precision highp float;
attribute vec3 stars;
uniform float time;
uniform float world_x;
uniform float world_y;
uniform float world_x_period;
uniform float world_y_period;
uniform vec4 lamp1;
uniform vec4 lamp2;
uniform vec4 lamp3;
uniform vec4 lamp4;
uniform vec4 lamp5;
uniform vec4 lamp6;
uniform vec4 lamp7;
uniform vec4 lamp8;
uniform mat4 MV;
uniform mat4 P;
void main() {
	float world_x_off = mod(world_x, world_x_period);
	float world_y_off = mod(world_y, world_y_period);
	vec4 pos = P * MV * vec4(stars.x - world_x_off, stars.y - world_y_off, -0.1, 1.0);
	gl_Position = pos;
	float intensity = sin(stars.z + time) * cos(time) + 1.;
	/*
	if(distance(pos.xyz, lamp1.xyz) < 80.)
		intensity = 0.;
	*/
	gl_PointSize = pow(intensity, 2.) * stars.z * 0.3;
	//gl_PointSize = distance(pos.xyz, lamp1.xyz);
}