for ( iSquare = 0; iSquare < SQUARECOUNT - 1; iSquare++ )
	{
		if ( s_sizes[ iSquare ] > 1 )
		{
			{
				addX = s_cosX[ s_iSinX ];
				addY = s_cosY[ s_iSinY ];

				X1 = s_sizeX1[ iSquare ] + addX;
				Y1 = s_sizeY1[ iSquare ] + addY;
				X2 = s_sizeX2[ iSquare ] + addX;
				Y2 = s_sizeY2[ iSquare ] + addY;
			}

			{
				s_iSinX += TUNNEL_CURVEX;
				if ( s_iSinX >= MAXSINCOS )
				{
					s_iSinX -= MAXSINCOS;
				}
				s_iSinY += TUNNEL_CURVEY;
				if ( s_iSinY >= MAXSINCOS )
				{
					s_iSinY -= MAXSINCOS;
				}
			}

			{
				if ( X1 < s_prevX1 )
				{
					X1 = s_prevX1;
				}
				if ( X1 > s_prevX2 )
				{
					X1 = s_prevX2;				
				}
				if ( X2 < s_prevX1 ) 
				{
					X2 = s_prevX1;
				}
				if ( X2 > s_prevX2 ) 
				{
					X2 = s_prevX2;
				}

				if ( Y1 < s_prevY1 )
				{
					Y1 = s_prevY1;
				}
				if ( Y1 > s_prevY2 ) 
				{
					Y1 = s_prevY2;				
				}
				if ( Y2 < s_prevY1 ) 
				{
					Y2 = s_prevY1;
				}
				if ( Y2 > s_prevY2 ) 
				{
					Y2 = s_prevY2;
				}
			}

			{
				if ( Y1 > Y2 )
				{
					s_tempValue = Y2;
					Y1 = Y2;
					Y2 = s_tempValue;
				}

				if ( X1 > X2 )
				{
					s_tempValue = X2;
					X1 = X2;
					X2 = s_tempValue;
				}
			}

			s_pen = s_pens[ iSquare ];

			if ( s_prevX2 > s_prevX1 )
			{
				width = s_prevX2 - s_prevX1;

				if ( Y1 > s_prevY1 )
				{
					crGFXDrawRectFast( s_scanlineBuffer + s_prevY1, s_prevX1 + width, width, Y1 - s_prevY1, s_pen );
				}

				if ( s_prevY2 > Y2 )
				{
					crGFXDrawRectFast( s_scanlineBuffer + Y2, s_prevX1 + width, width, s_prevY2 - Y2, s_pen );
				}
			}

			if ( Y2 > Y1 )
			{
				if ( X1 > s_prevX1 )
				{
					width = X1 - s_prevX1;
					crGFXDrawRectFast( s_scanlineBuffer + Y1, s_prevX1 + width, width, Y2 - Y1, s_pen );
				}

				if ( s_prevX2 > X2 )
				{
					width = s_prevX2 - X2;
					crGFXDrawRectFast( s_scanlineBuffer + Y1, X2 + width, width, Y2 - Y1, s_pen );
				}
			}

			s_prevX1 = X1;
			s_prevY1 = Y1;
			s_prevX2 = X2;
			s_prevY2 = Y2;
		}
	}