[gd_scene load_steps=10 format=2]

[sub_resource type="Shader" id=1]
code = "shader_type spatial;
render_mode unshaded;

uniform vec4 deep_color : hint_color;
uniform vec4 shallow_color : hint_color = vec4(1);

uniform float refraction_speed = 0.25;
uniform float refraction_strength = 1.0;

uniform float foam_amount = 1.0;
uniform float foam_cutoff = 1.0;
uniform vec4 foam_color : hint_color = vec4(1);

uniform float displacement_strength = 0.25;

uniform float depth_distance = 1.0;

uniform vec2 movement_direction = vec2(1,0);

uniform sampler2D refraction_noise : hint_normal;
uniform sampler2D foam_noise : hint_black_albedo;
uniform sampler2D displacement_noise : hint_black;

void vertex() {
	float displacement = textureLod(
			displacement_noise, 
			UV + (TIME * movement_direction) * refraction_speed, 
			0.0).r * 2.0 - 1.0;
	
	VERTEX.y += displacement * displacement_strength;
}

void fragment() {
	vec2 uv = SCREEN_UV + refraction_strength 
			* (texture(refraction_noise, UV + (TIME * movement_direction) * refraction_speed).rg 
			* 2.0 - 1.0);
	
	float real_depth = texture(DEPTH_TEXTURE, SCREEN_UV).r * 2.0 - 1.0;
	real_depth = PROJECTION_MATRIX[3][2] / (real_depth + PROJECTION_MATRIX[2][2]) + VERTEX.z;
	
	// Get the raw linear depth from the depth texture into a  [-1, 1] range
	float depth = texture(DEPTH_TEXTURE, uv).r * 2.0 - 1.0;
	// Recreate linear depth of the intersecting geometry using projection matrix, and subtract the vertex of the sphere
	depth = PROJECTION_MATRIX[3][2] / (depth + PROJECTION_MATRIX[2][2]) + VERTEX.z;
	
	depth = max(depth, real_depth);
	
	float intersection = clamp(depth / foam_amount, 0, 1) * foam_cutoff;
	
	vec4 out_color = mix(shallow_color, deep_color, clamp((depth / depth_distance), 0, 1));
	vec4 scene_color = texture(SCREEN_TEXTURE, uv);
	out_color = mix(scene_color, out_color, out_color.a);
	
	vec3 foam = step(intersection, 
			texture(foam_noise, UV + (TIME * movement_direction) * refraction_speed).rgb) 
			* foam_color.rgb;
	
	ALBEDO = out_color.rgb + foam;
}"

[sub_resource type="OpenSimplexNoise" id=4]

[sub_resource type="NoiseTexture" id=5]
flags = 3
width = 1024
height = 1024
noise = SubResource( 4 )

[sub_resource type="OpenSimplexNoise" id=6]

[sub_resource type="NoiseTexture" id=7]
width = 1024
height = 1024
noise = SubResource( 6 )

[sub_resource type="OpenSimplexNoise" id=8]

[sub_resource type="NoiseTexture" id=9]
width = 1024
height = 1024
noise = SubResource( 8 )

[sub_resource type="ShaderMaterial" id=2]
shader = SubResource( 1 )
shader_param/deep_color = Color( 0.00784314, 0, 0.196078, 1 )
shader_param/shallow_color = Color( 0.65098, 1, 1, 1 )
shader_param/refraction_speed = 0.25
shader_param/refraction_strength = 1.0
shader_param/foam_amount = 1.0
shader_param/foam_cutoff = 1.0
shader_param/foam_color = Color( 1, 1, 1, 1 )
shader_param/displacement_strength = 0.25
shader_param/depth_distance = 5.0
shader_param/movement_direction = Vector2( 1, 0 )
shader_param/refraction_noise = SubResource( 9 )
shader_param/foam_noise = SubResource( 7 )
shader_param/displacement_noise = SubResource( 5 )

[sub_resource type="PlaneMesh" id=3]
material = SubResource( 2 )
subdivide_width = 512
subdivide_depth = 512

[node name="Spatial" type="Spatial"]

[node name="MeshInstance" type="MeshInstance" parent="."]
transform = Transform( 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.182733, -0.0156302 )
mesh = SubResource( 3 )

[node name="OmniLight" type="OmniLight" parent="."]
transform = Transform( 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.336934, 0 )
omni_range = 0.949787