src/gallium/auxiliary/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 "pipe/p_util.h"
  32
  33 #include "cso_cache.h"
  34 #include "cso_hash.h"
  35
  36 #if 1
  37 static unsigned hash_key(const void *key, unsigned key_size)
  38 {
  39    unsigned *ikey = (unsigned *)key;
  40    unsigned hash = 0, i;
  41
  42    assert(key_size % 4 == 0);
  43
  44    /* I'm sure this can be improved on:
  45     */
  46    for (i = 0; i < key_size/4; i++)
  47       hash ^= ikey[i];
  48
  49    return hash;
  50 }
  51 #else
  52 static unsigned hash_key(const unsigned char *p, int n)
  53 {
  54    unsigned h = 0;
  55    unsigned g;
  56
  57    while (n--) {
  58       h = (h << 4) + *p++;
  59       if ((g = (h & 0xf0000000)) != 0)
  60          h ^= g >> 23;
  61       h &= ~g;
  62    }
  63    return h;
  64 }
  65 #endif
  66
  67 unsigned cso_construct_key(void *item, int item_size)
  68 {
  69    return hash_key((item), item_size);
  70 }
  71
  72 static struct cso_hash *_cso_hash_for_type(struct cso_cache *sc, enum cso_cache_type type)
  73 {
  74    struct cso_hash *hash = 0;
  75
  76    switch(type) {
  77    case CSO_BLEND:
  78       hash = sc->blend_hash;
  79       break;
  80    case CSO_SAMPLER:
  81       hash = sc->sampler_hash;
  82       break;
  83    case CSO_DEPTH_STENCIL_ALPHA:
  84       hash = sc->depth_stencil_hash;
  85       break;
  86    case CSO_RASTERIZER:
  87       hash = sc->rasterizer_hash;
  88       break;
  89    case CSO_FRAGMENT_SHADER:
  90       hash = sc->fs_hash;
  91       break;
  92    case CSO_VERTEX_SHADER:
  93       hash = sc->vs_hash;
  94       break;
  95    }
  96
  97    return hash;
  98 }
  99
 100 static int _cso_size_for_type(enum cso_cache_type type)
 101 {
 102    switch(type) {
 103    case CSO_BLEND:
 104       return sizeof(struct pipe_blend_state);
 105    case CSO_SAMPLER:
 106       return sizeof(struct pipe_sampler_state);
 107    case CSO_DEPTH_STENCIL_ALPHA:
 108       return sizeof(struct pipe_depth_stencil_alpha_state);
 109    case CSO_RASTERIZER:
 110       return sizeof(struct pipe_rasterizer_state);
 111    case CSO_FRAGMENT_SHADER:
 112       return sizeof(struct pipe_shader_state);
 113    case CSO_VERTEX_SHADER:
 114       return sizeof(struct pipe_shader_state);
 115    }
 116    return 0;
 117 }
 118
 119 struct cso_hash_iter
 120 cso_insert_state(struct cso_cache *sc,
 121                  unsigned hash_key, enum cso_cache_type type,
 122                  void *state)
 123 {
 124    struct cso_hash *hash = _cso_hash_for_type(sc, type);
 125    return cso_hash_insert(hash, hash_key, state);
 126 }
 127
 128 struct cso_hash_iter
 129 cso_find_state(struct cso_cache *sc,
 130                unsigned hash_key, enum cso_cache_type type)
 131 {
 132    struct cso_hash *hash = _cso_hash_for_type(sc, type);
 133
 134    return cso_hash_find(hash, hash_key);
 135 }
 136
 137
 138 void *cso_hash_find_data_from_template( struct cso_hash *hash,
 139                                         unsigned hash_key,
 140                                         void *templ,
 141                                         int size )
 142 {
 143    struct cso_hash_iter iter = cso_hash_find(hash, hash_key);
 144    while (!cso_hash_iter_is_null(iter)) {
 145       void *iter_data = cso_hash_iter_data(iter);
 146       if (!memcmp(iter_data, templ, size)) {
 147          /* Return the payload:
 148           */
 149          return (unsigned char *)iter_data + size;
 150       }
 151       iter = cso_hash_iter_next(iter);
 152    }
 153    return NULL;
 154 }
 155
 156
 157 struct cso_hash_iter cso_find_state_template(struct cso_cache *sc,
 158                                              unsigned hash_key, enum cso_cache_type type,
 159                                              void *templ)
 160 {
 161    struct cso_hash_iter iter = cso_find_state(sc, hash_key, type);
 162    int size = _cso_size_for_type(type);
 163    while (!cso_hash_iter_is_null(iter)) {
 164       void *iter_data = cso_hash_iter_data(iter);
 165       if (!memcmp(iter_data, templ, size))
 166          return iter;
 167       iter = cso_hash_iter_next(iter);
 168    }
 169    return iter;
 170 }
 171
 172 void * cso_take_state(struct cso_cache *sc,
 173                       unsigned hash_key, enum cso_cache_type type)
 174 {
 175    struct cso_hash *hash = _cso_hash_for_type(sc, type);
 176    return cso_hash_take(hash, hash_key);
 177 }
 178
 179 struct cso_cache *cso_cache_create(void)
 180 {
 181    struct cso_cache *sc = MALLOC_STRUCT(cso_cache);
 182
 183    sc->blend_hash         = cso_hash_create();
 184    sc->sampler_hash       = cso_hash_create();
 185    sc->depth_stencil_hash = cso_hash_create();
 186    sc->rasterizer_hash    = cso_hash_create();
 187    sc->fs_hash            = cso_hash_create();
 188    sc->vs_hash            = cso_hash_create();
 189
 190    return sc;
 191 }
 192
 193 void cso_cache_delete(struct cso_cache *sc)
 194 {
 195    assert(sc);
 196    cso_hash_delete(sc->blend_hash);
 197    cso_hash_delete(sc->sampler_hash);
 198    cso_hash_delete(sc->depth_stencil_hash);
 199    cso_hash_delete(sc->rasterizer_hash);
 200    cso_hash_delete(sc->fs_hash);
 201    cso_hash_delete(sc->vs_hash);
 202    FREE(sc);
 203 }