLuint BeginOffset = _glapi_get_proc_offset("glBegin");
 580       char *BeginFunc = (char*) &table->Begin;
 581       GLuint offset = (BeginFunc - (char *) table) / sizeof(void *);
 582       assert(BeginOffset == _gloffset_Begin);
 583       assert(BeginOffset == offset);
 584    }
 585    {
 586       GLuint viewportOffset = _glapi_get_proc_offset("glViewport");
 587       char *viewportFunc = (char*) &table->Viewport;
 588       GLuint offset = (viewportFunc - (char *) table) / sizeof(void *);
 589       assert(viewportOffset == _gloffset_Viewport);
 590       assert(viewportOffset == offset);
 591    }
 592    {
 593       GLuint VertexPointerOffset = _glapi_get_proc_offset("glVertexPointer");
 594       char *VertexPointerFunc = (char*) &table->VertexPointer;
 595       GLuint offset = (VertexPointerFunc - (char *) table) / sizeof(void *);
 596       assert(VertexPointerOffset == _gloffset_VertexPointer);
 597       assert(VertexPointerOffset == offset);
 598    }
 599    {
 600       GLuint ResetMinMaxOffset = _glapi_get_proc_offset("glResetMinmax");
 601       char *ResetMinMaxFunc = (char*) &table->ResetMinmax;
 602       GLuint offset = (ResetMinMaxFunc - (char *) table) / sizeof(void *);
 603       assert(ResetMinMaxOffset == _gloffset_ResetMinmax);
 604       assert(ResetMinMaxOffset == offset);
 605    }
 606    {
 607       GLuint blendColorOffset = _glapi_get_proc_offset("glBlendColor");
 608       char *blendColorFunc = (char*) &table->BlendColor;
 609       GLuint offset = (blendColorFunc - (char *) table) / sizeof(void *);
 610       assert(blendColorOffset == _gloffset_BlendColor);
 611       assert(blendColorOffset == offset);
 612    }
 613    {
 614       GLuint secondaryColor3fOffset = _glapi_get_proc_offset("glSecondaryColor3fEXT");
 615       char *secondaryColor3fFunc = (char*) &table->SecondaryColor3fEXT;
 616       GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *);
 617       assert(secondaryColor3fOffset == _gloffset_SecondaryColor3fEXT);
 618       assert(secondaryColor3fOffset == offset);
 619    }
 620    {
 621       GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV");
 622       char *pointParameterivFunc = (char*) &table->PointParameterivNV;
 623       GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *);
 624       assert(pointParameterivOffset == _gloffset_PointParameterivNV);
 625       assert(pointParameterivOffset == offset);
 626    }
 627    {
 628       GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV");
 629       char *setFenceFunc = (char*) &table->SetFenceNV;
 630       GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *);
 631       assert(setFenceOffset == _gloffset_SetFenceNV);
 632       assert(setFenceOffset == offset);
 633    }
 634 #else
 635    (void) table;
 636 #endif
 637 }