CHOP_Stair.C

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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
 * 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
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#include <SYS/SYS_Math.h>
#include <UT/UT_DSOVersion.h>
#include <OP/OP_OperatorTable.h>

#include <CH/CH_LocalVariable.h>
#include <PRM/PRM_Include.h>
#include <CHOP/PRM_ChopShared.h>

#include <CHOP/CHOP_Handle.h>
#include <OP/OP_Channels.h>
#include "CHOP_Stair.h"

using namespace HDK_Sample;

CHOP_SWITCHER2(4, "Stair", 8, "Channel");

// Names of gadgets
static PRM_Name        names[] =
{
    // Stair tab
    PRM_Name("number",          "Number of Stairs"),
    PRM_Name("height",          "Stair Height"),
    PRM_Name("offset",          "Offset"),
    PRM_Name("direction",       "Direction"),
    
    // Channel tab
    PRM_Name("channelname",     "Channel Name"),
    // RangeName
    // StartName,
    // EndName,
    // SampleRateName
    // ExtendLeftName
    // ExtendRightName
    // DefaultValueName
};

// Menus
static PRM_Name CHOPstairMenu[] = {
    PRM_Name("up",      "Up"),
    PRM_Name("down",    "Down"),
    PRM_Name(0),
};

static PRM_ChoiceList stairMenu(PRM_CHOICELIST_SINGLE,CHOPstairMenu);

// Defaults
static PRM_Default nameDefault(0,"chan1");
static PRM_Range   stairRange(PRM_RANGE_RESTRICTED, 0, PRM_RANGE_UI, 10);

PRM_Template
CHOP_Stair::myTemplateList[] =
{
    PRM_Template(PRM_SWITCHER,  3, &PRMswitcherName, switcher),

    // page 1
    PRM_Template(PRM_INT_J,     1, &names[0], PRMoneDefaults, 0, &stairRange),
    PRM_Template(PRM_FLT_J,     1, &names[1], PRMoneDefaults, 0,
                 &CHOP_DefaultValueRange),
    PRM_Template(PRM_FLT_J,     1, &names[2], PRMzeroDefaults, 0,
                 &CHOP_DefaultValueRange),
    PRM_Template(PRM_ORD,       1, &names[3], PRMzeroDefaults, &stairMenu),

    // page 2
    PRM_Template(PRM_STRING,    1, &names[4], &nameDefault,0),
    PRM_Template(PRM_ORD,       1, &CHOP_RangeName, PRMtwoDefaults,
                                   &CHOP_RangeMenu),
    PRM_Template(PRM_FLT,       1, &CHOP_StartName, &CHOP_StartDefault,0,
                 &CHOP_FrameRange),
    PRM_Template(PRM_FLT,       1, &CHOP_EndName, &CHOP_EndDefault, 0,
                 &CHOP_FrameRange),
    PRM_Template(PRM_FLT,       1, &CHOP_SampleRateName,
                 &CHOP_SampleRateDefault,0,&CHOP_SampleRateRange),
    PRM_Template(PRM_ORD,       1, &CHOP_ExtendLeftName,0, &CHOP_ExtendMenu),
    PRM_Template(PRM_ORD,       1, &CHOP_ExtendRightName,0,&CHOP_ExtendMenu),
    PRM_Template(PRM_FLT,       1, &CHOP_DefaultValueName, PRMzeroDefaults,0,
                 &CHOP_DefaultValueRange),

    PRM_Template(),
};
OP_TemplatePair CHOP_Stair::myTemplatePair(
    CHOP_Stair::myTemplateList, &CHOP_Node::myTemplatePair);



enum
{
    VAR_C               = 200,
    VAR_NC              = 201
};

CH_LocalVariable
CHOP_Stair::myVariableList[] = {
    { "C",              VAR_C, 0 },
    { "NC",             VAR_NC, 0 },
    { 0, 0, 0 }
};
OP_VariablePair CHOP_Stair::myVariablePair(
    CHOP_Stair::myVariableList, &CHOP_Node::myVariablePair);

bool
CHOP_Stair::evalVariableValue(fpreal &v, int index, int thread)
{
    switch( index )
    {
        case VAR_C:
            v = (fpreal) my_C;
            return true;

        case VAR_NC:
            v = (fpreal) my_NC;
            return true;
    }

    return CHOP_Node::evalVariableValue(v, index, thread);
}

OP_Node *
CHOP_Stair::myConstructor(OP_Network            *net,
                             const char         *name,
                             OP_Operator        *op)
{
    return new CHOP_Stair(net, name, op);
}

CHOP_Stair::CHOP_Stair( OP_Network      *net,
                          const char    *name,
                          OP_Operator   *op)
           : CHOP_Node(net, name, op),
             myExpandArray()
{
    myParmBase = getParmList()->getParmIndex( names[0].getToken() );
    my_C = 0;
    my_NC = 0;
}

CHOP_Stair::~CHOP_Stair()
{
}

bool
CHOP_Stair::updateParmsFlags()
{
    bool    changes = CHOP_Node::updateParmsFlags();

    bool use_startend = (RANGE(0.0) == RANGE_USER_ENTERED);
    changes |= enableParm("start", use_startend);
    changes |= enableParm("end", use_startend);

    if(LEXTEND() == CL_TRACK_DEFAULT || REXTEND() == CL_TRACK_DEFAULT)
        changes |= enableParm(CHOP_DefaultValueName.getToken(),1);
    else
        changes |= enableParm(CHOP_DefaultValueName.getToken(),0);

    return changes;
}


#define START_HANDLE    1
#define END_HANDLE      2
#define OFFSET_HANDLE   3

void
CHOP_Stair::cookMyHandles(OP_Context &context)
{
    CHOP_Handle         *handle;
    CHOP_HandleLook      hlook;
    fpreal               start, end;
    fpreal               xoffset, yoffset;

    destroyHandles();

    // Grab the values for our handles
    getParmIntervalInSamples(context.getTime(), start, end);
    xoffset = (end - start) * 0.75 + start;
    yoffset = OFFSET(context.getTime());

    if (RANGE(context.getTime()) == RANGE_USER_ENTERED)
    {
        // If the parameter has a channel, use a guide rather than a handle.
        hlook = myChannels->getChannel("start") ? HANDLE_GUIDE : HANDLE_BOX;

        // This creates a new handle for the start of the clip, and appends it
        // to the list of handles. It will have the label 'start' to the
        // bottom-right of the handle, and appear in bar view mode as well. It
        // moves horizontally along the frame axis.
        handle = new CHOP_Handle(this, "start", START_HANDLE, start, 0.0,
                                 hlook, HANDLE_HORIZONTAL, (HANDLE_BAR |
                                 HANDLE_LABEL_RIGHT | HANDLE_LABEL_BOTTOM));
        myHandles.append(handle);

        // The end of the clip also has a handle for adjusting the clip. Other
        // than the position, it is similar to the start handle.
        hlook = myChannels->getChannel("end") ? HANDLE_GUIDE : HANDLE_BOX;
        handle = new CHOP_Handle(this, "end", END_HANDLE, end, 0.0,
                                 hlook, HANDLE_HORIZONTAL, (HANDLE_BAR |
                                 HANDLE_LABEL_RIGHT | HANDLE_LABEL_BOTTOM |
                                 HANDLE_WIDTH_END));
        myHandles.append(handle);
    }

    // This is a horizontal handle which moves along the value axis to adjust
    // the height of a stair. This handle only appears in graph mode.
    hlook = myChannels->getChannel("offset") ? HANDLE_GUIDE : HANDLE_BOX;
    handle = new CHOP_Handle(this, "offset", OFFSET_HANDLE, xoffset, yoffset,
                             hlook, HANDLE_VERTICAL, 
                             (HANDLE_LABEL_RIGHT | HANDLE_LABEL_BOTTOM));
    myHandles.append(handle);
}

fpreal
CHOP_Stair::handleChanged(CHOP_Handle *handle, CHOP_HandleData *hdata)
{
    fpreal               result = 0.0;
    OP_Network          *net = 0;
    fpreal               offset;

    if (hdata->shift)
    {
        setCurrent(1);
        if ((net = getParent()))
            net->pickRequest(this, 0);
    }

    switch(handle->getId())
    {
        case START_HANDLE:
            offset = CL_RINT(hdata->xoffset);
            if (!hdata->shift)
                SET_START(myHandleCookTime, offset);
            result = toUnit(offset, hdata->unit);
            break;

        case END_HANDLE:
            offset = CL_RINT(hdata->xoffset);
            if (!hdata->shift)
                SET_END(myHandleCookTime, offset);
            result = toUnit(offset, hdata->unit, 1);
            break;

        case OFFSET_HANDLE:
            if (!hdata->shift)
                SET_OFFSET(myHandleCookTime, hdata->yoffset);
            result = hdata->yoffset;
            break;
    }

    return result;
}


fpreal
CHOP_Stair::shiftStart(fpreal new_offset, fpreal t)
{
    SET_START(t, new_offset);
    return new_offset;
}

OP_ERROR
CHOP_Stair::cookMyChop(OP_Context &context)
{
    CL_Track            *track;
    fpreal               samplerate;
    fpreal               start, end;
    int                  left, right;
    fpreal              *data;
    UT_String            name;
    fpreal               value;
    fpreal               defvalue;
    int                  nchan;
    fpreal               stepheight;
    fpreal               index, idxstep;
    int                  i;

    destroyClip();
    samplerate = RATE(context.getTime());
    if(SYSequalZero(samplerate))
    {
        addError(CHOP_ERROR_ZERO_SAMPLE_RATE);
        return error();
    }
    myClip->setSampleRate(samplerate);

    // Read non-expression parms
    
    CHAN_NAME(name, context.getTime());
    nchan = myExpandArray.setPattern(name);

    my_NC = nchan;
    
    getParmIntervalInSamples(context.getTime(), start, end);

    left  = LEXTEND();
    right = REXTEND();
    
    myClip->setTrackLength((int)(end-start+1));
    myClip->setStart(start);

    // Create the tracks
    
    for (my_C=0; my_C < nchan; my_C++)
    {
        defvalue   = DEFAULT(context.getTime());
        value      = OFFSET(context.getTime()); // reread for local vars
        idxstep    = (end-start+1) / (NUMBER(context.getTime()) + 1);
        stepheight = HEIGHT(context.getTime());
        if (DIRECTION() == 1)
            stepheight *= -1;

        track = myClip->addTrack(myExpandArray(my_C));

        track->setLeft((CL_TrackOutside)left);
        track->setRight((CL_TrackOutside)right);
        if(left == CL_TRACK_DEFAULT || right == CL_TRACK_DEFAULT)
            track->setDefault(defvalue);

        data = track->getData();
        track->constant(0);
        index = idxstep;
        
        for(i=0; i < (end-start+1); i++)
        {
            if (i && i > index)
            {
                value += stepheight;
                index += idxstep;
            }

            data[i] = value;
        }
    }

    my_C = 0;

    return error();
}

//----------------------------------------------------------------------------

void
newChopOperator(OP_OperatorTable *table)
    {
    table->addOperator(
        new OP_Operator("hdk_stair",                 // Internal name
                        "HDK Stair",                 // UI name
                         CHOP_Stair::myConstructor,  // CHOP constructor
                        &CHOP_Stair::myTemplatePair, // Parameters
                         0,                          // Min # of inputs
                         0,                          // Max # of inputs
                        &CHOP_Stair::myVariablePair, // Local variables
                         OP_FLAG_GENERATOR)          // generator/source
    );
}