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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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