third_party/skia/resources/sksl/metal/CastMat4x4ToMat3x4.sksl

void main() {
    float3x4 a = float3x4(1);
    float3x4 b = float3x4(float4x4(1));
    sk_FragColor.x = (a[0] == b[0]) ? 0 : 1;
}