Added voronoi based biome experiments.

materials/shader/VoronoiBasedBiomes2D.gdshader

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+shader_type canvas_item;
+
+uniform vec4 DeepWaterColor : hint_color = vec4(0, 0, 0.6, 1);
+uniform vec4 WaterColor : hint_color = vec4(0, 0, 0.7, 1);
+uniform vec4 LightWaterColor : hint_color = vec4(0, 0, 1, 1);
+uniform vec4 SandColor : hint_color = vec4(0.8, 0.8, 0.1, 1);
+uniform vec4 GrassColor : hint_color = vec4(0, 0.6, 0, 1);
+uniform vec4 ForestColor : hint_color = vec4(0, 0.4, 0, 1);
+uniform vec4 RockColor : hint_color = vec4(0.5, 0.5, 0.4, 1);
+uniform vec4 SnowColor : hint_color = vec4(1);
+
+vec2 rand2d(vec2 uv) {
+	return vec2(fract(sin(dot(uv.xy,
+		vec2(12.9898,78.233))) * 43758.5453123));
+}
+
+float rand1d(vec2 uv){
+    return fract(sin(dot(uv, vec2(12.9898, 78.233))) * 43758.5453);
+}
+
+vec2 voronoi_segment(vec2 uv, float columns, float rows) {
+	vec2 index_uv = floor(vec2(uv.x * columns, uv.y * rows));
+	vec2 fract_uv = fract(vec2(uv.x * columns, uv.y * rows));
+	
+	float minimum_dist = 1.0;
+	vec2 minimum_point;
+	vec2 minimum_neighbour;
+	
+	for (int y = -1; y <= 1; y++) {
+		for (int x = -1; x <= 1; x++) {
+			vec2 neighbour = vec2(float(x), float(y));
+			vec2 point = rand2d(index_uv + neighbour);
+			
+			vec2 diff = neighbour + point - fract_uv;
+			float dist = length(diff);
+			
+			if (dist < minimum_dist) {
+				minimum_dist = dist;
+				minimum_point = point;
+				minimum_neighbour = neighbour;
+			}
+		}
+	}
+	
+	return minimum_point;
+}
+
+ivec2 voronoiCellId(vec2 uv, vec2 grid_size) {
+	vec2 index_uv = floor(uv * grid_size);
+	vec2 fract_uv = fract(uv * grid_size);
+	
+		float minimum_dist = 1.0;
+	vec2 minimum_point;
+	vec2 minimum_neighbour;
+	
+	for (int y = -1; y <= 1; y++) {
+		for (int x = -1; x <= 1; x++) {
+			vec2 neighbour = vec2(float(x), float(y));
+			vec2 point = rand2d(index_uv + neighbour);
+			
+			vec2 diff = neighbour + point - fract_uv;
+			float dist = length(diff);
+			
+			if (dist < minimum_dist) {
+				minimum_dist = dist;
+				minimum_point = point;
+				minimum_neighbour = index_uv + neighbour;
+			}
+		}
+	}
+	
+	return ivec2(minimum_neighbour);
+}
+
+void fragment() {
+	// float worley = worley(UV, 6.0, 6.0);
+	
+	int biome_count = 4;
+	float big_columns = 0.2;
+	float big_rows = 0.2;
+	
+	float columns = 0.1;
+	float rows = 0.1;
+	vec2 uv = UV / 0.01;
+	vec2 offset = vec2(sin(TIME * 0.1), cos(TIME * 0.1));
+	
+	uv += offset;
+	vec2 index_uv = floor(vec2(uv.x * columns, uv.y * rows));
+	vec2 segment_big = voronoi_segment(uv + offset + vec2(1.0, 3.0), big_columns, big_rows);
+	
+	int biome_big = int(floor(rand1d(segment_big) * float(5)));
+	vec2 segment = voronoi_segment(uv + offset, columns, rows);
+
+	// segment = index_uv;
+	int biome_id = int(ceil(rand1d(segment) * float(biome_count)));
+	if (biome_big < 4) {
+		biome_id = 0;
+	}
+	
+	int cell_rows = 6;
+	int cell_cols = 6;
+	ivec2 cellId = voronoiCellId(uv + offset, vec2(0.125, 0.125));
+	vec4 water_land_value = rand1d(vec2(cellId)) < 0.66 ? GrassColor : DeepWaterColor;
+	
+	COLOR = water_land_value;
+	
+	// COLOR = vec4(float((cellId.x)) * 0.01, 0.0, 0.0, 1.0);
+	
+//	if (biome_id == 0) {
+//		COLOR = DeepWaterColor;
+//	} else if (biome_id == 1) {
+//		COLOR = GrassColor;
+//	} else if (biome_id == 2) {
+//		COLOR = SandColor;
+//	} else if (biome_id == 3) {
+//		COLOR = RockColor;
+//	} else if (biome_id == 4) {
+//		COLOR = SnowColor;
+//	} else {
+//		COLOR = vec4(float(biome_id) / float(biome_count), 0.0, 0.0, 1.0);
+//	}
+}

scenes/VoronoiBasedBiomes2D.tscn

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+[gd_scene load_steps=4 format=2]
+
+[ext_resource path="res://icon.png" type="Texture" id=1]
+[ext_resource path="res://materials/shader/VoronoiBasedBiomes2D.gdshader" type="Shader" id=2]
+
+[sub_resource type="ShaderMaterial" id=2]
+shader = ExtResource( 2 )
+shader_param/DeepWaterColor = Color( 0, 0, 0.6, 1 )
+shader_param/WaterColor = Color( 0, 0, 0.7, 1 )
+shader_param/LightWaterColor = Color( 0, 0, 1, 1 )
+shader_param/SandColor = Color( 0.8, 0.8, 0.1, 1 )
+shader_param/GrassColor = Color( 0, 0.6, 0, 1 )
+shader_param/ForestColor = Color( 0, 0.4, 0, 1 )
+shader_param/RockColor = Color( 0.5, 0.5, 0.4, 1 )
+shader_param/SnowColor = Color( 1, 1, 1, 1 )
+
+[node name="Node2D" type="Node2D"]
+
+[node name="Sprite" type="Sprite" parent="."]
+material = SubResource( 2 )
+position = Vector2( 195, 368 )
+scale = Vector2( 5.89062, 5.29688 )
+texture = ExtResource( 1 )