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GLISENABLED(3G)                                                                              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.  Ini-tially Initially
       tially all capabilities except GL_DITHER are disabled; GL_DITHER is initially enabled.

       The following capabilities are accepted for cap:


        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)





                                                                                             GLISENABLED(3G)