mirror of
https://github.com/JGRennison/OpenTTD-patches.git
synced 2024-11-17 21:25:40 +00:00
97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/* $Id$ */
|
|
|
|
#ifndef POOL_H
|
|
#define POOL_H
|
|
|
|
typedef struct MemoryPool MemoryPool;
|
|
|
|
/* The function that is called after a new block is added
|
|
start_item is the first item of the new made block */
|
|
typedef void MemoryPoolNewBlock(uint start_item);
|
|
/* The function that is called before a block is cleaned up */
|
|
typedef void MemoryPoolCleanBlock(uint start_item, uint end_item);
|
|
|
|
/**
|
|
* Stuff for dynamic vehicles. Use the wrappers to access the MemoryPool
|
|
* please try to avoid manual calls!
|
|
*/
|
|
struct MemoryPool {
|
|
const char* const name; ///< Name of the pool (just for debugging)
|
|
|
|
const uint max_blocks; ///< The max amount of blocks this pool can have
|
|
const uint block_size_bits; ///< The size of each block in bits
|
|
const uint item_size; ///< How many bytes one block is
|
|
|
|
/// Pointer to a function that is called after a new block is added
|
|
MemoryPoolNewBlock *new_block_proc;
|
|
/// Pointer to a function that is called to clean a block
|
|
MemoryPoolCleanBlock *clean_block_proc;
|
|
|
|
uint current_blocks; ///< How many blocks we have in our pool
|
|
uint total_items; ///< How many items we now have in this pool
|
|
|
|
byte **blocks; ///< An array of blocks (one block hold all the items)
|
|
};
|
|
|
|
/**
|
|
* Those are the wrappers:
|
|
* CleanPool cleans the pool up, but you can use AddBlockToPool directly again
|
|
* (no need to call CreatePool!)
|
|
* AddBlockToPool adds 1 more block to the pool. Returns false if there is no
|
|
* more room
|
|
*/
|
|
void CleanPool(MemoryPool *array);
|
|
bool AddBlockToPool(MemoryPool *array);
|
|
|
|
/**
|
|
* Adds blocks to the pool if needed (and possible) till index fits inside the pool
|
|
*
|
|
* @return Returns false if adding failed
|
|
*/
|
|
bool AddBlockIfNeeded(MemoryPool *array, uint index);
|
|
|
|
|
|
#define POOL_ENUM(name, type, block_size_bits, max_blocks) \
|
|
enum { \
|
|
name##_POOL_BLOCK_SIZE_BITS = block_size_bits, \
|
|
name##_POOL_MAX_BLOCKS = max_blocks \
|
|
};
|
|
|
|
|
|
#define POOL_ACCESSORS(name, type) \
|
|
static inline type* Get##name(uint index) \
|
|
{ \
|
|
assert(index < _##name##_pool.total_items); \
|
|
return (type*)( \
|
|
_##name##_pool.blocks[index >> name##_POOL_BLOCK_SIZE_BITS] + \
|
|
(index & ((1 << name##_POOL_BLOCK_SIZE_BITS) - 1)) * sizeof(type) \
|
|
); \
|
|
} \
|
|
\
|
|
static inline uint Get##name##PoolSize(void) \
|
|
{ \
|
|
return _##name##_pool.total_items; \
|
|
}
|
|
|
|
|
|
#define DECLARE_POOL(name, type, block_size_bits, max_blocks) \
|
|
POOL_ENUM(name, type, block_size_bits, max_blocks) \
|
|
extern MemoryPool _##name##_pool; \
|
|
POOL_ACCESSORS(name, type)
|
|
|
|
|
|
#define DEFINE_POOL(name, type, new_block_proc, clean_block_proc) \
|
|
MemoryPool _##name##_pool = { \
|
|
#name, name##_POOL_MAX_BLOCKS, name##_POOL_BLOCK_SIZE_BITS, sizeof(type), \
|
|
new_block_proc, clean_block_proc, \
|
|
0, 0, NULL \
|
|
};
|
|
|
|
|
|
#define STATIC_POOL(name, type, block_size_bits, max_blocks, new_block_proc, clean_block_proc) \
|
|
POOL_ENUM(name, type, block_size_bits, max_blocks) \
|
|
static DEFINE_POOL(name, type, new_block_proc, clean_block_proc) \
|
|
POOL_ACCESSORS(name, type)
|
|
|
|
#endif /* POOL_H */
|