IABSD.fr/xenocara/lib/mesa/src/mapi/glapi/glapi_getproc.c

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• Author : jsg
  Date : 2025-06-05 11:23:11
  Hash : 67d6f117
  Message : Import Mesa 25.0.7

• lib/mesa/src/mapi/glapi/glapi_getproc.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.
   */
  
  /**
   * \file glapi_getproc.c
   *
   * Code for implementing glXGetProcAddress(), etc.
   * This was originally in glapi.c but refactored out.
   */
  
  
  #include <assert.h>
  #include <string.h>
  #include <stdlib.h>
  #include "glapi/glapi_priv.h"
  #include "glapitable.h"
  
  
  /**********************************************************************
   * Static function management.
   */
  
  
  #if !defined(DISPATCH_FUNCTION_SIZE)
  # define NEED_FUNCTION_POINTER
  #endif
  #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 *
  get_static_proc(const char *n)
  {
     GLuint i;
     for (i = 0; static_functions[i].Name_offset >= 0; i++) {
        const char *testName = gl_string_table + static_functions[i].Name_offset;
        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 = get_static_proc(funcName);
     if (f == NULL) {
        return -1;
     }
  
     return f->Offset;
  }
  
  
  /**********************************************************************
   * Extension function management.
   */
  
  /**
   * Initializes the glapi relocs table, and returns the offset of the given
   * function in the dispatch table.
   */
  int
  _glapi_add_dispatch(const char *funcName)
  {
     init_glapi_relocs_once();
  
     return get_static_proc_offset(funcName);
  }
  
  /**
   * Return offset of entrypoint for named function within dispatch table.
   */
  GLint
  _mesa_glapi_get_proc_offset(const char *funcName)
  {
     /* search static functions */
     return get_static_proc_offset(funcName);
  }
  
  
  
  /**
   * Return dispatch function address for the named static (built-in) function.
   * Return NULL if function not found.
   */
  _glapi_proc
  _mesa_glapi_get_proc_address(const char *funcName)
  {
     init_glapi_relocs_once();
  
     if (!funcName || funcName[0] != 'g' || funcName[1] != 'l')
        return NULL;
  
     const glprocs_table_t *const f = get_static_proc(funcName);
     if (f == NULL) {
        return NULL;
     }
  
  #if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING)
     return (f->Address == NULL)
        ? get_entrypoint_address(f->Offset)
        : f->Address;
  #elif defined(DISPATCH_FUNCTION_SIZE)
     return get_entrypoint_address(f->Offset);
  #else
     return f->Address;
  #endif
  }
  
  
  
  /**
   * Return the name of the function at the given dispatch offset.
   * This is only intended for debugging.
   */
  const char *
  _glapi_get_proc_name(GLuint offset)
  {
     GLuint i;
     for (i = 0; static_functions[i].Name_offset >= 0; i++) {
        if (static_functions[i].Offset == offset) {
           return gl_string_table + static_functions[i].Name_offset;
        }
     }
     return NULL;
  }
  
  
  
  /**********************************************************************
   * GL API table functions.
   */
  
  
  /**
   * Return size of dispatch table struct as number of functions (or
   * slots).
   */
  GLuint
  _mesa_glapi_get_dispatch_table_size(void)
  {
     return sizeof(struct _glapi_table) / sizeof(void *);
  }