#include <metal_stdlib>
#include <simd/simd.h>
using namespace metal;
struct Inputs {
float a;
};
struct Outputs {
float4 sk_FragColor [[color(0)]];
fragment Outputs fragmentMain(Inputs _in [[stage_in]], bool _frontFacing [[front_facing]], float4 _fragCoord [[position]]) {
Outputs _out;
_out.sk_FragColor.x = acos(_in.a);
return _out;
}