GLENABLE()GLENABLE()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 val‐
ues 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 logi‐
cal 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 glColorMa‐
terial.
GL_CULL_FACE If enabled, cull polygons based on their wind‐
ing 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_INDEX_LOGIC_OP If enabled, apply the currently selected logi‐
cal 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 filtering.
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, glE‐
valMesh1, and glEvalPoint1 generate RGBA val‐
ues. See glMap1.
GL_MAP1_INDEX If enabled, calls to glEvalCoord1, glE‐
valMesh1, and glEvalPoint1 generate color
indices. See glMap1.
GL_MAP1_NORMAL If enabled, calls to glEvalCoord1, glE‐
valMesh1, and glEvalPoint1 generate normals.
See glMap1.
GL_MAP1_TEXTURE_COORD_1 If enabled, calls to glEvalCoord1, glE‐
valMesh1, and glEvalPoint1 generate s texture
coordinates. See glMap1.
GL_MAP1_TEXTURE_COORD_2 If enabled, calls to glEvalCoord1, glE‐
valMesh1, and glEvalPoint1 generate s and t
texture coordinates. See glMap1.
GL_MAP1_TEXTURE_COORD_3 If enabled, calls to glEvalCoord1, glE‐
valMesh1, and glEvalPoint1 generate s, t, and
r texture coordinates. See glMap1.
GL_MAP1_TEXTURE_COORD_4 If enabled, calls to glEvalCoord1, glE‐
valMesh1, and glEvalPoint1 generate s, t, r,
and q texture coordinates. See glMap1.
GL_MAP1_VERTEX_3 If enabled, calls to glEvalCoord1, glE‐
valMesh1, and glEvalPoint1 generate x, y, and
z vertex coordinates. See glMap1.
GL_MAP1_VERTEX_4 If enabled, calls to glEvalCoord1, glE‐
valMesh1, and glEvalPoint1 generate homoge‐
neous x, y, z, and w vertex coordinates. See
glMap1.
GL_MAP2_COLOR_4 If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate RGBA val‐
ues. See glMap2.
GL_MAP2_INDEX If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate color
indices. See glMap2.
GL_MAP2_NORMAL If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate normals.
See glMap2.
GL_MAP2_TEXTURE_COORD_1 If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate s texture
coordinates. See glMap2.
GL_MAP2_TEXTURE_COORD_2 If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate s and t
texture coordinates. See glMap2.
GL_MAP2_TEXTURE_COORD_3 If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate s, t, and
r texture coordinates. See glMap2.
GL_MAP2_TEXTURE_COORD_4 If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate s, t, r,
and q texture coordinates. See glMap2.
GL_MAP2_VERTEX_3 If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate x, y, and
z vertex coordinates. See glMap2.
GL_MAP2_VERTEX_4 If enabled, calls to glEvalCoord2, glE‐
valMesh2, and glEvalPoint2 generate homoge‐
neous x, y, z, and w vertex coordinates. See
glMap2.
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 filtering.
Otherwise, draw aliased points. See glPoint‐
Size.
GL_POLYGON_OFFSET_FILL If enabled, and if the polygon is rendered in
GL_FILL mode, an offset is added to depth val‐
ues 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 val‐
ues 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 values
of a polygon's fragments before the depth com‐
parison is performed, if the polygon is ren‐
dered 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 glPoly‐
gonStipple.
GL_SCISSOR_TEST If enabled, discard fragments that are outside
the scissor rectangle. See glScissor.
GL_STENCIL_TEST If enabled, do stencil testing and update the
stencil buffer. See glStencilFunc and glSten‐
cilOp.
GL_TEXTURE_1D If enabled, one-dimensional texturing is per‐
formed (unless two-dimensional texturing is
also enabled). See glTexImage1D.
GL_TEXTURE_2D If enabled, two-dimensional texturing is per‐
formed. See glTexImage2D.
GL_TEXTURE_GEN_Q If enabled, the q texture coordinate is com‐
puted using the texture generation function
defined with glTexGen. Otherwise, the current
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 current
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 current
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 current
t texture coordinate is used. See glTexGen.
NOTES
GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, GL_POLYGON_OFF‐
SET_POINT, GL_COLOR_LOGIC_OP, and GL_INDEX_LOGIC_OP are only available
if the GL version is 1.1 or greater.
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
glAlphaFunc, glBlendFunc, glClipPlane, glColorMaterial, glCullFace,
glDepthFunc, glDepthRange, glEnableClientState, glFog, glGet, glIsEn‐
abled, glLight, glLightModel, glLineWidth, glLineStipple, glLogicOp,
glMap1, glMap2, glMaterial, glNormal, glPointSize, glPolygonMode,
glPolygonOffset,
glPolygonStipple, glScissor, glStencilFunc, glStencilOp, glTexGen,
glTexImage1D, glTexImage2D
GLENABLE()
