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.
53 #ifdef HAVE_DIX_CONFIG_H
55 #include <dix-config.h>
71 #include "glapioffsets.h"
72 #include "glapitable.h"
74 /***** BEGIN NO-OP DISPATCH *****/
76 static GLboolean WarnFlag
= GL_FALSE
;
77 static _glapi_warning_func warning_func
;
79 #if defined(PTHREADS) || defined(GLX_USE_TLS)
80 static void init_glapi_relocs(void);
83 static _glapi_proc
generate_entrypoint(GLuint functionOffset
);
84 static void fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
);
87 * Enable/disable printing of warning messages.
90 _glapi_noop_enable_warnings(GLboolean enable
)
96 * Register a callback function for reporting errors.
99 _glapi_set_warning_func( _glapi_warning_func func
)
107 if ((WarnFlag
|| getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
117 #define KEYWORD1 static
118 #define KEYWORD1_ALT static
119 #define KEYWORD2 GLAPIENTRY
120 #define NAME(func) NoOp##func
124 #define DISPATCH(func, args, msg) \
126 warning_func(NULL, "GL User Error: called without context: %s", #func); \
129 #define RETURN_DISPATCH(func, args, msg) \
131 warning_func(NULL, "GL User Error: called without context: %s", #func); \
135 #define DISPATCH_TABLE_NAME __glapi_noop_table
136 #define UNUSED_TABLE_NAME __unused_noop_functions
138 #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
140 static GLint
NoOpUnused(void)
143 warning_func(NULL
, "GL User Error: calling extension function without a current context\n");
148 #include "glapitemp.h"
150 /***** END NO-OP DISPATCH *****/
155 * \name Current dispatch and current context control variables
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
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.
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.
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.
185 #if defined(GLX_USE_TLS)
187 PUBLIC __thread
struct _glapi_table
* _glapi_tls_Dispatch
188 __attribute__((tls_model("initial-exec")))
189 = (struct _glapi_table
*) __glapi_noop_table
;
191 PUBLIC __thread
void * _glapi_tls_Context
192 __attribute__((tls_model("initial-exec")));
194 PUBLIC
const struct _glapi_table
*_glapi_Dispatch
= NULL
;
195 PUBLIC
const void *_glapi_Context
= NULL
;
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 */
205 #if defined(WIN32_THREADS)
206 void FreeTSD(_glthread_TSD
*p
);
207 void FreeAllTSD(void)
209 FreeTSD(&_gl_DispatchTSD
);
210 FreeTSD(&ContextTSD
);
212 #endif /* defined(WIN32_THREADS) */
214 #endif /* defined(THREADS) */
216 PUBLIC
struct _glapi_table
*_glapi_Dispatch
=
217 (struct _glapi_table
*) __glapi_noop_table
;
218 PUBLIC
void *_glapi_Context
= NULL
;
220 #endif /* defined(GLX_USE_TLS) */
225 * strdup() is actually not a standard ANSI C or POSIX routine.
226 * Irix will not define it if ANSI mode is in effect.
229 str_dup(const char *str
)
232 copy
= (char*) malloc(strlen(str
) + 1);
242 * We should call this periodically from a function such as glXMakeCurrent
243 * in order to test if multiple threads are being used.
246 _glapi_check_multithread(void)
248 #if defined(THREADS) && !defined(GLX_USE_TLS)
250 static unsigned long knownID
;
251 static GLboolean firstCall
= GL_TRUE
;
253 knownID
= _glthread_GetID();
254 firstCall
= GL_FALSE
;
256 else if (knownID
!= _glthread_GetID()) {
257 ThreadSafe
= GL_TRUE
;
258 _glapi_set_dispatch(NULL
);
259 _glapi_set_context(NULL
);
262 else if (!_glapi_get_dispatch()) {
263 /* make sure that this thread's dispatch pointer isn't null */
264 _glapi_set_dispatch(NULL
);
272 * Set the current context pointer for this thread.
273 * The context pointer is an opaque type which should be cast to
274 * void from the real context pointer type.
277 _glapi_set_context(void *context
)
279 (void) __unused_noop_functions
; /* silence a warning */
280 #if defined(GLX_USE_TLS)
281 _glapi_tls_Context
= context
;
282 #elif defined(THREADS)
283 _glthread_SetTSD(&ContextTSD
, context
);
284 _glapi_Context
= (ThreadSafe
) ? NULL
: context
;
286 _glapi_Context
= context
;
293 * Get the current context pointer for this thread.
294 * The context pointer is an opaque type which should be cast from
295 * void to the real context pointer type.
298 _glapi_get_context(void)
300 #if defined(GLX_USE_TLS)
301 return _glapi_tls_Context
;
302 #elif defined(THREADS)
304 return _glthread_GetTSD(&ContextTSD
);
307 return _glapi_Context
;
310 return _glapi_Context
;
317 * Set the global or per-thread dispatch table pointer.
318 * If the dispatch parameter is NULL we'll plug in the no-op dispatch
319 * table (__glapi_noop_table).
322 _glapi_set_dispatch(struct _glapi_table
*dispatch
)
324 #if defined(PTHREADS) || defined(GLX_USE_TLS)
325 static pthread_once_t once_control
= PTHREAD_ONCE_INIT
;
326 pthread_once( & once_control
, init_glapi_relocs
);
330 /* use the no-op functions */
331 dispatch
= (struct _glapi_table
*) __glapi_noop_table
;
335 _glapi_check_table(dispatch
);
339 #if defined(GLX_USE_TLS)
340 _glapi_tls_Dispatch
= dispatch
;
341 #elif defined(THREADS)
342 _glthread_SetTSD(&_gl_DispatchTSD
, (void *) dispatch
);
343 _glapi_Dispatch
= (ThreadSafe
) ? NULL
: dispatch
;
345 _glapi_Dispatch
= dispatch
;
352 * Return pointer to current dispatch table for calling thread.
354 PUBLIC
struct _glapi_table
*
355 _glapi_get_dispatch(void)
357 struct _glapi_table
* api
;
358 #if defined(GLX_USE_TLS)
359 api
= _glapi_tls_Dispatch
;
360 #elif defined(THREADS)
362 ? (struct _glapi_table
*) _glthread_GetTSD(&_gl_DispatchTSD
)
365 api
= _glapi_Dispatch
;
373 *** The rest of this file is pretty much concerned with GetProcAddress
377 #if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)
378 # define DISPATCH_FUNCTION_SIZE 16
379 #elif defined(USE_X86_ASM)
380 # if defined(THREADS) && !defined(GLX_USE_TLS)
381 # define DISPATCH_FUNCTION_SIZE 32
383 # define DISPATCH_FUNCTION_SIZE 16
387 #if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer)
388 # define NEED_FUNCTION_POINTER
391 /* The code in this file is auto-generated with Python */
396 * Search the table of static entrypoint functions for the named function
397 * and return the corresponding glprocs_table_t entry.
399 static const glprocs_table_t
*
400 find_entry( const char * n
)
403 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
404 const char *testName
= gl_string_table
+ static_functions
[i
].Name_offset
;
405 if (strcmp(testName
, n
) == 0) {
406 return &static_functions
[i
];
414 * Return dispatch table offset of the named static (built-in) function.
415 * Return -1 if function not found.
418 get_static_proc_offset(const char *funcName
)
420 const glprocs_table_t
* const f
= find_entry( funcName
);
428 #if !defined(XFree86Server) && !defined(XGLServer)
431 #if defined( GLX_USE_TLS )
432 extern GLubyte gl_dispatch_functions_start
[];
433 extern GLubyte gl_dispatch_functions_end
[];
435 extern const GLubyte gl_dispatch_functions_start
[];
438 #endif /* USE_X86_ASM */
442 * Return dispatch function address for the named static (built-in) function.
443 * Return NULL if function not found.
446 get_static_proc_address(const char *funcName
)
448 const glprocs_table_t
* const f
= find_entry( funcName
);
450 #if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING)
451 return (f
->Address
== NULL
)
452 ? (_glapi_proc
) (gl_dispatch_functions_start
453 + (DISPATCH_FUNCTION_SIZE
* f
->Offset
))
455 #elif defined(DISPATCH_FUNCTION_SIZE)
456 return (_glapi_proc
) (gl_dispatch_functions_start
457 + (DISPATCH_FUNCTION_SIZE
* f
->Offset
));
467 #endif /* !defined(XFree86Server) && !defined(XGLServer) */
472 * Return the name of the function at the given offset in the dispatch
473 * table. For debugging only.
476 get_static_proc_name( GLuint offset
)
479 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
480 if (static_functions
[i
].Offset
== offset
) {
481 return gl_string_table
+ static_functions
[i
].Name_offset
;
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 dispatch table size (number of entries) is the size of 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)
509 * Track information about a function added to the GL API.
511 struct _glapi_function
{
513 * Name of the function.
519 * Text string that describes the types of the parameters passed to the
520 * named function. Parameter types are converted to characters using the
522 * - 'i' for \c GLint, \c GLuint, and \c GLenum
523 * - 'p' for any pointer type
524 * - 'f' for \c GLfloat and \c GLclampf
525 * - 'd' for \c GLdouble and \c GLclampd
527 const char * parameter_signature
;
531 * Offset in the dispatch table where the pointer to the real function is
532 * located. If the driver has not requested that the named function be
533 * added to the dispatch table, this will have the value ~0.
535 unsigned dispatch_offset
;
539 * Pointer to the dispatch stub for the named function.
542 * The semantic of this field should be changed slightly. Currently, it
543 * is always expected to be non-\c NULL. However, it would be better to
544 * only allocate the entry-point stub when the application requests the
545 * function via \c glXGetProcAddress. This would save memory for all the
546 * functions that the driver exports but that the application never wants
549 _glapi_proc dispatch_stub
;
553 static struct _glapi_function ExtEntryTable
[MAX_EXTENSION_FUNCS
];
554 static GLuint NumExtEntryPoints
= 0;
557 extern void __glapi_sparc_icache_flush(unsigned int *);
561 * Generate a dispatch function (entrypoint) which jumps through
562 * the given slot number (offset) in the current dispatch table.
563 * We need assembly language in order to accomplish this.
566 generate_entrypoint(GLuint functionOffset
)
568 #if defined(USE_X86_ASM)
569 /* 32 is chosen as something of a magic offset. For x86, the dispatch
570 * at offset 32 is the first one where the offset in the
571 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
573 const GLubyte
* const template_func
= gl_dispatch_functions_start
574 + (DISPATCH_FUNCTION_SIZE
* 32);
575 GLubyte
* const code
= (GLubyte
*) malloc(DISPATCH_FUNCTION_SIZE
);
578 if ( code
!= NULL
) {
579 (void) memcpy(code
, template_func
, DISPATCH_FUNCTION_SIZE
);
580 fill_in_entrypoint_offset( (_glapi_proc
) code
, functionOffset
);
583 return (_glapi_proc
) code
;
584 #elif defined(USE_SPARC_ASM)
587 static const unsigned int insn_template
[] = {
588 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */
589 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
590 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */
591 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */
592 0x8528b020, /* sllx %g2, 32, %g2 */
593 0xc2584002, /* ldx [%g1 + %g2], %g1 */
594 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */
595 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */
596 0xc6584002, /* ldx [%g1 + %g2], %g3 */
597 0x81c0c000, /* jmpl %g3, %g0 */
601 static const unsigned int insn_template
[] = {
602 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
603 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
604 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */
605 0x81c0c000, /* jmpl %g3, %g0 */
608 #endif /* __arch64__ */
609 unsigned int *code
= (unsigned int *) malloc(sizeof(insn_template
));
610 unsigned long glapi_addr
= (unsigned long) &_glapi_Dispatch
;
612 memcpy(code
, insn_template
, sizeof(insn_template
));
615 code
[0] |= (glapi_addr
>> (32 + 10));
616 code
[1] |= ((glapi_addr
& 0xffffffff) >> 10);
617 __glapi_sparc_icache_flush(&code
[0]);
618 code
[2] |= ((glapi_addr
>> 32) & ((1 << 10) - 1));
619 code
[3] |= (glapi_addr
& ((1 << 10) - 1));
620 __glapi_sparc_icache_flush(&code
[2]);
621 code
[6] |= ((functionOffset
* 8) >> 10);
622 code
[7] |= ((functionOffset
* 8) & ((1 << 10) - 1));
623 __glapi_sparc_icache_flush(&code
[6]);
625 code
[0] |= (glapi_addr
>> 10);
626 code
[1] |= (glapi_addr
& ((1 << 10) - 1));
627 __glapi_sparc_icache_flush(&code
[0]);
628 code
[2] |= (functionOffset
* 4);
629 __glapi_sparc_icache_flush(&code
[2]);
630 #endif /* __arch64__ */
632 return (_glapi_proc
) code
;
634 (void) functionOffset
;
636 #endif /* USE_*_ASM */
641 * This function inserts a new dispatch offset into the assembly language
642 * stub that was generated with the preceeding function.
645 fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
)
647 #if defined(USE_X86_ASM)
648 GLubyte
* const code
= (GLubyte
*) entrypoint
;
650 #if DISPATCH_FUNCTION_SIZE == 32
651 *((unsigned int *)(code
+ 11)) = 4 * offset
;
652 *((unsigned int *)(code
+ 22)) = 4 * offset
;
653 #elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS )
654 *((unsigned int *)(code
+ 8)) = 4 * offset
;
655 #elif DISPATCH_FUNCTION_SIZE == 16
656 *((unsigned int *)(code
+ 7)) = 4 * offset
;
658 # error Invalid DISPATCH_FUNCTION_SIZE!
661 #elif defined(USE_SPARC_ASM)
663 /* XXX this hasn't been tested! */
664 unsigned int *code
= (unsigned int *) entrypoint
;
666 code
[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */
667 code
[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */
668 code
[6] |= ((offset
* 8) >> 10);
669 code
[7] |= ((offset
* 8) & ((1 << 10) - 1));
670 __glapi_sparc_icache_flush(&code
[6]);
671 #else /* __arch64__ */
672 code
[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */
673 code
[2] |= (offset
* 4);
674 __glapi_sparc_icache_flush(&code
[2]);
675 #endif /* __arch64__ */
679 /* an unimplemented architecture */
683 #endif /* USE_*_ASM */
688 * Generate new entrypoint
690 * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
691 * calls \c _glapi_add_dispatch we'll put in the proper offset. If that
692 * never happens, and the user calls this function, he'll segfault. That's
693 * what you get when you try calling a GL function that doesn't really exist.
695 * \param funcName Name of the function to create an entry-point for.
697 * \sa _glapi_add_entrypoint
700 static struct _glapi_function
*
701 add_function_name( const char * funcName
)
703 struct _glapi_function
* entry
= NULL
;
705 if (NumExtEntryPoints
< MAX_EXTENSION_FUNCS
) {
706 _glapi_proc entrypoint
= generate_entrypoint(~0);
707 if (entrypoint
!= NULL
) {
708 entry
= & ExtEntryTable
[NumExtEntryPoints
];
710 ExtEntryTable
[NumExtEntryPoints
].name
= str_dup(funcName
);
711 ExtEntryTable
[NumExtEntryPoints
].parameter_signature
= NULL
;
712 ExtEntryTable
[NumExtEntryPoints
].dispatch_offset
= ~0;
713 ExtEntryTable
[NumExtEntryPoints
].dispatch_stub
= entrypoint
;
723 * Fill-in the dispatch stub for the named function.
725 * This function is intended to be called by a hardware driver. When called,
726 * a dispatch stub may be created created for the function. A pointer to this
727 * dispatch function will be returned by glXGetProcAddress.
729 * \param function_names Array of pointers to function names that should
730 * share a common dispatch offset.
731 * \param parameter_signature String representing the types of the parameters
732 * passed to the named function. Parameter types
733 * are converted to characters using the following
735 * - 'i' for \c GLint, \c GLuint, and \c GLenum
736 * - 'p' for any pointer type
737 * - 'f' for \c GLfloat and \c GLclampf
738 * - 'd' for \c GLdouble and \c GLclampd
741 * The offset in the dispatch table of the named function. A pointer to the
742 * driver's implementation of the named function should be stored at
743 * \c dispatch_table[\c offset].
745 * \sa glXGetProcAddress
748 * This function can only handle up to 8 names at a time. As far as I know,
749 * the maximum number of names ever associated with an existing GL function is
750 * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
751 * \c glPointParameterfARB, and \c glPointParameterf), so this should not be
752 * too painful of a limitation.
755 * Determine whether or not \c parameter_signature should be allowed to be
756 * \c NULL. It doesn't seem like much of a hardship for drivers to have to
757 * pass in an empty string.
760 * Determine if code should be added to reject function names that start with
764 * Add code to compare \c parameter_signature with the parameter signature of
765 * a static function. In order to do that, we need to find a way to \b get
766 * the parameter signature of a static function.
770 _glapi_add_dispatch( const char * const * function_names
,
771 const char * parameter_signature
)
773 static int next_dynamic_offset
= _gloffset_FIRST_DYNAMIC
;
774 const char * const real_sig
= (parameter_signature
!= NULL
)
775 ? parameter_signature
: "";
776 struct _glapi_function
* entry
[8];
777 GLboolean is_static
[8];
784 (void) memset( is_static
, 0, sizeof( is_static
) );
785 (void) memset( entry
, 0, sizeof( entry
) );
787 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
788 /* Do some trivial validation on the name of the function.
791 if (!function_names
[i
] || function_names
[i
][0] != 'g' || function_names
[i
][1] != 'l')
794 /* Determine if the named function already exists. If the function does
795 * exist, it must have the same parameter signature as the function
799 new_offset
= get_static_proc_offset(function_names
[i
]);
800 if (new_offset
>= 0) {
801 /* FIXME: Make sure the parameter signatures match! How do we get
802 * FIXME: the parameter signature for static functions?
805 if ( (offset
!= ~0) && (new_offset
!= offset
) ) {
809 is_static
[i
] = GL_TRUE
;
814 for ( j
= 0 ; j
< NumExtEntryPoints
; j
++ ) {
815 if (strcmp(ExtEntryTable
[j
].name
, function_names
[i
]) == 0) {
816 /* The offset may be ~0 if the function name was added by
817 * glXGetProcAddress but never filled in by the driver.
820 if (ExtEntryTable
[j
].dispatch_offset
!= ~0) {
821 if (strcmp(real_sig
, ExtEntryTable
[j
].parameter_signature
)
826 if ( (offset
!= ~0) && (ExtEntryTable
[j
].dispatch_offset
!= offset
) ) {
830 offset
= ExtEntryTable
[j
].dispatch_offset
;
833 entry
[i
] = & ExtEntryTable
[j
];
840 offset
= next_dynamic_offset
;
841 next_dynamic_offset
++;
844 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
845 if (! is_static
[i
] ) {
846 if (entry
[i
] == NULL
) {
847 entry
[i
] = add_function_name( function_names
[i
] );
848 if (entry
[i
] == NULL
) {
849 /* FIXME: Possible memory leak here.
855 entry
[i
]->parameter_signature
= str_dup(real_sig
);
856 fill_in_entrypoint_offset(entry
[i
]->dispatch_stub
, offset
);
857 entry
[i
]->dispatch_offset
= offset
;
866 * Return offset of entrypoint for named function within dispatch table.
869 _glapi_get_proc_offset(const char *funcName
)
871 /* search extension functions first */
873 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
874 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
875 return ExtEntryTable
[i
].dispatch_offset
;
878 /* search static functions */
879 return get_static_proc_offset(funcName
);
885 * Return pointer to the named function. If the function name isn't found
886 * in the name of static functions, try generating a new API entrypoint on
887 * the fly with assembly language.
890 _glapi_get_proc_address(const char *funcName
)
892 struct _glapi_function
* entry
;
896 if (funcName
[0] != 'm' || funcName
[1] != 'g' || funcName
[2] != 'l')
899 if (funcName
[0] != 'g' || funcName
[1] != 'l')
903 /* search extension functions first */
904 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
905 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
906 return ExtEntryTable
[i
].dispatch_stub
;
910 #if !defined( XFree86Server ) && !defined( XGLServer )
911 /* search static functions */
913 const _glapi_proc func
= get_static_proc_address(funcName
);
917 #endif /* !defined( XFree86Server ) */
919 entry
= add_function_name(funcName
);
920 return (entry
== NULL
) ? NULL
: entry
->dispatch_stub
;
926 * Return the name of the function at the given dispatch offset.
927 * This is only intended for debugging.
930 _glapi_get_proc_name(GLuint offset
)
935 /* search built-in functions */
936 n
= get_static_proc_name(offset
);
941 /* search added extension functions */
942 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
943 if (ExtEntryTable
[i
].dispatch_offset
== offset
) {
944 return ExtEntryTable
[i
].name
;
953 * Return size of dispatch table struct as number of functions (or
957 _glapi_get_dispatch_table_size(void)
959 return DISPATCH_TABLE_SIZE
;
965 * Make sure there are no NULL pointers in the given dispatch table.
966 * Intended for debugging purposes.
969 _glapi_check_table(const struct _glapi_table
*table
)
972 const GLuint entries
= _glapi_get_dispatch_table_size();
973 const void **tab
= (const void **) table
;
975 for (i
= 1; i
< entries
; i
++) {
979 /* Do some spot checks to be sure that the dispatch table
980 * slots are assigned correctly.
983 GLuint BeginOffset
= _glapi_get_proc_offset("glBegin");
984 char *BeginFunc
= (char*) &table
->Begin
;
985 GLuint offset
= (BeginFunc
- (char *) table
) / sizeof(void *);
986 assert(BeginOffset
== _gloffset_Begin
);
987 assert(BeginOffset
== offset
);
990 GLuint viewportOffset
= _glapi_get_proc_offset("glViewport");
991 char *viewportFunc
= (char*) &table
->Viewport
;
992 GLuint offset
= (viewportFunc
- (char *) table
) / sizeof(void *);
993 assert(viewportOffset
== _gloffset_Viewport
);
994 assert(viewportOffset
== offset
);
997 GLuint VertexPointerOffset
= _glapi_get_proc_offset("glVertexPointer");
998 char *VertexPointerFunc
= (char*) &table
->VertexPointer
;
999 GLuint offset
= (VertexPointerFunc
- (char *) table
) / sizeof(void *);
1000 assert(VertexPointerOffset
== _gloffset_VertexPointer
);
1001 assert(VertexPointerOffset
== offset
);
1004 GLuint ResetMinMaxOffset
= _glapi_get_proc_offset("glResetMinmax");
1005 char *ResetMinMaxFunc
= (char*) &table
->ResetMinmax
;
1006 GLuint offset
= (ResetMinMaxFunc
- (char *) table
) / sizeof(void *);
1007 assert(ResetMinMaxOffset
== _gloffset_ResetMinmax
);
1008 assert(ResetMinMaxOffset
== offset
);
1011 GLuint blendColorOffset
= _glapi_get_proc_offset("glBlendColor");
1012 char *blendColorFunc
= (char*) &table
->BlendColor
;
1013 GLuint offset
= (blendColorFunc
- (char *) table
) / sizeof(void *);
1014 assert(blendColorOffset
== _gloffset_BlendColor
);
1015 assert(blendColorOffset
== offset
);
1018 GLuint secondaryColor3fOffset
= _glapi_get_proc_offset("glSecondaryColor3fEXT");
1019 char *secondaryColor3fFunc
= (char*) &table
->SecondaryColor3fEXT
;
1020 GLuint offset
= (secondaryColor3fFunc
- (char *) table
) / sizeof(void *);
1021 assert(secondaryColor3fOffset
== _gloffset_SecondaryColor3fEXT
);
1022 assert(secondaryColor3fOffset
== offset
);
1025 GLuint pointParameterivOffset
= _glapi_get_proc_offset("glPointParameterivNV");
1026 char *pointParameterivFunc
= (char*) &table
->PointParameterivNV
;
1027 GLuint offset
= (pointParameterivFunc
- (char *) table
) / sizeof(void *);
1028 assert(pointParameterivOffset
== _gloffset_PointParameterivNV
);
1029 assert(pointParameterivOffset
== offset
);
1032 GLuint setFenceOffset
= _glapi_get_proc_offset("glSetFenceNV");
1033 char *setFenceFunc
= (char*) &table
->SetFenceNV
;
1034 GLuint offset
= (setFenceFunc
- (char *) table
) / sizeof(void *);
1035 assert(setFenceOffset
== _gloffset_SetFenceNV
);
1036 assert(setFenceOffset
== offset
);
1044 #if defined(PTHREADS) || defined(GLX_USE_TLS)
1046 * Perform platform-specific GL API entry-point fixups.
1049 init_glapi_relocs( void )
1051 #if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
1052 extern unsigned long _x86_get_dispatch(void);
1053 char run_time_patch
[] = {
1054 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
1056 GLuint
*offset
= (GLuint
*) &run_time_patch
[2]; /* 32-bits for x86/32 */
1057 const GLubyte
* const get_disp
= (const GLubyte
*) run_time_patch
;
1058 GLubyte
* curr_func
= (GLubyte
*) gl_dispatch_functions_start
;
1060 *offset
= _x86_get_dispatch();
1061 while ( curr_func
!= (GLubyte
*) gl_dispatch_functions_end
) {
1062 (void) memcpy( curr_func
, get_disp
, sizeof(run_time_patch
));
1063 curr_func
+= DISPATCH_FUNCTION_SIZE
;
1067 #endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */