D3D11: Fix memory allocation in markLevelDirty.

This would drastically slow down some framebuffer updates. BUG=angleproject:1155 Change-Id: Ibff428c49bd5127a101bce46cc1df355f4542ccf Reviewed-on: https://chromium-review.googlesource.com/649986 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

D3D11: Fix memory allocation in markLevelDirty.
ad6e2b6a · Jamie Madill · Commit Bot · 7d1f5c60 · ad6e2b6a
Commit ad6e2b6a authored Sep 03, 2017 by Jamie Madill Committed by Commit Bot Sep 05, 2017
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TextureStorage11.cpp src/libANGLE/renderer/d3d/d3d11/TextureStorage11.cpp +4 -1

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--- a/src/libANGLE/renderer/d3d/d3d11/TextureStorage11.cpp
+++ b/src/libANGLE/renderer/d3d/d3d11/TextureStorage11.cpp
@@ -381,7 +381,10 @@ void TextureStorage11::markLevelDirty(int mipLevel)
        mSwizzleCache[mipLevel] = gl::SwizzleState();
    }
-    mDropStencilTexture.reset();
+    if (mDropStencilTexture.valid())
+    {
+        mDropStencilTexture.reset();
+    }
 }
 void TextureStorage11::markDirty()