src/mesa/main/remap.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file remap.c
  28  * Remap table management.
  29  *
  30  * Entries in the dispatch table are either static or dynamic.  The
  31  * dispatch table is shared by mesa core and glapi.  When they are
  32  * built separately, it is possible that a static entry in mesa core
  33  * is dynamic, or assigned a different static offset, in glapi.  The
  34  * remap table is in charge of mapping a static entry in mesa core to
  35  * a dynamic entry, or the corresponding static entry, in glapi.
  36  */
  37
  38 #include <stdbool.h>
  39 #include "remap.h"
  40 #include "imports.h"
  41 #include "glapi/glapi.h"
  42
  43 #define MAX_ENTRY_POINTS 16
  44
  45 #define need_MESA_remap_table
  46 #include "main/remap_helper.h"
  47
  48
  49 /* this is global for quick access */
  50 int driDispatchRemapTable[driDispatchRemapTable_size];
  51
  52
  53 /**
  54  * Map a function by its spec.  The function will be added to glapi,
  55  * and the dispatch offset will be returned.
  56  *
  57  * \param spec a '\0'-separated string array specifying a function.
  58  *        It begins with the parameter signature of the function,
  59  *        followed by the names of the entry points.  An empty entry
  60  *        point name terminates the array.
  61  *
  62  * \return the offset of the (re-)mapped function in the dispatch
  63  *         table, or -1.
  64  */
  65 static int
  66 map_function_spec(const char *spec)
  67 {
  68    const char *signature;
  69    const char *names[MAX_ENTRY_POINTS + 1];
  70    int num_names = 0;
  71
  72    if (!spec)
  73       return -1;
  74
  75    signature = spec;
  76    spec += strlen(spec) + 1;
  77
  78    /* spec is terminated by an empty string */
  79    while (*spec) {
  80       names[num_names] = spec;
  81       num_names++;
  82       if (num_names >= MAX_ENTRY_POINTS)
  83          break;
  84       spec += strlen(spec) + 1;
  85    }
  86    if (!num_names)
  87       return -1;
  88
  89    names[num_names] = NULL;
  90
  91    /* add the entry points to the dispatch table */
  92    return _glapi_add_dispatch(names, signature);
  93 }
  94
  95
  96 /**
  97  * Initialize the remap table.  This is called in one_time_init().
  98  * The remap table needs to be initialized before calling the
  99  * CALL/GET/SET macros defined in main/dispatch.h.
 100  */
 101 void
 102 _mesa_init_remap_table(void)
 103 {
 104    static bool initialized = false;
 105    GLint i;
 106
 107    if (initialized)
 108       return;
 109    initialized = true;
 110
 111    /* initialize the MESA_remap_table_functions table */
 112    for (i = 0; i < driDispatchRemapTable_size; i++) {
 113       int offset;
 114       const char *spec;
 115
 116       /* sanity check */
 117       assert(i == MESA_remap_table_functions[i].remap_index);
 118       spec = _mesa_function_pool + MESA_remap_table_functions[i].pool_index;
 119
 120       offset = map_function_spec(spec);
 121       /* store the dispatch offset in the MESA_remap_table_functions table */
 122       driDispatchRemapTable[i] = offset;
 123       if (offset < 0) {
 124          const char *name = spec + strlen(spec) + 1;
 125          _mesa_warning(NULL, "failed to remap %s", name);
 126       }
 127    }
 128 }