​

varying vec2 pos;

​

void main() {

  float strength = pos.x;

  float durability = pos.y;

  // if strength is greater than durability, do full strength damage

  float strengthGreaterMask = step(durability, strength);

  float maxDurability = step(1.0, durability); // if durability is max => no damage

​

  float damage = strengthGreaterMask + ((1.-strengthGreaterMask) * (strength/durability));

  damage *= (1. - maxDurability);

  gl_FragColor = vec4(damage, damage, damage, 1.0);

}

​