genesis-3d_engine/Engine/foundation/util/mipmaparray.h

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#ifndef __miparray_H__
#define __miparray_H__
#include "util/fixedarray2d.h"
#include "util/array.h"

namespace Util
{
	/** 用于线性的存储四分金字塔数据。mip=0时，精度最高。 mip范围是[0,mipCount)
		暂只支持行列相等的金字塔
	**/
	template<typename TYPE>
	class MipmapArray
	{
	public:
		MipmapArray();

		void Resize(SizeT mipCount, const TYPE& elem);

		void Resize(SizeT mipCount);

		void Clear();

		/// all elems count in all levels
		SizeT GetAllElemsCount() const;

		/// get mipmap count
		SizeT GetMipCount() const;

		/// row size in level
		SizeT RowSize(IndexT level) const;

		/// column size in level
		SizeT ColSize(IndexT level) const;

		const TYPE& At(IndexT row, IndexT col, IndexT level) const;

		TYPE& At(IndexT row, IndexT col, IndexT level);

		/// (row,col,level) to 1D Index
		IndexT Index(IndexT row, IndexT col, IndexT level) const;

	protected:
		typedef Util::FixedArray2D<TYPE> _interContaner;
		typedef Util::Array<_interContaner> Container;
		
		/// 先存储n*n，(n-1)*(n-1), 1*1, 从精度最高向最低存储
		Container _array;
	};
	//------------------------------------------------------------------------
	template<typename TYPE>
	MipmapArray<TYPE>::MipmapArray()
	{

	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	void 
	MipmapArray<TYPE>::Resize(SizeT mipCount, const TYPE& elem)
	{
#if NEBULA3_BOUNDSCHECKS
		n_assert(mipCount>=0);
#endif

		Clear();

		if ( mipCount > 0 )
		{
			_array.Resize( mipCount, _interContaner());
			for ( IndexT i = 0; i < mipCount; ++i)
			{
				SizeT rowSizeInLevel = 1 << (mipCount-1-i);
				_array[i].Resize(rowSizeInLevel, rowSizeInLevel,elem);
			}
		}
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	void 
	MipmapArray<TYPE>::Resize(SizeT mipCount)
	{
#if NEBULA3_BOUNDSCHECKS
		n_assert(mipCount>=0);
#endif

		Clear();

		if ( mipCount > 0 )
		{
			_array.Resize( mipCount );
			for ( IndexT i = 0; i < mipCount; ++i)
			{
				SizeT rowSizeInLevel = 1 << (mipCount-1-i);
				_array[i].Resize(rowSizeInLevel, rowSizeInLevel);
			}
		}
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	SizeT 
	MipmapArray<TYPE>::GetAllElemsCount() const
	{
		//@TODO If Has Quick Method? 
		SizeT size = 0;
		for ( IndexT i =0; i < _array.Size(); ++i)
		{
			size += ( _array[i].Size() );
		}
		return size;
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	SizeT 
	MipmapArray<TYPE>::GetMipCount() const
	{
		return _array.Size();
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	void 
	MipmapArray<TYPE>::Clear()
	{
		_array.Clear();
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	SizeT MipmapArray<TYPE>::RowSize(IndexT level) const
	{
		return _array[level].RowSize();
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	SizeT MipmapArray<TYPE>::ColSize(IndexT level) const
	{
		return _array[level].ColSize();
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	const TYPE& 
	MipmapArray<TYPE>::At(IndexT row, IndexT col, IndexT level) const
	{
		const _interContaner& inner = _array[level];
		return inner.At(row,col);
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	TYPE& 
	MipmapArray<TYPE>::At(IndexT row, IndexT col, IndexT level)
	{
		_interContaner& inner = _array[level];
		return inner.At(row,col);
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	IndexT 
	MipmapArray<TYPE>::Index(IndexT row, IndexT col, IndexT level) const
	{
		IndexT index = 0;
		for ( IndexT mip = 0; mip < level ; ++mip )
		{
			index += ( _array[mip].Size() );
		}

		index += _array[level].Index(row, col);

		return index;
	}
	//------------------------------------------------------------------------

}








#endif // __miparray_H__