added hotreload

Packages/com.singularitygroup.hotreload/Editor/Helpers/Spinner.cs

@@ -0,0 +1,80 @@
+using System;
+using UnityEngine;
+
+namespace SingularityGroup.HotReload.Editor {
+    internal class Spinner {
+        internal static string SpinnerIconPath => "icon_loading_star_light_mode_96";
+        internal static Texture2D spinnerTexture => GUIHelper.GetInvertibleIcon(InvertibleIcon.Spinner);
+        private Texture2D _rotatedTextureLight;
+        private Texture2D _rotatedTextureDark;
+        private Texture2D rotatedTextureLight => _rotatedTextureLight ? _rotatedTextureLight : _rotatedTextureLight = GetCopy(spinnerTexture);
+        private Texture2D rotatedTextureDark => _rotatedTextureDark ? _rotatedTextureDark : _rotatedTextureDark = GetCopy(spinnerTexture);
+        internal Texture2D rotatedTexture => HotReloadWindowStyles.IsDarkMode ? rotatedTextureDark : rotatedTextureLight;
+        
+        private float _rotationAngle;
+        private DateTime _lastRotation;
+        private int _rotationPeriod;
+        
+        internal Spinner(int rotationPeriodInMilliseconds) {
+            _rotationPeriod = rotationPeriodInMilliseconds;
+        }
+        
+        internal Texture2D GetIcon() {
+            if (DateTime.UtcNow - _lastRotation > TimeSpan.FromMilliseconds(_rotationPeriod)) {
+                _lastRotation = DateTime.UtcNow;
+                _rotationAngle += 45;
+                if (_rotationAngle >= 360f) 
+                    _rotationAngle -= 360f;
+                return RotateImage(spinnerTexture, _rotationAngle);
+            }
+            return rotatedTexture;
+        }
+        
+        private Texture2D RotateImage(Texture2D originalTexture, float angle) {
+            int w = originalTexture.width;
+            int h = originalTexture.height;
+            
+            int x, y;
+            float centerX = w / 2f;
+            float centerY = h / 2f;
+
+            for (x = 0; x < w; x++) {
+                for (y = 0; y < h; y++) {
+                    float dx = x - centerX;
+                    float dy = y - centerY;
+                    float distance = Mathf.Sqrt(dx * dx + dy * dy);
+                    float oldAngle = Mathf.Atan2(dy, dx) * Mathf.Rad2Deg;
+                    float newAngle = oldAngle + angle;
+
+                    float newX = centerX + distance * Mathf.Cos(newAngle * Mathf.Deg2Rad);
+                    float newY = centerY + distance * Mathf.Sin(newAngle * Mathf.Deg2Rad);
+
+                    if (newX >= 0 && newX < w && newY >= 0 && newY < h) {
+                        rotatedTexture.SetPixel(x, y, originalTexture.GetPixel((int)newX, (int)newY));
+                    } else {
+                        rotatedTexture.SetPixel(x, y, Color.clear);
+                    }
+                }
+            }
+
+            rotatedTexture.Apply();
+            return rotatedTexture;
+        }
+
+        public static Texture2D GetCopy(Texture2D tex, TextureFormat format = TextureFormat.RGBA32, bool mipChain = false) {
+            var tmp = RenderTexture.GetTemporary(tex.width, tex.height, 0, RenderTextureFormat.Default, RenderTextureReadWrite.Linear);
+            Graphics.Blit(tex, tmp);
+
+            RenderTexture.active = tmp;
+            try {
+                var copy = new Texture2D(tex.width, tex.height, format, mipChain: mipChain);
+                copy.ReadPixels(new Rect(0, 0, tmp.width, tmp.height), 0, 0);
+                copy.Apply();
+                return copy;
+            } finally {
+                RenderTexture.active = null;
+                RenderTexture.ReleaseTemporary(tmp);
+            }
+        }
+    }
+}