mesh_to_xatlas.h

/*
 * Copyright 2026 Adobe. All rights reserved.
 * This file is licensed to you 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 REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
#pragma once
 
#include <lagrange/SurfaceMesh.h>
#include <lagrange/xatlas/Options.h>
 
#include <cstdint>
#include <string_view>
#include <vector>
 
#include <xatlas/xatlas.h>
 
namespace lagrange::xatlas::internal {

struct MeshAdapter
{
    std::vector<float> positions;

    std::vector<float> normals;

    std::vector<float> uvs;

    std::vector<uint32_t> indices;

    uint32_t vertex_count = 0;

    uint32_t face_count = 0;

    ::xatlas::MeshDecl as_decl() const noexcept;
};

template <typename Scalar, typename Index>
MeshAdapter build_mesh_adapter(
    const SurfaceMesh<Scalar, Index>& mesh,
    const UnwrapOptions& options);

struct UvMeshAdapter
{
    std::vector<float> uvs;

    std::vector<uint32_t> indices;

    std::vector<uint32_t> face_materials;

    uint32_t vertex_count = 0;

    uint32_t face_count = 0;

    ::xatlas::UvMeshDecl as_decl() const noexcept;
};

template <typename Scalar, typename Index>
UvMeshAdapter build_uv_mesh_adapter(
    const SurfaceMesh<Scalar, Index>& mesh,
    std::string_view uv_attribute_name,
    std::string_view chart_attribute_name);
 
} // namespace lagrange::xatlas::internal