glIsEnabled

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_CULL_FACE`	glCullFace
`GL_DEPTH_TEST`	glDepthFunc, glDepthRange
`GL_DITHER`	glEnable
`GL_EDGE_FLAG_ARRAY`	glEdgeFlagPointer
`GL_FOG`	glFog
`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, 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_NORMAL_ARRAY`	glNormalPointer
`GL_NORMALIZE`	glNormal
`GL_OCCLUSION_TEST_HP`	glEnable
`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_RESCALE_NORMAL_EXT`	glEnable
`GL_SCISSOR_TEST`	glScissor
`GL_STENCIL_TEST`	glStencilFunc, glStencilOp
`GL_TEXTURE_1D`	glTexImage1D
`GL_TEXTURE_2D`	glTexImage2D
`GL_TEXTURE_3D_EXT` (if 3D texturing is supported)	glTexImage3DEXT
`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 only available if the GL version is 1.1 or greater

Errors