GLISENABLED() MachTen Programmer’s Manual GLISENABLED()

NAME
glIsEnabled - test whether a capability is enabled

C SPECIFICATION
GLboolean glIsEnabled( GLenum cap )

PARAMETERS
cap Specifies a symbolic constant indicating a GL capa-
bility.

DESCRIPTION
glIsEnabled returns GL_TRUE if cap is an enabled capabil-
ity and returns GL_FALSE otherwise. Initially all capa-
bilities except GL_DITHER are disabled; GL_DITHER is ini-
tially enabled.

The following capabilities are accepted for cap:

lb lb l l l. Constant See _

GL_ALPHA_TEST glAlphaFunc GL_AUTO_NORMAL glEvalCoord
GL_BLEND glBlendFunc, glLogicOp GL_CLIP_PLANEi glClip-
Plane GL_COLOR_ARRAY glColorPointer
GL_COLOR_LOGIC_OP glLogicOp GL_COLOR_MATERIAL glColor-
Material GL_CULL_FACE glCullFace GL_DEPTH_TEST glDepth-
Func, glDepthRange GL_DITHER glEnable
GL_EDGE_FLAG_ARRAY glEdgeFlagPointer GL_FOG glFog
GL_INDEX_ARRAY glIndexPointer GL_INDEX_LOGIC_OP glLogi-
cOp GL_LIGHTi glLightModel, glLight GL_LIGHTING glMate-
rial, 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 glNormal-
Pointer 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 glSten-
cilFunc, 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 exe-
cuted between the execution of glBegin and the correspond-
ing execution of glEnd.