/*	MilkshapeModel.cpp		Loads and renders a Milkshape3D model. 	Author:	Brett Porter	Email: brettporter@yahoo.com	Website: http://www.geocities.com/brettporter/	Copyright (C)2000, Brett Porter. All Rights Reserved.	This file may be used only as long as this copyright notice remains intact.*/#include <windows.h>		// Header File For Windows#include <gl\gl.h>			// Header File For The OpenGL32 Library#include "MilkshapeModel.h"#include <fstream>using namespace std;MilkshapeModel::MilkshapeModel(){}MilkshapeModel::~MilkshapeModel(){}/* 	MS3D STRUCTURES */// byte-align structures#ifdef _MSC_VER#	pragma pack( push, packing )#	pragma pack( 1 )#	define PACK_STRUCT#elif defined( __GNUC__ )#	define PACK_STRUCT	__attribute__((packed))#else#	error you must byte-align these structures with the appropriate compiler directives#endiftypedef unsigned char byte;typedef unsigned short word;// File headerstruct MS3DHeader{	char m_ID[10];	int m_version;} PACK_STRUCT;// Vertex informationstruct MS3DVertex{	byte m_flags;	float m_vertex[3];	char m_boneID;	byte m_refCount;} PACK_STRUCT;// Triangle informationstruct MS3DTriangle{	word m_flags;	word m_vertexIndices[3];	float m_vertexNormals[3][3];	float m_s[3], m_t[3];	byte m_smoothingGroup;	byte m_groupIndex;} PACK_STRUCT;// Material informationstruct MS3DMaterial{    char m_name[32];    float m_ambient[4];    float m_diffuse[4];    float m_specular[4];    float m_emissive[4];    float m_shininess;	// 0.0f - 128.0f    float m_transparency;	// 0.0f - 1.0f    byte m_mode;	// 0, 1, 2 is unused now    char m_texture[128];    char m_alphamap[128];} PACK_STRUCT;//	Joint informationstruct MS3DJoint{	byte m_flags;	char m_name[32];	char m_parentName[32];	float m_rotation[3];	float m_translation[3];	word m_numRotationKeyframes;	word m_numTranslationKeyframes;} PACK_STRUCT;// Keyframe datastruct MS3DKeyframe{	float m_time;	float m_parameter[3];} PACK_STRUCT;// Default alignment#ifdef _MSC_VER#	pragma pack( pop, packing )#endif#undef PACK_STRUCTbool MilkshapeModel::loadModelData( const char *filename ){	ifstream inputFile( filename, ios::in | ios::binary);	if ( inputFile.fail())		return false;	// "Couldn't open the model file."	inputFile.seekg( 0, ios::end );	long fileSize = inputFile.tellg();	inputFile.seekg( 0, ios::beg );	byte *pBuffer = new byte[fileSize];	inputFile.read( pBuffer, fileSize );	inputFile.close();	const byte *pPtr = pBuffer;	MS3DHeader *pHeader = ( MS3DHeader* )pPtr;	pPtr += sizeof( MS3DHeader );	if ( strncmp( pHeader->m_ID, "MS3D000000", 10 ) != 0 )		return false; // "Not a valid Milkshape3D model file."	if ( pHeader->m_version < 3 || pHeader->m_version > 4 )		return false; // "Unhandled file version. Only Milkshape3D Version 1.3 and 1.4 is supported." );	int nVertices = *( word* )pPtr; 	m_numVertices = nVertices;	m_pVertices = new Vertex[nVertices];	pPtr += sizeof( word );	int i;	for ( i = 0; i < nVertices; i++ )	{		MS3DVertex *pVertex = ( MS3DVertex* )pPtr;		m_pVertices.m_boneID = pVertex->m_boneID;		memcpy( m_pVertices.m_location, pVertex->m_vertex, sizeof( float )*3 );		pPtr += sizeof( MS3DVertex );	}	int nTriangles = *( word* )pPtr;	m_numTriangles = nTriangles;	m_pTriangles = new Triangle[nTriangles];	pPtr += sizeof( word );	for ( i = 0; i < nTriangles; i++ )	{		MS3DTriangle *pTriangle = ( MS3DTriangle* )pPtr;		int vertexIndices[3] = { pTriangle->m_vertexIndices[0], pTriangle->m_vertexIndices[1], pTriangle->m_vertexIndices[2] };		float t[3] = { 1.0f-pTriangle->m_t[0], 1.0f-pTriangle->m_t[1], 1.0f-pTriangle->m_t[2] };		memcpy( m_pTriangles.m_vertexNormals, pTriangle->m_vertexNormals, sizeof( float )*3*3 );		memcpy( m_pTriangles.m_s, pTriangle->m_s, sizeof( float )*3 );		memcpy( m_pTriangles.m_t, t, sizeof( float )*3 );		memcpy( m_pTriangles.m_vertexIndices, vertexIndices, sizeof( int )*3 );		pPtr += sizeof( MS3DTriangle );	}	int nGroups = *( word* )pPtr;	m_numMeshes = nGroups;	m_pMeshes = new Mesh[nGroups];	pPtr += sizeof( word );	for ( i = 0; i < nGroups; i++ )	{		pPtr += sizeof( byte );	// flags		pPtr += 32;				// name		word nTriangles = *( word* )pPtr;		pPtr += sizeof( word );		int *pTriangleIndices = new int[nTriangles];		for ( int j = 0; j < nTriangles; j++ )		{			pTriangleIndices[j] = *( word* )pPtr;			pPtr += sizeof( word );		}		char materialIndex = *( char* )pPtr;		pPtr += sizeof( char );			m_pMeshes.m_materialIndex = materialIndex;		m_pMeshes.m_numTriangles = nTriangles;		m_pMeshes.m_pTriangleIndices = pTriangleIndices;	}	int nMaterials = *( word* )pPtr;	m_numMaterials = nMaterials;	m_pMaterials = new Material[nMaterials];	pPtr += sizeof( word );	for ( i = 0; i < nMaterials; i++ )	{		MS3DMaterial *pMaterial = ( MS3DMaterial* )pPtr;		memcpy( m_pMaterials.m_ambient, pMaterial->m_ambient, sizeof( float )*4 );		memcpy( m_pMaterials.m_diffuse, pMaterial->m_diffuse, sizeof( float )*4 );		memcpy( m_pMaterials.m_specular, pMaterial->m_specular, sizeof( float )*4 );		memcpy( m_pMaterials.m_emissive, pMaterial->m_emissive, sizeof( float )*4 );		m_pMaterials.m_shininess = pMaterial->m_shininess;		m_pMaterials.m_pTextureFilename = new char[strlen( pMaterial->m_texture )+1];		strcpy( m_pMaterials.m_pTextureFilename, pMaterial->m_texture );		pPtr += sizeof( MS3DMaterial );	}	reloadTextures();	delete[] pBuffer;	return true;}

/* *		This Code Was Created By Brett Porter For NeHe Productions 2000 *		Visit NeHe Productions At http://nehe.gamedev.net *		 *		Visit Brett Porter's Web Page at *		http://www.geocities.com/brettporter/programming *		Conversion to Visual Studio.NET done by GRANT JAMES(ZEUS) */#include <windows.h>												// Header File For Windows#include <stdio.h>													// Header File For Standard Input/Output#include <gl\gl.h>													// Header File For The OpenGL32 Library#include <gl\glu.h>													// Header File For The GLu32 Library#include <gl\glaux.h>												// Header File For The Glaux Library#include "MilkshapeModel.h"											// Header File For Milkshape File#pragma comment( lib, "opengl32.lib" )								// Search For OpenGL32.lib While Linking ( NEW )#pragma comment( lib, "glu32.lib" )									// Search For GLu32.lib While Linking    ( NEW )#pragma comment( lib, "glaux.lib" )									// Search For GLaux.lib While Linking    ( NEW )HDC			hDC=NULL;												// Private GDI Device ContextHGLRC		hRC=NULL;												// Permanent Rendering ContextHWND		hWnd=NULL;												// Holds Our Window HandleHINSTANCE	hInstance;												// Holds The Instance Of The ApplicationModel *pModel = NULL;												// Holds The Model Databool	keys[256];													// Array Used For The Keyboard Routinebool	active=TRUE;												// Window Active Flag Set To TRUE By Defaultbool	fullscreen=TRUE;											// Fullscreen Flag Set To Fullscreen Mode By DefaultGLfloat	yrot=0.0f;													// Y RotationGLfloat LightAmbient[]=		{ 0.5f, 0.5f, 0.5f, 1.0f };GLfloat LightDiffuse[]=		{ 1.0f, 1.0f, 1.0f, 1.0f };GLfloat LightPosition[]=	{ 0.0f, 0.0f, 2.0f, 1.0f };LRESULT	CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);				// Declaration For WndProcAUX_RGBImageRec *LoadBMP(const char *Filename)						// Loads A Bitmap Image{	FILE *File=NULL;												// File Handle	if (!Filename)													// Make Sure A Filename Was Given	{		return NULL;												// If Not Return NULL	}	File=fopen(Filename,"r");										// Check To See If The File Exists	if (File)														// Does The File Exist?	{		fclose(File);												// Close The Handle		return auxDIBImageLoad(Filename);							// Load The Bitmap And Return A Pointer	}	return NULL;													// If Load Failed Return NULL}GLuint LoadGLTexture( const char *filename )						// Load Bitmaps And Convert To Textures{	AUX_RGBImageRec *pImage;										// Create Storage Space For The Texture	GLuint texture = 0;												// Texture ID	pImage = LoadBMP( filename );									// Loads The Bitmap Specified By filename	// Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit	if ( pImage != NULL && pImage->data != NULL )					// If Texture Image Exists	{		glGenTextures(1, &texture);									// Create The Texture		// Typical Texture Generation Using Data From The Bitmap		glBindTexture(GL_TEXTURE_2D, texture);		glTexImage2D(GL_TEXTURE_2D, 0, 3, pImage->sizeX, pImage->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, pImage->data);		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);		free(pImage->data);											// Free The Texture Image Memory		free(pImage);												// Free The Image Structure	}	return texture;													// Return The Status}GLvoid ReSizeGLScene(GLsizei width, GLsizei height)					// Resize And Initialize The GL Window{	if (height==0)													// Prevent A Divide By Zero By	{		height=1;													// Making Height Equal One	}	glViewport(0,0,width,height);									// Reset The Current Viewport	glMatrixMode(GL_PROJECTION);									// Select The Projection Matrix	glLoadIdentity();												// Reset The Projection Matrix	// Calculate The Aspect Ratio Of The Window	gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,1.0f,1000.0f);	// View Depth of 1000	glMatrixMode(GL_MODELVIEW);										// Select The Modelview Matrix	glLoadIdentity();												// Reset The Modelview Matrix}int InitGL(GLvoid)													// All Setup For OpenGL Goes Here{	pModel->reloadTextures();										// Loads Model Textures	glEnable(GL_TEXTURE_2D);							// Enable Texture Mapping	glShadeModel(GL_SMOOTH);							// Enable Smooth Shading	glClearColor(0.0f, 0.0f, 0.0f, 0.5f);				// Black Background	glClearDepth(1.0f);									// Depth Buffer Setup	glEnable(GL_DEPTH_TEST);							// Enables Depth Testing	glDepthFunc(GL_LEQUAL);								// The Type Of Depth Testing To Do	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);	// Really Nice Perspective Calculations	glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);		// Setup The Ambient Light	glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse);		// Setup The Diffuse Light	glLightfv(GL_LIGHT1, GL_POSITION,LightPosition);	// Position The Light	glEnable(GL_LIGHT1);								// Enable Light One		return TRUE;													// Initialization Went OK}int DrawGLScene(GLvoid)												// Here's Where We Do All The Drawing{	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);				// Clear The Screen And The Depth Buffer	glLoadIdentity();												// Reset The Modelview Matrix	gluLookAt( 75, 75, 75, 0, 0, 0, 0, 1, 0 );						// (3) Eye Postion (3) Center Point (3) Y-Axis Up Vector	pModel->draw();													// Draw The Model	return TRUE;													// Keep Going}GLvoid KillGLWindow(GLvoid)											// Properly Kill The Window{	if (fullscreen)													// Are We In Fullscreen Mode?	{		ChangeDisplaySettings(NULL,0);								// If So Switch Back To The Desktop		ShowCursor(TRUE);											// Show Mouse Pointer	}	if (hRC)														// Do We Have A Rendering Context?	{		if (!wglMakeCurrent(NULL,NULL))								// Are We Able To Release The DC And RC Contexts?		{			MessageBox(NULL,"Release Of DC And RC Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);		}		if (!wglDeleteContext(hRC))									// Are We Able To Delete The RC?		{			MessageBox(NULL,"Release Rendering Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);		}		hRC=NULL;													// Set RC To NULL	}	if (hDC && !ReleaseDC(hWnd,hDC))								// Are We Able To Release The DC	{		MessageBox(NULL,"Release Device Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);		hDC=NULL;													// Set DC To NULL	}	if (hWnd && !DestroyWindow(hWnd))								// Are We Able To Destroy The Window?	{		MessageBox(NULL,"Could Not Release hWnd.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);		hWnd=NULL;													// Set hWnd To NULL	}	if (!UnregisterClass("OpenGL",hInstance))						// Are We Able To Unregister Class	{		MessageBox(NULL,"Could Not Unregister Class.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);		hInstance=NULL;												// Set hInstance To NULL	}}/*	This Code Creates Our OpenGL Window.  Parameters Are:					* *	title			- Title To Appear At The Top Of The Window				* *	width			- Width Of The GL Window Or Fullscreen Mode				* *	height			- Height Of The GL Window Or Fullscreen Mode			* *	bits			- Number Of Bits To Use For Color (8/16/24/32)			* *	fullscreenflag	- Use Fullscreen Mode (TRUE) Or Windowed Mode (FALSE)	*/ BOOL CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag){	GLuint		PixelFormat;										// Holds The Results After Searching For A Match	WNDCLASS	wc;													// Windows Class Structure	DWORD		dwExstyle;											// Window Extended style	DWORD		dwstyle;											// Window style	RECT		WindowRect;											// Grabs Rectangle Upper Left / Lower Right Values	WindowRect.left=(long)0;										// Set Left Value To 0	WindowRect.right=(long)width;									// Set Right Value To Requested Width	WindowRect.top=(long)0;											// Set Top Value To 0	WindowRect.bottom=(long)height;									// Set Bottom Value To Requested Height	fullscreen=fullscreenflag;										// Set The Global Fullscreen Flag	hInstance			= GetModuleHandle(NULL);					// Grab An Instance For Our Window	wc.style			= CS_HREDRAW | CS_VREDRAW | CS_OWNDC;		// Redraw On Size, And Own DC For Window.	wc.lpfnWndProc		= (WNDPROC) WndProc;						// WndProc Handles Messages	wc.cbClsExtra		= 0;										// No Extra Window Data	wc.cbWndExtra		= 0;										// No Extra Window Data	wc.hInstance		= hInstance;								// Set The Instance	wc.hIcon			= LoadIcon(NULL, IDI_WINLOGO);				// Load The Default Icon	wc.hCursor			= LoadCursor(NULL, IDC_ARROW);				// Load The Arrow Pointer	wc.hbrBackground	= NULL;										// No Background Required For GL	wc.lpszMenuName		= NULL;										// We Don't Want A Menu	wc.lpszClassName	= "OpenGL";									// Set The Class Name	if (!RegisterClass(&wc))										// Attempt To Register The Window Class	{		MessageBox(NULL,"Failed To Register The Window Class.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;												// Return FALSE	}		if (fullscreen)													// Attempt Fullscreen Mode?	{		DEVMODE dmScreenSettings;									// Device Mode		memset(&dmScreenSettings,0,sizeof(dmScreenSettings));		// Makes Sure Memory's Cleared		dmScreenSettings.dmSize=sizeof(dmScreenSettings);			// Size Of The Devmode Structure		dmScreenSettings.dmPelsWidth	= width;					// Selected Screen Width		dmScreenSettings.dmPelsHeight	= height;					// Selected Screen Height		dmScreenSettings.dmBitsPerPel	= bits;						// Selected Bits Per Pixel		dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;		// Try To Set Selected Mode And Get Results.  NOTE: CDS_FULLSCREEN Gets Rid Of Start Bar.		if (ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN)!=DISP_CHANGE_SUCCESSFUL)		{			// If The Mode Fails, Offer Two Options.  Quit Or Use Windowed Mode.			if (MessageBox(NULL,"The Requested Fullscreen Mode Is Not Supported By\nYour Video Card. Use Windowed Mode Instead?","NeHe GL",MB_YESNO|MB_ICONEXCLAMATION)==IDYES)			{				fullscreen=FALSE;									// Windowed Mode Selected.  Fullscreen = FALSE			}			else			{				// Pop Up A Message Box Letting User Know The Program Is Closing.				MessageBox(NULL,"Program Will Now Close.","ERROR",MB_OK|MB_ICONSTOP);				return FALSE;										// Return FALSE			}		}	}	if (fullscreen)													// Are We Still In Fullscreen Mode?	{		dwExstyle=WS_EX_APPWINDOW;									// Window Extended style		dwstyle=WS_POPUP;											// Windows style		ShowCursor(FALSE);											// Hide Mouse Pointer	}	else	{		dwExstyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;				// Window Extended style		dwstyle=WS_OVERLAPPEDWINDOW;								// Windows style	}	AdjustWindowRectEx(&WindowRect, dwstyle, FALSE, dwExstyle);		// Adjust Window To True Requested Size	// Create The Window	if (!(hWnd=CreateWindowEx(	dwExstyle,							// Extended style For The Window								"OpenGL",							// Class Name								title,								// Window Title								dwstyle |							// Defined Window style								WS_CLIPSIBLINGS |					// Required Window style								WS_CLIPCHILDREN,					// Required Window style								0, 0,								// Window Position								WindowRect.right-WindowRect.left,	// Calculate Window Width								WindowRect.bottom-WindowRect.top,	// Calculate Window Height								NULL,								// No Parent Window								NULL,								// No Menu								hInstance,							// Instance								NULL)))								// Dont Pass Anything To WM_CREATE	{		KillGLWindow();												// Reset The Display		MessageBox(NULL,"Window Creation Error.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;												// Return FALSE	}	static	PIXELFORMATDESCRIPTOR pfd=								// pfd Tells Windows How We Want Things To Be	{		sizeof(PIXELFORMATDESCRIPTOR),								// Size Of This Pixel Format Descriptor		1,															// Version Number		PFD_DRAW_TO_WINDOW |										// Format Must Support Window		PFD_SUPPORT_OPENGL |										// Format Must Support OpenGL		PFD_DOUBLEBUFFER,											// Must Support Double Buffering		PFD_TYPE_RGBA,												// Request An RGBA Format		bits,														// Select Our Color Depth		0, 0, 0, 0, 0, 0,											// Color Bits Ignored		0,															// No Alpha Buffer		0,															// Shift Bit Ignored		0,															// No Accumulation Buffer		0, 0, 0, 0,													// Accumulation Bits Ignored		16,															// 16Bit Z-Buffer (Depth Buffer)  		0,															// No Stencil Buffer		0,															// No Auxiliary Buffer		PFD_MAIN_PLANE,												// Main Drawing Layer		0,															// Reserved		0, 0, 0														// Layer Masks Ignored	};		if (!(hDC=GetDC(hWnd)))											// Did We Get A Device Context?	{		KillGLWindow();												// Reset The Display		MessageBox(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;												// Return FALSE	}	if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd)))					// Did Windows Find A Matching Pixel Format?	{		KillGLWindow();												// Reset The Display		MessageBox(NULL,"Can't Find A Suitable PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;												// Return FALSE	}	if(!SetPixelFormat(hDC,PixelFormat,&pfd))						// Are We Able To Set The Pixel Format?	{		KillGLWindow();												// Reset The Display		MessageBox(NULL,"Can't Set The PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;												// Return FALSE	}	if (!(hRC=wglCreateContext(hDC)))								// Are We Able To Get A Rendering Context?	{		KillGLWindow();												// Reset The Display		MessageBox(NULL,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;												// Return FALSE	}	if(!wglMakeCurrent(hDC,hRC))									// Try To Activate The Rendering Context	{		KillGLWindow();												// Reset The Display		MessageBox(NULL,"Can't Activate The GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;												// Return FALSE	}	ShowWindow(hWnd,SW_SHOW);										// Show The Window	SetForegroundWindow(hWnd);										// Slightly Higher Priority	SetFocus(hWnd);													// Sets Keyboard Focus To The Window	ReSizeGLScene(width, height);									// Set Up Our Perspective GL Screen	if (!InitGL())													// Initialize Our Newly Created GL Window	{		KillGLWindow();												// Reset The Display		MessageBox(NULL,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;												// Return FALSE	}	return TRUE;													// Success}LRESULT CALLBACK WndProc(	HWND	hWnd,							// Handle For This Window							UINT	uMsg,							// Message For This Window							WPARAM	wParam,							// Additional Message Information							LPARAM	lParam)							// Additional Message Information{	switch (uMsg)													// Check For Windows Messages	{		case WM_ACTIVATE:											// Watch For Window Activate Message		{			if (!HIWORD(wParam))									// Check Minimization State			{				active=TRUE;										// Program Is Active			}			else			{				active=FALSE;										// Program Is No Longer Active			}			return 0;												// Return To The Message Loop		}		case WM_SYSCOMMAND:											// Intercept System Commands		{			switch (wParam)											// Check System Calls			{				case SC_SCREENSAVE:									// Screensaver Trying To Start?				case SC_MONITORPOWER:								// Monitor Trying To Enter Powersave?				return 0;											// Prevent From Happening			}			break;													// Exit		}		case WM_CLOSE:												// Did We Receive A Close Message?		{			PostQuitMessage(0);										// Send A Quit Message			return 0;												// Jump Back		}		case WM_KEYDOWN:											// Is A Key Being Held Down?		{			keys[wParam] = TRUE;									// If So, Mark It As TRUE			return 0;												// Jump Back		}		case WM_KEYUP:												// Has A Key Been Released?		{			keys[wParam] = FALSE;									// If So, Mark It As FALSE			return 0;												// Jump Back		}		case WM_SIZE:												// Resize The OpenGL Window		{			ReSizeGLScene(LOWORD(lParam),HIWORD(lParam));			// LoWord=Width, HiWord=Height			return 0;												// Jump Back		}	}	// Pass All Unhandled Messages To DefWindowProc	return DefWindowProc(hWnd,uMsg,wParam,lParam);}int WINAPI WinMain(	HINSTANCE	hInstance,							// Instance					HINSTANCE	hPrevInstance,						// Previous Instance					LPSTR		lpCmdLine,							// Command Line Parameters					int			nCmdShow)							// Window Show State{	MSG		msg;													// Windows Message Structure	BOOL	done=FALSE;												// Bool Variable To Exit Loop	pModel = new MilkshapeModel();									// Memory To Hold The Model	if ( pModel->loadModelData( "data/model.ms3d" ) == false )		// Loads The Model And Checks For Errors	{		MessageBox( NULL, "Couldn't load the model data\\model.ms3d", "Error", MB_OK | MB_ICONERROR );		return 0;													// If Model Didn't Load Quit	}	// Ask The User Which Screen Mode They Prefer	if (MessageBox(NULL,"Would You Like To Run In Fullscreen Mode?", "Start FullScreen?",MB_YESNO|MB_ICONQUESTION)==IDNO)	{		fullscreen=FALSE;											// Windowed Mode	}	// Create Our OpenGL Window	if (!CreateGLWindow("Brett Porter & NeHe's Model Rendering Tutorial",640,480,16,fullscreen))	{		return 0;													// Quit If Window Was Not Created	}	while(!done)													// Loop That Runs While done=FALSE	{		if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))					// Is There A Message Waiting?		{			if (msg.message==WM_QUIT)								// Have We Received A Quit Message?			{				done=TRUE;											// If So done=TRUE			}			else													// If Not, Deal With Window Messages			{				TranslateMessage(&msg);								// Translate The Message				DispatchMessage(&msg);								// Dispatch The Message			}		}		else														// If There Are No Messages		{			// Draw The Scene.  Watch For ESC Key And Quit Messages From DrawGLScene()			if ((active && !DrawGLScene()) || keys[VK_ESCAPE])		// Active?  Was There A Quit Received?			{				done=TRUE;											// ESC or DrawGLScene Signalled A Quit			}			else													// Not Time To Quit, Update Screen			{				SwapBuffers(hDC);									// Swap Buffers (Double Buffering)			}			if (keys[VK_F1])										// Is F1 Being Pressed?			{				keys[VK_F1]=FALSE;									// If So Make Key FALSE				KillGLWindow();										// Kill Our Current Window				fullscreen=!fullscreen;								// Toggle Fullscreen / Windowed Mode				// Recreate Our OpenGL Window				if (!CreateGLWindow("Brett Porter & NeHe's Model Rendering Tutorial",640,480,16,fullscreen))				{					return 0;										// Quit If Window Was Not Created				}			}		}	}	// Shutdown	KillGLWindow();													// Kill The Window	return (msg.wParam);											// Exit The Program}