511 lines
15 KiB
C
511 lines
15 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.5
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*
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* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* This file manages the OpenGL API dispatch layer. There are functions
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* to set/get the current dispatch table for the current thread and to
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* manage registration/dispatch of dynamically added extension functions.
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*
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* This code was originally general enough to be shared with Mesa, but
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* they diverged long ago, so this is now just enough support to make
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* indirect GLX work.
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*/
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#include <dix-config.h>
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#include <X11/Xfuncproto.h>
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#include <os.h>
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#define PUBLIC _X_EXPORT
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#include <stdlib.h>
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#include <string.h>
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#ifdef DEBUG
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#include <assert.h>
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#endif
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#include "glapi.h"
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#include "glapioffsets.h"
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#include "glapitable.h"
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#if defined(PTHREADS) || defined(GLX_USE_TLS)
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static void init_glapi_relocs(void);
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#endif
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/**
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* \name Current dispatch and current context control variables
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*
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* Depending on whether or not multithreading is support, and the type of
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* support available, several variables are used to store the current context
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* pointer and the current dispatch table pointer. In the non-threaded case,
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* the variables \c _glapi_Dispatch and \c _glapi_Context are used for this
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* purpose.
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*
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* In the "normal" threaded case, the variables \c _glapi_Dispatch and
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* \c _glapi_Context will be \c NULL if an application is detected as being
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* multithreaded. Single-threaded applications will use \c _glapi_Dispatch
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* and \c _glapi_Context just like the case without any threading support.
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* When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state
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* data \c _gl_DispatchTSD and \c ContextTSD are used. Drivers and the
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* static dispatch functions access these variables via \c _glapi_get_dispatch
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* and \c _glapi_get_context.
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*
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* In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are
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* hardcoded to \c NULL. Instead the TLS variables \c _glapi_tls_Dispatch and
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* \c _glapi_tls_Context are used. Having \c _glapi_Dispatch and
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* \c _glapi_Context be hardcoded to \c NULL maintains binary compatability
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* between TLS enabled loaders and non-TLS DRI drivers.
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*/
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/*@{*/
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#if defined(GLX_USE_TLS)
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PUBLIC TLS struct _glapi_table * _glapi_tls_Dispatch = NULL;
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PUBLIC TLS void * _glapi_tls_Context;
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PUBLIC const struct _glapi_table *_glapi_Dispatch = NULL;
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PUBLIC const void *_glapi_Context = NULL;
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#else
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#if defined(THREADS)
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_glthread_TSD _gl_DispatchTSD; /**< Per-thread dispatch pointer */
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static _glthread_TSD ContextTSD; /**< Per-thread context pointer */
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#if defined(WIN32_THREADS)
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void FreeTSD(_glthread_TSD *p);
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void FreeAllTSD(void)
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{
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FreeTSD(&_gl_DispatchTSD);
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FreeTSD(&ContextTSD);
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}
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#endif /* defined(WIN32_THREADS) */
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#endif /* defined(THREADS) */
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PUBLIC struct _glapi_table *_glapi_Dispatch = NULL;
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PUBLIC void *_glapi_Context = NULL;
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#endif /* defined(GLX_USE_TLS) */
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/*@}*/
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/*
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* xserver's gl is not multithreaded, we promise.
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*/
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PUBLIC void
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_glapi_check_multithread(void)
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{
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}
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/**
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* Set the current context pointer for this thread.
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* The context pointer is an opaque type which should be cast to
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* void from the real context pointer type.
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*/
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PUBLIC void
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_glapi_set_context(void *context)
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{
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#if defined(GLX_USE_TLS)
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_glapi_tls_Context = context;
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#elif defined(THREADS)
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_glthread_SetTSD(&ContextTSD, context);
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_glapi_Context = context;
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#else
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_glapi_Context = context;
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#endif
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}
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/**
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* Get the current context pointer for this thread.
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* The context pointer is an opaque type which should be cast from
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* void to the real context pointer type.
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*/
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PUBLIC void *
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_glapi_get_context(void)
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{
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#if defined(GLX_USE_TLS)
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return _glapi_tls_Context;
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#else
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return _glapi_Context;
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#endif
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}
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/**
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* Set the global or per-thread dispatch table pointer.
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*/
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PUBLIC void
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_glapi_set_dispatch(struct _glapi_table *dispatch)
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{
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#if defined(PTHREADS) || defined(GLX_USE_TLS)
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static pthread_once_t once_control = PTHREAD_ONCE_INIT;
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pthread_once( & once_control, init_glapi_relocs );
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#endif
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#if defined(GLX_USE_TLS)
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_glapi_tls_Dispatch = dispatch;
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#elif defined(THREADS)
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_glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
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_glapi_Dispatch = dispatch;
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#else /*THREADS*/
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_glapi_Dispatch = dispatch;
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#endif /*THREADS*/
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}
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/**
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* Return pointer to current dispatch table for calling thread.
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*/
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PUBLIC struct _glapi_table *
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_glapi_get_dispatch(void)
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{
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struct _glapi_table * api;
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#if defined(GLX_USE_TLS)
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api = _glapi_tls_Dispatch;
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#else
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api = _glapi_Dispatch;
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#endif
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return api;
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}
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/***
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*** The rest of this file is pretty much concerned with GetProcAddress
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*** functionality.
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***/
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#if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS)
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# define DISPATCH_FUNCTION_SIZE 16
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#elif defined(USE_X86_ASM)
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# if defined(THREADS) && !defined(GLX_USE_TLS)
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# define DISPATCH_FUNCTION_SIZE 32
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# else
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# define DISPATCH_FUNCTION_SIZE 16
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# endif
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#endif
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/* The code in this file is auto-generated with Python */
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#include "glprocs.h"
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/**
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* Search the table of static entrypoint functions for the named function
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* and return the corresponding glprocs_table_t entry.
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*/
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static const glprocs_table_t *
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find_entry( const char * n )
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{
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GLuint i;
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for (i = 0; static_functions[i].Name_offset >= 0; i++) {
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const char *testName = gl_string_table + static_functions[i].Name_offset;
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if (strcmp(testName, n) == 0) {
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return &static_functions[i];
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}
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}
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return NULL;
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}
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/**
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* Return dispatch table offset of the named static (built-in) function.
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* Return -1 if function not found.
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*/
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static GLint
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get_static_proc_offset(const char *funcName)
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{
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const glprocs_table_t * const f = find_entry( funcName );
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if (f) {
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return f->Offset;
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}
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return -1;
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}
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/**********************************************************************
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* Extension function management.
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*/
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/*
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* Number of extension functions which we can dynamically add at runtime.
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*/
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#define MAX_EXTENSION_FUNCS 300
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/*
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* The dispatch table size (number of entries) is the size of the
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* _glapi_table struct plus the number of dynamic entries we can add.
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* The extra slots can be filled in by DRI drivers that register new extension
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* functions.
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*/
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#define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
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/**
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* Track information about a function added to the GL API.
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*/
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struct _glapi_function {
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/**
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* Name of the function.
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*/
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const char * name;
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/**
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* Text string that describes the types of the parameters passed to the
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* named function. Parameter types are converted to characters using the
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* following rules:
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* - 'i' for \c GLint, \c GLuint, and \c GLenum
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* - 'p' for any pointer type
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* - 'f' for \c GLfloat and \c GLclampf
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* - 'd' for \c GLdouble and \c GLclampd
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*/
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const char * parameter_signature;
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/**
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* Offset in the dispatch table where the pointer to the real function is
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* located. If the driver has not requested that the named function be
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* added to the dispatch table, this will have the value ~0.
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*/
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unsigned dispatch_offset;
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};
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static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];
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static GLuint NumExtEntryPoints = 0;
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/**
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* Generate new entrypoint
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*
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* Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
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* calls \c _glapi_add_dispatch we'll put in the proper offset. If that
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* never happens, and the user calls this function, he'll segfault. That's
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* what you get when you try calling a GL function that doesn't really exist.
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*
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* \param funcName Name of the function to create an entry-point for.
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*
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* \sa _glapi_add_entrypoint
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*/
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static struct _glapi_function *
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add_function_name( const char * funcName )
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{
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struct _glapi_function * entry = NULL;
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if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) {
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entry = &ExtEntryTable[NumExtEntryPoints];
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ExtEntryTable[NumExtEntryPoints].name = strdup(funcName);
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ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL;
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ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0;
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NumExtEntryPoints++;
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}
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return entry;
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}
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/**
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* Fill-in the dispatch stub for the named function.
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*
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* This function is intended to be called by a hardware driver. When called,
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* a dispatch stub may be created created for the function. A pointer to this
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* dispatch function will be returned by glXGetProcAddress.
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*
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* \param function_names Array of pointers to function names that should
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* share a common dispatch offset.
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* \param parameter_signature String representing the types of the parameters
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* passed to the named function. Parameter types
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* are converted to characters using the following
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* rules:
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* - 'i' for \c GLint, \c GLuint, and \c GLenum
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* - 'p' for any pointer type
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* - 'f' for \c GLfloat and \c GLclampf
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* - 'd' for \c GLdouble and \c GLclampd
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*
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* \returns
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* The offset in the dispatch table of the named function. A pointer to the
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* driver's implementation of the named function should be stored at
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* \c dispatch_table[\c offset].
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*
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* \sa glXGetProcAddress
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*
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* \warning
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* This function can only handle up to 8 names at a time. As far as I know,
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* the maximum number of names ever associated with an existing GL function is
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* 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
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* \c glPointParameterfARB, and \c glPointParameterf), so this should not be
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* too painful of a limitation.
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*
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* \todo
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* Determine whether or not \c parameter_signature should be allowed to be
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* \c NULL. It doesn't seem like much of a hardship for drivers to have to
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* pass in an empty string.
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*
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* \todo
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* Determine if code should be added to reject function names that start with
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* 'glX'.
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*
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* \bug
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* Add code to compare \c parameter_signature with the parameter signature of
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* a static function. In order to do that, we need to find a way to \b get
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* the parameter signature of a static function.
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*/
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PUBLIC int
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_glapi_add_dispatch( const char * const * function_names,
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const char * parameter_signature )
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{
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static int next_dynamic_offset = _gloffset_FIRST_DYNAMIC;
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const char * const real_sig = (parameter_signature != NULL)
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? parameter_signature : "";
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struct _glapi_function * entry[8];
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GLboolean is_static[8];
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unsigned i;
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unsigned j;
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int offset = ~0;
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int new_offset;
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(void) memset(is_static, 0, sizeof(is_static));
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(void) memset(entry, 0, sizeof(entry));
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for (i = 0 ; function_names[i] != NULL ; i++) {
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/* Do some trivial validation on the name of the function. */
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if (function_names[i][0] != 'g' || function_names[i][1] != 'l')
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return GL_FALSE;
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/* Determine if the named function already exists. If the function does
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* exist, it must have the same parameter signature as the function
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* being added.
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*/
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new_offset = get_static_proc_offset(function_names[i]);
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if (new_offset >= 0) {
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/* FIXME: Make sure the parameter signatures match! How do we get
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* FIXME: the parameter signature for static functions?
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*/
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if ((offset != ~0) && (new_offset != offset)) {
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return -1;
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}
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is_static[i] = GL_TRUE;
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offset = new_offset;
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}
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for (j = 0; j < NumExtEntryPoints; j++) {
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if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) {
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/* The offset may be ~0 if the function name was added by
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* glXGetProcAddress but never filled in by the driver.
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*/
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if (ExtEntryTable[j].dispatch_offset != ~0) {
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if (strcmp(real_sig, ExtEntryTable[j].parameter_signature) != 0)
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return -1;
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if ((offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset)) {
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return -1;
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}
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offset = ExtEntryTable[j].dispatch_offset;
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}
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entry[i] = & ExtEntryTable[j];
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break;
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}
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}
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}
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if (offset == ~0) {
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offset = next_dynamic_offset;
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next_dynamic_offset++;
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}
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for (i = 0 ; function_names[i] != NULL ; i++) {
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if (!is_static[i]) {
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if (entry[i] == NULL) {
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entry[i] = add_function_name(function_names[i]);
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if (entry[i] == NULL)
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return -1;
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}
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entry[i]->parameter_signature = strdup(real_sig);
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entry[i]->dispatch_offset = offset;
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}
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}
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return offset;
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}
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/*
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* glXGetProcAddress doesn't exist in the protocol, the drivers never call
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* this themselves, and neither does the server. warn if it happens though.
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*/
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PUBLIC _glapi_proc
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_glapi_get_proc_address(const char *funcName)
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{
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ErrorF("_glapi_get_proc_address called!\n");
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return NULL;
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}
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/**
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* Return size of dispatch table struct as number of functions (or
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* slots).
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*/
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PUBLIC GLuint
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_glapi_get_dispatch_table_size(void)
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{
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return DISPATCH_TABLE_SIZE;
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}
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#if defined(PTHREADS) || defined(GLX_USE_TLS)
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/**
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* Perform platform-specific GL API entry-point fixups.
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*/
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static void
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init_glapi_relocs( void )
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{
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#if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
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extern unsigned long _x86_get_dispatch(void);
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char run_time_patch[] = {
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0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
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};
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GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
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const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
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GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
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*offset = _x86_get_dispatch();
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while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
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(void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
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curr_func += DISPATCH_FUNCTION_SIZE;
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}
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#endif
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}
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#endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */
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