1
2out vec4 sk_FragColor;
3void main() {
4    int x = 0;
5    int y = 0;
6    int z = 0;
7    x = 1;
8    y = 1;
9    z = 1;
10    sk_FragColor.xyz = vec3(float(x), float(y), float(z));
11}
12