Multi-font use.

  
/*
 *		This Code Was Created By Jeff Molofee 2000
 *		Modified by Shawn T. to handle (%3.2f, num) parameters.
 *		A HUGE Thanks To Fredric Echols For Cleaning Up
 *		And Optimizing The Base Code, Making It More Flexible!
 *		If You''ve Found This Code Useful, Please Let Me Know.
 *		Visit My Site At nehe.gamedev.net
 */

#include <windows.h>		// Header File For Windows
#include <math.h>			// Header File For Windows Math Library
#include <stdio.h>			// Header File For Standard Input/Output
#include <stdarg.h>			// Header File For Variable Argument Routines
#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

HDC			hDC=NULL;		// Private GDI Device Context
HGLRC		hRC=NULL;		// Permanent Rendering Context
HWND		hWnd=NULL;		// Holds Our Window Handle
HINSTANCE	hInstance;		// Holds The Instance Of The Application

GLuint	base, base2;				// Base Display List For The Font Set
GLfloat	cnt1;				// 1st Counter Used To Move Text & For Coloring
GLfloat	cnt2;				// 2nd Counter Used To Move Text & For Coloring

bool	keys[256];			// Array Used For The Keyboard Routine
bool	active=TRUE;		// Window Active Flag Set To TRUE By Default
bool	fullscreen=TRUE;	// Fullscreen Flag Set To Fullscreen Mode By Default

LRESULT	CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);	// Declaration For WndProc

unsigned BuildFont(const char *name)								// Build Our Bitmap Font
{
	HFONT	font;										// Windows Font ID
	HFONT	oldfont;									// Used For Good House Keeping

	unsigned base = glGenLists(96);								// Storage For 96 Characters

	font = CreateFont(	-24,							// Height Of Font
						0,								// Width Of Font
						0,								// Angle Of Escapement
						0,								// Orientation Angle
						FW_BOLD,						// Font Weight
						FALSE,							// Italic
						FALSE,							// Underline
						FALSE,							// Strikeout
						ANSI_CHARSET,					// Character Set Identifier
						OUT_TT_PRECIS,					// Output Precision
						CLIP_DEFAULT_PRECIS,			// Clipping Precision
						ANTIALIASED_QUALITY,			// Output Quality
						FF_DONTCARE|DEFAULT_PITCH,		// Family And Pitch
						name);					// Font Name

	oldfont = (HFONT)SelectObject(hDC, font);           // Selects The Font We Want
	wglUseFontBitmaps(hDC, 32, 96, base);				// Builds 96 Characters Starting At Character 32
	SelectObject(hDC, oldfont);							// Selects The Font We Want
	DeleteObject(font);									// Delete The Font
	return base;
}

GLvoid KillFont(GLvoid)									// Delete The Font List
{
	glDeleteLists(base, 96);							// Delete All 96 Characters
}

GLvoid glPrint(unsigned base, const char *fmt, ...)					// Custom GL "Print" Routine
{
	char		text[256];								// Holds Our String
	va_list		ap;										// Pointer To List Of Arguments

	if (fmt == NULL)									// If There''s No Text
		return;											// Do Nothing

	va_start(ap, fmt);									// Parses The String For Variables
	    vsprintf(text, fmt, ap);						// And Converts Symbols To Actual Numbers
	va_end(ap);											// Results Are Stored In Text

	glPushAttrib(GL_LIST_BIT);							// Pushes The Display List Bits
	glListBase(base - 32);								// Sets The Base Character to 32
	glCallLists(strlen(text), GL_UNSIGNED_BYTE, text);	// Draws The Display List Text
	glPopAttrib();										// Pops The Display List Bits
}

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,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
{
	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

	base = BuildFont("courier new");										// Build The Font
	base2 = BuildFont("times new roman");										// Build The Font

	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 Modelview Matrix
	glTranslatef(0.0f,0.0f,-1.0f);						// Move One Unit Into The Screen
	// Pulsing Colors Based On Text Position
	glColor3f(1.0f*float(cos(cnt1)),1.0f*float(sin(cnt2)),1.0f-0.5f*float(cos(cnt1+cnt2)));
	// Position The Text On The Screen
	glRasterPos2f(-0.45f+0.05f*float(cos(cnt1)), 0.32f*float(sin(cnt2)));
	unsigned base = ::base;
	static count = 0;
	if (((++count)/100)&1)
		base = ::base2;
 	glPrint(base, "Active OpenGL Text With NeHe - %7.2f", cnt1);	// Print GL Text To The Screen
	cnt1+=0.051f;										// Increase The First Counter
	cnt2+=0.005f;										// Increase The First Counter
	return TRUE;										// Everything Went OK
}

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
	}

	KillFont();
}

/*	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


	// 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("NeHe''s Bitmap Font 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("NeHe''s Bitmap Font Tutorial",640,480,16,fullscreen))
				{
					return 0;						// Quit If Window Was Not Created

				}
			}
		}
	}

	// Shutdown

	KillGLWindow();									// Kill The Window

	return (msg.wParam);							// Exit The Program

}