src/gallium/state_trackers/vega/handle.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 VMware, Inc.  All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
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  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  **************************************************************************/
  26
  27
  28 #include "handle.h"
  29 #include "util/u_hash.h"
  30 #include "util/u_hash_table.h"
  31
  32
  33 /**
  34  * Hash keys are 32-bit VGHandles
  35  */
  36
  37 struct util_hash_table *handle_hash = NULL;
  38
  39
  40 static unsigned next_handle = 1;
  41
  42
  43 static unsigned
  44 hash_func(void *key)
  45 {
  46    /* XXX this kind of ugly */
  47    intptr_t ip = pointer_to_intptr(key);
  48    return (unsigned) (ip & 0xffffffff);
  49 }
  50
  51
  52 static int
  53 compare(void *key1, void *key2)
  54 {
  55    if (key1 < key2)
  56       return -1;
  57    else if (key1 > key2)
  58       return +1;
  59    else
  60       return 0;
  61 }
  62
  63
  64 void
  65 init_handles(void)
  66 {
  67    if (!handle_hash)
  68       handle_hash = util_hash_table_create(hash_func, compare);
  69 }
  70
  71
  72 void
  73 free_handles(void)
  74 {
  75    /* XXX destroy */
  76 }
  77
  78
  79 VGHandle
  80 create_handle(void *object)
  81 {
  82    VGHandle h = next_handle++;
  83    util_hash_table_set(handle_hash, intptr_to_pointer(h), object);
  84    return h;
  85 }
  86
  87
  88 void
  89 destroy_handle(VGHandle h)
  90 {
  91    util_hash_table_remove(handle_hash, intptr_to_pointer(h));
  92 }
  93