SoEngine.h

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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/
 *
 */
 
 
/*
 * 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 $
 |
 |   Description:
 |      This file defines the base SoEngine class, and the
 |      SoEngineOutput class.
 |
 |   Author(s)          : Gavin Bell
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
 
#ifndef  _SO_ENGINE_
#define  _SO_ENGINE_
 
#include <Inventor/fields/SoFieldContainer.h>
#include <Inventor/SoLists.h>
#include <Inventor/SbString.h>
#include <Inventor/SoType.h>
 
 
 
class SoFieldData;
class SoEngineList;
class SoEngineOutput;
class SoEngineOutputList;
class SoEngineOutputData;
class SoField;
class SoOutput;
class SoInput;
 
 
 
class INVENTOR_API SoEngine : public SoFieldContainer {
 
  public:
 
    static SoType       getClassTypeId() { return classTypeId; }
 
    virtual int         getOutputs(SoEngineOutputList &list) const;
 
    SoEngineOutput *    getOutput(const SbName &outputName) const;
 
    bool                getOutputName(const SoEngineOutput *output,
                                     SbName &outputName) const;
 
    SoEngine *          copy() const;
 
    static SoEngine *   getByName(const SbName &name);
    static int          getByName(const SbName &name, SoEngineList &list);
 
  protected:
 
    virtual void        evaluate() = 0;
 
  SoINTERNAL public:
 
    void                evaluateWrapper();
 
    virtual void        notify(SoNotList *list);
 
    static void         initClass();
 
    virtual const SoEngineOutputData *getOutputData() const = 0;
 
    static void         initClasses();
 
    virtual void        writeInstance(SoOutput *out);
 
    virtual SoFieldContainer *  copyThroughConnection() const;
 
    bool                shouldCopy() const;
 
    bool                isNotifying() const { return notifying; }
 
  protected:
 
    SoEngine();
    ~SoEngine();
 
    virtual bool        readInstance(SoInput *in, unsigned short flags);
 
    virtual void        inputChanged(SoField *whichField);
 
    static const SoFieldData            **getInputDataPtr()  { return NULL; }
    static const SoEngineOutputData     **getOutputDataPtr() { return NULL; }
 
    void                writeOutputTypes(SoOutput *out);
 
  private:
    static SoType       classTypeId;            
 
    bool                needsEvaluation;        
    bool                notifying;
friend class SoEngineOutput;
};
 
 
 
 
class INVENTOR_API SoEngineOutput {
 
  public:
 
    SoType              getConnectionType() const;
 
    int                 getForwardConnections(SoFieldList &list) const;
 
    void                enable(bool flag);
    bool                isEnabled() const       { return enabled; }
 
    SoEngine *          getContainer() const            { return container; }
 
  SoINTERNAL public:
    SoEngineOutput();
 
    virtual ~SoEngineOutput();
 
    void                setContainer(SoEngine *eng)     { container = eng; }
 
    void                addConnection(SoField *);
    void                removeConnection(SoField *);
 
    int                 getNumConnections() const
        { return connections.getLength(); }
 
    SoField *           operator[](int i) const
        { return connections.get(i); }
 
    void                prepareToWrite() const;
    void                doneWriting() const;
 
  private:
    bool                enabled;
    SoFieldList         connections;
    SoEngine            *container;
};
 
#endif /* _SO_ENGINE_ */