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/* $XFree86$ */
/**************************************************************************
Copyright 1999, 2000 ATI Technologies Inc. and Precision Insight, 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
on 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
ATI, PRECISION INSIGHT AND/OR THEIR 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:
* Kevin E. Martin <kevin@precisioninsight.com>
*
*/
#ifndef _R128_SAREA_H_
#define _R128_SAREA_H_
/* There are 2 heaps (local/AGP). Each region within a heap is a
minimum of 64k, and there are at most 64 of them per heap. */
#define R128_LOCAL_TEX_HEAP 0
#define R128_AGP_TEX_HEAP 1
#define R128_NR_TEX_HEAPS 2
#define R128_NR_TEX_REGIONS 64
#define R128_LOG_TEX_GRANULARITY 16
typedef struct {
unsigned char next, prev; /* indices to form a circular LRU */
unsigned char in_use; /* owned by a client, or free? */
int age; /* tracked by clients to update local LRU's */
} R128TexRegion;
typedef struct {
/* Maintain an LRU of contiguous regions of texture space. If you
* think you own a region of texture memory, and it has an age
* different to the one you set, then you are mistaken and it has
* been stolen by another client. If global texAge hasn't changed,
* there is no need to walk the list.
*
* These regions can be used as a proxy for the fine-grained texture
* information of other clients - by maintaining them in the same
* lru which is used to age their own textures, clients have an
* approximate lru for the whole of global texture space, and can
* make informed decisions as to which areas to kick out. There is
* no need to choose whether to kick out your own texture or someone
* else's - simply eject them all in LRU order.
*/
/* Last elt is sentinal */
R128TexRegion texList[R128_NR_TEX_HEAPS][R128_NR_TEX_REGIONS+1];
/* last time texture was uploaded */
int texAge[R128_NR_TEX_HEAPS];
int ctxOwner; /* last context to upload state */
int ringWrite; /* current ring buffer write index */
} R128SAREAPriv, *R128SAREAPrivPtr;
#endif
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