glPushMatrix();glRotatef(......); // rotate/move/scale the particle here... rendering of individual particle ...glPopMatrix();

#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#define	MAX_PARTICLES	1000		// Number Of Particles To CreateHDC			hDC=NULL;				// Private GDI Device ContextHGLRC		hRC=NULL;				// Permanent Rendering 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 Defaultbool	rainbow=true;				// Rainbow Mode?bool	sp;							// Spacebar Pressed?bool	rp;							// Enter Key Pressed?bool    standard=true;bool    fire=false;bool    snow=false;bool    threeD=false;float	slowdown=2.0f;				// Slow Down Particlesfloat	xspeed;						// Base X Speed (To Allow Keyboard Direction Of Tail)float	yspeed;						// Base Y Speed (To Allow Keyboard Direction Of Tail)float	zspeed;						// Base Z Speed (To Allow Keyboard Direction Of Tail)float	zoom=-40.0f;				// Used To Zoom OutGLuint	loop;						// Misc Loop VariableGLuint	col;						// Current Color SelectionGLuint	delay;						// Rainbow Effect DelayGLuint	texture[1];					// Storage For Our Particle Texturetypedef struct						// Create A Structure For Particle{	bool	active;					// Active (Yes/No)	float	life;					// Particle Life	float	fade;					// Fade Speed	float	r;						// Red Value	float	g;						// Green Value	float	b;						// Blue Value	float	x;						// X Position	float	y;						// Y Position	float	z;						// Z Position	float	xi;						// X Direction	float	yi;						// Y Direction	float	zi;						// Z Direction	float	xg;						// X Gravity	float	yg;						// Y Gravity	float	zg;						// Z Gravity}particles;							// Particles Structureparticles particle[MAX_PARTICLES];	// Particle Array (Room For Particle Info)static GLfloat colors[12][3]=		// Rainbow Of Colors{	{1.0f,0.5f,0.5f},{1.0f,0.75f,0.5f},{1.0f,1.0f,0.5f},{0.75f,1.0f,0.5f},	{0.5f,1.0f,0.5f},{0.5f,1.0f,0.75f},{0.5f,1.0f,1.0f},{0.5f,0.75f,1.0f},	{0.5f,0.5f,1.0f},{0.75f,0.5f,1.0f},{1.0f,0.5f,1.0f},{1.0f,0.5f,0.75f}};LRESULT	CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);	// Declaration For WndProcAUX_RGBImageRec *LoadBMP(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}int LoadGLTextures()									// Load Bitmap And Convert To A Texture{        int Status=FALSE;								// Status Indicator        AUX_RGBImageRec *TextureImage[1];				// Create Storage Space For The Textures        memset(TextureImage,0,sizeof(void *)*1);		// Set The Pointer To NULL			if (TextureImage[0]=LoadBMP("Data/particle.bmp"))	// Load Particle Texture		{			Status=TRUE;								// Set The Status To TRUE			glGenTextures(1, &texture[0]);				// Create One Texture			glBindTexture(GL_TEXTURE_2D, texture[0]);			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);			glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);		}		        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 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,200.0f);	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	{		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	for (loop=0;loop<MAX_PARTICLES;loop++)				// Initials All The Textures	{		particle[loop].active=true;								// Make All The Particles Active		particle[loop].life=1.0f;								// Give All The Particles Full Life		particle[loop].fade=float(rand()%100)/1000.0f+0.003f;	// Random Fade Speed		particle[loop].r=colors[loop*(12/MAX_PARTICLES)][0];	// Select Red Rainbow Color		particle[loop].g=colors[loop*(12/MAX_PARTICLES)][1];	// Select Red Rainbow Color		particle[loop].b=colors[loop*(12/MAX_PARTICLES)][2];	// Select Red Rainbow Color		particle[loop].xi=float((rand()%50)-26.0f)*10.0f;		// Random Speed On X Axis		particle[loop].yi=float((rand()%50)-25.0f)*10.0f;		// Random Speed On Y Axis		particle[loop].zi=float((rand()%50)-25.0f)*10.0f;		// Random Speed On Z Axis		particle[loop].xg=0.0f;									// Set Horizontal Pull To Zero		particle[loop].yg=-0.8f;								// Set Vertical Pull Downward		particle[loop].zg=0.0f;									// Set Pull On Z Axis To Zero	}	return TRUE;										// Initialization Went OK}int DrawGLScene(GLvoid)										// Here's Where We Do All The Drawing{	if(standard)	{		int Status=FALSE;								// Status Indicator        AUX_RGBImageRec *TextureImage[1];				// Create Storage Space For The Textures        memset(TextureImage,0,sizeof(void *)*1);		// Set The Pointer To NULL			if (TextureImage[0]=LoadBMP("Data/particle.bmp"))	// Load Particle Texture		{			Status=TRUE;								// Set The Status To TRUE			glGenTextures(1, &texture[0]);				// Create One Texture			glBindTexture(GL_TEXTURE_2D, texture[0]);			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);			glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);		}		        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		}		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		// Clear Screen And Depth Buffer		glLoadIdentity();										// Reset The ModelView Matrix		for (loop=0;loop<MAX_PARTICLES;loop++)					// Loop Through All The Particles		{			if (particle[loop].active)							// If The Particle Is Active			{				float x=particle[loop].x;						// Grab Our Particle X Position				float y=particle[loop].y;						// Grab Our Particle Y Position				float z=particle[loop].z+zoom;					// Particle Z Pos + Zoom				// Draw The Particle Using Our RGB Values, Fade The Particle Based On It's Life				glColor4f(particle[loop].r,particle[loop].g,particle[loop].b,particle[loop].life);				glBegin(GL_TRIANGLE_STRIP);						// Build Quad From A Triangle Strip					glTexCoord2d(1,1); glVertex3f(x+0.5f,y+0.5f,z); // Top Right					glTexCoord2d(0,1); glVertex3f(x-0.5f,y+0.5f,z); // Top Left					glTexCoord2d(1,0); glVertex3f(x+0.5f,y-0.5f,z); // Bottom Right					glTexCoord2d(0,0); glVertex3f(x-0.5f,y-0.5f,z); // Bottom Left				glEnd();										// Done Building Triangle Strip				particle[loop].x+=particle[loop].xi/(slowdown*1000);// Move On The X Axis By X Speed				particle[loop].y+=particle[loop].yi/(slowdown*1000);// Move On The Y Axis By Y Speed				particle[loop].z+=particle[loop].zi/(slowdown*1000);// Move On The Z Axis By Z Speed				particle[loop].xi+=particle[loop].xg;			// Take Pull On X Axis Into Account				particle[loop].yi+=particle[loop].yg;			// Take Pull On Y Axis Into Account				particle[loop].zi+=particle[loop].zg;			// Take Pull On Z Axis Into Account				particle[loop].life-=particle[loop].fade;		// Reduce Particles Life By 'Fade'				if (particle[loop].life<0.0f)					// If Particle Is Burned Out				{					particle[loop].life=1.0f;					// Give It New Life					particle[loop].fade=float(rand()%100)/1000.0f+0.003f;	// Random Fade Value					particle[loop].x=0.0f;						// Center On X Axis					particle[loop].y=0.0f;						// Center On Y Axis					particle[loop].z=0.0f;						// Center On Z Axis					particle[loop].xi=xspeed+float((rand()%60)-32.0f);	// X Axis Speed And Direction					particle[loop].yi=yspeed+float((rand()%60)-30.0f);	// Y Axis Speed And Direction					particle[loop].zi=float((rand()%60)-30.0f);	// Z Axis Speed And Direction					particle[loop].r=colors[col][0];			// Select Red From Color Table					particle[loop].g=colors[col][1];			// Select Green From Color Table					particle[loop].b=colors[col][2];			// Select Blue From Color Table				}				// If Number Pad 8 And Y Gravity Is Less Than 1.5 Increase Pull Upwards				if (keys[VK_NUMPAD8] && (particle[loop].yg<1.5f)) particle[loop].yg+=0.01f;				// If Number Pad 2 And Y Gravity Is Greater Than -1.5 Increase Pull Downwards				if (keys[VK_NUMPAD2] && (particle[loop].yg>-1.5f)) particle[loop].yg-=0.01f;				// If Number Pad 6 And X Gravity Is Less Than 1.5 Increase Pull Right				if (keys[VK_NUMPAD6] && (particle[loop].xg<1.5f)) particle[loop].xg+=0.01f;				// If Number Pad 4 And X Gravity Is Greater Than -1.5 Increase Pull Left				if (keys[VK_NUMPAD4] && (particle[loop].xg>-1.5f)) particle[loop].xg-=0.01f;				if (keys[VK_TAB])										// Tab Key Causes A Burst				{					particle[loop].x=0.0f;								// Center On X Axis					particle[loop].y=0.0f;								// Center On Y Axis					particle[loop].z=0.0f;								// Center On Z Axis					particle[loop].xi=float((rand()%50)-26.0f)*10.0f;	// Random Speed On X Axis					particle[loop].yi=float((rand()%50)-25.0f)*10.0f;	// Random Speed On Y Axis					particle[loop].zi=float((rand()%50)-25.0f)*10.0f;	// Random Speed On Z Axis				}			}		}	}	if(fire)	{		int Status=FALSE;								// Status Indicator        AUX_RGBImageRec *TextureImage[1];				// Create Storage Space For The Textures        memset(TextureImage,0,sizeof(void *)*1);		// Set The Pointer To NULL			if (TextureImage[0]=LoadBMP("Data/fire.bmp"))	// Load Particle Texture		{			Status=TRUE;								// Set The Status To TRUE			glGenTextures(1, &texture[0]);				// Create One Texture			glBindTexture(GL_TEXTURE_2D, texture[0]);			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);			glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);		}		        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		}		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		// Clear Screen And Depth Buffer		glLoadIdentity();										// Reset The ModelView Matrix		for (loop=0;loop<MAX_PARTICLES;loop++)					// Loop Through All The Particles		{			if (particle[loop].active)							// If The Particle Is Active			{				float x=particle[loop].x;						// Grab Our Particle X Position				float y=particle[loop].y;						// Grab Our Particle Y Position				float z=particle[loop].z+zoom;					// Particle Z Pos + Zoom				// Draw The Particle Using Our RGB Values, Fade The Particle Based On It's Life				glColor4f(particle[loop].r,particle[loop].g,particle[loop].b,particle[loop].life);				glBegin(GL_TRIANGLE_STRIP);						// Build Quad From A Triangle Strip					glTexCoord2d(1,1); glVertex3f(x+0.5f,y+0.5f,z); // Top Right					glTexCoord2d(0,1); glVertex3f(x-0.5f,y+0.5f,z); // Top Left					glTexCoord2d(1,0); glVertex3f(x+0.5f,y-0.5f,z); // Bottom Right					glTexCoord2d(0,0); glVertex3f(x-0.5f,y-0.5f,z); // Bottom Left				glEnd();										// Done Building Triangle Strip				particle[loop].x+=rand()%2*particle[loop].xi/(slowdown*1000);// Move On The X Axis By X Speed				particle[loop].y+=rand()%2*particle[loop].yi/(slowdown*1000);// Move On The Y Axis By Y Speed				particle[loop].z+=particle[loop].zi/(slowdown*1000);// Move On The Z Axis By Z Speed				particle[loop].xi+=particle[loop].xg;			// Take Pull On X Axis Into Account				particle[loop].yi+=particle[loop].yg;			// Take Pull On Y Axis Into Account				particle[loop].zi+=particle[loop].zg;			// Take Pull On Z Axis Into Account				particle[loop].life-=particle[loop].fade;		// Reduce Particles Life By 'Fade'				if (particle[loop].life<0.0f)					// If Particle Is Burned Out				{					particle[loop].life=1.0f;					// Give It New Life					particle[loop].fade=float(rand()%100)/1000.0f+0.008f;	// Random Fade Value					particle[loop].x=0.0f;						// Center On X Axis					particle[loop].y=0.0f;						// Center On Y Axis					particle[loop].z=0.0f;						// Center On Z Axis					particle[loop].xi=xspeed+float((rand()%60)-32.0f);	// X Axis Speed And Direction					particle[loop].yi=yspeed+float((rand()%60)-30.0f);	// Y Axis Speed And Direction					particle[loop].zi=float((rand()%60)-30.0f);	// Z Axis Speed And Direction					particle[loop].r=colors[col][0];			// Select Red From Color Table					particle[loop].g=colors[col][1];			// Select Green From Color Table					particle[loop].b=colors[col][2];			// Select Blue From Color Table				}				// If Number Pad 8 And Y Gravity Is Less Than 1.5 Increase Pull Upwards				if (keys[VK_NUMPAD8] && (particle[loop].yg<1.5f)) particle[loop].yg+=0.01f;				// If Number Pad 2 And Y Gravity Is Greater Than -1.5 Increase Pull Downwards				if (keys[VK_NUMPAD2] && (particle[loop].yg>-1.5f)) particle[loop].yg-=0.01f;				// If Number Pad 6 And X Gravity Is Less Than 1.5 Increase Pull Right				if (keys[VK_NUMPAD6] && (particle[loop].xg<1.5f)) particle[loop].xg+=0.01f;				// If Number Pad 4 And X Gravity Is Greater Than -1.5 Increase Pull Left				if (keys[VK_NUMPAD4] && (particle[loop].xg>-1.5f)) particle[loop].xg-=0.01f;			}		}	}	if(snow)	{		int Status=FALSE;								// Status Indicator        AUX_RGBImageRec *TextureImage[1];				// Create Storage Space For The Textures        memset(TextureImage,0,sizeof(void *)*1);		// Set The Pointer To NULL			if (TextureImage[0]=LoadBMP("Data/snow.bmp"))	// Load Particle Texture		{			Status=TRUE;								// Set The Status To TRUE			glGenTextures(1, &texture[0]);				// Create One Texture			glBindTexture(GL_TEXTURE_2D, texture[0]);			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);			glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);			glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);		}		        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		}		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		// Clear Screen And Depth Buffer		glLoadIdentity();										// Reset The ModelView Matrix		for (loop=0;loop<MAX_PARTICLES;loop++)					// Loop Through All The Particles		{			if (particle[loop].active)							// If The Particle Is Active			{				float x=particle[loop].x;						// Grab Our Particle X Position				float y=particle[loop].y;						// Grab Our Particle Y Position				float z=particle[loop].z+zoom;					// Particle Z Pos + Zoom				// Draw The Particle Using Our RGB Values, Fade The Particle Based On It's Life				glColor4f(particle[loop].r,particle[loop].g,particle[loop].b,particle[loop].life);				glBegin(GL_TRIANGLE_STRIP);						// Build Quad From A Triangle Strip					glTexCoord2d(1,1); glVertex3f(x+0.5f,y+0.5f,z); // Top Right					glTexCoord2d(0,1); glVertex3f(x-0.5f,y+0.5f,z); // Top Left					glTexCoord2d(1,0); glVertex3f(x+0.5f,y-0.5f,z); // Bottom Right					glTexCoord2d(0,0); glVertex3f(x-0.5f,y-0.5f,z); // Bottom Left				glEnd();										// Done Building Triangle Strip				particle[loop].x+=rand()%3*particle[loop].xi/(slowdown*1000);// Move On The X Axis By X Speed				particle[loop].y+=particle[loop].yi/(slowdown*1000);// Move On The Y Axis By Y Speed				particle[loop].z+=particle[loop].zi/(slowdown*1000);// Move On The Z Axis By Z Speed				particle[loop].xi+=particle[loop].xg;			// Take Pull On X Axis Into Account				particle[loop].yi+=particle[loop].yg;			// Take Pull On Y Axis Into Account				particle[loop].zi+=particle[loop].zg;			// Take Pull On Z Axis Into Account				particle[loop].life-=particle[loop].fade;		// Reduce Particles Life By 'Fade'				if (particle[loop].life<0.0f)					// If Particle Is Burned Out				{					particle[loop].life=1.0f;					// Give It New Life					particle[loop].fade=float(rand()%100)/1000.0f+0.001f;	// Random Fade Value					particle[loop].x=float(rand()%60-30);						// Center On X Axis					particle[loop].y=20.0f;						// Center On Y Axis					particle[loop].z=0.0f;						// Center On Z Axis					particle[loop].xi=float((rand()%60)-32.0f);	// X Axis Speed And Direction					particle[loop].yi=float((rand()%60)-30.0f);	// Y Axis Speed And Direction					particle[loop].zi=float((rand()%60)-30.0f);	// Z Axis Speed And Direction					particle[loop].xg=0.0;						particle[loop].yg=-0.8;						particle[loop].zg=0.0;					particle[loop].r=1;			// Select Red From Color Table					particle[loop].g=1;			// Select Green From Color Table					particle[loop].b=1;			// Select Blue From Color Table				}			}		}	}	if(threeD)	{		int Status=FALSE;								// Status Indicator			AUX_RGBImageRec *TextureImage[1];				// Create Storage Space For The Textures			memset(TextureImage,0,sizeof(void *)*1);		// Set The Pointer To NULL					if (TextureImage[0]=LoadBMP("Data/blank.bmp"))	// Load Particle Texture			{				Status=TRUE;								// Set The Status To TRUE				glGenTextures(1, &texture[0]);				// Create One Texture				glBindTexture(GL_TEXTURE_2D, texture[0]);				glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);				glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);				glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);			}						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			}			glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		// Clear Screen And Depth Buffer			glLoadIdentity();										// Reset The ModelView Matrix				for (loop=0;loop<MAX_PARTICLES;loop++)					// Loop Through All The Particles			{				if (particle[loop].active)							// If The Particle Is Active				{					float x=particle[loop].x;						// Grab Our Particle X Position					float y=particle[loop].y;						// Grab Our Particle Y Position					float z=particle[loop].z+zoom;					// Particle Z Pos + Zoom					// Draw The Particle Using Our RGB Values, Fade The Particle Based On It's Life					glColor4f(particle[loop].r,particle[loop].g,particle[loop].b,particle[loop].life);										glPushMatrix();					glRotatef(0.3f,1.0f,0.0f,0.0f);						// Rotate On The X Axis					glRotatef(0.2f,0.0f,1.0f,0.0f);						// Rotate On The Y Axis					glRotatef(0.4f,0.0f,0.0f,1.0f);						// Rotate On The Z Axis										glBegin(GL_QUADS);									// Draw A Quad						// Front Face						glTexCoord2f(0.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z+0.5f);	// Bottom Left Of The Texture and Quad						glTexCoord2f(1.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z+0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z+0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z+0.5f);	// Top Left Of The Texture and Quad						// Back Face						glTexCoord2f(1.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z-0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z-0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z-0.5f);	// Top Left Of The Texture and Quad						glTexCoord2f(0.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z-0.5f);	// Bottom Left Of The Texture and Quad						// Top Face						glTexCoord2f(0.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z-0.5f);	// Top Left Of The Texture and Quad						glTexCoord2f(0.0f, 0.0f); glVertex3f(x-0.5f, y+0.5f, z+0.5f);	// Bottom Left Of The Texture and Quad						glTexCoord2f(1.0f, 0.0f); glVertex3f(x+0.5f, y+0.5f, z+0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z-0.5f);	// Top Right Of The Texture and Quad						// Bottom Face						glTexCoord2f(1.0f, 1.0f); glVertex3f(x-0.5f, y-0.5f, z-0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x+0.5f, y-0.5f, z-0.5f);	// Top Left Of The Texture and Quad						glTexCoord2f(0.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z+0.5f);	// Bottom Left Of The Texture and Quad						glTexCoord2f(1.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z+0.5f);	// Bottom Right Of The Texture and Quad						// Right face						glTexCoord2f(1.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z-0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z-0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z+0.5f);	// Top Left Of The Texture and Quad						glTexCoord2f(0.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z+0.5f);	// Bottom Left Of The Texture and Quad						// Left Face						glTexCoord2f(0.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z-0.5f);	// Bottom Left Of The Texture and Quad						glTexCoord2f(1.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z+0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z+0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z-0.5f);	// Top Left Of The Texture and Quad					glEnd();											// Done Drawing The Quad					glPopMatrix();					particle[loop].x+=particle[loop].xi/(slowdown*1000);// Move On The X Axis By X Speed					particle[loop].y+=particle[loop].yi/(slowdown*1000);// Move On The Y Axis By Y Speed					particle[loop].z+=particle[loop].zi/(slowdown*1000);// Move On The Z Axis By Z Speed					particle[loop].xi+=particle[loop].xg;			// Take Pull On X Axis Into Account					particle[loop].yi+=particle[loop].yg;			// Take Pull On Y Axis Into Account					particle[loop].zi+=particle[loop].zg;			// Take Pull On Z Axis Into Account					particle[loop].life-=particle[loop].fade;		// Reduce Particles Life By 'Fade'					if (particle[loop].life<0.0f)					// If Particle Is Burned Out					{						particle[loop].life=1.0f;					// Give It New Life						particle[loop].fade=float(rand()%100)/1000.0f+0.003f;	// Random Fade Value						particle[loop].x=0.0f;						// Center On X Axis						particle[loop].y=0.0f;						// Center On Y Axis						particle[loop].z=0.0f;						// Center On Z Axis						particle[loop].xi=xspeed+float((rand()%60)-32.0f);	// X Axis Speed And Direction						particle[loop].yi=yspeed+float((rand()%60)-30.0f);	// Y Axis Speed And Direction						particle[loop].zi=zspeed+float((rand()%60)-30.0f);	// Z Axis Speed And Direction						particle[loop].r=colors[col][0];			// Select Red From Color Table						particle[loop].g=colors[col][1];			// Select Green From Color Table						particle[loop].b=colors[col][2];			// Select Blue From Color Table					}					// If Number Pad 8 And Y Gravity Is Less Than 1.5 Increase Pull Upwards					if (keys[VK_NUMPAD8] && (particle[loop].yg<1.5f)) particle[loop].yg+=0.01f;					// If Number Pad 2 And Y Gravity Is Greater Than -1.5 Increase Pull Downwards					if (keys[VK_NUMPAD2] && (particle[loop].yg>-1.5f)) particle[loop].yg-=0.01f;					// If Number Pad 6 And X Gravity Is Less Than 1.5 Increase Pull Right					if (keys[VK_NUMPAD6] && (particle[loop].xg<1.5f)) particle[loop].xg+=0.01f;					// If Number Pad 4 And X Gravity Is Greater Than -1.5 Increase Pull Left					if (keys[VK_NUMPAD4] && (particle[loop].xg>-1.5f)) particle[loop].xg-=0.01f;					// If Number Pad 8 And Number Pad 2 And Z Gravity Is Less Than 1.5 Increase Pull Outwards					if (keys[VK_NUMPAD4] && keys[VK_NUMPAD6] && (particle[loop].zg<1.5f)) particle[loop].zg+=0.01f;					// If Number Pad 4 And Number Pad 6 And Z Gravity Is Greater Than -1.5 Increase Pull Inwards					if (keys[VK_NUMPAD8] && keys[VK_NUMPAD2] && (particle[loop].zg>-1.5f)) particle[loop].zg-=0.01f;					if (keys[VK_TAB])										// Tab Key Causes A Burst					{						particle[loop].x=0.0f;								// Center On X Axis						particle[loop].y=0.0f;								// Center On Y Axis						particle[loop].z=0.0f;								// Center On Z Axis						particle[loop].xi=float((rand()%50)-26.0f)*10.0f;	// Random Speed On X Axis						particle[loop].yi=float((rand()%50)-25.0f)*10.0f;	// Random Speed On Y Axis						particle[loop].zi=float((rand()%50)-25.0f)*10.0f;	// Random Speed On Z Axis					}				}			}		}	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	}}/*	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									// Otherwise			{				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 Particle Tutorial",640,480,16,fullscreen))	{		return 0;									// Quit If Window Was Not Created	}	if (fullscreen)									// Are We In Fullscreen Mode	{		slowdown=1.0f;								// If So, Speed Up The Particles (3dfx Issue)	}	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_ADD] && (slowdown>1.0f)) slowdown-=0.01f;		// Speed Up Particles				if (keys[VK_SUBTRACT] && (slowdown<4.0f)) slowdown+=0.01f;	// Slow Down Particles				if (keys[VK_PRIOR])	zoom+=0.1f;		// Zoom In				if (keys[VK_NEXT])	zoom-=0.1f;		// Zoom Out				if (keys[VK_RETURN] && !rp)			// Return Key Pressed				{					rp=true;						// Set Flag Telling Us It's Pressed					rainbow=!rainbow;				// Toggle Rainbow Mode On / Off				}				if (!keys[VK_RETURN]) rp=false;		// If Return Is Released Clear Flag								if ((keys[' '] && !sp) || (rainbow && (delay>25)))	// Space Or Rainbow Mode				{					if (keys[' '])	rainbow=false;	// If Spacebar Is Pressed Disable Rainbow Mode					sp=true;						// Set Flag Telling Us Space Is Pressed					delay=0;						// Reset The Rainbow Color Cycling Delay					col++;							// Change The Particle Color					if (col>11)	col=0;				// If Color Is To High Reset It				}				if (!keys[' '])	sp=false;			// If Spacebar Is Released Clear Flag				if(!snow)				{					// If Up Arrow And Y Speed Is Less Than 200 Increase Upward Speed					if (keys[VK_UP] && (yspeed<200)) yspeed+=1.0f;					// If Down Arrow And Y Speed Is Greater Than -200 Increase Downward Speed					if (keys[VK_DOWN] && (yspeed>-200)) yspeed-=1.0f;					// If Right Arrow And X Speed Is Less Than 200 Increase Speed To The Right					if (keys[VK_RIGHT] && (xspeed<200)) xspeed+=1.0f;					// If Left Arrow And X Speed Is Greater Than -200 Increase Speed To The Left					if (keys[VK_LEFT] && (xspeed>-200)) xspeed-=1.0f;					if(threeD)					{						// If Up and Down Arrow And Z Speed Is Greater Than 200 Increase Inward Speed						if (keys[VK_UP] && keys[VK_DOWN] && (zspeed>-200)) zspeed-=1.0f;						// If Right and Left Arrow And Z Speed Is Less Than 200 Increase Outward Speed						if (keys[VK_RIGHT] && keys[VK_LEFT] && (zspeed<200)) zspeed+=1.0f;					}				}				delay++;							// Increase Rainbow Mode Color Cycling Delay Counter				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 Particle Tutorial",640,480,16,fullscreen))					{						return 0;						// Quit If Window Was Not Created					}				}					if (keys[VK_F2])						// Is F2 Being Pressed?				{					standard=true;					fire=false;					snow=false;					threeD=false;				}				if (keys[VK_F3])						// Is F3 Being Pressed?				{					standard=false;					fire=true;					snow=false;					threeD=false;				}				if (keys[VK_F4])						// Is F4 Being Pressed?				{					standard=false;					fire=false;					snow=true;					threeD=false;				}				if (keys[VK_F5])						// Is F5 Being Pressed?				{					standard=false;					fire=false;					snow=false;					threeD=true;				}			}		}	}	// Shutdown	KillGLWindow();									// Kill The Window	return (msg.wParam);							// Exit The Program}

glPushMatrix();glRotatef(particle.xRotAngle,1.0f,0.0f,0.0f);						// Rotate On The X AxisglRotatef(particle.yRotAngle,0.0f,1.0f,0.0f);						// Rotate On The Y AxisglRotatef(particle.zRotAngle,0.0f,0.0f,1.0f);						// Rotate On The Z Axisparticle.xRotAngle += 0.1f;particle.yRotAngle += 0.1f;particle.zRotAngle += 0.1f;/* draw the particle */glPopMatrix();

glPushMatrix();					glRotatef(particle[loop].xrot,1.0f,0.0f,0.0f);						// Rotate On The X Axis					glBegin(GL_QUADS);									// Draw A Quad						// Front Face						glTexCoord2f(0.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z+0.5f);	// Bottom Left Of The Texture and Quad						glTexCoord2f(1.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z+0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z+0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z+0.5f);	// Top Left Of The Texture and Quad						// Back Face						glTexCoord2f(1.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z-0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z-0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z-0.5f);	// Top Left Of The Texture and Quad						glTexCoord2f(0.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z-0.5f);	// Bottom Left Of The Texture and Quad						// Top Face						glTexCoord2f(0.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z-0.5f);	// Top Left Of The Texture and Quad						glTexCoord2f(0.0f, 0.0f); glVertex3f(x-0.5f, y+0.5f, z+0.5f);	// Bottom Left Of The Texture and Quad						glTexCoord2f(1.0f, 0.0f); glVertex3f(x+0.5f, y+0.5f, z+0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z-0.5f);	// Top Right Of The Texture and Quad						// Bottom Face						glTexCoord2f(1.0f, 1.0f); glVertex3f(x-0.5f, y-0.5f, z-0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x+0.5f, y-0.5f, z-0.5f);	// Top Left Of The Texture and Quad						glTexCoord2f(0.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z+0.5f);	// Bottom Left Of The Texture and Quad						glTexCoord2f(1.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z+0.5f);	// Bottom Right Of The Texture and Quad						// Right face						glTexCoord2f(1.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z-0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z-0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x+0.5f, y+0.5f, z+0.5f);	// Top Left Of The Texture and Quad						glTexCoord2f(0.0f, 0.0f); glVertex3f(x+0.5f, y-0.5f, z+0.5f);	// Bottom Left Of The Texture and Quad						// Left Face						glTexCoord2f(0.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z-0.5f);	// Bottom Left Of The Texture and Quad						glTexCoord2f(1.0f, 0.0f); glVertex3f(x-0.5f, y-0.5f, z+0.5f);	// Bottom Right Of The Texture and Quad						glTexCoord2f(1.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z+0.5f);	// Top Right Of The Texture and Quad						glTexCoord2f(0.0f, 1.0f); glVertex3f(x-0.5f, y+0.5f, z-0.5f);	// Top Left Of The Texture and Quad					glEnd();											// Done Drawing The Quad					particle[loop].xrot+=0.3f;					glPopMatrix();

// Push the matrixglPushMatrix();// Translate to where the particle should be drawn in world coordinatesglTranslatef(particle[loop].x, particle[loop].y, particle[loop].z);// RotateglRotatef(particle[loop].xrot, 1.0f, 0.0f, 0.0f);glBegin(GL_QUADS);// There should be no x-0.5f or anything like that here, since it's relative to the translation.glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f, 0.5f);glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f, 0.5f);glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, 0.5f);glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, 0.5f);/* rest of rendering goes here */glEnd();// Pop matrix and increment xrot for next useglPopMatrix();particle[loop].xrot += 0.1f;