2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
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.
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.
38 * NOTE: There are no dependencies on Mesa in this code.
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.
55 #include "glapioffsets.h"
56 #include "glapitable.h"
58 /***** BEGIN NO-OP DISPATCH *****/
60 static GLboolean WarnFlag
= GL_FALSE
;
61 static _glapi_warning_func warning_func
;
63 static void init_glapi_relocs(void);
65 static _glapi_proc
generate_entrypoint(GLuint functionOffset
);
66 static void fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
);
69 * Enable/disable printing of warning messages.
72 _glapi_noop_enable_warnings(GLboolean enable
)
78 * Register a callback function for reporting errors.
81 _glapi_set_warning_func( _glapi_warning_func func
)
89 if ((WarnFlag
|| getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
99 #define KEYWORD1 static
100 #define KEYWORD2 GLAPIENTRY
101 #define NAME(func) NoOp##func
105 #define DISPATCH(func, args, msg) \
107 warning_func(NULL, "GL User Error: called without context: %s", #func); \
110 #define RETURN_DISPATCH(func, args, msg) \
112 warning_func(NULL, "GL User Error: called without context: %s", #func); \
116 #define DISPATCH_TABLE_NAME __glapi_noop_table
117 #define UNUSED_TABLE_NAME __unused_noop_functions
119 #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
121 static GLint
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 *****/
136 * \name Current dispatch and current context control variables
138 * Depending on whether or not multithreading is support, and the type of
139 * support available, several variables are used to store the current context
140 * pointer and the current dispatch table pointer. In the non-threaded case,
141 * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this
144 * In the "normal" threaded case, the variables \c _glapi_Dispatch and
145 * \c _glapi_Context will be \c NULL if an application is detected as being
146 * multithreaded. Single-threaded applications will use \c _glapi_Dispatch
147 * and \c _glapi_Context just like the case without any threading support.
148 * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state
149 * data \c _gl_DispatchTSD and \c ContextTSD are used. Drivers and the
150 * static dispatch functions access these variables via \c _glapi_get_dispatch
151 * and \c _glapi_get_context.
153 * There is a race condition in setting \c _glapi_Dispatch to \c NULL. It is
154 * possible for the original thread to be setting it at the same instant a new
155 * thread, perhaps running on a different processor, is clearing it. Because
156 * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is
157 * used to determine whether or not the application is multithreaded.
159 * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are
160 * hardcoded to \c NULL. Instead the TLS variables \c _glapi_tls_Dispatch and
161 * \c _glapi_tls_Context are used. Having \c _glapi_Dispatch and
162 * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability
163 * between TLS enabled loaders and non-TLS DRI drivers.
166 #if defined(GLX_USE_TLS)
168 PUBLIC __thread
struct _glapi_table
* _glapi_tls_Dispatch
169 __attribute__((tls_model("initial-exec")))
170 = (struct _glapi_table
*) __glapi_noop_table
;
172 PUBLIC __thread
void * _glapi_tls_Context
173 __attribute__((tls_model("initial-exec")));
175 PUBLIC
const struct _glapi_table
*_glapi_Dispatch
= NULL
;
176 PUBLIC
const void *_glapi_Context
= NULL
;
182 static GLboolean ThreadSafe
= GL_FALSE
; /**< In thread-safe mode? */
183 _glthread_TSD _gl_DispatchTSD
; /**< Per-thread dispatch pointer */
184 static _glthread_TSD ContextTSD
; /**< Per-thread context pointer */
186 #endif /* defined(THREADS) */
188 PUBLIC
struct _glapi_table
*_glapi_Dispatch
=
189 (struct _glapi_table
*) __glapi_noop_table
;
190 PUBLIC
void *_glapi_Context
= NULL
;
192 #endif /* defined(GLX_USE_TLS) */
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)
220 #if defined(THREADS) && !defined(GLX_USE_TLS)
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
;
230 _glapi_set_dispatch(NULL
);
233 else if (!_glapi_get_dispatch()) {
234 /* make sure that this thread's dispatch pointer isn't null */
235 _glapi_set_dispatch(NULL
);
243 * Set the current context pointer for this thread.
244 * The context pointer is an opaque type which should be cast to
245 * void from the real context pointer type.
248 _glapi_set_context(void *context
)
250 (void) __unused_noop_functions
; /* silence a warning */
251 #if defined(GLX_USE_TLS)
252 _glapi_tls_Context
= context
;
253 #elif defined(THREADS)
254 _glthread_SetTSD(&ContextTSD
, context
);
255 _glapi_Context
= (ThreadSafe
) ? NULL
: context
;
257 _glapi_Context
= context
;
264 * Get the current context pointer for this thread.
265 * The context pointer is an opaque type which should be cast from
266 * void to the real context pointer type.
269 _glapi_get_context(void)
271 #if defined(GLX_USE_TLS)
272 return _glapi_tls_Context
;
273 #elif defined(THREADS)
275 return _glthread_GetTSD(&ContextTSD
);
278 return _glapi_Context
;
281 return _glapi_Context
;
288 * Set the global or per-thread dispatch table pointer.
289 * If the dispatch parameter is NULL we'll plug in the no-op dispatch
290 * table (__glapi_noop_table).
293 _glapi_set_dispatch(struct _glapi_table
*dispatch
)
295 #if defined(PTHREADS) || defined(GLX_USE_TLS)
296 static pthread_once_t once_control
= PTHREAD_ONCE_INIT
;
297 pthread_once( & once_control
, init_glapi_relocs
);
301 /* use the no-op functions */
302 dispatch
= (struct _glapi_table
*) __glapi_noop_table
;
306 _glapi_check_table(dispatch
);
310 #if defined(GLX_USE_TLS)
311 _glapi_tls_Dispatch
= dispatch
;
312 #elif defined(THREADS)
313 _glthread_SetTSD(&_gl_DispatchTSD
, (void *) dispatch
);
314 _glapi_Dispatch
= (ThreadSafe
) ? NULL
: dispatch
;
316 _glapi_Dispatch
= dispatch
;
323 * Return pointer to current dispatch table for calling thread.
325 PUBLIC
struct _glapi_table
*
326 _glapi_get_dispatch(void)
328 struct _glapi_table
* api
;
329 #if defined(GLX_USE_TLS)
330 api
= _glapi_tls_Dispatch
;
331 #elif defined(THREADS)
333 ? (struct _glapi_table
*) _glthread_GetTSD(&_gl_DispatchTSD
)
336 api
= _glapi_Dispatch
;
344 *** The rest of this file is pretty much concerned with GetProcAddress
348 #if !defined( USE_X86_ASM ) && !defined( XFree86Server ) && !defined ( XGLServer )
349 #define NEED_FUNCTION_POINTER
352 /* The code in this file is auto-generated with Python */
357 * Search the table of static entrypoint functions for the named function
358 * and return the corresponding glprocs_table_t entry.
360 static const glprocs_table_t
*
361 find_entry( const char * n
)
364 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
365 const char *testName
= gl_string_table
+ static_functions
[i
].Name_offset
;
366 if (strcmp(testName
, n
) == 0) {
367 return &static_functions
[i
];
375 * Return dispatch table offset of the named static (built-in) function.
376 * Return -1 if function not found.
379 get_static_proc_offset(const char *funcName
)
381 const glprocs_table_t
* const f
= find_entry( funcName
);
389 #if !defined(XFree86Server) && !defined(XGLServer)
392 #if defined( GLX_USE_TLS )
393 extern GLubyte gl_dispatch_functions_start
[];
394 extern GLubyte gl_dispatch_functions_end
[];
396 extern const GLubyte gl_dispatch_functions_start
[];
399 # if defined(THREADS) && !defined(GLX_USE_TLS)
400 # define X86_DISPATCH_FUNCTION_SIZE 32
402 # define X86_DISPATCH_FUNCTION_SIZE 16
405 #endif /* USE_X86_ASM */
409 * Return dispatch function address for the named static (built-in) function.
410 * Return NULL if function not found.
412 static const _glapi_proc
413 get_static_proc_address(const char *funcName
)
415 const glprocs_table_t
* const f
= find_entry( funcName
);
418 return (_glapi_proc
) (gl_dispatch_functions_start
419 + (X86_DISPATCH_FUNCTION_SIZE
* f
->Offset
));
429 #endif /* !defined(XFree86Server) && !defined(XGLServer) */
434 * Return the name of the function at the given offset in the dispatch
435 * table. For debugging only.
438 get_static_proc_name( GLuint offset
)
441 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
442 if (static_functions
[i
].Offset
== offset
) {
443 return gl_string_table
+ static_functions
[i
].Name_offset
;
451 /**********************************************************************
452 * Extension function management.
456 * Number of extension functions which we can dynamically add at runtime.
458 #define MAX_EXTENSION_FUNCS 300
462 * The dispatch table size (number of entries) is the size of the
463 * _glapi_table struct plus the number of dynamic entries we can add.
464 * The extra slots can be filled in by DRI drivers that register new extension
467 #define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
471 * Track information about a function added to the GL API.
473 struct _glapi_function
{
475 * Name of the function.
481 * Text string that describes the types of the parameters passed to the
482 * named function. Parameter types are converted to characters using the
484 * - 'i' for \c GLint, \c GLuint, and \c GLenum
485 * - 'p' for any pointer type
486 * - 'f' for \c GLfloat and \c GLclampf
487 * - 'd' for \c GLdouble and \c GLclampd
489 const char * parameter_signature
;
493 * Offset in the dispatch table where the pointer to the real function is
494 * located. If the driver has not requested that the named function be
495 * added to the dispatch table, this will have the value ~0.
497 unsigned dispatch_offset
;
501 * Pointer to the dispatch stub for the named function.
504 * The semantic of this field should be changed slightly. Currently, it
505 * is always expected to be non-\c NULL. However, it would be better to
506 * only allocate the entry-point stub when the application requests the
507 * function via \c glXGetProcAddress. This would save memory for all the
508 * functions that the driver exports but that the application never wants
511 _glapi_proc dispatch_stub
;
515 static struct _glapi_function ExtEntryTable
[MAX_EXTENSION_FUNCS
];
516 static GLuint NumExtEntryPoints
= 0;
519 extern void __glapi_sparc_icache_flush(unsigned int *);
523 * Generate a dispatch function (entrypoint) which jumps through
524 * the given slot number (offset) in the current dispatch table.
525 * We need assembly language in order to accomplish this.
528 generate_entrypoint(GLuint functionOffset
)
530 #if defined(USE_X86_ASM)
531 /* 32 is chosen as something of a magic offset. For x86, the dispatch
532 * at offset 32 is the first one where the offset in the
533 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
535 const GLubyte
* const template_func
= gl_dispatch_functions_start
536 + (X86_DISPATCH_FUNCTION_SIZE
* 32);
537 GLubyte
* const code
= (GLubyte
*) malloc( X86_DISPATCH_FUNCTION_SIZE
);
540 if ( code
!= NULL
) {
541 (void) memcpy( code
, template_func
, X86_DISPATCH_FUNCTION_SIZE
);
542 fill_in_entrypoint_offset( (_glapi_proc
) code
, functionOffset
);
545 return (_glapi_proc
) code
;
546 #elif defined(USE_SPARC_ASM)
549 static const unsigned int insn_template
[] = {
550 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */
551 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
552 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */
553 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */
554 0x8528b020, /* sllx %g2, 32, %g2 */
555 0xc2584002, /* ldx [%g1 + %g2], %g1 */
556 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */
557 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */
558 0xc6584002, /* ldx [%g1 + %g2], %g3 */
559 0x81c0c000, /* jmpl %g3, %g0 */
563 static const unsigned int insn_template
[] = {
564 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
565 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
566 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */
567 0x81c0c000, /* jmpl %g3, %g0 */
570 #endif /* __arch64__ */
571 unsigned int *code
= (unsigned int *) malloc(sizeof(insn_template
));
572 unsigned long glapi_addr
= (unsigned long) &_glapi_Dispatch
;
574 memcpy(code
, insn_template
, sizeof(insn_template
));
577 code
[0] |= (glapi_addr
>> (32 + 10));
578 code
[1] |= ((glapi_addr
& 0xffffffff) >> 10);
579 __glapi_sparc_icache_flush(&code
[0]);
580 code
[2] |= ((glapi_addr
>> 32) & ((1 << 10) - 1));
581 code
[3] |= (glapi_addr
& ((1 << 10) - 1));
582 __glapi_sparc_icache_flush(&code
[2]);
583 code
[6] |= ((functionOffset
* 8) >> 10);
584 code
[7] |= ((functionOffset
* 8) & ((1 << 10) - 1));
585 __glapi_sparc_icache_flush(&code
[6]);
587 code
[0] |= (glapi_addr
>> 10);
588 code
[1] |= (glapi_addr
& ((1 << 10) - 1));
589 __glapi_sparc_icache_flush(&code
[0]);
590 code
[2] |= (functionOffset
* 4);
591 __glapi_sparc_icache_flush(&code
[2]);
592 #endif /* __arch64__ */
594 return (_glapi_proc
) code
;
596 (void) functionOffset
;
598 #endif /* USE_*_ASM */
603 * This function inserts a new dispatch offset into the assembly language
604 * stub that was generated with the preceeding function.
607 fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
)
609 #if defined(USE_X86_ASM)
610 GLubyte
* const code
= (GLubyte
*) entrypoint
;
612 #if X86_DISPATCH_FUNCTION_SIZE == 32
613 *((unsigned int *)(code
+ 11)) = 4 * offset
;
614 *((unsigned int *)(code
+ 22)) = 4 * offset
;
615 #elif X86_DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS )
616 *((unsigned int *)(code
+ 8)) = 4 * offset
;
617 #elif X86_DISPATCH_FUNCTION_SIZE == 16
618 *((unsigned int *)(code
+ 7)) = 4 * offset
;
620 # error Invalid X86_DISPATCH_FUNCTION_SIZE!
623 #elif defined(USE_SPARC_ASM)
625 /* XXX this hasn't been tested! */
626 unsigned int *code
= (unsigned int *) entrypoint
;
628 code
[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */
629 code
[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */
630 code
[6] |= ((offset
* 8) >> 10);
631 code
[7] |= ((offset
* 8) & ((1 << 10) - 1));
632 __glapi_sparc_icache_flush(&code
[6]);
633 #else /* __arch64__ */
634 code
[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */
635 code
[2] |= (offset
* 4);
636 __glapi_sparc_icache_flush(&code
[2]);
637 #endif /* __arch64__ */
641 /* an unimplemented architecture */
645 #endif /* USE_*_ASM */
650 * Generate new entrypoint
652 * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
653 * calls \c _glapi_add_dispatch we'll put in the proper offset. If that
654 * never happens, and the user calls this function, he'll segfault. That's
655 * what you get when you try calling a GL function that doesn't really exist.
657 * \param funcName Name of the function to create an entry-point for.
659 * \sa _glapi_add_entrypoint
662 static struct _glapi_function
*
663 add_function_name( const char * funcName
)
665 struct _glapi_function
* entry
= NULL
;
667 if (NumExtEntryPoints
< MAX_EXTENSION_FUNCS
) {
668 _glapi_proc entrypoint
= generate_entrypoint(~0);
669 if (entrypoint
!= NULL
) {
670 entry
= & ExtEntryTable
[NumExtEntryPoints
];
672 ExtEntryTable
[NumExtEntryPoints
].name
= str_dup(funcName
);
673 ExtEntryTable
[NumExtEntryPoints
].parameter_signature
= NULL
;
674 ExtEntryTable
[NumExtEntryPoints
].dispatch_offset
= ~0;
675 ExtEntryTable
[NumExtEntryPoints
].dispatch_stub
= entrypoint
;
685 * Fill-in the dispatch stub for the named function.
687 * This function is intended to be called by a hardware driver. When called,
688 * a dispatch stub may be created created for the function. A pointer to this
689 * dispatch function will be returned by glXGetProcAddress.
691 * \param function_names Array of pointers to function names that should
692 * share a common dispatch offset.
693 * \param parameter_signature String representing the types of the parameters
694 * passed to the named function. Parameter types
695 * are converted to characters using the following
697 * - 'i' for \c GLint, \c GLuint, and \c GLenum
698 * - 'p' for any pointer type
699 * - 'f' for \c GLfloat and \c GLclampf
700 * - 'd' for \c GLdouble and \c GLclampd
703 * The offset in the dispatch table of the named function. A pointer to the
704 * driver's implementation of the named function should be stored at
705 * \c dispatch_table[\c offset].
707 * \sa glXGetProcAddress
710 * This function can only handle up to 8 names at a time. As far as I know,
711 * the maximum number of names ever associated with an existing GL function is
712 * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
713 * \c glPointParameterfARB, and \c glPointParameterf), so this should not be
714 * too painful of a limitation.
717 * Determine whether or not \c parameter_signature should be allowed to be
718 * \c NULL. It doesn't seem like much of a hardship for drivers to have to
719 * pass in an empty string.
722 * Determine if code should be added to reject function names that start with
726 * Add code to compare \c parameter_signature with the parameter signature of
727 * a static function. In order to do that, we need to find a way to \b get
728 * the parameter signature of a static function.
732 _glapi_add_dispatch( const char * const * function_names
,
733 const char * parameter_signature
)
735 static int next_dynamic_offset
= _gloffset_FIRST_DYNAMIC
;
736 const char * const real_sig
= (parameter_signature
!= NULL
)
737 ? parameter_signature
: "";
738 struct _glapi_function
* entry
[8];
739 GLboolean is_static
[8];
746 (void) memset( is_static
, 0, sizeof( is_static
) );
747 (void) memset( entry
, 0, sizeof( entry
) );
749 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
750 /* Do some trivial validation on the name of the function.
753 if (!function_names
[i
] || function_names
[i
][0] != 'g' || function_names
[i
][1] != 'l')
756 /* Determine if the named function already exists. If the function does
757 * exist, it must have the same parameter signature as the function
761 new_offset
= get_static_proc_offset(function_names
[i
]);
762 if (new_offset
>= 0) {
763 /* FIXME: Make sure the parameter signatures match! How do we get
764 * FIXME: the parameter signature for static functions?
767 if ( (offset
!= ~0) && (new_offset
!= offset
) ) {
771 is_static
[i
] = GL_TRUE
;
776 for ( j
= 0 ; j
< NumExtEntryPoints
; j
++ ) {
777 if (strcmp(ExtEntryTable
[j
].name
, function_names
[i
]) == 0) {
778 /* The offset may be ~0 if the function name was added by
779 * glXGetProcAddress but never filled in by the driver.
782 if (ExtEntryTable
[j
].dispatch_offset
!= ~0) {
783 if (strcmp(real_sig
, ExtEntryTable
[j
].parameter_signature
)
788 if ( (offset
!= ~0) && (ExtEntryTable
[j
].dispatch_offset
!= offset
) ) {
792 offset
= ExtEntryTable
[j
].dispatch_offset
;
795 entry
[i
] = & ExtEntryTable
[j
];
802 offset
= next_dynamic_offset
;
803 next_dynamic_offset
++;
806 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
807 if (! is_static
[i
] ) {
808 if (entry
[i
] == NULL
) {
809 entry
[i
] = add_function_name( function_names
[i
] );
810 if (entry
[i
] == NULL
) {
811 /* FIXME: Possible memory leak here.
817 entry
[i
]->parameter_signature
= str_dup(real_sig
);
818 fill_in_entrypoint_offset(entry
[i
]->dispatch_stub
, offset
);
819 entry
[i
]->dispatch_offset
= offset
;
828 * Return offset of entrypoint for named function within dispatch table.
831 _glapi_get_proc_offset(const char *funcName
)
833 /* search extension functions first */
835 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
836 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
837 return ExtEntryTable
[i
].dispatch_offset
;
840 /* search static functions */
841 return get_static_proc_offset(funcName
);
847 * Return pointer to the named function. If the function name isn't found
848 * in the name of static functions, try generating a new API entrypoint on
849 * the fly with assembly language.
852 _glapi_get_proc_address(const char *funcName
)
854 struct _glapi_function
* entry
;
858 if (funcName
[0] != 'm' || funcName
[1] != 'g' || funcName
[2] != 'l')
861 if (funcName
[0] != 'g' || funcName
[1] != 'l')
865 /* search extension functions first */
866 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
867 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
868 return ExtEntryTable
[i
].dispatch_stub
;
872 #if !defined( XFree86Server ) && !defined( XGLServer )
873 /* search static functions */
875 const _glapi_proc func
= get_static_proc_address(funcName
);
879 #endif /* !defined( XFree86Server ) */
881 entry
= add_function_name(funcName
);
882 return (entry
== NULL
) ? NULL
: entry
->dispatch_stub
;
888 * Return the name of the function at the given dispatch offset.
889 * This is only intended for debugging.
892 _glapi_get_proc_name(GLuint offset
)
897 /* search built-in functions */
898 n
= get_static_proc_name(offset
);
903 /* search added extension functions */
904 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
905 if (ExtEntryTable
[i
].dispatch_offset
== offset
) {
906 return ExtEntryTable
[i
].name
;
915 * Return size of dispatch table struct as number of functions (or
919 _glapi_get_dispatch_table_size(void)
921 return DISPATCH_TABLE_SIZE
;
927 * Make sure there are no NULL pointers in the given dispatch table.
928 * Intended for debugging purposes.
931 _glapi_check_table(const struct _glapi_table
*table
)
934 const GLuint entries
= _glapi_get_dispatch_table_size();
935 const void **tab
= (const void **) table
;
937 for (i
= 1; i
< entries
; i
++) {
941 /* Do some spot checks to be sure that the dispatch table
942 * slots are assigned correctly.
945 GLuint BeginOffset
= _glapi_get_proc_offset("glBegin");
946 char *BeginFunc
= (char*) &table
->Begin
;
947 GLuint offset
= (BeginFunc
- (char *) table
) / sizeof(void *);
948 assert(BeginOffset
== _gloffset_Begin
);
949 assert(BeginOffset
== offset
);
952 GLuint viewportOffset
= _glapi_get_proc_offset("glViewport");
953 char *viewportFunc
= (char*) &table
->Viewport
;
954 GLuint offset
= (viewportFunc
- (char *) table
) / sizeof(void *);
955 assert(viewportOffset
== _gloffset_Viewport
);
956 assert(viewportOffset
== offset
);
959 GLuint VertexPointerOffset
= _glapi_get_proc_offset("glVertexPointer");
960 char *VertexPointerFunc
= (char*) &table
->VertexPointer
;
961 GLuint offset
= (VertexPointerFunc
- (char *) table
) / sizeof(void *);
962 assert(VertexPointerOffset
== _gloffset_VertexPointer
);
963 assert(VertexPointerOffset
== offset
);
966 GLuint ResetMinMaxOffset
= _glapi_get_proc_offset("glResetMinmax");
967 char *ResetMinMaxFunc
= (char*) &table
->ResetMinmax
;
968 GLuint offset
= (ResetMinMaxFunc
- (char *) table
) / sizeof(void *);
969 assert(ResetMinMaxOffset
== _gloffset_ResetMinmax
);
970 assert(ResetMinMaxOffset
== offset
);
973 GLuint blendColorOffset
= _glapi_get_proc_offset("glBlendColor");
974 char *blendColorFunc
= (char*) &table
->BlendColor
;
975 GLuint offset
= (blendColorFunc
- (char *) table
) / sizeof(void *);
976 assert(blendColorOffset
== _gloffset_BlendColor
);
977 assert(blendColorOffset
== offset
);
980 GLuint istextureOffset
= _glapi_get_proc_offset("glIsTextureEXT");
981 char *istextureFunc
= (char*) &table
->IsTextureEXT
;
982 GLuint offset
= (istextureFunc
- (char *) table
) / sizeof(void *);
983 assert(istextureOffset
== _gloffset_IsTextureEXT
);
984 assert(istextureOffset
== offset
);
987 GLuint secondaryColor3fOffset
= _glapi_get_proc_offset("glSecondaryColor3fEXT");
988 char *secondaryColor3fFunc
= (char*) &table
->SecondaryColor3fEXT
;
989 GLuint offset
= (secondaryColor3fFunc
- (char *) table
) / sizeof(void *);
990 assert(secondaryColor3fOffset
== _gloffset_SecondaryColor3fEXT
);
991 assert(secondaryColor3fOffset
== offset
);
992 assert(_glapi_get_proc_address("glSecondaryColor3fEXT") == (_glapi_proc
) &glSecondaryColor3fEXT
);
995 GLuint pointParameterivOffset
= _glapi_get_proc_offset("glPointParameterivNV");
996 char *pointParameterivFunc
= (char*) &table
->PointParameterivNV
;
997 GLuint offset
= (pointParameterivFunc
- (char *) table
) / sizeof(void *);
998 assert(pointParameterivOffset
== _gloffset_PointParameterivNV
);
999 assert(pointParameterivOffset
== offset
);
1000 assert(_glapi_get_proc_address("glPointParameterivNV") == (_glapi_proc
) &glPointParameterivNV
);
1003 GLuint setFenceOffset
= _glapi_get_proc_offset("glSetFenceNV");
1004 char *setFenceFunc
= (char*) &table
->SetFenceNV
;
1005 GLuint offset
= (setFenceFunc
- (char *) table
) / sizeof(void *);
1006 assert(setFenceOffset
== _gloffset_SetFenceNV
);
1007 assert(setFenceOffset
== offset
);
1008 assert(_glapi_get_proc_address("glSetFenceNV") == (_glapi_proc
) &glSetFenceNV
);
1017 * Perform platform-specific GL API entry-point fixups.
1022 init_glapi_relocs( void )
1024 #if defined( USE_X86_ASM ) && defined( GLX_USE_TLS )
1025 extern void * _x86_get_dispatch(void);
1026 const GLubyte
* const get_disp
= (const GLubyte
*) _x86_get_dispatch
;
1027 GLubyte
* curr_func
= (GLubyte
*) gl_dispatch_functions_start
;
1030 while ( curr_func
!= (GLubyte
*) gl_dispatch_functions_end
) {
1031 (void) memcpy( curr_func
, get_disp
, 6 );
1032 curr_func
+= X86_DISPATCH_FUNCTION_SIZE
;
1034 #endif /* defined( USE_X86_ASM ) && defined( GLX_USE_TLS ) */