glEnable man page on MacOSX
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GLENABLE(3G) OpenGL 3.3 GLENABLE(3G)
NAME
glEnable - 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.
C SPECIFICATION
void glEnablei(GLenum cap, GLuint index);
PARAMETERS
cap
Specifies a symbolic constant indicating a GL capability.
index
Specifies the index of the swtich to enable.
C SPECIFICATION
void glDisablei(GLenum cap, GLuint index);
PARAMETERS
cap
Specifies a symbolic constant indicating a GL capability.
index
Specifies the index of the swtich to disable.
DESCRIPTION
glEnable and glDisable() enable and disable various capabilities. Use
glIsEnabled() or glGet() to determine the current setting of any
capability. The initial value for each capability with the exception of
GL_DITHER and GL_MULTISAMPLE is GL_FALSE. The initial value for
GL_DITHER and GL_MULTISAMPLE is GL_TRUE.
Both glEnable and glDisable() take a single argument, cap, which can
assume one of the following values:
Some of the GL's capabilities are indicated. glEnablei and glDisablei
enable and disable indexed capabilities.
GL_BLEND
If enabled, blend the computed fragment color values with the
values in the color buffers. See glBlendFunc().
GL_CLIP_DISTANCEi
If enabled, clip geometry against user-defined half space i.
GL_COLOR_LOGIC_OP
If enabled, apply the currently selected logical operation to the
computed fragment color and color buffer values. See glLogicOp().
GL_CULL_FACE
If enabled, cull polygons based on their winding in window
coordinates. See glCullFace().
GL_DEPTH_CLAMP
If enabled, the
-wc≤zc≤wc plane equation is ignored by view volume clipping
(effectively, there is no near or far plane clipping). See
glDepthRange().
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_LINE_SMOOTH
If enabled, draw lines with correct filtering. Otherwise, draw
aliased lines. See glLineWidth().
GL_MULTISAMPLE
If enabled, use multiple fragment samples in computing the final
color of a pixel. See glSampleCoverage().
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 values 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 filtering. Otherwise, draw
aliased polygons. For correct antialiased polygons, an alpha buffer
is needed and the polygons must be sorted front to back.
GL_PRIMITIVE_RESTART
Enables primitive restarting. If enabled, any one of the draw
commands which transfers a set of generic attribute array elements
to the GL will restart the primitive when the index of the vertex
is equal to the primitive restart index. See
glPrimitiveRestartIndex().
GL_SAMPLE_ALPHA_TO_COVERAGE
If enabled, compute a temporary coverage value where each bit is
determined by the alpha value at the corresponding sample location.
The temporary coverage value is then ANDed with the fragment
coverage value.
GL_SAMPLE_ALPHA_TO_ONE
If enabled, each sample alpha value is replaced by the maximum
representable alpha value.
GL_SAMPLE_COVERAGE
If enabled, the fragment's coverage is ANDed with the temporary
coverage value. If GL_SAMPLE_COVERAGE_INVERT is set to GL_TRUE,
invert the coverage value. See glSampleCoverage().
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 glStencilOp().
GL_TEXTURE_CUBE_MAP_SEAMLESS
If enabled, modifies the way sampling is performed on cube map
textures. See the spec for more information.
GL_PROGRAM_POINT_SIZE
If enabled and a vertex or geometry shader is active, then the
derived point size is taken from the (potentially clipped) shader
builtin gl_PointSize and clamped to the implementation-dependent
point size range.
ERRORS
GL_INVALID_ENUM is generated if cap is not one of the values listed
previously.
GL_INVALID_VALUE is generated by glEnablei and glDisablei if index is
greater than or equal to the number of indexed capabilities for cap.
NOTES
GL_PRIMITIVE_RESTART is available only if the GL version is 3.1 or
greater.
GL_TEXTURE_CUBE_MAP_SEAMLESS is available only if the GL version is 3.2
or greater.
Any token accepted by glEnable or glDisable is also accepted by
glEnablei and glDisablei, but if the capability is not indexed, the
maximum value that index may take is zero.
In general, passing an indexed capability to glEnable or glDisable will
enable or disable that capability for all indices, resepectively.
ASSOCIATED GETS
glIsEnabled()
glGet()
SEE ALSO
glActiveTexture(), glBlendFunc(), glCullFace(), glDepthFunc(),
glDepthRange(), glGet(), glIsEnabled(), glLineWidth(), glLogicOp(),
glPointSize(), glPolygonMode(), glPolygonOffset(), glSampleCoverage(),
glScissor(), glStencilFunc(), glStencilOp(), glTexImage1D(),
glTexImage2D(), glTexImage3D()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010 Khronos
Group. This document is licensed under the SGI Free Software B License.
For details, see http://oss.sgi.com/projects/FreeB/.
OpenGL 3.3 03/08/2011 GLENABLE(3G)
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