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 #if defined(PTHREADS) || defined(GLX_USE_TLS)
64 static void init_glapi_relocs(void);
67 static _glapi_proc
generate_entrypoint(GLuint functionOffset
);
68 static void fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
);
71 * Enable/disable printing of warning messages.
74 _glapi_noop_enable_warnings(GLboolean enable
)
80 * Register a callback function for reporting errors.
83 _glapi_set_warning_func( _glapi_warning_func func
)
91 if ((WarnFlag
|| getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
101 #define KEYWORD1 static
102 #define KEYWORD1_ALT static
103 #define KEYWORD2 GLAPIENTRY
104 #define NAME(func) NoOp##func
108 #define DISPATCH(func, args, msg) \
110 warning_func(NULL, "GL User Error: called without context: %s", #func); \
113 #define RETURN_DISPATCH(func, args, msg) \
115 warning_func(NULL, "GL User Error: called without context: %s", #func); \
119 #define DISPATCH_TABLE_NAME __glapi_noop_table
120 #define UNUSED_TABLE_NAME __unused_noop_functions
122 #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
124 static GLint
NoOpUnused(void)
127 warning_func(NULL
, "GL User Error: calling extension function without a current context\n");
132 #include "glapitemp.h"
134 /***** END NO-OP DISPATCH *****/
139 * \name Current dispatch and current context control variables
141 * Depending on whether or not multithreading is support, and the type of
142 * support available, several variables are used to store the current context
143 * pointer and the current dispatch table pointer. In the non-threaded case,
144 * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this
147 * In the "normal" threaded case, the variables \c _glapi_Dispatch and
148 * \c _glapi_Context will be \c NULL if an application is detected as being
149 * multithreaded. Single-threaded applications will use \c _glapi_Dispatch
150 * and \c _glapi_Context just like the case without any threading support.
151 * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state
152 * data \c _gl_DispatchTSD and \c ContextTSD are used. Drivers and the
153 * static dispatch functions access these variables via \c _glapi_get_dispatch
154 * and \c _glapi_get_context.
156 * There is a race condition in setting \c _glapi_Dispatch to \c NULL. It is
157 * possible for the original thread to be setting it at the same instant a new
158 * thread, perhaps running on a different processor, is clearing it. Because
159 * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is
160 * used to determine whether or not the application is multithreaded.
162 * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are
163 * hardcoded to \c NULL. Instead the TLS variables \c _glapi_tls_Dispatch and
164 * \c _glapi_tls_Context are used. Having \c _glapi_Dispatch and
165 * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability
166 * between TLS enabled loaders and non-TLS DRI drivers.
169 #if defined(GLX_USE_TLS)
171 PUBLIC __thread
struct _glapi_table
* _glapi_tls_Dispatch
172 __attribute__((tls_model("initial-exec")))
173 = (struct _glapi_table
*) __glapi_noop_table
;
175 PUBLIC __thread
void * _glapi_tls_Context
176 __attribute__((tls_model("initial-exec")));
178 PUBLIC
const struct _glapi_table
*_glapi_Dispatch
= NULL
;
179 PUBLIC
const void *_glapi_Context
= NULL
;
185 static GLboolean ThreadSafe
= GL_FALSE
; /**< In thread-safe mode? */
186 _glthread_TSD _gl_DispatchTSD
; /**< Per-thread dispatch pointer */
187 static _glthread_TSD ContextTSD
; /**< Per-thread context pointer */
189 #if defined(WIN32_THREADS)
190 void FreeTSD(_glthread_TSD
*p
);
191 void FreeAllTSD(void)
193 FreeTSD(&_gl_DispatchTSD
);
194 FreeTSD(&ContextTSD
);
196 #endif /* defined(WIN32_THREADS) */
198 #endif /* defined(THREADS) */
200 PUBLIC
struct _glapi_table
*_glapi_Dispatch
=
201 (struct _glapi_table
*) __glapi_noop_table
;
202 PUBLIC
void *_glapi_Context
= NULL
;
204 #endif /* defined(GLX_USE_TLS) */
209 * strdup() is actually not a standard ANSI C or POSIX routine.
210 * Irix will not define it if ANSI mode is in effect.
213 str_dup(const char *str
)
216 copy
= (char*) malloc(strlen(str
) + 1);
226 * We should call this periodically from a function such as glXMakeCurrent
227 * in order to test if multiple threads are being used.
230 _glapi_check_multithread(void)
232 #if defined(THREADS) && !defined(GLX_USE_TLS)
234 static unsigned long knownID
;
235 static GLboolean firstCall
= GL_TRUE
;
237 knownID
= _glthread_GetID();
238 firstCall
= GL_FALSE
;
240 else if (knownID
!= _glthread_GetID()) {
241 ThreadSafe
= GL_TRUE
;
242 _glapi_set_dispatch(NULL
);
245 else if (!_glapi_get_dispatch()) {
246 /* make sure that this thread's dispatch pointer isn't null */
247 _glapi_set_dispatch(NULL
);
255 * Set the current context pointer for this thread.
256 * The context pointer is an opaque type which should be cast to
257 * void from the real context pointer type.
260 _glapi_set_context(void *context
)
262 (void) __unused_noop_functions
; /* silence a warning */
263 #if defined(GLX_USE_TLS)
264 _glapi_tls_Context
= context
;
265 #elif defined(THREADS)
266 _glthread_SetTSD(&ContextTSD
, context
);
267 _glapi_Context
= (ThreadSafe
) ? NULL
: context
;
269 _glapi_Context
= context
;
276 * Get the current context pointer for this thread.
277 * The context pointer is an opaque type which should be cast from
278 * void to the real context pointer type.
281 _glapi_get_context(void)
283 #if defined(GLX_USE_TLS)
284 return _glapi_tls_Context
;
285 #elif defined(THREADS)
287 return _glthread_GetTSD(&ContextTSD
);
290 return _glapi_Context
;
293 return _glapi_Context
;
300 * Set the global or per-thread dispatch table pointer.
301 * If the dispatch parameter is NULL we'll plug in the no-op dispatch
302 * table (__glapi_noop_table).
305 _glapi_set_dispatch(struct _glapi_table
*dispatch
)
307 #if defined(PTHREADS) || defined(GLX_USE_TLS)
308 static pthread_once_t once_control
= PTHREAD_ONCE_INIT
;
309 pthread_once( & once_control
, init_glapi_relocs
);
313 /* use the no-op functions */
314 dispatch
= (struct _glapi_table
*) __glapi_noop_table
;
318 _glapi_check_table(dispatch
);
322 #if defined(GLX_USE_TLS)
323 _glapi_tls_Dispatch
= dispatch
;
324 #elif defined(THREADS)
325 _glthread_SetTSD(&_gl_DispatchTSD
, (void *) dispatch
);
326 _glapi_Dispatch
= (ThreadSafe
) ? NULL
: dispatch
;
328 _glapi_Dispatch
= dispatch
;
335 * Return pointer to current dispatch table for calling thread.
337 PUBLIC
struct _glapi_table
*
338 _glapi_get_dispatch(void)
340 struct _glapi_table
* api
;
341 #if defined(GLX_USE_TLS)
342 api
= _glapi_tls_Dispatch
;
343 #elif defined(THREADS)
345 ? (struct _glapi_table
*) _glthread_GetTSD(&_gl_DispatchTSD
)
348 api
= _glapi_Dispatch
;
356 *** The rest of this file is pretty much concerned with GetProcAddress
360 #if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)
361 # define DISPATCH_FUNCTION_SIZE 16
362 #elif defined(USE_X86_ASM)
363 # if defined(THREADS) && !defined(GLX_USE_TLS)
364 # define DISPATCH_FUNCTION_SIZE 32
366 # define DISPATCH_FUNCTION_SIZE 16
370 #if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer)
371 # define NEED_FUNCTION_POINTER
374 /* The code in this file is auto-generated with Python */
379 * Search the table of static entrypoint functions for the named function
380 * and return the corresponding glprocs_table_t entry.
382 static const glprocs_table_t
*
383 find_entry( const char * n
)
386 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
387 const char *testName
= gl_string_table
+ static_functions
[i
].Name_offset
;
388 if (strcmp(testName
, n
) == 0) {
389 return &static_functions
[i
];
397 * Return dispatch table offset of the named static (built-in) function.
398 * Return -1 if function not found.
401 get_static_proc_offset(const char *funcName
)
403 const glprocs_table_t
* const f
= find_entry( funcName
);
411 #if !defined(XFree86Server) && !defined(XGLServer)
414 #if defined( GLX_USE_TLS )
415 extern GLubyte gl_dispatch_functions_start
[];
416 extern GLubyte gl_dispatch_functions_end
[];
418 extern const GLubyte gl_dispatch_functions_start
[];
421 #endif /* USE_X86_ASM */
425 * Return dispatch function address for the named static (built-in) function.
426 * Return NULL if function not found.
429 get_static_proc_address(const char *funcName
)
431 const glprocs_table_t
* const f
= find_entry( funcName
);
433 #if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING)
434 return (f
->Address
== NULL
)
435 ? (_glapi_proc
) (gl_dispatch_functions_start
436 + (DISPATCH_FUNCTION_SIZE
* f
->Offset
));
438 #elif defined(DISPATCH_FUNCTION_SIZE)
439 return (_glapi_proc
) (gl_dispatch_functions_start
440 + (DISPATCH_FUNCTION_SIZE
* f
->Offset
));
450 #endif /* !defined(XFree86Server) && !defined(XGLServer) */
455 * Return the name of the function at the given offset in the dispatch
456 * table. For debugging only.
459 get_static_proc_name( GLuint offset
)
462 for (i
= 0; static_functions
[i
].Name_offset
>= 0; i
++) {
463 if (static_functions
[i
].Offset
== offset
) {
464 return gl_string_table
+ static_functions
[i
].Name_offset
;
472 /**********************************************************************
473 * Extension function management.
477 * Number of extension functions which we can dynamically add at runtime.
479 #define MAX_EXTENSION_FUNCS 300
483 * The dispatch table size (number of entries) is the size of the
484 * _glapi_table struct plus the number of dynamic entries we can add.
485 * The extra slots can be filled in by DRI drivers that register new extension
488 #define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
492 * Track information about a function added to the GL API.
494 struct _glapi_function
{
496 * Name of the function.
502 * Text string that describes the types of the parameters passed to the
503 * named function. Parameter types are converted to characters using the
505 * - 'i' for \c GLint, \c GLuint, and \c GLenum
506 * - 'p' for any pointer type
507 * - 'f' for \c GLfloat and \c GLclampf
508 * - 'd' for \c GLdouble and \c GLclampd
510 const char * parameter_signature
;
514 * Offset in the dispatch table where the pointer to the real function is
515 * located. If the driver has not requested that the named function be
516 * added to the dispatch table, this will have the value ~0.
518 unsigned dispatch_offset
;
522 * Pointer to the dispatch stub for the named function.
525 * The semantic of this field should be changed slightly. Currently, it
526 * is always expected to be non-\c NULL. However, it would be better to
527 * only allocate the entry-point stub when the application requests the
528 * function via \c glXGetProcAddress. This would save memory for all the
529 * functions that the driver exports but that the application never wants
532 _glapi_proc dispatch_stub
;
536 static struct _glapi_function ExtEntryTable
[MAX_EXTENSION_FUNCS
];
537 static GLuint NumExtEntryPoints
= 0;
540 extern void __glapi_sparc_icache_flush(unsigned int *);
544 * Generate a dispatch function (entrypoint) which jumps through
545 * the given slot number (offset) in the current dispatch table.
546 * We need assembly language in order to accomplish this.
549 generate_entrypoint(GLuint functionOffset
)
551 #if defined(USE_X86_ASM)
552 /* 32 is chosen as something of a magic offset. For x86, the dispatch
553 * at offset 32 is the first one where the offset in the
554 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
556 const GLubyte
* const template_func
= gl_dispatch_functions_start
557 + (DISPATCH_FUNCTION_SIZE
* 32);
558 GLubyte
* const code
= (GLubyte
*) malloc(DISPATCH_FUNCTION_SIZE
);
561 if ( code
!= NULL
) {
562 (void) memcpy(code
, template_func
, DISPATCH_FUNCTION_SIZE
);
563 fill_in_entrypoint_offset( (_glapi_proc
) code
, functionOffset
);
566 return (_glapi_proc
) code
;
567 #elif defined(USE_SPARC_ASM)
570 static const unsigned int insn_template
[] = {
571 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */
572 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
573 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */
574 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */
575 0x8528b020, /* sllx %g2, 32, %g2 */
576 0xc2584002, /* ldx [%g1 + %g2], %g1 */
577 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */
578 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */
579 0xc6584002, /* ldx [%g1 + %g2], %g3 */
580 0x81c0c000, /* jmpl %g3, %g0 */
584 static const unsigned int insn_template
[] = {
585 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
586 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
587 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */
588 0x81c0c000, /* jmpl %g3, %g0 */
591 #endif /* __arch64__ */
592 unsigned int *code
= (unsigned int *) malloc(sizeof(insn_template
));
593 unsigned long glapi_addr
= (unsigned long) &_glapi_Dispatch
;
595 memcpy(code
, insn_template
, sizeof(insn_template
));
598 code
[0] |= (glapi_addr
>> (32 + 10));
599 code
[1] |= ((glapi_addr
& 0xffffffff) >> 10);
600 __glapi_sparc_icache_flush(&code
[0]);
601 code
[2] |= ((glapi_addr
>> 32) & ((1 << 10) - 1));
602 code
[3] |= (glapi_addr
& ((1 << 10) - 1));
603 __glapi_sparc_icache_flush(&code
[2]);
604 code
[6] |= ((functionOffset
* 8) >> 10);
605 code
[7] |= ((functionOffset
* 8) & ((1 << 10) - 1));
606 __glapi_sparc_icache_flush(&code
[6]);
608 code
[0] |= (glapi_addr
>> 10);
609 code
[1] |= (glapi_addr
& ((1 << 10) - 1));
610 __glapi_sparc_icache_flush(&code
[0]);
611 code
[2] |= (functionOffset
* 4);
612 __glapi_sparc_icache_flush(&code
[2]);
613 #endif /* __arch64__ */
615 return (_glapi_proc
) code
;
617 (void) functionOffset
;
619 #endif /* USE_*_ASM */
624 * This function inserts a new dispatch offset into the assembly language
625 * stub that was generated with the preceeding function.
628 fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
)
630 #if defined(USE_X86_ASM)
631 GLubyte
* const code
= (GLubyte
*) entrypoint
;
633 #if DISPATCH_FUNCTION_SIZE == 32
634 *((unsigned int *)(code
+ 11)) = 4 * offset
;
635 *((unsigned int *)(code
+ 22)) = 4 * offset
;
636 #elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS )
637 *((unsigned int *)(code
+ 8)) = 4 * offset
;
638 #elif DISPATCH_FUNCTION_SIZE == 16
639 *((unsigned int *)(code
+ 7)) = 4 * offset
;
641 # error Invalid DISPATCH_FUNCTION_SIZE!
644 #elif defined(USE_SPARC_ASM)
646 /* XXX this hasn't been tested! */
647 unsigned int *code
= (unsigned int *) entrypoint
;
649 code
[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */
650 code
[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */
651 code
[6] |= ((offset
* 8) >> 10);
652 code
[7] |= ((offset
* 8) & ((1 << 10) - 1));
653 __glapi_sparc_icache_flush(&code
[6]);
654 #else /* __arch64__ */
655 code
[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */
656 code
[2] |= (offset
* 4);
657 __glapi_sparc_icache_flush(&code
[2]);
658 #endif /* __arch64__ */
662 /* an unimplemented architecture */
666 #endif /* USE_*_ASM */
671 * Generate new entrypoint
673 * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
674 * calls \c _glapi_add_dispatch we'll put in the proper offset. If that
675 * never happens, and the user calls this function, he'll segfault. That's
676 * what you get when you try calling a GL function that doesn't really exist.
678 * \param funcName Name of the function to create an entry-point for.
680 * \sa _glapi_add_entrypoint
683 static struct _glapi_function
*
684 add_function_name( const char * funcName
)
686 struct _glapi_function
* entry
= NULL
;
688 if (NumExtEntryPoints
< MAX_EXTENSION_FUNCS
) {
689 _glapi_proc entrypoint
= generate_entrypoint(~0);
690 if (entrypoint
!= NULL
) {
691 entry
= & ExtEntryTable
[NumExtEntryPoints
];
693 ExtEntryTable
[NumExtEntryPoints
].name
= str_dup(funcName
);
694 ExtEntryTable
[NumExtEntryPoints
].parameter_signature
= NULL
;
695 ExtEntryTable
[NumExtEntryPoints
].dispatch_offset
= ~0;
696 ExtEntryTable
[NumExtEntryPoints
].dispatch_stub
= entrypoint
;
706 * Fill-in the dispatch stub for the named function.
708 * This function is intended to be called by a hardware driver. When called,
709 * a dispatch stub may be created created for the function. A pointer to this
710 * dispatch function will be returned by glXGetProcAddress.
712 * \param function_names Array of pointers to function names that should
713 * share a common dispatch offset.
714 * \param parameter_signature String representing the types of the parameters
715 * passed to the named function. Parameter types
716 * are converted to characters using the following
718 * - 'i' for \c GLint, \c GLuint, and \c GLenum
719 * - 'p' for any pointer type
720 * - 'f' for \c GLfloat and \c GLclampf
721 * - 'd' for \c GLdouble and \c GLclampd
724 * The offset in the dispatch table of the named function. A pointer to the
725 * driver's implementation of the named function should be stored at
726 * \c dispatch_table[\c offset].
728 * \sa glXGetProcAddress
731 * This function can only handle up to 8 names at a time. As far as I know,
732 * the maximum number of names ever associated with an existing GL function is
733 * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
734 * \c glPointParameterfARB, and \c glPointParameterf), so this should not be
735 * too painful of a limitation.
738 * Determine whether or not \c parameter_signature should be allowed to be
739 * \c NULL. It doesn't seem like much of a hardship for drivers to have to
740 * pass in an empty string.
743 * Determine if code should be added to reject function names that start with
747 * Add code to compare \c parameter_signature with the parameter signature of
748 * a static function. In order to do that, we need to find a way to \b get
749 * the parameter signature of a static function.
753 _glapi_add_dispatch( const char * const * function_names
,
754 const char * parameter_signature
)
756 static int next_dynamic_offset
= _gloffset_FIRST_DYNAMIC
;
757 const char * const real_sig
= (parameter_signature
!= NULL
)
758 ? parameter_signature
: "";
759 struct _glapi_function
* entry
[8];
760 GLboolean is_static
[8];
767 (void) memset( is_static
, 0, sizeof( is_static
) );
768 (void) memset( entry
, 0, sizeof( entry
) );
770 for ( i
= 0 ; function_names
[i
] != NULL
; i
++ ) {
771 /* Do some trivial validation on the name of the function.
774 if (!function_names
[i
] || function_names
[i
][0] != 'g' || function_names
[i
][1] != 'l')
777 /* Determine if the named function already exists. If the function does
778 * exist, it must have the same parameter signature as the function
782 new_offset
= get_static_proc_offset(function_names
[i
]);
783 if (new_offset
>= 0) {
784 /* FIXME: Make sure the parameter signatures match! How do we get
785 * FIXME: the parameter signature for static functions?
788 if ( (offset
!= ~0) && (new_offset
!= offset
) ) {
792 is_static
[i
] = GL_TRUE
;
797 for ( j
= 0 ; j
< NumExtEntryPoints
; j
++ ) {
798 if (strcmp(ExtEntryTable
[j
].name
, function_names
[i
]) == 0) {
799 /* The offset may be ~0 if the function name was added by
800 * glXGetProcAddress but never filled in by the driver.
803 if (ExtEntryTable
[j
].dispatch_offset
!= ~0) {
804 if (strcmp(real_sig
, ExtEntryTable
[j
].parameter_signature
)
809 if ( (offset
!= ~0) && (ExtEntryTable
[j
].dispatch_offset
!= offset
) ) {
813 offset
= ExtEntryTable
[j
].dispatch_offset
;
816 entry
[i
] = & ExtEntryTable
[j
];
823 offset
= next_dynamic_offset
;
824 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.
838 entry
[i
]->parameter_signature
= str_dup(real_sig
);
839 fill_in_entrypoint_offset(entry
[i
]->dispatch_stub
, offset
);
840 entry
[i
]->dispatch_offset
= offset
;
849 * Return offset of entrypoint for named function within dispatch table.
852 _glapi_get_proc_offset(const char *funcName
)
854 /* search extension functions first */
856 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
857 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
858 return ExtEntryTable
[i
].dispatch_offset
;
861 /* search static functions */
862 return get_static_proc_offset(funcName
);
868 * Return pointer to the named function. If the function name isn't found
869 * in the name of static functions, try generating a new API entrypoint on
870 * the fly with assembly language.
873 _glapi_get_proc_address(const char *funcName
)
875 struct _glapi_function
* entry
;
879 if (funcName
[0] != 'm' || funcName
[1] != 'g' || funcName
[2] != 'l')
882 if (funcName
[0] != 'g' || funcName
[1] != 'l')
886 /* search extension functions first */
887 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
888 if (strcmp(ExtEntryTable
[i
].name
, funcName
) == 0) {
889 return ExtEntryTable
[i
].dispatch_stub
;
893 #if !defined( XFree86Server ) && !defined( XGLServer )
894 /* search static functions */
896 const _glapi_proc func
= get_static_proc_address(funcName
);
900 #endif /* !defined( XFree86Server ) */
902 entry
= add_function_name(funcName
);
903 return (entry
== NULL
) ? NULL
: entry
->dispatch_stub
;
909 * Return the name of the function at the given dispatch offset.
910 * This is only intended for debugging.
913 _glapi_get_proc_name(GLuint offset
)
918 /* search built-in functions */
919 n
= get_static_proc_name(offset
);
924 /* search added extension functions */
925 for (i
= 0; i
< NumExtEntryPoints
; i
++) {
926 if (ExtEntryTable
[i
].dispatch_offset
== offset
) {
927 return ExtEntryTable
[i
].name
;
936 * Return size of dispatch table struct as number of functions (or
940 _glapi_get_dispatch_table_size(void)
942 return DISPATCH_TABLE_SIZE
;
948 * Make sure there are no NULL pointers in the given dispatch table.
949 * Intended for debugging purposes.
952 _glapi_check_table(const struct _glapi_table
*table
)
955 const GLuint entries
= _glapi_get_dispatch_table_size();
956 const void **tab
= (const void **) table
;
958 for (i
= 1; i
< entries
; i
++) {
962 /* Do some spot checks to be sure that the dispatch table
963 * slots are assigned correctly.
966 GLuint BeginOffset
= _glapi_get_proc_offset("glBegin");
967 char *BeginFunc
= (char*) &table
->Begin
;
968 GLuint offset
= (BeginFunc
- (char *) table
) / sizeof(void *);
969 assert(BeginOffset
== _gloffset_Begin
);
970 assert(BeginOffset
== offset
);
973 GLuint viewportOffset
= _glapi_get_proc_offset("glViewport");
974 char *viewportFunc
= (char*) &table
->Viewport
;
975 GLuint offset
= (viewportFunc
- (char *) table
) / sizeof(void *);
976 assert(viewportOffset
== _gloffset_Viewport
);
977 assert(viewportOffset
== offset
);
980 GLuint VertexPointerOffset
= _glapi_get_proc_offset("glVertexPointer");
981 char *VertexPointerFunc
= (char*) &table
->VertexPointer
;
982 GLuint offset
= (VertexPointerFunc
- (char *) table
) / sizeof(void *);
983 assert(VertexPointerOffset
== _gloffset_VertexPointer
);
984 assert(VertexPointerOffset
== offset
);
987 GLuint ResetMinMaxOffset
= _glapi_get_proc_offset("glResetMinmax");
988 char *ResetMinMaxFunc
= (char*) &table
->ResetMinmax
;
989 GLuint offset
= (ResetMinMaxFunc
- (char *) table
) / sizeof(void *);
990 assert(ResetMinMaxOffset
== _gloffset_ResetMinmax
);
991 assert(ResetMinMaxOffset
== offset
);
994 GLuint blendColorOffset
= _glapi_get_proc_offset("glBlendColor");
995 char *blendColorFunc
= (char*) &table
->BlendColor
;
996 GLuint offset
= (blendColorFunc
- (char *) table
) / sizeof(void *);
997 assert(blendColorOffset
== _gloffset_BlendColor
);
998 assert(blendColorOffset
== offset
);
1001 GLuint istextureOffset
= _glapi_get_proc_offset("glIsTextureEXT");
1002 char *istextureFunc
= (char*) &table
->IsTextureEXT
;
1003 GLuint offset
= (istextureFunc
- (char *) table
) / sizeof(void *);
1004 assert(istextureOffset
== _gloffset_IsTextureEXT
);
1005 assert(istextureOffset
== offset
);
1008 GLuint secondaryColor3fOffset
= _glapi_get_proc_offset("glSecondaryColor3fEXT");
1009 char *secondaryColor3fFunc
= (char*) &table
->SecondaryColor3fEXT
;
1010 GLuint offset
= (secondaryColor3fFunc
- (char *) table
) / sizeof(void *);
1011 assert(secondaryColor3fOffset
== _gloffset_SecondaryColor3fEXT
);
1012 assert(secondaryColor3fOffset
== offset
);
1013 assert(_glapi_get_proc_address("glSecondaryColor3fEXT") == (_glapi_proc
) &glSecondaryColor3fEXT
);
1016 GLuint pointParameterivOffset
= _glapi_get_proc_offset("glPointParameterivNV");
1017 char *pointParameterivFunc
= (char*) &table
->PointParameterivNV
;
1018 GLuint offset
= (pointParameterivFunc
- (char *) table
) / sizeof(void *);
1019 assert(pointParameterivOffset
== _gloffset_PointParameterivNV
);
1020 assert(pointParameterivOffset
== offset
);
1021 assert(_glapi_get_proc_address("glPointParameterivNV") == (_glapi_proc
) &glPointParameterivNV
);
1024 GLuint setFenceOffset
= _glapi_get_proc_offset("glSetFenceNV");
1025 char *setFenceFunc
= (char*) &table
->SetFenceNV
;
1026 GLuint offset
= (setFenceFunc
- (char *) table
) / sizeof(void *);
1027 assert(setFenceOffset
== _gloffset_SetFenceNV
);
1028 assert(setFenceOffset
== offset
);
1036 #if defined(PTHREADS) || defined(GLX_USE_TLS)
1038 * Perform platform-specific GL API entry-point fixups.
1043 init_glapi_relocs( void )
1045 #if defined( USE_X86_ASM ) && defined( GLX_USE_TLS )
1046 extern void * _x86_get_dispatch(void);
1047 const GLubyte
* const get_disp
= (const GLubyte
*) _x86_get_dispatch
;
1048 GLubyte
* curr_func
= (GLubyte
*) gl_dispatch_functions_start
;
1051 while ( curr_func
!= (GLubyte
*) gl_dispatch_functions_end
) {
1052 (void) memcpy( curr_func
, get_disp
, 6 );
1053 curr_func
+= DISPATCH_FUNCTION_SIZE
;
1055 #endif /* defined( USE_X86_ASM ) && defined( GLX_USE_TLS ) */