3 * Mesa 3-D graphics library
6 * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 * This file manages the OpenGL API dispatch layer.
29 * The dispatch table (struct _glapi_table) is basically just a list
30 * of function pointers.
31 * There are functions to set/get the current dispatch table for the
32 * current thread and to manage registration/dispatch of dynamically
33 * added extension functions.
35 * It's intended that this file and the other glapi*.[ch] files are
36 * flexible enough to be reused in several places: XFree86, DRI-
37 * based libGL.so, and perhaps the SGI SI.
39 * NOTE: There are no dependencies on Mesa in this code.
41 * Versions (API changes):
42 * 2000/02/23 - original version for Mesa 3.3 and XFree86 4.0
43 * 2001/01/16 - added dispatch override feature for Mesa 3.5
44 * 2002/06/28 - added _glapi_set_warning_func(), Mesa 4.1.
45 * 2002/10/01 - _glapi_get_proc_address() will now generate new entrypoints
46 * itself (using offset ~0). _glapi_add_entrypoint() can be
47 * called afterward and it'll fill in the correct dispatch
48 * offset. This allows DRI libGL to avoid probing for DRI
49 * drivers! No changes to the public glapi interface.
56 #include "glapioffsets.h"
57 #include "glapitable.h"
60 /***** BEGIN NO-OP DISPATCH *****/
62 static GLboolean WarnFlag
= GL_FALSE
;
63 static _glapi_warning_func warning_func
;
67 * Enable/disable printing of warning messages.
70 _glapi_noop_enable_warnings(GLboolean enable
)
76 * Register a callback function for reporting errors.
79 _glapi_set_warning_func( _glapi_warning_func func
)
87 if ((WarnFlag
|| getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
97 #define KEYWORD1 static
99 #define NAME(func) NoOp##func
103 #define DISPATCH(func, args, msg) \
105 warning_func(NULL, "GL User Error: called without context:"); \
109 #define RETURN_DISPATCH(func, args, msg) \
111 warning_func(NULL, "GL User Error: called without context:"); \
116 #define DISPATCH_TABLE_NAME __glapi_noop_table
117 #define UNUSED_TABLE_NAME __usused_noop_functions
119 #define TABLE_ENTRY(name) (void *) NoOp##name
121 static int NoOpUnused(void)
124 warning_func(NULL
, "GL User Error: calling extension function without a current context\n");
129 #include "glapitemp.h"
131 /***** END NO-OP DISPATCH *****/
135 /***** BEGIN THREAD-SAFE DISPATCH *****/
136 /* if we support thread-safety, build a special dispatch table for use
137 * in thread-safety mode (ThreadSafe == GL_TRUE). Each entry in the
138 * dispatch table will call _glthread_GetTSD() to get the actual dispatch
139 * table bound to the current thread, then jump through that table.
144 static GLboolean ThreadSafe
= GL_FALSE
; /* In thread-safe mode? */
145 static _glthread_TSD DispatchTSD
; /* Per-thread dispatch pointer */
146 static _glthread_TSD RealDispatchTSD
; /* only when using override */
147 static _glthread_TSD ContextTSD
; /* Per-thread context pointer */
150 #define KEYWORD1 static
151 #define KEYWORD2 GLAPIENTRY
152 #define NAME(func) _ts_##func
154 #define DISPATCH(FUNC, ARGS, MESSAGE) \
155 struct _glapi_table *dispatch; \
156 dispatch = (struct _glapi_table *) _glthread_GetTSD(&DispatchTSD); \
158 dispatch = (struct _glapi_table *) __glapi_noop_table; \
159 (dispatch->FUNC) ARGS
161 #define RETURN_DISPATCH(FUNC, ARGS, MESSAGE) \
162 struct _glapi_table *dispatch; \
163 dispatch = (struct _glapi_table *) _glthread_GetTSD(&DispatchTSD); \
165 dispatch = (struct _glapi_table *) __glapi_noop_table; \
166 return (dispatch->FUNC) ARGS
168 #define DISPATCH_TABLE_NAME __glapi_threadsafe_table
169 #define UNUSED_TABLE_NAME __usused_threadsafe_functions
171 #define TABLE_ENTRY(name) (void *) _ts_##name
173 static int _ts_Unused(void)
178 #include "glapitemp.h"
182 /***** END THREAD-SAFE DISPATCH *****/
186 struct _glapi_table
*_glapi_Dispatch
= (struct _glapi_table
*) __glapi_noop_table
;
187 struct _glapi_table
*_glapi_RealDispatch
= (struct _glapi_table
*) __glapi_noop_table
;
189 /* Used when thread safety disabled */
190 void *_glapi_Context
= NULL
;
193 static GLboolean DispatchOverride
= GL_FALSE
;
197 /* strdup() is actually not a standard ANSI C or POSIX routine.
198 * Irix will not define it if ANSI mode is in effect.
201 str_dup(const char *str
)
204 copy
= (char*) malloc(strlen(str
) + 1);
214 * We should call this periodically from a function such as glXMakeCurrent
215 * in order to test if multiple threads are being used.
218 _glapi_check_multithread(void)
222 static unsigned long knownID
;
223 static GLboolean firstCall
= GL_TRUE
;
225 knownID
= _glthread_GetID();
226 firstCall
= GL_FALSE
;
228 else if (knownID
!= _glthread_GetID()) {
229 ThreadSafe
= GL_TRUE
;
233 /* make sure that this thread's dispatch pointer isn't null */
234 if (!_glapi_get_dispatch()) {
235 _glapi_set_dispatch(NULL
);
244 * Set the current context pointer for this thread.
245 * The context pointer is an opaque type which should be cast to
246 * void from the real context pointer type.
249 _glapi_set_context(void *context
)
252 _glthread_SetTSD(&ContextTSD
, context
);
254 _glapi_Context
= NULL
;
256 _glapi_Context
= context
;
258 _glapi_Context
= context
;
265 * Get the current context pointer for this thread.
266 * The context pointer is an opaque type which should be cast from
267 * void to the real context pointer type.
270 _glapi_get_context(void)
274 return _glthread_GetTSD(&ContextTSD
);
277 return _glapi_Context
;
280 return _glapi_Context
;
287 * Set the global or per-thread dispatch table pointer.
290 _glapi_set_dispatch(struct _glapi_table
*dispatch
)
293 /* use the no-op functions */
294 dispatch
= (struct _glapi_table
*) __glapi_noop_table
;
298 _glapi_check_table(dispatch
);
303 if (DispatchOverride
) {
304 _glthread_SetTSD(&RealDispatchTSD
, (void *) dispatch
);
306 _glapi_RealDispatch
= (struct _glapi_table
*) __glapi_threadsafe_table
;
308 _glapi_RealDispatch
= dispatch
;
311 /* normal operation */
312 _glthread_SetTSD(&DispatchTSD
, (void *) dispatch
);
314 _glapi_Dispatch
= (struct _glapi_table
*) __glapi_threadsafe_table
;
316 _glapi_Dispatch
= dispatch
;
319 if (DispatchOverride
) {
320 _glapi_RealDispatch
= dispatch
;
323 _glapi_Dispatch
= dispatch
;
331 * Return pointer to current dispatch table for calling thread.
333 struct _glapi_table
*
334 _glapi_get_dispatch(void)
338 if (DispatchOverride
) {
339 return (struct _glapi_table
*) _glthread_GetTSD(&RealDispatchTSD
);
342 return (struct _glapi_table
*) _glthread_GetTSD(&DispatchTSD
);
346 if (DispatchOverride
) {
347 assert(_glapi_RealDispatch
);
348 return _glapi_RealDispatch
;
351 assert(_glapi_Dispatch
);
352 return _glapi_Dispatch
;
356 return _glapi_Dispatch
;
362 * Notes on dispatch overrride:
364 * Dispatch override allows an external agent to hook into the GL dispatch
365 * mechanism before execution goes into the core rendering library. For
366 * example, a trace mechanism would insert itself as an overrider, print
367 * logging info for each GL function, then dispatch to the real GL function.
369 * libGLS (GL Stream library) is another agent that might use override.
371 * We don't allow more than one layer of overriding at this time.
372 * In the future we may allow nested/layered override. In that case
373 * _glapi_begin_dispatch_override() will return an override layer,
374 * _glapi_end_dispatch_override(layer) will remove an override layer
375 * and _glapi_get_override_dispatch(layer) will return the dispatch
376 * table for a given override layer. layer = 0 will be the "real"
381 * Return: dispatch override layer number.
384 _glapi_begin_dispatch_override(struct _glapi_table
*override
)
386 struct _glapi_table
*real
= _glapi_get_dispatch();
388 assert(!DispatchOverride
); /* can't nest at this time */
389 DispatchOverride
= GL_TRUE
;
391 _glapi_set_dispatch(real
);
394 _glthread_SetTSD(&DispatchTSD
, (void *) override
);
396 _glapi_Dispatch
= (struct _glapi_table
*) __glapi_threadsafe_table
;
398 _glapi_Dispatch
= override
;
400 _glapi_Dispatch
= override
;
407 _glapi_end_dispatch_override(int layer
)
409 struct _glapi_table
*real
= _glapi_get_dispatch();
411 DispatchOverride
= GL_FALSE
;
412 _glapi_set_dispatch(real
);
413 /* the rest of this isn't needed, just play it safe */
415 _glthread_SetTSD(&RealDispatchTSD
, NULL
);
417 _glapi_RealDispatch
= NULL
;
421 struct _glapi_table
*
422 _glapi_get_override_dispatch(int layer
)
425 return _glapi_get_dispatch();
428 if (DispatchOverride
) {
430 return (struct _glapi_table
*) _glthread_GetTSD(&DispatchTSD
);
432 return _glapi_Dispatch
;
442 struct name_address_offset
{
449 /* The code in this file is auto-generated with Python */
455 * Return dispatch table offset of the named static (built-in) function.
456 * Return -1 if function not found.
459 get_static_proc_offset(const char *funcName
)
462 for (i
= 0; static_functions
[i
].Name
; i
++) {
463 if (strcmp(static_functions
[i
].Name
, funcName
) == 0) {
464 return static_functions
[i
].Offset
;
472 * Return dispatch function address the named static (built-in) function.
473 * Return NULL if function not found.
476 get_static_proc_address(const char *funcName
)
479 for (i
= 0; static_functions
[i
].Name
; i
++) {
480 if (strcmp(static_functions
[i
].Name
, funcName
) == 0) {
481 return static_functions
[i
].Address
;
489 /**********************************************************************
490 * Extension function management.
494 * Number of extension functions which we can dynamically add at runtime.
496 #define MAX_EXTENSION_FUNCS 300
500 * The disptach table size (number of entries) is the sizeof the
501 * _glapi_table struct plus the number of dynamic entries we can add.
502 * The extra slots can be filled in by DRI drivers that register new extension
505 #define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
508 static struct name_address_offset ExtEntryTable
[MAX_EXTENSION_FUNCS
];
509 static GLuint NumExtEntryPoints
= 0;
512 extern void __glapi_sparc_icache_flush(unsigned int *);
516 * Generate a dispatch function (entrypoint) which jumps through
517 * the given slot number (offset) in the current dispatch table.
518 * We need assembly language in order to accomplish this.
521 generate_entrypoint(GLuint functionOffset
)
523 #if defined(USE_X86_ASM)
525 * This x86 code contributed by Josh Vanderhoof.
527 * 0: a1 10 32 54 76 movl __glapi_Dispatch,%eax
529 * 5: 85 c0 testl %eax,%eax
531 * 7: 74 06 je f <entrypoint+0xf>
533 * 9: ff a0 10 32 54 76 jmp *0x76543210(%eax)
535 * f: e8 fc ff ff ff call __glapi_get_dispatch
537 * 14: ff a0 10 32 54 76 jmp *0x76543210(%eax)
540 static const unsigned char insn_template
[] = {
541 0xa1, 0x00, 0x00, 0x00, 0x00,
544 0xff, 0xa0, 0x00, 0x00, 0x00, 0x00,
545 0xe8, 0x00, 0x00, 0x00, 0x00,
546 0xff, 0xa0, 0x00, 0x00, 0x00, 0x00
548 unsigned char *code
= (unsigned char *) malloc(sizeof(insn_template
));
549 unsigned int next_insn
;
551 memcpy(code
, insn_template
, sizeof(insn_template
));
553 *(unsigned int *)(code
+ 0x01) = (unsigned int)&_glapi_Dispatch
;
554 *(unsigned int *)(code
+ 0x0b) = (unsigned int)functionOffset
* 4;
555 next_insn
= (unsigned int)(code
+ 0x14);
556 *(unsigned int *)(code
+ 0x10) = (unsigned int)_glapi_get_dispatch
- next_insn
;
557 *(unsigned int *)(code
+ 0x16) = (unsigned int)functionOffset
* 4;
560 #elif defined(USE_SPARC_ASM)
563 static const unsigned int insn_template
[] = {
564 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */
565 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
566 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */
567 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */
568 0x8528b020, /* sllx %g2, 32, %g2 */
569 0xc2584002, /* ldx [%g1 + %g2], %g1 */
570 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */
571 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */
572 0xc6584002, /* ldx [%g1 + %g2], %g3 */
573 0x81c0c000, /* jmpl %g3, %g0 */
577 static const unsigned int insn_template
[] = {
578 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
579 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
580 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */
581 0x81c0c000, /* jmpl %g3, %g0 */
585 unsigned int *code
= (unsigned int *) malloc(sizeof(insn_template
));
586 unsigned long glapi_addr
= (unsigned long) &_glapi_Dispatch
;
588 memcpy(code
, insn_template
, sizeof(insn_template
));
591 code
[0] |= (glapi_addr
>> (32 + 10));
592 code
[1] |= ((glapi_addr
& 0xffffffff) >> 10);
593 __glapi_sparc_icache_flush(&code
[0]);
594 code
[2] |= ((glapi_addr
>> 32) & ((1 << 10) - 1));
595 code
[3] |= (glapi_addr
& ((1 << 10) - 1));
596 __glapi_sparc_icache_flush(&code
[2]);
597 code
[6] |= ((functionOffset
* 8) >> 10);
598 code
[7] |= ((functionOffset
* 8) & ((1 << 10) - 1));
599 __glapi_sparc_icache_flush(&code
[6]);
601 code
[0] |= (glapi_addr
>> 10);
602 code
[1] |= (glapi_addr
& ((1 << 10) - 1));
603 __glapi_sparc_icache_flush(&code
[0]);
604 code
[2] |= (functionOffset
* 4);
605 __glapi_sparc_icache_flush(&code
[2]);
611 #endif /* USE_*_ASM */
616 * This function inserts a new dispatch offset into the assembly language
617 * stub that was generated with the preceeding function.
620 fill_in_entrypoint_offset(void *entrypoint
, GLuint offset
)
622 #if defined(USE_X86_ASM)
624 unsigned char *code
= (unsigned char *) entrypoint
;
625 *(unsigned int *)(code
+ 0x0b) = offset
* 4;
626 *(unsigned int *)(code
+ 0x16) = offset
* 4;
628 #elif defined(USE_SPARC_ASM)
630 /* XXX this hasn't been tested! */
631 unsigned int *code
= (unsigned int *) entrypoint
;
633 code
[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */
634 code
[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */
635 code
[6] |= ((offset
* 8) >> 10);
636 code
[7] |= ((offset
* 8) & ((1 << 10) - 1));
637 __glapi_sparc_icache_flush(&code
[6]);
638 #else /* __sparc_v9__ */
639 code
[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */
640 code
[2] |= (offset
* 4);
641 __glapi_sparc_icache_flush(&code
[2]);
642 #endif /* __sparc_v9__ */
644 #endif /* USE_*_ASM */
649 * Add a new extension function entrypoint.
650 * Return: GL_TRUE = success or GL_FALSE = failure
653 _glapi_add_entrypoint(const char *funcName
, GLuint offset
)
655 /* trivial rejection test */
656 if (!funcName
|| funcName
[0] != 'g' || funcName
[1] != 'l')
659 /* first check if the named function is already statically present */
661 GLint index
= get_static_proc_offset(funcName
);
663 return (GLboolean
) ((GLuint
) index
== offset
); /* bad offset! */
667 /* See if this function has already been dynamically added */
670 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
671 if (strcmp(ExtEntryTable
[i
].Name
, funcName
) == 0) {
672 /* function already registered */
673 if (ExtEntryTable
[i
].Offset
== offset
) {
674 return GL_TRUE
; /* offsets match */
676 else if (ExtEntryTable
[i
].Offset
== (GLuint
) ~0
677 && offset
< DISPATCH_TABLE_SIZE
) {
678 /* need to patch-up the dispatch code */
679 if (offset
!= (GLuint
) ~0) {
680 fill_in_entrypoint_offset(ExtEntryTable
[i
].Address
, offset
);
681 ExtEntryTable
[i
].Offset
= offset
;
686 return GL_FALSE
; /* bad offset! */
692 /* This is a new function, try to add it. */
693 if (NumExtEntryPoints
>= MAX_EXTENSION_FUNCS
||
694 offset
>= DISPATCH_TABLE_SIZE
) {
699 void *entrypoint
= generate_entrypoint(offset
);
701 return GL_FALSE
; /* couldn't generate assembly */
704 ExtEntryTable
[NumExtEntryPoints
].Name
= str_dup(funcName
);
705 ExtEntryTable
[NumExtEntryPoints
].Offset
= offset
;
706 ExtEntryTable
[NumExtEntryPoints
].Address
= entrypoint
;
709 return GL_TRUE
; /* success */
712 /* should never get here, silence compiler warnings */
718 * Return offset of entrypoint for named function within dispatch table.
721 _glapi_get_proc_offset(const char *funcName
)
723 /* search extension functions first */
725 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
726 if (strcmp(ExtEntryTable
[i
].Name
, funcName
) == 0) {
727 return ExtEntryTable
[i
].Offset
;
731 /* search static functions */
732 return get_static_proc_offset(funcName
);
738 * Return entrypoint for named function.
741 _glapi_get_proc_address(const char *funcName
)
745 if (funcName
[0] != 'g' || funcName
[1] != 'l')
748 /* search extension functions first */
749 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
750 if (strcmp(ExtEntryTable
[i
].Name
, funcName
) == 0) {
751 return ExtEntryTable
[i
].Address
;
755 /* search static functions */
757 const GLvoid
*func
= get_static_proc_address(funcName
);
762 /* generate new entrypoint - use a temporary dispatch offset of
763 * ~0 (i.e. -1). Later, when the driver calls _glapi_add_entrypoint()
764 * we'll put in the proper offset. If that never happens, and the
765 * user calls this function, he'll segfault. That's what you get
766 * when you try calling a GL function that doesn't really exist.
768 if (NumExtEntryPoints
< MAX_EXTENSION_FUNCS
) {
769 GLvoid
*entrypoint
= generate_entrypoint(~0);
773 ExtEntryTable
[NumExtEntryPoints
].Name
= str_dup(funcName
);
774 ExtEntryTable
[NumExtEntryPoints
].Offset
= ~0;
775 ExtEntryTable
[NumExtEntryPoints
].Address
= entrypoint
;
781 /* no space for new functions! */
789 * Return the name of the function at the given dispatch offset.
790 * This is only intended for debugging.
793 _glapi_get_proc_name(GLuint offset
)
795 const GLuint n
= sizeof(static_functions
) / sizeof(struct name_address_offset
);
798 /* search built-in functions */
799 for (i
= 0; i
< n
; i
++) {
800 if (static_functions
[i
].Offset
== offset
)
801 return static_functions
[i
].Name
;
804 /* search added extension functions */
805 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
806 if (ExtEntryTable
[i
].Offset
== offset
) {
807 return ExtEntryTable
[i
].Name
;
816 * Return size of dispatch table struct as number of functions (or
820 _glapi_get_dispatch_table_size(void)
822 return DISPATCH_TABLE_SIZE
;
828 * Get API dispatcher version string.
831 _glapi_get_version(void)
833 return "20021001"; /* YYYYMMDD */
839 * Make sure there are no NULL pointers in the given dispatch table.
840 * Intended for debugging purposes.
843 _glapi_check_table(const struct _glapi_table
*table
)
846 const GLuint entries
= _glapi_get_dispatch_table_size();
847 const void **tab
= (const void **) table
;
849 for (i
= 1; i
< entries
; i
++) {
853 /* Do some spot checks to be sure that the dispatch table
854 * slots are assigned correctly.
857 GLuint BeginOffset
= _glapi_get_proc_offset("glBegin");
858 char *BeginFunc
= (char*) &table
->Begin
;
859 GLuint offset
= (BeginFunc
- (char *) table
) / sizeof(void *);
860 assert(BeginOffset
== _gloffset_Begin
);
861 assert(BeginOffset
== offset
);
864 GLuint viewportOffset
= _glapi_get_proc_offset("glViewport");
865 char *viewportFunc
= (char*) &table
->Viewport
;
866 GLuint offset
= (viewportFunc
- (char *) table
) / sizeof(void *);
867 assert(viewportOffset
== _gloffset_Viewport
);
868 assert(viewportOffset
== offset
);
871 GLuint VertexPointerOffset
= _glapi_get_proc_offset("glVertexPointer");
872 char *VertexPointerFunc
= (char*) &table
->VertexPointer
;
873 GLuint offset
= (VertexPointerFunc
- (char *) table
) / sizeof(void *);
874 assert(VertexPointerOffset
== _gloffset_VertexPointer
);
875 assert(VertexPointerOffset
== offset
);
878 GLuint ResetMinMaxOffset
= _glapi_get_proc_offset("glResetMinmax");
879 char *ResetMinMaxFunc
= (char*) &table
->ResetMinmax
;
880 GLuint offset
= (ResetMinMaxFunc
- (char *) table
) / sizeof(void *);
881 assert(ResetMinMaxOffset
== _gloffset_ResetMinmax
);
882 assert(ResetMinMaxOffset
== offset
);
885 GLuint blendColorOffset
= _glapi_get_proc_offset("glBlendColor");
886 char *blendColorFunc
= (char*) &table
->BlendColor
;
887 GLuint offset
= (blendColorFunc
- (char *) table
) / sizeof(void *);
888 assert(blendColorOffset
== _gloffset_BlendColor
);
889 assert(blendColorOffset
== offset
);
892 GLuint istextureOffset
= _glapi_get_proc_offset("glIsTextureEXT");
893 char *istextureFunc
= (char*) &table
->IsTextureEXT
;
894 GLuint offset
= (istextureFunc
- (char *) table
) / sizeof(void *);
895 assert(istextureOffset
== _gloffset_IsTextureEXT
);
896 assert(istextureOffset
== offset
);
899 GLuint secondaryColor3fOffset
= _glapi_get_proc_offset("glSecondaryColor3fEXT");
900 char *secondaryColor3fFunc
= (char*) &table
->SecondaryColor3fEXT
;
901 GLuint offset
= (secondaryColor3fFunc
- (char *) table
) / sizeof(void *);
902 assert(secondaryColor3fOffset
== _gloffset_SecondaryColor3fEXT
);
903 assert(secondaryColor3fOffset
== offset
);
904 assert(_glapi_get_proc_address("glSecondaryColor3fEXT") == (void *) &glSecondaryColor3fEXT
);
907 GLuint pointParameterivOffset
= _glapi_get_proc_offset("glPointParameterivNV");
908 char *pointParameterivFunc
= (char*) &table
->PointParameterivNV
;
909 GLuint offset
= (pointParameterivFunc
- (char *) table
) / sizeof(void *);
910 assert(pointParameterivOffset
== _gloffset_PointParameterivNV
);
911 assert(pointParameterivOffset
== offset
);
912 assert(_glapi_get_proc_address("glPointParameterivNV") == (void *) &glPointParameterivNV
);
915 GLuint setFenceOffset
= _glapi_get_proc_offset("glSetFenceNV");
916 char *setFenceFunc
= (char*) &table
->SetFenceNV
;
917 GLuint offset
= (setFenceFunc
- (char *) table
) / sizeof(void *);
918 assert(setFenceOffset
== _gloffset_SetFenceNV
);
919 assert(setFenceOffset
== offset
);
920 assert(_glapi_get_proc_address("glSetFenceNV") == (void *) &glSetFenceNV
);