Ejemplo n.º 1
0
Archivo: remap.c Proyecto: airlied/mesa
/**
 * Map a function by its spec.  The function will be added to glapi,
 * and the dispatch offset will be returned.
 *
 * \param spec a '\0'-separated string array specifying a function.
 *        It begins with the parameter signature of the function,
 *        followed by the names of the entry points.  An empty entry
 *        point name terminates the array.
 *
 * \return the offset of the (re-)mapped function in the dispatch
 *         table, or -1.
 */
static int
map_function_spec(const char *spec)
{
   const char *signature;
   const char *names[MAX_ENTRY_POINTS + 1];
   int num_names = 0;

   if (!spec)
      return -1;

   signature = spec;
   spec += strlen(spec) + 1;

   /* spec is terminated by an empty string */
   while (*spec) {
      names[num_names] = spec;
      num_names++;
      if (num_names >= MAX_ENTRY_POINTS)
         break;
      spec += strlen(spec) + 1;
   }
   if (!num_names)
      return -1;

   names[num_names] = NULL;

   /* add the entry points to the dispatch table */
   return _glapi_add_dispatch(names, signature);
}
Ejemplo n.º 2
0
/**
 * Enable and add dispatch functions for a single extension
 * 
 * \param ctx  Context where extension is to be enabled.
 * \param ext  Extension that is to be enabled.
 * 
 * \sa driInitExtensions, _mesa_enable_extension, _glapi_add_entrypoint
 *
 * \todo
 * Determine if it would be better to use \c strlen instead of the hardcoded
 * for-loops.
 */
void driInitSingleExtension( GLcontext * ctx,
			     const struct dri_extension * ext )
{
    unsigned i;


    if ( ext->functions != NULL ) {
	for ( i = 0 ; ext->functions[i].strings != NULL ; i++ ) {
	    const char * functions[16];
	    const char * parameter_signature;
	    const char * str = ext->functions[i].strings;
	    unsigned j;
	    unsigned offset;


	    /* Separate the parameter signature from the rest of the string.
	     * If the parameter signature is empty (i.e., the string starts
	     * with a NUL character), then the function has a void parameter
	     * list.
	     */
	    parameter_signature = str;
	    while ( str[0] != '\0' ) {
		str++;
	    }
	    str++;


	    /* Divide the string into the substrings that name each
	     * entry-point for the function.
	     */
	    for ( j = 0 ; j < 16 ; j++ ) {
		if ( str[0] == '\0' ) {
		    functions[j] = NULL;
		    break;
		}

		functions[j] = str;

		while ( str[0] != '\0' ) {
		    str++;
		}
		str++;
	    }


	    /* Add each entry-point to the dispatch table.
	     */
	    offset = _glapi_add_dispatch( functions, parameter_signature );
	    if (offset == -1) {
#if 0 /* this causes noise with egl */
		fprintf(stderr, "DISPATCH ERROR! _glapi_add_dispatch failed "
			"to add %s!\n", functions[0]);
#endif
	    }
	    else if (ext->functions[i].remap_index != -1) {
		driDispatchRemapTable[ ext->functions[i].remap_index ] = 
		  offset;
	    }
	    else if (ext->functions[i].offset != offset) {
		fprintf(stderr, "DISPATCH ERROR! %s -> %u != %u\n",
			functions[0], offset, ext->functions[i].offset);
	    }
	}
    }

    if ( ctx != NULL ) {
	_mesa_enable_extension( ctx, ext->name );
    }
}