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210 lines
9.7 KiB
XML
210 lines
9.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glEnable">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glEnable</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glEnable</refname>
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<refpurpose>enable or disable server-side GL capabilities</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glEnable</function></funcdef>
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<paramdef>GLenum <parameter>cap</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>cap</parameter></term>
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<listitem>
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<para>
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Specifies a symbolic constant indicating a GL capability.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glDisable</function></funcdef>
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<paramdef>GLenum <parameter>cap</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters2"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>cap</parameter></term>
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<listitem>
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<para>
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Specifies a symbolic constant indicating a GL capability.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glEnable</function> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry> enable and disable various capabilities.
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Use <citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> or <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> to determine the current setting
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of any capability. The initial value for each capability with the
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exception of <constant>GL_DITHER</constant> is <constant>GL_FALSE</constant>. The initial value for
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<constant>GL_DITHER</constant> is <constant>GL_TRUE</constant>.
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</para>
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<para>
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Both <function>glEnable</function> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry> take a single argument, <parameter>cap</parameter>,
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which can assume one of the following values:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_BLEND</constant></term>
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<listitem>
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<para>
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If enabled,
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blend the computed fragment color values with the values in the color
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buffers. See <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_CULL_FACE</constant></term>
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<listitem>
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<para>
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If enabled,
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cull polygons based on their winding in window coordinates.
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See <citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_DEPTH_TEST</constant></term>
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<listitem>
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<para>
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If enabled,
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do depth comparisons and update the depth buffer. Note that even if
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the depth buffer exists and the depth mask is non-zero, the
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depth buffer is not updated if the depth test is disabled. See
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<citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry> and
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<citerefentry><refentrytitle>glDepthRangef</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_DITHER</constant> </term>
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<listitem>
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<para>
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If enabled,
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dither color components or indices before they are written to the
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color buffer.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_POLYGON_OFFSET_FILL</constant></term>
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<listitem>
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<para>
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If enabled, an offset is added to depth values of a polygon's
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fragments produced by rasterization.
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See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_SAMPLE_ALPHA_TO_COVERAGE</constant></term>
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<listitem>
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<para>
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If enabled,
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compute a temporary coverage value where each bit is determined by the
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alpha value at the corresponding sample location. The temporary coverage
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value is then ANDed with the fragment coverage value.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_SAMPLE_COVERAGE</constant></term>
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<listitem>
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<para>
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If enabled,
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the fragment's coverage is ANDed with the temporary coverage value. If
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<constant>GL_SAMPLE_COVERAGE_INVERT</constant> is set to <constant>GL_TRUE</constant>, invert the coverage
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value.
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See <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_SCISSOR_TEST</constant></term>
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<listitem>
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<para>
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If enabled,
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discard fragments that are outside the scissor rectangle.
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See <citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_STENCIL_TEST</constant></term>
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<listitem>
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<para>
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If enabled,
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do stencil testing and update the stencil buffer.
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See <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>cap</parameter> is not one of the values
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listed previously.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDepthRangef</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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