SOP/SOP_TimeCompare.h

/*
 * Copyright (c) 2012
 *      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
 * following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. The name of Side Effects Software may not be used to endorse or
 *    promote products derived from this software without specific prior
 *    written permission.
 *
 * 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,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *----------------------------------------------------------------------------
 * 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);
    virtual ~SOP_TimeCompare();

    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.
    virtual OP_ERROR             cookInputGroups(OP_Context &context, 
                                                int alone = 0);

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

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

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

    /// This variable is used together with the call to the "checkInputChanged"
    /// routine to notify the handles (if any) if the input has changed.
    GU_DetailGroupPair   myDetailGroupPair;

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

#endif