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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/* Authors: Zack Rusin <zack@tungstengraphics.com>
*/
#include "cso_cache.h"
#include "cso_hash.h"
#if 1
static unsigned hash_key(const void *key, unsigned key_size)
{
unsigned *ikey = (unsigned *)key;
unsigned hash = 0, i;
assert(key_size % 4 == 0);
/* I'm sure this can be improved on:
*/
for (i = 0; i < key_size/4; i++)
hash ^= ikey[i];
return hash;
}
#else
static unsigned hash_key(const unsigned char *p, int n)
{
unsigned h = 0;
unsigned g;
while (n--) {
h = (h << 4) + *p++;
if ((g = (h & 0xf0000000)) != 0)
h ^= g >> 23;
h &= ~g;
}
return h;
}
#endif
unsigned cso_construct_key(void *item, int item_size)
{
return hash_key((item), item_size);
}
static struct cso_hash *_cso_hash_for_type(struct cso_cache *sc, enum cso_cache_type type)
{
struct cso_hash *hash = 0;
switch(type) {
case CSO_BLEND:
hash = sc->blend_hash;
case CSO_SAMPLER:
hash = sc->sampler_hash;
case CSO_DEPTH_STENCIL:
hash = sc->depth_stencil_hash;
}
return hash;
}
static int _cso_size_for_type(enum cso_cache_type type)
{
switch(type) {
case CSO_BLEND:
return sizeof(struct pipe_blend_state);
case CSO_SAMPLER:
return sizeof(struct pipe_sampler_state);
case CSO_DEPTH_STENCIL:
return sizeof(struct pipe_depth_stencil_state);
}
return 0;
}
struct cso_hash_iter
cso_insert_state(struct cso_cache *sc,
unsigned hash_key, enum cso_cache_type type,
void *state)
{
struct cso_hash *hash = _cso_hash_for_type(sc, type);
return cso_hash_insert(hash, hash_key, state);
}
struct cso_hash_iter
cso_find_state(struct cso_cache *sc,
unsigned hash_key, enum cso_cache_type type)
{
struct cso_hash *hash = _cso_hash_for_type(sc, type);
return cso_hash_find(hash, hash_key);
}
struct cso_hash_iter cso_find_state_template(struct cso_cache *sc,
unsigned hash_key, enum cso_cache_type type,
void *templ)
{
struct cso_hash_iter iter = cso_find_state(sc, hash_key, type);
int size = _cso_size_for_type(type);
while (!cso_hash_iter_is_null(iter)) {
void *iter_data = cso_hash_iter_data(iter);
if (!memcmp(iter_data, templ, size))
return iter;
iter = cso_hash_iter_next(iter);
}
return iter;
}
void * cso_take_state(struct cso_cache *sc,
unsigned hash_key, enum cso_cache_type type)
{
struct cso_hash *hash = _cso_hash_for_type(sc, type);
return cso_hash_take(hash, hash_key);
}
struct cso_cache *cso_cache_create(void)
{
struct cso_cache *sc = malloc(sizeof(struct cso_cache));
sc->blend_hash = cso_hash_create();
sc->sampler_hash = cso_hash_create();
sc->depth_stencil_hash = cso_hash_create();
return sc;
}
void cso_cache_delete(struct cso_cache *sc)
{
assert(sc);
cso_hash_delete(sc->blend_hash);
cso_hash_delete(sc->sampler_hash);
cso_hash_delete(sc->depth_stencil_hash);
free(sc);
}
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