glIsEnabled(3G)		       OpenGL Reference		       glIsEnabled(3G)



NAME
     glIsEnabled - test	whether	a capability is	enabled


C SPECIFICATION
     GLboolean glIsEnabled( GLenum cap )


PARAMETERS
     cap  Specifies a symbolic constant	indicating a GL	capability.

DESCRIPTION
     glIsEnabled returns GL_TRUE if cap	is an enabled capability and returns
     GL_FALSE otherwise.  The following	capabilities are accepted for cap:

     GL_ALPHA_TEST			    See	glAlphaFunc.
     GL_AUTO_NORMAL			    See	glEvalCoord.
     GL_BLEND				    See	glBlendFunc.
     GL_CLIP_PLANEi			    See	glClipPlane.
     GL_COLOR_MATERIAL			    See	glColorMaterial.
     GL_COLOR_TABLE_SGI			    See	glColorTableSGI.
     GL_CONVOLUTION_1D_EXT		    See	glConvolutionFilter1DEXT.
     GL_CONVOLUTION_2D_EXT		    See	glConvolutionFilter2DEXT.
     GL_CULL_FACE			    See	glCullFace.
     GL_DEPTH_TEST			    See	glDepthFunc and	 glDepthRange.
     GL_DITHER				    See	glEnable.
     GL_FOG				    See	glFog.
     GL_FOG_OFFSET_SGIX			    See	glFog.
     GL_HISTOGRAM_EXT			    See	glHistogramEXT.
     GL_INTERLACE_SGIX			    See	glCopyPixels and glCopyTexSubImage2DEXT.
     GL_LIGHTi				    See	glLightModel and glLight.
     GL_LIGHTING			    See	glMaterial, glLightModel, and glLight.
     GL_LINE_SMOOTH			    See	glLineWidth.
     GL_LINE_STIPPLE			    See	glLineStipple.
     GL_LOGIC_OP			    See	glLogicOp.
     GL_MAP1_COLOR_4			    See	glMap1.
     GL_MAP1_INDEX			    See	glMap1.
     GL_MAP1_NORMAL			    See	glMap1.
     GL_MAP1_TEXTURE_COORD_1		    See	glMap1.
     GL_MAP1_TEXTURE_COORD_2		    See	glMap1.
     GL_MAP1_TEXTURE_COORD_3		    See	glMap1.
     GL_MAP1_TEXTURE_COORD_4		    See	glMap1.
     GL_MAP1_VERTEX_3			    See	glMap1.
     GL_MAP1_VERTEX_4			    See	glMap1.
     GL_MAP2_COLOR_4			    See	glMap2.
     GL_MAP2_INDEX			    See	glMap2.
     GL_MAP2_NORMAL			    See	glMap2.
     GL_MAP2_TEXTURE_COORD_1		    See	glMap2.
     GL_MAP2_TEXTURE_COORD_2		    See	glMap2.
     GL_MAP2_TEXTURE_COORD_3		    See	glMap2.





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glIsEnabled(3G)		       OpenGL Reference		       glIsEnabled(3G)



     GL_MAP2_TEXTURE_COORD_4		    See	glMap2.
     GL_MAP2_VERTEX_3			    See	glMap2.
     GL_MAP2_VERTEX_4			    See	glMap2.
     GL_MINMAX_EXT			    See	glMinmaxEXT.
     GL_MULTISAMPLE_SGIS		    See	glSamplePatternSGIS, glSampleMaskSGIS.
     GL_NORMALIZE			    See	glNormal.
     GL_POINT_SMOOTH			    See	glPointSize.
     GL_POLYGON_SMOOTH			    See	glPolygonMode.
     GL_POLYGON_OFFSET_EXT		    See	glPolygonOffsetEXT.
     GL_POLYGON_STIPPLE			    See	glPolygonStipple.
     GL_POST_COLOR_MATRIX_COLOR_TABLE_SGI   See	glColorTableSGI.
     GL_POST_CONVOLUTION_COLOR_TABLE_SGI    See	glColorTableSGI.
     GL_REFERENCE_PLANE_SGIX		    See	glReferencePlaneSGIX.
     GL_SAMPLE_ALPHA_TO_MASK_SGIS	    See	glSampleMaskSGIS.
     GL_SAMPLE_ALPHA_TO_ONE_SGIS	    See	glSampleMaskSGIS.
     GL_SAMPLE_MASK_SGIS		    See	glSampleMaskSGIS.
     GL_SCISSOR_TEST			    See	glScissor.
     GL_SEPARABLE_2D_EXT		    See	glSeparableFilter2DEXT.
     GL_STENCIL_TEST			    See	glStencilFunc and glStencilOp.
     GL_TEXTURE_1D			    See	glTexImage1D.
     GL_TEXTURE_2D			    See	glTexImage2D.
     GL_TEXTURE_3D_EXT			    See	glTexImage3DEXT.
     GL_TEXTURE_COLOR_TABLE_SGI		    See	glColorTableSGI.
     GL_TEXTURE_GEN_Q			    See	glTexGen.
     GL_TEXTURE_GEN_R			    See	glTexGen.
     GL_TEXTURE_GEN_S			    See	glTexGen.
     GL_TEXTURE_GEN_T			    See	glTexGen.

NOTES
     If	an error is generated, glIsEnabled returns zero.

ERRORS
     GL_INVALID_ENUM is	generated if cap is not	an accepted value.

     GL_INVALID_OPERATION is generated if glIsEnabled is executed between the
     execution of glBegin and the corresponding	execution of glEnd.


MACHINE	DEPENDENCIES
     GL_COLOR_TABLE_SGI, GL_POST_COLOR_MATRIX_COLOR_TABLE_SGI and
     GL_POST_CONVOLUTION_COLOR_TABLE_SGI are part of the SGI_color_table
     extension which is	not supported on RealityEngine,	RealityEngine2,	and
     VTX systems.

     The SGIX_interlace	extension is supported only on InfiniteReality systems
     and on RealityEngine, RealityEngine2, and VTX systems.


SEE ALSO
     glEnable





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