'\"! eqn|tbl | mmdoc
'\"macro stdmacro
.ds Vn Version 1.2
.ds Dt 6 March 1997
.ds Re Release 1.1.0
.ds Dp Mar 17 18:06
.ds Dm  Mar  6 20:0
.ds Xs 62012 7 isenabled.gl
.TH GLISENABLED
.SH NAME
.B "glIsEnabled
\- test whether a capability is enabled

.SH C SPECIFICATION
GLboolean \f3glIsEnabled\fP(
GLenum \fIcap\fP )
.nf
.fi

.SH PARAMETERS
.TP \w'\f2cap\fP\ \ 'u 
\f2cap\fP
Specifies a symbolic constant indicating a GL capability.
.SH DESCRIPTION
\f3glIsEnabled\fP returns \f3GL_TRUE\fP if \f2cap\fP is an enabled capability
and returns \f3GL_FALSE\fP otherwise.
Initially all capabilities except \f3GL_DITHER\fP are disabled;
\f3GL_DITHER\fP is initially enabled.
.P
The following capabilities are accepted for \f2cap\fP:
.P
.TS
lb lb
l l l.
Constant	See
_

\f3GL_ALPHA_TEST\fP	\f3glAlphaFunc\fP
\f3GL_AUTO_NORMAL\fP	\f3glEvalCoord\fP
\f3GL_BLEND\fP	\f3glBlendFunc\fP, \f3glLogicOp\fP
\f3GL_CLIP_PLANE\fP\f2i\fP	\f3glClipPlane\fP
\f3GL_COLOR_ARRAY\fP	\f3glColorPointer\fP
\f3GL_COLOR_LOGIC_OP\fP	\f3glLogicOp\fP
\f3GL_COLOR_MATERIAL\fP	\f3glColorMaterial\fP
\f3GL_CULL_FACE\fP	\f3glCullFace\fP
\f3GL_DEPTH_TEST\fP	\f3glDepthFunc\fP, \f3glDepthRange\fP
\f3GL_DITHER\fP	\f3glEnable\fP
\f3GL_EDGE_FLAG_ARRAY\fP	\f3glEdgeFlagPointer\fP
\f3GL_FOG\fP	\f3glFog\fP
\f3GL_INDEX_ARRAY\fP	\f3glIndexPointer\fP
\f3GL_INDEX_LOGIC_OP\fP	\f3glLogicOp\fP
\f3GL_LIGHT\fP\f2i\fP	\f3glLightModel\fP, \f3glLight\fP
\f3GL_LIGHTING\fP	\f3glMaterial\fP, \f3glLightModel\fP, \f3glLight\fP
\f3GL_LINE_SMOOTH\fP	\f3glLineWidth\fP
\f3GL_LINE_STIPPLE\fP	\f3glLineStipple\fP
\f3GL_MAP1_COLOR_4\fP	\f3glMap1\fP, \f3glMap2\fP
\f3GL_MAP2_TEXTURE_COORD_2\fP	\f3glMap2\fP
\f3GL_MAP2_TEXTURE_COORD_3\fP	\f3glMap2\fP
\f3GL_MAP2_TEXTURE_COORD_4\fP	\f3glMap2\fP
\f3GL_MAP2_VERTEX_3\fP	\f3glMap2\fP
\f3GL_MAP2_VERTEX_4\fP	\f3glMap2\fP
\f3GL_NORMAL_ARRAY\fP	\f3glNormalPointer\fP
\f3GL_NORMALIZE\fP	\f3glNormal\fP
\f3GL_POINT_SMOOTH\fP	\f3glPointSize\fP
\f3GL_POLYGON_SMOOTH\fP	\f3glPolygonMode\fP
\f3GL_POLYGON_OFFSET_FILL\fP 	\f3glPolygonOffset\fP
\f3GL_POLYGON_OFFSET_LINE\fP 	\f3glPolygonOffset\fP
\f3GL_POLYGON_OFFSET_POINT\fP 	\f3glPolygonOffset\fP
\f3GL_POLYGON_STIPPLE\fP	\f3glPolygonStipple\fP
\f3GL_SCISSOR_TEST\fP	\f3glScissor\fP
\f3GL_STENCIL_TEST\fP	\f3glStencilFunc\fP, \f3glStencilOp\fP
\f3GL_TEXTURE_1D\fP	\f3glTexImage1D\fP
\f3GL_TEXTURE_2D\fP	\f3glTexImage2D\fP
\f3GL_TEXTURE_COORD_ARRAY\fP	\f3glTexCoordPointer\fP
\f3GL_TEXTURE_GEN_Q\fP	\f3glTexGen\fP
\f3GL_TEXTURE_GEN_R\fP	\f3glTexGen\fP
\f3GL_TEXTURE_GEN_S\fP	\f3glTexGen\fP
\f3GL_TEXTURE_GEN_T\fP	\f3glTexGen\fP
\f3GL_VERTEX_ARRAY\fP	\f3glVertexPointer\fP
.TE
.SH NOTES
If an error is generated,
\f3glIsEnabled\fP returns 0.
.P
\f3GL_COLOR_LOGIC_OP\fP, 
\f3GL_COLOR_ARRAY\fP,
\f3GL_EDGE_FLAG_ARRAY\fP,
\f3GL_INDEX_ARRAY\fP,
\f3GL_INDEX_LOGIC_OP\fP,
\f3GL_NORMAL_ARRAY\fP,
\f3GL_POLYGON_OFFSET_FILL\fP,  
\f3GL_POLYGON_OFFSET_LINE\fP,
\f3GL_POLYGON_OFFSET_POINT\fP,
\f3GL_TEXTURE_COORD_ARRAY\fP, and
\f3GL_VERTEX_ARRAY\fP
are only available
if the GL version is 1.1 or greater
.SH ERRORS
\f3GL_INVALID_ENUM\fP is generated if \f2cap\fP is not an accepted value.
.P
\f3GL_INVALID_OPERATION\fP is generated if \f3glIsEnabled\fP
is executed between the execution of \f3glBegin\fP
and the corresponding execution of \f3glEnd\fP.
.SH SEE ALSO
\f3glEnable\fP,
\f3glEnableClientState\fP