src/mesa/main/remap.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.7
   4  *
   5  * Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * \file remap.c
  29  * Remap table management.
  30  *
  31  * Entries in the dispatch table are either static or dynamic.  The
  32  * dispatch table is shared by mesa core and glapi.  When they are
  33  * built separately, it is possible that a static entry in mesa core
  34  * is dynamic, or assigned a different static offset, in glapi.  The
  35  * remap table is in charge of mapping a static entry in mesa core to
  36  * a dynamic entry, or the corresponding static entry, in glapi.
  37  */
  38
  39 #include "remap.h"
  40 #include "imports.h"
  41 #include "glapi/glapi.h"
  42
  43 #if FEATURE_remap_table
  44
  45
  46 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
  47 #define MAX_ENTRY_POINTS 16
  48
  49 static const char *_mesa_function_pool;
  50
  51 /**
  52  * Return the spec string associated with the given function index.
  53  * The index is available from including remap_helper.h.
  54  *
  55  * \param func_index an opaque function index.
  56  *
  57  * \return the spec string associated with the function index, or NULL.
  58  */
  59 const char *
  60 _mesa_get_function_spec(GLint func_index)
  61 {
  62    return _mesa_function_pool + func_index;
  63 }
  64
  65
  66 /**
  67  * Map a function by its spec.  The function will be added to glapi,
  68  * and the dispatch offset will be returned.
  69  *
  70  * \param spec a '\0'-separated string array specifying a function.
  71  *        It begins with the parameter signature of the function,
  72  *        followed by the names of the entry points.  An empty entry
  73  *        point name terminates the array.
  74  *
  75  * \return the offset of the (re-)mapped function in the dispatch
  76  *         table, or -1.
  77  */
  78 GLint
  79 _mesa_map_function_spec(const char *spec)
  80 {
  81    const char *signature;
  82    const char *names[MAX_ENTRY_POINTS + 1];
  83    GLint num_names = 0;
  84
  85    if (!spec)
  86       return -1;
  87
  88    signature = spec;
  89    spec += strlen(spec) + 1;
  90
  91    /* spec is terminated by an empty string */
  92    while (*spec) {
  93       names[num_names] = spec;
  94       num_names++;
  95       if (num_names >= MAX_ENTRY_POINTS)
  96          break;
  97       spec += strlen(spec) + 1;
  98    }
  99    if (!num_names)
 100       return -1;
 101
 102    names[num_names] = NULL;
 103
 104    /* add the entry points to the dispatch table */
 105    return _glapi_add_dispatch(names, signature);
 106 }
 107
 108
 109 /**
 110  * Map an array of functions.  This is a convenient function for
 111  * use with arrays available from including remap_helper.h.
 112  *
 113  * Note that the dispatch offsets of the functions are not returned.
 114  * If they are needed, _mesa_map_function_spec() should be used.
 115  *
 116  * \param func_array an array of function remaps.
 117  */
 118 void
 119 _mesa_map_function_array(const struct gl_function_remap *func_array)
 120 {
 121    GLint i;
 122
 123    if (!func_array)
 124       return;
 125
 126    for (i = 0; func_array[i].func_index != -1; i++) {
 127       const char *spec;
 128       GLint offset;
 129
 130       spec = _mesa_get_function_spec(func_array[i].func_index);
 131       if (!spec) {
 132          _mesa_problem(NULL, "invalid function index %d",
 133                        func_array[i].func_index);
 134          continue;
 135       }
 136
 137       offset = _mesa_map_function_spec(spec);
 138       /* error checks */
 139       if (offset < 0) {
 140          const char *name = spec + strlen(spec) + 1;
 141          _mesa_warning(NULL, "failed to remap %s", name);
 142       }
 143       else if (func_array[i].dispatch_offset >= 0 &&
 144                offset != func_array[i].dispatch_offset) {
 145          const char *name = spec + strlen(spec) + 1;
 146          _mesa_problem(NULL, "%s should be mapped to %d, not %d",
 147                        name, func_array[i].dispatch_offset, offset);
 148       }
 149    }
 150 }
 151
 152
 153 /**
 154  * Initialize the remap table.  This is called in one_time_init().
 155  * The remap table needs to be initialized before calling the
 156  * CALL/GET/SET macros defined in main/dispatch.h.
 157  */
 158 void
 159 _mesa_do_init_remap_table(const char *pool,
 160                           int size,
 161                           const struct gl_function_pool_remap *remap)
 162 {
 163    static GLboolean initialized = GL_FALSE;
 164    GLint i;
 165
 166    if (initialized)
 167       return;
 168    initialized = GL_TRUE;
 169    _mesa_function_pool = pool;
 170
 171    /* initialize the remap table */
 172    for (i = 0; i < size; i++) {
 173       GLint offset;
 174       const char *spec;
 175
 176       /* sanity check */
 177       ASSERT(i == remap[i].remap_index);
 178       spec = _mesa_function_pool + remap[i].pool_index;
 179
 180       offset = _mesa_map_function_spec(spec);
 181       /* store the dispatch offset in the remap table */
 182       driDispatchRemapTable[i] = offset;
 183       if (offset < 0)
 184          _mesa_warning(NULL, "failed to remap index %d", i);
 185    }
 186 }
 187
 188
 189 #endif /* FEATURE_remap_table */