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/*
** SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
** Copyright (C) [dates of first publication] Silicon Graphics, Inc.
** 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, sublicense, 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 including the dates of first publication and either this
** permission notice or a reference to http://oss.sgi.com/projects/FreeB/ 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 NONINFRINGEMENT. IN NO EVENT SHALL SILICON GRAPHICS, INC.
** 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.
**
** Except as contained in this notice, the name of Silicon Graphics, Inc. shall not
** be used in advertising or otherwise to promote the sale, use or other dealings in
** this Software without prior written authorization from Silicon Graphics, Inc.
*/
/*
** Author: Mikko Mononen, July 2009.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <stdio.h>
#include <stdlib.h>
#include <libtess2/tesselator.h>
//#define CHECK_BOUNDS
typedef struct BucketAlloc BucketAlloc;
typedef struct Bucket Bucket;
struct Bucket
{
Bucket *next;
};
struct BucketAlloc
{
void *freelist;
Bucket *buckets;
unsigned int itemSize;
unsigned int bucketSize;
const char *name;
TESSalloc* alloc;
};
static int CreateBucket( struct BucketAlloc* ba )
{
unsigned int size;
Bucket* bucket;
void* freelist;
unsigned char* head;
unsigned char* it;
// Allocate memory for the bucket
size = sizeof(Bucket) + ba->itemSize * ba->bucketSize;
bucket = (Bucket*)ba->alloc->memalloc( ba->alloc->userData, size );
if ( !bucket )
return 0;
bucket->next = 0;
// Add the bucket into the list of buckets.
bucket->next = ba->buckets;
ba->buckets = bucket;
// Add new items to the free list.
freelist = ba->freelist;
head = (unsigned char*)bucket + sizeof(Bucket);
it = head + ba->itemSize * ba->bucketSize;
do
{
it -= ba->itemSize;
// Store pointer to next free item.
*((void**)it) = freelist;
// Pointer to next location containing a free item.
freelist = (void*)it;
}
while ( it != head );
// Update pointer to next location containing a free item.
ba->freelist = (void*)it;
return 1;
}
static void *NextFreeItem( struct BucketAlloc *ba )
{
return *(void**)ba->freelist;
}
struct BucketAlloc* createBucketAlloc( TESSalloc* alloc, const char* name,
unsigned int itemSize, unsigned int bucketSize )
{
BucketAlloc* ba = (BucketAlloc*)alloc->memalloc( alloc->userData, sizeof(BucketAlloc) );
ba->alloc = alloc;
ba->name = name;
ba->itemSize = itemSize;
if ( ba->itemSize < sizeof(void*) )
ba->itemSize = sizeof(void*);
ba->bucketSize = bucketSize;
ba->freelist = 0;
ba->buckets = 0;
if ( !CreateBucket( ba ) )
{
alloc->memfree( alloc->userData, ba );
return 0;
}
return ba;
}
void* bucketAlloc( struct BucketAlloc *ba )
{
void *it;
// If running out of memory, allocate new bucket and update the freelist.
if ( !ba->freelist || !NextFreeItem( ba ) )
{
if ( !CreateBucket( ba ) )
return 0;
}
// Pop item from in front of the free list.
it = ba->freelist;
ba->freelist = NextFreeItem( ba );
return it;
}
void bucketFree( struct BucketAlloc *ba, void *ptr )
{
#ifdef CHECK_BOUNDS
int inBounds = 0;
Bucket *bucket;
// Check that the pointer is allocated with this allocator.
bucket = ba->buckets;
while ( bucket )
{
void *bucketMin = (void*)((unsigned char*)bucket + sizeof(Bucket));
void *bucketMax = (void*)((unsigned char*)bucket + sizeof(Bucket) + ba->itemSize * ba->bucketSize);
if ( ptr >= bucketMin && ptr < bucketMax )
{
inBounds = 1;
break;
}
bucket = bucket->next;
}
if ( inBounds )
{
// Add the node in front of the free list.
*(void**)ptr = ba->freelist;
ba->freelist = ptr;
}
else
{
printf("ERROR! pointer 0x%p does not belong to allocator '%s'\n", ba->name);
}
#else
// Add the node in front of the free list.
*(void**)ptr = ba->freelist;
ba->freelist = ptr;
#endif
}
void deleteBucketAlloc( struct BucketAlloc *ba )
{
TESSalloc* alloc = ba->alloc;
Bucket *bucket = ba->buckets;
Bucket *next;
while ( bucket )
{
next = bucket->next;
alloc->memfree( alloc->userData, bucket );
bucket = next;
}
ba->freelist = 0;
ba->buckets = 0;
alloc->memfree( alloc->userData, ba );
}
#ifdef __cplusplus
}
#endif
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