#include <windows.h>								// Header File For Windows#include <stdlib.h>                          //where free function is declared#include <stdio.h>							// Header File For Standard Input/Output ( NEW )#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#define CDS_FULLSCREEN 4HGLRC           hRC=NULL;							// Permanent Rendering ContextHDC             hDC=NULL;							// Private GDI Device ContextHWND            hWnd=NULL;							// Holds Our Window HandleHINSTANCE       hInstance;							// Holds The Instance Of The Applicationbool	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		rtri;   					// Angle For The Triangle ( NEW )GLfloat		rquad;						// Angle For The Quad     ( NEW )GLfloat		xrot;								// X Rotation ( NEW )GLfloat		yrot;								// Y Rotation ( NEW )GLfloat		zrot;								// Z Rotation ( NEW )GLuint		texture[1];							// Storage For One Texture ( NEW )LRESULT	CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);				// Declaration For WndProcAUX_RGBImageRec *LoadBMP(char *Filename)					// Loads A Bitmap Image{	FILE *File=NULL;							// File Handleif (!Filename)								// Make Sure A Filename Was Given	{		return NULL;							// If Not Return NULL	}File=fopen(Filename,"r");						// Check To See If The File Existsif (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}int LoadGLTextures()								// Load Bitmaps And Convert To Textures{int Status=FALSE;							// Status IndicatorAUX_RGBImageRec *TextureImage[1];					// Create Storage Space For The Texturememset(TextureImage,0,sizeof(void *)*1);				// Set The Pointer To NULLmemset(TextureImage,0,sizeof(void *)*1);				// Set The Pointer To NULL// Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit	if (TextureImage[0]=LoadBMP("c://My Documents/My Pictures/cloth02"))	{		Status=TRUE;							// Set The Status To TRUEglGenTextures(1, &texture[0]);					// Create The Texture		// Typical Texture Generation Using Data From The Bitmap		glBindTexture(GL_TEXTURE_2D, texture[0]);// Generate The Texture		glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);	// Linear Filtering		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);	// Linear Filtering	}if (TextureImage[0])							// If Texture Exists	{		if (TextureImage[0]->data)					// If Texture Image Exists		{			free(TextureImage[0]->data);				// Free The Texture Image Memory		}		free(TextureImage[0]);						// Free The Image Structure	}return Status;								// 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 ViewportglMatrixMode(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,0.1f,100.0f);	glMatrixMode(GL_MODELVIEW);						// Select The Modelview Matrix	glLoadIdentity();							// Reset The Modelview Matrix}int InitGL(GLvoid)								// All Setup For OpenGL Goes Here{	if (!LoadGLTextures())							// Jump To Texture Loading Routine ( NEW )	{		return FALSE;							// If Texture Didn't Load Return FALSE ( NEW )	}	glEnable(GL_TEXTURE_2D);						// Enable Texture Mapping ( NEW )	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	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 Screen And Depth Buffer	glLoadIdentity();							// Reset The Current Matrix	glTranslatef(0.0f,0.0f,-5.0f);						// Move Into The Screen 5 UnitsglRotatef(xrot,1.0f,0.0f,0.0f);						// Rotate On The X Axis	glRotatef(yrot,0.0f,1.0f,0.0f);						// Rotate On The Y Axis	glRotatef(zrot,0.0f,0.0f,1.0f);						// Rotate On The Z AxisglBindTexture(GL_TEXTURE_2D, texture[0]);				// Select Our TextureglBegin(GL_QUADS);		// Front Face		glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);	// Top Left Of The Texture and Quad		// Back Face		glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);	// Bottom Left Of The Texture and Quad		// Top Face		glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);	// Top Right Of The Texture and Quad		// Bottom Face		glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);	// Bottom Right Of The Texture and Quad		// Right face		glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);	// Bottom Left Of The Texture and Quad		// Left Face		glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);	// Top Left Of The Texture and Quad	glEnd();xrot+=0.3f;								// X Axis Rotation	yrot+=0.2f;								// Y Axis Rotation	zrot+=0.4f;								// Z Axis Rotation	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	}}BOOL CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag){GLuint		PixelFormat;						// Holds The Results After Searching For A MatchWNDCLASS	wc;							// Windows Class StructureDWORD		dwExstyle;						// Window Extended style	DWORD		dwstyle;						// Window styleRECT 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 Heightfullscreen=fullscreenflag;						// Set The Global Fullscreen FlaghInstance		= GetModuleHandle(NULL);			// Grab An Instance For Our Window	wc.style		= CS_HREDRAW | CS_VREDRAW | CS_OWNDC;		// Redraw On Move, 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 Nameif (!RegisterClass(&wc))						// Attempt To Register The Window Class	{		MessageBox(NULL,"Failed To Register The Window Class.","ERROR",MB_OK|MB_ICONEXCLAMATION);		return FALSE;							// Exit And 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 Run In A Window.			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;				// Select Windowed Mode (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;					// Exit And 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 Sizeif (!(hWnd=CreateWindowEx(	dwExstyle,				// Extended style For The Window					"OpenGL",				// Class Name					title,					// Window Title					WS_CLIPSIBLINGS |			// Required Window style					WS_CLIPCHILDREN |			// Required Window style					dwstyle,				// Selected Window style					0, 0,					// Window Position					WindowRect.right-WindowRect.left,	// Calculate Adjusted Window Width					WindowRect.bottom-WindowRect.top,	// Calculate Adjusted Window Height					NULL,					// No Parent Window					NULL,					// No Menu					hInstance,				// Instance					NULL)))					// Don't 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 Screenif (!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// 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("Maxin Software",640,480,16,fullscreen))	{		return 0;							// Quit If Window Was Not Created	}while(!done)								// Loop That Runs Until done=TRUE	{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)						// Program Active?			{				if (keys[VK_ESCAPE])				// Was ESC Pressed?				{					done=TRUE;				// ESC Signalled A Quit				}				else						// Not Time To Quit, Update Screen				{		DrawGLScene();				// Draw The Scene					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("NeHe's OpenGL Framework",640,480,16,fullscreen))				{					return 0;				// Quit If Window Was Not Created				}			}		}	}// Shutdown	KillGLWindow();								// Kill The Window	return (msg.wParam);							// Exit The Program}