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Manual Reference Pages  - GLEDGEFLAG (3G)

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glEdgeFlag, glEdgeFlagv - flag edges as either boundary or nonboundary

CONTENTS

C Specification
Parameters
C Specification
Parameters
Description
Notes
Associated Gets
See Also

void glEdgeFlag( GLboolean flag )

flag	Specifies the current edge flag value, either  GL_TRUE or  GL_FALSE. The initial value is  GL_TRUE.

void glEdgeFlagv( const GLboolean *flag )

flag	Specifies a pointer to an array that contains a single boolean element, which replaces the current edge flag value.

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 bit to  GL_TRUE if flag is  GL_TRUE, and to  GL_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.

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.

 glGet with argument  GL_EDGE_FLAG

 glBegin(3G),  glEdgeFlagPointer(3G),  glPolygonMode(3G)

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