Wrapper around visionOS 2 volumeWorldAlignment that is a no-op in visionOS 1

VolumeWorldAlignment_visionOS2.swift

//
//  VolumeWorldAlignment_visionOS2.swift
//
//  Created by Drew Olbrich on 6/15/24.
//  Copyright © 2024 Lunar Skydiving LLC. All rights reserved.
//
//  MIT License
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.
//

import SwiftUI

enum WorldAlignmentBehavior_visionOS2 {
    case adaptive
    case automatic
    case gravityAligned
}

extension Scene {

    /// A wrapper around `volumeWorldAlignment` that applies it only on visionOS 2 and
    /// later, and is a no-op on visionOS 1.
    ///
    /// This is necessary because there doesn't appear to be an easy way to
    /// conditionally apply SwiftUI view modifiers or scene modifiers for specific OS
    /// versions.
    func volumeWorldAlignment_visionOS2(_ worldAlignmentBehavior: WorldAlignmentBehavior_visionOS2) -> some Scene {
        if #available(visionOS 2.0, *) {
            let worldAlignmentBehavior: WorldAlignmentBehavior = switch worldAlignmentBehavior {
            case .adaptive:
                .adaptive
            case .automatic:
                .automatic
            case .gravityAligned:
                .gravityAligned
            }
            return self.volumeWorldAlignment(worldAlignmentBehavior)
        } else {
            return self
        }
    }
    
}