genesis-3d_engine/Engine/foundation/meshbuilder/conebuilder.h

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Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
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#ifndef __CONE_BUILDER_H__
#define __CONE_BUILDER_H__

#include "meshbuilder/meshbuilder.h"
#include "math/float3.h"

namespace MeshBuilder
{

#define CONE_VERTEX_COUNT(tessellation) tessellation + 2
#define CONE_INDEX_COUNT(tessellation) tessellation * 6//tessellation * 2 * 3;
	// <20><>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>Բ<EFBFBD>ģ<EFBFBD><C4A3>ڶ<EFBFBD><DAB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ׶<CEAA><D7B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ<EFBFBD><C4B6><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ե<EFBFBD><D4B5><EFBFBD>㣨<EFBFBD><E3A3A8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD><C4B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD>㣬<EFBFBD><E3A3AC><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>x<EFBFBD><78><EFBFBD>ϣ<EFBFBD><CFA3><EFBFBD><EFBFBD><EFBFBD>˳ʱ<CBB3><CAB1><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><D0A3><EFBFBD>
	// <20><>νtessellation<6F><6E><EFBFBD><EFBFBD>˼<EFBFBD><CBBC><EFBFBD><EFBFBD>Բ׶<D4B2>ĵ<EFBFBD><C4B5><EFBFBD><EFBFBD>ı<EFBFBD>Ե<EFBFBD>Ķ<EFBFBD><C4B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	class ConeBuilder
	{
	public:
		//tessellation<6F>µĶ<C2B5><C4B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		static SizeT VertexCount(SizeT tessellation);
		//tessellation<6F><6E><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		static SizeT IndexCount(SizeT tessellation);
		// set indices
		static void SetIndices(ushort* buffer, SizeT tessellation);
		// buffer: vertex buffer, vertexSize: a vertex element's size, posBias: the starting location(in bytes) of position data in a vertex element
		// tessellation: tessellation, r: the radius of bottom, topHeight: the cone's height, center: the centre of bottom
		template<typename T>
		static void SetPositions(T* buffer, SizeT vertexSize, SizeT posBias, SizeT tessellation, float r, float topHeight, const Math::float3& center);
		// buffer: vertex buffer, vertexSize: a vertex element's size, normalBias: the starting location(in bytes) of normal data in a vertex element
		// tessellation: tessellation
		// posBuffer: vertex buffer, posBufferVertexSize: a vertex element's size of posBuffer, posBias: the starting location(in bytes) of position data in a vertex element of posBuffer
		template<typename T1, typename T2>
		static void SetNormals(T1* buffer, SizeT vertexSize, SizeT normalBias, SizeT tessellation, const T2* posBuffer, SizeT posBufferVertexSize, SizeT posBias);

	private:
		static void setPositions(ubyte* buffer, SizeT vertexSize, SizeT posBias, SizeT tessellation, float r, float topHeight, const Math::float3& center);
		static void setNormals(ubyte* buffer, SizeT vertexSize, SizeT normalBias, SizeT tessellation, const ubyte* posBuffer, SizeT posBufferVertexSize, SizeT posBias);
		static void setCircleVector(float angle, Math::float3& dir);
		static void calBottomNormal(elem_iterator_const<Math::float3> begin, SizeT tessellation, Math::float3& bottomNormal);
		static void calBottomSidePosNormal(const Math::float3& curPos, const Math::float3& nextPos, const Math::float3& prePos, const Math::float3& topPos, const Math::float3& bottomNormal, Math::float3& normal);
		static void calNormal(const Math::float3& point0, const Math::float3& point1, const Math::float3& point2, Math::float3& normal);
		ConeBuilder();
	};

	template<typename T>
	inline void ConeBuilder::SetPositions(T* buffer, SizeT vertexSize, SizeT posBias, SizeT tessellation, float r, float topHeight, const Math::float3& center)
	{
		setPositions(reinterpret_cast<ubyte*>(buffer), vertexSize, posBias, tessellation, r, topHeight, center);
	}
	template<typename T1, typename T2>
	inline void ConeBuilder::SetNormals(T1* buffer, SizeT vertexSize, SizeT normalBias, SizeT tessellation, const T2* posBuffer, SizeT posBufferVertexSize, SizeT posBias)
	{
		setNormals(reinterpret_cast<ubyte*>(buffer),vertexSize,normalBias,tessellation,
					reinterpret_cast<const ubyte*>(posBuffer), posBufferVertexSize, posBias);
	}


	inline SizeT ConeBuilder::VertexCount(SizeT tessellation)
	{
		n_assert(tessellation > 2);
		return CONE_VERTEX_COUNT(tessellation);
	}

	inline SizeT ConeBuilder::IndexCount(SizeT tessellation)
	{
		n_assert(tessellation > 2);
		return CONE_INDEX_COUNT(tessellation);
	}
}
#endif //__CONE_BUILDER_H__