genesis-3d_engine/Engine/app/terrainfeature/components/TerrainNodeTree.cc

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU

http://www.genesis-3d.com.cn

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****************************************************************************/

#include "stdneb.h"
#include "terrainfeature/components/TerrainNodeTree.h"

namespace App
{
	__ImplementClass(TerrainNodeTree, 'TNTR', Core::RefCounted);
	//------------------------------------------------------------------------
	TerrainNodeTree::TerrainNodeTree()
	{

	}
	//------------------------------------------------------------------------
	TerrainNodeTree::~TerrainNodeTree()
	{
		Reset();
	}
	//------------------------------------------------------------------------
	void TerrainNodeTree::Reset()
	{
		SizeT mipCount = m_TerrainTree.GetMipCount();

		for ( IndexT mip = 0; mip < mipCount; ++ mip )
		{
			SizeT rowSize = m_TerrainTree.RowSize(mip);
			SizeT colSize = m_TerrainTree.ColSize(mip);
			for ( IndexT col = 0; col < colSize; ++col )
			{
				for ( IndexT row = 0; row < rowSize;++row )
				{
					TerrainNode* node = m_TerrainTree.At(row,col,mip);
					n_delete(node);
					m_TerrainTree.At(row,col,mip) = NULL;
				}
			}
		}

		m_TerrainTree.Clear();
	}
	//------------------------------------------------------------------------
	void TerrainNodeTree::RebuildAllNodes(const GPtr<Terrain::TerrainDataSource>& terrainDataSource)
	{
		Reset();

		SizeT lodCount = terrainDataSource->GetLevelCount();// + 1;
		m_TerrainTree.Resize(lodCount,NULL);

		for (int level=0; level < lodCount; ++level)
		{
			SizeT rowSize = m_TerrainTree.RowSize(level);
			SizeT colSize = m_TerrainTree.ColSize(level);

			for ( IndexT y = 0; y < colSize; ++y )
			{
				for ( IndexT x = 0; x < rowSize;++x )
				{
					TerrainNode* node = n_new(TerrainNode);

					node->x = x;
					node->y = y;
					node->level = level;
					node->SetGeometryError( terrainDataSource->GetGeometryError(x, y, level) );
					bool bHole = terrainDataSource->GetSectorHoleType(x, y, level) == Terrain::eNotHole ? false: true;
					node->SetHole(bHole);
					Math::bbox bb = terrainDataSource->GetSectorWorldBBox(x, y, level);
					node->SetLocalBoundingBox(bb);

					m_TerrainTree.At(x,y,level) = node;
				}
			}
		}

		// Build node's neighbor and parent-child relationship
		for (int level=0; level < lodCount; ++level)
		{
			SizeT rowSize = m_TerrainTree.RowSize(level);
			SizeT colSize = m_TerrainTree.ColSize(level);

			for ( IndexT y = 0; y < colSize; ++y )
			{
				for ( IndexT x = 0; x < rowSize;++x )
				{
					TerrainNode* node = m_TerrainTree.At(x,y,level);
					n_assert(node);

					// parent
					TerrainNode* parent = GetNode(node->x / 2, node->y / 2, node->level + 1);
					node->SetParentNode(parent);

					// child
					TerrainNode* child_LeftUp = GetNode(node->x * 2, node->y * 2, node->level - 1);
					TerrainNode* child_RightUp = GetNode(node->x * 2 + 1, node->y * 2, node->level - 1);
					TerrainNode* child_LeftDown = GetNode(node->x * 2, node->y * 2 + 1, node->level - 1);
					TerrainNode* child_RightDown = GetNode(node->x * 2 + 1, node->y * 2 + 1, node->level - 1);
					node->SetChildNode(child_LeftUp, eLeftUpChild);
					node->SetChildNode(child_RightUp, eRightUpChild);
					node->SetChildNode(child_LeftDown, eLeftDownChild);
					node->SetChildNode(child_RightDown, eRightDownChild);

					// Neighbor
					TerrainNode* neighbor_Up = GetNode(node->x, node->y + 1, node->level);
					TerrainNode* neighbor_Down = GetNode(node->x, node->y - 1, node->level);
					TerrainNode* neighbor_Left =  GetNode(node->x - 1, node->y, node->level);
					TerrainNode* neighbor_Right = GetNode(node->x + 1, node->y, node->level);
					node->SetNeighborNode(neighbor_Up, eUpNeighbor );
					node->SetNeighborNode(neighbor_Down, eDownNeighbor );
					node->SetNeighborNode(neighbor_Left, eLeftNeighbor );
					node->SetNeighborNode(neighbor_Right, eRightNeighbor );
				}
			}
		}

	}
	//------------------------------------------------------------------------
	TerrainNode* TerrainNodeTree::GetRootNode()
	{
		if ( m_TerrainTree.GetMipCount() > 0 )
		{
			// miparray's highest order save 1*1 root
			return m_TerrainTree.At(0, 0,  m_TerrainTree.GetMipCount() - 1 );
		}
		else
		{
			return NULL;
		}
	}
	//------------------------------------------------------------------------
	TerrainNode* 
		TerrainNodeTree::GetNode(IndexT row, IndexT col, IndexT level)
	{
		if ( level >= 0 && level < m_TerrainTree.GetMipCount() )
		{
			SizeT rowSize = m_TerrainTree.RowSize(level);
			SizeT colSize = m_TerrainTree.ColSize(level);
			if ( row >= 0 && row < rowSize 
				&& col >= 0 && col < colSize )
			{
				return m_TerrainTree.At(row,col,level); 
			}
		}
		return NULL;
	}
}