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<STRONG>NAME</STRONG>
<STRONG>glIsEnabled</STRONG> - test whether a capability is enabled
<STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>
GLboolean <STRONG>glIsEnabled</STRONG>( GLenum <EM>cap</EM> )
<STRONG>PARAMETERS</STRONG>
<EM>cap</EM> Specifies a symbolic constant indicating a GL
capability.
<STRONG>DESCRIPTION</STRONG>
<STRONG>glIsEnabled</STRONG> returns <STRONG>GL_TRUE</STRONG> if <EM>cap</EM> is an enabled capability
and returns <STRONG>GL_FALSE</STRONG> otherwise. Initially all capabilities
except <STRONG>GL_DITHER</STRONG> are disabled; <STRONG>GL_DITHER</STRONG> is initially
enabled.
The following capabilities are accepted for <EM>cap</EM>:
<STRONG>Constant</STRONG> <STRONG>See</STRONG>
_______________________________________________________________
<STRONG>GL_ALPHA_TEST</STRONG> <STRONG>glAlphaFunc</STRONG>
<STRONG>GL_AUTO_NORMAL</STRONG> <STRONG>glEvalCoord</STRONG>
<STRONG>GL_BLEND</STRONG> <STRONG>glBlendFunc</STRONG>, <STRONG>glLogicOp</STRONG>
<STRONG>GL_CLIP_PLANE</STRONG><EM>i</EM> <STRONG>glClipPlane</STRONG>
<STRONG>GL_COLOR_ARRAY</STRONG> <STRONG>glColorPointer</STRONG>
<STRONG>GL_COLOR_LOGIC_OP</STRONG> <STRONG>glLogicOp</STRONG>
<STRONG>GL_COLOR_MATERIAL</STRONG> <STRONG>glColorMaterial</STRONG>
<STRONG>GL_CULL_FACE</STRONG> <STRONG>glCullFace</STRONG>
<STRONG>GL_DEPTH_TEST</STRONG> <STRONG>glDepthFunc</STRONG>, <STRONG>glDepthRange</STRONG>
<STRONG>GL_DITHER</STRONG> <STRONG>glEnable</STRONG>
<STRONG>GL_EDGE_FLAG_ARRAY</STRONG> <STRONG>glEdgeFlagPointer</STRONG>
<STRONG>GL_FOG</STRONG> <STRONG>glFog</STRONG>
<STRONG>GL_INDEX_ARRAY</STRONG> <STRONG>glIndexPointer</STRONG>
<STRONG>GL_INDEX_LOGIC_OP</STRONG> <STRONG>glLogicOp</STRONG>
<STRONG>GL_LIGHT</STRONG><EM>i</EM> <STRONG>glLightModel</STRONG>, <STRONG>glLight</STRONG>
<STRONG>GL_LIGHTING</STRONG> <STRONG>glMaterial</STRONG>, <STRONG>glLightModel</STRONG>, <STRONG>glLight</STRONG>
<STRONG>GL_LINE_SMOOTH</STRONG> <STRONG>glLineWidth</STRONG>
<STRONG>GL_LINE_STIPPLE</STRONG> <STRONG>glLineStipple</STRONG>
<STRONG>GL_MAP1_COLOR_4</STRONG> <STRONG>glMap1</STRONG>, <STRONG>glMap2</STRONG>
<STRONG>GL_MAP2_TEXTURE_COORD_2</STRONG> <STRONG>glMap2</STRONG>
<STRONG>GL_MAP2_TEXTURE_COORD_3</STRONG> <STRONG>glMap2</STRONG>
<STRONG>GL_MAP2_TEXTURE_COORD_4</STRONG> <STRONG>glMap2</STRONG>
<STRONG>GL_MAP2_VERTEX_3</STRONG> <STRONG>glMap2</STRONG>
<STRONG>GL_MAP2_VERTEX_4</STRONG> <STRONG>glMap2</STRONG>
<STRONG>GL_NORMAL_ARRAY</STRONG> <STRONG>glNormalPointer</STRONG>
<STRONG>GL_NORMALIZE</STRONG> <STRONG>glNormal</STRONG>
<STRONG>GL_POINT_SMOOTH</STRONG> <STRONG>glPointSize</STRONG>
<STRONG>GL_POLYGON_SMOOTH</STRONG> <STRONG>glPolygonMode</STRONG>
<STRONG>GL_POLYGON_OFFSET_FILL</STRONG> <STRONG>glPolygonOffset</STRONG>
<STRONG>GL_POLYGON_OFFSET_LINE</STRONG> <STRONG>glPolygonOffset</STRONG>
<STRONG>GL_POLYGON_OFFSET_POINT</STRONG> <STRONG>glPolygonOffset</STRONG>
<STRONG>GL_POLYGON_STIPPLE</STRONG> <STRONG>glPolygonStipple</STRONG>
<STRONG>GL_SCISSOR_TEST</STRONG> <STRONG>glScissor</STRONG>
<STRONG>GL_STENCIL_TEST</STRONG> <STRONG>glStencilFunc</STRONG>, <STRONG>glStencilOp</STRONG>
<STRONG>GL_TEXTURE_1D</STRONG> <STRONG>glTexImage1D</STRONG>
<STRONG>GL_TEXTURE_2D</STRONG> <STRONG>glTexImage2D</STRONG>
<STRONG>GL_TEXTURE_COORD_ARRAY</STRONG> <STRONG>glTexCoordPointer</STRONG>
<STRONG>GL_TEXTURE_GEN_Q</STRONG> <STRONG>glTexGen</STRONG>
<STRONG>GL_TEXTURE_GEN_R</STRONG> <STRONG>glTexGen</STRONG>
<STRONG>GL_TEXTURE_GEN_S</STRONG> <STRONG>glTexGen</STRONG>
<STRONG>GL_TEXTURE_GEN_T</STRONG> <STRONG>glTexGen</STRONG>
<STRONG>GL_VERTEX_ARRAY</STRONG> <STRONG>glVertexPointer</STRONG>
<STRONG>NOTES</STRONG>
If an error is generated, <STRONG>glIsEnabled</STRONG> returns 0.
<STRONG>GL_COLOR_LOGIC_OP</STRONG>, <STRONG>GL_COLOR_ARRAY</STRONG>, <STRONG>GL_EDGE_FLAG_ARRAY</STRONG>,
<STRONG>GL_INDEX_ARRAY</STRONG>, <STRONG>GL_INDEX_LOGIC_OP</STRONG>, <STRONG>GL_NORMAL_ARRAY</STRONG>,
<STRONG>GL_POLYGON_OFFSET_FILL</STRONG>, <STRONG>GL_POLYGON_OFFSET_LINE</STRONG>,
<STRONG>GL_POLYGON_OFFSET_POINT</STRONG>, <STRONG>GL_TEXTURE_COORD_ARRAY</STRONG>, and
<STRONG>GL_VERTEX_ARRAY</STRONG> are only available if the GL version is 1.1
or greater
<STRONG>ERRORS</STRONG>
<STRONG>GL_INVALID_ENUM</STRONG> is generated if <EM>cap</EM> is not an accepted
value.
<STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glIsEnabled</STRONG> is executed
between the execution of <STRONG>glBegin</STRONG> and the corresponding
execution of <STRONG>glEnd</STRONG>.
<STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>
<STRONG>glEnable</STRONG>, <STRONG>glEnableClientState</STRONG>
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