// Load3DS.h: interface for the CLoad3DS class.
//     原始代碼來自：GameTutorials
//     改編：
//     沈陽藍雨視景科技
//     http://www.bvrain.com
//     bvrain@163.com  chglei@163.com
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_LOAD3DS_H__69E7E7AC_7A07_4479_9687_AC19CED0E3CF__INCLUDED_)
#define AFX_LOAD3DS_H__69E7E7AC_7A07_4479_9687_AC19CED0E3CF__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "3dmath.h"
//向量STL
#include <vector>
using namespace std;

//>------ Primary Chunk, at the beginning of each file
#define PRIMARY       0x4D4D

//>------ Main Chunks
#define OBJECTINFO    0x3D3D				// This gives the version of the mesh and is found right before the material and object information
#define VERSION       0x0002				// This gives the version of the .3ds file
#define EDITKEYFRAME  0xB000				// This is the header for all of the key frame info

//>------ sub defines of OBJECTINFO
#define MATERIAL	  0xAFFF				// This stored the texture info
#define OBJECT		  0x4000				// This stores the faces, vertices, etc...

//>------ sub defines of MATERIAL
#define MATNAME       0xA000				// This holds the material name
#define MATDIFFUSE    0xA020				// This holds the color of the object/material
#define MATMAP        0xA200				// This is a header for a new material
#define MATMAPFILE    0xA300				// This holds the file name of the texture

#define OBJECT_MESH   0x4100				// This lets us know that we are reading a new object

//>------ sub defines of OBJECT_MESH
#define OBJECT_VERTICES     0x4110			// The objects vertices
#define OBJECT_FACES		0x4120			// The objects faces
#define OBJECT_MATERIAL		0x4130			// This is found if the object has a material, either texture map or color
#define OBJECT_UV			0x4140			// The UV texture coordinates


// This class handles all of the loading code
class CLoad3DS
{
//把這幾個結構體聲明到類里面，使封裝更徹底
public:
	// Here is our structure for our 3DS indicies (since .3DS stores 4 unsigned shorts)
	struct tIndices {							

		unsigned short a, b, c, bVisible;		// This will hold point1, 2, and 3 index's into the vertex array plus a visible flag
	};

	// This holds the chunk info
	struct tChunk
	{
		unsigned short int ID;					// The chunk's ID		
		unsigned int length;					// The length of the chunk
		unsigned int bytesRead;					// The amount of bytes read within that chunk
	};

	// This is our face structure.  This is is used for indexing into the vertex	
	// and texture coordinate arrays.  From this information we know which vertices
	// from our vertex array go to which face, along with the correct texture coordinates.
	struct tFace
	{
		int vertIndex[3];			// indicies for the verts that make up this triangle
		int coordIndex[3];			// indicies for the tex coords to texture this face
	};

	// This holds the information for a material.  It may be a texture map of a color.
	// Some of these are not used, but I left them because you will want to eventually
	// read in the UV tile ratio and the UV tile offset for some models.
	struct tMaterialInfo
	{
		char  strName[255];			// The texture name
		char  strFile[255];			// The texture file name (If this is set it's a texture map)
		BYTE  color[3];				// The color of the object (R, G, B)
		int   texureId;				// the texture ID
		float uTile;				// u tiling of texture  (Currently not used)
		float vTile;				// v tiling of texture	(Currently not used)
		float uOffset;			    // u offset of texture	(Currently not used)
		float vOffset;				// v offset of texture	(Currently not used)
	} ;
	//材料引用類
	class tMatREF
	{
	public:
		int nMaterialID;
		USHORT *pFaceIndexs;
		int nFaceNum;
		bool bHasTexture;
	public:
		tMatREF()
		{
			nMaterialID=-1;
			nFaceNum=0;
			pFaceIndexs=NULL;
			bHasTexture=false;
		}
	};

	// This holds all the information for our model/scene. 
	// You should eventually turn into a robust class that 
	// has loading/drawing/querying functions like:
	// LoadModel(...); DrawObject(...); DrawModel(...); DestroyModel(...);
	struct t3DObject 
	{
		int  numOfVerts;			// The number of verts in the model
		int  numOfFaces;			// The number of faces in the model
		int  numTexVertex;			// The number of texture coordinates
		int  numOfMaterials;		// the 材料數量
		int  materialID;			// The texture ID to use, which is the index into our texture array
		bool bHasTexture;			// This is TRUE if there is a texture map for this object
		char strName[255];			// The name of the object
		CVector3  *pVerts;			// The object's vertices
		CVector3  *pNormals;		// The object's normals
		CVector2  *pTexVerts;		// The texture's UV coordinates
		tFace *pFaces;				// The faces information of the object
		tMatREF	      *pMaterialREFS;// 材料IDS
		
	};

	// This holds our model information.  This should also turn into a robust class.
	// We use STL's (Standard Template Library) vector class to ease our link list burdens. :)
	struct t3DModel 
	{
		int numOfObjects;					// The number of objects in the model
		int numOfMaterials;					// The number of materials for the model
		//改名了	
		vector<tMaterialInfo> vctMaterials;	// The list of material information (Textures and colors)
		vector<t3DObject> vctObjects;			// The object list for our model
	};

public:
	//構造
	CLoad3DS();								
	//析構
	~CLoad3DS();
	// 載入3ds文件
	bool Import3DS(t3DModel *pModel, char *strFileName);

private:
	// This reads in a string and saves it in the char array passed in
	int GetString(char *);

	// This reads the next chunk
	void ReadChunk(tChunk *);

	// This reads the next large chunk
	void ProcessNextChunk(t3DModel *pModel, tChunk *);

	// This reads the object chunks
	void ProcessNextObjectChunk(t3DModel *pModel, t3DObject *pObject, tChunk *);

	// This reads the material chunks
	void ProcessNextMaterialChunk(t3DModel *pModel, tChunk *);

	// This reads the RGB value for the object's color
	void ReadColorChunk(tMaterialInfo *pMaterial, tChunk *pChunk);

	// This reads the objects vertices
	void ReadVertices(t3DObject *pObject, tChunk *);

	// This reads the objects face information
	void ReadVertexIndices(t3DObject *pObject, tChunk *);

	// This reads the texture coodinates of the object
	void ReadUVCoordinates(t3DObject *pObject, tChunk *);

	// This reads in the material name assigned to the object and sets the materialID
	void ReadObjectMaterial(t3DModel *pModel, t3DObject *pObject, tChunk *pPreviousChunk,vector<tMatREF*> *pvmatids);
	
	// This computes the vertex normals for the object (used for lighting)
	void ComputeNormals(t3DModel *pModel);

	// This frees memory and closes the file
	void CleanUp();
	
	// The file pointer
	FILE *m_FilePointer;
};


#endif // !defined(AFX_LOAD3DS_H__69E7E7AC_7A07_4479_9687_AC19CED0E3CF__INCLUDED_)