Marks edges as either boundary or nonboundary.
OpenGL C bindings library: libGL.a
void glEdgeFlag(GLboolean Flag)
void glEdgeFlagv(const GLboolean *Flagv)
Each vertex of a polygon, separate triangle, or separate quadrilateral specified between glBegin and glEnd 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 to True if the Flag parameter is nonzero; otherwise, the edge flag is set to False.
The vertices of connected triangles and connected quadrilaterals are always marked as a 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.
Initially, the edge flag bit is True.
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 for the glEdgeFlag subroutine are as follows. (See the glGet subroutine for more information.)
glGet with argument GL_EDGE_FLAG.
| /usr/include/GL/gl.h | Contains C language constants, variable type definitions, and ANSI function prototypes for OpenGL. |
The glBegin subroutine, glEdgeFlagPointer subroutine, glEdgeFlagPointerEXT subroutine, glEnd subroutine, glPolygonMode subroutine.