shader_type spatial;
render_mode cull_back;

uniform vec4 color_1: source_color = vec4(0.0, 0.03, 0.1, 1.0);
uniform vec4 color_2: source_color = vec4(0.0, 0.1, 0.3, 1.0);
uniform float roughness: hint_range(0.0, 1.0) = 0.15;
uniform float specular_contribution = 0.2;

uniform sampler2D gunk_mask;

uniform highp sampler2D gunk_noise;
uniform highp sampler2D gunk_normal_map;


void fragment() {
	float value = texture(gunk_noise, UV).r;
	vec4 color = mix(color_1, color_2, value);
	float roughness_mix = value * roughness;

	ALBEDO = color.rgb;
	ROUGHNESS = roughness_mix;
	SPECULAR = 0.5 * inversesqrt(specular_contribution);
	NORMAL_MAP = texture(gunk_normal_map, UV).xyz;
	ALPHA = 1.0 - texture(gunk_mask, UV).r;
}