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GLISENABLED(3G) 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. Ini-tially Initially
tially all capabilities except GL_DITHER are disabled; GL_DITHER is initially enabled.
The following capabilities are accepted for cap:
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(3G), glEnableClientState(3G), glGet(3G)
GLISENABLED(3G)
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