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 #if FEATURE_remap_table
  40
  41 #include "remap.h"
  42 #include "imports.h"
  43 #include "glapi/glapi.h"
  44
  45 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
  46 #define MAX_ENTRY_POINTS 16
  47
  48 static const char *_mesa_function_pool;
  49
  50 /**
  51  * Return the spec string associated with the given function index.
  52  * The index is available from including remap_helper.h.
  53  *
  54  * \param func_index an opaque function index.
  55  *
  56  * \return the spec string associated with the function index, or NULL.
  57  */
  58 const char *
  59 _mesa_get_function_spec(GLint func_index)
  60 {
  61    return _mesa_function_pool + func_index;
  62 }
  63
  64
  65 /**
  66  * Map a function by its spec.  The function will be added to glapi,
  67  * and the dispatch offset will be returned.
  68  *
  69  * \param spec a '\0'-separated string array specifying a function.
  70  *        It begins with the parameter signature of the function,
  71  *        followed by the names of the entry points.  An empty entry
  72  *        point name terminates the array.
  73  *
  74  * \return the offset of the (re-)mapped function in the dispatch
  75  *         table, or -1.
  76  */
  77 GLint
  78 _mesa_map_function_spec(const char *spec)
  79 {
  80    const char *signature;
  81    const char *names[MAX_ENTRY_POINTS + 1];
  82    GLint num_names = 0;
  83
  84    if (!spec)
  85       return -1;
  86
  87    signature = spec;
  88    spec += strlen(spec) + 1;
  89
  90    /* spec is terminated by an empty string */
  91    while (*spec) {
  92       names[num_names] = spec;
  93       num_names++;
  94       if (num_names >= MAX_ENTRY_POINTS)
  95          break;
  96       spec += strlen(spec) + 1;
  97    }
  98    if (!num_names)
  99       return -1;
 100
 101    names[num_names] = NULL;
 102
 103    /* add the entry points to the dispatch table */
 104    return _glapi_add_dispatch(names, signature);
 105 }
 106
 107
 108 /**
 109  * Map an array of functions.  This is a convenient function for
 110  * use with arrays available from including remap_helper.h.
 111  *
 112  * Note that the dispatch offsets of the functions are not returned.
 113  * If they are needed, _mesa_map_function_spec() should be used.
 114  *
 115  * \param func_array an array of function remaps.
 116  */
 117 void
 118 _mesa_map_function_array(const struct gl_function_remap *func_array)
 119 {
 120    GLint i;
 121
 122    if (!func_array)
 123       return;
 124
 125    for (i = 0; func_array[i].func_index != -1; i++) {
 126       const char *spec;
 127       GLint offset;
 128
 129       spec = _mesa_get_function_spec(func_array[i].func_index);
 130       if (!spec) {
 131          _mesa_problem(NULL, "invalid function index %d",
 132                        func_array[i].func_index);
 133          continue;
 134       }
 135
 136       offset = _mesa_map_function_spec(spec);
 137       /* error checks */
 138       if (offset < 0) {
 139          const char *name = spec + strlen(spec) + 1;
 140          _mesa_warning(NULL, "failed to remap %s", name);
 141       }
 142       else if (func_array[i].dispatch_offset >= 0 &&
 143                offset != func_array[i].dispatch_offset) {
 144          const char *name = spec + strlen(spec) + 1;
 145          _mesa_problem(NULL, "%s should be mapped to %d, not %d",
 146                        name, func_array[i].dispatch_offset, offset);
 147       }
 148    }
 149 }
 150
 151
 152 /**
 153  * Initialize the remap table.  This is called in one_time_init().
 154  * The remap table needs to be initialized before calling the
 155  * CALL/GET/SET macros defined in main/dispatch.h.
 156  */
 157 void
 158 _mesa_do_init_remap_table(const char *pool,
 159                           int size,
 160                           const struct gl_function_pool_remap *remap)
 161 {
 162    static GLboolean initialized = GL_FALSE;
 163    GLint i;
 164
 165    if (initialized)
 166       return;
 167    initialized = GL_TRUE;
 168    _mesa_function_pool = pool;
 169
 170    /* initialize the remap table */
 171    for (i = 0; i < size; i++) {
 172       GLint offset;
 173       const char *spec;
 174
 175       /* sanity check */
 176       ASSERT(i == remap[i].remap_index);
 177       spec = _mesa_function_pool + remap[i].pool_index;
 178
 179       offset = _mesa_map_function_spec(spec);
 180       /* store the dispatch offset in the remap table */
 181       driDispatchRemapTable[i] = offset;
 182       if (offset < 0)
 183          _mesa_warning(NULL, "failed to remap index %d", i);
 184    }
 185 }
 186
 187
 188 #endif /* FEATURE_remap_table */