struct Input_ {
    float3 normal_ : TEXCOORD0;
    float3 incident_ : TEXCOORD1;
};

struct Output_ {
    float4 color_ : COLOR;
};

Output_ main(
    in Input_ input,
    uniform samplerCUBE environment
) {
    Output_ output;
    float4 reflected = texCUBE(environment, reflect(input.incident_, input.normal_));
    float4 refracted = texCUBE(environment, refract(input.incident_, input.normal_, 1.5f));
    float coefficient = clamp(0.3f + 0.4f * (1 + dot(input.incident_, input.normal_)), 0.0f, 1.0f);
    output.color_ = lerp(refracted, reflected, coefficient);
    return output;
}