Method GL.glIsEnabled()

Method glIsEnabled

int glIsEnabled(int cap)

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_TESTglAlphaFunc
GL_AUTO_NORMALglEvalCoord
GL_BLENDglBlendFunc, glLogicOp
GL_CLIP_PLANEiglClipPlane
GL_COLOR_ARRAYglColorPointer
GL_COLOR_LOGIC_OPglLogicOp
GL_COLOR_MATERIALglColorMaterial
GL_COLOR_SUMglSecondaryColor
GL_COLOR_TABLEglColorTable
GL_CONVOLUTION_1DglConvolutionFilter1D
GL_CONVOLUTION_2DglConvolutionFilter2D
GL_CULL_FACEglCullFace
GL_DEPTH_TESTglDepthFunc, glDepthRange
GL_DITHERglEnable
GL_EDGE_FLAG_ARRAYglEdgeFlagPointer
GL_FOGglFog
GL_FOG_COORD_ARRAYglFogCoordPointer
GL_HISTOGRAMglHistogram
GL_INDEX_ARRAYglIndexPointer
GL_INDEX_LOGIC_OPglLogicOp
GL_LIGHTiglLightModel, glLight
GL_LIGHTINGglMaterial, glLightModel, glLight
GL_LINE_SMOOTHglLineWidth
GL_LINE_STIPPLEglLineStipple
GL_MAP1_COLOR_4glMap1
GL_MAP1_INDEXglMap1
GL_MAP1_NORMALglMap1
GL_MAP1_TEXTURE_COORD_1glMap1
GL_MAP1_TEXTURE_COORD_2glMap1
GL_MAP1_TEXTURE_COORD_3glMap1
GL_MAP1_TEXTURE_COORD_4glMap1
GL_MAP2_COLOR_4glMap2
GL_MAP2_INDEXglMap2
GL_MAP2_NORMALglMap2
GL_MAP2_TEXTURE_COORD_1glMap2
GL_MAP2_TEXTURE_COORD_2glMap2
GL_MAP2_TEXTURE_COORD_3glMap2
GL_MAP2_TEXTURE_COORD_4glMap2
GL_MAP2_VERTEX_3glMap2
GL_MAP2_VERTEX_4glMap2
GL_MINMAXglMinmax
GL_MULTISAMPLEglSampleCoverage
GL_NORMAL_ARRAYglNormalPointer
GL_NORMALIZEglNormal
GL_POINT_SMOOTHglPointSize
GL_POINT_SPRITEglEnable
GL_POLYGON_SMOOTHglPolygonMode
GL_POLYGON_OFFSET_FILLglPolygonOffset
GL_POLYGON_OFFSET_LINEglPolygonOffset
GL_POLYGON_OFFSET_POINTglPolygonOffset
GL_POLYGON_STIPPLEglPolygonStipple
GL_POST_COLOR_MATRIX_COLOR_TABLEglColorTable
GL_POST_CONVOLUTION_COLOR_TABLEglColorTable
GL_RESCALE_NORMALglNormal
GL_SAMPLE_ALPHA_TO_COVERAGEglSampleCoverage
GL_SAMPLE_ALPHA_TO_ONEglSampleCoverage
GL_SAMPLE_COVERAGEglSampleCoverage
GL_SCISSOR_TESTglScissor
GL_SECONDARY_COLOR_ARRAYglSecondaryColorPointer
GL_SEPARABLE_2DglSeparableFilter2D
GL_STENCIL_TESTglStencilFunc, glStencilOp
GL_TEXTURE_1DglTexImage1D
GL_TEXTURE_2DglTexImage2D
GL_TEXTURE_3DglTexImage3D
GL_TEXTURE_COORD_ARRAYglTexCoordPointer
GL_TEXTURE_CUBE_MAPglTexImage2D
GL_TEXTURE_GEN_QglTexGen
GL_TEXTURE_GEN_RglTexGen
GL_TEXTURE_GEN_SglTexGen
GL_TEXTURE_GEN_TglTexGen
GL_VERTEX_ARRAYglVertexPointer
GL_VERTEX_PROGRAM_POINT_SIZEglEnable
GL_VERTEX_PROGRAM_TWO_SIDEglEnable

Parameter cap

Specifies a symbolic constant indicating a GL capability.

Throws

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.

Note

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_MULTISAMPLE, GL_SAMPLE_ALPHA_TO_COVERAGE, GL_SAMPLE_ALPHA_TO_ONE, GL_SAMPLE_COVERAGE, GL_TEXTURE_CUBE_MAP are available only if the GL version is 1.3 or greater.

GL_FOG_COORD_ARRAY and GL_SECONDARY_COLOR_ARRAY are available only if the GL version is 1.4 or greater.

GL_POINT_SPRITE, GL_VERTEX_PROGRAM_POINT_SIZE, and GL_VERTEX_PROGRAM_TWO_SIDE are available only if the GL version is 2.0 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 ARB_imaging is returned when glGet is called with GL_EXTENSIONS.

For OpenGL versions 1.3 and greater, or when the ARB_multitexture extension is supported, the following parameters return the associated value for the active texture unit: GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_CUBE_MAP, 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.

See also

glEnable, glEnableClientState, glGet