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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2013 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-context-private.h"
#include "cogl-pipeline-private.h"
#include "cogl-pipeline-hash-table.h"
typedef struct
{
/* The template pipeline */
CoglPipeline *pipeline;
/* GHashTable annoyingly doesn't let us pass a user data pointer to
* the hash and equal functions so to work around it we have to
* store the pointer in every hash table entry. We will use this
* entry as both the key and the value */
CoglPipelineHashTable *hash;
} CoglPipelineHashTableEntry;
static void
value_destroy_cb (void *value)
{
CoglPipelineHashTableEntry *entry = value;
cogl_object_unref (entry->pipeline);
g_slice_free (CoglPipelineHashTableEntry, entry);
}
static unsigned int
entry_hash (const void *data)
{
const CoglPipelineHashTableEntry *entry = data;
const CoglPipelineHashTable *hash = entry->hash;
return _cogl_pipeline_hash (entry->pipeline,
hash->main_state,
hash->layer_state,
0);
}
static CoglBool
entry_equal (const void *a,
const void *b)
{
const CoglPipelineHashTableEntry *entry_a = a;
const CoglPipelineHashTableEntry *entry_b = b;
const CoglPipelineHashTable *hash = entry_a->hash;
return _cogl_pipeline_equal (entry_a->pipeline,
entry_b->pipeline,
hash->main_state,
hash->layer_state,
0);
}
void
_cogl_pipeline_hash_table_init (CoglPipelineHashTable *hash,
unsigned int main_state,
unsigned int layer_state,
const char *debug_string)
{
hash->n_unique_pipelines = 0;
hash->debug_string = debug_string;
hash->main_state = main_state;
hash->layer_state = layer_state;
hash->table = g_hash_table_new_full (entry_hash,
entry_equal,
NULL, /* key destroy */
value_destroy_cb);
}
void
_cogl_pipeline_hash_table_destroy (CoglPipelineHashTable *hash)
{
g_hash_table_destroy (hash->table);
}
CoglPipeline *
_cogl_pipeline_hash_table_get (CoglPipelineHashTable *hash,
CoglPipeline *key_pipeline)
{
CoglPipelineHashTableEntry dummy_entry;
CoglPipelineHashTableEntry *entry;
unsigned int copy_state;
dummy_entry.pipeline = key_pipeline;
dummy_entry.hash = hash;
entry = g_hash_table_lookup (hash->table, &dummy_entry);
if (entry)
return entry->pipeline;
if (hash->n_unique_pipelines == 50)
g_warning ("Over 50 separate %s have been generated which is very "
"unusual, so something is probably wrong!\n",
hash->debug_string);
/* XXX: I wish there was a way to insert into a GHashTable with a
* pre-calculated hash value since there is a cost to calculating
* the hash of a CoglPipeline and in this case we know we have
* already called _cogl_pipeline_hash during the lookup so we could
* pass the value through to here to avoid hashing it again.
*/
/* XXX: Any keys referenced by the hash table need to remain valid
* all the while that there are corresponding values, so for now we
* simply make a copy of the current authority pipeline.
*
* FIXME: A problem with this is that our key into the cache may
* hold references to some arbitrary user textures which will now be
* kept alive indefinitly which is a shame. A better solution will
* be to derive a special "key pipeline" from the authority which
* derives from the base Cogl pipeline (to avoid affecting the
* lifetime of any other pipelines) and only takes a copy of the
* state that relates to the fragment shader and references small
* dummy textures instead of potentially large user textures.
*/
entry = g_slice_new (CoglPipelineHashTableEntry);
entry->pipeline = cogl_pipeline_copy (key_pipeline);
entry->hash = hash;
g_hash_table_insert (hash->table, entry, entry);
hash->n_unique_pipelines++;
return entry->pipeline;
}
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