GT_CatPolygonMesh.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_CatPolygonMesh.h (GT Library, C++)
 *
 * COMMENTS:
 */

#ifndef __GT_CatPolygonMesh__
#define __GT_CatPolygonMesh__

#include "GT_API.h"
#include "GT_Handles.h"
#include <UT/UT_Array.h>

class GT_PrimPolygonMesh;

/// Concatenate GT_PrimPolygonMesh objects into a single GT_PrimPolygonMesh
class GT_API GT_CatPolygonMesh
{
public:
    GT_CatPolygonMesh(bool merge_detail_attribs = true,
                      int64 total_num_faces = SYS_INT64_MAX,
                      int64 max_meshes = SYS_INT64_MAX,
                      int64 max_mesh_face_count = SYS_INT64_MAX);

    GT_CatPolygonMesh(const UT_Array<GT_PrimitiveHandle> &meshes,
                      bool merge_detail_attribs = true);

    /// If 'merge_detail_attribs' is true, the detail lists will be promoted
    /// to uniform attributes. If false, only the first meshes detail attribs
    /// are used (useful for merging meshes built from the same GU_Detail).
    /// default is to merge.
    void        mergeDetailLists(bool merge_detail_lists)
                    { myMergeDetailLists = merge_detail_lists; }

    /// Limit the # of faces in the mesh. append will return false once full.
    void        setTotalFaceCount(int64 max_num_faces)
                    { myTotalFaceCount = max_num_faces; }
    /// Limit the # of consituent meshes in the mesh. append will return false
    /// once full.
    void        setMaxMeshCount(int64 max_meshes)
                    { myMaxMeshCount = max_meshes; }
    /// Don't allow meshes larger than this size to be added.
    void        setMaxMeshFaceCount(int64 max_faces)
                    { myMaxMeshFaceCount = max_faces; }

    enum gt_CatAppendReason
    {
        APPEND_OK,
        APPEND_UNSUPPORTED_TYPE,// not a poly mesh
        APPEND_TOO_MANY_MESHES, // collected mesh exceeds the mesh count
        APPEND_TOO_MANY_FACES,  // collected mesh exceeds total #faces
        APPEND_NO_FACES,        // mesh has no faces
        APPEND_MESH_TOO_LARGE,  // mesh exceeds max mesh face count
        APPEND_ATTRIB_MISMATCH  // mesh attributes don't match collected mesh's
    };

    /// Test if the primitive can be added, without adding it.
    bool        canAppend(const GT_PrimitiveHandle &prim,
                          gt_CatAppendReason *reason = NULL) const;
    
    /// Append a polygon mesh.  Returns false if the primitive isn't valid
    bool        append(const GT_PrimitiveHandle &prim);

    /// Append a polygon mesh.  Returns false if the primitive isn't valid
    bool        append(const GT_PrimitiveHandle &prim,
                       const GT_TransformHandle &prim_transform);
    /// Replace mesh at the index with a new mesh.
    bool        replace(int idx,
                        const GT_PrimitiveHandle &prim);
    // Remove the mesh at index.
    bool        remove(int idx);

    /// Clear the mesh at index, without shifting the list.
    bool        clearMesh(int idx);

    /// Reset and release all meshes.
    void        clearAllMeshes(); 

    const GT_PrimPolygonMesh    *getMesh(exint i) const;

    exint       getNumSourceMeshes() const { return myNumSourceMeshes; }
    int64       getNumSourceFaces() const { return myFaceCount; }

    /// Return the concatenation of all the polygon meshes
    GT_PrimitiveHandle  result(GT_AttributeListHandle detail_list = 0) const;

private:
    bool        matchAttributes(const GT_PrimPolygonMesh &pmesh) const;
    void        mergeDetailLists(const UT_Array<GT_PrimitiveHandle> &meshes,
                                 GT_AttributeListHandle &uniform,
                                 GT_AttributeListHandle &detail) const;

    UT_Array<GT_PrimitiveHandle>        myMeshes;
    int                                 myNumSourceMeshes;
    bool                                myMergeDetailLists;
    int                                 myIsSubdivision; 
    int64                               myFaceCount;
    int64                               myTotalFaceCount;
    int64                               myMaxMeshCount;
    int64                               myMaxMeshFaceCount;
};

#endif