66 lines
1.9 KiB
Plaintext
66 lines
1.9 KiB
Plaintext
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'\" e
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'\"! eqn | mmdoc
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'\"macro stdmacro
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.ds Vn Version 1.2
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.ds Dt 24 September 1999
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.ds Re Release 1.2.1
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.ds Dp Jan 14 18:30
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.ds Dm 01 edgeflag.
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.ds Xs 46953 4 edgeflag.gl
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.TH GLEDGEFLAG 3G
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.SH NAME
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.B "glEdgeFlag, glEdgeFlagv
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\- flag edges as either boundary or nonboundary
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.SH C SPECIFICATION
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void \f3glEdgeFlag\fP(
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GLboolean \fIflag\fP )
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.nf
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.fi
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.SH PARAMETERS
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.TP \w'\f2flag\fP\ \ 'u
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\f2flag\fP
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Specifies the current edge flag value,
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either \%\f3GL_TRUE\fP or \%\f3GL_FALSE\fP. The initial value is \%\f3GL_TRUE\fP.
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.SH C SPECIFICATION
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void \f3glEdgeFlagv\fP(
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const GLboolean \fI*flag\fP )
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.nf
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.fi
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.SH PARAMETERS
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.TP
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\f2flag\fP
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Specifies a pointer to an array that contains a single boolean element,
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which replaces the current edge flag value.
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.SH DESCRIPTION
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Each vertex of a polygon,
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separate triangle,
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or separate quadrilateral specified between a \%\f3glBegin\fP/\%\f3glEnd\fP pair
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is marked as the start of either a boundary or nonboundary edge.
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If the current edge flag is true when the vertex is specified,
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the vertex is marked as the start of a boundary edge.
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Otherwise, the vertex is marked as the start of a nonboundary edge.
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\%\f3glEdgeFlag\fP sets the edge flag bit to \%\f3GL_TRUE\fP if \f2flag\fP is \%\f3GL_TRUE\fP,
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and to \%\f3GL_FALSE\fP otherwise.
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.P
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The vertices of connected triangles and connected quadrilaterals are always
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marked as boundary,
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regardless of the value of the edge flag.
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.P
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Boundary and nonboundary edge flags on vertices are significant only if
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\%\f3GL_POLYGON_MODE\fP is set to \%\f3GL_POINT\fP or \%\f3GL_LINE\fP.
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See \%\f3glPolygonMode\fP.
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.SH NOTES
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The current edge flag can be updated at any time.
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In particular,
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\%\f3glEdgeFlag\fP can be called between a call to \%\f3glBegin\fP and the corresponding
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call to \%\f3glEnd\fP.
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.SH ASSOCIATED GETS
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\%\f3glGet\fP with argument \%\f3GL_EDGE_FLAG\fP
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.SH SEE ALSO
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\%\f3glBegin(3G)\fP,
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\%\f3glEdgeFlagPointer(3G)\fP,
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\%\f3glPolygonMode(3G)\fP
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