struct SpotLightSource {
    vec3 position;
    vec3 color;
    vec3 ambientColor;
    float attenuation;
    float gradient;
    float specularFactor;
};

struct DiretionalLightSource {
    vec3 position;
    vec3 direction;
    float directionGradient;
    vec3 color;
    vec3 ambientColor;
    float attenuation;
    float gradient;
    float specularFactor;
};