GABC_GTUtil.h

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#ifndef __GABC_GTUtil__
#define __GABC_GTUtil__

#include "GABC_API.h"
#include "GABC_Util.h"
#include <GT/GT_Types.h>
#include <Alembic/AbcGeom/All.h>

namespace GABC_NAMESPACE
{

namespace GABC_GTUtil
{
    /// Given an Alembic DataType, determine the corresponding GT_Storage.
    static inline GT_Storage
    getGTStorage(const Alembic::AbcGeom::DataType &dtype)
    {
        switch (dtype.getPod())
        {
            case Alembic::AbcGeom::kBooleanPOD:
            case Alembic::AbcGeom::kUint8POD:
            case Alembic::AbcGeom::kInt8POD:
                return GT_STORE_UINT8;
            case Alembic::AbcGeom::kUint16POD:
            case Alembic::AbcGeom::kInt16POD:
            case Alembic::AbcGeom::kUint32POD:
            case Alembic::AbcGeom::kInt32POD:
                return GT_STORE_INT32;
            case Alembic::AbcGeom::kUint64POD:
            case Alembic::AbcGeom::kInt64POD:
                return GT_STORE_INT64;
            case Alembic::AbcGeom::kFloat16POD:
                return GT_STORE_REAL16;
            case Alembic::AbcGeom::kFloat32POD:
                return GT_STORE_REAL32;
            case Alembic::AbcGeom::kFloat64POD:
                return GT_STORE_REAL64;
            case Alembic::AbcGeom::kStringPOD:
                return GT_STORE_STRING;

            case Alembic::AbcGeom::kWstringPOD:
            case Alembic::AbcGeom::kNumPlainOldDataTypes:
            case Alembic::AbcGeom::kUnknownPOD:
                break;
        }
        return GT_STORE_INVALID;
    }

    /// Given an Alembic data type interpretation, determine the corresponding
    /// GT_Type.
    static inline GT_Type
    getGTTypeInfo(const char *interp, int tsize)
    {
        if (!strcmp(interp, "point"))
            return GT_TYPE_POINT;
        // Maya can generate UV attributes with 2 components and tag them as
        // vectors.  Houdini does not understand vectors with two components
        // so we drop the vector type info to prevent Houdini from applying
        // undesired transformation to the values.
        if (tsize == 3 && !strcmp(interp, "vector"))
            return GT_TYPE_VECTOR;
        if (!strcmp(interp, "matrix"))
            return tsize == 9 ? GT_TYPE_MATRIX3 : GT_TYPE_MATRIX;
        if (!strcmp(interp, "normal"))
            return GT_TYPE_NORMAL;
        if (!strcmp(interp, "quat"))
            return GT_TYPE_QUATERNION;
        if (!strcmp(interp, "rgb") || !strcmp(interp, "rgba"))
            return GT_TYPE_COLOR;
        if (!strcmp(interp, "box"))
            return tsize == 4 ? GT_TYPE_BOX2 : GT_TYPE_BOX;
        return GT_TYPE_NONE;
    }

}   // end GABC_GTUtil

}   // end GABC_NAMESPACE

#endif