GA_MergeOptions.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:        GA_MergeOptions.h ( GA Library, C++)
 *
 * COMMENTS:
 */

#ifndef __GA_MergeOptions__
#define __GA_MergeOptions__

#include "GA_API.h"
#include "GA_Range.h"
#include "GA_Types.h"
#include "GA_ReuseStrategy.h"

#include <SYS/SYS_Math.h>


class GA_Detail;
class GA_Primitive;

template <typename T> class UT_Array;


/// @brief Provide options when performing a merge operation.
///
/// This class stores generic options which can be set/accessed when merging.
///
/// Some common options are implemented using the @c IMPL_ENUM define.
///
/// - TYPE = the name of the enum
/// - DEF  = the default enum (used if no option is found)
/// - GENERAL = the name of the general option (i.e. "storagestrategy")
/// - VERTEX = speicific name for vertex attribs (i.e. "vertex:storagestrategy)
/// - POINT = specific name for point (i.e. "point:storagestrategy)
/// - PRIMITIVE = specifid name for primitive (i.e. "primitive:storagestrategy)
/// - GLOBAL = specific name for global (i.e. "global:storagestrategy)
///
/// The methods provided are:
/// @code
/// TypeStrategy        getTypeStrategy()
/// TypeStrategy        getTypeStrategy(GA_AttributeOwner owner)
/// void setTypeStrategy(TypeStrategy value)
/// void setTypeStrategy(TypeStrategy value, GA_AttributeOwner owner)
///
/// StorageStrategy     getStorageStrategy()
/// StorageStrategy     getStorageStrategy(GA_AttributeOwner owner)
/// void setStorageStrategy(StorageStrategy value)
/// void setStorageStrategy(StorageStrategy value, GA_AttributeOwner owner)
///
/// TupleSizeStrategy   getTupleSizeStrategy()
/// TupleSizeStrategy   getTupleSizeStrategy(GA_AttributeOwner owner)
/// void setTupleSizeStrategy(TupleSizeStrategy value)
/// void setTupleSizeStrategy(TupleSizeStrategy value, GA_AttributeOwner owner)
///
/// MergeStrategy       getMergeStrategy()
/// MergeStrategy       getMergeStrategy(GA_AttributeOwner owner)
/// void setMergeStrategy(MergeStrategy value)
/// void setMergeStrategy(MergeStrategy value, GA_AttributeOwner owner)
/// @endcode
///
/// List of all well defined options:
///  - [point|vertex|primitive|global:]typestrategy @n
///     What to do when the attribute type on the source & destination of the
///     merge don't match.
///  - [point|vertex|primitive|global:]storagestrategy @n
///     What to do when the attribute storage on the source & destination of the
///     merge don't match.
///  - [point|vertex|primitive|global:]tuplesizestrategy @n
///     What to do when the attribute tuple size on the source & destination of
///     the merge don't match.
///  - [point|vertex|primitive|global:]mergestrategy @n
///     What approach should be taken when laying out data in the index maps
///     when merging data.  Optimize for either space or speed.
///  - point|primitive:insert_at_head @n
///     Insert primitives/points at head of ordered list rather than appending
///  - point|primitive|vertex|edge|breakpoint:mergegroups
///     Whether to merge groups from source detail.  Defaults to true.
///  - point|primitive|vertex|edge|breakpoint:mergeinternalgroups
///     Whether to merge internal groups from source detail.  Defaults to true.
///  - point:mergeallpoints @n
///     When specifying a primitive group, by default only the points
///     referenced by the primitives will be merged.  Setting this option will
///     cause @b all points to be merged.
///  - merge:threaded
///     Perform threaded merging of data
///
class GA_API GA_MergeOptions
{
public:
    GA_MergeOptions();

    /// The @c TypeStrategy is used to give a hint to the AIFMerge if it
    /// encounters a type difference on the attributes.  For example,
    /// if the destination is a string attribute, but the source has a boolean
    /// attribute, the attribute can either keep or change the destination to
    /// match the source.
    enum TypeStrategy
    {
        /// Only process exact matches on types
        TYPE_DISALLOW,
        /// Keep destination unchanged if possible
        TYPE_KEEP_DEST,
        /// Change destination attribute to match source
        TYPE_CHANGE_DEST,

        TYPE_DEFAULT = TYPE_KEEP_DEST
    };
    /// For attributes which have storage, this enum gives a hint of what to do
    /// if there's a mis-match on storage types.
    enum StorageStrategy
    {
        /// Disallow mis-matched storage
        STORAGE_DISALLOW,
        /// Keep destination storage (casting source)
        STORAGE_KEEP_DEST,
        /// Change destination to match storage
        STORAGE_CHANGE_DEST,
        /// Use storage with greatest precision
        STORAGE_USE_BEST,

        STORAGE_DEFAULT = STORAGE_USE_BEST
    };

    /// For attributes which have a tuple size, this enum gives a hint of what
    /// to do if there's a mis-match on storage types.
    enum TupleSizeStrategy
    {
        /// Disallow mis-matched tuple sizes
        TUPLE_SIZE_DISALLOW,
        /// Use the destination tuple size
        TUPLE_SIZE_KEEP_DEST,
        /// Change destination to match source
        TUPLE_SIZE_CHANGE_DEST,
        /// Use the largest tuple size
        TUPLE_SIZE_USE_BEST,

        TUPLE_SIZE_DEFAULT = TUPLE_SIZE_USE_BEST
    };

    /// The @c MergeStrategy is used to give a hint as to how the merge should
    /// append data after the existing data or whether the source data should
    /// be interleaved with the existing data.
    /// The merge operation may change this "hint" for the actual operation.
    enum MergeStrategy
    {
        /// The optimal mode will use simple heuristics to determine whether
        /// elements should be appended or interleaved.
        MERGE_OPTIMAL,
        /// MERGE_COPY is very similar to MERGE_APPEND.  However, this is done
        /// when the original destination list has no elements allocated before
        /// the merge (i.e. the merge acts as a copy).
        MERGE_COPY,
        /// All data is appended to the end of the existing destination data.
        /// This offers attributes the opportunity to share data.
        MERGE_APPEND,
        /// In this mode, the source data is merged and mixed in with the
        /// destination data.  This will result in the most compact storage,
        /// but may result in non-shared data after the merge.
        MERGE_INTERLEAVE,

        MERGE_DEFAULT = MERGE_OPTIMAL
    };

#define IMPL_ENUM(TYPE, DEF) \
    TYPE        get##TYPE() const { \
                    if (my##TYPE[GA_ATTRIB_OWNER_N] >= 0) \
                        return my##TYPE[GA_ATTRIB_OWNER_N]; \
                    return DEF; \
                } \
    TYPE        get##TYPE(GA_AttributeOwner owner) const { \
                    if (my##TYPE[owner] >= 0) return my##TYPE[owner]; \
                    return get##TYPE(); \
                } \
    void        set##TYPE(TYPE v) { my##TYPE[GA_ATTRIB_OWNER_N] = v; } \
    void        set##TYPE(TYPE v, GA_AttributeOwner owner) { \
                    my##TYPE[owner] = v; \
                }

    IMPL_ENUM(TypeStrategy, TYPE_DEFAULT)
    IMPL_ENUM(StorageStrategy, STORAGE_DEFAULT)
    IMPL_ENUM(TupleSizeStrategy, TUPLE_SIZE_DEFAULT)
    IMPL_ENUM(MergeStrategy, MERGE_DEFAULT)

#undef IMPL_ENUM

    const GA_Range      *getSourceRange(GA_AttributeOwner owner)
                         {
                             switch (owner)
                             {
                                case GA_ATTRIB_POINT:
                                    return getSourcePointRange();
                                case GA_ATTRIB_PRIMITIVE:
                                    return getSourcePrimitiveRange();
                                default:
                                    break;
                             }
                             return 0;
                         }

    /// @{
    /// Set whether the merge should copy over group membership for the given
    /// attribute type.  By default, all groups are copied.
    ///
    /// Note that only a single type should be passed in (don't use bit-masks)
    void        setMergeGroups(GA_GroupType type, bool state)
                    { myGroupMerge[type] = state; }
    void        setAllMergeGroups(bool state)
                    {
                        for (int i = 0; i < GA_GROUP_N; ++i)
                        {
                            myGroupMerge[i] = state;
                        }
                    }
    bool        getMergeGroups(GA_GroupType type) const
                    { return myGroupMerge[type]; }
    void        setMergeInternalGroups(GA_GroupType type, bool state)
                    { myInternalGroupMerge[type] = state; }
    void        setAllMergeInternalGroups(bool state)
                    {
                        for (int i = 0; i < GA_GROUP_N; ++i)
                        {
                            myInternalGroupMerge[i] = state;
                        }
                    }
    bool        getMergeInternalGroups(GA_GroupType type) const
                    { return myInternalGroupMerge[type]; }
    /// @}

    /// @{
    /// There are two iterators that can be specified in the options.  This
    /// allows the merge operation to operate on a subset of primitives &
    /// points.
    /// - If neither range is set, all source primitives, vertices and points
    ///   will be merged.
    /// - If the primitive range is set, only the primitives in the range will
    ///   be merged.  Only the points used by the primitives will be merged
    ///   unless the bool option: "point:mergeallpoints" is set.
    /// - If the point range is set, no primitives will be merge, and only the
    ///   points in the range will be merged.
    const GA_Range      *getSourcePointRange() const
                            { return myPointRange.getRTI()
                                ? &myPointRange : (const GA_Range *)NULL; }
    const GA_Range      *getSourcePrimitiveRange() const
                            { return myPrimitiveRange.getRTI()
                                ? &myPrimitiveRange : (const GA_Range *)NULL; }

    void                 setSourcePrimitiveRange(const GA_Range &range)
                            { myPrimitiveRange = range; }
    void                 setSourcePointRange(const GA_Range &range)
                            { myPointRange = range; }
    /// @}

    /// @{
    /// For backward compatibility with the GEO library, we provide a method to
    /// control the "mapping" from source primitives to the newly
    /// created merged primitives.
    void                  setPrimitiveMap(UT_Array<GA_Primitive*> *prims);
    UT_Array<GA_Primitive*> *getPrimitiveMap() const 
                            { return myPrimitiveMap; }
    /// @}

    /// @{
    /// Whether to perform threaded merging of attributes
    /// Default: true
    bool        mergeThreaded() const { return myMergeThreaded; }
    void        setMergeThreaded(bool v) { myMergeThreaded = v; }
    /// @}

    /// @{
    /// Whether to compute missing normal attributes if they are on
    /// one of the geometries and not the other.
    /// Default: true
    bool        mergeComputeMissingNormals() const { return myMergeComputeMissingNormals; }
    void        setMergeComputeMissingNormals(bool v) { myMergeComputeMissingNormals = v; }
    /// @}

    /// @{
    /// When merging a range of primitives, check whether to merge @b all
    /// points (or just the referenced points).
    /// Default: false
    bool        mergeAllPoints() const { return myMergeAllPoints; }
    void        setMergeAllPoints(bool v) { myMergeAllPoints = v; }
    /// @}

    /// @{
    /// Whether to insert points at the head when merging.
    /// Default: false
    bool        mergePointsAtHead() const { return myMergePointsAtHead; }
    void        setMergePointsAtHead(bool v) { myMergePointsAtHead = v; }
    /// @}

    /// @{
    /// Whether to insert primitives at the head when merging.
    /// Default: false
    bool        mergePrimitivesAtHead() const { return myMergePrimitivesAtHead;}
    void        setMergePrimitivesAtHead(bool v) { myMergePrimitivesAtHead=v; }
    /// @}

    /// @{
    /// Merge the input detail multiple times.
    GA_Size     mergeCount() const              { return myMergeCount; }
    void        setMergeCount(GA_Size nmerges)
                {
                    myMergeCount = SYSmax(1, nmerges);
                    if (myMergeCount > 1)
                        myForceInterleaved = true;
                }
    /// @}

    /// @{
    /// Whether the "copy" style of merging should force interleaving instead
    /// of verbatim copying.  This is often useful when merging multiple
    /// different details.
    bool        forceInterleaved() const        { return myForceInterleaved; }
    void        setForceInterleaved(bool v)     { myForceInterleaved = v; }
    /// @}
 
    /// @{
    /// Strategy to use for attribute data ids during the merge, defaulting
    /// to GA_DATA_ID_BUMP.  GA_DATA_ID_CLONE is useful when copying a source
    /// detail in order to perform a partial update without always blindly
    /// invalidating any external caches tied to data ids.  The data id must
    /// be manually bumped when an attribute is later modified.
    GA_DataIdStrategy    getAttributeDataIdStrategy() const
                                        { return myAttributeDataIdStrategy; }
    void                 setAttributeDataIdStrategy(GA_DataIdStrategy s)
                                        { myAttributeDataIdStrategy = s; }
    /// @}

    /// @{
    /// Strategy to use for handling point attributes and vertex attributes
    /// of the same name, defaulting to override a previous point/vertex
    /// attribute with the requested vertex/point attribute.
    const GA_ReuseStrategy &getReuseStrategy() const
    { return myReuseStrategy; }
    void setReuseStrategy(const GA_ReuseStrategy &reuse)
    { myReuseStrategy = reuse; }
    /// }

private:
    TypeStrategy         myTypeStrategy[GA_ATTRIB_OWNER_N + 1];
    StorageStrategy      myStorageStrategy[GA_ATTRIB_OWNER_N + 1];
    TupleSizeStrategy    myTupleSizeStrategy[GA_ATTRIB_OWNER_N + 1];
    MergeStrategy        myMergeStrategy[GA_ATTRIB_OWNER_N + 1];

    UT_Array<GA_Primitive*>      *myPrimitiveMap;
    GA_Range                      myPrimitiveRange;
    GA_Range                      myPointRange;
    GA_Size                       myMergeCount;
    GA_DataIdStrategy             myAttributeDataIdStrategy;
    GA_ReuseStrategy              myReuseStrategy;
    bool                          myGroupMerge[GA_GROUP_N];
    bool                          myInternalGroupMerge[GA_GROUP_N];
    bool                          myForceInterleaved;
    bool                          myMergeThreaded;
    bool                          myMergeComputeMissingNormals;
    bool                          myMergeAllPoints;
    bool                          myMergePointsAtHead;
    bool                          myMergePrimitivesAtHead;
};

#endif