/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 A couple extensions for simd types.

 */

import Foundation

import simd

extension simd_float2 {

    static let zero = simd_float2(0.0, 0.0)

    func allZero() -> Bool {

        return x == 0 && y == 0

    }

    static func ==(left: simd_float2, right: simd_float2) -> simd_int2 {

        return simd_int2(left.x == right.x ? -1: 0, left.y == right.y ? -1: 0)

    }

}

extension simd_float3 {

    static let zero = simd_float3(0.0, 0.0, 0.0)

    func allZero() -> Bool {

        return x == 0 && y == 0 && z == 0

    }

    static func ==(left: simd_float3, right: simd_float3) -> simd_int3 {

        return simd_int3(left.x == right.x ? -1: 0, left.y == right.y ? -1: 0, left.z == right.z ? -1: 0)

    }

    static func !=(left: simd_float3, right: simd_float3) -> simd_int3 {

        return simd_int3(left.x != right.x ? -1: 0, left.y != right.y ? -1: 0, left.z != right.z ? -1: 0)

    }

}

extension simd_float4 {

    static let zero = simd_float4(0.0, 0.0, 0.0, 0.0)

    static func ==(left: simd_float4, right: simd_float4) -> simd_int4 {

        return simd_int4(left.x == right.x ? -1: 0, left.y == right.y ? -1: 0, left.z == right.z ? -1: 0, left.w == right.w ? -1: 0)

    }

    var xyz: simd_float3 {

        get {

            return simd_float3(x, y, z)

        }

        set {

            x = newValue.x

            y = newValue.y

            z = newValue.z

        }

    }

}

extension simd_float4x4 {

    var position: simd_float3 {

        get {

            return columns.3.xyz

        }

        set {

            columns.3.xyz = newValue

        }

    }

}