NAME
	  glRectd, glRectf, glRecti, glRects, glRectdv,	glRectfv,
	  glRectiv, glRectsv - draw a rectangle


     C SPECIFICATION
	  void glRectd(	GLdouble x1,
			GLdouble y1,
			GLdouble x2,
			GLdouble y2 )
	  void glRectf(	GLfloat	x1,
			GLfloat	y1,
			GLfloat	x2,
			GLfloat	y2 )
	  void glRecti(	GLint x1,
			GLint y1,
			GLint x2,
			GLint y2 )
	  void glRects(	GLshort	x1,
			GLshort	y1,
			GLshort	x2,
			GLshort	y2 )


     PARAMETERS
	  x1, y1 Specify one vertex of a rectangle.

	  x2, y2 Specify the opposite vertex of	the rectangle.

     C SPECIFICATION
	  void glRectdv( const GLdouble	*v1,
			 const GLdouble	*v2 )
	  void glRectfv( const GLfloat *v1,
			 const GLfloat *v2 )
	  void glRectiv( const GLint *v1,
			 const GLint *v2 )
	  void glRectsv( const GLshort *v1,
			 const GLshort *v2 )


     PARAMETERS
	  v1   Specifies a pointer to one vertex of a rectangle.

	  v2   Specifies a pointer to the opposite vertex of the
	       rectangle.

     DESCRIPTION
	  glRect supports efficient specification of rectangles	as two
	  corner points.  Each rectangle command takes four arguments,
	  organized either as two consecutive pairs of (x,y)
	  coordinates, or as two pointers to arrays, each containing
	  an (x,y) pair.  The resulting	rectangle is defined in	the
	  z=0 plane.

	  glRect(x1, y1, x2, y2) is exactly equivalent to the
	  following sequence:  glBegin(GL_POLYGON); glVertex2(x1, y1);
	  glVertex2(x2,	y1); glVertex2(x2, y2);	glVertex2(x1, y2);
	  glEnd(); Note	that if	the second vertex is above and to the
	  right	of the first vertex, the rectangle is constructed with
	  a counterclockwise winding.

     ERRORS
	  GL_INVALID_OPERATION is generated if glRect is executed
	  between the execution	of glBegin and the corresponding
	  execution of glEnd.

     SEE ALSO
	  glBegin, glVertex