varying vec2 uv;
uniform sampler2D texture;
uniform float age, time;
varying vec3 n, v, norm;

vec3 rangeUnpack(float t) {
	vec3 r;
	r.x = abs(mod(t + 0.33333,1.0) - 0.5) / 0.5;
	r.y = abs(mod(t + 0.66666,1.0) - 0.5) / 0.5;
	r.z = abs(mod(t + 1.0,1.0) - 0.5) / 0.5;
	return r;
}

void main() {
	vec3 sample = texture2D(texture,uv).rgb;
	sample = sample * rangeUnpack(mod(age * 15.0, 1.0));
	float alpha = max(sample.x + sample.y + sample.z - 0.7, 0.0);
	alpha *= max(dot(normalize(norm), normalize(-v)), 0.0) * (1.0 - abs(n.y)) * (1.0 - age);
	alpha *= 20.0;
	if(alpha <= 0.0)
		discard;
		
	gl_FragColor.rgb = alpha * vec3(1.0, 0.7, 0.2);
	gl_FragColor.a = 1.0;
}