Before 优化 机场

Assets/Plugins/Kamgam/UIToolkitBlurredBackground/Runtime/Scripts/Rendering/RenderUtils.cs

@@ -0,0 +1,64 @@
+using UnityEngine;
+using System.Collections.Generic;
+#if UNITY_EDITOR
+using UnityEditor;
+#endif
+namespace Kamgam.UIToolkitBlurredBackground
+{
+    public static class RenderUtils
+    {
+        static Camera _cachedGameViewCam;
+
+        static Camera[] _tmpAllCameras = new Camera[10];
+
+        public static Camera GetGameViewCamera()
+        {
+            var cam = Camera.main;
+            if (cam == null)
+            {
+                // Fetch cameras
+                int allCamerasCount = Camera.allCamerasCount;
+                // Alloc new array only if needed
+                if (allCamerasCount > _tmpAllCameras.Length)
+                {
+                    _tmpAllCameras = new Camera[allCamerasCount + 5];
+                }
+                Camera.GetAllCameras(_tmpAllCameras);
+
+                // We sort by depth and start from the back because we assume
+                // that among cameras with equal depth the last takes precedence.
+                float maxDepth = float.MinValue;
+                for (int i = _tmpAllCameras.Length - 1; i >= 0; i--)
+                {
+                    // Null out old references
+                    if (i >= allCamerasCount)
+                    {
+                        _tmpAllCameras[i] = null;
+                        continue;
+                    }
+
+                    var cCam = _tmpAllCameras[i];
+
+                    if (!cCam.isActiveAndEnabled)
+                        continue;
+
+                    // Only take full screen cameras that are not rendering into render textures
+                    if (cCam.depth > maxDepth && cCam.targetTexture == null && cCam.rect.width >= 1f && cCam.rect.height >= 1f)
+                    {
+                        maxDepth = cCam.depth;
+                        cam = cCam;
+                    }
+                }
+            }
+
+            // cache game view camera
+            if (cam != null && cam.cameraType == CameraType.Game)
+                _cachedGameViewCam = cam;
+
+            if (cam == null)
+                return _cachedGameViewCam;
+
+            return cam;
+        }
+    }
+}