glEnable
GLENABLE(3G) GLENABLE(3G)
NAME
glEnable, glDisable - enable or disable server-side GL capabilities
C SPECIFICATION
void glEnable( GLenum cap )
PARAMETERS
cap Specifies a symbolic constant indicating a GL capability.
C SPECIFICATION
void glDisable( GLenum cap )
PARAMETERS
cap Specifies a symbolic constant indicating a GL capability.
DESCRIPTION
glEnable and glDisable enable and disable various capabilities. Use
glIsEnabled or glGet to determine the current setting of any capabil-
ity. The initial value for each capability with the exception of
GL_DITHER is GL_FALSE. The initial value for GL_DITHER is GL_TRUE.
Both glEnable and glDisable take a single argument, cap, which can
assume one of the following values:
GL_ALPHA_TEST If enabled, do alpha testing. See
glAlphaFunc.
GL_AUTO_NORMAL If enabled, generate normal vectors when
either GL_MAP2_VERTEX_3 or GL_MAP2_VERTEX_4
is used to generate vertices. See glMap2.
GL_BLEND If enabled, blend the incoming RGBA color
values with the values in the color buffers.
See glBlendFunc.
GL_CLIP_PLANEi If enabled, clip geometry against user-
defined clipping plane i. See glClipPlane.
GL_COLOR_LOGIC_OP If enabled, apply the currently selected log-
ical operation to the incoming RGBA color and
color buffer values. See glLogicOp.
GL_COLOR_MATERIAL If enabled, have one or more material parame-
ters track the current color. See
glColorMaterial.
GL_COLOR_TABLE If enabled, preform a color table lookup on
the incoming RGBA color values. See
glColorTable.
GL_CONVOLUTION_1D If enabled, perform a 1D convolution opera-
tion on incoming RGBA color values. See
glConvolutionFilter1D.
GL_CONVOLUTION_2D If enabled, perform a 2D convolution opera-
tion on incoming RGBA color values. See
glConvolutionFilter2D.
GL_CULL_FACE If enabled, cull polygons based on their
winding in window coordinates. See
glCullFace.
GL_DEPTH_TEST If enabled, do depth comparisons and update
the depth buffer. Note that even if the depth
buffer exists and the depth mask is non-zero,
the depth buffer is not updated if the depth
test is disabled. See glDepthFunc and
glDepthRange.
GL_DITHER If enabled, dither color components or
indices before they are written to the color
buffer.
GL_FOG If enabled, blend a fog color into the post-
texturing color. See glFog.
GL_HISTOGRAM If enabled, histogram incoming RGBA color
values. See glHistogram.
GL_INDEX_LOGIC_OP If enabled, apply the currently selected log-
ical operation to the incoming index and
color buffer indices. See
glLogicOp.
GL_LIGHTi If enabled, include light i in the evaluation
of the lighting equation. See glLightModel
and glLight.
GL_LIGHTING If enabled, use the current lighting parame-
ters to compute the vertex color or index.
Otherwise, simply associate the current color
or index with each vertex. See
glMaterial, glLightModel, and glLight.
GL_LINE_SMOOTH If enabled, draw lines with correct filter-
ing. Otherwise, draw aliased lines. See
glLineWidth.
GL_LINE_STIPPLE If enabled, use the current line stipple pat-
tern when drawing lines. See glLineStipple.
GL_MAP1_COLOR_4 If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate RGBA
values. See glMap1.
GL_MAP1_INDEX If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate color
indices. See glMap1.
GL_MAP1_NORMAL If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate nor-
mals. See glMap1.
GL_MAP1_TEXTURE_COORD_1 If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate s tex-
ture coordinates. See glMap1.
GL_MAP1_TEXTURE_COORD_2 If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate s and
t texture coordinates. See glMap1.
GL_MAP1_TEXTURE_COORD_3 If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate s, t,
and r texture coordinates. See glMap1.
GL_MAP1_TEXTURE_COORD_4 If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate s, t,
r, and q texture coordinates. See glMap1.
GL_MAP1_VERTEX_3 If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate x, y,
and z vertex coordinates. See glMap1.
GL_MAP1_VERTEX_4 If enabled, calls to glEvalCoord1,
glEvalMesh1, and glEvalPoint1 generate homo-
geneous x, y, z, and w vertex coordinates.
See glMap1.
GL_MAP2_COLOR_4 If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate RGBA
values. See glMap2.
GL_MAP2_INDEX If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate color
indices. See glMap2.
GL_MAP2_NORMAL If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate nor-
mals. See glMap2.
GL_MAP2_TEXTURE_COORD_1 If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate s tex-
ture coordinates. See glMap2.
GL_MAP2_TEXTURE_COORD_2 If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate s and
t texture coordinates. See glMap2.
GL_MAP2_TEXTURE_COORD_3 If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate s, t,
and r texture coordinates. See glMap2.
GL_MAP2_TEXTURE_COORD_4 If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate s, t,
r, and q texture coordinates. See glMap2.
GL_MAP2_VERTEX_3 If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate x, y,
and z vertex coordinates. See glMap2.
GL_MAP2_VERTEX_4 If enabled, calls to glEvalCoord2,
glEvalMesh2, and glEvalPoint2 generate homo-
geneous x, y, z, and w vertex coordinates.
See glMap2.
GL_MINMAX If enabled, compute the minimum and maximum
values of incoming RGBA color values. See
glMinmax.
GL_NORMALIZE If enabled, normal vectors specified with
glNormal are scaled to unit length after
transformation. See glNormal.
GL_POINT_SMOOTH If enabled, draw points with proper filter-
ing. Otherwise, draw aliased points. See
glPointSize.
GL_POLYGON_OFFSET_FILL If enabled, and if the polygon is rendered in
GL_FILL mode, an offset is added to depth
values of a polygon’s fragments before the
depth comparison is performed. See
glPolygonOffset.
GL_POLYGON_OFFSET_LINE If enabled, and if the polygon is rendered in
GL_LINE mode, an offset is added to depth
values of a polygon’s fragments before the
depth comparison is performed. See
glPolygonOffset.
GL_POLYGON_OFFSET_POINT If enabled, an offset is added to depth val-
ues of a polygon’s fragments before the depth
comparison is performed, if the polygon is
rendered in GL_POINT mode. See
glPolygonOffset.
GL_POLYGON_SMOOTH If enabled, draw polygons with proper filter-
ing. Otherwise, draw aliased polygons. For
correct anti-aliased polygons, an alpha
buffer is needed and the polygons must be
sorted front to back.
GL_POLYGON_STIPPLE If enabled, use the current polygon stipple
pattern when rendering polygons. See
glPolygonStipple.
GL_POST_COLOR_MATRIX_COLOR_TABLE
If enabled, preform a color table lookup on
RGBA color values after color matrix trans-
formation. See glColorTable.
GL_POST_CONVOLUTION_COLOR_TABLE
If enabled, preform a color table lookup on
RGBA color values after convolution. See
glColorTable.
GL_RESCALE_NORMAL If enabled, normal vectors specified with
glNormal are scaled to unit length after
transformation. See glNormal.
GL_SEPARABLE_2D If enabled, perform a two-dimensional convo-
lution operation using a separable convolu-
tion filter on incoming RGBA color values.
See glSeparableFilter2D.
GL_SCISSOR_TEST If enabled, discard fragments that are out-
side the scissor rectangle. See glScissor.
GL_STENCIL_TEST If enabled, do stencil testing and update the
stencil buffer. See glStencilFunc and
glStencilOp.
GL_TEXTURE_1D If enabled, one-dimensional texturing is per-
formed (unless two- or three-dimensional tex-
turing is also enabled). See glTexImage1D.
GL_TEXTURE_2D If enabled, two-dimensional texturing is per-
formed (unless three-dimensional texturing is
also enabled). See glTexImage2D.
GL_TEXTURE_3D If enabled, three-dimensional texturing is
performed. See glTexImage3D.
GL_TEXTURE_GEN_Q If enabled, the q texture coordinate is com-
puted using the texture generation function
defined with glTexGen. Otherwise, the cur-
rent q texture coordinate is used. See
glTexGen.
GL_TEXTURE_GEN_R If enabled, the r texture coordinate is com-
puted using the texture generation function
defined with glTexGen. Otherwise, the cur-
rent r texture coordinate is used. See
glTexGen.
GL_TEXTURE_GEN_S If enabled, the s texture coordinate is com-
puted using the texture generation function
defined with glTexGen. Otherwise, the cur-
rent s texture coordinate is used. See
glTexGen.
GL_TEXTURE_GEN_T If enabled, the t texture coordinate is com-
puted using the texture generation function
defined with glTexGen. Otherwise, the cur-
rent t texture coordinate is used. See
glTexGen.
NOTES
GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE,
GL_POLYGON_OFFSET_POINT, GL_COLOR_LOGIC_OP, and GL_INDEX_LOGIC_OP 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 ver-
sion 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 from glGet with an argument of
GL_EXTENSIONS.
If GL_ARB_multitexture is supported, GL_TEXTURE_1D, GL_TEXTURE_2D,
GL_TEXTURE_3D, GL_TEXTURE_GEN_S, GL_TEXTURE_GEN_T, GL_TEXTURE_GEN_R,
and GL_TEXTURE_GEN_Q enable or disable the respective state for the
active texture unit specified with glActiveTextureARB.
ERRORS
GL_INVALID_ENUM is generated if cap is not one of the values listed
previously.
GL_INVALID_OPERATION is generated if glEnable or glDisable is executed
between the execution of glBegin and the corresponding execution of
glEnd.
SEE ALSO
glActiveTextureARB(3G), glAlphaFunc(3G), glBlendFunc(3G),
glClipPlane(3G), glColorMaterial(3G), glCullFace(3G), glDepthFunc(3G),
glDepthRange(3G), glEnableClientState(3G), glFog(3G), glGet(3G),
glIsEnabled(3G), glLight(3G), glLightModel(3G), glLineWidth(3G),
glLineStipple(3G), glLogicOp(3G), glMap1(3G), glMap2(3G),
glMaterial(3G), glNormal(3G), glPointSize(3G), glPolygonMode(3G),
glPolygonOffset(3G), glPolygonStipple(3G), glScissor(3G),
glStencilFunc(3G), glStencilOp(3G), glTexGen(3G), glTexImage1D(3G),
glTexImage2D(3G), glTexImage3D(3G)
GLENABLE(3G)
