Simplify cull mask setting

COM3D2.ToukaScreenShot.Plugin/ToukaScreenShot.cs

@@ -16,11 +16,17 @@ namespace CM3D2.ToukaScreenShot.Plugin
     [PluginFilter("COM3D2x64")]
     public class ToukaScreenShot : PluginBase
     {
-        private readonly bool[] bLayerMask = new bool[32];
-
+        private readonly HashSet<int> defaultVisibleLayers = new HashSet<int>
+        {
+            0,
+            1,
+            10
+        };
+        
         private readonly FieldInfo fBloom =
             typeof(CameraMain).GetField("m_gcBloom", BindingFlags.Instance | BindingFlags.NonPublic);
 
+        private int layerMask = 0;
         private bool altKey;
         private bool bgActiveBack = true;
         private Color bgColorBack = Color.black;
@@ -36,20 +42,13 @@ namespace CM3D2.ToukaScreenShot.Plugin
         private int maskBack;
         private bool noConfigFlg;
         private bool shiftKey;
-        private IniFile sPreferences;
         private string triggerKey = "s";
 
         private void Start()
         {
-            sPreferences = Preferences;
-            var defaultVisibleLayers = new HashSet<int>
-            {
-                0,
-                1,
-                10
-            };
-            for (var i = 0; i < bLayerMask.Length; i++)
-                bLayerMask[i] = GetValueIni("Visible", $"Layer{i}", defaultVisibleLayers.Contains(i));
+            for (var i = 0; i < sizeof(int) * 8; i++)
+                if (GetValueIni("Visible", $"Layer{i}", defaultVisibleLayers.Contains(i)))
+                    layerMask |= 1 << i;
 
             folderName = GetValueIni("File", "Folder", "ScreenShot");
             fileNameHead = GetValueIni("File", "Head", "img");
@@ -80,7 +79,7 @@ namespace CM3D2.ToukaScreenShot.Plugin
                 }
             }
             
-            var iniKey = sPreferences[section][key];
+            var iniKey = Preferences[section][key];
             if (iniKey != null && !string.IsNullOrEmpty(iniKey.Value) &&
                 TryParse(iniKey.Value, out var result)) return result;
             iniKey.Value = Convert.ToString(@default, CultureInfo.InvariantCulture);
@@ -205,12 +204,7 @@ namespace CM3D2.ToukaScreenShot.Plugin
 
         private void SetCameraMask()
         {
-            var num = 0;
-            for (var i = 0; i < bLayerMask.Length; i++)
-                if (bLayerMask[i])
-                    num += 1 << i;
-            
-            mainCamera.cullingMask = num;
+            mainCamera.cullingMask = layerMask;
             if (!bgVisible) GameMain.Instance.BgMgr.current_bg_object.SetActive(false);
             if (!bloomOff) return;
             var bloom = (Bloom) fBloom.GetValue(GameMain.Instance.MainCamera);