glIsEnabled - test whether a capability is enabled
GLboolean glIsEnabled(
GLenum cap );
Specifies a symbolic constant indicating a GL capability.
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:
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Constant See
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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()
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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.
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().
glEnable(3), glEnableClientState(3), glGet(3)
glIsEnabled(3G)
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