Tour about texture memory release when change level

[fangguanya]

  Experience sharing, not question!

 :(I found that when I changed my scene at run-time, the atlases that used in previous scene were still referenced and were not releasing at all!! that's wasting memory for me!
So I went through this topic, and I found one related topic:
http://www.tasharen.com/forum/index.php?topic=1979.msg10010#msg10010
With solutions in this topic, I tried
1.panel.Refresh();
2.UIDrawCall.ReleaseAll();
and so on.
Finally I get it work at Editor with code below:

1. public void SwitchToScene()
2.     {
3.         Application.LoadLevel(1);
4.         NGUIText.bitmapFont = null;
5.         NGUIText.dynamicFont = null;
6.         foreach (UIPanel panel in GameObject.FindObjectsOfType<UIPanel>())
7.         {
8.             panel.Refresh();
9.         }
10.  
11.         StartCoroutine(ClearScene());
12.     }
13.  
14.     IEnumerator ClearScene()
15.     {
16.         yield return new WaitForEndOfFrame();
17.         Resources.UnloadUnusedAssets();
18.     }
19.  

And the memory of unused texture will be free in *Editor* mode!
But at run-time, the memory was not free at all!! so I keep going through, I found NGUITools.DestroyImmediate is different between editor and run-time vertion. In Editor, the object will destroy immediately, but at playing, the object will destroy at the end of the frame, so i add a 'WaitForEndOfFrame' coroutine at my code,
Yeah, it doesn't help, texture still there! I debugged that code through and found that Unity3D call my coroutine before UIDrawCall.OnDestroy!

1. static public void Destroy (UIDrawCall dc)
2.         {
3.                 if (dc)
4.                 {
5.                         if (Application.isPlaying)
6.                         {
7.                                 if (mActiveList.Remove(dc))
8.                                 {
9.                                         NGUITools.SetActive(dc.gameObject, false);
10.                                         mInactiveList.Add(dc);
11.                                 }
12.                         }
13.                         else
14.                         {
15.                                 mActiveList.Remove(dc);
16.                                 NGUITools.DestroyImmediate(dc.gameObject);
17.                         }
18.                 }
19.         }
20.  

Yes, you found it! UIDrawCall doesn't release at run-time! it was just disable! still weird about it ? hahah

1.  
2.     void OnDisable()
3.     {
4.         depthStart = int.MaxValue;
5.         depthEnd = int.MinValue;
6.         panel = null;
7.         manager = null;
8.         mMaterial = null;
9.         mTexture = null;
10.  
11.         NGUITools.DestroyImmediate(mDynamicMat);
12.         mDynamicMat = null;
13.        
14.         // !< WARN:codes that I add, the referenced material at mDynamicMat was released but not the real one!
15.         if (mRenderer != null)
16.         {
17.             mRenderer.sharedMaterials = new Material[] { };
18.         }
19.     }
20.  

All of above is all my experience to free the UIAtlas memory.
Excuse for my poor English, and thanks for reading, I hope this will help you!.

[fangguanya]

Experience sharing, not question!

 :(I found that when I changed my scene at run-time, the atlases that used in previous scene were still referenced and were not releasing at all!! that's wasting memory for me!
So I went through this topic, and I found one related topic:
http://www.tasharen.com/forum/index.php?topic=1979.msg10010#msg10010
With solutions in this topic, I tried
1.panel.Refresh();
2.UIDrawCall.ReleaseAll();
and so on.
Finally I get it work at Editor with code below:

1. public void SwitchToScene()
2.     {
3.         Application.LoadLevel(1);
4.         NGUIText.bitmapFont = null;
5.         NGUIText.dynamicFont = null;
6.         foreach (UIPanel panel in GameObject.FindObjectsOfType<UIPanel>())
7.         {
8.             panel.Refresh();
9.         }
10.  
11.         StartCoroutine(ClearScene());
12.     }
13.  
14.     IEnumerator ClearScene()
15.     {
16.         yield return new WaitForEndOfFrame();
17.         Resources.UnloadUnusedAssets();
18.     }
19.  

And the memory of unused texture will be free in *Editor* mode!
But at run-time, the memory was not free at all!! so I keep going through, I found NGUITools.DestroyImmediate is different between editor and run-time vertion. In Editor, the object will destroy immediately, but at playing, the object will destroy at the end of the frame, so i add a 'WaitForEndOfFrame' coroutine at my code,
Yeah, it doesn't help, texture still there! I debugged that code through and found that Unity3D call my coroutine before UIDrawCall.OnDestroy!

1. static public void Destroy (UIDrawCall dc)
2.         {
3.                 if (dc)
4.                 {
5.                         if (Application.isPlaying)
6.                         {
7.                                 if (mActiveList.Remove(dc))
8.                                 {
9.                                         NGUITools.SetActive(dc.gameObject, false);
10.                                         mInactiveList.Add(dc);
11.                                 }
12.                         }
13.                         else
14.                         {
15.                                 mActiveList.Remove(dc);
16.                                 NGUITools.DestroyImmediate(dc.gameObject);
17.                         }
18.                 }
19.         }
20.  

Yes, you found it! UIDrawCall doesn't release at run-time! it was just disable! still weird about it ? hahah

1.  
2.     void OnDisable()
3.     {
4.         depthStart = int.MaxValue;
5.         depthEnd = int.MinValue;
6.         panel = null;
7.         manager = null;
8.         mMaterial = null;
9.         mTexture = null;
10.  
11.         NGUITools.DestroyImmediate(mDynamicMat);
12.         mDynamicMat = null;
13.        
14.         // !< WARN:codes that I add, the referenced material at mDynamicMat was released but not the real one!
15.         if (mRenderer != null)
16.         {
17.             mRenderer.sharedMaterials = new Material[] { };
18.         }
19.     }
20.  

All of above is all my experience to free the UIAtlas memory.
Excuse for my poor English, and thanks for reading, I hope this will help you!.

Just forgot one important notice: I remove the UIPanel manual via code, not by default.

[ArenMook]

Thanks, I'll actually add your addition to NGUI itself and see if it causes any downsides.