src/gallium/aux/cso_cache/cso_cache.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /* Authors:  Zack Rusin <zack@tungstengraphics.com>
  29  */
  30
  31 #include "cso_cache.h"
  32 #include "cso_hash.h"
  33
  34 #if 1
  35 static unsigned hash_key(const void *key, unsigned key_size)
  36 {
  37    unsigned *ikey = (unsigned *)key;
  38    unsigned hash = 0, i;
  39
  40    assert(key_size % 4 == 0);
  41
  42    /* I'm sure this can be improved on:
  43     */
  44    for (i = 0; i < key_size/4; i++)
  45       hash ^= ikey[i];
  46
  47    return hash;
  48 }
  49 #else
  50 static unsigned hash_key(const unsigned char *p, int n)
  51 {
  52    unsigned h = 0;
  53    unsigned g;
  54
  55    while (n--) {
  56       h = (h << 4) + *p++;
  57       if ((g = (h & 0xf0000000)) != 0)
  58          h ^= g >> 23;
  59       h &= ~g;
  60    }
  61    return h;
  62 }
  63 #endif
  64
  65 unsigned cso_construct_key(void *item, int item_size)
  66 {
  67    return hash_key((item), item_size);
  68 }
  69
  70 static struct cso_hash *_cso_hash_for_type(struct cso_cache *sc, enum cso_cache_type type)
  71 {
  72    struct cso_hash *hash = 0;
  73
  74    switch(type) {
  75    case CSO_BLEND:
  76       hash = sc->blend_hash;
  77       break;
  78    case CSO_SAMPLER:
  79       hash = sc->sampler_hash;
  80       break;
  81    case CSO_DEPTH_STENCIL_ALPHA:
  82       hash = sc->depth_stencil_hash;
  83       break;
  84    case CSO_RASTERIZER:
  85       hash = sc->rasterizer_hash;
  86       break;
  87    case CSO_FRAGMENT_SHADER:
  88       hash = sc->fs_hash;
  89       break;
  90    case CSO_VERTEX_SHADER:
  91       hash = sc->vs_hash;
  92       break;
  93    }
  94
  95    return hash;
  96 }
  97
  98 static int _cso_size_for_type(enum cso_cache_type type)
  99 {
 100    switch(type) {
 101    case CSO_BLEND:
 102       return sizeof(struct pipe_blend_state);
 103    case CSO_SAMPLER:
 104       return sizeof(struct pipe_sampler_state);
 105    case CSO_DEPTH_STENCIL_ALPHA:
 106       return sizeof(struct pipe_depth_stencil_alpha_state);
 107    case CSO_RASTERIZER:
 108       return sizeof(struct pipe_rasterizer_state);
 109    case CSO_FRAGMENT_SHADER:
 110       return sizeof(struct pipe_shader_state);
 111    case CSO_VERTEX_SHADER:
 112       return sizeof(struct pipe_shader_state);
 113    }
 114    return 0;
 115 }
 116
 117 struct cso_hash_iter
 118 cso_insert_state(struct cso_cache *sc,
 119                  unsigned hash_key, enum cso_cache_type type,
 120                  void *state)
 121 {
 122    struct cso_hash *hash = _cso_hash_for_type(sc, type);
 123    return cso_hash_insert(hash, hash_key, state);
 124 }
 125
 126 struct cso_hash_iter
 127 cso_find_state(struct cso_cache *sc,
 128                unsigned hash_key, enum cso_cache_type type)
 129 {
 130    struct cso_hash *hash = _cso_hash_for_type(sc, type);
 131
 132    return cso_hash_find(hash, hash_key);
 133 }
 134
 135 struct cso_hash_iter cso_find_state_template(struct cso_cache *sc,
 136                                              unsigned hash_key, enum cso_cache_type type,
 137                                              void *templ)
 138 {
 139    struct cso_hash_iter iter = cso_find_state(sc, hash_key, type);
 140    int size = _cso_size_for_type(type);
 141    while (!cso_hash_iter_is_null(iter)) {
 142       void *iter_data = cso_hash_iter_data(iter);
 143       if (!memcmp(iter_data, templ, size))
 144          return iter;
 145       iter = cso_hash_iter_next(iter);
 146    }
 147    return iter;
 148 }
 149
 150 void * cso_take_state(struct cso_cache *sc,
 151                       unsigned hash_key, enum cso_cache_type type)
 152 {
 153    struct cso_hash *hash = _cso_hash_for_type(sc, type);
 154    return cso_hash_take(hash, hash_key);
 155 }
 156
 157 struct cso_cache *cso_cache_create(void)
 158 {
 159    struct cso_cache *sc = malloc(sizeof(struct cso_cache));
 160
 161    sc->blend_hash         = cso_hash_create();
 162    sc->sampler_hash       = cso_hash_create();
 163    sc->depth_stencil_hash = cso_hash_create();
 164    sc->rasterizer_hash    = cso_hash_create();
 165    sc->fs_hash            = cso_hash_create();
 166    sc->vs_hash            = cso_hash_create();
 167
 168    return sc;
 169 }
 170
 171 void cso_cache_delete(struct cso_cache *sc)
 172 {
 173    assert(sc);
 174    cso_hash_delete(sc->blend_hash);
 175    cso_hash_delete(sc->sampler_hash);
 176    cso_hash_delete(sc->depth_stencil_hash);
 177    cso_hash_delete(sc->rasterizer_hash);
 178    cso_hash_delete(sc->fs_hash);
 179    cso_hash_delete(sc->vs_hash);
 180    free(sc);
 181 }