samples/CHOP/CHOP_Stair.C

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/*
 * 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.
 *
 *----------------------------------------------------------------------------
 */
#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", 7, "Channel");

// Names of gadgets
static PRM_Name        names[] =
{
    PRM_Name("number",          "Number of Stairs"),
    PRM_Name("height",          "Stair Height"),
    PRM_Name("offset",          "Offset"),
    PRM_Name("direction",       "Direction"),
    
    PRM_Name("channelname",     "Channel Name"),
    PRM_Name("start",           "Start"),
    PRM_Name("end",             "End"),
    // 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_ChoiceListType)(PRM_CHOICELIST_EXCLUSIVE
                                | PRM_CHOICELIST_REPLACE),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_FLT_J,     1, &names[5], &CHOP_StartDefault,0,
                 &CHOP_FrameRange),
    PRM_Template(PRM_FLT_J,     1, &names[6], &CHOP_EndDefault, 0,
                 &CHOP_FrameRange),
    PRM_Template(PRM_FLT_J,     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_J,     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);

float
CHOP_Stair::getVariableValue(int index, int thread)
{
    switch( index )
    {
        case VAR_C:
            return my_C;

        case VAR_NC:
            return my_NC;

        default:
            return CHOP_Node::getVariableValue(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()
{
}

unsigned
CHOP_Stair::disableParms()
{
    unsigned    changes = CHOP_Node::disableParms();

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

    return changes;
}


void
CHOP_Stair::getInterval(float t, float *start, float *end)
{
    *start = START(t);
      *end = END(t);

    if (*start >= *end)
    {
        float   temp = *start;
        *start = *end;
          *end = temp;
    }

    *start = ::SYSrint(*start);
      *end = ::SYSrint(*end);
}

#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;
    float                start, end;
    float                xoffset, yoffset;

    destroyHandles();

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

    // 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);
}

float
CHOP_Stair::handleChanged(CHOP_Handle *handle, CHOP_HandleData *hdata)
{
    float                result = 0.0f;
    OP_Network          *net = 0;
    float                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;
}


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

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

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

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

    my_NC = nchan;
    
    getInterval(context.myTime, &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.myTime);
        value      = OFFSET(context.myTime);    // reread for local vars
        idxstep    = (end-start+1) / (NUMBER(context.myTime) + 1);
        stepheight = HEIGHT(context.myTime);
        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
    );
}

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