GU_SopResolver.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        GU_SopResolver.h ( GU Library, C++)
 *
 * COMMENTS:    Resolver class for resolving filenames like "op:/soppath"
 */

#ifndef __GU_SopResolver__
#define __GU_SopResolver__

#include "GU_API.h"
#include <SYS/SYS_Types.h>
#include <UT/UT_ValArray.h>
#include <UT/UT_String.h>
#include <UT/UT_StringMap.h>
#include <UT/UT_Matrix4.h>
#include <VEX/VEX_GeoInputs.h>
#include "GU_DetailHandle.h"

// Class to query an input on a VEX geometry
class GU_API GU_VexGeoInputs : public VEX_GeoInputs
{
public:
    GU_VexGeoInputs();
    virtual ~GU_VexGeoInputs();

    // You can register this class as a callback for when geo inputs
    // are destroyed.
    class GU_API ClearCB
    {
    public:
        ClearCB() {}
        virtual ~ClearCB() {}

        virtual void    clear() {}
    };

    /// When originally designed the idea was to allow delayed discovery
    /// of VEX inputs.  In practice this proves infeasible, so we mandate
    /// all inputs are cooked & stored prior to execution.  peekInput()
    /// and getInput() thus become equivalent.
    const GU_Detail *peekInput(int idx) const
    {
        return getInput(idx);
    }
    const GU_Detail *getInput(int idx) const
    {
        if (idx < minInputIdx() || idx > maxInputIdx())
            return 0;
        if (idx < 0)
            return myNegInputCache(-(idx+1));
        else
            return myPosInputCache(idx);
    }

    /// Does not gain ownership of gdp, the caller should keep
    /// it in scope until destruction
    void setInput(int idx, const GU_Detail *gdp)
    {
        if (idx < 0)
        {
            idx = - (idx + 1);
            myNegInputCache.forcedRef(idx) = gdp;
            myNegVexGeoCache.forcedRef(idx) = 0;
        }
        else
        {
            myPosInputCache.forcedRef(idx) = gdp;
            myPosVexGeoCache.forcedRef(idx) = 0;
        }
    }

    /// Adds a callback to be invoked when the GU_VexGeoInputs
    /// is destroyed.
    void addClearCB(ClearCB *cb)
    {
        myClearCBList.append(cb);
    }

    /// The GVEX layer stores the cache for the input in these structures,
    /// this ensures each invocation of VEX will have its own
    /// cache.  The GU_VexGeoInputs should thus be shared across threads
    /// to ensure separate threads use the same cache (so point clouds
    /// are not built twice, etc)
    void                *getVexCache(int idx) const
    {
        if (idx < minInputIdx() || idx > maxInputIdx())
            return 0;
        if (idx < 0)
            return myNegVexGeoCache(-(idx+1));
        else
            return myPosVexGeoCache(idx);
    }

    void                *getVexCache(const UT_StringRef &key) const
    {
        auto it = myVexGeoCacheMap.find(key);

        if( it == myVexGeoCacheMap.end() )
            return NULL;

        return it->second;
    }
    void                 setVexCache(int idx, void *cache)
    {
        UT_ASSERT(idx >= minInputIdx() && idx <= maxInputIdx());
        {
            // Must either be clearing or setting the first time,
            // setting an already set cache suggests this was not
            // properly locked by the caller.
            if (idx < 0)
            {
                idx = - (idx + 1);
                UT_ASSERT(!myNegVexGeoCache(idx) || !cache);
                myNegVexGeoCache(idx) = cache;
            }
            else
            {
                UT_ASSERT(!myPosVexGeoCache(idx) || !cache);
                myPosVexGeoCache(idx) = cache;
            }
        }
    }

    void                 setVexCache(const UT_StringRef &key, void *cache)
    {
        // Must either be clearing or setting the first time,
        // setting an already set cache suggests this was not
        // properly locked by the caller.
        UT_ASSERT(!myVexGeoCacheMap.contains(key) || !cache );
        myVexGeoCacheMap.insert( std::make_pair(key,cache ) );
    }


    /// Valid ranges are inclusive from minInputIdx to maXInputIdx.
    /// Note this can be negative!
    exint                minInputIdx() const { return - myNegInputCache.entries(); }
    exint                maxInputIdx() const { return myPosInputCache.entries() - 1; }

protected:
    // We do not own these, they are assumed to be owned
    // by the entity invoking setInput.
    mutable UT_Array<const GU_Detail *> myPosInputCache;
    mutable UT_Array<const GU_Detail *> myNegInputCache;
    mutable UT_Array<void *> myPosVexGeoCache;
    mutable UT_Array<void *> myNegVexGeoCache;
    mutable UT_StringMap<void*>  myVexGeoCacheMap;

    // We own this list of callback objects.
    UT_ValArray<ClearCB *>       myClearCBList;
};

// Class to query a SOP's detail for the resolver
class GU_API GU_SopQuery
{
public:
     GU_SopQuery()
     {
         myOpId = -1;
         myFrameSpecified = false;
         myTimeSpecified = false;
         myIsDopData = false;
         myXform.identity();
     }
     // If a detail has been locked, then it will be unlocked automatically on
     // destruction.
    ~GU_SopQuery() { clear(); }

    void                 clear();
    void                 clearButLeaveTime();

    void                 setDetail(const GU_ConstDetailHandle &handle)
                             { myDetail = handle; 
                               myDetail.addPreserveRequest();
                             }
    void                 setXform(const UT_Matrix4D &xform)
                             { myXform = xform; }

    GU_ConstDetailHandle &getDetail(const char *fullpath, int relative_to=-1);
    void                 getWorldTransform(UT_Matrix4D &xform,
                                const char *fullpath, int relative_to=-1);
    int                  getOpId() const        { return myOpId; }
    bool                 getFlagInterest() const{ return myFlagInterest; }
    int                  getSourceId() const    { return mySourceOpId; }
    bool                 isDopData() const { return myIsDopData; }
    void                 setIsDopData(bool isdop) { myIsDopData = isdop; }
    void                 addDopReference(int callerid);
    bool                 getFrame(fpreal &frame) const
                         {
                             if (myFrameSpecified)
                                 frame = myFrame;
                             return myFrameSpecified;
                         }

    void                 setFrame(fpreal frame)
                         {
                             myFrameSpecified = true;
                             myFrame = frame;
                         }
    
    bool                 getTime(fpreal &frame) const
                         {
                             if (myTimeSpecified)
                                 frame = myTime;
                             return myTimeSpecified;
                         }

    void                 setTime(fpreal frame)
                         {
                             myTimeSpecified = true;
                             myTime = frame;
                         }

    const UT_String     &getSubPath() const { return mySubPath; }

private:
    GU_ConstDetailHandle         myDetail;
    UT_Matrix4D          myXform;
    int                  myOpId;
    bool                 myFlagInterest;
    int                  mySourceOpId;
    bool                 myFrameSpecified;
    fpreal               myFrame;
    bool                 myTimeSpecified;
    fpreal               myTime;
    UT_String            mySubPath;
    bool                 myIsDopData;
    friend class         GU_SopResolver;
};

//
// Note:  The GU_SopResolver class shouldn't be accessed directly.  All access
// should be performed through the GU_SopQuery class.
//
class GU_API GU_SopResolver
{
public:
             GU_SopResolver();
    virtual ~GU_SopResolver();

    static void                  setResolver(GU_SopResolver *resolver);
    static GU_SopResolver       *getResolver();

    /// Stealing the resolver will give you a copy of the current resolver,
    /// clearing out ownership of the resolver.  The caller of @c stealResolver
    /// is responsible for deleting the stolen resolver.
    static GU_SopResolver       *stealResolver();

    // Lookup a path to see if it's a path to something that has geometry
    static bool                  lookup(const char *fullpath, GU_SopQuery &q);
    static bool                  lookupXform(const char *fullpath, GU_SopQuery &q);

    // Sub-class responsibilities:  These shouldn't be called directly.  They
    // are only public for the SopQuery class.

    // Given an operator path, return the unique ID associated with the Op.
    // Otherwise, return -1.
    virtual int                  resolveId(const char *fullpath,
                                            int relative_to, bool &flaginterest) = 0;

    // The resolveDetail method should set the handle in the query
    // appropriately.
    virtual bool                resolveDetail(GU_SopQuery &q) = 0;
    virtual bool                resolveXform(GU_SopQuery &q) = 0;

    virtual void                addDopReference(GU_SopQuery &q, int callerid) = 0;
};

#endif