xserver mesa git update 30 Mar 2011

1 files changed, 512 insertions, 876 deletions

diff --git a/xorg-server/glx/glapi.c b/xorg-server/glx/glapi.c
index 19576a775..d5275dc81 100644
--- a/xorg-server/glx/glapi.c
+++ b/xorg-server/glx/glapi.c
@@ -1,876 +1,512 @@
-/*
- * Mesa 3-D graphics library
- * Version:  6.5
- *
- * Copyright (C) 1999-2006  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.
- */
-
-
-/*
- * This file manages the OpenGL API dispatch layer.
- * The dispatch table (struct _glapi_table) is basically just a list
- * of function pointers.
- * There are functions to set/get the current dispatch table for the
- * current thread and to manage registration/dispatch of dynamically
- * added extension functions.
- *
- * It's intended that this file and the other glapi*.[ch] files are
- * flexible enough to be reused in several places:  XFree86, DRI-
- * based libGL.so, and perhaps the SGI SI.
- *
- * NOTE: There are no dependencies on Mesa in this code.
- *
- * Versions (API changes):
- *   2000/02/23  - original version for Mesa 3.3 and XFree86 4.0
- *   2001/01/16  - added dispatch override feature for Mesa 3.5
- *   2002/06/28  - added _glapi_set_warning_func(), Mesa 4.1.
- *   2002/10/01  - _glapi_get_proc_address() will now generate new entrypoints
- *                 itself (using offset ~0).  _glapi_add_entrypoint() can be
- *                 called afterward and it'll fill in the correct dispatch
- *                 offset.  This allows DRI libGL to avoid probing for DRI
- *                 drivers!  No changes to the public glapi interface.
- */
-
-
-
-#ifdef HAVE_DIX_CONFIG_H
-
-#include <dix-config.h>
-#include <X11/Xfuncproto.h>
-#define PUBLIC _X_EXPORT
-
-#else
-
-#include "glheader.h"
-
-#endif
-
-#include <stdlib.h>
-#include <string.h>
-#ifdef DEBUG
-#include <assert.h>
-#endif
-
-#include "glapi.h"
-#include "glapioffsets.h"
-#include "glapitable.h"
-
-/***** BEGIN NO-OP DISPATCH *****/
-
-static GLboolean WarnFlag = GL_FALSE;
-static _glapi_warning_func warning_func;
-
-#if defined(PTHREADS) || defined(GLX_USE_TLS)
-static void init_glapi_relocs(void);
-#endif
-
-static _glapi_proc generate_entrypoint(GLuint functionOffset);
-static void fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset);
-
-/*
- * Enable/disable printing of warning messages.
- */
-PUBLIC void
-_glapi_noop_enable_warnings(GLboolean enable)
-{
-   WarnFlag = enable;
-}
-
-/*
- * Register a callback function for reporting errors.
- */
-PUBLIC void
-_glapi_set_warning_func( _glapi_warning_func func )
-{
-   warning_func = func;
-}
-
-static GLboolean
-warn(void)
-{
-   if ((WarnFlag || getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG"))
-       && warning_func) {
-      return GL_TRUE;
-   }
-   else {
-      return GL_FALSE;
-   }
-}
-
-#if defined(__GNUC__) && (__GNUC__ > 2)
-#define possibly_unused __attribute((unused))
-#else
-#define possibly_unused
-#endif
-
-#define KEYWORD1 static
-#define KEYWORD1_ALT static
-#define KEYWORD2 GLAPIENTRY possibly_unused
-#define NAME(func)  NoOp##func
-
-#define F NULL
-
-#define DISPATCH(func, args, msg)					      \
-   if (warn()) {							      \
-      warning_func(NULL, "GL User Error: called without context: %s", #func); \
-   }
-
-#define RETURN_DISPATCH(func, args, msg)				      \
-   if (warn()) {							      \
-      warning_func(NULL, "GL User Error: called without context: %s", #func); \
-   }									      \
-   return 0
-
-#define DISPATCH_TABLE_NAME __glapi_noop_table
-#define UNUSED_TABLE_NAME __unused_noop_functions
-
-#define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
-
-static GLint NoOpUnused(void)
-{
-   if (warn()) {
-      warning_func(NULL, "GL User Error: calling extension function without a current context\n");
-   }
-   return 0;
-}
-
-#include "glapitemp.h"
-
-/***** END NO-OP DISPATCH *****/
-
-
-
-/**
- * \name Current dispatch and current context control variables
- *
- * Depending on whether or not multithreading is support, and the type of
- * support available, several variables are used to store the current context
- * pointer and the current dispatch table pointer.  In the non-threaded case,
- * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this
- * purpose.
- *
- * In the "normal" threaded case, the variables \c _glapi_Dispatch and
- * \c _glapi_Context will be \c NULL if an application is detected as being
- * multithreaded.  Single-threaded applications will use \c _glapi_Dispatch
- * and \c _glapi_Context just like the case without any threading support.
- * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state
- * data \c _gl_DispatchTSD and \c ContextTSD are used.  Drivers and the
- * static dispatch functions access these variables via \c _glapi_get_dispatch
- * and \c _glapi_get_context.
- *
- * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are
- * hardcoded to \c NULL.  Instead the TLS variables \c _glapi_tls_Dispatch and
- * \c _glapi_tls_Context are used.  Having \c _glapi_Dispatch and
- * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability
- * between TLS enabled loaders and non-TLS DRI drivers.
- */
-/*@{*/
-#if defined(GLX_USE_TLS)
-
-PUBLIC TLS struct _glapi_table * _glapi_tls_Dispatch
-    __attribute__((tls_model("initial-exec")))
-    = (struct _glapi_table *) __glapi_noop_table;
-
-PUBLIC TLS void * _glapi_tls_Context
-    __attribute__((tls_model("initial-exec")));
-
-PUBLIC const struct _glapi_table *_glapi_Dispatch = NULL;
-PUBLIC const void *_glapi_Context = NULL;
-
-#else
-
-#if defined(THREADS)
-
-_glthread_TSD _gl_DispatchTSD;           /**< Per-thread dispatch pointer */
-static _glthread_TSD ContextTSD;         /**< Per-thread context pointer */
-
-#if defined(WIN32_THREADS)
-void FreeTSD(_glthread_TSD *p);
-void FreeAllTSD(void)
-{
-   FreeTSD(&_gl_DispatchTSD);
-   FreeTSD(&ContextTSD);
-}
-#endif /* defined(WIN32_THREADS) */
-
-#endif /* defined(THREADS) */
-
-PUBLIC struct _glapi_table *_glapi_Dispatch = 
-  (struct _glapi_table *) __glapi_noop_table;
-PUBLIC void *_glapi_Context = NULL;
-
-#endif /* defined(GLX_USE_TLS) */
-/*@}*/
-
-
-/**
- * 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;
-}
-
-
-/*
- * xserver's gl is not multithreaded, we promise.
- */
-PUBLIC void
-_glapi_check_multithread(void)
-{
-}
-
-/**
- * Set the current context pointer for this thread.
- * The context pointer is an opaque type which should be cast to
- * void from the real context pointer type.
- */
-PUBLIC void
-_glapi_set_context(void *context)
-{
-   (void) __unused_noop_functions; /* silence a warning */
-#if defined(GLX_USE_TLS)
-   _glapi_tls_Context = context;
-#elif defined(THREADS)
-   _glthread_SetTSD(&ContextTSD, context);
-   _glapi_Context = context;
-#else
-   _glapi_Context = context;
-#endif
-}
-
-
-
-/**
- * Get the current context pointer for this thread.
- * The context pointer is an opaque type which should be cast from
- * void to the real context pointer type.
- */
-PUBLIC void *
-_glapi_get_context(void)
-{
-#if defined(GLX_USE_TLS)
-   return _glapi_tls_Context;
-#else
-   return _glapi_Context;
-#endif
-}
-
-
-
-/**
- * Set the global or per-thread dispatch table pointer.
- * If the dispatch parameter is NULL we'll plug in the no-op dispatch
- * table (__glapi_noop_table).
- */
-PUBLIC void
-_glapi_set_dispatch(struct _glapi_table *dispatch)
-{
-#if defined(PTHREADS) || defined(GLX_USE_TLS)
-   static pthread_once_t once_control = PTHREAD_ONCE_INIT;
-   pthread_once( & once_control, init_glapi_relocs );
-#endif
-
-   if (!dispatch) {
-      /* use the no-op functions */
-      dispatch = (struct _glapi_table *) __glapi_noop_table;
-   }
-
-#if defined(GLX_USE_TLS)
-   _glapi_tls_Dispatch = dispatch;
-#elif defined(THREADS)
-   _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
-   _glapi_Dispatch = dispatch;
-#else /*THREADS*/
-   _glapi_Dispatch = dispatch;
-#endif /*THREADS*/
-}
-
-
-
-/**
- * Return pointer to current dispatch table for calling thread.
- */
-PUBLIC struct _glapi_table *
-_glapi_get_dispatch(void)
-{
-   struct _glapi_table * api;
-#if defined(GLX_USE_TLS)
-   api = _glapi_tls_Dispatch;
-#else
-   api = _glapi_Dispatch;
-#endif
-   return api;
-}
-
-
-
-/***
- *** The rest of this file is pretty much concerned with GetProcAddress
- *** functionality.
- ***/
-
-#if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)
-# define DISPATCH_FUNCTION_SIZE  16
-#elif defined(USE_X86_ASM)
-# if defined(THREADS) && !defined(GLX_USE_TLS)
-#  define DISPATCH_FUNCTION_SIZE  32
-# else
-#  define DISPATCH_FUNCTION_SIZE  16
-# endif
-#endif
-
-#if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer)
-# define NEED_FUNCTION_POINTER
-#endif
-
-/* The code in this file is auto-generated with Python */
-#include "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 *
-find_entry( 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;
-      if (strcmp(testName, n) == 0) {
-	 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 = find_entry( funcName );
-   if (f) {
-      return f->Offset;
-   }
-   return -1;
-}
-
-
-#if !defined(XFree86Server) && !defined(XGLServer)
-#ifdef USE_X86_ASM
-
-#if defined( GLX_USE_TLS )
-extern       GLubyte gl_dispatch_functions_start[];
-extern       GLubyte gl_dispatch_functions_end[];
-#else
-extern const GLubyte gl_dispatch_functions_start[];
-#endif
-
-#endif /* USE_X86_ASM */
-
-
-/**
- * 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 = find_entry( funcName );
-   if (f) {
-#if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING)
-      return (f->Address == NULL)
-	 ? (_glapi_proc) (gl_dispatch_functions_start
-			  + (DISPATCH_FUNCTION_SIZE * f->Offset))
-         : f->Address;
-#elif defined(DISPATCH_FUNCTION_SIZE)
-      return (_glapi_proc) (gl_dispatch_functions_start 
-                            + (DISPATCH_FUNCTION_SIZE * f->Offset));
-#else
-      return f->Address;
-#endif
-   }
-   else {
-      return NULL;
-   }
-}
-
-#endif /* !defined(XFree86Server) && !defined(XGLServer) */
-
-/**********************************************************************
- * Extension function management.
- */
-
-/*
- * Number of extension functions which we can dynamically add at runtime.
- */
-#define MAX_EXTENSION_FUNCS 300
-
-
-/*
- * 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)
-
-
-/**
- * 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;
-
-#ifdef USE_SPARC_ASM
-extern void __glapi_sparc_icache_flush(unsigned int *);
-#endif
-
-/**
- * Generate a dispatch function (entrypoint) which jumps through
- * the given slot number (offset) in the current dispatch table.
- * We need assembly language in order to accomplish this.
- */
-static _glapi_proc
-generate_entrypoint(GLuint functionOffset)
-{
-#if defined(USE_X86_ASM)
-   /* 32 is chosen as something of a magic offset.  For x86, the dispatch
-    * at offset 32 is the first one where the offset in the
-    * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
-    */
-   const GLubyte * const template_func = gl_dispatch_functions_start 
-     + (DISPATCH_FUNCTION_SIZE * 32);
-   GLubyte * const code = (GLubyte *) malloc(DISPATCH_FUNCTION_SIZE);
-
-
-   if ( code != NULL ) {
-      (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE);
-      fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset );
-   }
-
-   return (_glapi_proc) code;
-#elif defined(USE_SPARC_ASM)
-
-#ifdef __arch64__
-   static const unsigned int insn_template[] = {
-	   0x05000000,	/* sethi	%uhi(_glapi_Dispatch), %g2	*/
-	   0x03000000,	/* sethi	%hi(_glapi_Dispatch), %g1	*/
-	   0x8410a000,	/* or		%g2, %ulo(_glapi_Dispatch), %g2	*/
-	   0x82106000,	/* or		%g1, %lo(_glapi_Dispatch), %g1	*/
-	   0x8528b020,	/* sllx		%g2, 32, %g2			*/
-	   0xc2584002,	/* ldx		[%g1 + %g2], %g1		*/
-	   0x05000000,	/* sethi	%hi(8 * glapioffset), %g2	*/
-	   0x8410a000,	/* or		%g2, %lo(8 * glapioffset), %g2	*/
-	   0xc6584002,	/* ldx		[%g1 + %g2], %g3		*/
-	   0x81c0c000,	/* jmpl		%g3, %g0			*/
-	   0x01000000	/*  nop						*/
-   };
-#else
-   static const unsigned int insn_template[] = {
-	   0x03000000,	/* sethi	%hi(_glapi_Dispatch), %g1	  */
-	   0xc2006000,	/* ld		[%g1 + %lo(_glapi_Dispatch)], %g1 */
-	   0xc6006000,	/* ld		[%g1 + %lo(4*glapioffset)], %g3	  */
-	   0x81c0c000,	/* jmpl		%g3, %g0			  */
-	   0x01000000	/*  nop						  */
-   };
-#endif /* __arch64__ */
-   unsigned int *code = (unsigned int *) malloc(sizeof(insn_template));
-   unsigned long glapi_addr = (unsigned long) &_glapi_Dispatch;
-   if (code) {
-      memcpy(code, insn_template, sizeof(insn_template));
-
-#ifdef __arch64__
-      code[0] |= (glapi_addr >> (32 + 10));
-      code[1] |= ((glapi_addr & 0xffffffff) >> 10);
-      __glapi_sparc_icache_flush(&code[0]);
-      code[2] |= ((glapi_addr >> 32) & ((1 << 10) - 1));
-      code[3] |= (glapi_addr & ((1 << 10) - 1));
-      __glapi_sparc_icache_flush(&code[2]);
-      code[6] |= ((functionOffset * 8) >> 10);
-      code[7] |= ((functionOffset * 8) & ((1 << 10) - 1));
-      __glapi_sparc_icache_flush(&code[6]);
-#else
-      code[0] |= (glapi_addr >> 10);
-      code[1] |= (glapi_addr & ((1 << 10) - 1));
-      __glapi_sparc_icache_flush(&code[0]);
-      code[2] |= (functionOffset * 4);
-      __glapi_sparc_icache_flush(&code[2]);
-#endif /* __arch64__ */
-   }
-   return (_glapi_proc) code;
-#else
-   (void) functionOffset;
-   return NULL;
-#endif /* USE_*_ASM */
-}
-
-
-/**
- * This function inserts a new dispatch offset into the assembly language
- * stub that was generated with the preceeding function.
- */
-static void
-fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
-{
-#if defined(USE_X86_ASM)
-   GLubyte * const code = (GLubyte *) entrypoint;
-
-#if DISPATCH_FUNCTION_SIZE == 32
-   *((unsigned int *)(code + 11)) = 4 * offset;
-   *((unsigned int *)(code + 22)) = 4 * offset;
-#elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS )
-   *((unsigned int *)(code +  8)) = 4 * offset;
-#elif DISPATCH_FUNCTION_SIZE == 16
-   *((unsigned int *)(code +  7)) = 4 * offset;
-#else
-# error Invalid DISPATCH_FUNCTION_SIZE!
-#endif
-
-#elif defined(USE_SPARC_ASM)
-
-   /* XXX this hasn't been tested! */
-   unsigned int *code = (unsigned int *) entrypoint;
-#ifdef __arch64__
-   code[6] = 0x05000000;  /* sethi	%hi(8 * glapioffset), %g2	*/
-   code[7] = 0x8410a000;  /* or		%g2, %lo(8 * glapioffset), %g2	*/
-   code[6] |= ((offset * 8) >> 10);
-   code[7] |= ((offset * 8) & ((1 << 10) - 1));
-   __glapi_sparc_icache_flush(&code[6]);
-#else /* __arch64__ */
-   code[2] = 0xc6006000;  /* ld		[%g1 + %lo(4*glapioffset)], %g3	  */
-   code[2] |= (offset * 4);
-   __glapi_sparc_icache_flush(&code[2]);
-#endif /* __arch64__ */
-
-#else
-
-   /* an unimplemented architecture */
-   (void) entrypoint;
-   (void) offset;
-
-#endif /* USE_*_ASM */
-}
-
-
-/**
- * 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;
-   
-   if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) {
-      _glapi_proc entrypoint = generate_entrypoint(~0);
-      if (entrypoint != NULL) {
-	 entry = & ExtEntryTable[NumExtEntryPoints];
-
-	 ExtEntryTable[NumExtEntryPoints].name = str_dup(funcName);
-	 ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL;
-	 ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0;
-	 ExtEntryTable[NumExtEntryPoints].dispatch_stub = entrypoint;
-	 NumExtEntryPoints++;
-      }
-   }
-
-   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].
- *
- * \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.
- */
-
-PUBLIC 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;
-   unsigned j;
-   int offset = ~0;
-   int new_offset;
-
-
-   (void) memset( is_static, 0, sizeof( is_static ) );
-   (void) memset( entry, 0, sizeof( entry ) );
-
-   for ( i = 0 ; function_names[i] != NULL ; i++ ) {
-      /* Do some trivial validation on the name of the function.
-       */
-
-      if (!function_names[i] || function_names[i][0] != 'g' || function_names[i][1] != 'l')
-	return GL_FALSE;
-   
-      /* Determine if the named function already exists.  If the function does
-       * exist, it must have the same parameter signature as the function
-       * being added.
-       */
-
-      new_offset = get_static_proc_offset(function_names[i]);
-      if (new_offset >= 0) {
-	 /* FIXME: Make sure the parameter signatures match!  How do we get
-	  * FIXME: the parameter signature for static functions?
-	  */
-
-	 if ( (offset != ~0) && (new_offset != offset) ) {
-	    return -1;
-	 }
-
-	 is_static[i] = GL_TRUE;
-	 offset = new_offset;
-      }
-   
-   
-      for ( j = 0 ; j < NumExtEntryPoints ; j++ ) {
-	 if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) {
-	    /* The offset may be ~0 if the function name was added by
-	     * glXGetProcAddress but never filled in by the driver.
-	     */
-
-	    if (ExtEntryTable[j].dispatch_offset != ~0) {
-	       if (strcmp(real_sig, ExtEntryTable[j].parameter_signature) 
-		   != 0) {
-		  return -1;
-	       }
-
-	       if ( (offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset) ) {
-		  return -1;
-	       }
-
-	       offset = ExtEntryTable[j].dispatch_offset;
-	    }
-	    
-	    entry[i] = & ExtEntryTable[j];
-	    break;
-	 }
-      }
-   }
-
-   if (offset == ~0) {
-      offset = next_dynamic_offset;
-      next_dynamic_offset++;
-   }
-
-   for ( i = 0 ; function_names[i] != NULL ; i++ ) {
-      if (! is_static[i] ) {
-	 if (entry[i] == NULL) {
-	    entry[i] = add_function_name( function_names[i] );
-	    if (entry[i] == NULL) {
-	       /* FIXME: Possible memory leak here.
-		*/
-	       return -1;
-	    }
-	 }
-
-	 entry[i]->parameter_signature = str_dup(real_sig);
-	 fill_in_entrypoint_offset(entry[i]->dispatch_stub, offset);
-	 entry[i]->dispatch_offset = offset;
-      }
-   }
-   
-   return offset;
-}
-
-/**
- * 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)
-{
-   struct _glapi_function * entry;
-   GLuint i;
-
-#ifdef MANGLE
-   if (funcName[0] != 'm' || funcName[1] != 'g' || funcName[2] != 'l')
-      return NULL;
-#else
-   if (funcName[0] != 'g' || funcName[1] != 'l')
-      return NULL;
-#endif
-
-   /* search extension functions first */
-   for (i = 0; i < NumExtEntryPoints; i++) {
-      if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
-         return ExtEntryTable[i].dispatch_stub;
-      }
-   }
-
-#if !defined( XFree86Server ) && !defined( XGLServer )
-   /* search static functions */
-   {
-      const _glapi_proc func = get_static_proc_address(funcName);
-      if (func)
-         return func;
-   }
-#endif /* !defined( XFree86Server ) */
-
-   entry = add_function_name(funcName);
-   return (entry == NULL) ? NULL : entry->dispatch_stub;
-}
-
-/**
- * Return size of dispatch table struct as number of functions (or
- * slots).
- */
-PUBLIC GLuint
-_glapi_get_dispatch_table_size(void)
-{
-   return DISPATCH_TABLE_SIZE;
-}
-
-#if defined(PTHREADS) || defined(GLX_USE_TLS)
-/**
- * Perform platform-specific GL API entry-point fixups.
- */
-static void
-init_glapi_relocs( void )
-{
-#if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
-    extern unsigned long _x86_get_dispatch(void);
-    char run_time_patch[] = {
-       0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
-    };
-    GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
-    const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
-    GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
-
-    *offset = _x86_get_dispatch();
-    while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
-	(void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
-	curr_func += DISPATCH_FUNCTION_SIZE;
-    }
-#endif
-}
-#endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */
+/*

+ * Mesa 3-D graphics library

+ * Version:  6.5

+ *

+ * Copyright (C) 1999-2006  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.

+ */

+

+/*

+ * This file manages the OpenGL API dispatch layer.  There are functions

+ * to set/get the current dispatch table for the current thread and to

+ * manage registration/dispatch of dynamically added extension functions.

+ *

+ * This code was originally general enough to be shared with Mesa, but

+ * they diverged long ago, so this is now just enough support to make

+ * indirect GLX work.

+ */

+

+#include <dix-config.h>

+#include <X11/Xfuncproto.h>

+#include <os.h>

+#define PUBLIC _X_EXPORT

+

+#include <stdlib.h>

+#include <string.h>

+#ifdef DEBUG

+#include <assert.h>

+#endif

+

+#include "glapi.h"

+#include "glapioffsets.h"

+#include "glapitable.h"

+

+#if defined(PTHREADS) || defined(GLX_USE_TLS)

+static void init_glapi_relocs(void);

+#endif

+

+/**

+ * \name Current dispatch and current context control variables

+ *

+ * Depending on whether or not multithreading is support, and the type of

+ * support available, several variables are used to store the current context

+ * pointer and the current dispatch table pointer.  In the non-threaded case,

+ * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this

+ * purpose.

+ *

+ * In the "normal" threaded case, the variables \c _glapi_Dispatch and

+ * \c _glapi_Context will be \c NULL if an application is detected as being

+ * multithreaded.  Single-threaded applications will use \c _glapi_Dispatch

+ * and \c _glapi_Context just like the case without any threading support.

+ * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state

+ * data \c _gl_DispatchTSD and \c ContextTSD are used.  Drivers and the

+ * static dispatch functions access these variables via \c _glapi_get_dispatch

+ * and \c _glapi_get_context.

+ *

+ * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are

+ * hardcoded to \c NULL.  Instead the TLS variables \c _glapi_tls_Dispatch and

+ * \c _glapi_tls_Context are used.  Having \c _glapi_Dispatch and

+ * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability

+ * between TLS enabled loaders and non-TLS DRI drivers.

+ */

+/*@{*/

+#if defined(GLX_USE_TLS)

+

+PUBLIC TLS struct _glapi_table * _glapi_tls_Dispatch

+    __attribute__((tls_model("initial-exec"))) = NULL;

+

+PUBLIC TLS void * _glapi_tls_Context

+    __attribute__((tls_model("initial-exec")));

+

+PUBLIC const struct _glapi_table *_glapi_Dispatch = NULL;

+PUBLIC const void *_glapi_Context = NULL;

+

+#else

+

+#if defined(THREADS)

+

+_glthread_TSD _gl_DispatchTSD;           /**< Per-thread dispatch pointer */

+static _glthread_TSD ContextTSD;         /**< Per-thread context pointer */

+

+#if defined(WIN32_THREADS)

+void FreeTSD(_glthread_TSD *p);

+void FreeAllTSD(void)

+{

+   FreeTSD(&_gl_DispatchTSD);

+   FreeTSD(&ContextTSD);

+}

+#endif /* defined(WIN32_THREADS) */

+

+#endif /* defined(THREADS) */

+

+PUBLIC struct _glapi_table *_glapi_Dispatch = NULL;

+PUBLIC void *_glapi_Context = NULL;

+

+#endif /* defined(GLX_USE_TLS) */

+/*@}*/

+

+/*

+ * xserver's gl is not multithreaded, we promise.

+ */

+PUBLIC void

+_glapi_check_multithread(void)

+{

+}

+

+/**

+ * Set the current context pointer for this thread.

+ * The context pointer is an opaque type which should be cast to

+ * void from the real context pointer type.

+ */

+PUBLIC void

+_glapi_set_context(void *context)

+{

+#if defined(GLX_USE_TLS)

+   _glapi_tls_Context = context;

+#elif defined(THREADS)

+   _glthread_SetTSD(&ContextTSD, context);

+   _glapi_Context = context;

+#else

+   _glapi_Context = context;

+#endif

+}

+

+

+

+/**

+ * Get the current context pointer for this thread.

+ * The context pointer is an opaque type which should be cast from

+ * void to the real context pointer type.

+ */

+PUBLIC void *

+_glapi_get_context(void)

+{

+#if defined(GLX_USE_TLS)

+   return _glapi_tls_Context;

+#else

+   return _glapi_Context;

+#endif

+}

+

+

+

+/**

+ * Set the global or per-thread dispatch table pointer.

+ */

+PUBLIC void

+_glapi_set_dispatch(struct _glapi_table *dispatch)

+{

+#if defined(PTHREADS) || defined(GLX_USE_TLS)

+   static pthread_once_t once_control = PTHREAD_ONCE_INIT;

+   pthread_once( & once_control, init_glapi_relocs );

+#endif

+

+#if defined(GLX_USE_TLS)

+   _glapi_tls_Dispatch = dispatch;

+#elif defined(THREADS)

+   _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);

+   _glapi_Dispatch = dispatch;

+#else /*THREADS*/

+   _glapi_Dispatch = dispatch;

+#endif /*THREADS*/

+}

+

+

+

+/**

+ * Return pointer to current dispatch table for calling thread.

+ */

+PUBLIC struct _glapi_table *

+_glapi_get_dispatch(void)

+{

+   struct _glapi_table * api;

+#if defined(GLX_USE_TLS)

+   api = _glapi_tls_Dispatch;

+#else

+   api = _glapi_Dispatch;

+#endif

+   return api;

+}

+

+

+

+/***

+ *** The rest of this file is pretty much concerned with GetProcAddress

+ *** functionality.

+ ***/

+

+#if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)

+# define DISPATCH_FUNCTION_SIZE  16

+#elif defined(USE_X86_ASM)

+# if defined(THREADS) && !defined(GLX_USE_TLS)

+#  define DISPATCH_FUNCTION_SIZE  32

+# else

+#  define DISPATCH_FUNCTION_SIZE  16

+# endif

+#endif

+

+

+/* The code in this file is auto-generated with Python */

+#include "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 *

+find_entry( 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;

+      if (strcmp(testName, n) == 0) {

+	 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 = find_entry( funcName );

+   if (f) {

+      return f->Offset;

+   }

+   return -1;

+}

+

+

+

+/**********************************************************************

+ * Extension function management.

+ */

+

+/*

+ * Number of extension functions which we can dynamically add at runtime.

+ */

+#define MAX_EXTENSION_FUNCS 300

+

+

+/*

+ * 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)

+

+

+/**

+ * 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;

+};

+

+static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];

+static GLuint NumExtEntryPoints = 0;

+

+/**

+ * 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;

+   

+   if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) {

+      entry = &ExtEntryTable[NumExtEntryPoints];

+

+      ExtEntryTable[NumExtEntryPoints].name = strdup(funcName);

+      ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL;

+      ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0;

+      NumExtEntryPoints++;

+   }

+

+   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].

+ *

+ * \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.

+ */

+

+PUBLIC 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;

+   unsigned j;

+   int offset = ~0;

+   int new_offset;

+

+

+   (void) memset(is_static, 0, sizeof(is_static));

+   (void) memset(entry, 0, sizeof(entry));

+

+   for (i = 0 ; function_names[i] != NULL ; i++) {

+      /* Do some trivial validation on the name of the function. */

+

+      if (function_names[i][0] != 'g' || function_names[i][1] != 'l')

+	return GL_FALSE;

+   

+      /* Determine if the named function already exists.  If the function does

+       * exist, it must have the same parameter signature as the function

+       * being added.

+       */

+

+      new_offset = get_static_proc_offset(function_names[i]);

+      if (new_offset >= 0) {

+	 /* FIXME: Make sure the parameter signatures match!  How do we get

+	  * FIXME: the parameter signature for static functions?

+	  */

+

+	 if ((offset != ~0) && (new_offset != offset)) {

+	    return -1;

+	 }

+

+	 is_static[i] = GL_TRUE;

+	 offset = new_offset;

+      }

+   

+      for (j = 0; j < NumExtEntryPoints; j++) {

+	 if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) {

+	    /* The offset may be ~0 if the function name was added by

+	     * glXGetProcAddress but never filled in by the driver.

+	     */

+

+	    if (ExtEntryTable[j].dispatch_offset != ~0) {

+	       if (strcmp(real_sig, ExtEntryTable[j].parameter_signature) != 0)

+		  return -1;

+

+	       if ((offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset)) {

+		  return -1;

+	       }

+

+	       offset = ExtEntryTable[j].dispatch_offset;

+	    }

+	    

+	    entry[i] = & ExtEntryTable[j];

+	    break;

+	 }

+      }

+   }

+

+   if (offset == ~0) {

+      offset = next_dynamic_offset;

+      next_dynamic_offset++;

+   }

+

+   for (i = 0 ; function_names[i] != NULL ; i++) {

+      if (!is_static[i]) {

+	 if (entry[i] == NULL) {

+	    entry[i] = add_function_name(function_names[i]);

+	    if (entry[i] == NULL)

+	       return -1;

+	 }

+

+	 entry[i]->parameter_signature = strdup(real_sig);

+	 entry[i]->dispatch_offset = offset;

+      }

+   }

+   

+   return offset;

+}

+

+/*

+ * glXGetProcAddress doesn't exist in the protocol, the drivers never call

+ * this themselves, and neither does the server.  warn if it happens though.

+ */

+PUBLIC _glapi_proc

+_glapi_get_proc_address(const char *funcName)

+{

+    ErrorF("_glapi_get_proc_address called!\n");

+    return NULL;

+}

+

+/**

+ * Return size of dispatch table struct as number of functions (or

+ * slots).

+ */

+PUBLIC GLuint

+_glapi_get_dispatch_table_size(void)

+{

+   return DISPATCH_TABLE_SIZE;

+}

+

+#if defined(PTHREADS) || defined(GLX_USE_TLS)

+/**

+ * Perform platform-specific GL API entry-point fixups.

+ */

+static void

+init_glapi_relocs( void )

+{

+#if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)

+    extern unsigned long _x86_get_dispatch(void);

+    char run_time_patch[] = {

+       0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */

+    };

+    GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */

+    const GLubyte * const get_disp = (const GLubyte *) run_time_patch;

+    GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;

+

+    *offset = _x86_get_dispatch();

+    while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {

+	(void) memcpy( curr_func, get_disp, sizeof(run_time_patch));

+	curr_func += DISPATCH_FUNCTION_SIZE;

+    }

+#endif

+}

+#endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */