shader_type sky;

uniform sampler2D base;
uniform vec3 base_color : source_color;
uniform float base_speed : hint_range(0,1) = 0.1;

uniform sampler2D layer;
uniform sampler2D layer_two;

uniform float NOISE : hint_range(0,1) = 0.5;

float random(vec2 coords) {
   return fract(sin(dot(coords.xy, vec2(12.9898,78.233))) * 43758.5453);
}

void sky() {
	float NOISE_GRANULARITY = NOISE / 100.0;
	
	vec2 base_coords = vec2(SKY_COORDS.x+TIME*base_speed*0.05, SKY_COORDS.y);
	vec4 base_pix = texture(base, base_coords);
	float noise = mix(-NOISE_GRANULARITY, NOISE_GRANULARITY, random(base_coords));
	float base_alpha = base_pix.a;
	//if (base_alpha < 0.01 && base_alpha > 0.0) {
		//base_alpha += noise;
	//}
	
	vec2 star_coords = vec2(SKY_COORDS.x-TIME*base_speed*0.05, SKY_COORDS.y);
	vec4 star_pix = texture(layer_two, star_coords)*0.5;
	
	vec2 galaxy_coords = vec2(SKY_COORDS.x-TIME*base_speed*0.01, SKY_COORDS.y);
	vec4 galaxy_pix = max(vec4(0,0,0,0),texture(layer, galaxy_coords));
	COLOR = vec3(0,0,0) + star_pix.rgb * star_pix.a + base_pix.rgb * base_alpha + + galaxy_pix.rgb * galaxy_pix.a;
	// Called for every visible pixel in the sky background, as well as all pixels
	// in the radiance cubemap.
}