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glIsEnabled(3G)


NAME

  glIsEnabled - test whether a capability is enabled


SYNOPSIS

  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. Initially all capabilities except GL_DITHER are
  disabled; GL_DITHER is initially enabled.

  The following capabilities are accepted for cap:

  ________________________________________________________________________
  Constant			     See
  ________________________________________________________________________
  GL_ALPHA_TEST			     glAlphaFunc()
  GL_AUTO_NORMAL		     glEvalCoord()
  GL_BLEND

				     glBlendFunc(), glLogicOp()
  GL_CLIP_PLANEi		     glClipPlane()
  GL_COLOR_ARRAY		     glColorPointer()
  GL_COLOR_LOGIC_OP		     glLogicOp()
  GL_COLOR_MATERIAL		     glColorMaterial()
  GL_COLOR_TABLE		     glColorTable()
  GL_CONVOLUTION_1D		     glConvolutionFilter1D()
  GL_CONVOLUTION_2D		     glConvolutionFilter2D()
  GL_CULL_FACE			     glCullFace()
  GL_DEPTH_TEST

				     glDepthFunc(), glDepthRange()
  GL_DITHER			     glEnable()
  GL_EDGE_FLAG_ARRAY		     glEdgeFlagPointer()
  GL_FOG			     glFog()
  GL_HISTOGRAM			     glHistogram()
  GL_INDEX_ARRAY		     glIndexPointer()
  GL_INDEX_LOGIC_OP		     glLogicOp()
  GL_LIGHTi

				     glLightModel(), glLight()
  GL_LIGHTING

				     glMaterial(), glLightModel(),
				     glLight()
  GL_LINE_SMOOTH		     glLineWidth()
  GL_LINE_STIPPLE		     glLineStipple()
  GL_MAP1_COLOR_4		     glMap1()
  GL_MAP1_INDEX			     glMap1()
  GL_MAP1_NORMAL		     glMap1()
  GL_MAP1_TEXTURE_COORD_1	     glMap1()
  GL_MAP1_TEXTURE_COORD_2	     glMap1()
  GL_MAP1_TEXTURE_COORD_3	     glMap1()
  GL_MAP1_TEXTURE_COORD_4	     glMap1()
  GL_MAP2_COLOR_4		     glMap2()
  GL_MAP2_INDEX			     glMap2()
  GL_MAP2_NORMAL		     glMap2()
  GL_MAP2_TEXTURE_COORD_1	     glMap2()
  GL_MAP2_TEXTURE_COORD_2	     glMap2()
  GL_MAP2_TEXTURE_COORD_3	     glMap2()
  GL_MAP2_TEXTURE_COORD_4	     glMap2()
  GL_MAP2_VERTEX_3		     glMap2()
  GL_MAP2_VERTEX_4		     glMap2()
  GL_MINMAX			     glMinmax()
  GL_NORMAL_ARRAY		     glNormalPointer()
  GL_NORMALIZE			     glNormal()
  GL_POINT_SMOOTH		     glPointSize()
  GL_POLYGON_SMOOTH		     glPolygonMode()
  GL_POLYGON_OFFSET_FILL	     glPolygonOffset()
  GL_POLYGON_OFFSET_LINE	     glPolygonOffset()
  GL_POLYGON_OFFSET_POINT	     glPolygonOffset()
  GL_POLYGON_STIPPLE		     glPolygonStipple()
  GL_POST_COLOR_MATRIX_COLOR_TABLE   glColorTable()
  GL_POST_CONVOLUTION_COLOR_TABLE    glColorTable()
  GL_RESCALE_NORMAL		     glNormal()
  GL_SCISSOR_TEST		     glScissor()
  GL_SEPARABLE_2D		     glSeparableFilter2D()
  GL_STENCIL_TEST

				     glStencilFunc(), glStencilOp()
  GL_TEXTURE_1D			     glTexImage1D()
  GL_TEXTURE_2D			     glTexImage2D()
  GL_TEXTURE_3D			     glTexImage3D()
  GL_TEXTURE_COORD_ARRAY	     glTexCoordPointer()
  GL_TEXTURE_GEN_Q		     glTexGen()
  GL_TEXTURE_GEN_R		     glTexGen()
  GL_TEXTURE_GEN_S		     glTexGen()
  GL_TEXTURE_GEN_T		     glTexGen()
  GL_VERTEX_ARRAY		     glVertexPointer()
  ________________________________________________________________________


NOTES

  If an error is generated, glIsEnabled() returns 0.

  GL_COLOR_LOGIC_OP, GL_COLOR_ARRAY, GL_EDGE_FLAG_ARRAY, GL_INDEX_ARRAY,
  GL_INDEX_LOGIC_OP, GL_NORMAL_ARRAY, GL_POLYGON_OFFSET_FILL,
  GL_POLYGON_OFFSET_LINE, GL_POLYGON_OFFSET_POINT, GL_TEXTURE_COORD_ARRAY,
  and GL_VERTEX_ARRAY are available only if the GL version is 1.1 or greater

  GL_RESCALE_NORMAL, and GL_TEXTURE_3D are available only if the GL version
  is 1.2 or greater.

  GL_COLOR_TABLE, GL_CONVOLUTION_1D, GL_CONVOLUTION_2D, GL_HISTOGRAM,
  GL_MINMAX, GL_POST_COLOR_MATRIX_COLOR_TABLE,
  GL_POST_CONVOLUTION_COLOR_TABLE, and GL_SEPARABLE_2D are available only if
  GL_ARB_imaging is returned when glGet() is called with GL_EXTENSIONS.

  When the GL_ARB_multitexture extension is supported, the following
  parameters return the associated value for the active texture unit.
  GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D,
  GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D, GL_TEXTURE_GEN_S, GL_TEXTURE_GEN_T,
  GL_TEXTURE_GEN_R, GL_TEXTURE_GEN_Q, GL_TEXTURE_MATRIX, and
  GL_TEXTURE_STACK_DEPTH.  Likewise, the following parameters return the
  associated value for the active client texture unit:
  GL_TEXTURE_COORD_ARRAY, GL_TEXTURE_COORD_ARRAY_SIZE,
  GL_TEXTURE_COORD_ARRAY_STRIDE, GL_TEXTURE_COORD_ARRAY_TYPE.


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().


SEE ALSO

  glEnable(3), glEnableClientState(3), glGet(3)

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