tests/sksl/shared/golden/VertexID.metal

#include <metal_stdlib>
#include <simd/simd.h>
using namespace metal;
struct Inputs {
};
struct Outputs {
    float4 sk_Position [[position]];
    int id  [[user(locn-1)]];
    float sk_PointSize [[point_size]];
};

vertex Outputs vertexMain(Inputs _in [[stage_in]], uint sk_VertexID [[vertex_id]], uint sk_InstanceID [[instance_id]]) {
    Outputs _outputStruct;
    thread Outputs* _out = &_outputStruct;
    _out->id = sk_VertexID;
    _out->sk_Position.y = -_out->sk_Position.y;
    return *_out;
}