HUSD_BindMaterial.h

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/*
 * Copyright 2019 Side Effects Software Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef __HUSD_BindMaterial__
#define __HUSD_BindMaterial__

#include "HUSD_API.h"
#include "HUSD_DataHandle.h"


class HUSD_API HUSD_BindMaterial
{
public:
    /// Standard constructor.
                 HUSD_BindMaterial(HUSD_AutoWriteLock &lock);

    /// Assigns the given material to the given geometry primitive(s).
    bool        bind(const UT_StringRef &mat_prim_path,
                        const UT_StringRef &geo_prim_path) const;
    bool        bind(const UT_StringRef &mat_prim_path,
                        const HUSD_FindPrims &find_geo_prims) const;

    /// Performs a collection based binding with explicit values for the
    /// collection path, binding prim path, and binding name. The bind
    /// method and bind prim path set on this object are ignored.
    bool        bindAsCollection(const UT_StringRef &mat_prim_path, 
                        const UT_StringRef &collection_path,
                        const UT_StringRef &binding_prim_path,
                        const UT_StringRef &binding_name) const;

    /// Assigns the given material a subset of the geometry primitive. This
    /// method creates the geometry subset. If a geometry subset already
    /// exists, it can be bound using the regular bind methods above.
    bool        bindSubset(const UT_StringRef &mat_prim_path, 
                        const UT_StringRef &geo_prim_path,
                        const UT_ExintArray *face_indices) const;

    /// Enumeration of the ways in which a binding can be performed.
    enum class BindMethod
    {
        DIRECT,         // direct binding
        COLLECTION      // collection-based binding
    };

    /// Sets the method of defining bindings.
    void                        setBindMethod( BindMethod method )
                                { myBindMethod = method; }
    BindMethod                  getBindMethod() const 
                                { return myBindMethod; }

    /// For non-direct bindings, sets the USD primitive path on which the 
    /// collection-based binding is defined.
    void                        setBindPrimPath( const UT_StringRef &p)
                                { myBindPrimPath = p; }
    const UT_StringHolder &     getBindPrimPath() const 
                                { return myBindPrimPath; }

    /// Enumeration of the material binding strength.
    enum class Strength
    {
        DEFAULT,        // fallback
        STRONG,         // stronger than descendents
        WEAK            // weaker than descendents
    };

    /// Sets the strength preference for material assignments.
    void                        setStrength( Strength strength )
                                { myStrength = strength; }
    Strength                    getStrength() const 
                                { return myStrength; }

    /// Sets the purpose for material assignments.
    void                        setPurpose( const UT_StringHolder &purpose )
                                { myPurpose = purpose; }
    const UT_StringHolder &     getPurpose() const 
                                { return myPurpose; }

private:
    HUSD_AutoWriteLock &        myWriteLock;
    BindMethod                  myBindMethod;           // Collection based?
    Strength                    myStrength;             // Binding strength
    UT_StringHolder             myPurpose;              // Binding purpose
    UT_StringHolder             myBindPrimPath;         // Collection location
};

#endif