GLENABLE(3gl)GLENABLE(3gl)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_COLOR_SUM_ARB If enabled, and a vertex shader is active,
the primary and secondary colors are summed.
If a vertex shader is not active this value is
ignored. See glSecondaryColor.
GL_CONVOLUTION_1D_EXT If enabled, the 1-dimensional convolution fil‐
ter is applied to image passed to glTexIm‐
age1D, and to 1-dimensional textures queried
by glGetTexImage. See glConvolutionFil‐
ter1DEXT.
GL_CONVOLUTION_2D_EXT If enabled, the 2-dimensional convolution fil‐
ter is applied to 2D images passed to glDraw‐
Pixels, glCopyPixels, glReadPixels, glTexIm‐
age2D, glTexSubImage2DEXT, glCopyTexIm‐
age2DEXT, glCopyTexSubImage2DEXT, and to
2-dimensional images queried by glGetTexImage.
See glConvolutionFilter2DEXT.
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_FRAGMENT_PROGRAM_ARB If enabled, the current fragment program is
exectued when performing fragment processing
instead of the fixed function fragment pro‐
cessing. See glBindProgramARB and glProgram‐
StringARB.
GL_GLOBAL_ALPHA_SUN If enabled, multiple a global alpha factor
into the pretexturing color. See glGlobalAl‐
phaFactorSUN.
GL_HISTOGRAM_EXT If enabled, do a histogram operation on the
incoming RGBA values in the pixel transfer
pipeline. See glHistogramEXT.
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_MINMAX_EXT If enabled, do a minmax operation on the
incoming RGBA values in the pixel transfer
pipeline. See glMinmaxEXT.
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_EXT 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 glPolygonOffse‐
tEXT.
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_POST_CONVOLUTION_COLOR_TABLE_SGI
If enabled, pass output from convolution oper‐
ation through post convolution color table.
See glColorTableSGI.
GL_SCISSOR_TEST If enabled, discard fragments that are outside
the scissor rectangle. See glScissor.
GL_SEPARABLE_2D_EXT If enabled, the separable 2-dimensional convo‐
lution filter is applied to 2D images passed
to glDrawPixels, glCopyPixels, glReadPixels,
glTexImage2D, glTexSubImage2DEXT, glCopyTexIm‐
age2DEXT, glCopyTexSubImage2DEXT, and to
2-dimensional images queried by glGetTexImage.
See glSeparableFilter2DEXT.
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_CUBE_MAP If enabled, cube-mapped 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.
GL_MULTISAMPLE_ARB If enabled, draw primitives with multisample
rasterization. Otherwise, draw primitives
with single rasterization. Multisample raster‐
ization cannot be enabled unless GL_SAM‐
PLE_BUFFERS_ARB is 1.
GL_SAMPLE_ALPHA_TO_COVERAGE_ARB
If enabled, the fragment alpha value is used
to generate a temporary coverage value which
is ANDed with the coverage value. Otherwise
the fragment coverage value is unchanged.
GL_SAMPLE_ALPHA_TO_ONE_ARB
If enabled, fragment alpha is replaced by the
maximum representable alpha value. Otherwise,
fragment alpha value is not changed.
GL_SAMPLE_COVERAGE_ARB If enabled, the fragment coverage is ANDed
with a temporary coverage generated using
GL_SAMPLE_COVERAGE_VALUE_ARB and GL_SAM‐
PLE_COVERAGE_INVERT_ARB, defined by the func‐
tion glSampleCoverageARB.
GL_VERTEX_PROGRAM_ARB If enabled, the current vertex program is
exectued when performing vertex processing
instead of the fixed function vertex process‐
ing. See glBindProgramARB and glProgram‐
StringARB.
GL_VERTEX_PROGRAM_POINT_SIZE_ARB
If enabled, and a vertex shader is active,
the point size is taken from the vertex
shader's point size result. See glBindProgra‐
mARB and glProgramStringARB.
GL_VERTEX_PROGRAM_TWO_SIDE_ARB
If enabled, and a vertex shader is active the
color is selected between the front and back
colors otherwise the vertex shader always
selectes the front color. See glBindProgra‐
mARB and glProgramStringARB.
GL_VIDEO_RESIZE_COMPENSATION_SUN
If enabled, the line widths, point sizes and
pixel operations will be scaled internally
with the resize factor to approximately com‐
pensate for video resizing; otherwise, no
internal scaling will be applied. The default
for video size compensation is enabled.
GL_TEXTURE_TARGET_SUN If enabled, texture downloads will be target‐
ted to specified pipelines in multi-pipeline
frame buffers(such as XVR-4000). Applications
can specify which pipelines to target using
glSetTextureTargetiSUN. Also see glSetTex‐
tureTargetModeSUN.
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.
GL_VIDEO_RESIZE_COMPENSATION_SUN is only available if the GL implemen‐
tation supports GLX_SUN_video_resize extension.
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, glColorTa‐
bleSGI, glConvolutionFilter1DEXT, glConvolutionFilter2DEXT, glCullFace,
glDepthFunc, glDepthRange, glEnableClientState, glFog, glHistogramEXT,
glGet, glIsEnabled, glLight, glLightModel, glLineWidth, glLineStipple,
glLogicOp, glMap1, glMap2, glMaterial, glMinmaxEXT, glNormal, glPoint‐
Size, glPolygonMode, glPolygonOffset, glPolygonOffsetEXT,
glPolygonStipple, glScissor, glSeparableFilter2DEXT, glStencilFunc,
glStencilOp, glTexGen, glTexImage1D, glTexImage2D, glGlobalAlphaFactor‐
SUN, glSampleCoverageARB, glXVideoResizeSUN, glXGetVideoResizeSUN.
01 June 01 GLENABLE(3gl)