CHOP/CHOP_Stair.h

/*
 * Copyright (c) 2013
 *      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.
 *
 *----------------------------------------------------------------------------
 */

#ifndef __CHOP_Stair__
#define __CHOP_Stair__

#include <UT/UT_ExpandArray.h>

namespace HDK_Sample {

#define ARG_STAIR_NUMBER        "number"
#define ARG_STAIR_HEIGHT        "height"
#define ARG_STAIR_OFFSET        "offset"
#define ARG_STAIR_DIRECTION     "direction"

#define ARG_STAIR_NAME          "channelname"
#define ARG_STAIR_START         "start"
#define ARG_STAIR_END           "end"
#define ARG_STAIR_RATE          CHOP_SampleRateName.getToken()
#define ARG_STAIR_LEFT          CHOP_ExtendLeftName.getToken()
#define ARG_STAIR_RIGHT         CHOP_ExtendRightName.getToken()
#define ARG_STAIR_DEFAULT       CHOP_DefaultValueName.getToken()

class CHOP_Stair : public CHOP_Node
{
public:


    static OP_Node              *myConstructor(OP_Network*, const char *,
                                                            OP_Operator *);
    static OP_TemplatePair       myTemplatePair;
    static OP_VariablePair       myVariablePair;
    static PRM_Template          myTemplateList[];
    static CH_LocalVariable      myVariableList[];

    /// Overridden to generate our channel data
    OP_ERROR                     cookMyChop(OP_Context &context);

    /// Places the handles along the channels
    void                         cookMyHandles(OP_Context &context);

    virtual unsigned             disableParms();

    /// Responds to user changes in any handle
    virtual float                handleChanged(CHOP_Handle *handle, 
                                               CHOP_HandleData *hdata);

    virtual float                shiftStart(float new_offset, float t);

protected:

                                 CHOP_Stair(OP_Network  *net, 
                                        const char *name, OP_Operator *op);
    virtual                     ~CHOP_Stair();

    /// Returns true because we use the Units parameter.
    virtual int                  usesUnits() { return 1; }

    /// Returns true because we want to use the Scope parameter
    virtual int                  usesScope() const { return 0; }

    /// Stair has some local variables defined, this returns their value.
    virtual float                getVariableValue(int index, int thread);

private:

    /// @{
    /// Convenience parameter evaluation functions
    int         NUMBER(float t)  
                { return evalInt(ARG_STAIR_NUMBER, 0, t); }

    void        SET_NUMBER(float t, int v)
                { setInt(ARG_STAIR_NUMBER, 0, t, v); }

    float       HEIGHT(float t)
                { return evalFloat(ARG_STAIR_HEIGHT, 0, t); }

    void        SET_HEIGHT(float t, float v)
                { setFloat(ARG_STAIR_HEIGHT, 0, t, v); }

    float       OFFSET(float t)
                { return evalFloat(ARG_STAIR_OFFSET, 0, t); }

    void        SET_OFFSET(float t, float v)
                { setFloat(ARG_STAIR_OFFSET, 0, t, v); }
    
    int         DIRECTION()      
                { return evalInt(ARG_STAIR_DIRECTION, 0, 0); }

    void        CHAN_NAME(UT_String &label, float t)
                { evalString(label, ARG_STAIR_NAME, 0, t); }

    float       START(float t)
                { return toSample(evalFloat(ARG_STAIR_START,0,t)); }

    void        SET_START(float t, float f)
                { setFloat(ARG_STAIR_START, 0, t, toUnit(f)); }

    float       END(float t)
                { return toSample(evalFloat(ARG_STAIR_END,0,t), UNITS(), 1); }

    void        SET_END(float t, float f)
                { setFloat(ARG_STAIR_END, 0, t, toUnit(f, UNITS(), 1)); }

    float       RATE(float t)      { return evalFloat(ARG_STAIR_RATE, 0, t); }

    void        SET_RATE(float t, float v)
                { setFloat(ARG_STAIR_RATE, 0, t, v); }

    int         LEXTEND()          { return evalInt(ARG_STAIR_LEFT,  0, 0); }
    int         REXTEND()          { return evalInt(ARG_STAIR_RIGHT, 0, 0); }
    float       DEFAULT(float t)   { return evalFloat(ARG_STAIR_DEFAULT,0,t); }
    /// @}
  
    void        getInterval(float t, float *start, float *end);

    /// Our local variable for "currently cooking channel"
    int         my_C;
    /// Our local variable for "number of channels"
    int         my_NC;
    
    UT_ExpandArray  myExpandArray;
};

}       // End of HDK_Sample namespace

#endif