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>
56 #include <X11/Xfuncproto.h>
57 #define PUBLIC _X_EXPORT
72 #include "glapioffsets.h"
73 #include "glapitable.h"
75 /***** BEGIN NO-OP DISPATCH *****/
77 static GLboolean WarnFlag = GL_FALSE;
78 static _glapi_warning_func warning_func;
80 #if defined(PTHREADS) || defined(GLX_USE_TLS)
81 static void init_glapi_relocs(void);
84 static _glapi_proc generate_entrypoint(GLuint functionOffset);
85 static void fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset);
88 * Enable/disable printing of warning messages.
91 _glapi_noop_enable_warnings(GLboolean enable)
97 * Register a callback function for reporting errors.
100 _glapi_set_warning_func( _glapi_warning_func func )
108 if ((WarnFlag || getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
117 #if defined(__GNUC__) && (__GNUC__ > 2)
118 #define possibly_unused __attribute((unused))
120 #define possibly_unused
123 #define KEYWORD1 static
124 #define KEYWORD1_ALT static
125 #define KEYWORD2 GLAPIENTRY possibly_unused
126 #define NAME(func) NoOp##func
130 #define DISPATCH(func, args, msg) \
132 warning_func(NULL, "GL User Error: called without context: %s", #func); \
135 #define RETURN_DISPATCH(func, args, msg) \
137 warning_func(NULL, "GL User Error: called without context: %s", #func); \
141 #define DISPATCH_TABLE_NAME __glapi_noop_table
142 #define UNUSED_TABLE_NAME __unused_noop_functions
144 #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
146 static GLint NoOpUnused(void)
149 warning_func(NULL, "GL User Error: calling extension function without a current context\n");
154 #include "glapitemp.h"
156 /***** END NO-OP DISPATCH *****/
161 * \name Current dispatch and current context control variables
163 * Depending on whether or not multithreading is support, and the type of
164 * support available, several variables are used to store the current context
165 * pointer and the current dispatch table pointer. In the non-threaded case,
166 * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this
169 * In the "normal" threaded case, the variables \c _glapi_Dispatch and
170 * \c _glapi_Context will be \c NULL if an application is detected as being
171 * multithreaded. Single-threaded applications will use \c _glapi_Dispatch
172 * and \c _glapi_Context just like the case without any threading support.
173 * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state
174 * data \c _gl_DispatchTSD and \c ContextTSD are used. Drivers and the
175 * static dispatch functions access these variables via \c _glapi_get_dispatch
176 * and \c _glapi_get_context.
178 * There is a race condition in setting \c _glapi_Dispatch to \c NULL. It is
179 * possible for the original thread to be setting it at the same instant a new
180 * thread, perhaps running on a different processor, is clearing it. Because
181 * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is
182 * used to determine whether or not the application is multithreaded.
184 * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are
185 * hardcoded to \c NULL. Instead the TLS variables \c _glapi_tls_Dispatch and
186 * \c _glapi_tls_Context are used. Having \c _glapi_Dispatch and
187 * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability
188 * between TLS enabled loaders and non-TLS DRI drivers.
191 #if defined(GLX_USE_TLS)
193 PUBLIC __thread struct _glapi_table * _glapi_tls_Dispatch
194 __attribute__((tls_model("initial-exec")))
195 = (struct _glapi_table *) __glapi_noop_table;
197 PUBLIC __thread void * _glapi_tls_Context
198 __attribute__((tls_model("initial-exec")));
200 PUBLIC const struct _glapi_table *_glapi_Dispatch = NULL;
201 PUBLIC const void *_glapi_Context = NULL;
207 static GLboolean ThreadSafe = GL_FALSE; /**< In thread-safe mode? */
208 _glthread_TSD _gl_DispatchTSD; /**< Per-thread dispatch pointer */
209 static _glthread_TSD ContextTSD; /**< Per-thread context pointer */
211 #if defined(WIN32_THREADS)
212 void FreeTSD(_glthread_TSD *p);
213 void FreeAllTSD(void)
215 FreeTSD(&_gl_DispatchTSD);
216 FreeTSD(&ContextTSD);
218 #endif /* defined(WIN32_THREADS) */
220 #endif /* defined(THREADS) */
222 PUBLIC struct _glapi_table *_glapi_Dispatch =
223 (struct _glapi_table *) __glapi_noop_table;
224 PUBLIC void *_glapi_Context = NULL;
226 #endif /* defined(GLX_USE_TLS) */
231 * strdup() is actually not a standard ANSI C or POSIX routine.
232 * Irix will not define it if ANSI mode is in effect.
235 str_dup(const char *str)
238 copy = (char*) malloc(strlen(str) + 1);
248 * We should call this periodically from a function such as glXMakeCurrent
249 * in order to test if multiple threads are being used.
252 _glapi_check_multithread(void)
254 #if defined(THREADS) && !defined(GLX_USE_TLS)
256 static unsigned long knownID;
257 static GLboolean firstCall = GL_TRUE;
259 knownID = _glthread_GetID();
260 firstCall = GL_FALSE;
262 else if (knownID != _glthread_GetID()) {
263 ThreadSafe = GL_TRUE;
264 _glapi_set_dispatch(NULL);
265 _glapi_set_context(NULL);
268 else if (!_glapi_get_dispatch()) {
269 /* make sure that this thread's dispatch pointer isn't null */
270 _glapi_set_dispatch(NULL);
278 * Set the current context pointer for this thread.
279 * The context pointer is an opaque type which should be cast to
280 * void from the real context pointer type.
283 _glapi_set_context(void *context)
285 (void) __unused_noop_functions; /* silence a warning */
286 #if defined(GLX_USE_TLS)
287 _glapi_tls_Context = context;
288 #elif defined(THREADS)
289 _glthread_SetTSD(&ContextTSD, context);
290 _glapi_Context = (ThreadSafe) ? NULL : context;
292 _glapi_Context = context;
299 * Get the current context pointer for this thread.
300 * The context pointer is an opaque type which should be cast from
301 * void to the real context pointer type.
304 _glapi_get_context(void)
306 #if defined(GLX_USE_TLS)
307 return _glapi_tls_Context;
308 #elif defined(THREADS)
310 return _glthread_GetTSD(&ContextTSD);
313 return _glapi_Context;
316 return _glapi_Context;
323 * Set the global or per-thread dispatch table pointer.
324 * If the dispatch parameter is NULL we'll plug in the no-op dispatch
325 * table (__glapi_noop_table).
328 _glapi_set_dispatch(struct _glapi_table *dispatch)
330 #if defined(PTHREADS) || defined(GLX_USE_TLS)
331 static pthread_once_t once_control = PTHREAD_ONCE_INIT;
332 pthread_once( & once_control, init_glapi_relocs );
336 /* use the no-op functions */
337 dispatch = (struct _glapi_table *) __glapi_noop_table;
341 _glapi_check_table(dispatch);
345 #if defined(GLX_USE_TLS)
346 _glapi_tls_Dispatch = dispatch;
347 #elif defined(THREADS)
348 _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
349 _glapi_Dispatch = (ThreadSafe) ? NULL : dispatch;
351 _glapi_Dispatch = dispatch;
358 * Return pointer to current dispatch table for calling thread.
360 PUBLIC struct _glapi_table *
361 _glapi_get_dispatch(void)
363 struct _glapi_table * api;
364 #if defined(GLX_USE_TLS)
365 api = _glapi_tls_Dispatch;
366 #elif defined(THREADS)
368 ? (struct _glapi_table *) _glthread_GetTSD(&_gl_DispatchTSD)
371 api = _glapi_Dispatch;
379 *** The rest of this file is pretty much concerned with GetProcAddress
383 #if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)
384 # define DISPATCH_FUNCTION_SIZE 16
385 #elif defined(USE_X86_ASM)
386 # if defined(THREADS) && !defined(GLX_USE_TLS)
387 # define DISPATCH_FUNCTION_SIZE 32
389 # define DISPATCH_FUNCTION_SIZE 16
393 #if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer)
394 # define NEED_FUNCTION_POINTER
397 /* The code in this file is auto-generated with Python */
402 * Search the table of static entrypoint functions for the named function
403 * and return the corresponding glprocs_table_t entry.
405 static const glprocs_table_t *
406 find_entry( const char * n )
409 for (i = 0; static_functions[i].Name_offset >= 0; i++) {
410 const char *testName = gl_string_table + static_functions[i].Name_offset;
411 if (strcmp(testName, n) == 0) {
412 return &static_functions[i];
420 * Return dispatch table offset of the named static (built-in) function.
421 * Return -1 if function not found.
424 get_static_proc_offset(const char *funcName)
426 const glprocs_table_t * const f = find_entry( funcName );
434 #if !defined(XFree86Server) && !defined(XGLServer)
437 #if defined( GLX_USE_TLS )
438 extern GLubyte gl_dispatch_functions_start[];
439 extern GLubyte gl_dispatch_functions_end[];
441 extern const GLubyte gl_dispatch_functions_start[];
444 #endif /* USE_X86_ASM */
448 * Return dispatch function address for the named static (built-in) function.
449 * Return NULL if function not found.
452 get_static_proc_address(const char *funcName)
454 const glprocs_table_t * const f = find_entry( funcName );
456 #if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING)
457 return (f->Address == NULL)
458 ? (_glapi_proc) (gl_dispatch_functions_start
459 + (DISPATCH_FUNCTION_SIZE * f->Offset))
461 #elif defined(DISPATCH_FUNCTION_SIZE)
462 return (_glapi_proc) (gl_dispatch_functions_start
463 + (DISPATCH_FUNCTION_SIZE * f->Offset));
473 #endif /* !defined(XFree86Server) && !defined(XGLServer) */
478 * Return the name of the function at the given offset in the dispatch
479 * table. For debugging only.
482 get_static_proc_name( GLuint offset )
485 for (i = 0; static_functions[i].Name_offset >= 0; i++) {
486 if (static_functions[i].Offset == offset) {
487 return gl_string_table + static_functions[i].Name_offset;
495 /**********************************************************************
496 * Extension function management.
500 * Number of extension functions which we can dynamically add at runtime.
502 #define MAX_EXTENSION_FUNCS 300
506 * The dispatch table size (number of entries) is the size of the
507 * _glapi_table struct plus the number of dynamic entries we can add.
508 * The extra slots can be filled in by DRI drivers that register new extension
511 #define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
515 * Track information about a function added to the GL API.
517 struct _glapi_function {
519 * Name of the function.
525 * Text string that describes the types of the parameters passed to the
526 * named function. Parameter types are converted to characters using the
528 * - 'i' for \c GLint, \c GLuint, and \c GLenum
529 * - 'p' for any pointer type
530 * - 'f' for \c GLfloat and \c GLclampf
531 * - 'd' for \c GLdouble and \c GLclampd
533 const char * parameter_signature;
537 * Offset in the dispatch table where the pointer to the real function is
538 * located. If the driver has not requested that the named function be
539 * added to the dispatch table, this will have the value ~0.
541 unsigned dispatch_offset;
545 * Pointer to the dispatch stub for the named function.
548 * The semantic of this field should be changed slightly. Currently, it
549 * is always expected to be non-\c NULL. However, it would be better to
550 * only allocate the entry-point stub when the application requests the
551 * function via \c glXGetProcAddress. This would save memory for all the
552 * functions that the driver exports but that the application never wants
555 _glapi_proc dispatch_stub;
559 static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];
560 static GLuint NumExtEntryPoints = 0;
563 extern void __glapi_sparc_icache_flush(unsigned int *);
567 * Generate a dispatch function (entrypoint) which jumps through
568 * the given slot number (offset) in the current dispatch table.
569 * We need assembly language in order to accomplish this.
572 generate_entrypoint(GLuint functionOffset)
574 #if defined(USE_X86_ASM)
575 /* 32 is chosen as something of a magic offset. For x86, the dispatch
576 * at offset 32 is the first one where the offset in the
577 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
579 const GLubyte * const template_func = gl_dispatch_functions_start
580 + (DISPATCH_FUNCTION_SIZE * 32);
581 GLubyte * const code = (GLubyte *) malloc(DISPATCH_FUNCTION_SIZE);
584 if ( code != NULL ) {
585 (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE);
586 fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset );
589 return (_glapi_proc) code;
590 #elif defined(USE_SPARC_ASM)
593 static const unsigned int insn_template[] = {
594 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */
595 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
596 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */
597 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */
598 0x8528b020, /* sllx %g2, 32, %g2 */
599 0xc2584002, /* ldx [%g1 + %g2], %g1 */
600 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */
601 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */
602 0xc6584002, /* ldx [%g1 + %g2], %g3 */
603 0x81c0c000, /* jmpl %g3, %g0 */
607 static const unsigned int insn_template[] = {
608 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
609 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
610 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */
611 0x81c0c000, /* jmpl %g3, %g0 */
614 #endif /* __arch64__ */
615 unsigned int *code = (unsigned int *) malloc(sizeof(insn_template));
616 unsigned long glapi_addr = (unsigned long) &_glapi_Dispatch;
618 memcpy(code, insn_template, sizeof(insn_template));
621 code[0] |= (glapi_addr >> (32 + 10));
622 code[1] |= ((glapi_addr & 0xffffffff) >> 10);
623 __glapi_sparc_icache_flush(&code[0]);
624 code[2] |= ((glapi_addr >> 32) & ((1 << 10) - 1));
625 code[3] |= (glapi_addr & ((1 << 10) - 1));
626 __glapi_sparc_icache_flush(&code[2]);
627 code[6] |= ((functionOffset * 8) >> 10);
628 code[7] |= ((functionOffset * 8) & ((1 << 10) - 1));
629 __glapi_sparc_icache_flush(&code[6]);
631 code[0] |= (glapi_addr >> 10);
632 code[1] |= (glapi_addr & ((1 << 10) - 1));
633 __glapi_sparc_icache_flush(&code[0]);
634 code[2] |= (functionOffset * 4);
635 __glapi_sparc_icache_flush(&code[2]);
636 #endif /* __arch64__ */
638 return (_glapi_proc) code;
640 (void) functionOffset;
642 #endif /* USE_*_ASM */
647 * This function inserts a new dispatch offset into the assembly language
648 * stub that was generated with the preceeding function.
651 fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
653 #if defined(USE_X86_ASM)
654 GLubyte * const code = (GLubyte *) entrypoint;
656 #if DISPATCH_FUNCTION_SIZE == 32
657 *((unsigned int *)(code + 11)) = 4 * offset;
658 *((unsigned int *)(code + 22)) = 4 * offset;
659 #elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS )
660 *((unsigned int *)(code + 8)) = 4 * offset;
661 #elif DISPATCH_FUNCTION_SIZE == 16
662 *((unsigned int *)(code + 7)) = 4 * offset;
664 # error Invalid DISPATCH_FUNCTION_SIZE!
667 #elif defined(USE_SPARC_ASM)
669 /* XXX this hasn't been tested! */
670 unsigned int *code = (unsigned int *) entrypoint;
672 code[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */
673 code[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */
674 code[6] |= ((offset * 8) >> 10);
675 code[7] |= ((offset * 8) & ((1 << 10) - 1));
676 __glapi_sparc_icache_flush(&code[6]);
677 #else /* __arch64__ */
678 code[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */
679 code[2] |= (offset * 4);
680 __glapi_sparc_icache_flush(&code[2]);
681 #endif /* __arch64__ */
685 /* an unimplemented architecture */
689 #endif /* USE_*_ASM */
694 * Generate new entrypoint
696 * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
697 * calls \c _glapi_add_dispatch we'll put in the proper offset. If that
698 * never happens, and the user calls this function, he'll segfault. That's
699 * what you get when you try calling a GL function that doesn't really exist.
701 * \param funcName Name of the function to create an entry-point for.
703 * \sa _glapi_add_entrypoint
706 static struct _glapi_function *
707 add_function_name( const char * funcName )
709 struct _glapi_function * entry = NULL;
711 if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) {
712 _glapi_proc entrypoint = generate_entrypoint(~0);
713 if (entrypoint != NULL) {
714 entry = & ExtEntryTable[NumExtEntryPoints];
716 ExtEntryTable[NumExtEntryPoints].name = str_dup(funcName);
717 ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL;
718 ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0;
719 ExtEntryTable[NumExtEntryPoints].dispatch_stub = entrypoint;
729 * Fill-in the dispatch stub for the named function.
731 * This function is intended to be called by a hardware driver. When called,
732 * a dispatch stub may be created created for the function. A pointer to this
733 * dispatch function will be returned by glXGetProcAddress.
735 * \param function_names Array of pointers to function names that should
736 * share a common dispatch offset.
737 * \param parameter_signature String representing the types of the parameters
738 * passed to the named function. Parameter types
739 * are converted to characters using the following
741 * - 'i' for \c GLint, \c GLuint, and \c GLenum
742 * - 'p' for any pointer type
743 * - 'f' for \c GLfloat and \c GLclampf
744 * - 'd' for \c GLdouble and \c GLclampd
747 * The offset in the dispatch table of the named function. A pointer to the
748 * driver's implementation of the named function should be stored at
749 * \c dispatch_table[\c offset].
751 * \sa glXGetProcAddress
754 * This function can only handle up to 8 names at a time. As far as I know,
755 * the maximum number of names ever associated with an existing GL function is
756 * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
757 * \c glPointParameterfARB, and \c glPointParameterf), so this should not be
758 * too painful of a limitation.
761 * Determine whether or not \c parameter_signature should be allowed to be
762 * \c NULL. It doesn't seem like much of a hardship for drivers to have to
763 * pass in an empty string.
766 * Determine if code should be added to reject function names that start with
770 * Add code to compare \c parameter_signature with the parameter signature of
771 * a static function. In order to do that, we need to find a way to \b get
772 * the parameter signature of a static function.
776 _glapi_add_dispatch( const char * const * function_names,
777 const char * parameter_signature )
779 static int next_dynamic_offset = _gloffset_FIRST_DYNAMIC;
780 const char * const real_sig = (parameter_signature != NULL)
781 ? parameter_signature : "";
782 struct _glapi_function * entry[8];
783 GLboolean is_static[8];
790 (void) memset( is_static, 0, sizeof( is_static ) );
791 (void) memset( entry, 0, sizeof( entry ) );
793 for ( i = 0 ; function_names[i] != NULL ; i++ ) {
794 /* Do some trivial validation on the name of the function.
797 if (!function_names[i] || function_names[i][0] != 'g' || function_names[i][1] != 'l')
800 /* Determine if the named function already exists. If the function does
801 * exist, it must have the same parameter signature as the function
805 new_offset = get_static_proc_offset(function_names[i]);
806 if (new_offset >= 0) {
807 /* FIXME: Make sure the parameter signatures match! How do we get
808 * FIXME: the parameter signature for static functions?
811 if ( (offset != ~0) && (new_offset != offset) ) {
815 is_static[i] = GL_TRUE;
820 for ( j = 0 ; j < NumExtEntryPoints ; j++ ) {
821 if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) {
822 /* The offset may be ~0 if the function name was added by
823 * glXGetProcAddress but never filled in by the driver.
826 if (ExtEntryTable[j].dispatch_offset != ~0) {
827 if (strcmp(real_sig, ExtEntryTable[j].parameter_signature)
832 if ( (offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset) ) {
836 offset = ExtEntryTable[j].dispatch_offset;
839 entry[i] = & ExtEntryTable[j];
846 offset = next_dynamic_offset;
847 next_dynamic_offset++;
850 for ( i = 0 ; function_names[i] != NULL ; i++ ) {
851 if (! is_static[i] ) {
852 if (entry[i] == NULL) {
853 entry[i] = add_function_name( function_names[i] );
854 if (entry[i] == NULL) {
855 /* FIXME: Possible memory leak here.
861 entry[i]->parameter_signature = str_dup(real_sig);
862 fill_in_entrypoint_offset(entry[i]->dispatch_stub, offset);
863 entry[i]->dispatch_offset = offset;
872 * Return offset of entrypoint for named function within dispatch table.
875 _glapi_get_proc_offset(const char *funcName)
877 /* search extension functions first */
879 for (i = 0; i < NumExtEntryPoints; i++) {
880 if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
881 return ExtEntryTable[i].dispatch_offset;
884 /* search static functions */
885 return get_static_proc_offset(funcName);
891 * Return pointer to the named function. If the function name isn't found
892 * in the name of static functions, try generating a new API entrypoint on
893 * the fly with assembly language.
896 _glapi_get_proc_address(const char *funcName)
898 struct _glapi_function * entry;
902 if (funcName[0] != 'm' || funcName[1] != 'g' || funcName[2] != 'l')
905 if (funcName[0] != 'g' || funcName[1] != 'l')
909 /* search extension functions first */
910 for (i = 0; i < NumExtEntryPoints; i++) {
911 if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
912 return ExtEntryTable[i].dispatch_stub;
916 #if !defined( XFree86Server ) && !defined( XGLServer )
917 /* search static functions */
919 const _glapi_proc func = get_static_proc_address(funcName);
923 #endif /* !defined( XFree86Server ) */
925 entry = add_function_name(funcName);
926 return (entry == NULL) ? NULL : entry->dispatch_stub;
932 * Return the name of the function at the given dispatch offset.
933 * This is only intended for debugging.
936 _glapi_get_proc_name(GLuint offset)
941 /* search built-in functions */
942 n = get_static_proc_name(offset);
947 /* search added extension functions */
948 for (i = 0; i < NumExtEntryPoints; i++) {
949 if (ExtEntryTable[i].dispatch_offset == offset) {
950 return ExtEntryTable[i].name;
959 * Return size of dispatch table struct as number of functions (or
963 _glapi_get_dispatch_table_size(void)
965 return DISPATCH_TABLE_SIZE;
971 * Make sure there are no NULL pointers in the given dispatch table.
972 * Intended for debugging purposes.
975 _glapi_check_table(const struct _glapi_table *table)
978 const GLuint entries = _glapi_get_dispatch_table_size();
979 const void **tab = (const void **) table;
981 for (i = 1; i < entries; i++) {
985 /* Do some spot checks to be sure that the dispatch table
986 * slots are assigned correctly.
989 GLuint BeginOffset = _glapi_get_proc_offset("glBegin");
990 char *BeginFunc = (char*) &table->Begin;
991 GLuint offset = (BeginFunc - (char *) table) / sizeof(void *);
992 assert(BeginOffset == _gloffset_Begin);
993 assert(BeginOffset == offset);
996 GLuint viewportOffset = _glapi_get_proc_offset("glViewport");
997 char *viewportFunc = (char*) &table->Viewport;
998 GLuint offset = (viewportFunc - (char *) table) / sizeof(void *);
999 assert(viewportOffset == _gloffset_Viewport);
1000 assert(viewportOffset == offset);
1003 GLuint VertexPointerOffset = _glapi_get_proc_offset("glVertexPointer");
1004 char *VertexPointerFunc = (char*) &table->VertexPointer;
1005 GLuint offset = (VertexPointerFunc - (char *) table) / sizeof(void *);
1006 assert(VertexPointerOffset == _gloffset_VertexPointer);
1007 assert(VertexPointerOffset == offset);
1010 GLuint ResetMinMaxOffset = _glapi_get_proc_offset("glResetMinmax");
1011 char *ResetMinMaxFunc = (char*) &table->ResetMinmax;
1012 GLuint offset = (ResetMinMaxFunc - (char *) table) / sizeof(void *);
1013 assert(ResetMinMaxOffset == _gloffset_ResetMinmax);
1014 assert(ResetMinMaxOffset == offset);
1017 GLuint blendColorOffset = _glapi_get_proc_offset("glBlendColor");
1018 char *blendColorFunc = (char*) &table->BlendColor;
1019 GLuint offset = (blendColorFunc - (char *) table) / sizeof(void *);
1020 assert(blendColorOffset == _gloffset_BlendColor);
1021 assert(blendColorOffset == offset);
1024 GLuint secondaryColor3fOffset = _glapi_get_proc_offset("glSecondaryColor3fEXT");
1025 char *secondaryColor3fFunc = (char*) &table->SecondaryColor3fEXT;
1026 GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *);
1027 assert(secondaryColor3fOffset == _gloffset_SecondaryColor3fEXT);
1028 assert(secondaryColor3fOffset == offset);
1031 GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV");
1032 char *pointParameterivFunc = (char*) &table->PointParameterivNV;
1033 GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *);
1034 assert(pointParameterivOffset == _gloffset_PointParameterivNV);
1035 assert(pointParameterivOffset == offset);
1038 GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV");
1039 char *setFenceFunc = (char*) &table->SetFenceNV;
1040 GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *);
1041 assert(setFenceOffset == _gloffset_SetFenceNV);
1042 assert(setFenceOffset == offset);
1050 #if defined(PTHREADS) || defined(GLX_USE_TLS)
1052 * Perform platform-specific GL API entry-point fixups.
1055 init_glapi_relocs( void )
1057 #if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
1058 extern unsigned long _x86_get_dispatch(void);
1059 char run_time_patch[] = {
1060 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
1062 GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
1063 const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
1064 GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
1066 *offset = _x86_get_dispatch();
1067 while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
1068 (void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
1069 curr_func += DISPATCH_FUNCTION_SIZE;
1073 #endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */