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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)


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