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-rw-r--r--mesalib/src/mapi/glapi/glapi_getproc.c1352
1 files changed, 666 insertions, 686 deletions
diff --git a/mesalib/src/mapi/glapi/glapi_getproc.c b/mesalib/src/mapi/glapi/glapi_getproc.c
index dc4905b64..21380ea41 100644
--- a/mesalib/src/mapi/glapi/glapi_getproc.c
+++ b/mesalib/src/mapi/glapi/glapi_getproc.c
@@ -1,686 +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"
-#include "glapi/glapioffsets.h"
-
-
-/**********************************************************************
- * Static function management.
- */
-
-
-#if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server)
-# 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;
-}
-
-
-#if !defined(XFree86Server)
-
-/**
- * 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
-}
-
-#else
-
-static _glapi_proc
-get_static_proc_address(const char *funcName)
-{
- (void) funcName;
- return NULL;
-}
-
-#endif /* !defined(XFree86Server) */
-
-
-/**
- * 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 = _gloffset_FIRST_DYNAMIC;
- 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.
- */
-
-
-/*
- * 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.
- */
-#define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
-
-
-/**
- * Return size of dispatch table struct as number of functions (or
- * slots).
- */
-GLuint
-_glapi_get_dispatch_table_size(void)
-{
- return DISPATCH_TABLE_SIZE;
-}
-
-
-/**
- * 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 == _gloffset_Begin);
- assert(BeginOffset == offset);
- }
- {
- GLuint viewportOffset = _glapi_get_proc_offset("glViewport");
- char *viewportFunc = (char*) &table->Viewport;
- GLuint offset = (viewportFunc - (char *) table) / sizeof(void *);
- assert(viewportOffset == _gloffset_Viewport);
- assert(viewportOffset == offset);
- }
- {
- GLuint VertexPointerOffset = _glapi_get_proc_offset("glVertexPointer");
- char *VertexPointerFunc = (char*) &table->VertexPointer;
- GLuint offset = (VertexPointerFunc - (char *) table) / sizeof(void *);
- assert(VertexPointerOffset == _gloffset_VertexPointer);
- assert(VertexPointerOffset == offset);
- }
- {
- GLuint ResetMinMaxOffset = _glapi_get_proc_offset("glResetMinmax");
- char *ResetMinMaxFunc = (char*) &table->ResetMinmax;
- GLuint offset = (ResetMinMaxFunc - (char *) table) / sizeof(void *);
- assert(ResetMinMaxOffset == _gloffset_ResetMinmax);
- assert(ResetMinMaxOffset == offset);
- }
- {
- GLuint blendColorOffset = _glapi_get_proc_offset("glBlendColor");
- char *blendColorFunc = (char*) &table->BlendColor;
- GLuint offset = (blendColorFunc - (char *) table) / sizeof(void *);
- assert(blendColorOffset == _gloffset_BlendColor);
- assert(blendColorOffset == offset);
- }
- {
- GLuint secondaryColor3fOffset = _glapi_get_proc_offset("glSecondaryColor3fEXT");
- char *secondaryColor3fFunc = (char*) &table->SecondaryColor3fEXT;
- GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *);
- assert(secondaryColor3fOffset == _gloffset_SecondaryColor3fEXT);
- assert(secondaryColor3fOffset == offset);
- }
- {
- GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV");
- char *pointParameterivFunc = (char*) &table->PointParameterivNV;
- GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *);
- assert(pointParameterivOffset == _gloffset_PointParameterivNV);
- assert(pointParameterivOffset == offset);
- }
- {
- GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV");
- char *setFenceFunc = (char*) &table->SetFenceNV;
- GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *);
- assert(setFenceOffset == _gloffset_SetFenceNV);
- 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
+}
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