SIM/SIM_GasAdd.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:
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 *    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.
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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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 *----------------------------------------------------------------------------
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#ifndef __SIM_GasAdd_h__
#define __SIM_GasAdd_h__

#include <GAS/GAS_SubSolver.h>
#include <GAS/GAS_Utils.h>

namespace HDK_Sample {

/// A simple field manipulation class that will add fields
/// together.  
class SIM_GasAdd : public GAS_SubSolver
{
public:
    /// These macros are used to create the accessors
    /// getFieldDstName and getFieldSrcName functions we'll use
    /// to access our data options.
    GET_DATA_FUNC_S(GAS_NAME_FIELDDEST, FieldDstName);
    GET_DATA_FUNC_S(GAS_NAME_FIELDSOURCE, FieldSrcName);

protected:
    explicit             SIM_GasAdd(const SIM_DataFactory *factory);
    virtual             ~SIM_GasAdd();

    /// Used to determine if the field is complicated enough to justify
    /// the overhead of multithreading.
    bool                 shouldMultiThread(const SIM_RawField *field) const 
                         { return field->field()->numTiles() > 1; }

    /// The overloaded callback that GAS_SubSolver will invoke to
    /// perform our actual computation.  We are giving a single object
    /// at a time to work on.
    virtual bool         solveGasSubclass(SIM_Engine &engine,
                                SIM_Object *obj,
                                SIM_Time time,
                                SIM_Time timestep);

    /// Add two raw fields together.  Use UT_ThreadedAlgorithm's macros
    /// to define the addFields method that will invoke addFieldPartial()
    /// on each worker thread.
    THREADED_METHOD2(SIM_GasAdd, shouldMultiThread(dst),
                     addFields,
                     SIM_RawField *, dst,
                     const SIM_RawField *, src);

    void         addFieldsPartial(SIM_RawField *dst, const SIM_RawField *src, const UT_JobInfo &info);
    
private:
    /// We define this to be a DOP_Auto node which means we do not
    /// need to implement a DOP_Node derivative for this data.  Instead,
    /// this description is used to define the interface.
    static const SIM_DopDescription     *getDopDescription();

    /// These macros are necessary to bind our node to the factory and
    /// ensure useful constants like BaseClass are defined.
    DECLARE_STANDARD_GETCASTTOTYPE();
    DECLARE_DATAFACTORY(SIM_GasAdd,
                        GAS_SubSolver,
                        "Gas Add",
                        getDopDescription());
};

} // End HDK_Sample namespace

#endif