void MakeGameOfLife( unsigned int texture ) {

	int i;

	gameOfLife = new GLubyte[ 3 * LIFE_WIDTH * LIFE_HEIGHT ];
	tempLife = new GLubyte[ 3 * LIFE_WIDTH * LIFE_HEIGHT ];

	// empty out game
	for( i=0; i< 3*LIFE_WIDTH*LIFE_HEIGHT; i+=3 ) {
		gameOfLife[i] = tempLife[i] = NULL_RED; // no red
		gameOfLife[i+1] = tempLife[i+1] = NULL_GREEN; // no green
		gameOfLife[i+2] = tempLife[i+2] = NULL_BLUE; // no blue
	}

	// set up initial life
	gameOfLife[ 3*(15*LIFE_WIDTH + 17) ] = LIVE_RED;
	gameOfLife[ 3*(15*LIFE_WIDTH + 16) ] = LIVE_RED;
	gameOfLife[ 3*(16*LIFE_WIDTH + 15) ] = LIVE_RED;
	gameOfLife[ 3*(16*LIFE_WIDTH + 16) ] = LIVE_RED;
	gameOfLife[ 3*(17*LIFE_WIDTH + 16) ] = LIVE_RED;


	// set up texture
	lifeTexture = texture;
	glBindTexture( GL_TEXTURE_2D, lifeTexture );
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
	glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, LIFE_WIDTH, LIFE_HEIGHT,
		0, GL_RGB, GL_UNSIGNED_BYTE, gameOfLife );
}

void PlayGameOfLife() {

	GLubyte *tempPtr;
	int i, j, neighbors, index;

	// set "tempLife" to be next iteration of life
	for( i=0; i<LIFE_HEIGHT; i++ ) {
		index = 3*i*LIFE_WIDTH;
		for( j=0; j<LIFE_WIDTH; j++ ) {
	
			neighbors = 0;

			// row above
			if( i>0 ) {
				if(j>0)
					if( gameOfLife[ index - 3*LIFE_WIDTH - 3 ] != NULL_RED )
						neighbors++;
				if( gameOfLife[ index - 3*LIFE_WIDTH ] != NULL_RED )
					neighbors++;
				if(j<LIFE_WIDTH-1)
					if( gameOfLife[ index - 3*LIFE_WIDTH + 3 ] != NULL_RED ) 
						neighbors++;
			}

			// same row
			if(j>0)
				if( gameOfLife[ index - 3 ] != NULL_RED )
					neighbors++;
			if(j<LIFE_WIDTH-1)
				if( gameOfLife[ index + 3 ] != NULL_RED )
					neighbors++;

			// row below
			if( i<(LIFE_WIDTH-1) ) {
				if(j>0)
					if( gameOfLife[ index + 3*LIFE_WIDTH - 3 ] != NULL_RED )
						neighbors++;
				if( gameOfLife[ index + 3*LIFE_WIDTH ] != NULL_RED )
					neighbors++;
				if(j<LIFE_WIDTH-1)
					if( gameOfLife[ index + 3*LIFE_WIDTH + 3 ] != NULL_RED )
						neighbors++;
			}

			// compute life
			if( gameOfLife[ index ] != NULL_RED ) {
				// living cell
				if( (neighbors<2)||(neighbors>3) ) {
					tempLife[index] = NULL_RED;
					tempLife[index+1] = NULL_GREEN;
					tempLife[index+2] = NULL_BLUE;
				} else {
					tempLife[index] = LIVE_RED;
					tempLife[index+1] = LIVE_GREEN;
					tempLife[index+2] = LIVE_BLUE;
				}
			} else {
				// empty cell
				if( neighbors == 3 ) {
					tempLife[index] = LIVE_RED;
					tempLife[index+1] = LIVE_GREEN;
					tempLife[index+2] = LIVE_BLUE;
				} else {
					tempLife[index] = NULL_RED;
					tempLife[index+1] = NULL_GREEN;
					tempLife[index+2] = NULL_BLUE;
				}

			}

			// advance to next index
			index +=3;
		}
	}

	// swap life buffers
	tempPtr = tempLife;
	tempLife = gameOfLife;
	gameOfLife = tempPtr;

	// reset the texture
	glBindTexture( GL_TEXTURE_2D, lifeTexture );
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
	glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, LIFE_WIDTH, LIFE_HEIGHT,
		0, GL_RGB, GL_UNSIGNED_BYTE, gameOfLife );
}