SOP_TimeCompare.h

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/*
 * Copyright (c) 2024
 *      Side Effects Software Inc.  All rights reserved.
 *
 * Redistribution and use of Houdini Development Kit samples in source and
 * binary forms, with or without modification, are permitted provided that the
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 *    this list of conditions and the following disclaimer.
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 * THIS SOFTWARE IS PROVIDED BY SIDE EFFECTS SOFTWARE `AS IS' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL SIDE EFFECTS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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 *----------------------------------------------------------------------------
 * TimeCompare SOP
 */


#ifndef __SOP_TimeCompare_h__
#define __SOP_TimeCompare_h__

#include <SOP/SOP_Node.h>

namespace HDK_Sample {
/// Compares a point attribute on the two inputs at different times, storing
/// the difference in a new attribute.
class SOP_TimeCompare : public SOP_Node
{
public:
             SOP_TimeCompare(OP_Network *net, const char *name, OP_Operator *op);
            ~SOP_TimeCompare() override;

    static PRM_Template          myTemplateList[];
    static OP_Node              *myConstructor(OP_Network*, const char *,
                                                            OP_Operator *);

    /// This method is created so that it can be called by handles.  It only
    /// cooks the input group of this SOP.  The geometry in this group is
    /// the only geometry manipulated by this SOP.
    OP_ERROR                     cookInputGroups(OP_Context &context, 
                                                int alone = 0) override;

protected:
    /// Method to cook geometry for the SOP
    OP_ERROR                     cookMySop(OP_Context &context) override;

private:
    void        getGroups(UT_String &str){ evalString(str, "group", 0, 0); }

    void        ATTRIB(UT_String &str, fpreal t) 
                { evalString(str, "attrib", 0, t); }
    void        RESULTATTRIB(UT_String &str, fpreal t) 
                { evalString(str, "resultattrib", 0, t); }
    fpreal      FRAME(fpreal t)
                { return evalFloat("frame", 0, t); }

    /// This is the group of geometry to be manipulated by this SOP and cooked
    /// by the method "cookInputGroups".
    const GA_PointGroup *myGroup;
};
} // End HDK_Sample namespace

#endif