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. 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(3G), glEnableClientState(3G), glGet(3G)