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https://git.code.sf.net/p/quake/quakeforge
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145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/*
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zone.h
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(description)
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifndef __zone_h
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#define __zone_h
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/** \defgroup zone Memory Management
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\ingroup utils
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H_??? The hunk manages the entire memory block given to quake. It must be
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contiguous. Memory can be allocated from either the low or high end in a
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stack fashion. The only way memory is released is by resetting one of the
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pointers.
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Hunk allocations should be given a name, so the Hunk_Print () function
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can display usage.
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Hunk allocations are guaranteed to be 16 byte aligned.
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The video buffers are allocated high to avoid leaving a hole underneath
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server allocations when changing to a higher video mode.
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Z_??? Zone memory functions used for small, dynamic allocations like text
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strings from command input. There is only about 48K for it, allocated at
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the very bottom of the hunk.
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Cache_??? Cache memory is for objects that can be dynamically loaded and
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can usefully stay persistant between levels. The size of the cache
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fluctuates from level to level.
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To allocate a cachable object
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Temp_??? Temp memory is used for file loading and surface caching. The
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size of the cache memory is adjusted so that there is a minimum of 512k
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remaining for temp memory.
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------ Top of Memory -------
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high hunk allocations
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<--- high hunk reset point held by vid
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video buffer
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z buffer
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surface cache
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<--- high hunk used
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cachable memory
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<--- low hunk used
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client and server low hunk allocations
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<-- low hunk reset point held by host
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startup hunk allocations
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Zone block
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----- Bottom of Memory -----
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*/
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//@{
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typedef struct memzone_s memzone_t;
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void Memory_Init (void *buf, int size);
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void Z_ClearZone (memzone_t *zone, int size);
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void Z_Free (memzone_t *zone, void *ptr);
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void *Z_Malloc (memzone_t *zone, int size); // returns 0 filled memory
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void *Z_TagMalloc (memzone_t *zone, int size, int tag);
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void *Z_Realloc (memzone_t *zone, void *ptr, int size);
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void Z_Print (memzone_t *zone);
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void Z_CheckHeap (memzone_t *zone);
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void *Hunk_Alloc (int size); // returns 0 filled memory
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void *Hunk_AllocName (int size, const char *name);
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int Hunk_LowMark (void);
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void Hunk_FreeToLowMark (int mark);
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void *Hunk_TempAlloc (int size);
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void Hunk_Check (void);
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struct cache_user_s;
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typedef void *(*cache_allocator_t) (struct cache_user_s *c, int size, const char *name);
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typedef void (*cache_loader_t) (void *object, cache_allocator_t allocator);
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typedef struct cache_user_s {
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void *data;
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void *object;
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cache_loader_t loader;
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} cache_user_t;
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void Cache_Flush (void);
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void *Cache_Check (cache_user_t *c);
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// returns the cached data, and moves to the head of the LRU list
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// if present, otherwise returns NULL
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void Cache_Free (cache_user_t *c);
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void *Cache_Alloc (cache_user_t *c, int size, const char *name);
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// Returns NULL if all purgable data was tossed and there still
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// wasn't enough room.
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void Cache_Report (void);
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void Cache_Add (cache_user_t *c, void *object, cache_loader_t loader);
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void Cache_Remove (cache_user_t *c);
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void *Cache_TryGet (cache_user_t *c);
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void *Cache_Get (cache_user_t *c);
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void Cache_Release (cache_user_t *c);
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int Cache_ReadLock (cache_user_t *c);
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//@}
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#endif // __zone_h
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