int intMin         = -2147483648;
int intMinMinusOne = -2147483649;
int intMax         = 2147483647;
int intMaxPlusOne  = 2147483648;

void main() {
    sk_FragColor.x = half(intMin);
    sk_FragColor.x = half(intMax);
    sk_FragColor.x = half(intMinMinusOne);
    sk_FragColor.x = half(intMaxPlusOne);
}