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// Copyright 2016 The Draco Authors.
//
// 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 DRACO_MESH_TRIANGLE_SOUP_MESH_BUILDER_H_
#define DRACO_MESH_TRIANGLE_SOUP_MESH_BUILDER_H_
#include "draco/draco_features.h"
#include "draco/mesh/mesh.h"
namespace draco {
// Class for building meshes directly from attribute values that can be
// specified for each face corner. All attributes are automatically
// deduplicated.
class TriangleSoupMeshBuilder {
public:
// Starts mesh building for a given number of faces.
// TODO(ostava): Currently it's necessary to select the correct number of
// faces upfront. This should be generalized, but it will require us to
// rewrite our attribute resizing functions.
void Start(int num_faces);
// Adds an empty attribute to the mesh. Returns the new attribute's id.
int AddAttribute(GeometryAttribute::Type attribute_type,
int8_t num_components, DataType data_type);
// Sets values for a given attribute on all corners of a given face.
void SetAttributeValuesForFace(int att_id, FaceIndex face_id,
const void *corner_value_0,
const void *corner_value_1,
const void *corner_value_2);
// Sets value for a per-face attribute. If all faces of a given attribute are
// set with this method, the attribute will be marked as per-face, otherwise
// it will be marked as per-corner attribute.
void SetPerFaceAttributeValueForFace(int att_id, FaceIndex face_id,
const void *value);
// Finalizes the mesh or returns nullptr on error.
// Once this function is called, the builder becomes invalid and cannot be
// used until the method Start() is called again.
std::unique_ptr<Mesh> Finalize();
private:
std::vector<int8_t> attribute_element_types_;
std::unique_ptr<Mesh> mesh_;
};
} // namespace draco
#endif // DRACO_MESH_TRIANGLE_SOUP_MESH_BUILDER_H_
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