GT_DataArray.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        GT_DataArray.h ( GT Library, C++)
 *
 * COMMENTS:
 */

#ifndef __GT_DataArray__
#define __GT_DataArray__

#include "GT_API.h"
#include "GT_Types.h"
#include "GT_Handles.h"
#include <SYS/SYS_Hash.h>
#include <UT/UT_Assert.h>
#include <UT/UT_ParallelUtil.h>
#include <UT/UT_IntrusivePtr.h>
#include <UT/UT_Vector3.h>
#include <UT/UT_Vector4.h>
#include <UT/UT_Matrix3.h>
#include <UT/UT_Matrix4.h>
#include <UT/UT_BoundingBox.h>
#include <UT/UT_StackBuffer.h>

class UT_StringArray;
class UT_JSONWriter;
class GU_ConstDetailHandle;

class GT_DataArray;
typedef UT_IntrusivePtr<GT_DataArray>   GT_DataArrayHandle;

/// @brief Abstract data class for an array of float, int or string data
///
/// This is an abstract class.  The data does not have to be owned by this
/// array.  The data can be generated on the fly by the class.  Or the data
/// might be flat numeric data.
class GT_API GT_DataArray
    : public UT_IntrusiveRefCounter<GT_DataArray>
{
public:
             GT_DataArray();
             GT_DataArray(const GT_DataArray &src);
    virtual ~GT_DataArray();

    virtual const char *className() const = 0;

    /// Create a "hardened" version of the array
    virtual GT_DataArrayHandle  harden() const;

    /// Type of data stored in the array
    virtual GT_Storage          getStorage() const = 0;

    /// Number of entries in the array
    virtual GT_Size             entries() const = 0;

    /// Total number of array elements if this is an array attribute.
    /// Sum of each entry's array length, as each entry's array length can vary.
    virtual GT_Size             getTotalArrayEntries() const { return 0; }

    /// Number of elements for each array element
    virtual GT_Size             getTupleSize() const = 0;

    /// Get an approximation of the memory usage.  Since data is shared, this
    /// may be an over-estimation of the memory used.
    virtual int64               getMemoryUsage() const = 0;

    /// Return "type" information for the data.  This defaults to GT_TYPE_NONE
    virtual GT_Type             getTypeInfo() const;

    /// Returns "true" if each entry is an array.
    virtual bool                hasArrayEntries() const { return false; }

    /// Return "true" if there's pointer aliasing
    virtual bool                getPointerAliasing(const void *data) const
                                    { return false; }

    /// Data array is valid; can be sampled from.
    virtual bool                isValid() const { return true; }

    /// If the array has backing storage, this method can be used to access the
    /// storage.  The backing storage must be a flat array of interleaved
    /// values of the given pod type.  For example, if the array has 35 entries
    /// of fpreal32 color (RGB) data, the pointer returned should be mapped to
    /// an array that's (35*3) fpreal32 values with the first three values
    /// representing the RGB values for the first item in the array.
    virtual const void  *getBackingData() const { return nullptr; }

    /// Return the "data id" associated with the data.  The data ID will be
    /// incremented if the data is modified.  An ID less than 0 indicates that
    /// the data ID should always be considered unique and will never be the
    /// same across evaluations.  This data ID can be used to detect whether
    /// attribute data has changed in similar tesselations.
    virtual int64       getDataId() const { return myDataId; }

    /// @{
    /// Get data out of the data array
    virtual uint8       getU8(GT_Offset offset, int idx=0) const = 0;
    virtual int8        getI8(GT_Offset offset, int idx=0) const
                            { return getI32(offset, idx); }
    virtual int16       getI16(GT_Offset offset, int idx=0) const
                            { return getI32(offset, idx); }
    virtual int32       getI32(GT_Offset offset, int idx=0) const = 0;
    virtual int64       getI64(GT_Offset offset, int idx=0) const
                            { return getI32(offset, idx); }

    virtual fpreal16    getF16(GT_Offset offset, int idx=0) const
                            { return getF32(offset, idx); }
    virtual fpreal32    getF32(GT_Offset offset, int idx=0) const = 0;
    virtual fpreal64    getF64(GT_Offset offset, int idx=0) const
                            { return getF32(offset, idx); }

    virtual GT_String   getS(GT_Offset offset, int idx=0) const = 0;

    virtual bool        getSA(UT_StringArray &a, GT_Offset offset) const
                            { return false; }
    virtual bool        getFA16(UT_ValArray<fpreal16> &a, GT_Offset offset) const 
                            { return false; }
    virtual bool        getFA32(UT_ValArray<fpreal32> &a, GT_Offset offset) const
                            { return false; }
    virtual bool        getFA64(UT_ValArray<fpreal64> &a, GT_Offset offset) const
                            { return false; }
    virtual bool        getIA16(UT_ValArray<int16> &a, GT_Offset offset) const
                            { return false; }
    virtual bool        getIA32(UT_ValArray<int32> &a, GT_Offset offset) const
                            { return false; }
    virtual bool        getIA64(UT_ValArray<int64> &a, GT_Offset offset) const
                            { return false; }
    /// @}

    /// @{
    /// Get raw access to the data buffer (or fill the data array passed in)
    /// If the array is unable to provide a raw pointer to the underlying data,
    /// the GT_DataArrayHandle will be allocated to store the data, and it's
    /// raw data will be returned.
    ///
    /// This means that the data returned will be destructed when the buffer is
    /// destructed.  Beware.
    virtual const uint8         *getU8Array(GT_DataArrayHandle &buffer) const;
    virtual const int8          *getI8Array(GT_DataArrayHandle &buffer) const;
    virtual const int16         *getI16Array(GT_DataArrayHandle &buffer) const;
    virtual const int32         *getI32Array(GT_DataArrayHandle &buffer) const;
    virtual const int64         *getI64Array(GT_DataArrayHandle &buffer) const;
    virtual const fpreal16      *getF16Array(GT_DataArrayHandle &buffer) const;
    virtual const fpreal32      *getF32Array(GT_DataArrayHandle &buffer) const;
    virtual const fpreal64      *getF64Array(GT_DataArrayHandle &buffer) const;
    const fpreal                *getRealArray(GT_DataArrayHandle &buffer) const;
    /// @}

    /// Template-friendly version of getU8Array() and related methods.
    template <typename T>
    const T *getArray(GT_DataArrayHandle &buffer) const;

    /// When an array of strings is based on an indexed list of strings, this
    /// method can be used to query the maximum number of indices.  If the
    /// strings are not indexed, the method should return -1.
    virtual GT_Size     getStringIndexCount() const = 0;

    /// When an array of strings is based on an indexed list of strings, this
    /// method can be used to query each element's index.  If the strings are
    /// not indexed, the method should return -1.
    virtual GT_Offset   getStringIndex(GT_Offset offset, int idx=0) const = 0;

    /// When an array of strings is based on an indexed list of strings, this
    /// method can be used to extract all the strings and their corresponding
    /// indicies.  It's possible that the indices may not be contiguous or may
    /// even be out of order.
    virtual void        getIndexedStrings(UT_StringArray &strings,
                                        UT_IntArray &indices) const = 0;
    /// When an array of strings is based on an indexed list of strings, this
    /// method can be used to extract all the strings.  If an index is not
    /// used, the string array may contain a NULL pointer.  When you call @c
    /// getStringIndex(), you can look up directly into the @c strings array
    /// returned here.
    ///
    /// Note, if the strings are not stored as an indexed list, this method
    /// will return an empty array.
    virtual void        getStrings(UT_StringArray &strings) const;

    /// Fill an array of std::string with the strings corresponding to each
    /// entry.  There must be @c entries() strings in the array.  Only a single
    /// tuple index is extracted.
    void                fillStrings(std::string *strings,
                                int tuple_idx=0) const;

    /// Fill array of strings from start to length number of entries.
    /// This should only be called for an array attribute of strings.
    /// The @c data will contain a flattened array of strings, with
    /// the @c sizes array containing the array length per entry.
    virtual void        fillStringArray(UT_StringArray &data,
                                UT_ValArray<int> &sizes,
                                GT_Offset start, GT_Size length) const {}

    /// @{
    /// Extract data out of the array in a template friendly fashion.
    /// Unlike the @c get() methods, these methods will @b always copy data
    /// into the buffers.  If the @c size is 0, the tuple size will be used.
    /// The data buffer must be big enough.
    ///
    /// If the size given is larger than getTupleSize(), only the first
    /// @c getTupleSize() elements will be filled out (leaving the others
    /// untouched).
    void import(GT_Offset idx, int8 *data, GT_Size size=0) const
            { doImport(idx, data, size); }
    void import(GT_Offset idx, int16 *data, GT_Size size=0) const
            { doImport(idx, data, size); }
    void import(GT_Offset idx, int32 *data, GT_Size size=0) const
            { doImport(idx, data, size); }
    void import(GT_Offset idx, int64 *data, GT_Size size=0) const
            { doImport(idx, data, size); }
    void import(GT_Offset idx, fpreal16 *data, GT_Size size=0) const
            { doImport(idx, data, size); }
    void import(GT_Offset idx, fpreal32 *data, GT_Size size=0) const
            { doImport(idx, data, size); }
    void import(GT_Offset idx, fpreal64 *data, GT_Size size=0) const
            { doImport(idx, data, size); }
    void import(GT_Offset idx, UT_ValArray<fpreal16> &data) const
            { doImportArray(idx, data); }
    void import(GT_Offset idx, UT_ValArray<fpreal32> &data) const
            { doImportArray(idx, data); }
    void import(GT_Offset idx, UT_ValArray<fpreal64> &data) const
            { doImportArray(idx, data); }
    void import(GT_Offset idx, UT_ValArray<int16> &data) const
            { doImportArray(idx, data); }
    void import(GT_Offset idx, UT_ValArray<int32> &data) const
            { doImportArray(idx, data); }
    void import(GT_Offset idx, UT_ValArray<int64> &data) const
            { doImportArray(idx, data); }
    void import(GT_Offset idx, UT_StringArray &data) const
            { getSA(data, idx); }
    void import(GT_Offset idx, uint8 *data, GT_Size size=0,
                    fpreal black=0, fpreal white=1) const
            {
                if (GTisFloat(getStorage()))
                    doImportQuantized(idx, data, size, black, white);
                else
                    doImport(idx, data, size);
            }
    /// @}

    /// @{
    /// Extract data for the entire array into a flat data array.
    /// By default, this is implemented as: @code
    ///     if (tuple_size <= 0)
    ///         tuple_size = getTupleSize();
    ///     for (GT_Offset idx = 0; idx < length; ++idx, data += tuple_size)
    ///         import(idx+start, data, tuple_size);
    /// @endcode
    /// Obviously, the @c data array should be big enough to hold @c
    /// length*tuple_size elements.
    ///
    /// The tuple size (@c tsize) specifies how many elements to extract from
    /// each element of this array.  The @c stride specifies how many items to
    /// skip over for each element.  With a stride of -1, the stride will be
    /// set to the @c tsize.  Otherwise the stride will be set to the maximum
    /// of @c tsize and @c stride.
    ///
    /// The stride can be useful when trying to interleave data.  For example:
    /// @code
    ///    float uvbuf[ucoord->entries()*2];
    ///    ucoord->fillArray(&uvbuf[0], 0, ucoord->entries(), 1, 2);
    ///    vcoord->fillArray(&uvbuf[1], 0, vcoord->entries(), 1, 2);
    /// @endcode
    void fillArray(int8 *data, GT_Offset start, GT_Size length,
                        int tsize, int stride=-1) const
                    { doFillArray(data, start, length, tsize, stride); }
    void fillArray(int16 *data, GT_Offset start, GT_Size length,
                        int tsize, int stride=-1) const
                    { doFillArray(data, start, length, tsize, stride); }
    void fillArray(int32 *data, GT_Offset start, GT_Size length,
                        int tsize, int stride=-1) const
                    { doFillArray(data, start, length, tsize, stride); }
    void fillArray(int64 *data, GT_Offset start, GT_Size length,
                        int tsize, int stride=-1) const
                    { doFillArray(data, start, length, tsize, stride); }
    void fillArray(fpreal16 *data, GT_Offset start, GT_Size length,
                        int tsize, int stride=-1) const
                    { doFillArray(data, start, length, tsize, stride); }
    void fillArray(fpreal32 *data, GT_Offset start, GT_Size length,
                        int tsize, int stride=-1) const
                    { doFillArray(data, start, length, tsize, stride); }
    void fillArray(fpreal64 *data, GT_Offset start, GT_Size length,
                        int tsize, int stride=-1) const
                    { doFillArray(data, start, length, tsize, stride); }
    void fillArray(uint8 *data,
                        GT_Offset start, GT_Size length,
                        int tsize, int stride=-1,
                        fpreal black=0, fpreal white=1) const
                    {
                        if(GTisFloat(getStorage()))
                            doFillQuantizedArray(data, start, length, tsize,
                                                 stride, black, white);
                        else
                            doFillArray(data, start, length, tsize, stride);
                    }

    void fillVec3BBox(fpreal32 *dest, GT_Offset start, GT_Size length,
                      UT_BoundingBoxF &bbox, int tsize, int stride=-1)
                    {
                        UT_ASSERT_P(tsize==3);
                        doFillVec3BBox(dest, start, length, bbox,
                                       tsize, stride);
                    }
    void fillVec3BBox(fpreal64 *dest, GT_Offset start, GT_Size length,
                      UT_BoundingBoxD &bbox, int tsize, int stride=-1)
                    {
                        UT_ASSERT_P(tsize==3);
                        doFillVec3BBox(dest, start, length, bbox,
                                       tsize, stride);
                    }
    /// @}

    /// @{
    /// Extract data for an array attribute into a flat data array.
    /// Since each entry in an array attribute varies in terms of array size,
    /// the sizes of each entry will be stored in the @c sizes array.
    void fillArray(UT_Array<int16> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length)
                    { doFillArrayAttr(data, sizes, start, length); }
    void fillArray(UT_Array<int32> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length)
                    { doFillArrayAttr(data, sizes, start, length); }
    void fillArray(UT_Array<int64> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length)
                    { doFillArrayAttr(data, sizes, start, length); }
    void fillArray(UT_Array<fpreal16> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length)
                    { doFillArrayAttr(data, sizes, start, length); }
    void fillArray(UT_Array<fpreal32> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length)
                    { doFillArrayAttr(data, sizes, start, length); }
    void fillArray(UT_Array<fpreal64> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length)
                    { doFillArrayAttr(data, sizes, start, length); }
    /// @}

    virtual void extendedFillArray(uint8 *data,
                        GT_Offset start, GT_Size length,
                        int tsize, int nrepeats,
                        int stride=-1,
                        fpreal black=0, fpreal white=1) const
                    {
                        doExtendedQuantizedFill(data, start, length, tsize,
                                        nrepeats, stride, black, white);
                    }

    /// @{
    /// Extract an element, but making @c nrepeats copies.  The buffer
    /// should be able to contain @c length*nrepeats*tsize elements
    /// When filling an RGB color, with a repeat count of 4, the resulting
    /// buffer will look like: @code
    ///  [ RGB0 RGB0 RGB0 RGB0 RGB1 RGB1 RGB1 RGB1 ... ]
    /// @endcode
    /// With a repeat count of 1, this is equivalent to @c fillArray()
    virtual void extendedFill(uint8 *data, GT_Offset start, GT_Size length,
                        int tsize, int nrepeats, int stride=-1) const
                    {
                        t_extendedFill(data, start, length, tsize,
                                        nrepeats, stride);
                    }
    virtual void extendedFill(int8 *data, GT_Offset start, GT_Size length,
                        int tsize, int nrepeats, int stride=-1) const
                    {
                        t_extendedFill(data, start, length, tsize,
                                        nrepeats, stride);
                    }
    virtual void extendedFill(int16 *data, GT_Offset start, GT_Size length,
                        int tsize, int nrepeats, int stride=-1) const
                    {
                        t_extendedFill(data, start, length, tsize,
                                        nrepeats, stride);
                    }
    virtual void extendedFill(int32 *data, GT_Offset start, GT_Size length,
                        int tsize, int nrepeats, int stride=-1) const
                    {
                        t_extendedFill(data, start, length, tsize,
                                        nrepeats, stride);
                    }
    virtual void extendedFill(int64 *data, GT_Offset start, GT_Size length,
                        int tsize, int nrepeats, int stride=-1) const
                    {
                        t_extendedFill(data, start, length, tsize,
                                        nrepeats, stride);
                    }
    virtual void extendedFill(fpreal16 *data, GT_Offset start, GT_Size length,
                        int tsize, int nrepeats, int stride=-1) const
                    {
                        t_extendedFill(data, start, length, tsize,
                                        nrepeats, stride);
                    }
    virtual void extendedFill(fpreal32 *data, GT_Offset start, GT_Size length,
                        int tsize, int nrepeats, int stride=-1) const
                    {
                        t_extendedFill(data, start, length, tsize,
                                        nrepeats, stride);
                    }
    virtual void extendedFill(fpreal64 *data, GT_Offset start, GT_Size length,
                        int tsize, int nrepeats, int stride=-1) const
                    {
                        t_extendedFill(data, start, length, tsize,
                                        nrepeats, stride);
                    }
    /// @}

    /// @{
    /// Copy the data out of the array as a tuple of @em size entries
    /// The data may be copied, or the array may return a pointer to raw data.
    /// That is, the sub-class may @b not copy the data into the storage.
    virtual const uint8         *get(GT_Offset i, uint8 *store, int sz) const;
    virtual const int8          *get(GT_Offset i, int8 *store, int sz) const;
    virtual const int16         *get(GT_Offset i, int16 *store, int sz) const;
    virtual const int32         *get(GT_Offset i, int32 *store, int sz) const;
    virtual const int64         *get(GT_Offset i, int64 *store, int sz) const;
    virtual const fpreal16      *get(GT_Offset i, fpreal16 *store, int z) const;
    virtual const fpreal32      *get(GT_Offset i, fpreal32 *store, int z) const;
    virtual const fpreal64      *get(GT_Offset i, fpreal64 *store, int z) const;
    /// @}

    /// @{
    /// Get the range of values in the array
    virtual void        getRange(exint &lo, exint &hi, int tuple_idx=0) const;
    virtual void        getRange(fpreal &lo, fpreal &hi, int tidx=0) const;
    /// @}

    /// Compare whether two data arrays are equal.
    virtual bool        isEqual(const GT_DataArray &src) const;

    /// @{
    /// Compute a hash of the data in the array.  The base class hash is computed
    /// @code
    ///   SYS_HashType hash = 0;
    ///   for (i = begin; i < end; ++i) {
    ///      import(i, tmp, getTupleSize());
    ///      for (t = 0; t < getTupleSize(); t++)
    ///          SYShashCombine(hash, hashNumeric(tmp[t]));
    ///   }
    /// @endcode
    /// Where @c hashNumeric returns the value for integer types.  Real data is
    /// cast to the corresponding unsigned integer values.  For example, fpreal16 @code
    ///    void hashNumeric(SYS_HashType &hash, fpreal16 v) {
    ///        SYShashCombine(hash, *(const uint16 *)(&v));
    ///    }
    ///    void hashNumeric(SYS_HashType &hash, fpreal32 v) {
    ///        SYShashCombine(hash, *(const uint32 *)(&v));
    ///    }
    /// @endcode
    SYS_HashType                hash() const { return hashRange(0, entries()); }
    virtual SYS_HashType        hashRange(exint begin, exint end) const;
    /// @}

    /// Enlarge a bounding box with values of this 3-tuple array
    bool        getMinMax(fpreal64 *min, fpreal64 *max) const
    {
        // Initialize min/max
        for (int i = 0, n = getTupleSize(); i < n; ++i)
        {
            min[i] =  SYS_FP64_MAX;
            max[i] = -SYS_FP64_MAX;
        }
        if (getStorage() == GT_STORE_STRING)
            return false;
        if (!entries())
            return true;
        return computeMinMax(min, max);
    }
    bool        enlargeBounds(UT_BoundingBox &b) const
    {
        int                             tsize = getTupleSize();
        UT_StackBuffer<fpreal64>        min(tsize), max(tsize);
        getMinMax(min, max);
        b.enlargeBounds(min[0], min[1], min[2]);
        b.enlargeBounds(max[0], max[1], max[2]);
        return true;
    }

    /// Test to see whether the data array requires int32 or int64 indexing.
    GT_Storage  checkIndexing(GT_IndexingMode mode) const;

    /// Quick & dirty test to see if a size is bigger than a 32 bit int
    static bool isBigInteger(GT_Size size)
                    { return size >= (((int64)1) << 31); }

    /// For debugging, print values to stdout
    void        dumpValues(const char *msg=NULL) const;

    /// Save array to a JSON stream. The 'flat' determines how to output
    /// arrays with a tuple size greater than 1. If 'flat' is true, the
    /// output will be an uninterrupted stream of values. If 'flat' is
    /// false, then the output will look something like [[1,2,3],[4,5,6], ... ]
    bool        save(UT_JSONWriter &w, bool flat = true) const;

    /// @{
    /// For memory tracking, we override the new/delete operators
    static void *operator       new(size_t size);
    static void *operator       new(size_t size, void *p);
    static void  operator       delete(void *p, size_t size);
    /// @}

    /// Forcibly set the data id for the array.  You take responsibility for
    /// all artifacts and crashes if you call this indiscriminately.
    void        copyDataId(const GT_DataArray &src)
                    { setDataId(src.getDataId()); }

    /// Set the data id - This is used by geometry arrays to copy over the data
    /// id from GA. As above, you take responsibility for all artifacts and
    /// crashes if you set this incorrectly. Do not set this if you don't
    /// know how data IDs work.
    void        setDataId(int64 id)     { myDataId = id; }
    
    /// Update cached data, in case the underlying attribute changed.
    virtual void        updateGeoDetail(const GU_ConstDetailHandle &dtl,
                                        const char *attrib_name,
                                        GT_Owner attrib_owner,
                                        const int expected_size) {}

protected:
    /// Compute the min & max values for an array.  This fails for strings
    class minMaxTask
    {
    public:
        minMaxTask(const GT_DataArray &array)
            : myArray(array)
            , myTupleSize(array.getTupleSize())
        {
            initBuffers();
            for (int j = 0; j < myTupleSize; ++j)
            {
                myMin[j] =  SYS_FP64_MAX;
                myMax[j] = -SYS_FP64_MAX;
            }
        }
        minMaxTask(minMaxTask &src, UT_Split)
            : myArray(src.myArray)
            , myTupleSize(src.myTupleSize)
        {
            initBuffers();
            std::copy(src.myMin, src.myMin+myTupleSize, myMin);
            std::copy(src.myMax, src.myMax+myTupleSize, myMax);
        }
        ~minMaxTask()
        {
            if (myMin != myMinBuffer)
            {
                delete [] myMin;
                delete [] myMax;
                delete [] myPos;
            }
        }
        void    operator()(const UT_BlockedRange<GT_Size> &range)
        {
            for (GT_Size i = range.begin(), n = range.end(); i < n; ++i)
            {
                myArray.import(i, myPos, myTupleSize);
                for (int j = 0; j < myTupleSize; ++j)
                {
                    myMin[j] = SYSmin(myMin[j], myPos[j]);
                    myMax[j] = SYSmax(myMax[j], myPos[j]);
                }
            }
        }
        void    getResult(fpreal64 *min, fpreal64 *max) const
        {
            for (int j = 0; j < myTupleSize; ++j)
            {
                min[j] = SYSmin(min[j], myMin[j]);
                max[j] = SYSmax(max[j], myMax[j]);
            }
        }
        void    join(const minMaxTask &src)
        {
            for (int j = 0; j < myTupleSize; ++j)
            {
                myMin[j] = SYSmin(myMin[j], src.myMin[j]);
                myMax[j] = SYSmax(myMax[j], src.myMax[j]);
            }
        }
    private:
        void    initBuffers()
        {
            if (myTupleSize > 16)
            {
                myMin = new fpreal64[myTupleSize];
                myMax = new fpreal64[myTupleSize];
                myPos = new fpreal64[myTupleSize];
            }
            else
            {
                myMin = myMinBuffer;
                myMax = myMaxBuffer;
                myPos = myPosBuffer;
            }
        }
        const GT_DataArray      &myArray;
        fpreal64                *myMin;
        fpreal64                *myMax;
        fpreal64                *myPos;
        fpreal64                 myMinBuffer[16];
        fpreal64                 myMaxBuffer[16];
        fpreal64                 myPosBuffer[16];
        int                      myTupleSize;
    };
    virtual bool        computeMinMax(fpreal64 *min, fpreal64 *max) const
    {
        minMaxTask      task(*this);
        UTparallelReduceLightItems(UT_BlockedRange<GT_Size>(0, entries()), task);
        task.getResult(min, max);
        return true;
    }
    /// Ensure the size is set properly when performing an import.  If the size
    /// isn't specified, we use the array's tuple size, otherwise we make sure
    /// to clamp the tuple size.
    SYS_STATIC_FORCE_INLINE GT_Size
    fixImportTupleSize(GT_Size size, GT_Size tuple_size)
    {
        return size == 0 ? tuple_size : SYSmin(size, tuple_size);
    }

    /// @{
    /// Virtual implementation for inline methods.
    /// Note that @c doImport is for tuple data, while @c doImportArray
    /// is for tuple array data.
    virtual void doImport(GT_Offset idx, uint8 *data, GT_Size size) const;
    virtual void doImport(GT_Offset idx, int8 *data, GT_Size size) const;
    virtual void doImport(GT_Offset idx, int16 *data, GT_Size size) const;
    virtual void doImport(GT_Offset idx, int32 *data, GT_Size size) const;
    virtual void doImport(GT_Offset idx, int64 *data, GT_Size size) const;
    virtual void doImport(GT_Offset idx, fpreal16 *data, GT_Size size) const;
    virtual void doImport(GT_Offset idx, fpreal32 *data, GT_Size size) const;
    virtual void doImport(GT_Offset idx, fpreal64 *data, GT_Size size) const;
    virtual void doImportArray(GT_Offset idx, UT_ValArray<fpreal16> &data) const;
    virtual void doImportArray(GT_Offset idx, UT_ValArray<fpreal32> &data) const;
    virtual void doImportArray(GT_Offset idx, UT_ValArray<fpreal64> &data) const;
    virtual void doImportArray(GT_Offset idx, UT_ValArray<int16> &data) const;
    virtual void doImportArray(GT_Offset idx, UT_ValArray<int32> &data) const;
    virtual void doImportArray(GT_Offset idx, UT_ValArray<int64> &data) const;
    virtual void doImportQuantized(GT_Offset idx, uint8 *data, GT_Size size,
                                fpreal black, fpreal white) const;
    
    virtual void doFillArray(uint8 *data, GT_Offset start, GT_Size length,
                        int tuple_size, int stride) const
                 { t_extendedFill(data, start, length, tuple_size, 1, stride); }

    virtual void doFillArray(int8 *data, GT_Offset start, GT_Size length,
                        int tuple_size, int stride) const
                 { t_extendedFill(data, start, length, tuple_size, 1, stride); }
    virtual void doFillArray(int16 *data, GT_Offset start, GT_Size length,
                        int tuple_size, int stride) const
                 { t_extendedFill(data, start, length, tuple_size, 1, stride); }
    virtual void doFillArray(int32 *data, GT_Offset start, GT_Size length,
                        int tuple_size, int stride) const
                 { t_extendedFill(data, start, length, tuple_size, 1, stride); }
    virtual void doFillArray(int64 *data, GT_Offset start, GT_Size length,
                        int tuple_size, int stride) const
                 { t_extendedFill(data, start, length, tuple_size, 1, stride); }
    virtual void doFillArray(fpreal16 *data, GT_Offset start, GT_Size length,
                        int tuple_size, int stride) const
                 { t_extendedFill(data, start, length, tuple_size, 1, stride); }
    virtual void doFillArray(fpreal32 *data, GT_Offset start, GT_Size length,
                        int tuple_size, int stride) const
                 { t_extendedFill(data, start, length, tuple_size, 1, stride); }
    virtual void doFillArray(fpreal64 *data, GT_Offset start, GT_Size length,
                        int tuple_size, int stride) const
                 { t_extendedFill(data, start, length, tuple_size, 1, stride); }
    virtual void doFillArrayAttr(UT_Array<int16> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length) const
                 { t_extendedFillArray(data, sizes, start, length); }
    virtual void doFillArrayAttr(UT_Array<int32> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length) const
                 { t_extendedFillArray(data, sizes, start, length); }
    virtual void doFillArrayAttr(UT_Array<int64> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length) const
                 { t_extendedFillArray(data, sizes, start, length); }
    virtual void doFillArrayAttr(UT_Array<fpreal16> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length) const
                 { t_extendedFillArray(data, sizes, start, length); }
    virtual void doFillArrayAttr(UT_Array<fpreal32> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length) const
                 { t_extendedFillArray(data, sizes, start, length); }
    virtual void doFillArrayAttr(UT_Array<fpreal64> &data, UT_Array<int> &sizes,
                        GT_Offset start, GT_Size length) const
                 { t_extendedFillArray(data, sizes, start, length); }
    
    virtual void doFillQuantizedArray(uint8 *data,
                        GT_Offset start, GT_Size length,
                        int tuple_size, int stride,
                        fpreal black, fpreal white) const
                    {
                        doExtendedQuantizedFill(data, start, length, tuple_size,
                                                1, stride, black, white);
                    }
    virtual void doExtendedQuantizedFill(uint8 *data,
                        GT_Offset start, GT_Size length,
                        int tuple_size, int nrepeats, int stride,
                        fpreal black, fpreal white) const;

    /// Nested class to perform filling for a POD array
    template <typename T_POD>
    class fillV3BoxTask
    {
    public:
        fillV3BoxTask(const GT_DataArray &array, T_POD *data,
                GT_Offset start, int stride)
            : myArray(array)
            , myData(data)
            , myStart(start)
            , myStride(stride)
        {
            myBox.initBounds();
        }
        fillV3BoxTask(fillV3BoxTask &src, UT_Split)
            : myArray(src.myArray)
            , myBox(src.myBox)
            , myData(src.myData)
            , myStart(src.myStart)
            , myStride(src.myStride)
        {
        }
        void    operator()(const UT_BlockedRange<exint> &range)
        {
            exint        i = range.begin();
            T_POD       *dest = myData + i*myStride;
            for (; i != range.end(); ++i, dest += myStride)
            {
                myArray.import(i+myStart, dest, 3);
                myBox.enlargeBounds(dest[0], dest[1], dest[2]);
            }
        }
        void    join(const fillV3BoxTask<T_POD> &src)
        {
            myBox.enlargeBounds(src.myBox);
        }
        const UT_BoundingBox    &box() const    { return myBox; }
    private:
        const GT_DataArray      &myArray;
        UT_BoundingBox           myBox;
        T_POD                   *myData;
        GT_Offset                myStart;
        int                      myStride;
    };

    virtual void doFillVec3BBox(fpreal32 *dest, GT_Offset start, GT_Size length,
                                UT_BoundingBoxF &bbox, int, int stride)
    {
        stride = SYSmax(stride, 3);
        fillV3BoxTask<fpreal32> task(*this, dest, start, stride);
        UTparallelReduceLightItems(UT_BlockedRange<exint>(0, length), task);
        bbox = task.box();
    }
    virtual void doFillVec3BBox(fpreal64 *dest, GT_Offset start, GT_Size length,
                                UT_BoundingBoxD &bbox, int, int stride)
    {
        stride = SYSmax(stride, 3);
        fillV3BoxTask<fpreal64> task(*this, dest, start, stride);
        UTparallelReduceLightItems(UT_BlockedRange<exint>(0, length), task);
        bbox = task.box();
    }
    /// @}

    /// Templated method to fill an array
    template <typename T_POD> void
    t_extendedFill(T_POD *dest, GT_Offset start, GT_Size length,
                    int tsize, int nrepeats, int stride) const;

    /// Templated method to fill an array attribute
    template <typename T_POD> void
    t_extendedFillArray(UT_Array<T_POD> &dest, UT_Array<int> &sizes, 
                    GT_Offset start, GT_Size length) const;

private:
    /// @{
    /// @private
    /// Get more complicated POD data types out of the array
    template <typename T, int tuplesize> class VectorPODAccessor
    {
        public:
            static T    getValue(const GT_DataArray &array, GT_Offset offset)
                        {
                            T   result;
                            UT_ASSERT_P(array.getTupleSize() >= tuplesize);
                            array.get(offset, result.data(), tuplesize);
                            return result;
                        }
    };
    class I32Accessor {
        public:
            static int32 getValue(const GT_DataArray &a, GT_Offset i)
                            { return a.getI32(i); }
    };
    class I64Accessor {
        public:
            static int64 getValue(const GT_DataArray &a, GT_Offset i)
                            { return a.getI64(i); }
    };
    class F16Accessor {
        public:
            static fpreal16 getValue(const GT_DataArray &a, GT_Offset i)
                            { return a.getF16(i); }
    };
    class F32Accessor {
        public:
            static fpreal32 getValue(const GT_DataArray &a, GT_Offset i)
                            { return a.getF32(i); }
    };
    class F64Accessor {
        public:
            static fpreal64 getValue(const GT_DataArray &a, GT_Offset i)
                            { return a.getF64(i); }
    };
    /// @}

    /// @{
    /// @private
    /// Private template class to register POD accessors
    template <typename T, int FAKE> class TypeInfo {};
    /// @}

    /// @{
    /// @private
    /// Simple scalar and vector accessors
    template <int FAKE> class TypeInfo<int32, FAKE>
        { public: typedef I32Accessor Accessors; };
    template <int FAKE> class TypeInfo<int64, FAKE>
        { public: typedef I64Accessor Accessors; };
    template <int FAKE> class TypeInfo<fpreal16, FAKE>
        { public: typedef F16Accessor Accessors; };
    template <int FAKE> class TypeInfo<fpreal32, FAKE>
        { public: typedef F32Accessor Accessors; };
    template <int FAKE> class TypeInfo<fpreal64, FAKE>
        { public: typedef F64Accessor Accessors; };

    template <int FAKE> class TypeInfo<UT_Vector3F, FAKE>
        { public: typedef VectorPODAccessor<UT_Vector3F, 3> Accessors; };
    template <int FAKE> class TypeInfo<UT_Vector3D, FAKE>
        { public: typedef VectorPODAccessor<UT_Vector3D, 3> Accessors; };
    template <int FAKE> class TypeInfo<UT_Vector4F, FAKE>
        { public: typedef VectorPODAccessor<UT_Vector4F, 4> Accessors; };
    template <int FAKE> class TypeInfo<UT_Vector4D, FAKE>
        { public: typedef VectorPODAccessor<UT_Vector4D, 4> Accessors; };
    template <int FAKE> class TypeInfo<UT_Matrix3F, FAKE>
        { public: typedef VectorPODAccessor<UT_Matrix3F, 9> Accessors; };
    template <int FAKE> class TypeInfo<UT_Matrix3D, FAKE>
        { public: typedef VectorPODAccessor<UT_Matrix3D, 9> Accessors; };
    template <int FAKE> class TypeInfo<UT_Matrix4F, FAKE>
        { public: typedef VectorPODAccessor<UT_Matrix4F, 16> Accessors; };
    template <int FAKE> class TypeInfo<UT_Matrix4D, FAKE>
        { public: typedef VectorPODAccessor<UT_Matrix4D, 16> Accessors; };
    /// @}
public:
    /// Public accessor for POD types
    template <typename T>       T
        getValue(GT_Offset index) const
            { return TypeInfo<T, 0>::Accessors::getValue(*this, index); }

    template <typename T>       T
        lerpValue(GT_Offset i0, GT_Offset i1, fpreal t) const
        {
            return (1-t)*getValue<T>(i0) + t*getValue<T>(i1);
        }

    template <typename T>       T
        bilerpValue( GT_Offset u0v0, GT_Offset u1v0,
                GT_Offset u0v1, GT_Offset u1v1, fpreal u, fpreal v)
        {
            T   l = (1-v)*getValue<T>(u0v0) + v*getValue<T>(u0v1);
            T   r = (1-v)*getValue<T>(u1v0) + v*getValue<T>(u1v1);
            return (1-u)*l + u*r;
        }

private:
    int64               myDataId;
};

#endif