void main() {
  half2x2 m1 = half2x2(half4(1, 2, 3, 4));
  half2x2 m2 = half2x2(float4(1, 2, 3, 4));
  float2x2 m3 = float2x2(half4(1, 2, 3, 4));
  float2x2 m4 = float2x2(float4(1, 2, 3, 4));

  sk_FragColor = (m1 * m2 * half2x2(m3 * m4)[0]).xyxy;
}