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| GLISENABLED() | GLISENABLED() |
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:
| 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_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_SCISSOR_TEST | glScissor |
| GL_STENCIL_TEST | glStencilFunc, glStencilOp |
| GL_TEXTURE_1D | glTexImage1D |
| GL_TEXTURE_2D | glTexImage2D |
| 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
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
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