flag edges as either boundary or nonboundary
Deprecation Notice
Note that this function has been marked deprecated in the OpenGL 3.0 specification.
You should not be using this function in new code, though it will likely be supported
by most implementations via the GL_ARB_compatibility extension.
For more information on OpenGL 3.x deprecations, see the
deprecations page.
Signature
Parameters
| Variables | Description |
|---|---|
| flag |
Specifies the current edge flag value,
either
GL_TRUE
or
GL_FALSE
. The initial value is
GL_TRUE
.
|
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 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
.
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
Copyright
Copyright
1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/
.