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