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Diffstat (limited to 'src/mesa/glapi/glapi.c')
| -rw-r--r-- | src/mesa/glapi/glapi.c | 293 |
1 files changed, 0 insertions, 293 deletions
diff --git a/src/mesa/glapi/glapi.c b/src/mesa/glapi/glapi.c deleted file mode 100644 index ce85cf6a87b..00000000000 --- a/src/mesa/glapi/glapi.c +++ /dev/null @@ -1,293 +0,0 @@ -/* - * 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. - */ - - -/* - * 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 "glapi/mesa.h" -#else -#include "main/glheader.h" -#include "main/compiler.h" -#endif - -#include "glapi/glapi.h" -#include "glapi/glapi_priv.h" - -extern _glapi_proc __glapi_noop_table[]; - - -/** - * \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. - * - * There is a race condition in setting \c _glapi_Dispatch to \c NULL. It is - * possible for the original thread to be setting it at the same instant a new - * thread, perhaps running on a different processor, is clearing it. Because - * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is - * used to determine whether or not the application is multithreaded. - * - * 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 __thread struct _glapi_table * _glapi_tls_Dispatch - __attribute__((tls_model("initial-exec"))) - = (struct _glapi_table *) __glapi_noop_table; - -PUBLIC __thread 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) - -static GLboolean ThreadSafe = GL_FALSE; /**< In thread-safe mode? */ - -_glthread_TSD _gl_DispatchTSD; /**< Per-thread dispatch pointer */ - -static _glthread_TSD ContextTSD; /**< Per-thread context pointer */ - -#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) */ -/*@}*/ - - - -#if defined(THREADS) && !defined(GLX_USE_TLS) - -void -_glapi_init_multithread(void) -{ - _glthread_InitTSD(&_gl_DispatchTSD); - _glthread_InitTSD(&ContextTSD); -} - -void -_glapi_destroy_multithread(void) -{ -#ifdef WIN32_THREADS - _glthread_DestroyTSD(&_gl_DispatchTSD); - _glthread_DestroyTSD(&ContextTSD); -#endif -} - -/** - * Mutex for multithread check. - */ -#ifdef WIN32_THREADS -/* _glthread_DECLARE_STATIC_MUTEX is broken on windows. There will be race! */ -#define CHECK_MULTITHREAD_LOCK() -#define CHECK_MULTITHREAD_UNLOCK() -#else -_glthread_DECLARE_STATIC_MUTEX(ThreadCheckMutex); -#define CHECK_MULTITHREAD_LOCK() _glthread_LOCK_MUTEX(ThreadCheckMutex) -#define CHECK_MULTITHREAD_UNLOCK() _glthread_UNLOCK_MUTEX(ThreadCheckMutex) -#endif - -/** - * We should call this periodically from a function such as glXMakeCurrent - * in order to test if multiple threads are being used. - */ -PUBLIC void -_glapi_check_multithread(void) -{ - static unsigned long knownID; - static GLboolean firstCall = GL_TRUE; - - if (ThreadSafe) - return; - - CHECK_MULTITHREAD_LOCK(); - if (firstCall) { - _glapi_init_multithread(); - - knownID = _glthread_GetID(); - firstCall = GL_FALSE; - } - else if (knownID != _glthread_GetID()) { - ThreadSafe = GL_TRUE; - _glapi_set_dispatch(NULL); - _glapi_set_context(NULL); - } - CHECK_MULTITHREAD_UNLOCK(); -} - -#else - -void -_glapi_init_multithread(void) { } - -void -_glapi_destroy_multithread(void) { } - -PUBLIC void -_glapi_check_multithread(void) { } - -#endif - - - -/** - * 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 = (ThreadSafe) ? NULL : 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; -#elif defined(THREADS) - return (ThreadSafe) ? _glthread_GetTSD(&ContextTSD) : _glapi_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) -{ - init_glapi_relocs_once(); - - if (dispatch == NULL) { - /* use the no-op functions */ - dispatch = (struct _glapi_table *) __glapi_noop_table; - } -#ifdef DEBUG - else { - _glapi_check_table_not_null(dispatch); - _glapi_check_table(dispatch); - } -#endif - -#if defined(GLX_USE_TLS) - _glapi_tls_Dispatch = dispatch; -#elif defined(THREADS) - _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch); - _glapi_Dispatch = (ThreadSafe) ? NULL : dispatch; -#else - _glapi_Dispatch = dispatch; -#endif -} - - - -/** - * Return pointer to current dispatch table for calling thread. - */ -PUBLIC struct _glapi_table * -_glapi_get_dispatch(void) -{ -#if defined(GLX_USE_TLS) - return _glapi_tls_Dispatch; -#elif defined(THREADS) - return (ThreadSafe) - ? (struct _glapi_table *) _glthread_GetTSD(&_gl_DispatchTSD) - : _glapi_Dispatch; -#else - return _glapi_Dispatch; -#endif -} |