glEnable man page on Oracle
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GLENABLE(3G) OpenGL Manual 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 indexed. 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_DEBUG_OUTPUT
If enabled, debug messages are produced by a debug context. When
disabled, the debug message log is silenced. Note that in a
non-debug context, very few, if any messages might be produced,
even when GL_DEBUG_OUTPUT is enabled.
GL_DEBUG_OUTPUT_SYNCHRONOUS
If enabled, debug messages are produced synchronously by a debug
context. If disabled, debug messages may be produced
asynchronously. In particular, they may be delayed relative to the
execution of GL commands, and the debug callback function may be
called from a thread other than that in which the commands are
executed. See glDebugMessageCallback().
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_FRAMEBUFFER_SRGB
If enabled and the value of
GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING for the framebuffer
attachment corresponding to the destination buffer is GL_SRGB, the
R, G, and B destination color values (after conversion from
fixed-point to floating-point) are considered to be encoded for the
sRGB color space and hence are linearized prior to their use in
blending.
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_PRIMITIVE_RESTART_FIXED_INDEX
Enables primitive restarting with a fixed index. 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 fixed primitive index for the
specified index type. The fixed index is equal to 2n−1 where n is
equal to 8 for GL_UNSIGNED_BYTE, 16 for GL_UNSIGNED_SHORT and 32
for GL_UNSIGNED_INT.
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_SAMPLE_SHADING
If enabled, the active fragment shader is run once for each covered
sample, or at fraction of this rate as determined by the current
value of GL_MIN_SAMPLE_SHADING_VALUE. See glMinSampleShading().
GL_SAMPLE_MASK
If enabled, the sample coverage mask generated for a fragment
during rasterization will be ANDed with the value of
GL_SAMPLE_MASK_VALUE before shading occurs. See glSampleMaski().
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, cubemap textures are sampled such that when linearly
sampling from the border between two adjacent faces, texels from
both faces are used to generate the final sample value. When
disabled, texels from only a single face are used to construct the
final sample value.
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.
GL_PRIMITIVE_RESTART_FIXED_INDEX is available only if the GL version is
4.3 or greater.
GL_DEBUG_OUTPUT and GL_DEBUG_OUTPUT_SYNCHRONOUS are available only if
the GL version is 4.3 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 © 2010-2011
Khronos Group. This document is licensed under the SGI Free Software B
License. For details, see http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 04/29/2014 GLENABLE(3G)
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