Alembic/AbcGeom/Foundation.h

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//-*****************************************************************************
//
// Copyright (c) 2009-2011,
//  Sony Pictures Imageworks, Inc. and
//  Industrial Light & Magic, a division of Lucasfilm Entertainment Company Ltd.
//
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// *       Redistributions in binary form must reproduce the above
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//-*****************************************************************************

#ifndef _Alembic_AbcGeom_Foundation_h_
#define _Alembic_AbcGeom_Foundation_h_

#include <Alembic/Abc/All.h>

#include <ImathMatrixAlgo.h>
#include <ImathEuler.h>


namespace Alembic {
namespace AbcGeom {
namespace ALEMBIC_VERSION_NS {

namespace Abc = ::Alembic::Abc::ALEMBIC_VERSION_NS;
using namespace Abc;

//-*****************************************************************************
//! Meshes have topology, which can be either unchanging (constant)
//! homogeneous, which indicates that the connectivity is unchanging,
//! but the positions may change, and finally heterogeneous, which indicates
//! that the connectivity and positions may change.
enum MeshTopologyVariance
{
    kConstantTopology,
    kHomogenousTopology,
    kHeterogenousTopology
};

//-*****************************************************************************
//! \brief Enum that indicates the type of transformational operation.
//! This enum is used when encoding and decoding the transform operation data.
enum XformOperationType
{
    kScaleOperation = 0,
    kTranslateOperation = 1,
    kRotateOperation = 2,
    kMatrixOperation = 3,
    kRotateXOperation = 4,
    kRotateYOperation = 5,
    kRotateZOperation = 6
};

//-*****************************************************************************
//! \brief Enum that indicates the type of 2d operation for cameras.
//! This enum is used when encoding and decoding the 2d filmback data for
//! cameras.
enum FilmBackXformOperationType
{
    kScaleFilmBackOperation = 0,
    kTranslateFilmBackOperation = 1,
    kMatrixFilmBackOperation = 2
};

//-*****************************************************************************
//! This utility function sets an array prorperty sample using "set" if
//! the sample is non-null, otherwise calls setFromPrevious.
template <class PROP, class SAMP>
inline void SetPropUsePrevIfNull( PROP iProp, SAMP iSamp )
{
    if ( iProp )
    {
        // really only valid with array properties
        assert( iProp.isArray() );

        if ( iSamp ) { iProp.set( iSamp ); }
        else { iProp.setFromPrevious(); }
    }
}

template <>
inline void SetPropUsePrevIfNull<Abc::OStringProperty, std::string>(
    Abc::OStringProperty iProp, std::string iSamp )
{
    if ( ! iProp ) { return; }
    if ( iSamp != "" ) { iProp.set( iSamp ); }
    else { iProp.setFromPrevious(); }
}

template <>
inline void SetPropUsePrevIfNull<Abc::OWstringProperty, Alembic::Util::wstring>(
    Abc::OWstringProperty iProp, Alembic::Util::wstring iSamp )
{
    if ( ! iProp ) { return; }
    if ( iSamp != L"" ) { iProp.set( iSamp ); }
    else { iProp.setFromPrevious(); }
}

template <>
inline void SetPropUsePrevIfNull<Abc::OBox3dProperty, Abc::Box3d>(
    Abc::OBox3dProperty iProp, Abc::Box3d iSamp )
{
    if ( ! iProp ) { return; }
    if ( iSamp.hasVolume() ) { iProp.set( iSamp ); }
    else { iProp.setFromPrevious(); }
}

//-*****************************************************************************
//! This utility function computes an axis-aligned bounding box from a
//! positions sample
template <class ARRAYSAMP>
static Abc::Box3d ComputeBoundsFromPositions( const ARRAYSAMP &iSamp )
{
    Abc::Box3d ret;
    size_t size = iSamp.size();
    for ( size_t i = 0 ; i < size ; ++i )
    {
        ret.extendBy( iSamp[i] );
    }

    return ret;
}

//-*****************************************************************************
//! used in xform rotation conversion
inline double DegreesToRadians( double iDegrees )
{
    return ( iDegrees * M_PI ) / 180.0;
}

inline double RadiansToDegrees( double iRadians )
{
    return iRadians * ( 180.0 / M_PI );
}

//-*****************************************************************************
//! A couple simple tests for if something is a GeomParam
inline bool IsGeomParam( const AbcA::MetaData &iMetaData )
{
    return iMetaData.get( "isGeomParam" ) == "true";
}

inline bool IsGeomParam( const AbcA::PropertyHeader &iHeader )
{
    return IsGeomParam( iHeader.getMetaData() );
}

} // End namespace ALEMBIC_VERSION_NS

using namespace ALEMBIC_VERSION_NS;

} // End namespace AbcGeom
} // End namespace Alembic

#endif

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