Model3D.h

// Model3D.h: interface for the Model3D class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_MODEL3D_H__1B2D0CFD_4ADD_4AC8_83EC_6C5CEA86ABB1__INCLUDED_)
#define AFX_MODEL3D_H__1B2D0CFD_4ADD_4AC8_83EC_6C5CEA86ABB1__INCLUDED_

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

#include <windows.h>
#include <math.h>
#include "GLee.h"
//#include <gl\gl.h>										// Header File For The OpenGL32 Library
//#include "libraries\bmp\bmp.h"  // replacement for glaux.h

#include <vector>
using namespace std;


// This is our 3D point class.  This will be used to store the vertices
// of our model.
struct tVector3 {
	float x, y, z;
};

// This is our 2D point class.  This will be used to store the UV coordinates.
struct tVector2 {
	float x, y;
};

// 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)
};

// 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  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
	tVector3  *pVerts;			// The object's vertices
	tVector3  *pNormals;		// The object's normals
	tVector2  *pTexVerts;		// The texture's UV coordinates
	tFace *pFaces;				// The faces information of the object
};

// 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
	vector<tMaterialInfo> pMaterials;	// The list of material information (Textures and colors)
	vector<t3DObject> pObject;			// The object list for our model
};

//>------ 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 VERSION3DS    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


// 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
};

struct t3DModel;
struct t3DObject;
struct tMaterialInfo;

// This class handles all of the loading code
class CLoad3DS
{
public:
	CLoad3DS();								// This inits the data members

	// This is the function that you call to load the 3DS
	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);
	
	// 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;
	
	// These are used through the loading process to hold the chunk information
	tChunk *m_CurrentChunk;
	tChunk *m_TempChunk;
};



class Model3D  
{
public:
	Model3D();
	virtual ~Model3D();

	bool LoadModel(char* strFileName, char* strDirectory = NULL);

	// Delete the model from the graphics card
	void FreeDisplayList(void);
	
	// Build

	//
	void ToggleViewMode(void);

private:
	GLuint m_Textures[40];
	GLuint m_OneTextureID;
	GLuint m_OneDisplayID;
	t3DModel m_3DModel;
	int m_nViewMode;

	//AUX_RGBImageRec* _LoadBMP(char* Filename);
	//int _LoadFontTexture(char* strFileName, int TextureIDIndex);

	// Quickly load an image onto the graphics card (default filter settings)
	int _QuickLoadTexture(char* sFileName, int TextureIDIndex);

	void _RenderModel(void);

	// Build the Display List
	void BuildDisplayList(void);
public:
	// Render the Model (From a display list)
	void RenderModel(void);
};

#endif // !defined(AFX_MODEL3D_H__1B2D0CFD_4ADD_4AC8_83EC_6C5CEA86ABB1__INCLUDED_)