SimpleMesh.swift

// Color is (r, g, b, a) components
static func complexPlane() -> [VertexIn] {
    var result: [VertexIn] = []
    let size = SIMD2<Float>(10, 2)
    for x in stride(from: 0, to: size.x, by: 1) {
        for y in stride(from: 0, to: size.y, by: 1) {
            let position = SIMD3(.init(x / size.x, y).metal, 0)
            result.append(
                .init(position: .init(position, 1),
                      color: .init(1, 1, 1, 1))
            )
        }
    }
    return result
}

private extension SIMD2<Float> {
    // Converts from origin at topLeft to origin at center of the screen
    var toMetalGeometry: SIMD2<Float> {
        .init(x * 2 - 1, (1 - y) * 2 - 1)
    }
}