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541 lines
26 KiB
XML
541 lines
26 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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<refentryinfo>
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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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<copyright>
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<year>2011-2013</year>
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<holder>Khronos Group</holder>
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</copyright>
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</refentryinfo>
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<refmeta>
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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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<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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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glEnablei</function></funcdef>
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<paramdef>GLenum <parameter>cap</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glDisablei</function></funcdef>
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<paramdef>GLenum <parameter>cap</parameter></paramdef>
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<paramdef>GLuint <parameter>index</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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<varlistentry>
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<term><parameter>index</parameter></term>
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<listitem>
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<para>
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Specifies the index of the switch to disable (for
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<function>glEnablei</function> and
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<function>glDisablei</function> only).
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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 <function>glDisable</function>
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enable and disable various capabilities. Use
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<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>
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or
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
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to determine the current setting of any capability. The initial
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value for each capability with the exception of
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<constant>GL_DITHER</constant> and
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<constant>GL_MULTISAMPLE</constant> is
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<constant>GL_FALSE</constant>. The initial value for
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<constant>GL_DITHER</constant> and
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<constant>GL_MULTISAMPLE</constant> is
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<constant>GL_TRUE</constant>.
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</para>
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<para>
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Both <function>glEnable</function> and <function>glDisable</function> 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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<para>
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Some of the GL's capabilities are indexed. <function>glEnablei</function> and <function>glDisablei</function> enable and disable
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indexed capabilities.
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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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</para>
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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_CLIP_DISTANCE</constant><emphasis>i</emphasis></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled, clip geometry against user-defined half space <emphasis>i</emphasis>.
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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_COLOR_LOGIC_OP</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled,
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apply the currently selected logical operation to the computed fragment
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color and color buffer values. See <citerefentry><refentrytitle>glLogicOp</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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</para>
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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_DEBUG_OUTPUT</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled, debug messages are produced by a debug context. When disabled,
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the debug message log is silenced. Note that in a non-debug context, very
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few, if any messages might be produced, even when <constant>GL_DEBUG_OUTPUT</constant>
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is enabled.
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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_DEBUG_OUTPUT_SYNCHRONOUS</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled, debug messages are produced synchronously by a debug context. If disabled,
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debug messages may be produced asynchronously. In particular, they may be delayed relative
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to the execution of GL commands, and the debug callback function may be called from
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a thread other than that in which the commands are executed.
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See <citerefentry><refentrytitle>glDebugMessageCallback</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_CLAMP</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled,
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the
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<!-- - wc <= zc <= wc -->
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<inlineequation><mml:math>
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<mml:mo>-</mml:mo><mml:msub><mml:mi>w</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo>≤</mml:mo><mml:msub><mml:mi>z</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo>≤</mml:mo><mml:msub><mml:mi>w</mml:mi><mml:mi>c</mml:mi></mml:msub>
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</mml:math></inlineequation>
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plane equation is ignored by view volume clipping (effectively, there is no near or
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far plane clipping).
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See <citerefentry><refentrytitle>glDepthRange</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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</para>
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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>glDepthRange</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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</para>
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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_FRAMEBUFFER_SRGB</constant> </term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled
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and the value of <constant>GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING</constant> for the
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framebuffer attachment corresponding to the destination buffer is <constant>GL_SRGB</constant>,
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the R, G, and B destination color values (after conversion from fixed-point to floating-point)
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are considered to be encoded for the sRGB color space and hence are linearized prior to
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their use in blending.
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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_LINE_SMOOTH</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled,
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draw lines with correct filtering.
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Otherwise,
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draw aliased lines.
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See <citerefentry><refentrytitle>glLineWidth</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_MULTISAMPLE</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled,
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use multiple fragment samples in computing the final color of a pixel.
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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_POLYGON_OFFSET_FILL</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled, and if the polygon is rendered in
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<constant>GL_FILL</constant> mode, an offset is added to depth values of a polygon's
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fragments before the depth comparison is performed.
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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_POLYGON_OFFSET_LINE</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled, and if the polygon is rendered in
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<constant>GL_LINE</constant> mode, an offset is added to depth values of a polygon's
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fragments before the depth comparison is performed.
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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_POLYGON_OFFSET_POINT</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled, an offset is added to depth values of a polygon's fragments
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before the depth comparison is performed, if the polygon is rendered in
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<constant>GL_POINT</constant> mode. 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_POLYGON_SMOOTH</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled, draw polygons with proper filtering.
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Otherwise, draw aliased polygons. For correct antialiased polygons,
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an alpha buffer is needed and the polygons must be sorted front to
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back.
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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_PRIMITIVE_RESTART</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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Enables primitive restarting. If enabled, any one of the draw commands
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which transfers a set of generic attribute array elements to the GL will restart
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the primitive when the index of the vertex is equal to the primitive restart index.
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See <citerefentry><refentrytitle>glPrimitiveRestartIndex</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_PRIMITIVE_RESTART_FIXED_INDEX</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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Enables primitive restarting with a fixed index. If enabled, any one of the
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draw commands which transfers a set of generic attribute array elements to the GL will
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restart the primitive when the index of the vertex is equal to the fixed primitive
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index for the specified index type. The fixed index is equal to
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<inlineequation><mml:math><mml:msup><mml:mn>2</mml:mn><mml:mi>n</mml:mi></mml:msup><mml:mo>−</mml:mo><mml:mn>1</mml:mn></mml:math></inlineequation>
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where <emphasis>n</emphasis> is equal to 8 for <constant>GL_UNSIGNED_BYTE</constant>,
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16 for <constant>GL_UNSIGNED_SHORT</constant> and 32 for <constant>GL_UNSIGNED_INT</constant>.
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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_RASTERIZER_DISCARD</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled,
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primitives are discarded after the optional transform feedback stage,
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but before rasterization. Furthermore, when enabled, <citerefentry><refentrytitle>glClear</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glClearBufferData</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glClearBufferSubData</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glClearTexImage</refentrytitle></citerefentry>, and
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<citerefentry><refentrytitle>glClearTexSubImage</refentrytitle></citerefentry> are ignored.
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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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</para>
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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_ALPHA_TO_ONE</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled,
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each sample alpha value is replaced by the maximum representable alpha 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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</para>
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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_SAMPLE_SHADING</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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If enabled, the active fragment shader is run once for each covered sample, or at
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fraction of this rate as determined by the current value of <constant>GL_MIN_SAMPLE_SHADING_VALUE</constant>.
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See <citerefentry><refentrytitle>glMinSampleShading</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_MASK</constant></term>
|
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<listitem>
|
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<para>
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</para>
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<para>
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If enabled, the sample coverage mask generated for a fragment during rasterization
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will be ANDed with the value of <constant>GL_SAMPLE_MASK_VALUE</constant> before
|
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shading occurs.
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|
See <citerefentry><refentrytitle>glSampleMaski</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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</para>
|
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<para>
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If enabled,
|
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discard fragments that are outside the scissor rectangle.
|
|
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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</para>
|
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<para>
|
|
If enabled,
|
|
do stencil testing and update the stencil buffer.
|
|
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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|
<varlistentry>
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|
<term><constant>GL_TEXTURE_CUBE_MAP_SEAMLESS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
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.
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|
</para>
|
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</listitem>
|
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</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PROGRAM_POINT_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
If enabled
|
|
and a vertex or geometry shader is active, then the derived point size is taken from the (potentially clipped) shader builtin
|
|
<constant>gl_PointSize</constant> and clamped to the implementation-dependent point size range.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>cap</parameter> is not one of the values
|
|
listed previously.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated by <function>glEnablei</function> and <function>glDisablei</function>
|
|
if <parameter>index</parameter> is greater than or equal to the number of indexed capabilities for <parameter>cap</parameter>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
<constant>GL_PRIMITIVE_RESTART</constant> is available only if the GL version is 3.1 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_TEXTURE_CUBE_MAP_SEAMLESS</constant> is available only if the GL version is 3.2 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_PRIMITIVE_RESTART_FIXED_INDEX</constant> is available only if the GL version is 4.3 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_DEBUG_OUTPUT</constant> and <constant>GL_DEBUG_OUTPUT_SYNCHRONOUS</constant> are available only if the GL version is 4.3 or greater.
|
|
</para>
|
|
<para>
|
|
Any token accepted by <function>glEnable</function> or <function>glDisable</function> is also accepted by
|
|
<function>glEnablei</function> and <function>glDisablei</function>, but if the capability is not indexed,
|
|
the maximum value that <parameter>index</parameter> may take is zero.
|
|
</para>
|
|
<para>
|
|
In general, passing an indexed capability to <function>glEnable</function> or <function>glDisable</function>
|
|
will enable or disable that capability for all indices, resepectively.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glPointSize</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 1991-2006 Silicon Graphics, Inc.
|
|
Copyright <trademark class="copyright"></trademark> 2011-2013 Khronos Group.
|
|
This document is licensed under the SGI
|
|
Free Software B License. For details, see
|
|
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|