glEdgeFlag.3gl

Name

  glEdgeFlag, glEdgeFlagv - flag edges as either boundary or nonboundary

C Specification

  void glEdgeFlag( GLboolean flag )

Parameters

  flag	Specifies the current edge flag	value, either true or false.

C Specification

  void glEdgeFlagv( const GLboolean *flag )

Parameters

  flag Specifies a pointer to an array that contains a single Boolean

       element,	which replaces the current edge	flag value.

Description

  Each vertex of a polygon, separate triangle, or separate quadrilateral

  specified between a glBegin/glEnd pair is marked as the start	of either a

  boundary or nonboundary edge.	 If the	current	edge flag is true when the

  vertex is specified, the vertex is marked as the start of a boundary edge.

  Otherwise, the vertex	is marked as the start of a nonboundary	edge.

  glEdgeFlag sets the edge flag	to true	if flag	is nonzero, false otherwise.



  The vertices of connected triangles and connected quadrilaterals are always

  marked as boundary, regardless of the	value of the edge flag.



  Boundary and nonboundary edge	flags on vertices are significant only if

  GL_POLYGON_MODE is set to GL_POINT or	GL_LINE.  See glPolygonMode.



  Initially, the edge flag bit is true.

Notes

  The current edge flag	can be updated at any time.  In	particular,

  glEdgeFlag can be called between a call to glBegin and the corresponding

  call to glEnd.

Associated Gets

  glGet	with argument GL_EDGE_FLAG

See Also

  glBegin, glPolygonMode

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Last Edited: Mon, May 22, 1995

AFV