Utilize `simd` to synchronize your alignment:

<!-- language: lang-swift -->
    import simd
    
    private struct BoundingBoxParameters {
    
        let topLeft: float2 = float2(0.0, 0.0)
        let size: float2 = float2(0.0, 0.0)
        let levelOfDetail: Float = 1.0

        init(topLeft: float2,
             size: float2,
             levelOfDetail: Float) {
            self.topLeft = topLeft
            self.size = size 
            self.levelOfDetail = levelOfDetail
        }
    }