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/*
*
* Copyright (C) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* 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 2.1 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.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*
*/
// -*- C++ -*-
/*
* Copyright (C) 1990,91 Silicon Graphics, Inc.
*
_______________________________________________________________________
______________ S I L I C O N G R A P H I C S I N C . ____________
|
| $Revision: 1.1.1.1 $
|
| Classes:
| SoCacheElement
|
| Author(s) : Paul S. Strauss, Gavin Bell
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SO_CACHE_ELEMENT_
#define _SO_CACHE_ELEMENT_
#include <Inventor/elements/SoSubElement.h>
class SoCache;
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoCacheElement
//
// Element that stores the most recently opened cache.
//
//////////////////////////////////////////////////////////////////////////////
SoEXTENDER class SoCacheElement : public SoElement {
SO_ELEMENT_HEADER(SoCacheElement);
public:
// Initializes element
virtual void init(SoState *state);
// Sets cache in element accessed from state
static void set(SoState *state, SoCache *cache);
// Returns the cache stored in an instance. This may be NULL.
SoCache * getCache() const { return cache; }
// Returns TRUE if any cache is currently open in the state
static SbBool anyOpen(SoState *state);
// Invalidate any open caches. This is called by nodes that
// should not be cached.
static void invalidate(SoState *state);
// Overrides this method to unref cache
virtual void pop(SoState *state, const SoElement *prevTopElement);
// Overrides this method to print an error message and return
// FALSE. Cache elements should never be compared, since they
// never appear in the elements-used list of caches!
virtual SbBool matches(const SoElement *elt) const;
// Copy method prints error and returns NULL; see comment above.
virtual SoElement *copyMatchInfo() const;
// Returns the next cache element in the stack
SoCacheElement * getNextCacheElement() const
{ return (SoCacheElement *) getNextInStack(); }
SoINTERNAL public:
// Initializes the SoCacheElement class
static void initClass();
// Adds the given element to the elements used lists of all
// currently open caches in the state
static void addElement(SoState *state, const SoElement *elt);
// Adds a dependency on the given cache to all currently open
// caches in the state
static void addCacheDependency(SoState *state, SoCache *cache);
// Sets invalidated bit, and returns its old value. Used by
// SoGLCacheList so auto-caching doesn't cache too much.
static SbBool setInvalid(SbBool newValue);
// returns the current cache, from the top of the stack. Does not
// cause a cache dependence like getConstElement().
static SoCache * getCurrentCache(SoState *state)
{return ((SoCacheElement*)(state->getElementNoPush(classStackIndex)))->cache;}
virtual ~SoCacheElement();
private:
SoCache *cache; // Stores pointer to cache
static SbBool invalidated; // invalidate() called?
friend class SoElement;
};
#endif /* _SO_CACHE_ELEMENT_ */
|
