Optimise MapBlockMesh related functions

Directely or indirectly optimises the following functions:

* MapBlockMesh::MapBlockMesh
* MapBlockMesh::getTileInfo
* MapBlockMesh::makeFastFace
* MapBlockMesh::getSmoothLightCombined

1 files changed, 14 insertions, 1 deletions

diff --git a/src/voxel.h b/src/voxel.h
index 52274ac19..054644889 100644
--- a/src/voxel.h
+++ b/src/voxel.h
@@ -413,10 +413,21 @@ public:
 	}
 	// Stuff explodes if non-emerged area is touched with this.
 	// Emerge first, and check VOXELFLAG_NO_DATA if appropriate.
-	MapNode & getNodeRefUnsafe(v3s16 p)
+	MapNode & getNodeRefUnsafe(const v3s16 &p)
 	{
 		return m_data[m_area.index(p)];
 	}
+
+	const MapNode & getNodeRefUnsafeCheckFlags(const v3s16 &p)
+	{
+		s32 index = m_area.index(p);
+
+		if (m_flags[index] & VOXELFLAG_NO_DATA)
+			return ContentIgnoreNode;
+
+		return m_data[index];
+	}
+
 	u8 & getFlagsRefUnsafe(v3s16 p)
 	{
 		return m_flags[m_area.index(p)];
@@ -569,6 +580,8 @@ public:
 	*/
 	u8 *m_flags;
 
+	static const MapNode ContentIgnoreNode;
+
 	//TODO: Use these or remove them
 	//TODO: Would these make any speed improvement?
 	//bool m_pressure_route_valid;