samples/SOP/SOP_DetailAttrib.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.
 *
 *----------------------------------------------------------------------------
 * DetailAttrib SOP
 */

#include <UT/UT_DSOVersion.h>
#include <GEO/GEO_PointRef.h>
#include <GU/GU_Detail.h>
#include <PRM/PRM_Include.h>
#include <OP/OP_Operator.h>
#include <OP/OP_OperatorTable.h>
#include "SOP_DetailAttrib.h"

using namespace HDK_Sample;
void
newSopOperator(OP_OperatorTable *table)
{
     table->addOperator(new OP_Operator("hdk_detailattrib",
                                        "DetailAttrib",
                                         SOP_DetailAttrib::myConstructor,
                                         SOP_DetailAttrib::myTemplateList,
                                         1,
                                         1));
}


static PRM_Name         sop_names[] = {
    PRM_Name("attribname",      "Attribute"),
    PRM_Name("value",           "Value"),
};

static PRM_Default      sop_valueDefault(0.1);
static PRM_Range        sop_valueRange(PRM_RANGE_RESTRICTED,0,PRM_RANGE_UI,1);

PRM_Template
SOP_DetailAttrib::myTemplateList[]=
{
    PRM_Template(PRM_STRING,    1, &sop_names[0], 0),
    PRM_Template(PRM_FLT_J,     1, &sop_names[1], &sop_valueDefault, 0,
                                   &sop_valueRange), 
    PRM_Template()
};


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


SOP_DetailAttrib::SOP_DetailAttrib(OP_Network *net, const char *name, OP_Operator *entry)
        : SOP_Node(net, name, entry) 
{ 
}

SOP_DetailAttrib::~SOP_DetailAttrib() 
{
}


unsigned
SOP_DetailAttrib::disableParms()
{
    int         changed = 0;

    return changed;
}


OP_ERROR
SOP_DetailAttrib::cookMySop(OP_Context &context)
{
    float                        t = context.myTime;
    UT_String                    aname;
    int                          aoff, asize;
    GB_AttribType                atype;
    GB_Attribute                *attrib;
    static float                 zero = 0.0;            // Initializer
    float                       *detailattrib;

    if (lockInputs(context) >= UT_ERROR_ABORT)
        return error();

    duplicateSource(0, context);

    ATTRIBNAME(aname, t);

    // Try with a float
    atype = GB_ATTRIB_FLOAT;
    attrib = gdp->attribs().find(aname, atype);

    if (!attrib)
    {
        // Not present, so create the detail attribute:
        gdp->addAttrib(aname, sizeof(float), GB_ATTRIB_FLOAT, &zero);
        attrib = gdp->attribs().find(aname, atype);
    }
    
    asize = attrib->getSize();
    aoff = gdp->attribs().getOffset(aname, atype);

    detailattrib = gdp->attribs().castAttribData<float>(aoff);

    // Set the value:
    *detailattrib = VALUE(t);

    unlockInputs();
    return error();
}

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