feat(memory): 搜索 overlay 遮罩与调频目标采样优化

Co-authored-by: Cursor <cursoragent@cursor.com>

Assets/Scripts/FixSystem/Memory/MemoryProcess.cs

@@ -59,6 +59,12 @@ namespace AibisDream.FixSystem
         [SerializeField] private bool useSpriteShaderTuning = true;
 
         [SerializeField] private CanvasGroup playBackground;
+        [SerializeField] private Graphic standbyOverlay;
+        [SerializeField, Range(0f, 1f)] private float standbyOverlayMinAlpha = 0.04f;
+        [SerializeField, Range(0f, 1f)] private float standbyOverlayMaxAlpha = 0.12f;
+        [SerializeField, Range(0f, 1f)] private float searchOverlayAlpha = 0.85f;
+        [SerializeField] private float standbyOverlayPulseDuration = 0.8f;
+        [SerializeField] private float searchTargetMinDistanceFromStart = 2.5f;
 
         [SerializeField] private GameObject memoryGroup;
 
@@ -72,6 +78,7 @@ namespace AibisDream.FixSystem
         [SerializeField] private Material fadeMaterial;
         private Material runtimeMemoryMaterial;
         private Material runtimeNoColorMemoryMaterial;
+        private Tween overlayTween;
 
         public void OpenMemoryView()
         {
@@ -94,6 +101,8 @@ namespace AibisDream.FixSystem
 
         public void CloseMemoryView()
         {
+            StopStandbyOverlay();
+            SetOverlayAlpha(0f);
             memoryView.gameObject.SetActive(false);
             memoryGroup.SetActive(false);
         }
@@ -116,6 +125,7 @@ namespace AibisDream.FixSystem
             PunchTapeManager.Instance.OpenFavoritesPanel();
             playBackground.gameObject.SetActive(false);
             playBackground.alpha = 0;
+            StartStandbyOverlay();
         }
 
         public void OnExit()
@@ -180,6 +190,7 @@ namespace AibisDream.FixSystem
 
         private void OnDestroy()
         {
+            overlayTween?.Kill();
             if (runtimeMemoryMaterial != null)
                 Destroy(runtimeMemoryMaterial);
             if (runtimeNoColorMemoryMaterial != null)
@@ -205,17 +216,23 @@ namespace AibisDream.FixSystem
                 OnSearchComplete();
         }
 
-        private float GetRandomNumber()
+        private float GetRandomSearchTarget(MemorySlider slider)
         {
-            // 随机决定选择哪个区间
-            if (UnityEngine.Random.value < 0.5f) // 50% 概率选择第一个区间
-            {
-                return UnityEngine.Random.Range(0.5f, 2f);
-            }
-            else // 50% 概率选择第二个区间
-            {
-                return UnityEngine.Random.Range(4f, 5.5f);
-            }
+            float start = slider != null ? slider.StartValue : 0f;
+            float max = slider != null ? slider.MaxValue : 6f;
+            float minDistance = Mathf.Max(0f, searchTargetMinDistanceFromStart);
+            float nearBandMin = start + minDistance;
+            float nearBandMax = start + (max - start) * 0.55f;
+            float farBandMin = max - 1.5f;
+            float farBandMax = max - 0.5f;
+
+            if (nearBandMin >= nearBandMax)
+                return UnityEngine.Random.Range(farBandMin, farBandMax);
+
+            if (UnityEngine.Random.value < 0.5f)
+                return UnityEngine.Random.Range(nearBandMin, nearBandMax);
+
+            return UnityEngine.Random.Range(farBandMin, farBandMax);
         }
 
         private void OnSearchComplete()
@@ -303,6 +320,7 @@ namespace AibisDream.FixSystem
             SetMemoryColor(Color.black);
             SetVolumeWeight(memoryProcessVolume, 0f);
             _activePunchTape = null;
+            StartStandbyOverlay();
 
             playBackground.gameObject.SetActive(false);
             playBackground.alpha = 0;
@@ -390,13 +408,14 @@ namespace AibisDream.FixSystem
                 isPlayingFaderSound = false;
             }
 
-            frequencySlider.TargetValue = GetRandomNumber();
-            claritySlider.TargetValue = GetRandomNumber();
+            frequencySlider.TargetValue = GetRandomSearchTarget(frequencySlider);
+            claritySlider.TargetValue = GetRandomSearchTarget(claritySlider);
             PunchTapeManager.Instance.CloseFavoritesPanel();
 
             if (punchTape == null)
             {
                 Debug.Log("no punchTape");
+                StartStandbyOverlay();
                 yield break;
             }
 
@@ -408,6 +427,9 @@ namespace AibisDream.FixSystem
                 yield break;
             }
 
+            StopStandbyOverlay();
+            ShowSearchOverlay();
+
             var searchMemoryKey = string.Format(MemorySpritePath, _activePunchTape.MemoryIndex);
             var searchMemoryHandle = ResourceSystem.LoadAsync<Sprite>(searchMemoryKey);
             yield return searchMemoryHandle;
@@ -420,17 +442,16 @@ namespace AibisDream.FixSystem
                 Debug.LogError("Memory not found: " + searchMemoryKey);
             }
 
-            SetVolumeWeight(memoryProcessVolume, 1f);
             AudioManager.Instance.PlaySfx("event:/Scriptal/mem_load");
 
             yield return new WaitForSeconds(SearchStartDelay);
             AudioManager.Instance.SetSfxParam("event:/Amb/amb_mem_tuning", "is_mem_tuning", 1);
 
             SetMemoryColor(Color.white);
-            SetVolumeWeight(memoryProcessVolume, 0f);
             isProcessing = true;
             frequencySlider.PrepareForSearch();
             claritySlider.PrepareForSearch();
+            ClearSearchOverlay();
             bool freqUnlocked = false;
             bool clarityUnlocked = false;
             frequencySlider.UnlockSlider(() => freqUnlocked = true);
@@ -562,6 +583,47 @@ namespace AibisDream.FixSystem
             return memoryFinishedImage != null || legacyMemoryFinishedSpriteRenderer != null;
         }
 
+        private void StartStandbyOverlay()
+        {
+            if (standbyOverlay == null || isProcessing)
+                return;
+
+            overlayTween?.Kill();
+            SetOverlayAlpha(standbyOverlayMinAlpha);
+            overlayTween = standbyOverlay
+                .DOFade(standbyOverlayMaxAlpha, Mathf.Max(0.01f, standbyOverlayPulseDuration))
+                .SetLoops(-1, LoopType.Yoyo)
+                .SetEase(Ease.InOutSine);
+        }
+
+        private void StopStandbyOverlay()
+        {
+            overlayTween?.Kill();
+            overlayTween = null;
+        }
+
+        private void ShowSearchOverlay()
+        {
+            StopStandbyOverlay();
+            SetOverlayAlpha(searchOverlayAlpha);
+        }
+
+        private void ClearSearchOverlay()
+        {
+            StopStandbyOverlay();
+            SetOverlayAlpha(0f);
+        }
+
+        private void SetOverlayAlpha(float alpha)
+        {
+            if (standbyOverlay == null)
+                return;
+
+            Color color = standbyOverlay.color;
+            color.a = Mathf.Clamp01(alpha);
+            standbyOverlay.color = color;
+        }
+
         private void SetMemorySprite(Sprite sprite)
         {
             if (memoryFinishedImage != null)