シェーダー関数でタイル

Tile.metal

#include <metal_stdlib>
using namespace metal;

[[ stitchable ]] half4 tile(float2 position, half4 color, float4 box, float scale) {
    position = position - box.zw/2;
    position = position / (10 * scale);
    int2 xy = int2(floor(position)) % 2;
    if ((xy.x + xy.y) % 2) {
        return half4(0.0, 0.0, 0.0, 1.0);
    } else {
        return half4(1.0, 1.0, 1.0, 1.0);
    }
}

Tile.swift

import SwiftUI

struct ContentView: View {
    @State private var start = Date()

    var body: some View {
        TimelineView(.animation) { context in
            let time = context.date
                .timeIntervalSince(start)
            let scale = 1 + 10 * (sin(time) + 1)
            Rectangle()
                .colorEffect(shader(scale: scale))
                .foregroundStyle(.white)
                .ignoresSafeArea()
        }
    }

    func shader(scale: Double) -> Shader {
        ShaderLibrary
            .tile(.boundingRect, .float(scale))
    }
}

#Preview {
    ContentView()
}