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glEdgeFlag, glEdgeFlagv - flag edges as either boundary or nonboundary
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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