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The gllsEnabled function tests whether a capability is enabled.
GLboolean glIsEnabled(
GLenum cap);
- cap
A symbolic constant indicating an OpenGL capability. The following capabilities are accepted.GL_ALPHA_TEST See glAlphaFunc GL_AUTO_NORMAL See glEvalCoord GL_BLEND See glBlendFunc GL_CLIP_PLANEi See glClipPlane GL_COLOR_ARRAY See glColorPointer GL_COLOR_LOGIC_OP See glLogicOp GL_COLOR_MATERIAL See glColorMaterial GL_CULL_FACE See glCullFace GL_DEPTH_TEST See glDepthFunc and glDepthRange GL_DITHER See glEnable GL_FOG See glFog GL_INDEX_ARRAY See glIndexPointer GL_INDEX_LOGIC_OP See glLogicOp GL_LIGHTi See glLightModel and glLight GL_LIGHTING See glMaterial, glLightModel, and glLight GL_LINE_SMOOTH See glLineWidth GL_LINE_STIPPLE See glLineStipple GL_MAP1_COLOR_4 See glMap1 GL_MAP1_INDEX See glMap1 GL_MAP1_NORMAL See glMap1 GL_MAP1_TEXTURE_COORD_1 See glMap1 GL_MAP1_TEXTURE_COORD_2 See glMap1 GL_MAP1_TEXTURE_COORD_3 See glMap1 GL_MAP1_TEXTURE_COORD_4 See glMap1 GL_MAP1_VERTEX_3 See glMap1 GL_MAP1_VERTEX_4 See glMap1 GL_MAP2_COLOR_4 See glMap2 GL_MAP2_INDEX See glMap2 GL_MAP2_NORMAL See glMap2 GL_MAP2_TEXTURE_COORD_1 See glMap2 GL_MAP2_TEXTURE_COORD_2 See glMap2 GL_MAP2_TEXTURE_COORD_3 See glMap2 GL_MAP2_TEXTURE_COORD_4 See glMap2 GL_MAP2_VERTEX_3 See glMap2 GL_MAP2_VERTEX_4 See glMap2 GL_NORMAL_ARRAY See glNormalPointer GL_NORMALIZE See glNormal GL_POINT_SMOOTH See glPointSize GL_POLYGON_OFFSET_FILL See glPolygonOffset GL_POLYGON_OFFSET_LINE See glPolygonOffset GL_POLYGON_OFFSET_POINT See glPolygonOffset GL_POLYGON_SMOOTH See glPolygonMode GL_POLYGON_STIPPLE See glPolygonStipple GL_SCISSOR_TEST See glScissor GL_STENCIL_TEST See glStencilFunc and glStencilOp GL_TEXTURE_1D See glTexImage1D GL_TEXTURE_2D See glTexImage2D GL_TEXTURE_COORD_ARRAY See glTexCoordPointer. GL_TEXTURE_GEN_Q See glTexGen GL_TEXTURE_GEN_R See glTexGen GL_TEXTURE_GEN_S See glTexGen GL_TEXTURE_GEN_T See glTexGen GL_VERTEX_ARRAY See glVertexPointer
The gllsEnabled function returns GL_TRUE if cap is an enabled capability and returns GL_FALSE otherwise.
If an error is generated, glIsEnabled returns zero.
The following are the error codes generated and their conditions.
| Error code | Condition |
|---|---|
| GL_INVALID_ENUM | cap was not an accepted value. |
| GL_INVALID_OPERATION | glIsEnabled was called between a call to glBegin and the corresponding call to glEnd. |
** Windows NT/2000:** Requires Windows NT 3.5 or later.
** Windows 95/98:** Requires Windows 95 or later. Available as a redistributable for Windows 95.
** Header:** Declared in Gl.h.
** Library:** Use Opengl32.lib.