2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2003 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"
59 /***** BEGIN NO-OP DISPATCH *****/
61 static GLboolean WarnFlag
= GL_FALSE
;
62 static _glapi_warning_func warning_func
;
64 static void init_glapi_relocs(void);
66 static _glapi_proc
generate_entrypoint(GLuint functionOffset
);
67 static void fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
);
70 * Enable/disable printing of warning messages.
73 _glapi_noop_enable_warnings(GLboolean enable
)
79 * Register a callback function for reporting errors.
82 _glapi_set_warning_func( _glapi_warning_func func
)
90 if ((WarnFlag
|| getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
100 #define KEYWORD1 static
101 #define KEYWORD2 GLAPIENTRY
102 #define NAME(func) NoOp##func
106 #define DISPATCH(func, args, msg) \
108 warning_func(NULL, "GL User Error: called without context: %s", #func); \
111 #define RETURN_DISPATCH(func, args, msg) \
113 warning_func(NULL, "GL User Error: called without context: %s", #func); \
117 #define DISPATCH_TABLE_NAME __glapi_noop_table
118 #define UNUSED_TABLE_NAME __unused_noop_functions
120 #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
122 static GLint
NoOpUnused(void)
125 warning_func(NULL
, "GL User Error: calling extension function without a current context\n");
130 #include "glapitemp.h"
132 /***** END NO-OP DISPATCH *****/
137 * \name Current dispatch and current context control variables
139 * Depending on whether or not multithreading is support, and the type of
140 * support available, several variables are used to store the current context
141 * pointer and the current dispatch table pointer. In the non-threaded case,
142 * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this
145 * In the "normal" threaded case, the variables \c _glapi_Dispatch and
146 * \c _glapi_Context will be \c NULL if an application is detected as being
147 * multithreaded. Single-threaded applications will use \c _glapi_Dispatch
148 * and \c _glapi_Context just like the case without any threading support.
149 * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state
150 * data \c _gl_DispatchTSD and \c ContextTSD are used. Drivers and the
151 * static dispatch functions access these variables via \c _glapi_get_dispatch
152 * and \c _glapi_get_context.
154 * There is a race condition in setting \c _glapi_Dispatch to \c NULL. It is
155 * possible for the original thread to be setting it at the same instant a new
156 * thread, perhaps running on a different processor, is clearing it. Because
157 * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is
158 * used to determine whether or not the application is multithreaded.
160 * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are
161 * hardcoded to \c NULL. Instead the TLS variables \c _glapi_tls_Dispatch and
162 * \c _glapi_tls_Context are used. Having \c _glapi_Dispatch and
163 * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability
164 * between TLS enabled loaders and non-TLS DRI drivers.
167 #if defined(GLX_USE_TLS)
169 PUBLIC __thread
struct _glapi_table
* _glapi_tls_Dispatch
170 __attribute__((tls_model("initial-exec")))
171 = (struct _glapi_table
*) __glapi_noop_table
;
173 PUBLIC __thread
void * _glapi_tls_Context
174 __attribute__((tls_model("initial-exec")));
176 PUBLIC
const struct _glapi_table
*_glapi_Dispatch
= NULL
;
177 PUBLIC
const void *_glapi_Context
= NULL
;
183 static GLboolean ThreadSafe
= GL_FALSE
; /**< In thread-safe mode? */
184 _glthread_TSD _gl_DispatchTSD
; /**< Per-thread dispatch pointer */
185 static _glthread_TSD ContextTSD
; /**< Per-thread context pointer */
187 #endif /* defined(THREADS) */
189 PUBLIC
struct _glapi_table
*_glapi_Dispatch
=
190 (struct _glapi_table
*) __glapi_noop_table
;
191 PUBLIC
void *_glapi_Context
= NULL
;
193 #endif /* defined(GLX_USE_TLS) */
198 * strdup() is actually not a standard ANSI C or POSIX routine.
199 * Irix will not define it if ANSI mode is in effect.
202 str_dup(const char *str
)
205 copy
= (char*) malloc(strlen(str
) + 1);
215 * We should call this periodically from a function such as glXMakeCurrent
216 * in order to test if multiple threads are being used.
219 _glapi_check_multithread(void)
221 #if defined(THREADS) && !defined(GLX_USE_TLS)
223 static unsigned long knownID
;
224 static GLboolean firstCall
= GL_TRUE
;
226 knownID
= _glthread_GetID();
227 firstCall
= GL_FALSE
;
229 else if (knownID
!= _glthread_GetID()) {
230 ThreadSafe
= GL_TRUE
;
231 _glapi_set_dispatch(NULL
);
234 else if (!_glapi_get_dispatch()) {
235 /* make sure that this thread's dispatch pointer isn't null */
236 _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
)
251 (void) __unused_noop_functions
; /* silence a warning */
252 #if defined(GLX_USE_TLS)
253 _glapi_tls_Context
= context
;
254 #elif defined(THREADS)
255 _glthread_SetTSD(&ContextTSD
, context
);
256 _glapi_Context
= (ThreadSafe
) ? NULL
: 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)
272 #if defined(GLX_USE_TLS)
273 return _glapi_tls_Context
;
274 #elif defined(THREADS)
276 return _glthread_GetTSD(&ContextTSD
);
279 return _glapi_Context
;
282 return _glapi_Context
;
289 * Set the global or per-thread dispatch table pointer.
292 _glapi_set_dispatch(struct _glapi_table
*dispatch
)
294 #if defined(PTHREADS) || defined(GLX_USE_TLS)
295 static pthread_once_t once_control
= PTHREAD_ONCE_INIT
;
298 pthread_once( & once_control
, init_glapi_relocs
);
302 /* use the no-op functions */
303 dispatch
= (struct _glapi_table
*) __glapi_noop_table
;
307 _glapi_check_table(dispatch
);
311 #if defined(GLX_USE_TLS)
312 _glapi_tls_Dispatch
= dispatch
;
313 #elif defined(THREADS)
314 _glthread_SetTSD(&_gl_DispatchTSD
, (void *) dispatch
);
315 _glapi_Dispatch
= (ThreadSafe
) ? NULL
: dispatch
;
317 _glapi_Dispatch
= dispatch
;
324 * Return pointer to current dispatch table for calling thread.
326 PUBLIC
struct _glapi_table
*
327 _glapi_get_dispatch(void)
329 struct _glapi_table
* api
;
331 #if defined(GLX_USE_TLS)
332 api
= _glapi_tls_Dispatch
;
333 #elif defined(THREADS)
335 ? (struct _glapi_table
*) _glthread_GetTSD(&_gl_DispatchTSD
)
338 api
= _glapi_Dispatch
;
341 assert( api
!= NULL
);
346 #if !defined( USE_X86_ASM ) && !defined( XFree86Server )
347 #define NEED_FUNCTION_POINTER
350 /* The code in this file is auto-generated with Python */
355 * Search the table of static entrypoint functions for the named function
356 * and return the corresponding glprocs_table_t entry.
358 static const glprocs_table_t
*
359 find_entry( const char * n
)
363 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
364 const char * test_name
;
366 test_name
= gl_string_table
+ static_functions
[i
].Name_offset
;
367 if (strcmp(test_name
, n
) == 0) {
368 return & static_functions
[i
];
376 * Return dispatch table offset of the named static (built-in) function.
377 * Return -1 if function not found.
380 get_static_proc_offset(const char *funcName
)
382 const glprocs_table_t
* const f
= find_entry( funcName
);
391 #if !defined( XFree86Server )
394 #if defined( GLX_USE_TLS )
395 extern GLubyte gl_dispatch_functions_start
[];
396 extern GLubyte gl_dispatch_functions_end
[];
398 extern const GLubyte gl_dispatch_functions_start
[];
401 # if defined(THREADS) && !defined(GLX_USE_TLS)
402 # define X86_DISPATCH_FUNCTION_SIZE 32
404 # define X86_DISPATCH_FUNCTION_SIZE 16
409 * Return dispatch function address 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
));
430 * Return pointer to the named static (built-in) function.
431 * \return NULL if function not found.
433 static const _glapi_proc
434 get_static_proc_address(const char *funcName
)
436 const glprocs_table_t
* const f
= find_entry( funcName
);
437 return ( f
!= NULL
) ? f
->Address
: NULL
;
440 #endif /* USE_X86_ASM */
441 #endif /* !defined( XFree86Server ) */
445 * Return the name of the function at the given offset in the dispatch
446 * table. For debugging only.
449 get_static_proc_name( GLuint offset
)
453 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
454 if (static_functions
[i
].Offset
== offset
) {
455 return gl_string_table
+ static_functions
[i
].Name_offset
;
463 /**********************************************************************
464 * Extension function management.
468 * Number of extension functions which we can dynamically add at runtime.
470 #define MAX_EXTENSION_FUNCS 300
474 * The dispatch table size (number of entries) is the size of the
475 * _glapi_table struct plus the number of dynamic entries we can add.
476 * The extra slots can be filled in by DRI drivers that register new extension
479 #define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
483 * Track information about a function added to the GL API.
485 struct _glapi_function
{
487 * Name of the function.
493 * Text string that describes the types of the parameters passed to the
494 * named function. Parameter types are converted to characters using the
496 * - 'i' for \c GLint, \c GLuint, and \c GLenum
497 * - 'p' for any pointer type
498 * - 'f' for \c GLfloat and \c GLclampf
499 * - 'd' for \c GLdouble and \c GLclampd
501 const char * parameter_signature
;
505 * Offset in the dispatch table where the pointer to the real function is
506 * located. If the driver has not requested that the named function be
507 * added to the dispatch table, this will have the value ~0.
509 unsigned dispatch_offset
;
513 * Pointer to the dispatch stub for the named function.
516 * The semantic of this field should be changed slightly. Currently, it
517 * is always expected to be non-\c NULL. However, it would be better to
518 * only allocate the entry-point stub when the application requests the
519 * function via \c glXGetProcAddress. This would save memory for all the
520 * functions that the driver exports but that the application never wants
523 _glapi_proc dispatch_stub
;
527 static struct _glapi_function ExtEntryTable
[MAX_EXTENSION_FUNCS
];
528 static GLuint NumExtEntryPoints
= 0;
531 extern void __glapi_sparc_icache_flush(unsigned int *);
535 * Generate a dispatch function (entrypoint) which jumps through
536 * the given slot number (offset) in the current dispatch table.
537 * We need assembly language in order to accomplish this.
540 generate_entrypoint(GLuint functionOffset
)
542 #if defined(USE_X86_ASM)
543 /* 32 is chosen as something of a magic offset. For x86, the dispatch
544 * at offset 32 is the first one where the offset in the
545 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
547 const GLubyte
* const template_func
= gl_dispatch_functions_start
548 + (X86_DISPATCH_FUNCTION_SIZE
* 32);
549 GLubyte
* const code
= (GLubyte
*) malloc( X86_DISPATCH_FUNCTION_SIZE
);
552 if ( code
!= NULL
) {
553 (void) memcpy( code
, template_func
, X86_DISPATCH_FUNCTION_SIZE
);
554 fill_in_entrypoint_offset( (_glapi_proc
) code
, functionOffset
);
557 return (_glapi_proc
) code
;
558 #elif defined(USE_SPARC_ASM)
561 static const unsigned int insn_template
[] = {
562 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */
563 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
564 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */
565 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */
566 0x8528b020, /* sllx %g2, 32, %g2 */
567 0xc2584002, /* ldx [%g1 + %g2], %g1 */
568 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */
569 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */
570 0xc6584002, /* ldx [%g1 + %g2], %g3 */
571 0x81c0c000, /* jmpl %g3, %g0 */
575 static const unsigned int insn_template
[] = {
576 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
577 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
578 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */
579 0x81c0c000, /* jmpl %g3, %g0 */
583 unsigned int *code
= (unsigned int *) malloc(sizeof(insn_template
));
584 unsigned long glapi_addr
= (unsigned long) &_glapi_Dispatch
;
586 memcpy(code
, insn_template
, sizeof(insn_template
));
589 code
[0] |= (glapi_addr
>> (32 + 10));
590 code
[1] |= ((glapi_addr
& 0xffffffff) >> 10);
591 __glapi_sparc_icache_flush(&code
[0]);
592 code
[2] |= ((glapi_addr
>> 32) & ((1 << 10) - 1));
593 code
[3] |= (glapi_addr
& ((1 << 10) - 1));
594 __glapi_sparc_icache_flush(&code
[2]);
595 code
[6] |= ((functionOffset
* 8) >> 10);
596 code
[7] |= ((functionOffset
* 8) & ((1 << 10) - 1));
597 __glapi_sparc_icache_flush(&code
[6]);
599 code
[0] |= (glapi_addr
>> 10);
600 code
[1] |= (glapi_addr
& ((1 << 10) - 1));
601 __glapi_sparc_icache_flush(&code
[0]);
602 code
[2] |= (functionOffset
* 4);
603 __glapi_sparc_icache_flush(&code
[2]);
606 return (_glapi_proc
) code
;
608 (void) functionOffset
;
610 #endif /* USE_*_ASM */
615 * This function inserts a new dispatch offset into the assembly language
616 * stub that was generated with the preceeding function.
619 fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
)
621 #if defined(USE_X86_ASM)
622 GLubyte
* const code
= (GLubyte
*) entrypoint
;
625 #if X86_DISPATCH_FUNCTION_SIZE == 32
626 *((unsigned int *)(code
+ 11)) = 4 * offset
;
627 *((unsigned int *)(code
+ 22)) = 4 * offset
;
628 #elif X86_DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS )
629 *((unsigned int *)(code
+ 8)) = 4 * offset
;
630 #elif X86_DISPATCH_FUNCTION_SIZE == 16
631 *((unsigned int *)(code
+ 7)) = 4 * offset
;
633 # error Invalid X86_DISPATCH_FUNCTION_SIZE!
636 #elif defined(USE_SPARC_ASM)
638 /* XXX this hasn't been tested! */
639 unsigned int *code
= (unsigned int *) entrypoint
;
641 code
[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */
642 code
[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */
643 code
[6] |= ((offset
* 8) >> 10);
644 code
[7] |= ((offset
* 8) & ((1 << 10) - 1));
645 __glapi_sparc_icache_flush(&code
[6]);
646 #else /* __arch64__ */
647 code
[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */
648 code
[2] |= (offset
* 4);
649 __glapi_sparc_icache_flush(&code
[2]);
650 #endif /* __arch64__ */
654 /* an unimplemented architecture */
658 #endif /* USE_*_ASM */
663 * Generate new entrypoint
665 * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
666 * calls \c _glapi_add_dispatch we'll put in the proper offset. If that
667 * never happens, and the user calls this function, he'll segfault. That's
668 * what you get when you try calling a GL function that doesn't really exist.
670 * \param funcName Name of the function to create an entry-point for.
672 * \sa _glapi_add_entrypoint
675 static struct _glapi_function
*
676 add_function_name( const char * funcName
)
678 struct _glapi_function
* entry
= NULL
;
680 if (NumExtEntryPoints
< MAX_EXTENSION_FUNCS
) {
681 _glapi_proc entrypoint
= generate_entrypoint(~0);
682 if (entrypoint
!= NULL
) {
683 entry
= & ExtEntryTable
[NumExtEntryPoints
];
685 ExtEntryTable
[NumExtEntryPoints
].name
= str_dup(funcName
);
686 ExtEntryTable
[NumExtEntryPoints
].parameter_signature
= NULL
;
687 ExtEntryTable
[NumExtEntryPoints
].dispatch_offset
= ~0;
688 ExtEntryTable
[NumExtEntryPoints
].dispatch_stub
= entrypoint
;
698 * Fill-in the dispatch stub for the named function.
700 * This function is intended to be called by a hardware driver. When called,
701 * a dispatch stub may be created created for the function. A pointer to this
702 * dispatch function will be returned by glXGetProcAddress.
704 * \param function_names Array of pointers to function names that should
705 * share a common dispatch offset.
706 * \param parameter_signature String representing the types of the parameters
707 * passed to the named function. Parameter types
708 * are converted to characters using the following
710 * - 'i' for \c GLint, \c GLuint, and \c GLenum
711 * - 'p' for any pointer type
712 * - 'f' for \c GLfloat and \c GLclampf
713 * - 'd' for \c GLdouble and \c GLclampd
716 * The offset in the dispatch table of the named function. A pointer to the
717 * driver's implementation of the named function should be stored at
718 * \c dispatch_table[\c offset].
720 * \sa glXGetProcAddress
723 * This function can only handle up to 8 names at a time. As far as I know,
724 * the maximum number of names ever associated with an existing GL function is
725 * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
726 * \c glPointParameterfARB, and \c glPointParameterf), so this should not be
727 * too painful of a limitation.
730 * Determine whether or not \c parameter_signature should be allowed to be
731 * \c NULL. It doesn't seem like much of a hardship for drivers to have to
732 * pass in an empty string.
735 * Determine if code should be added to reject function names that start with
739 * Add code to compare \c parameter_signature with the parameter signature of
740 * a static function. In order to do that, we need to find a way to \b get
741 * the parameter signature of a static function.
745 _glapi_add_dispatch( const char * const * function_names
,
746 const char * parameter_signature
)
748 static int next_dynamic_offset
= _gloffset_FIRST_DYNAMIC
;
749 const char * const real_sig
= (parameter_signature
!= NULL
)
750 ? parameter_signature
: "";
751 struct _glapi_function
* entry
[8];
752 GLboolean is_static
[8];
759 (void) memset( is_static
, 0, sizeof( is_static
) );
760 (void) memset( entry
, 0, sizeof( entry
) );
762 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
763 /* Do some trivial validation on the name of the function.
767 if (!function_names
[i
] || function_names
[i
][0] != 'm' || function_names
[i
][1] != 'g' || function_names
[i
][2] != 'l')
770 if (!function_names
[i
] || function_names
[i
][0] != 'g' || function_names
[i
][1] != 'l')
775 /* Determine if the named function already exists. If the function does
776 * exist, it must have the same parameter signature as the function
780 new_offset
= get_static_proc_offset(function_names
[i
]);
781 if (new_offset
>= 0) {
782 /* FIXME: Make sure the parameter signatures match! How do we get
783 * FIXME: the parameter signature for static functions?
786 if ( (offset
!= ~0) && (new_offset
!= offset
) ) {
790 is_static
[i
] = GL_TRUE
;
795 for ( j
= 0 ; j
< NumExtEntryPoints
; j
++ ) {
796 if (strcmp(ExtEntryTable
[j
].name
, function_names
[i
]) == 0) {
797 /* The offset may be ~0 if the function name was added by
798 * glXGetProcAddress but never filled in by the driver.
801 if (ExtEntryTable
[j
].dispatch_offset
!= ~0) {
802 if (strcmp(real_sig
, ExtEntryTable
[j
].parameter_signature
)
807 if ( (offset
!= ~0) && (ExtEntryTable
[j
].dispatch_offset
!= offset
) ) {
811 offset
= ExtEntryTable
[j
].dispatch_offset
;
814 entry
[i
] = & ExtEntryTable
[j
];
822 offset
= next_dynamic_offset
;
823 next_dynamic_offset
++;
827 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
828 if (! is_static
[i
] ) {
829 if (entry
[i
] == NULL
) {
830 entry
[i
] = add_function_name( function_names
[i
] );
831 if (entry
[i
] == NULL
) {
832 /* FIXME: Possible memory leak here.
839 entry
[i
]->parameter_signature
= str_dup(real_sig
);
840 fill_in_entrypoint_offset(entry
[i
]->dispatch_stub
, offset
);
841 entry
[i
]->dispatch_offset
= offset
;
850 * Return offset of entrypoint for named function within dispatch table.
853 _glapi_get_proc_offset(const char *funcName
)
855 /* search extension functions first */
857 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
858 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
859 return ExtEntryTable
[i
].dispatch_offset
;
863 /* search static functions */
864 return get_static_proc_offset(funcName
);
870 * Return pointer to the named function. If the function name isn't found
871 * in the name of static functions, try generating a new API entrypoint on
872 * the fly with assembly language.
875 _glapi_get_proc_address(const char *funcName
)
877 struct _glapi_function
* entry
;
881 if (funcName
[0] != 'm' || funcName
[1] != 'g' || funcName
[2] != 'l')
884 if (funcName
[0] != 'g' || funcName
[1] != 'l')
888 /* search extension functions first */
889 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
890 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
891 return ExtEntryTable
[i
].dispatch_stub
;
895 #if !defined( XFree86Server )
896 /* search static functions */
898 const _glapi_proc func
= get_static_proc_address(funcName
);
902 #endif /* !defined( XFree86Server ) */
904 entry
= add_function_name(funcName
);
905 return (entry
== NULL
) ? NULL
: entry
->dispatch_stub
;
911 * Return the name of the function at the given dispatch offset.
912 * This is only intended for debugging.
915 _glapi_get_proc_name(GLuint offset
)
920 /* search built-in functions */
921 n
= get_static_proc_name(offset
);
926 /* search added extension functions */
927 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
928 if (ExtEntryTable
[i
].dispatch_offset
== offset
) {
929 return ExtEntryTable
[i
].name
;
938 * Return size of dispatch table struct as number of functions (or
942 _glapi_get_dispatch_table_size(void)
944 return DISPATCH_TABLE_SIZE
;
950 * Make sure there are no NULL pointers in the given dispatch table.
951 * Intended for debugging purposes.
954 _glapi_check_table(const struct _glapi_table
*table
)
957 const GLuint entries
= _glapi_get_dispatch_table_size();
958 const void **tab
= (const void **) table
;
960 for (i
= 1; i
< entries
; i
++) {
964 /* Do some spot checks to be sure that the dispatch table
965 * slots are assigned correctly.
968 GLuint BeginOffset
= _glapi_get_proc_offset("glBegin");
969 char *BeginFunc
= (char*) &table
->Begin
;
970 GLuint offset
= (BeginFunc
- (char *) table
) / sizeof(void *);
971 assert(BeginOffset
== _gloffset_Begin
);
972 assert(BeginOffset
== offset
);
975 GLuint viewportOffset
= _glapi_get_proc_offset("glViewport");
976 char *viewportFunc
= (char*) &table
->Viewport
;
977 GLuint offset
= (viewportFunc
- (char *) table
) / sizeof(void *);
978 assert(viewportOffset
== _gloffset_Viewport
);
979 assert(viewportOffset
== offset
);
982 GLuint VertexPointerOffset
= _glapi_get_proc_offset("glVertexPointer");
983 char *VertexPointerFunc
= (char*) &table
->VertexPointer
;
984 GLuint offset
= (VertexPointerFunc
- (char *) table
) / sizeof(void *);
985 assert(VertexPointerOffset
== _gloffset_VertexPointer
);
986 assert(VertexPointerOffset
== offset
);
989 GLuint ResetMinMaxOffset
= _glapi_get_proc_offset("glResetMinmax");
990 char *ResetMinMaxFunc
= (char*) &table
->ResetMinmax
;
991 GLuint offset
= (ResetMinMaxFunc
- (char *) table
) / sizeof(void *);
992 assert(ResetMinMaxOffset
== _gloffset_ResetMinmax
);
993 assert(ResetMinMaxOffset
== offset
);
996 GLuint blendColorOffset
= _glapi_get_proc_offset("glBlendColor");
997 char *blendColorFunc
= (char*) &table
->BlendColor
;
998 GLuint offset
= (blendColorFunc
- (char *) table
) / sizeof(void *);
999 assert(blendColorOffset
== _gloffset_BlendColor
);
1000 assert(blendColorOffset
== offset
);
1003 GLuint istextureOffset
= _glapi_get_proc_offset("glIsTextureEXT");
1004 char *istextureFunc
= (char*) &table
->IsTextureEXT
;
1005 GLuint offset
= (istextureFunc
- (char *) table
) / sizeof(void *);
1006 assert(istextureOffset
== _gloffset_IsTextureEXT
);
1007 assert(istextureOffset
== offset
);
1010 GLuint secondaryColor3fOffset
= _glapi_get_proc_offset("glSecondaryColor3fEXT");
1011 char *secondaryColor3fFunc
= (char*) &table
->SecondaryColor3fEXT
;
1012 GLuint offset
= (secondaryColor3fFunc
- (char *) table
) / sizeof(void *);
1013 assert(secondaryColor3fOffset
== _gloffset_SecondaryColor3fEXT
);
1014 assert(secondaryColor3fOffset
== offset
);
1015 assert(_glapi_get_proc_address("glSecondaryColor3fEXT") == (_glapi_proc
) &glSecondaryColor3fEXT
);
1018 GLuint pointParameterivOffset
= _glapi_get_proc_offset("glPointParameterivNV");
1019 char *pointParameterivFunc
= (char*) &table
->PointParameterivNV
;
1020 GLuint offset
= (pointParameterivFunc
- (char *) table
) / sizeof(void *);
1021 assert(pointParameterivOffset
== _gloffset_PointParameterivNV
);
1022 assert(pointParameterivOffset
== offset
);
1023 assert(_glapi_get_proc_address("glPointParameterivNV") == (_glapi_proc
) &glPointParameterivNV
);
1026 GLuint setFenceOffset
= _glapi_get_proc_offset("glSetFenceNV");
1027 char *setFenceFunc
= (char*) &table
->SetFenceNV
;
1028 GLuint offset
= (setFenceFunc
- (char *) table
) / sizeof(void *);
1029 assert(setFenceOffset
== _gloffset_SetFenceNV
);
1030 assert(setFenceOffset
== offset
);
1031 assert(_glapi_get_proc_address("glSetFenceNV") == (_glapi_proc
) &glSetFenceNV
);
1040 * Perform platform-specific GL API entry-point fixups.
1045 init_glapi_relocs( void )
1047 #if defined( USE_X86_ASM ) && defined( GLX_USE_TLS )
1048 extern void * _x86_get_dispatch(void);
1049 const GLubyte
* const get_disp
= (const GLubyte
*) _x86_get_dispatch
;
1050 GLubyte
* curr_func
= (GLubyte
*) gl_dispatch_functions_start
;
1053 while ( curr_func
!= (GLubyte
*) gl_dispatch_functions_end
) {
1054 (void) memcpy( curr_func
, get_disp
, 6 );
1055 curr_func
+= X86_DISPATCH_FUNCTION_SIZE
;
1057 #endif /* defined( USE_X86_ASM ) && defined( GLX_USE_TLS ) */