diff options
Diffstat (limited to 'mesalib/src/mapi/glapi/glapi_getproc.c')
| -rw-r--r-- | mesalib/src/mapi/glapi/glapi_getproc.c | 1332 |
1 files changed, 666 insertions, 666 deletions
diff --git a/mesalib/src/mapi/glapi/glapi_getproc.c b/mesalib/src/mapi/glapi/glapi_getproc.c index 21380ea41..0a6ff7795 100644 --- a/mesalib/src/mapi/glapi/glapi_getproc.c +++ b/mesalib/src/mapi/glapi/glapi_getproc.c @@ -1,666 +1,666 @@ -/*
- * Mesa 3-D graphics library
- * Version: 7.1
- *
- * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-/**
- * \file glapi_getproc.c
- *
- * Code for implementing glXGetProcAddress(), etc.
- * This was originally in glapi.c but refactored out.
- */
-
-
-#include "glapi/glapi_priv.h"
-#include "glapi/glapitable.h"
-
-
-#define FIRST_DYNAMIC_OFFSET (sizeof(struct _glapi_table) / sizeof(void *))
-
-
-/**********************************************************************
- * Static function management.
- */
-
-
-#if !defined(DISPATCH_FUNCTION_SIZE)
-# define NEED_FUNCTION_POINTER
-#endif
-#include "glapi/glprocs.h"
-
-
-/**
- * Search the table of static entrypoint functions for the named function
- * and return the corresponding glprocs_table_t entry.
- */
-static const glprocs_table_t *
-get_static_proc( const char * n )
-{
- GLuint i;
- for (i = 0; static_functions[i].Name_offset >= 0; i++) {
- const char *testName = gl_string_table + static_functions[i].Name_offset;
-#ifdef MANGLE
- /* skip the prefix on the name */
- if (strcmp(testName, n + 1) == 0)
-#else
- if (strcmp(testName, n) == 0)
-#endif
- {
- return &static_functions[i];
- }
- }
- return NULL;
-}
-
-
-/**
- * Return dispatch table offset of the named static (built-in) function.
- * Return -1 if function not found.
- */
-static GLint
-get_static_proc_offset(const char *funcName)
-{
- const glprocs_table_t * const f = get_static_proc( funcName );
- if (f == NULL) {
- return -1;
- }
-
- return f->Offset;
-}
-
-
-
-/**
- * Return dispatch function address for the named static (built-in) function.
- * Return NULL if function not found.
- */
-static _glapi_proc
-get_static_proc_address(const char *funcName)
-{
- const glprocs_table_t * const f = get_static_proc( funcName );
- if (f == NULL) {
- return NULL;
- }
-
-#if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING)
- return (f->Address == NULL)
- ? get_entrypoint_address(f->Offset)
- : f->Address;
-#elif defined(DISPATCH_FUNCTION_SIZE)
- return get_entrypoint_address(f->Offset);
-#else
- return f->Address;
-#endif
-}
-
-
-
-/**
- * Return the name of the function at the given offset in the dispatch
- * table. For debugging only.
- */
-static const char *
-get_static_proc_name( GLuint offset )
-{
- GLuint i;
- for (i = 0; static_functions[i].Name_offset >= 0; i++) {
- if (static_functions[i].Offset == offset) {
- return gl_string_table + static_functions[i].Name_offset;
- }
- }
- return NULL;
-}
-
-
-
-/**********************************************************************
- * Extension function management.
- */
-
-
-/**
- * Track information about a function added to the GL API.
- */
-struct _glapi_function {
- /**
- * Name of the function.
- */
- const char * name;
-
-
- /**
- * Text string that describes the types of the parameters passed to the
- * named function. Parameter types are converted to characters using the
- * following rules:
- * - 'i' for \c GLint, \c GLuint, and \c GLenum
- * - 'p' for any pointer type
- * - 'f' for \c GLfloat and \c GLclampf
- * - 'd' for \c GLdouble and \c GLclampd
- */
- const char * parameter_signature;
-
-
- /**
- * Offset in the dispatch table where the pointer to the real function is
- * located. If the driver has not requested that the named function be
- * added to the dispatch table, this will have the value ~0.
- */
- unsigned dispatch_offset;
-
-
- /**
- * Pointer to the dispatch stub for the named function.
- *
- * \todo
- * The semantic of this field should be changed slightly. Currently, it
- * is always expected to be non-\c NULL. However, it would be better to
- * only allocate the entry-point stub when the application requests the
- * function via \c glXGetProcAddress. This would save memory for all the
- * functions that the driver exports but that the application never wants
- * to call.
- */
- _glapi_proc dispatch_stub;
-};
-
-
-static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];
-static GLuint NumExtEntryPoints = 0;
-
-
-static struct _glapi_function *
-get_extension_proc(const char *funcName)
-{
- GLuint i;
- for (i = 0; i < NumExtEntryPoints; i++) {
- if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
- return & ExtEntryTable[i];
- }
- }
- return NULL;
-}
-
-
-static GLint
-get_extension_proc_offset(const char *funcName)
-{
- const struct _glapi_function * const f = get_extension_proc( funcName );
- if (f == NULL) {
- return -1;
- }
-
- return f->dispatch_offset;
-}
-
-
-static _glapi_proc
-get_extension_proc_address(const char *funcName)
-{
- const struct _glapi_function * const f = get_extension_proc( funcName );
- if (f == NULL) {
- return NULL;
- }
-
- return f->dispatch_stub;
-}
-
-
-static const char *
-get_extension_proc_name(GLuint offset)
-{
- GLuint i;
- for (i = 0; i < NumExtEntryPoints; i++) {
- if (ExtEntryTable[i].dispatch_offset == offset) {
- return ExtEntryTable[i].name;
- }
- }
- return NULL;
-}
-
-
-/**
- * strdup() is actually not a standard ANSI C or POSIX routine.
- * Irix will not define it if ANSI mode is in effect.
- */
-static char *
-str_dup(const char *str)
-{
- char *copy;
- copy = (char*) malloc(strlen(str) + 1);
- if (!copy)
- return NULL;
- strcpy(copy, str);
- return copy;
-}
-
-
-/**
- * Generate new entrypoint
- *
- * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
- * calls \c _glapi_add_dispatch we'll put in the proper offset. If that
- * never happens, and the user calls this function, he'll segfault. That's
- * what you get when you try calling a GL function that doesn't really exist.
- *
- * \param funcName Name of the function to create an entry-point for.
- *
- * \sa _glapi_add_entrypoint
- */
-
-static struct _glapi_function *
-add_function_name( const char * funcName )
-{
- struct _glapi_function * entry = NULL;
- _glapi_proc entrypoint = NULL;
- char * name_dup = NULL;
-
- if (NumExtEntryPoints >= MAX_EXTENSION_FUNCS)
- return NULL;
-
- if (funcName == NULL)
- return NULL;
-
- name_dup = str_dup(funcName);
- if (name_dup == NULL)
- return NULL;
-
- entrypoint = generate_entrypoint(~0);
-
- if (entrypoint == NULL) {
- free(name_dup);
- return NULL;
- }
-
- entry = & ExtEntryTable[NumExtEntryPoints];
- NumExtEntryPoints++;
-
- entry->name = name_dup;
- entry->parameter_signature = NULL;
- entry->dispatch_offset = ~0;
- entry->dispatch_stub = entrypoint;
-
- return entry;
-}
-
-
-static struct _glapi_function *
-set_entry_info( struct _glapi_function * entry, const char * signature, unsigned offset )
-{
- char * sig_dup = NULL;
-
- if (signature == NULL)
- return NULL;
-
- sig_dup = str_dup(signature);
- if (sig_dup == NULL)
- return NULL;
-
- fill_in_entrypoint_offset(entry->dispatch_stub, offset);
-
- entry->parameter_signature = sig_dup;
- entry->dispatch_offset = offset;
-
- return entry;
-}
-
-
-/**
- * Fill-in the dispatch stub for the named function.
- *
- * This function is intended to be called by a hardware driver. When called,
- * a dispatch stub may be created created for the function. A pointer to this
- * dispatch function will be returned by glXGetProcAddress.
- *
- * \param function_names Array of pointers to function names that should
- * share a common dispatch offset.
- * \param parameter_signature String representing the types of the parameters
- * passed to the named function. Parameter types
- * are converted to characters using the following
- * rules:
- * - 'i' for \c GLint, \c GLuint, and \c GLenum
- * - 'p' for any pointer type
- * - 'f' for \c GLfloat and \c GLclampf
- * - 'd' for \c GLdouble and \c GLclampd
- *
- * \returns
- * The offset in the dispatch table of the named function. A pointer to the
- * driver's implementation of the named function should be stored at
- * \c dispatch_table[\c offset]. Return -1 if error/problem.
- *
- * \sa glXGetProcAddress
- *
- * \warning
- * This function can only handle up to 8 names at a time. As far as I know,
- * the maximum number of names ever associated with an existing GL function is
- * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
- * \c glPointParameterfARB, and \c glPointParameterf), so this should not be
- * too painful of a limitation.
- *
- * \todo
- * Determine whether or not \c parameter_signature should be allowed to be
- * \c NULL. It doesn't seem like much of a hardship for drivers to have to
- * pass in an empty string.
- *
- * \todo
- * Determine if code should be added to reject function names that start with
- * 'glX'.
- *
- * \bug
- * Add code to compare \c parameter_signature with the parameter signature of
- * a static function. In order to do that, we need to find a way to \b get
- * the parameter signature of a static function.
- */
-
-int
-_glapi_add_dispatch( const char * const * function_names,
- const char * parameter_signature )
-{
- static int next_dynamic_offset = FIRST_DYNAMIC_OFFSET;
- const char * const real_sig = (parameter_signature != NULL)
- ? parameter_signature : "";
- struct _glapi_function * entry[8];
- GLboolean is_static[8];
- unsigned i;
- int offset = ~0;
-
- init_glapi_relocs_once();
-
- (void) memset( is_static, 0, sizeof( is_static ) );
- (void) memset( entry, 0, sizeof( entry ) );
-
- /* Find the _single_ dispatch offset for all function names that already
- * exist (and have a dispatch offset).
- */
-
- for ( i = 0 ; function_names[i] != NULL ; i++ ) {
- const char * funcName = function_names[i];
- int static_offset;
- int extension_offset;
-
- if (funcName[0] != 'g' || funcName[1] != 'l')
- return -1;
-
- /* search built-in functions */
- static_offset = get_static_proc_offset(funcName);
-
- if (static_offset >= 0) {
-
- is_static[i] = GL_TRUE;
-
- /* FIXME: Make sure the parameter signatures match! How do we get
- * FIXME: the parameter signature for static functions?
- */
-
- if ( (offset != ~0) && (static_offset != offset) ) {
- return -1;
- }
-
- offset = static_offset;
-
- continue;
- }
-
- /* search added extension functions */
- entry[i] = get_extension_proc(funcName);
-
- if (entry[i] != NULL) {
- extension_offset = entry[i]->dispatch_offset;
-
- /* The offset may be ~0 if the function name was added by
- * glXGetProcAddress but never filled in by the driver.
- */
-
- if (extension_offset == ~0) {
- continue;
- }
-
- if (strcmp(real_sig, entry[i]->parameter_signature) != 0) {
- return -1;
- }
-
- if ( (offset != ~0) && (extension_offset != offset) ) {
- return -1;
- }
-
- offset = extension_offset;
- }
- }
-
- /* If all function names are either new (or with no dispatch offset),
- * allocate a new dispatch offset.
- */
-
- if (offset == ~0) {
- offset = next_dynamic_offset;
- next_dynamic_offset++;
- }
-
- /* Fill in the dispatch offset for the new function names (and those with
- * no dispatch offset).
- */
-
- for ( i = 0 ; function_names[i] != NULL ; i++ ) {
- if (is_static[i]) {
- continue;
- }
-
- /* generate entrypoints for new function names */
- if (entry[i] == NULL) {
- entry[i] = add_function_name( function_names[i] );
- if (entry[i] == NULL) {
- /* FIXME: Possible memory leak here. */
- return -1;
- }
- }
-
- if (entry[i]->dispatch_offset == ~0) {
- set_entry_info( entry[i], real_sig, offset );
- }
- }
-
- return offset;
-}
-
-
-/**
- * Return offset of entrypoint for named function within dispatch table.
- */
-GLint
-_glapi_get_proc_offset(const char *funcName)
-{
- GLint offset;
-
- /* search extension functions first */
- offset = get_extension_proc_offset(funcName);
- if (offset >= 0)
- return offset;
-
- /* search static functions */
- return get_static_proc_offset(funcName);
-}
-
-
-
-/**
- * Return pointer to the named function. If the function name isn't found
- * in the name of static functions, try generating a new API entrypoint on
- * the fly with assembly language.
- */
-_glapi_proc
-_glapi_get_proc_address(const char *funcName)
-{
- _glapi_proc func;
- struct _glapi_function * entry;
-
- init_glapi_relocs_once();
-
-#ifdef MANGLE
- /* skip the prefix on the name */
- if (funcName[1] != 'g' || funcName[2] != 'l')
- return NULL;
-#else
- if (funcName[0] != 'g' || funcName[1] != 'l')
- return NULL;
-#endif
-
- /* search extension functions first */
- func = get_extension_proc_address(funcName);
- if (func)
- return func;
-
- /* search static functions */
- func = get_static_proc_address(funcName);
- if (func)
- return func;
-
- /* generate entrypoint, dispatch offset must be filled in by the driver */
- entry = add_function_name(funcName);
- if (entry == NULL)
- return NULL;
-
- return entry->dispatch_stub;
-}
-
-
-
-/**
- * Return the name of the function at the given dispatch offset.
- * This is only intended for debugging.
- */
-const char *
-_glapi_get_proc_name(GLuint offset)
-{
- const char * n;
-
- /* search built-in functions */
- n = get_static_proc_name(offset);
- if ( n != NULL ) {
- return n;
- }
-
- /* search added extension functions */
- return get_extension_proc_name(offset);
-}
-
-
-
-/**********************************************************************
- * GL API table functions.
- */
-
-
-/**
- * Return size of dispatch table struct as number of functions (or
- * slots).
- */
-GLuint
-_glapi_get_dispatch_table_size(void)
-{
- /*
- * The dispatch table size (number of entries) is the size of the
- * _glapi_table struct plus the number of dynamic entries we can add.
- * The extra slots can be filled in by DRI drivers that register new
- * extension functions.
- */
- return FIRST_DYNAMIC_OFFSET + MAX_EXTENSION_FUNCS;
-}
-
-
-/**
- * Make sure there are no NULL pointers in the given dispatch table.
- * Intended for debugging purposes.
- */
-void
-_glapi_check_table_not_null(const struct _glapi_table *table)
-{
-#ifdef EXTRA_DEBUG /* set to DEBUG for extra DEBUG */
- const GLuint entries = _glapi_get_dispatch_table_size();
- const void **tab = (const void **) table;
- GLuint i;
- for (i = 1; i < entries; i++) {
- assert(tab[i]);
- }
-#else
- (void) table;
-#endif
-}
-
-
-/**
- * Do some spot checks to be sure that the dispatch table
- * slots are assigned correctly. For debugging only.
- */
-void
-_glapi_check_table(const struct _glapi_table *table)
-{
-#ifdef EXTRA_DEBUG /* set to DEBUG for extra DEBUG */
- {
- GLuint BeginOffset = _glapi_get_proc_offset("glBegin");
- char *BeginFunc = (char*) &table->Begin;
- GLuint offset = (BeginFunc - (char *) table) / sizeof(void *);
- assert(BeginOffset == offset);
- }
- {
- GLuint viewportOffset = _glapi_get_proc_offset("glViewport");
- char *viewportFunc = (char*) &table->Viewport;
- GLuint offset = (viewportFunc - (char *) table) / sizeof(void *);
- assert(viewportOffset == offset);
- }
- {
- GLuint VertexPointerOffset = _glapi_get_proc_offset("glVertexPointer");
- char *VertexPointerFunc = (char*) &table->VertexPointer;
- GLuint offset = (VertexPointerFunc - (char *) table) / sizeof(void *);
- assert(VertexPointerOffset == offset);
- }
- {
- GLuint ResetMinMaxOffset = _glapi_get_proc_offset("glResetMinmax");
- char *ResetMinMaxFunc = (char*) &table->ResetMinmax;
- GLuint offset = (ResetMinMaxFunc - (char *) table) / sizeof(void *);
- assert(ResetMinMaxOffset == offset);
- }
- {
- GLuint blendColorOffset = _glapi_get_proc_offset("glBlendColor");
- char *blendColorFunc = (char*) &table->BlendColor;
- GLuint offset = (blendColorFunc - (char *) table) / sizeof(void *);
- assert(blendColorOffset == offset);
- }
- {
- GLuint secondaryColor3fOffset = _glapi_get_proc_offset("glSecondaryColor3fEXT");
- char *secondaryColor3fFunc = (char*) &table->SecondaryColor3fEXT;
- GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *);
- assert(secondaryColor3fOffset == offset);
- }
- {
- GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV");
- char *pointParameterivFunc = (char*) &table->PointParameterivNV;
- GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *);
- assert(pointParameterivOffset == offset);
- }
- {
- GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV");
- char *setFenceFunc = (char*) &table->SetFenceNV;
- GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *);
- assert(setFenceOffset == offset);
- }
-#else
- (void) table;
-#endif
-}
+/* + * Mesa 3-D graphics library + * Version: 7.1 + * + * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +/** + * \file glapi_getproc.c + * + * Code for implementing glXGetProcAddress(), etc. + * This was originally in glapi.c but refactored out. + */ + + +#include "glapi/glapi_priv.h" +#include "glapi/glapitable.h" + + +#define FIRST_DYNAMIC_OFFSET (sizeof(struct _glapi_table) / sizeof(void *)) + + +/********************************************************************** + * Static function management. + */ + + +#if !defined(DISPATCH_FUNCTION_SIZE) +# define NEED_FUNCTION_POINTER +#endif +#include "glapi/glprocs.h" + + +/** + * Search the table of static entrypoint functions for the named function + * and return the corresponding glprocs_table_t entry. + */ +static const glprocs_table_t * +get_static_proc( const char * n ) +{ + GLuint i; + for (i = 0; static_functions[i].Name_offset >= 0; i++) { + const char *testName = gl_string_table + static_functions[i].Name_offset; +#ifdef MANGLE + /* skip the prefix on the name */ + if (strcmp(testName, n + 1) == 0) +#else + if (strcmp(testName, n) == 0) +#endif + { + return &static_functions[i]; + } + } + return NULL; +} + + +/** + * Return dispatch table offset of the named static (built-in) function. + * Return -1 if function not found. + */ +static GLint +get_static_proc_offset(const char *funcName) +{ + const glprocs_table_t * const f = get_static_proc( funcName ); + if (f == NULL) { + return -1; + } + + return f->Offset; +} + + + +/** + * Return dispatch function address for the named static (built-in) function. + * Return NULL if function not found. + */ +static _glapi_proc +get_static_proc_address(const char *funcName) +{ + const glprocs_table_t * const f = get_static_proc( funcName ); + if (f == NULL) { + return NULL; + } + +#if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING) + return (f->Address == NULL) + ? get_entrypoint_address(f->Offset) + : f->Address; +#elif defined(DISPATCH_FUNCTION_SIZE) + return get_entrypoint_address(f->Offset); +#else + return f->Address; +#endif +} + + + +/** + * Return the name of the function at the given offset in the dispatch + * table. For debugging only. + */ +static const char * +get_static_proc_name( GLuint offset ) +{ + GLuint i; + for (i = 0; static_functions[i].Name_offset >= 0; i++) { + if (static_functions[i].Offset == offset) { + return gl_string_table + static_functions[i].Name_offset; + } + } + return NULL; +} + + + +/********************************************************************** + * Extension function management. + */ + + +/** + * Track information about a function added to the GL API. + */ +struct _glapi_function { + /** + * Name of the function. + */ + const char * name; + + + /** + * Text string that describes the types of the parameters passed to the + * named function. Parameter types are converted to characters using the + * following rules: + * - 'i' for \c GLint, \c GLuint, and \c GLenum + * - 'p' for any pointer type + * - 'f' for \c GLfloat and \c GLclampf + * - 'd' for \c GLdouble and \c GLclampd + */ + const char * parameter_signature; + + + /** + * Offset in the dispatch table where the pointer to the real function is + * located. If the driver has not requested that the named function be + * added to the dispatch table, this will have the value ~0. + */ + unsigned dispatch_offset; + + + /** + * Pointer to the dispatch stub for the named function. + * + * \todo + * The semantic of this field should be changed slightly. Currently, it + * is always expected to be non-\c NULL. However, it would be better to + * only allocate the entry-point stub when the application requests the + * function via \c glXGetProcAddress. This would save memory for all the + * functions that the driver exports but that the application never wants + * to call. + */ + _glapi_proc dispatch_stub; +}; + + +static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS]; +static GLuint NumExtEntryPoints = 0; + + +static struct _glapi_function * +get_extension_proc(const char *funcName) +{ + GLuint i; + for (i = 0; i < NumExtEntryPoints; i++) { + if (strcmp(ExtEntryTable[i].name, funcName) == 0) { + return & ExtEntryTable[i]; + } + } + return NULL; +} + + +static GLint +get_extension_proc_offset(const char *funcName) +{ + const struct _glapi_function * const f = get_extension_proc( funcName ); + if (f == NULL) { + return -1; + } + + return f->dispatch_offset; +} + + +static _glapi_proc +get_extension_proc_address(const char *funcName) +{ + const struct _glapi_function * const f = get_extension_proc( funcName ); + if (f == NULL) { + return NULL; + } + + return f->dispatch_stub; +} + + +static const char * +get_extension_proc_name(GLuint offset) +{ + GLuint i; + for (i = 0; i < NumExtEntryPoints; i++) { + if (ExtEntryTable[i].dispatch_offset == offset) { + return ExtEntryTable[i].name; + } + } + return NULL; +} + + +/** + * strdup() is actually not a standard ANSI C or POSIX routine. + * Irix will not define it if ANSI mode is in effect. + */ +static char * +str_dup(const char *str) +{ + char *copy; + copy = (char*) malloc(strlen(str) + 1); + if (!copy) + return NULL; + strcpy(copy, str); + return copy; +} + + +/** + * Generate new entrypoint + * + * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver + * calls \c _glapi_add_dispatch we'll put in the proper offset. If that + * never happens, and the user calls this function, he'll segfault. That's + * what you get when you try calling a GL function that doesn't really exist. + * + * \param funcName Name of the function to create an entry-point for. + * + * \sa _glapi_add_entrypoint + */ + +static struct _glapi_function * +add_function_name( const char * funcName ) +{ + struct _glapi_function * entry = NULL; + _glapi_proc entrypoint = NULL; + char * name_dup = NULL; + + if (NumExtEntryPoints >= MAX_EXTENSION_FUNCS) + return NULL; + + if (funcName == NULL) + return NULL; + + name_dup = str_dup(funcName); + if (name_dup == NULL) + return NULL; + + entrypoint = generate_entrypoint(~0); + + if (entrypoint == NULL) { + free(name_dup); + return NULL; + } + + entry = & ExtEntryTable[NumExtEntryPoints]; + NumExtEntryPoints++; + + entry->name = name_dup; + entry->parameter_signature = NULL; + entry->dispatch_offset = ~0; + entry->dispatch_stub = entrypoint; + + return entry; +} + + +static struct _glapi_function * +set_entry_info( struct _glapi_function * entry, const char * signature, unsigned offset ) +{ + char * sig_dup = NULL; + + if (signature == NULL) + return NULL; + + sig_dup = str_dup(signature); + if (sig_dup == NULL) + return NULL; + + fill_in_entrypoint_offset(entry->dispatch_stub, offset); + + entry->parameter_signature = sig_dup; + entry->dispatch_offset = offset; + + return entry; +} + + +/** + * Fill-in the dispatch stub for the named function. + * + * This function is intended to be called by a hardware driver. When called, + * a dispatch stub may be created created for the function. A pointer to this + * dispatch function will be returned by glXGetProcAddress. + * + * \param function_names Array of pointers to function names that should + * share a common dispatch offset. + * \param parameter_signature String representing the types of the parameters + * passed to the named function. Parameter types + * are converted to characters using the following + * rules: + * - 'i' for \c GLint, \c GLuint, and \c GLenum + * - 'p' for any pointer type + * - 'f' for \c GLfloat and \c GLclampf + * - 'd' for \c GLdouble and \c GLclampd + * + * \returns + * The offset in the dispatch table of the named function. A pointer to the + * driver's implementation of the named function should be stored at + * \c dispatch_table[\c offset]. Return -1 if error/problem. + * + * \sa glXGetProcAddress + * + * \warning + * This function can only handle up to 8 names at a time. As far as I know, + * the maximum number of names ever associated with an existing GL function is + * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT, + * \c glPointParameterfARB, and \c glPointParameterf), so this should not be + * too painful of a limitation. + * + * \todo + * Determine whether or not \c parameter_signature should be allowed to be + * \c NULL. It doesn't seem like much of a hardship for drivers to have to + * pass in an empty string. + * + * \todo + * Determine if code should be added to reject function names that start with + * 'glX'. + * + * \bug + * Add code to compare \c parameter_signature with the parameter signature of + * a static function. In order to do that, we need to find a way to \b get + * the parameter signature of a static function. + */ + +int +_glapi_add_dispatch( const char * const * function_names, + const char * parameter_signature ) +{ + static int next_dynamic_offset = FIRST_DYNAMIC_OFFSET; + const char * const real_sig = (parameter_signature != NULL) + ? parameter_signature : ""; + struct _glapi_function * entry[8]; + GLboolean is_static[8]; + unsigned i; + int offset = ~0; + + init_glapi_relocs_once(); + + (void) memset( is_static, 0, sizeof( is_static ) ); + (void) memset( entry, 0, sizeof( entry ) ); + + /* Find the _single_ dispatch offset for all function names that already + * exist (and have a dispatch offset). + */ + + for ( i = 0 ; function_names[i] != NULL ; i++ ) { + const char * funcName = function_names[i]; + int static_offset; + int extension_offset; + + if (funcName[0] != 'g' || funcName[1] != 'l') + return -1; + + /* search built-in functions */ + static_offset = get_static_proc_offset(funcName); + + if (static_offset >= 0) { + + is_static[i] = GL_TRUE; + + /* FIXME: Make sure the parameter signatures match! How do we get + * FIXME: the parameter signature for static functions? + */ + + if ( (offset != ~0) && (static_offset != offset) ) { + return -1; + } + + offset = static_offset; + + continue; + } + + /* search added extension functions */ + entry[i] = get_extension_proc(funcName); + + if (entry[i] != NULL) { + extension_offset = entry[i]->dispatch_offset; + + /* The offset may be ~0 if the function name was added by + * glXGetProcAddress but never filled in by the driver. + */ + + if (extension_offset == ~0) { + continue; + } + + if (strcmp(real_sig, entry[i]->parameter_signature) != 0) { + return -1; + } + + if ( (offset != ~0) && (extension_offset != offset) ) { + return -1; + } + + offset = extension_offset; + } + } + + /* If all function names are either new (or with no dispatch offset), + * allocate a new dispatch offset. + */ + + if (offset == ~0) { + offset = next_dynamic_offset; + next_dynamic_offset++; + } + + /* Fill in the dispatch offset for the new function names (and those with + * no dispatch offset). + */ + + for ( i = 0 ; function_names[i] != NULL ; i++ ) { + if (is_static[i]) { + continue; + } + + /* generate entrypoints for new function names */ + if (entry[i] == NULL) { + entry[i] = add_function_name( function_names[i] ); + if (entry[i] == NULL) { + /* FIXME: Possible memory leak here. */ + return -1; + } + } + + if (entry[i]->dispatch_offset == ~0) { + set_entry_info( entry[i], real_sig, offset ); + } + } + + return offset; +} + + +/** + * Return offset of entrypoint for named function within dispatch table. + */ +GLint +_glapi_get_proc_offset(const char *funcName) +{ + GLint offset; + + /* search extension functions first */ + offset = get_extension_proc_offset(funcName); + if (offset >= 0) + return offset; + + /* search static functions */ + return get_static_proc_offset(funcName); +} + + + +/** + * Return pointer to the named function. If the function name isn't found + * in the name of static functions, try generating a new API entrypoint on + * the fly with assembly language. + */ +_glapi_proc +_glapi_get_proc_address(const char *funcName) +{ + _glapi_proc func; + struct _glapi_function * entry; + + init_glapi_relocs_once(); + +#ifdef MANGLE + /* skip the prefix on the name */ + if (funcName[1] != 'g' || funcName[2] != 'l') + return NULL; +#else + if (funcName[0] != 'g' || funcName[1] != 'l') + return NULL; +#endif + + /* search extension functions first */ + func = get_extension_proc_address(funcName); + if (func) + return func; + + /* search static functions */ + func = get_static_proc_address(funcName); + if (func) + return func; + + /* generate entrypoint, dispatch offset must be filled in by the driver */ + entry = add_function_name(funcName); + if (entry == NULL) + return NULL; + + return entry->dispatch_stub; +} + + + +/** + * Return the name of the function at the given dispatch offset. + * This is only intended for debugging. + */ +const char * +_glapi_get_proc_name(GLuint offset) +{ + const char * n; + + /* search built-in functions */ + n = get_static_proc_name(offset); + if ( n != NULL ) { + return n; + } + + /* search added extension functions */ + return get_extension_proc_name(offset); +} + + + +/********************************************************************** + * GL API table functions. + */ + + +/** + * Return size of dispatch table struct as number of functions (or + * slots). + */ +GLuint +_glapi_get_dispatch_table_size(void) +{ + /* + * The dispatch table size (number of entries) is the size of the + * _glapi_table struct plus the number of dynamic entries we can add. + * The extra slots can be filled in by DRI drivers that register new + * extension functions. + */ + return FIRST_DYNAMIC_OFFSET + MAX_EXTENSION_FUNCS; +} + + +/** + * Make sure there are no NULL pointers in the given dispatch table. + * Intended for debugging purposes. + */ +void +_glapi_check_table_not_null(const struct _glapi_table *table) +{ +#ifdef EXTRA_DEBUG /* set to DEBUG for extra DEBUG */ + const GLuint entries = _glapi_get_dispatch_table_size(); + const void **tab = (const void **) table; + GLuint i; + for (i = 1; i < entries; i++) { + assert(tab[i]); + } +#else + (void) table; +#endif +} + + +/** + * Do some spot checks to be sure that the dispatch table + * slots are assigned correctly. For debugging only. + */ +void +_glapi_check_table(const struct _glapi_table *table) +{ +#ifdef EXTRA_DEBUG /* set to DEBUG for extra DEBUG */ + { + GLuint BeginOffset = _glapi_get_proc_offset("glBegin"); + char *BeginFunc = (char*) &table->Begin; + GLuint offset = (BeginFunc - (char *) table) / sizeof(void *); + assert(BeginOffset == offset); + } + { + GLuint viewportOffset = _glapi_get_proc_offset("glViewport"); + char *viewportFunc = (char*) &table->Viewport; + GLuint offset = (viewportFunc - (char *) table) / sizeof(void *); + assert(viewportOffset == offset); + } + { + GLuint VertexPointerOffset = _glapi_get_proc_offset("glVertexPointer"); + char *VertexPointerFunc = (char*) &table->VertexPointer; + GLuint offset = (VertexPointerFunc - (char *) table) / sizeof(void *); + assert(VertexPointerOffset == offset); + } + { + GLuint ResetMinMaxOffset = _glapi_get_proc_offset("glResetMinmax"); + char *ResetMinMaxFunc = (char*) &table->ResetMinmax; + GLuint offset = (ResetMinMaxFunc - (char *) table) / sizeof(void *); + assert(ResetMinMaxOffset == offset); + } + { + GLuint blendColorOffset = _glapi_get_proc_offset("glBlendColor"); + char *blendColorFunc = (char*) &table->BlendColor; + GLuint offset = (blendColorFunc - (char *) table) / sizeof(void *); + assert(blendColorOffset == offset); + } + { + GLuint secondaryColor3fOffset = _glapi_get_proc_offset("glSecondaryColor3fEXT"); + char *secondaryColor3fFunc = (char*) &table->SecondaryColor3fEXT; + GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *); + assert(secondaryColor3fOffset == offset); + } + { + GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV"); + char *pointParameterivFunc = (char*) &table->PointParameterivNV; + GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *); + assert(pointParameterivOffset == offset); + } + { + GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV"); + char *setFenceFunc = (char*) &table->SetFenceNV; + GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *); + assert(setFenceOffset == offset); + } +#else + (void) table; +#endif +} |