shader_type spatial;
render_mode cull_disabled;
render_mode specular_toon;
// render_mode wireframe;

uniform vec3 color : source_color = vec3(0.055, 0.286, 0.62);
uniform vec3 fresnel_color : source_color = vec3(0.141, 0.447, 0.902);
uniform float fresnel_reduction = 5.0;
uniform float roughness : hint_range(0.0, 1.0) = 0.02;
uniform sampler2D height_map;
uniform sampler2D normal_map;
uniform float height_scale = 0.0;
uniform float noise_scale = 0.5;

varying vec2 noise_position;

float get_fresnel(float power, vec3 normal, vec3 view) {
	return pow((1.0 - clamp(dot(normalize(normal), normalize(view)), 0.0, 1.0)), power);
}

void vertex() {
	noise_position = VERTEX.xz * noise_scale + 0.5;
	float height = texture(height_map, noise_position).x - 0.5;
	VERTEX.y += height * height_scale;
}

void fragment() {
	// NORMAL_MAP = texture(normal_map, UV).rgb;
	NORMAL_MAP = texture(normal_map, noise_position).xyz;
	
	float fresnel = get_fresnel(fresnel_reduction, NORMAL, VIEW);
	RIM = 0.2;
	METALLIC = 0.0;
	ROUGHNESS = roughness * fresnel;
	ALBEDO = mix(color, fresnel_color, fresnel);
}