xserver and mesa git update 28-12-2010

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

+}