glEdgeFlag — flag edges as either boundary or nonboundary
Specifies the current edge flag value,
GL_FALSE. The initial value is
|const GLboolean *||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,
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
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
glGet with argument
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