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glEdgeFlag

Chapter 5

128

glEdgeFlag

glEdgeFlag, glEdgeFlagv: ﬂag edges as either boundary or non-boundary.

C Speciﬁcation

void glEdgeFlag(

GLboolean flag)

void glEdgeFlagv(

const GLboolean *flag)

Parameters

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

The initial value is GL_TRUE.

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 non-boundary 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 non-boundary

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 non-boundary edge ﬂags on vertices are signiﬁcant only if

GL_POLYGON_MODE is set toGL_POINT or GL_LINE. See glPolygonMode.

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

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