117
* Return the name of the function at the given offset in the dispatch
118
* table. For debugging only.
121
get_static_proc_name( GLuint offset )
124
for (i = 0; static_functions[i].Name_offset >= 0; i++) {
125
if (static_functions[i].Offset == offset) {
126
return gl_string_table + static_functions[i].Name_offset;
134
/**********************************************************************
135
* Extension function management.
140
* Track information about a function added to the GL API.
142
struct _glapi_function {
144
* Name of the function.
150
* Text string that describes the types of the parameters passed to the
151
* named function. Parameter types are converted to characters using the
153
* - 'i' for \c GLint, \c GLuint, and \c GLenum
154
* - 'p' for any pointer type
155
* - 'f' for \c GLfloat and \c GLclampf
156
* - 'd' for \c GLdouble and \c GLclampd
158
const char * parameter_signature;
162
* Offset in the dispatch table where the pointer to the real function is
163
* located. If the driver has not requested that the named function be
164
* added to the dispatch table, this will have the value ~0.
166
unsigned dispatch_offset;
170
* Pointer to the dispatch stub for the named function.
173
* The semantic of this field should be changed slightly. Currently, it
174
* is always expected to be non-\c NULL. However, it would be better to
175
* only allocate the entry-point stub when the application requests the
176
* function via \c glXGetProcAddress. This would save memory for all the
177
* functions that the driver exports but that the application never wants
180
_glapi_proc dispatch_stub;
184
static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];
185
static GLuint NumExtEntryPoints = 0;
188
static struct _glapi_function *
189
get_extension_proc(const char *funcName)
192
for (i = 0; i < NumExtEntryPoints; i++) {
193
if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
194
return & ExtEntryTable[i];
202
get_extension_proc_offset(const char *funcName)
204
const struct _glapi_function * const f = get_extension_proc( funcName );
209
return f->dispatch_offset;
214
get_extension_proc_address(const char *funcName)
216
const struct _glapi_function * const f = get_extension_proc( funcName );
221
return f->dispatch_stub;
226
get_extension_proc_name(GLuint offset)
229
for (i = 0; i < NumExtEntryPoints; i++) {
230
if (ExtEntryTable[i].dispatch_offset == offset) {
231
return ExtEntryTable[i].name;
239
* strdup() is actually not a standard ANSI C or POSIX routine.
240
* Irix will not define it if ANSI mode is in effect.
243
str_dup(const char *str)
246
copy = malloc(strlen(str) + 1);
255
* Generate new entrypoint
257
* Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
258
* calls \c _glapi_add_dispatch we'll put in the proper offset. If that
259
* never happens, and the user calls this function, he'll segfault. That's
260
* what you get when you try calling a GL function that doesn't really exist.
262
* \param funcName Name of the function to create an entry-point for.
264
* \sa _glapi_add_entrypoint
267
static struct _glapi_function *
268
add_function_name( const char * funcName )
270
struct _glapi_function * entry = NULL;
271
_glapi_proc entrypoint = NULL;
272
char * name_dup = NULL;
274
if (NumExtEntryPoints >= MAX_EXTENSION_FUNCS)
277
if (funcName == NULL)
280
name_dup = str_dup(funcName);
281
if (name_dup == NULL)
284
entrypoint = generate_entrypoint(~0);
286
if (entrypoint == NULL) {
291
entry = & ExtEntryTable[NumExtEntryPoints];
294
entry->name = name_dup;
295
entry->parameter_signature = NULL;
296
entry->dispatch_offset = ~0;
297
entry->dispatch_stub = entrypoint;
303
static struct _glapi_function *
304
set_entry_info( struct _glapi_function * entry, const char * signature, unsigned offset )
306
char * sig_dup = NULL;
308
if (signature == NULL)
311
sig_dup = str_dup(signature);
315
fill_in_entrypoint_offset(entry->dispatch_stub, offset);
317
entry->parameter_signature = sig_dup;
318
entry->dispatch_offset = offset;
325
* Fill-in the dispatch stub for the named function.
327
* This function is intended to be called by a hardware driver. When called,
328
* a dispatch stub may be created for the function. A pointer to this
329
* dispatch function will be returned by glXGetProcAddress.
331
* \param function_names Array of pointers to function names that should
332
* share a common dispatch offset.
333
* \param parameter_signature String representing the types of the parameters
334
* passed to the named function. Parameter types
335
* are converted to characters using the following
337
* - 'i' for \c GLint, \c GLuint, and \c GLenum
338
* - 'p' for any pointer type
339
* - 'f' for \c GLfloat and \c GLclampf
340
* - 'd' for \c GLdouble and \c GLclampd
343
* The offset in the dispatch table of the named function. A pointer to the
344
* driver's implementation of the named function should be stored at
345
* \c dispatch_table[\c offset]. Return -1 if error/problem.
347
* \sa glXGetProcAddress
350
* This function can only handle up to 8 names at a time. As far as I know,
351
* the maximum number of names ever associated with an existing GL function is
352
* 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
353
* \c glPointParameterfARB, and \c glPointParameterf), so this should not be
354
* too painful of a limitation.
357
* Determine whether or not \c parameter_signature should be allowed to be
358
* \c NULL. It doesn't seem like much of a hardship for drivers to have to
359
* pass in an empty string.
362
* Determine if code should be added to reject function names that start with
366
* Add code to compare \c parameter_signature with the parameter signature of
367
* a static function. In order to do that, we need to find a way to \b get
368
* the parameter signature of a static function.
372
_glapi_add_dispatch( const char * const * function_names,
373
const char * parameter_signature )
375
static int next_dynamic_offset = FIRST_DYNAMIC_OFFSET;
376
const char * const real_sig = (parameter_signature != NULL)
377
? parameter_signature : "";
378
struct _glapi_function * entry[8];
379
GLboolean is_static[8];
383
init_glapi_relocs_once();
385
(void) memset( is_static, 0, sizeof( is_static ) );
386
(void) memset( entry, 0, sizeof( entry ) );
388
/* Find the _single_ dispatch offset for all function names that already
389
* exist (and have a dispatch offset).
392
for ( i = 0 ; function_names[i] != NULL ; i++ ) {
393
const char * funcName = function_names[i];
395
int extension_offset;
397
if (funcName[0] != 'g' || funcName[1] != 'l')
400
/* search built-in functions */
401
static_offset = get_static_proc_offset(funcName);
403
if (static_offset >= 0) {
405
is_static[i] = GL_TRUE;
407
/* FIXME: Make sure the parameter signatures match! How do we get
408
* FIXME: the parameter signature for static functions?
411
if ( (offset != ~0) && (static_offset != offset) ) {
415
offset = static_offset;
420
/* search added extension functions */
421
entry[i] = get_extension_proc(funcName);
423
if (entry[i] != NULL) {
424
extension_offset = entry[i]->dispatch_offset;
426
/* The offset may be ~0 if the function name was added by
427
* glXGetProcAddress but never filled in by the driver.
430
if (extension_offset == ~0) {
434
if (strcmp(real_sig, entry[i]->parameter_signature) != 0) {
438
if ( (offset != ~0) && (extension_offset != offset) ) {
442
offset = extension_offset;
446
/* If all function names are either new (or with no dispatch offset),
447
* allocate a new dispatch offset.
451
offset = next_dynamic_offset;
452
next_dynamic_offset++;
455
/* Fill in the dispatch offset for the new function names (and those with
456
* no dispatch offset).
459
for ( i = 0 ; function_names[i] != NULL ; i++ ) {
464
/* generate entrypoints for new function names */
465
if (entry[i] == NULL) {
466
entry[i] = add_function_name( function_names[i] );
467
if (entry[i] == NULL) {
468
/* FIXME: Possible memory leak here. */
473
if (entry[i]->dispatch_offset == ~0) {
474
set_entry_info( entry[i], real_sig, offset );
483
* Return offset of entrypoint for named function within dispatch table.
486
_glapi_get_proc_offset(const char *funcName)
490
/* search extension functions first */
491
offset = get_extension_proc_offset(funcName);
495
/* search static functions */
496
return get_static_proc_offset(funcName);
502
* Return pointer to the named function. If the function name isn't found
503
* in the name of static functions, try generating a new API entrypoint on
504
* the fly with assembly language.
507
_glapi_get_proc_address(const char *funcName)
510
struct _glapi_function * entry;
512
init_glapi_relocs_once();
514
if (!funcName || funcName[0] != 'g' || funcName[1] != 'l')
517
/* search extension functions first */
518
func = get_extension_proc_address(funcName);
522
/* search static functions */
523
func = get_static_proc_address(funcName);
527
/* generate entrypoint, dispatch offset must be filled in by the driver */
528
entry = add_function_name(funcName);
532
return entry->dispatch_stub;
538
145
* Return the name of the function at the given dispatch offset.
539
146
* This is only intended for debugging.
542
149
_glapi_get_proc_name(GLuint offset)
546
/* search built-in functions */
547
n = get_static_proc_name(offset);
152
for (i = 0; static_functions[i].Name_offset >= 0; i++) {
153
if (static_functions[i].Offset == offset) {
154
return gl_string_table + static_functions[i].Name_offset;
552
/* search added extension functions */
553
return get_extension_proc_name(offset);
added
removed
src/mapi/glapi/glapi_getproc.c
