GA_AttributeRefMapOffsetMap.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:        GA_AttributeRefMapOffsetMap.h ( GA Library, C++)
 *
 * COMMENTS:    A mapping from a particular element to the corresponding
 *              elements in other index maps, updated on the fly.
 */

#ifndef __GA_AttributeRefMapOffsetMap__
#define __GA_AttributeRefMapOffsetMap__

#include "GA_API.h"
#include "GA_Attribute.h"
#include "GA_Detail.h"
#include "GA_Types.h"

#include <SYS/SYS_Types.h>


class GA_API GA_AttributeRefMapOffsetMap
{
private:
    GA_Offset           myOffsets[GA_ATTRIB_OWNER_N];
    GA_AttributeOwner   myOwner;

#if !defined(GA_STRICT_TYPES)
    static const GA_Offset      theNeedLookup = (GA_INVALID_OFFSET-1);
#else
    static const GA_Offset      theNeedLookup;
#endif

public:
    GA_AttributeRefMapOffsetMap(GA_AttributeOwner owner, GA_Offset off)
        : myOwner(owner)
    {
        for (int i = 0; i < GA_ATTRIB_OWNER_N; ++i)
            myOffsets[i] = theNeedLookup;
        myOffsets[owner] = off;
        myOffsets[GA_ATTRIB_DETAIL] = GA_Offset(0);
    }

    SYS_FORCE_INLINE void
        reset(GA_AttributeOwner owner, GA_Offset off)
        {
            for (int i = 0; i < GA_ATTRIB_OWNER_N; ++i)
                myOffsets[i] = theNeedLookup;
            myOffsets[owner] = off;
            myOffsets[GA_ATTRIB_DETAIL] = GA_Offset(0);
            myOwner = owner;
        }

    SYS_FORCE_INLINE GA_Offset
        getOwnerOffset() const { return myOffsets[myOwner]; }

    SYS_FORCE_INLINE GA_Offset 
        getOffset(const GA_Attribute *attrib)
    {
        GA_AttributeOwner aowner = attrib->getOwner();
        if (myOffsets[aowner] == theNeedLookup)
        {
            if (aowner == GA_ATTRIB_GLOBAL)
                return myOffsets[aowner] = GA_Offset(0);

            if (myOwner == GA_ATTRIB_VERTEX)
            {
                const GA_Detail &gdp = attrib->getDetail();
                if (aowner == GA_ATTRIB_POINT)
                    return myOffsets[aowner] = gdp.vertexPoint(
                                                            myOffsets[myOwner]);
                if (aowner == GA_ATTRIB_PRIMITIVE)
                    return myOffsets[aowner] = gdp.vertexPrimitive(
                                                            myOffsets[myOwner]);
            }

            return myOffsets[aowner] = GA_INVALID_OFFSET;
        }
    
        return myOffsets[aowner];
    }
};

#endif // __GA_AttributeRefMapOffsetMap__