struct Input_ {
    float4 color_ : COLOR0;
    float3 normal_ : TEXCOORD0;
    float3 light_ : TEXCOORD1;
    float3 camera_ : TEXCOORD2;
};

struct Output_ {
    float4 color_ : COLOR;
};

Output_ main(
    in Input_ input
) {
    Output_ output;
    float diffuse = dot(-input.light_, input.normal_);
    diffuse = 1.0f - step(diffuse, 0.3f) * 0.2f;
    float specular = dot(reflect(input.light_, input.normal_), input.camera_);
    specular = step(0.7f, specular);
    specular *= step(0, diffuse);
    diffuse = max(0, diffuse);
    float edge = step(0.25f, dot(input.normal_, input.camera_));
    output.color_ = (diffuse * input.color_ + specular) * edge;
    return output;
}