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glIsEnabled (3)
  • >> glIsEnabled (3) ( Разные man: Библиотечные вызовы )
    •  

    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:


    

    

    

    ConstantSee
    

    

    GL_ALPHA_TESTglAlphaFunc
    

    GL_AUTO_NORMALglEvalCoord
    

    GL_BLENDglBlendFunc, glLogicOp
    

    GL_CLIP_PLANEiglClipPlane
    

    GL_COLOR_ARRAYglColorPointer
    

    GL_COLOR_LOGIC_OPglLogicOp
    

    GL_COLOR_MATERIALglColorMaterial
    

    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_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_NORMAL_ARRAYglNormalPointer
    

    GL_NORMALIZEglNormal
    

    GL_POINT_SMOOTHglPointSize
    

    GL_POLYGON_SMOOTHglPolygonMode
    

    GL_POLYGON_OFFSET_FILL glPolygonOffset
    

    GL_POLYGON_OFFSET_LINE glPolygonOffset
    

    GL_POLYGON_OFFSET_POINT glPolygonOffset
    

    GL_POLYGON_STIPPLEglPolygonStipple
    

    GL_POST_COLOR_MATRIX_COLOR_TABLEglColorTable
    

    GL_POST_CONVOLUTION_COLOR_TABLEglColorTable
    

    GL_RESCALE_NORMALglNormal
    

    GL_SCISSOR_TESTglScissor
    

    GL_SEPARABLE_2DglSeparableFilter2D
    

    GL_STENCIL_TESTglStencilFunc, glStencilOp
    

    GL_TEXTURE_1DglTexImage1D
    

    GL_TEXTURE_2DglTexImage2D
    

    GL_TEXTURE_3DglTexImage3D
    

    GL_TEXTURE_COORD_ARRAYglTexCoordPointer
    

    GL_TEXTURE_GEN_QglTexGen
    

    GL_TEXTURE_GEN_RglTexGen
    

    GL_TEXTURE_GEN_SglTexGen
    

    GL_TEXTURE_GEN_TglTexGen
    

    GL_VERTEX_ARRAYglVertexPointer
    

    

    


    
 

    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)

    

    


    
 
    Index
    

    

    NAME
    

    C SPECIFICATION
    

    PARAMETERS
    

    DESCRIPTION
    

    NOTES
    

    ERRORS
    

    SEE ALSO
    

    

    

    

    

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