Add updateBoundingBox parameter to IMeshBuffer::append and some fixes and optimizations

Fix: When appending to an empty mesh boundingbox has to be initialized with first position
Adding updateBoundingBox parameter as there is a bit costs involved in updating that and it might not be necessary at that point
Default is still to do it - and with the default parameter it's at least compile compatible to old interface (unless users created their own meshbuffers).
Optimizing the copying of vertices in CDynamicMeshBuffer::append by using memset when possible instead of pushing each vertex (which goes through quite a few virtual functions)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6496 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

@@ -1,6 +1,7 @@
 --------------------------
 Changes in 1.9 (not yet released)
 
+- Get IMeshBuffer::append functions working for a few more cases and adapt interface so one can prevent the BoundingBox update.
 - Bugfix: SMaterialLayer::operator!= no longer returns true when comparing a layer without texture matrix with one with a set identity texture matrix. Those are the same.
 - SMaterialLayer no longer releases allocated texture memory before destructor unless explicitly requested.
   This can avoid constantly allocation/releasing memory in the active driver material when setting materials.

include/CDynamicMeshBuffer.h

@@ -108,20 +108,20 @@ namespace scene
 		\param numVertices Number of vertices in the array.
 		\param indices Pointer to index array.
 		\param numIndices Number of indices in array. */
-		virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices) IRR_OVERRIDE
+		virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices, bool updateBoundingBox=true) IRR_OVERRIDE
 		{
 			// We simply assume it has the same vertex and index type as this object. If other types are passed this will crash
-			append(getVertexType(), vertices, numVertices, getIndexType(), indices, numIndices);
+			append(getVertexType(), vertices, numVertices, getIndexType(), indices, numIndices, updateBoundingBox);
 		}
 
 		//! Append the meshbuffer to the current buffer
 		/** \param other Buffer to append to this one. */
-		virtual void append(const IMeshBuffer* const other) IRR_OVERRIDE
+		virtual void append(const IMeshBuffer* const other, bool updateBoundingBox=true) IRR_OVERRIDE
 		{
-			append(other->getVertexType(), other->getVertices(), other->getVertexCount(), other->getIndexType(), other->getIndices(), other->getIndexCount());
+			append(other->getVertexType(), other->getVertices(), other->getVertexCount(), other->getIndexType(), other->getIndices(), other->getIndexCount(), updateBoundingBox);
 		}
 
-		void append(video::E_VERTEX_TYPE vertexType, const void* const vertices, u32 numVertices, video::E_INDEX_TYPE indexType, const void* const indices, u32 numIndices)
+		void append(video::E_VERTEX_TYPE vertexType, const void* const vertices, u32 numVertices, video::E_INDEX_TYPE indexType, const void* const indices, u32 numIndices, bool updateBoundingBox)
 		{
 			if (vertices == getVertices() || indices == getIndices())	// can't do that because we're doing reallocations on those blocks
 				return;
@@ -129,29 +129,49 @@ namespace scene
 			const u32 vertexCount = getVertexCount();
 
 			VertexBuffer->reallocate(vertexCount+numVertices, false);
-			switch ( vertexType )
+			if ( vertexType == getVertexType() )
 			{
-				case video::EVT_STANDARD:
-					for (u32 i=0; i<numVertices; ++i)
-					{
-						VertexBuffer->push_back(static_cast<const video::S3DVertex*>(vertices)[i]);
-						BoundingBox.addInternalPoint(static_cast<const video::S3DVertex*>(vertices)[i].Pos);
-					}
-					break;
-				case video::EVT_2TCOORDS:
-					for (u32 i=0; i<numVertices; ++i)
-					{
-						VertexBuffer->push_back(static_cast<const video::S3DVertex2TCoords*>(vertices)[i]);
-						BoundingBox.addInternalPoint(static_cast<const video::S3DVertex2TCoords*>(vertices)[i].Pos);
-					}
-					break;
-				case video::EVT_TANGENTS:
-					for (u32 i=0; i<numVertices; ++i)
-					{
-						VertexBuffer->push_back(static_cast<const video::S3DVertexTangents*>(vertices)[i]);
-						BoundingBox.addInternalPoint(static_cast<const video::S3DVertexTangents*>(vertices)[i].Pos);
-					}
-					break;
+				const irr::u32 typeSize = getVertexPitchFromType(vertexType);
+				VertexBuffer->set_used(vertexCount+numVertices);
+				irr::u8* target = &static_cast<irr::u8*>(VertexBuffer->pointer())[vertexCount*typeSize];
+				memcpy(target, vertices, numVertices*typeSize);
+			}
+			else
+			{
+				switch ( vertexType )
+				{
+					case video::EVT_STANDARD:
+						for (u32 i=0; i<numVertices; ++i)
+						{
+							VertexBuffer->push_back(static_cast<const video::S3DVertex*>(vertices)[i]);
+						}
+						break;
+					case video::EVT_2TCOORDS:
+						for (u32 i=0; i<numVertices; ++i)
+						{
+							VertexBuffer->push_back(static_cast<const video::S3DVertex2TCoords*>(vertices)[i]);
+						}
+						break;
+					case video::EVT_TANGENTS:
+						for (u32 i=0; i<numVertices; ++i)
+						{
+							VertexBuffer->push_back(static_cast<const video::S3DVertexTangents*>(vertices)[i]);
+						}
+						break;
+				}
+			}
+
+			if ( updateBoundingBox && numVertices > 0)
+			{
+				if ( vertexCount == 0 )
+					BoundingBox.reset( static_cast<const video::S3DVertex*>(vertices)[0].Pos );
+
+				const u32 typePitch = getVertexPitchFromType(vertexType);
+				const irr::u8* v8 = static_cast<const irr::u8*>(vertices);
+				for (u32 i=0; i<numVertices; ++i, v8 += typePitch)
+				{
+					BoundingBox.addInternalPoint(reinterpret_cast<const video::S3DVertex*>(v8)->Pos);
+				}
 			}
 
 			IndexBuffer->reallocate(getIndexCount()+numIndices, false);

include/CMeshBuffer.h

@@ -193,7 +193,7 @@ namespace scene
 		or the main buffer is of standard type. Otherwise, behavior is
 		undefined. Also can't append it's own vertices/indices to itself.
 		*/
-		virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices) IRR_OVERRIDE
+		virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices, bool updateBoundingBox=true) IRR_OVERRIDE
 		{
 			if (vertices == getVertices() || indices == getIndices())	// can't do that because we're doing reallocations on those blocks
 				return;
@@ -205,7 +205,15 @@ namespace scene
 			for (i=0; i<numVertices; ++i)
 			{
 				Vertices.push_back(static_cast<const T*>(vertices)[i]);
-				BoundingBox.addInternalPoint(static_cast<const T*>(vertices)[i].Pos);
+			}
+
+			if ( updateBoundingBox && numVertices > 0)
+			{
+				if ( vertexCount == 0 )
+					BoundingBox.reset(static_cast<const T*>(vertices)[0].Pos);
+
+				for (i=0; i<numVertices; ++i)
+					BoundingBox.addInternalPoint(static_cast<const T*>(vertices)[i].Pos);
 			}
 
 			Indices.reallocate(getIndexCount()+numIndices, false);
@@ -219,12 +227,12 @@ namespace scene
 
 
 		//! Append the meshbuffer to the current buffer
-		virtual void append(const IMeshBuffer* const other) IRR_OVERRIDE
+		virtual void append(const IMeshBuffer* const other, bool updateBoundingBox=true) IRR_OVERRIDE
 		{
 			if ( getVertexType() != other->getVertexType() )
 				return;
 
-			append(other->getVertices(), other->getVertexCount(), other->getIndices(), other->getIndexCount());
+			append(other->getVertices(), other->getVertexCount(), other->getIndices(), other->getIndexCount(), updateBoundingBox);
 		}
 
 

include/IMeshBuffer.h

@@ -131,14 +131,16 @@ namespace scene
 		\param vertices Pointer to a vertex array.
 		\param numVertices Number of vertices in the array.
 		\param indices Pointer to index array.
-		\param numIndices Number of indices in array. */
-		virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices) = 0;
+		\param numIndices Number of indices in array. 
+		\param updateBoundingBox When true update boundingbox by the added vertices */
+		virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices, bool updateBoundingBox=true) = 0;
 
 		//! Not supported right now by all meshbuffer
 		//! In theory: Append the meshbuffer to the current buffer
 		/** Only works for compatible vertex and index types
-		\param other Buffer to append to this one. */
-		virtual void append(const IMeshBuffer* const other) = 0;
+		\param other Buffer to append to this one. 
+s		\param updateBoundingBox When true update boundingbox by the added vertices */
+		virtual void append(const IMeshBuffer* const other, bool updateBoundingBox=true) = 0;
 
 		//! get the current hardware mapping hint
 		virtual E_HARDWARE_MAPPING getHardwareMappingHint_Vertex() const = 0;

include/SSharedMeshBuffer.h

@@ -187,13 +187,13 @@ namespace scene
 
 
 		//! append the vertices and indices to the current buffer
-		virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices)  IRR_OVERRIDE 
+		virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices, bool updateBoundingBox)  IRR_OVERRIDE 
 		{
 			// can't do that as it doesn't own the vertex memory
 		}
 
 		//! append the meshbuffer to the current buffer
-		virtual void append(const IMeshBuffer* const other) IRR_OVERRIDE 
+		virtual void append(const IMeshBuffer* const other, bool updateBoundingBox) IRR_OVERRIDE 
 		{
 			// can't do that as it doesn't own the vertex memory
 		}

include/SSkinMeshBuffer.h

@@ -355,10 +355,10 @@ struct SSkinMeshBuffer : public IMeshBuffer
 	}
 
 	//! append the vertices and indices to the current buffer
-	virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices) IRR_OVERRIDE {}
+	virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices, bool updateBoundingBox) IRR_OVERRIDE {}
 
 	//! append the meshbuffer to the current buffer
-	virtual void append(const IMeshBuffer* const other) IRR_OVERRIDE {}
+	virtual void append(const IMeshBuffer* const other, bool updateBoundingBox) IRR_OVERRIDE {}
 
 	//! get the current hardware mapping hint for vertex buffers
 	virtual E_HARDWARE_MAPPING getHardwareMappingHint_Vertex() const IRR_OVERRIDE