glIsEnabled.3G man page

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_SUM glSecondaryColor()
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_FOG_COORD_ARRAY glFogCoordPointer()
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_MULTISAMPLE glSampleCoverage()
GL_NORMAL_ARRAY glNormalPointer()
GL_NORMALIZE glNormal()
GL_POINT_SMOOTH glPointSize()
GL_POINT_SPRITE glEnable()
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_SAMPLE_ALPHA_TO_COVERAGE glSampleCoverage()
GL_SAMPLE_ALPHA_TO_ONE glSampleCoverage()
GL_SAMPLE_COVERAGE glSampleCoverage()
GL_SCISSOR_TEST glScissor()
GL_SECONDARY_COLOR_ARRAY glSecondaryColorPointer()
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_CUBE_MAP glTexImage2D()
GL_TEXTURE_GEN_Q glTexGen()
GL_TEXTURE_GEN_R glTexGen()
GL_TEXTURE_GEN_S glTexGen()
GL_TEXTURE_GEN_T glTexGen()
GL_VERTEX_ARRAY glVertexPointer()
GL_VERTEX_PROGRAM_POINT_SIZE glEnable()
GL_VERTEX_PROGRAM_TWO_SIDE glEnable()

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_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.

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(), glEnableClientState(), glGet()

Authors

opengl.org

Info

07/26/2017 opengl.org OpenGL Manual