IABSD.fr/xenocara/lib/mesa/src/mapi/u_current.c

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• Author : jsg
  Date : 2025-06-05 14:17:56
  Hash : 452696b8
  Message : Merge Mesa 25.0.7

• lib/mesa/src/mapi/u_current.c

• /*
   * Mesa 3-D graphics library
   *
   * 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
   * THE AUTHORS OR COPYRIGHT HOLDERS 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  - _mesa_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.
   */
  
  #include "c11/threads.h"
  #include "util/u_thread.h"
  #include "u_current.h"
  
  #ifndef MAPI_MODE_UTIL
  
  #include "table.h"
  #include "stub.h"
  
  #else
  
  extern void init_glapi_relocs_once(void);
  extern void (*__glapi_noop_table[])(void);
  
  #define table_noop_array __glapi_noop_table
  #define stub_init_once() init_glapi_relocs_once()
  
  #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 _mesa_glapi_Dispatch and \c _glapi_Context are used for this
   * purpose.
   *
   * In multi threaded case, The TLS variables \c _mesa_glapi_tls_Dispatch and
   * \c _mesa_glapi_tls_Context are used. Having \c _mesa_glapi_Dispatch and \c _glapi_Context
   * be hardcoded to \c NULL maintains binary compatability between TLS enabled
   * loaders and non-TLS DRI drivers. When \c _mesa_glapi_Dispatch and \c _glapi_Context
   * are \c NULL, the thread state data \c ContextTSD are used. Drivers and the
   * static dispatch functions access these variables via \c _mesa_glapi_get_dispatch
   * and \c _mesa_glapi_get_context.
   */
  /*@{*/
  
  __THREAD_INITIAL_EXEC struct _glapi_table *_mesa_glapi_tls_Dispatch
     = (struct _glapi_table *) table_noop_array;
  
  __THREAD_INITIAL_EXEC void *_mesa_glapi_tls_Context;
  
  /* not used, but defined for compatibility */
  const struct _glapi_table *_mesa_glapi_Dispatch;
  const void *_glapi_Context;
  
  /*@}*/
  
  /* not used, but defined for compatibility */
  void
  _glapi_destroy_multithread(void)
  {
  }
  
  /* not used, but defined for compatibility */
  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.
   */
  void
  _mesa_glapi_set_context(void *ptr)
  {
     _mesa_glapi_tls_Context = ptr;
  }
  
  /**
   * 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.
   */
  void *
  _mesa_glapi_get_context(void)
  {
     return _mesa_glapi_tls_Context;
  }
  
  /**
   * 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).
   */
  void
  _mesa_glapi_set_dispatch(struct _glapi_table *tbl)
  {
     stub_init_once();
  
     if (!tbl)
        tbl = (struct _glapi_table *) table_noop_array;
  
     _mesa_glapi_tls_Dispatch = tbl;
  }
  
  /**
   * Return pointer to current dispatch table for calling thread.
   */
  struct _glapi_table *
  _mesa_glapi_get_dispatch(void)
  {
     return _mesa_glapi_tls_Dispatch;
  }