fix: PencilLineRenderCapturer did not capture line results correctly (#419)

Others:
* fix warning: Releasing render texture that is set to be RenderTexture.active!

Author: sindharta

Runtime/Scripts/Features/RenderCache/Components/BaseRenderCapturer.cs

@@ -73,6 +73,10 @@ public void CaptureToFile(string outputFilePath, RenderCacheOutputFormat outputF
     protected void ReleaseRenderTexture() {
         if (null == m_rt)
             return;
+
+        if (RenderTexture.active == m_rt)
+            RenderTexture.active = null;
+        
         m_rt.Release();
         m_rt = null;        
     }

Runtime/Scripts/Features/RenderCache/Components/PencilLineRenderCapturer.cs

@@ -55,9 +55,9 @@ public override IEnumerator BeginCaptureV() {
         Assert.IsNotNull(lineRenderer);
 
         ReleaseRenderTexture();
-        m_pencilTex = lineRenderer.Texture;
+        Texture2D pencilTex = lineRenderer.Texture;
 
-        m_rt = new RenderTexture(m_pencilTex.width, m_pencilTex.height, 0);
+        m_rt = new RenderTexture(pencilTex.width, pencilTex.height, 0);
         m_rt.Create();
 
 #else
@@ -80,7 +80,9 @@ public override void EndCaptureV() {
     /// <inheritdoc/>
     protected override RenderTexture UpdateRenderTextureV() {
 #if AT_USE_PENCILLINE
-        Graphics.Blit(m_pencilTex, m_rt);
+        PencilLineRenderer lineRenderer = m_pencilLineEffect.PencilRenderer;
+        Assert.IsNotNull(lineRenderer);
+        Graphics.Blit(lineRenderer.Texture, m_rt);
 #endif
         return m_rt;
     }
@@ -107,7 +109,6 @@ public override Material GetOrCreateBlitToScreenEditorMaterialV() {
 
 #if AT_USE_PENCILLINE
     [SerializeField] private PencilLineEffect m_pencilLineEffect        = null;
-    private                  Texture2D        m_pencilTex               = null;
     private                  bool             m_prevPencilLineEffectEnabled = false;
 #endif