typedef struct							float	r,g,b;					// Particle's Colors	float	x,y,z;					// Particle's Position	float	xi,yi,zi;				// Particle's Movement}particle;							// Particles Structuretypedef struct						// Create A Structure For Firework{	float x,y;						// Firework's Position	float xi,yi;					// Firework's Movement	particle body[BODY_PARTICLES];	// Body of Firework	particle tail[TAIL_PARTICLES];	// Tail of Firework	int starttime;					// Time the firework was set	int duration;					// How long it will last	int style;						// Picture it should create}Firework;Firework Fireworks[10];void SetupFirework(int i)								// Setup the new firework variables{	int clr;	float rnum;	clr=rand()%3;		Fireworks.starttime=ElapsedTime;	Fireworks.duration=rand()%1000+3000;	Fireworks.x=1.0f*(rand()%20-10);	Fireworks.y=-20.0f;	Fireworks.xi =(rand()*2-1)/80.0f;	Fireworks.yi =(rand()+1.5f)/80.0f;	Fireworks.style =rand()%10;	for (loop=0;loop<BODY_PARTICLES;loop++)						// Initials All The Textures	{				if (Fireworks.style < 2) 		{			rnum = (rand()/6.0f +0.4f)/10.0f*EXPLOSION_SIZE;		}		else		{			rnum = (rand()/10.0f -0.05f)*EXPLOSION_SIZE;		}		Fireworks.body[loop].xi =rnum* cos(loop/10.0f);		Fireworks.body[loop].yi =rnum* sin(loop/10.0f);		Fireworks.body[loop].zi =rnum* cos(loop/4.0f);		Fireworks.body[loop].x =Fireworks.body[loop].xi;		Fireworks.body[loop].y =Fireworks.body[loop].yi;		Fireworks.body[loop].z =Fireworks.body[loop].zi;		if (clr == 0)  Fireworks.body[loop].r =rand()/3.0f + 0.7f; else Fireworks.body[loop].r =rand()/3.0f + 0.4f;		if (clr == 1)  Fireworks.body[loop].g =rand()/3.0f + 0.7f; else Fireworks.body[loop].g =rand()/3.0f + 0.4f;		if (clr == 2)  Fireworks.body[loop].b =rand()/3.0f + 0.7f; else Fireworks.body[loop].b =rand()/3.0f + 0.4f;			}	for (loop=0;loop<TAIL_PARTICLES;loop++)	{		Fireworks.tail[loop].x=0.0f;		Fireworks.tail[loop].y=0.0f;		Fireworks.tail[loop].z= 50.0f + rand()%50;             // will act as duration for particle		Fireworks.tail[loop].xi=-0.7f*Fireworks.xi;		Fireworks.tail[loop].yi=-rand()/20-0.001f;		if (clr == 0)  Fireworks.tail[loop].r =rand()/3.0f + 0.8f; else Fireworks.tail[loop].r =rand()/3.0f + 0.4f;		if (clr == 1)  Fireworks.tail[loop].g =rand()/3.0f + 0.8f; else Fireworks.tail[loop].g =rand()/3.0f + 0.4f;		if (clr == 2)  Fireworks.tail[loop].b =rand()/3.0f + 0.8f; else Fireworks.tail[loop].b =rand()/3.0f + 0.4f;			}}void FireworkTail(int i){	int j;	glTranslatef(Fireworks.x, Fireworks.y, 0);  // the main part of the rocket	glColor3f(1.0f, 1.0f, 1.0f);    	glBegin(GL_QUADS);		glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 0.0f);		glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 0.0f);		glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, 0.0f);		glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, 0.0f);	glEnd();  // the tail of the rocket	glBegin(GL_QUADS);    for (j=0;j<TAIL_PARTICLES;j++)	{	  glColor4f(Fireworks.tail[j].r, Fireworks.tail[j].g, Fireworks.tail[j].b, Fireworks.tail[j].z/100.0f);    // here Z is used as the alpha value      glTexCoord2f(0.0f, 0.0f); glVertex3f(Fireworks.tail[j].x-1.0f, Fireworks.tail[j].y-1.0f, 0.0f);      glTexCoord2f(1.0f, 0.0f); glVertex3f(Fireworks.tail[j].x+1.0f, Fireworks.tail[j].y-1.0f, 0.0f);      glTexCoord2f(1.0f, 1.0f); glVertex3f(Fireworks.tail[j].x+1.0f, Fireworks.tail[j].y+1.0f, 0.0f);      glTexCoord2f(0.0f, 1.0f); glVertex3f(Fireworks.tail[j].x-1.0f, Fireworks.tail[j].y+1.0f, 0.0f);      Fireworks.tail[j].x =Fireworks.tail[j].x+Fireworks.tail[j].xi;      Fireworks.tail[j].y =Fireworks.tail[j].y+Fireworks.tail[j].yi;      Fireworks.tail[j].z =Fireworks.tail[j].z-1;      if (Fireworks.tail[j].z == 0.0f) 	  {        Fireworks.tail[j].x = 0.0f;		Fireworks.tail[j].y = 0.0f;        Fireworks.tail[j].z =50.0f + rand()%50;	  }    }	glEnd();}void FireworkExplode(int i){	int j;    float slowdown;	glTranslatef(Fireworks.x, Fireworks.y, 0.0f);	glBegin(GL_QUADS);    	for (j=0;j<BODY_PARTICLES;j++)	{			glColor4f(Fireworks.body[j].r, Fireworks.body[j].g, Fireworks.body[j].b, 1.8f-(ElapsedTime-Fireworks.starttime-1000)/1200.0f);        glTexCoord2f(0.0f, 0.0f); glVertex3f(Fireworks.body[j].x-1.0f, Fireworks.body[j].y-1.0f, Fireworks.body[j].z);        glTexCoord2f(1.0f, 0.0f); glVertex3f(Fireworks.body[j].x+1.0f, Fireworks.body[j].y-1.0f, Fireworks.body[j].z);        glTexCoord2f(1.0f, 1.0f); glVertex3f(Fireworks.body[j].x+1.0f, Fireworks.body[j].y+1.0f, Fireworks.body[j].z);        glTexCoord2f(0.0f, 1.0f); glVertex3f(Fireworks.body[j].x-1.0f, Fireworks.body[j].y+1.0f, Fireworks.body[j].z);        // Calculate the new coords based on the change, dX, in a direction        // and slow the change down as time goes by.        slowdown =((ElapsedTime-Fireworks.starttime-1000) - pow((float)(1000+Fireworks.starttime-ElapsedTime),2)/5000.0f)/6.0f;        Fireworks.body[j].x =Fireworks.body[j].xi * slowdown;        Fireworks.body[j].y =Fireworks.body[j].yi * slowdown;        Fireworks.body[j].z =Fireworks.body[j].zi * slowdown;	}  glEnd();	}void glDraw(){	int i;    float slowdown;	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    // Clear The Screen And The Depth Buffer	glLoadIdentity();                                       // Reset The View	glTranslatef(0.0,0.0,-50.0f);	for (i=0;i<= nFireworks-1;i++) 	{		glPushMatrix();		// Display the firework		if (ElapsedTime-Fireworks.starttime < 1000) 		{						FireworkTail(i);		}		else		{			FireworkExplode(i);		}      // create a new firework      if (ElapsedTime - Fireworks.starttime - Fireworks.duration >=0) 	  {		 		  SetupFirework(i);				  }      // keep moving and slowing down firework      slowdown =pow((float)(Fireworks.starttime-ElapsedTime),2);      Fireworks.x =Fireworks.xi * ((ElapsedTime-Fireworks.starttime) - slowdown/7000.0f);      Fireworks.y =Fireworks.yi * ((ElapsedTime-Fireworks.starttime) - slowdown/4500.0f) - 20.0f;    glPopMatrix();	}}int InitGL(GLvoid)										// All Setup For OpenGL Goes Here{	int i;	if (!LoadGLTextures())								// Jump To Texture Loading Routine	{		return FALSE;									// If Texture Didn't Load Return FALSE	}	glShadeModel(GL_SMOOTH);							// Enable Smooth Shading	glClearColor(0.0f,0.0f,0.0f,0.0f);					// Black Background	glClearDepth(1.0f);									// Depth Buffer Setup	glDisable(GL_DEPTH_TEST);							// Disable Depth Testing	glEnable(GL_BLEND);									// Enable Blending	glBlendFunc(GL_SRC_ALPHA,GL_ONE);					// Type Of Blending To Perform	glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);	// Really Nice Perspective Calculations	glHint(GL_POINT_SMOOTH_HINT,GL_NICEST);				// Really Nice Point Smoothing	glEnable(GL_TEXTURE_2D);							// Enable Texture Mapping	glBindTexture(GL_TEXTURE_2D,texture[0]);			// Select Our Texture		nFireworks=3;	for (i=0;i<=nFireworks-1;i++)	{				SetupFirework(i);		Fireworks.starttime=-1000*i;	}	return TRUE;										// Initialization Went OK}

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	DWORD   DemoStart, LastTime;	DemoStart = GetTickCount();					// Get Time when demo started	// 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("Da Great Firework Show",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		{							LastTime =ElapsedTime;			ElapsedTime =GetTickCount() - DemoStart;     // Calculate Elapsed Time			ElapsedTime =(LastTime + ElapsedTime) / 2; // Average it out for smoother movement			glDraw();                           // Draw the scene			SwapBuffers(hDC);                  // Display the scene			// Draw The Scene.  Watch For ESC Key And Quit Messages From DrawGLScene()			if (keys[VK_ESCAPE])	// Active?  Was There A Quit Received?			{				done=TRUE;							// ESC or DrawGLScene Signalled A Quit			}			else									// Not Time To Quit, Update Screen			{																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("Da Great Firework Show",640,480,32,fullscreen))					{						return 0;						// Quit If Window Was Not Created					}				}			}		}	}	// Shutdown	KillGLWindow();									// Kill The Window	return (msg.wParam);							// Exit The Program}