Added resource weights and layer unlock UI to the game.

Scripts/World/ResourceDistributor.cs

@@ -4,30 +4,37 @@ using Godot;
 public class ResourceDistributor
 {
     public static Dictionary<string, Texture2D> resources = ResourceLoader.LoadResourceSymbols();
+    public static Dictionary<string, float[]> weights = ResourceLoader.LoadResourceWeights();
 
-    public static string GetResource(List<string> current)
+    public static string GetResource(int layer)
     {
-        List<string> availableResources = GetUnusedResources(current);
-        if (availableResources.Count <= 0)
-        {
-            availableResources = new List<string>(resources.Keys);
-        }
-
-        return availableResources[GameData.rand.Next(availableResources.Count)];
+        return ChooseWeighted(layer);
     }
 
-    private static List<string> GetUnusedResources(List<string> current)
-    {
-        List<string> result = new List<string>();
+    private static string ChooseWeighted(int layer)
+	{
+		float totalWeight = 0f;
+        float weightLerp;
 
-        foreach (string resource in resources.Keys)
-        {
-            if (!current.Contains(resource))
-            {
-                result.Add(resource);
-            }
-        }
+		foreach (string resource in resources.Keys)
+		{
+            weightLerp = Mathf.Lerp(weights[resource][0], weights[resource][1], layer);
+			totalWeight += weightLerp;
+		}
 
-        return result;
-    }
+		float r = (float)(GameData.rand.NextDouble() * totalWeight);
+
+		float cumulative = 0f;
+
+		foreach (string resource in resources.Keys)
+		{
+            weightLerp = Mathf.Lerp(weights[resource][0], weights[resource][1], layer);
+			cumulative += weightLerp;
+
+			if (r <= cumulative)
+				return resource;
+		}
+
+		return "stone";
+	}
 }