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>
68 #include "glapioffsets.h"
69 #include "glapitable.h"
71 /***** BEGIN NO-OP DISPATCH *****/
73 static GLboolean WarnFlag
= GL_FALSE
;
74 static _glapi_warning_func warning_func
;
76 #if defined(PTHREADS) || defined(GLX_USE_TLS)
77 static void init_glapi_relocs(void);
80 static _glapi_proc
generate_entrypoint(GLuint functionOffset
);
81 static void fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
);
84 * Enable/disable printing of warning messages.
87 _glapi_noop_enable_warnings(GLboolean enable
)
93 * Register a callback function for reporting errors.
96 _glapi_set_warning_func( _glapi_warning_func func
)
104 if ((WarnFlag
|| getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
114 #define KEYWORD1 static
115 #define KEYWORD1_ALT static
116 #define KEYWORD2 GLAPIENTRY
117 #define NAME(func) NoOp##func
121 #define DISPATCH(func, args, msg) \
123 warning_func(NULL, "GL User Error: called without context: %s", #func); \
126 #define RETURN_DISPATCH(func, args, msg) \
128 warning_func(NULL, "GL User Error: called without context: %s", #func); \
132 #define DISPATCH_TABLE_NAME __glapi_noop_table
133 #define UNUSED_TABLE_NAME __unused_noop_functions
135 #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
137 static GLint
NoOpUnused(void)
140 warning_func(NULL
, "GL User Error: calling extension function without a current context\n");
145 #include "glapitemp.h"
147 /***** END NO-OP DISPATCH *****/
152 * \name Current dispatch and current context control variables
154 * Depending on whether or not multithreading is support, and the type of
155 * support available, several variables are used to store the current context
156 * pointer and the current dispatch table pointer. In the non-threaded case,
157 * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this
160 * In the "normal" threaded case, the variables \c _glapi_Dispatch and
161 * \c _glapi_Context will be \c NULL if an application is detected as being
162 * multithreaded. Single-threaded applications will use \c _glapi_Dispatch
163 * and \c _glapi_Context just like the case without any threading support.
164 * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state
165 * data \c _gl_DispatchTSD and \c ContextTSD are used. Drivers and the
166 * static dispatch functions access these variables via \c _glapi_get_dispatch
167 * and \c _glapi_get_context.
169 * There is a race condition in setting \c _glapi_Dispatch to \c NULL. It is
170 * possible for the original thread to be setting it at the same instant a new
171 * thread, perhaps running on a different processor, is clearing it. Because
172 * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is
173 * used to determine whether or not the application is multithreaded.
175 * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are
176 * hardcoded to \c NULL. Instead the TLS variables \c _glapi_tls_Dispatch and
177 * \c _glapi_tls_Context are used. Having \c _glapi_Dispatch and
178 * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability
179 * between TLS enabled loaders and non-TLS DRI drivers.
182 #if defined(GLX_USE_TLS)
184 PUBLIC __thread
struct _glapi_table
* _glapi_tls_Dispatch
185 __attribute__((tls_model("initial-exec")))
186 = (struct _glapi_table
*) __glapi_noop_table
;
188 PUBLIC __thread
void * _glapi_tls_Context
189 __attribute__((tls_model("initial-exec")));
191 PUBLIC
const struct _glapi_table
*_glapi_Dispatch
= NULL
;
192 PUBLIC
const void *_glapi_Context
= NULL
;
198 static GLboolean ThreadSafe
= GL_FALSE
; /**< In thread-safe mode? */
199 _glthread_TSD _gl_DispatchTSD
; /**< Per-thread dispatch pointer */
200 static _glthread_TSD ContextTSD
; /**< Per-thread context pointer */
202 #if defined(WIN32_THREADS)
203 void FreeTSD(_glthread_TSD
*p
);
204 void FreeAllTSD(void)
206 FreeTSD(&_gl_DispatchTSD
);
207 FreeTSD(&ContextTSD
);
209 #endif /* defined(WIN32_THREADS) */
211 #endif /* defined(THREADS) */
213 PUBLIC
struct _glapi_table
*_glapi_Dispatch
=
214 (struct _glapi_table
*) __glapi_noop_table
;
215 PUBLIC
void *_glapi_Context
= NULL
;
217 #endif /* defined(GLX_USE_TLS) */
222 * strdup() is actually not a standard ANSI C or POSIX routine.
223 * Irix will not define it if ANSI mode is in effect.
226 str_dup(const char *str
)
229 copy
= (char*) malloc(strlen(str
) + 1);
239 * We should call this periodically from a function such as glXMakeCurrent
240 * in order to test if multiple threads are being used.
243 _glapi_check_multithread(void)
245 #if defined(THREADS) && !defined(GLX_USE_TLS)
247 static unsigned long knownID
;
248 static GLboolean firstCall
= GL_TRUE
;
250 knownID
= _glthread_GetID();
251 firstCall
= GL_FALSE
;
253 else if (knownID
!= _glthread_GetID()) {
254 ThreadSafe
= GL_TRUE
;
255 _glapi_set_dispatch(NULL
);
256 _glapi_set_context(NULL
);
259 else if (!_glapi_get_dispatch()) {
260 /* make sure that this thread's dispatch pointer isn't null */
261 _glapi_set_dispatch(NULL
);
269 * Set the current context pointer for this thread.
270 * The context pointer is an opaque type which should be cast to
271 * void from the real context pointer type.
274 _glapi_set_context(void *context
)
276 (void) __unused_noop_functions
; /* silence a warning */
277 #if defined(GLX_USE_TLS)
278 _glapi_tls_Context
= context
;
279 #elif defined(THREADS)
280 _glthread_SetTSD(&ContextTSD
, context
);
281 _glapi_Context
= (ThreadSafe
) ? NULL
: context
;
283 _glapi_Context
= context
;
290 * Get the current context pointer for this thread.
291 * The context pointer is an opaque type which should be cast from
292 * void to the real context pointer type.
295 _glapi_get_context(void)
297 #if defined(GLX_USE_TLS)
298 return _glapi_tls_Context
;
299 #elif defined(THREADS)
301 return _glthread_GetTSD(&ContextTSD
);
304 return _glapi_Context
;
307 return _glapi_Context
;
314 * Set the global or per-thread dispatch table pointer.
315 * If the dispatch parameter is NULL we'll plug in the no-op dispatch
316 * table (__glapi_noop_table).
319 _glapi_set_dispatch(struct _glapi_table
*dispatch
)
321 #if defined(PTHREADS) || defined(GLX_USE_TLS)
322 static pthread_once_t once_control
= PTHREAD_ONCE_INIT
;
323 pthread_once( & once_control
, init_glapi_relocs
);
327 /* use the no-op functions */
328 dispatch
= (struct _glapi_table
*) __glapi_noop_table
;
332 _glapi_check_table(dispatch
);
336 #if defined(GLX_USE_TLS)
337 _glapi_tls_Dispatch
= dispatch
;
338 #elif defined(THREADS)
339 _glthread_SetTSD(&_gl_DispatchTSD
, (void *) dispatch
);
340 _glapi_Dispatch
= (ThreadSafe
) ? NULL
: dispatch
;
342 _glapi_Dispatch
= dispatch
;
349 * Return pointer to current dispatch table for calling thread.
351 PUBLIC
struct _glapi_table
*
352 _glapi_get_dispatch(void)
354 struct _glapi_table
* api
;
355 #if defined(GLX_USE_TLS)
356 api
= _glapi_tls_Dispatch
;
357 #elif defined(THREADS)
359 ? (struct _glapi_table
*) _glthread_GetTSD(&_gl_DispatchTSD
)
362 api
= _glapi_Dispatch
;
370 *** The rest of this file is pretty much concerned with GetProcAddress
374 #if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)
375 # define DISPATCH_FUNCTION_SIZE 16
376 #elif defined(USE_X86_ASM)
377 # if defined(THREADS) && !defined(GLX_USE_TLS)
378 # define DISPATCH_FUNCTION_SIZE 32
380 # define DISPATCH_FUNCTION_SIZE 16
384 #if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer)
385 # define NEED_FUNCTION_POINTER
388 /* The code in this file is auto-generated with Python */
393 * Search the table of static entrypoint functions for the named function
394 * and return the corresponding glprocs_table_t entry.
396 static const glprocs_table_t
*
397 find_entry( const char * n
)
400 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
401 const char *testName
= gl_string_table
+ static_functions
[i
].Name_offset
;
402 if (strcmp(testName
, n
) == 0) {
403 return &static_functions
[i
];
411 * Return dispatch table offset of the named static (built-in) function.
412 * Return -1 if function not found.
415 get_static_proc_offset(const char *funcName
)
417 const glprocs_table_t
* const f
= find_entry( funcName
);
425 #if !defined(XFree86Server) && !defined(XGLServer)
428 #if defined( GLX_USE_TLS )
429 extern GLubyte gl_dispatch_functions_start
[];
430 extern GLubyte gl_dispatch_functions_end
[];
432 extern const GLubyte gl_dispatch_functions_start
[];
435 #endif /* USE_X86_ASM */
439 * Return dispatch function address for the named static (built-in) function.
440 * Return NULL if function not found.
443 get_static_proc_address(const char *funcName
)
445 const glprocs_table_t
* const f
= find_entry( funcName
);
447 #if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING)
448 return (f
->Address
== NULL
)
449 ? (_glapi_proc
) (gl_dispatch_functions_start
450 + (DISPATCH_FUNCTION_SIZE
* f
->Offset
))
452 #elif defined(DISPATCH_FUNCTION_SIZE)
453 return (_glapi_proc
) (gl_dispatch_functions_start
454 + (DISPATCH_FUNCTION_SIZE
* f
->Offset
));
464 #endif /* !defined(XFree86Server) && !defined(XGLServer) */
469 * Return the name of the function at the given offset in the dispatch
470 * table. For debugging only.
473 get_static_proc_name( GLuint offset
)
476 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
477 if (static_functions
[i
].Offset
== offset
) {
478 return gl_string_table
+ static_functions
[i
].Name_offset
;
486 /**********************************************************************
487 * Extension function management.
491 * Number of extension functions which we can dynamically add at runtime.
493 #define MAX_EXTENSION_FUNCS 300
497 * The dispatch table size (number of entries) is the size of the
498 * _glapi_table struct plus the number of dynamic entries we can add.
499 * The extra slots can be filled in by DRI drivers that register new extension
502 #define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
506 * Track information about a function added to the GL API.
508 struct _glapi_function
{
510 * Name of the function.
516 * Text string that describes the types of the parameters passed to the
517 * named function. Parameter types are converted to characters using the
519 * - 'i' for \c GLint, \c GLuint, and \c GLenum
520 * - 'p' for any pointer type
521 * - 'f' for \c GLfloat and \c GLclampf
522 * - 'd' for \c GLdouble and \c GLclampd
524 const char * parameter_signature
;
528 * Offset in the dispatch table where the pointer to the real function is
529 * located. If the driver has not requested that the named function be
530 * added to the dispatch table, this will have the value ~0.
532 unsigned dispatch_offset
;
536 * Pointer to the dispatch stub for the named function.
539 * The semantic of this field should be changed slightly. Currently, it
540 * is always expected to be non-\c NULL. However, it would be better to
541 * only allocate the entry-point stub when the application requests the
542 * function via \c glXGetProcAddress. This would save memory for all the
543 * functions that the driver exports but that the application never wants
546 _glapi_proc dispatch_stub
;
550 static struct _glapi_function ExtEntryTable
[MAX_EXTENSION_FUNCS
];
551 static GLuint NumExtEntryPoints
= 0;
554 extern void __glapi_sparc_icache_flush(unsigned int *);
558 * Generate a dispatch function (entrypoint) which jumps through
559 * the given slot number (offset) in the current dispatch table.
560 * We need assembly language in order to accomplish this.
563 generate_entrypoint(GLuint functionOffset
)
565 #if defined(USE_X86_ASM)
566 /* 32 is chosen as something of a magic offset. For x86, the dispatch
567 * at offset 32 is the first one where the offset in the
568 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
570 const GLubyte
* const template_func
= gl_dispatch_functions_start
571 + (DISPATCH_FUNCTION_SIZE
* 32);
572 GLubyte
* const code
= (GLubyte
*) malloc(DISPATCH_FUNCTION_SIZE
);
575 if ( code
!= NULL
) {
576 (void) memcpy(code
, template_func
, DISPATCH_FUNCTION_SIZE
);
577 fill_in_entrypoint_offset( (_glapi_proc
) code
, functionOffset
);
580 return (_glapi_proc
) code
;
581 #elif defined(USE_SPARC_ASM)
584 static const unsigned int insn_template
[] = {
585 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */
586 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
587 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */
588 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */
589 0x8528b020, /* sllx %g2, 32, %g2 */
590 0xc2584002, /* ldx [%g1 + %g2], %g1 */
591 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */
592 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */
593 0xc6584002, /* ldx [%g1 + %g2], %g3 */
594 0x81c0c000, /* jmpl %g3, %g0 */
598 static const unsigned int insn_template
[] = {
599 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
600 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
601 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */
602 0x81c0c000, /* jmpl %g3, %g0 */
605 #endif /* __arch64__ */
606 unsigned int *code
= (unsigned int *) malloc(sizeof(insn_template
));
607 unsigned long glapi_addr
= (unsigned long) &_glapi_Dispatch
;
609 memcpy(code
, insn_template
, sizeof(insn_template
));
612 code
[0] |= (glapi_addr
>> (32 + 10));
613 code
[1] |= ((glapi_addr
& 0xffffffff) >> 10);
614 __glapi_sparc_icache_flush(&code
[0]);
615 code
[2] |= ((glapi_addr
>> 32) & ((1 << 10) - 1));
616 code
[3] |= (glapi_addr
& ((1 << 10) - 1));
617 __glapi_sparc_icache_flush(&code
[2]);
618 code
[6] |= ((functionOffset
* 8) >> 10);
619 code
[7] |= ((functionOffset
* 8) & ((1 << 10) - 1));
620 __glapi_sparc_icache_flush(&code
[6]);
622 code
[0] |= (glapi_addr
>> 10);
623 code
[1] |= (glapi_addr
& ((1 << 10) - 1));
624 __glapi_sparc_icache_flush(&code
[0]);
625 code
[2] |= (functionOffset
* 4);
626 __glapi_sparc_icache_flush(&code
[2]);
627 #endif /* __arch64__ */
629 return (_glapi_proc
) code
;
631 (void) functionOffset
;
633 #endif /* USE_*_ASM */
638 * This function inserts a new dispatch offset into the assembly language
639 * stub that was generated with the preceeding function.
642 fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
)
644 #if defined(USE_X86_ASM)
645 GLubyte
* const code
= (GLubyte
*) entrypoint
;
647 #if DISPATCH_FUNCTION_SIZE == 32
648 *((unsigned int *)(code
+ 11)) = 4 * offset
;
649 *((unsigned int *)(code
+ 22)) = 4 * offset
;
650 #elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS )
651 *((unsigned int *)(code
+ 8)) = 4 * offset
;
652 #elif DISPATCH_FUNCTION_SIZE == 16
653 *((unsigned int *)(code
+ 7)) = 4 * offset
;
655 # error Invalid DISPATCH_FUNCTION_SIZE!
658 #elif defined(USE_SPARC_ASM)
660 /* XXX this hasn't been tested! */
661 unsigned int *code
= (unsigned int *) entrypoint
;
663 code
[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */
664 code
[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */
665 code
[6] |= ((offset
* 8) >> 10);
666 code
[7] |= ((offset
* 8) & ((1 << 10) - 1));
667 __glapi_sparc_icache_flush(&code
[6]);
668 #else /* __arch64__ */
669 code
[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */
670 code
[2] |= (offset
* 4);
671 __glapi_sparc_icache_flush(&code
[2]);
672 #endif /* __arch64__ */
676 /* an unimplemented architecture */
680 #endif /* USE_*_ASM */
685 * Generate new entrypoint
687 * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
688 * calls \c _glapi_add_dispatch we'll put in the proper offset. If that
689 * never happens, and the user calls this function, he'll segfault. That's
690 * what you get when you try calling a GL function that doesn't really exist.
692 * \param funcName Name of the function to create an entry-point for.
694 * \sa _glapi_add_entrypoint
697 static struct _glapi_function
*
698 add_function_name( const char * funcName
)
700 struct _glapi_function
* entry
= NULL
;
702 if (NumExtEntryPoints
< MAX_EXTENSION_FUNCS
) {
703 _glapi_proc entrypoint
= generate_entrypoint(~0);
704 if (entrypoint
!= NULL
) {
705 entry
= & ExtEntryTable
[NumExtEntryPoints
];
707 ExtEntryTable
[NumExtEntryPoints
].name
= str_dup(funcName
);
708 ExtEntryTable
[NumExtEntryPoints
].parameter_signature
= NULL
;
709 ExtEntryTable
[NumExtEntryPoints
].dispatch_offset
= ~0;
710 ExtEntryTable
[NumExtEntryPoints
].dispatch_stub
= entrypoint
;
720 * Fill-in the dispatch stub for the named function.
722 * This function is intended to be called by a hardware driver. When called,
723 * a dispatch stub may be created created for the function. A pointer to this
724 * dispatch function will be returned by glXGetProcAddress.
726 * \param function_names Array of pointers to function names that should
727 * share a common dispatch offset.
728 * \param parameter_signature String representing the types of the parameters
729 * passed to the named function. Parameter types
730 * are converted to characters using the following
732 * - 'i' for \c GLint, \c GLuint, and \c GLenum
733 * - 'p' for any pointer type
734 * - 'f' for \c GLfloat and \c GLclampf
735 * - 'd' for \c GLdouble and \c GLclampd
738 * The offset in the dispatch table of the named function. A pointer to the
739 * driver's implementation of the named function should be stored at
740 * \c dispatch_table[\c offset].
742 * \sa glXGetProcAddress
745 * This function can only handle up to 8 names at a time. As far as I know,
746 * the maximum number of names ever associated with an existing GL function is
747 * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
748 * \c glPointParameterfARB, and \c glPointParameterf), so this should not be
749 * too painful of a limitation.
752 * Determine whether or not \c parameter_signature should be allowed to be
753 * \c NULL. It doesn't seem like much of a hardship for drivers to have to
754 * pass in an empty string.
757 * Determine if code should be added to reject function names that start with
761 * Add code to compare \c parameter_signature with the parameter signature of
762 * a static function. In order to do that, we need to find a way to \b get
763 * the parameter signature of a static function.
767 _glapi_add_dispatch( const char * const * function_names
,
768 const char * parameter_signature
)
770 static int next_dynamic_offset
= _gloffset_FIRST_DYNAMIC
;
771 const char * const real_sig
= (parameter_signature
!= NULL
)
772 ? parameter_signature
: "";
773 struct _glapi_function
* entry
[8];
774 GLboolean is_static
[8];
781 (void) memset( is_static
, 0, sizeof( is_static
) );
782 (void) memset( entry
, 0, sizeof( entry
) );
784 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
785 /* Do some trivial validation on the name of the function.
788 if (!function_names
[i
] || function_names
[i
][0] != 'g' || function_names
[i
][1] != 'l')
791 /* Determine if the named function already exists. If the function does
792 * exist, it must have the same parameter signature as the function
796 new_offset
= get_static_proc_offset(function_names
[i
]);
797 if (new_offset
>= 0) {
798 /* FIXME: Make sure the parameter signatures match! How do we get
799 * FIXME: the parameter signature for static functions?
802 if ( (offset
!= ~0) && (new_offset
!= offset
) ) {
806 is_static
[i
] = GL_TRUE
;
811 for ( j
= 0 ; j
< NumExtEntryPoints
; j
++ ) {
812 if (strcmp(ExtEntryTable
[j
].name
, function_names
[i
]) == 0) {
813 /* The offset may be ~0 if the function name was added by
814 * glXGetProcAddress but never filled in by the driver.
817 if (ExtEntryTable
[j
].dispatch_offset
!= ~0) {
818 if (strcmp(real_sig
, ExtEntryTable
[j
].parameter_signature
)
823 if ( (offset
!= ~0) && (ExtEntryTable
[j
].dispatch_offset
!= offset
) ) {
827 offset
= ExtEntryTable
[j
].dispatch_offset
;
830 entry
[i
] = & ExtEntryTable
[j
];
837 offset
= next_dynamic_offset
;
838 next_dynamic_offset
++;
841 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
842 if (! is_static
[i
] ) {
843 if (entry
[i
] == NULL
) {
844 entry
[i
] = add_function_name( function_names
[i
] );
845 if (entry
[i
] == NULL
) {
846 /* FIXME: Possible memory leak here.
852 entry
[i
]->parameter_signature
= str_dup(real_sig
);
853 fill_in_entrypoint_offset(entry
[i
]->dispatch_stub
, offset
);
854 entry
[i
]->dispatch_offset
= offset
;
863 * Return offset of entrypoint for named function within dispatch table.
866 _glapi_get_proc_offset(const char *funcName
)
868 /* search extension functions first */
870 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
871 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
872 return ExtEntryTable
[i
].dispatch_offset
;
875 /* search static functions */
876 return get_static_proc_offset(funcName
);
882 * Return pointer to the named function. If the function name isn't found
883 * in the name of static functions, try generating a new API entrypoint on
884 * the fly with assembly language.
887 _glapi_get_proc_address(const char *funcName
)
889 struct _glapi_function
* entry
;
893 if (funcName
[0] != 'm' || funcName
[1] != 'g' || funcName
[2] != 'l')
896 if (funcName
[0] != 'g' || funcName
[1] != 'l')
900 /* search extension functions first */
901 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
902 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
903 return ExtEntryTable
[i
].dispatch_stub
;
907 #if !defined( XFree86Server ) && !defined( XGLServer )
908 /* search static functions */
910 const _glapi_proc func
= get_static_proc_address(funcName
);
914 #endif /* !defined( XFree86Server ) */
916 entry
= add_function_name(funcName
);
917 return (entry
== NULL
) ? NULL
: entry
->dispatch_stub
;
923 * Return the name of the function at the given dispatch offset.
924 * This is only intended for debugging.
927 _glapi_get_proc_name(GLuint offset
)
932 /* search built-in functions */
933 n
= get_static_proc_name(offset
);
938 /* search added extension functions */
939 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
940 if (ExtEntryTable
[i
].dispatch_offset
== offset
) {
941 return ExtEntryTable
[i
].name
;
950 * Return size of dispatch table struct as number of functions (or
954 _glapi_get_dispatch_table_size(void)
956 return DISPATCH_TABLE_SIZE
;
962 * Make sure there are no NULL pointers in the given dispatch table.
963 * Intended for debugging purposes.
966 _glapi_check_table(const struct _glapi_table
*table
)
969 const GLuint entries
= _glapi_get_dispatch_table_size();
970 const void **tab
= (const void **) table
;
972 for (i
= 1; i
< entries
; i
++) {
976 /* Do some spot checks to be sure that the dispatch table
977 * slots are assigned correctly.
980 GLuint BeginOffset
= _glapi_get_proc_offset("glBegin");
981 char *BeginFunc
= (char*) &table
->Begin
;
982 GLuint offset
= (BeginFunc
- (char *) table
) / sizeof(void *);
983 assert(BeginOffset
== _gloffset_Begin
);
984 assert(BeginOffset
== offset
);
987 GLuint viewportOffset
= _glapi_get_proc_offset("glViewport");
988 char *viewportFunc
= (char*) &table
->Viewport
;
989 GLuint offset
= (viewportFunc
- (char *) table
) / sizeof(void *);
990 assert(viewportOffset
== _gloffset_Viewport
);
991 assert(viewportOffset
== offset
);
994 GLuint VertexPointerOffset
= _glapi_get_proc_offset("glVertexPointer");
995 char *VertexPointerFunc
= (char*) &table
->VertexPointer
;
996 GLuint offset
= (VertexPointerFunc
- (char *) table
) / sizeof(void *);
997 assert(VertexPointerOffset
== _gloffset_VertexPointer
);
998 assert(VertexPointerOffset
== offset
);
1001 GLuint ResetMinMaxOffset
= _glapi_get_proc_offset("glResetMinmax");
1002 char *ResetMinMaxFunc
= (char*) &table
->ResetMinmax
;
1003 GLuint offset
= (ResetMinMaxFunc
- (char *) table
) / sizeof(void *);
1004 assert(ResetMinMaxOffset
== _gloffset_ResetMinmax
);
1005 assert(ResetMinMaxOffset
== offset
);
1008 GLuint blendColorOffset
= _glapi_get_proc_offset("glBlendColor");
1009 char *blendColorFunc
= (char*) &table
->BlendColor
;
1010 GLuint offset
= (blendColorFunc
- (char *) table
) / sizeof(void *);
1011 assert(blendColorOffset
== _gloffset_BlendColor
);
1012 assert(blendColorOffset
== offset
);
1015 GLuint secondaryColor3fOffset
= _glapi_get_proc_offset("glSecondaryColor3fEXT");
1016 char *secondaryColor3fFunc
= (char*) &table
->SecondaryColor3fEXT
;
1017 GLuint offset
= (secondaryColor3fFunc
- (char *) table
) / sizeof(void *);
1018 assert(secondaryColor3fOffset
== _gloffset_SecondaryColor3fEXT
);
1019 assert(secondaryColor3fOffset
== offset
);
1022 GLuint pointParameterivOffset
= _glapi_get_proc_offset("glPointParameterivNV");
1023 char *pointParameterivFunc
= (char*) &table
->PointParameterivNV
;
1024 GLuint offset
= (pointParameterivFunc
- (char *) table
) / sizeof(void *);
1025 assert(pointParameterivOffset
== _gloffset_PointParameterivNV
);
1026 assert(pointParameterivOffset
== offset
);
1029 GLuint setFenceOffset
= _glapi_get_proc_offset("glSetFenceNV");
1030 char *setFenceFunc
= (char*) &table
->SetFenceNV
;
1031 GLuint offset
= (setFenceFunc
- (char *) table
) / sizeof(void *);
1032 assert(setFenceOffset
== _gloffset_SetFenceNV
);
1033 assert(setFenceOffset
== offset
);
1041 #if defined(PTHREADS) || defined(GLX_USE_TLS)
1043 * Perform platform-specific GL API entry-point fixups.
1046 init_glapi_relocs( void )
1048 #if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
1049 extern unsigned long _x86_get_dispatch(void);
1050 char run_time_patch
[] = {
1051 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
1053 GLuint
*offset
= (GLuint
*) &run_time_patch
[2]; /* 32-bits for x86/32 */
1054 const GLubyte
* const get_disp
= (const GLubyte
*) run_time_patch
;
1055 GLubyte
* curr_func
= (GLubyte
*) gl_dispatch_functions_start
;
1057 *offset
= _x86_get_dispatch();
1058 while ( curr_func
!= (GLubyte
*) gl_dispatch_functions_end
) {
1059 (void) memcpy( curr_func
, get_disp
, sizeof(run_time_patch
));
1060 curr_func
+= DISPATCH_FUNCTION_SIZE
;
1064 #endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */