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2963 lines
153 KiB
XML
2963 lines
153 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="glGet">
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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>2010-2013</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>glGet</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGet</refname>
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<refpurpose>return the value or values of a selected parameter</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>glGetBooleanv</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLboolean * <parameter>data</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>glGetDoublev</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLdouble * <parameter>data</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>glGetFloatv</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLfloat * <parameter>data</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>glGetIntegerv</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint * <parameter>data</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>glGetInteger64v</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint64 * <parameter>data</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>glGetBooleani_v</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLboolean * <parameter>data</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>glGetIntegeri_v</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLint * <parameter>data</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>glGetFloati_v</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLfloat * <parameter>data</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>glGetDoublei_v</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble * <parameter>data</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>glGetInteger64i_v</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLint64 * <parameter>data</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>pname</parameter></term>
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<listitem>
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<para>
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Specifies the parameter value to be returned
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for non-indexed versions of <function>glGet</function>.
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The symbolic constants in the list below are accepted.
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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>target</parameter></term>
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<listitem>
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<para>
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Specifies the parameter value to be returned
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for indexed versions of <function>glGet</function>.
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The symbolic constants in the list below are accepted.
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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 particular element being queried.
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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>data</parameter></term>
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<listitem>
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<para>
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Returns the value or values of the specified parameter.
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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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These commands return values for simple state variables in GL.
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<parameter>pname</parameter> is a symbolic constant indicating the state variable to be returned,
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and <parameter>data</parameter> is a pointer to an array of the indicated type in
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which to place the returned data.
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</para>
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<para>
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Type conversion is performed if <parameter>data</parameter> has a different type than
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the state variable value being requested.
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If <function>glGetBooleanv</function> is called,
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a floating-point (or integer) value is converted to <constant>GL_FALSE</constant> if
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and only if it is 0.0 (or 0).
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Otherwise,
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it is converted to <constant>GL_TRUE</constant>.
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If <function>glGetIntegerv</function> is called, boolean values are returned as
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<constant>GL_TRUE</constant> or <constant>GL_FALSE</constant>, and most floating-point values are
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rounded to the nearest integer value. Floating-point colors and
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normals, however, are returned with a linear mapping that maps 1.0 to
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the most positive representable integer value
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and
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<inlineequation><mml:math>
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<!-- eqn: -1.0: -->
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<mml:mn>-1.0</mml:mn>
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</mml:math></inlineequation>
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to the most negative representable integer value.
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If <function>glGetFloatv</function> or <function>glGetDoublev</function> is called,
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boolean values are returned as <constant>GL_TRUE</constant> or <constant>GL_FALSE</constant>,
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and integer values are converted to floating-point values.
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</para>
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<para>
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The following symbolic constants are accepted by <parameter>pname</parameter>:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_ACTIVE_TEXTURE</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns a single value indicating the active multitexture unit.
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The initial value is <constant>GL_TEXTURE0</constant>.
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See <citerefentry><refentrytitle>glActiveTexture</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_ALIASED_LINE_WIDTH_RANGE</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns a pair of values indicating the range of
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widths supported for aliased lines. 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_ARRAY_BUFFER_BINDING</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns a single value, the name of the buffer object
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currently bound to the target <constant>GL_ARRAY_BUFFER</constant>. If no buffer object
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is bound to this target, 0 is returned. The initial value is 0.
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See <citerefentry><refentrytitle>glBindBuffer</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_BLEND</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns a single boolean value indicating whether blending is
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enabled. The initial value is <constant>GL_FALSE</constant>.
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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_BLEND_COLOR</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns four values,
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the red, green, blue, and alpha values which are the components of
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the blend color.
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See <citerefentry><refentrytitle>glBlendColor</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_BLEND_DST_ALPHA</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the symbolic constant identifying the alpha destination blend
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function. The initial value is <constant>GL_ZERO</constant>.
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See <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glBlendFuncSeparate</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_BLEND_DST_RGB</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the symbolic constant identifying the RGB destination blend
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function. The initial value is <constant>GL_ZERO</constant>.
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See <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glBlendFuncSeparate</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_BLEND_EQUATION_RGB</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value, a symbolic constant indicating whether
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the RGB blend equation is <constant>GL_FUNC_ADD</constant>, <constant>GL_FUNC_SUBTRACT</constant>,
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<constant>GL_FUNC_REVERSE_SUBTRACT</constant>, <constant>GL_MIN</constant> or <constant>GL_MAX</constant>.
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See <citerefentry><refentrytitle>glBlendEquationSeparate</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_BLEND_EQUATION_ALPHA</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value, a symbolic constant indicating whether
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the Alpha blend equation is <constant>GL_FUNC_ADD</constant>, <constant>GL_FUNC_SUBTRACT</constant>,
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<constant>GL_FUNC_REVERSE_SUBTRACT</constant>, <constant>GL_MIN</constant> or <constant>GL_MAX</constant>.
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See <citerefentry><refentrytitle>glBlendEquationSeparate</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_BLEND_SRC_ALPHA</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the symbolic constant identifying the alpha source blend function. The initial
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value is <constant>GL_ONE</constant>.
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See <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glBlendFuncSeparate</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_BLEND_SRC_RGB</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the symbolic constant identifying the RGB source blend function. The initial
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value is <constant>GL_ONE</constant>.
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See <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glBlendFuncSeparate</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_COLOR_CLEAR_VALUE</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns four values:
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the red, green, blue, and alpha values used to clear the color buffers.
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Integer values,
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if requested,
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are linearly mapped from the internal floating-point representation such
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that 1.0 returns the most positive representable integer value,
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and
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<inlineequation><mml:math>
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<!-- eqn: -1.0: -->
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<mml:mn>-1.0</mml:mn>
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</mml:math></inlineequation>
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returns the most negative representable integer
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value. The initial value is (0, 0, 0, 0).
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See <citerefentry><refentrytitle>glClearColor</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_COLOR_LOGIC_OP</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns a single boolean value indicating whether a fragment's
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RGBA color values are merged into the framebuffer using a logical
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operation. The initial value is <constant>GL_FALSE</constant>.
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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_COLOR_WRITEMASK</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns four boolean values:
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the red, green, blue, and alpha write enables for the color
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buffers. The initial value is (<constant>GL_TRUE</constant>, <constant>GL_TRUE</constant>,
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<constant>GL_TRUE</constant>, <constant>GL_TRUE</constant>).
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See <citerefentry><refentrytitle>glColorMask</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_COMPRESSED_TEXTURE_FORMATS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns a list of symbolic
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constants of length <constant>GL_NUM_COMPRESSED_TEXTURE_FORMATS</constant>
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indicating which compressed texture formats are available.
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See <citerefentry><refentrytitle>glCompressedTexImage2D</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_MAX_COMPUTE_SHADER_STORAGE_BLOCKS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the maximum number of active shader storage blocks that may be accessed by a compute shader.
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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_MAX_COMBINED_SHADER_STORAGE_BLOCKS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the maximum total number of active shader storage blocks that may be accessed by all active shaders.
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</para>
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</listitem>
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</varlistentry>
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<!-- // ARB_compute_shader -->
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<varlistentry>
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<term><constant>GL_MAX_COMPUTE_UNIFORM_BLOCKS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the maximum number of uniform blocks per compute shader. The value must be at least 14.
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See <citerefentry><refentrytitle>glUniformBlockBinding</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_MAX_COMPUTE_TEXTURE_IMAGE_UNITS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value, the maximum supported texture image units that
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can be used to access texture maps from the compute shader. The value may be at least 16.
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See <citerefentry><refentrytitle>glActiveTexture</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_MAX_COMPUTE_UNIFORM_COMPONENTS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the maximum number of individual floating-point, integer, or boolean values that can be held
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in uniform variable storage for a compute shader. The value must be at least 1024.
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See <citerefentry><refentrytitle>glUniform</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_MAX_COMPUTE_ATOMIC_COUNTERS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns a single value, the maximum number of atomic counters available to compute shaders.
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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_MAX_COMPUTE_ATOMIC_COUNTER_BUFFERS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns a single value, the maximum number of atomic counter buffers that may be accessed by a compute shader.
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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_MAX_COMBINED_COMPUTE_UNIFORM_COMPONENTS</constant></term>
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<listitem>
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|
<para>
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<parameter>data</parameter> returns one value,
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the number of words for compute shader uniform variables in all uniform
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blocks (including default). The value must be at least 1.
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|
See <citerefentry><refentrytitle>glUniform</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_MAX_COMPUTE_WORK_GROUP_INVOCATIONS</constant></term>
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<listitem>
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<para>
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<parameter>data</parameter> returns one value,
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the number of invocations in a single local work group
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(i.e., the product of the three dimensions) that may
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be dispatched to a compute shader.
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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_MAX_COMPUTE_WORK_GROUP_COUNT</constant></term>
|
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<listitem>
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<para>
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Accepted by the indexed versions of <function>glGet</function>.
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<parameter>data</parameter> the maximum number of work
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groups that may be dispatched to a compute shader. Indices
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0, 1, and 2 correspond to the X, Y and Z dimensions, respectively.
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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_MAX_COMPUTE_WORK_GROUP_SIZE</constant></term>
|
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<listitem>
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<para>
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Accepted by the indexed versions of <function>glGet</function>.
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<parameter>data</parameter> the maximum size of a work
|
|
groups that may be used during compilation of a compute shader. Indices
|
|
0, 1, and 2 correspond to the X, Y and Z dimensions, respectively.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DISPATCH_INDIRECT_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
currently bound to the target <constant>GL_DISPATCH_INDIRECT_BUFFER</constant>. If no buffer object
|
|
is bound to this target, 0 is returned. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- // ARB_compute_shader -->
|
|
<!-- ARB_debug_group -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_DEBUG_GROUP_STACK_DEPTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the maximum depth of the
|
|
debug message group stack.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEBUG_GROUP_STACK_DEPTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the current depth of the
|
|
debug message group stack.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- // ARB_debug_group -->
|
|
<varlistentry>
|
|
<term><constant>GL_CONTEXT_FLAGS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the flags with which the context was created (such as debugging functionality).
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_CULL_FACE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether polygon culling
|
|
is enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_CURRENT_PROGRAM</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the name of the program object that is currently active, or 0 if no program object is active.
|
|
See <citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_CLEAR_VALUE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the value that is used to clear the depth buffer.
|
|
Integer values,
|
|
if requested,
|
|
are linearly mapped from the internal floating-point representation such
|
|
that 1.0 returns the most positive representable integer value,
|
|
and
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: -1.0: -->
|
|
<mml:mn>-1.0</mml:mn>
|
|
</mml:math></inlineequation>
|
|
returns the most negative representable integer
|
|
value. The initial value is 1.
|
|
See <citerefentry><refentrytitle>glClearDepth</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_FUNC</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the symbolic constant that indicates the depth comparison
|
|
function. The initial value is <constant>GL_LESS</constant>.
|
|
See <citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_RANGE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns two values:
|
|
the near and far mapping limits for the depth buffer.
|
|
Integer values,
|
|
if requested,
|
|
are linearly mapped from the internal floating-point representation such
|
|
that 1.0 returns the most positive representable integer value,
|
|
and
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: -1.0: -->
|
|
<mml:mn>-1.0</mml:mn>
|
|
</mml:math></inlineequation>
|
|
returns the most negative representable integer
|
|
value. The initial value is (0, 1).
|
|
See <citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_TEST</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether depth testing
|
|
of fragments is enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_WRITEMASK</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating if the depth buffer
|
|
is enabled for writing. The initial value is <constant>GL_TRUE</constant>.
|
|
See <citerefentry><refentrytitle>glDepthMask</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DITHER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether dithering of
|
|
fragment colors and indices is enabled. The initial value is <constant>GL_TRUE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DOUBLEBUFFER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether double buffering
|
|
is supported.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DRAW_BUFFER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating which buffers are being drawn to.
|
|
See <citerefentry><refentrytitle>glDrawBuffer</refentrytitle></citerefentry>. The initial value is <constant>GL_BACK</constant> if there
|
|
are back buffers, otherwise it is <constant>GL_FRONT</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DRAW_BUFFER</constant><emphasis>i</emphasis></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating which buffers are being drawn to by the corresponding output color.
|
|
See <citerefentry><refentrytitle>glDrawBuffers</refentrytitle></citerefentry>.
|
|
The initial value of <constant>GL_DRAW_BUFFER0</constant> is <constant>GL_BACK</constant> if there
|
|
are back buffers, otherwise it is <constant>GL_FRONT</constant>. The
|
|
initial values of draw buffers for all other output colors is <constant>GL_NONE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DRAW_FRAMEBUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the name of the framebuffer object currently bound to the <constant>GL_DRAW_FRAMEBUFFER</constant> target.
|
|
If the default framebuffer is bound, this value will be zero. The initial value is zero.
|
|
See <citerefentry><refentrytitle>glBindFramebuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_READ_FRAMEBUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the name of the framebuffer object currently bound to the <constant>GL_READ_FRAMEBUFFER</constant> target.
|
|
If the default framebuffer is bound, this value will be zero. The initial value is zero.
|
|
See <citerefentry><refentrytitle>glBindFramebuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_ELEMENT_ARRAY_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
currently bound to the target <constant>GL_ELEMENT_ARRAY_BUFFER</constant>. If no buffer object
|
|
is bound to this target, 0 is returned. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_FRAGMENT_SHADER_DERIVATIVE_HINT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating the mode of the derivative accuracy hint
|
|
for fragment shaders. The initial value
|
|
is <constant>GL_DONT_CARE</constant>.
|
|
See <citerefentry><refentrytitle>glHint</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_IMPLEMENTATION_COLOR_READ_FORMAT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single GLenum value indicating
|
|
the implementation's preferred pixel data format.
|
|
See <citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_IMPLEMENTATION_COLOR_READ_TYPE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single GLenum value indicating
|
|
the implementation's preferred pixel data type.
|
|
See <citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_LINE_SMOOTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether antialiasing of
|
|
lines is enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_LINE_SMOOTH_HINT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating the mode of the line antialiasing
|
|
hint. The initial value is <constant>GL_DONT_CARE</constant>.
|
|
See <citerefentry><refentrytitle>glHint</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_LINE_WIDTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the line width as specified with <citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>. The initial value is
|
|
1.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_LAYER_PROVOKING_VERTEX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the implementation dependent specifc vertex of a primitive that is used to select the rendering layer.
|
|
If the value returned is equivalent to <constant>GL_PROVOKING_VERTEX</constant>, then the vertex
|
|
selection follows the convention specified by
|
|
<citerefentry><refentrytitle>glProvokingVertex</refentrytitle></citerefentry>.
|
|
If the value returned is equivalent to <constant>GL_FIRST_VERTEX_CONVENTION</constant>, then the
|
|
selection is always taken from the first vertex in the primitive.
|
|
If the value returned is equivalent to <constant>GL_LAST_VERTEX_CONVENTION</constant>, then the
|
|
selection is always taken from the last vertex in the primitive.
|
|
If the value returned is equivalent to <constant>GL_UNDEFINED_VERTEX</constant>, then the
|
|
selection is not guaranteed to be taken from any specific vertex in the primitive.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_LOGIC_OP_MODE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating the selected logic operation
|
|
mode. The initial value is <constant>GL_COPY</constant>.
|
|
See <citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAJOR_VERSION</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the major version number of the OpenGL API supported by the current context.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_3D_TEXTURE_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a rough estimate of the largest 3D texture that the GL can handle.
|
|
The value must be at least 64.
|
|
Use <constant>GL_PROXY_TEXTURE_3D</constant> to determine if a texture is too large.
|
|
See <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_ARRAY_TEXTURE_LAYERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value.
|
|
The value indicates the maximum number of layers allowed in an array texture, and must be at least 256.
|
|
See <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_CLIP_DISTANCES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of application-defined clipping distances. The value must be at least 8.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COLOR_TEXTURE_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of samples in a color multisample texture.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- ARB_shader_atomic_counters -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the maximum number of atomic counters available to all active shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- // ARB_shader_atomic_counters -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of words for fragment shader uniform variables in all uniform
|
|
blocks (including default). The value must be at least 1.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of words for geometry shader uniform variables in all uniform
|
|
blocks (including default). The value must be at least 1.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value, the maximum supported texture image units that
|
|
can be used to access texture maps from the vertex shader and the fragment processor combined.
|
|
If both the vertex shader and the fragment processing stage access the same texture image
|
|
unit, then that counts as using two texture image units against this limit.
|
|
The value must be at least 48.
|
|
See <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_UNIFORM_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of uniform blocks per program. The value must be at least 70.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of words for vertex shader uniform variables in all uniform
|
|
blocks (including default). The value must be at least 1.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_CUBE_MAP_TEXTURE_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value.
|
|
The value gives a rough estimate of the largest cube-map texture that
|
|
the GL can handle. The value must be at least 1024.
|
|
Use <constant>GL_PROXY_TEXTURE_CUBE_MAP</constant>
|
|
to determine if a texture is too large.
|
|
See <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_DEPTH_TEXTURE_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of samples in a multisample depth or depth-stencil texture.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_DRAW_BUFFERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value, the maximum number
|
|
of simultaneous outputs that may be written in a fragment shader.
|
|
The value must be at least 8.
|
|
See <citerefentry><refentrytitle>glDrawBuffers</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_DUAL_SOURCE_DRAW_BUFFERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value, the maximum number
|
|
of active draw buffers when using dual-source blending. The value must be at least 1.
|
|
See <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry> and
|
|
<citerefentry><refentrytitle>glBlendFuncSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_ELEMENTS_INDICES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the recommended maximum number of vertex array indices.
|
|
See <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_ELEMENTS_VERTICES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the recommended maximum number of vertex array vertices.
|
|
See <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- ARB_shader_atomic_counters -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the maximum number of atomic counters available to fragment shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- // ARB_shader_atomic_counters -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of active shader storage blocks that may be accessed by a fragment shader.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_INPUT_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of components of the inputs read by the fragment shader, which must be at least 128.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of individual floating-point, integer, or boolean values that can be held
|
|
in uniform variable storage for a fragment shader. The value must be at least 1024.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_UNIFORM_VECTORS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of individual 4-vectors of floating-point, integer, or boolean values
|
|
that can be held
|
|
in uniform variable storage for a fragment shader. The value is equal to the value of
|
|
<constant>GL_MAX_FRAGMENT_UNIFORM_COMPONENTS</constant> divided by 4 and must be at least 256.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_UNIFORM_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of uniform blocks per fragment shader. The value must be at least 12.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAMEBUFFER_WIDTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum width for a framebuffer that has no attachments, which must be at least 16384.
|
|
See <citerefentry><refentrytitle>glFramebufferParameter</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAMEBUFFER_HEIGHT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum height for a framebuffer that has no attachments, which must be at least 16384.
|
|
See <citerefentry><refentrytitle>glFramebufferParameter</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAMEBUFFER_LAYERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of layers for a framebuffer that has no attachments, which must be at least 2048.
|
|
See <citerefentry><refentrytitle>glFramebufferParameter</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAMEBUFFER_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum samples in a framebuffer that has no attachments, which must be at least 4.
|
|
See <citerefentry><refentrytitle>glFramebufferParameter</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- ARB_shader_atomic_counter -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_GEOMETRY_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the maximum number of atomic counters available to geometry shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- // ARB_shader_atomic_counter -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of active shader storage blocks that may be accessed by a geometry shader.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_GEOMETRY_INPUT_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of components of inputs read by a geometry shader, which must be at least 64.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_GEOMETRY_OUTPUT_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of components of outputs written by a geometry shader, which must be at least 128.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value, the maximum supported texture image units that
|
|
can be used to access texture maps from the geometry shader. The value must be at least 16.
|
|
See <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_GEOMETRY_UNIFORM_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of uniform blocks per geometry shader. The value must be at least 12.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_GEOMETRY_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of individual floating-point, integer, or boolean values that can be held
|
|
in uniform variable storage for a geometry shader. The value must be at least 1024.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_INTEGER_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of samples supported in integer format multisample buffers.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MIN_MAP_BUFFER_ALIGNMENT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the minimum alignment in basic machine units of pointers returned from<citerefentry><refentrytitle>glMapBuffer</refentrytitle></citerefentry>
|
|
and <citerefentry><refentrytitle>glMapBufferRange</refentrytitle></citerefentry>. This value must be a power of two and must
|
|
be at least 64.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_LABEL_LENGTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum length of a label that may be assigned to an object.
|
|
See <citerefentry><refentrytitle>glObjectLabel</refentrytitle></citerefentry> and
|
|
<citerefentry><refentrytitle>glObjectPtrLabel</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_PROGRAM_TEXEL_OFFSET</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum texel offset allowed in a texture lookup, which must be at least 7.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MIN_PROGRAM_TEXEL_OFFSET</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the minimum texel offset allowed in a texture lookup, which must be at most -8.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_RECTANGLE_TEXTURE_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value.
|
|
The value gives a rough estimate of the largest rectangular texture that
|
|
the GL can handle. The value must be at least 1024.
|
|
Use <constant>GL_PROXY_TEXTURE_RECTANGLE</constant>
|
|
to determine if a texture is too large.
|
|
See <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_RENDERBUFFER_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value.
|
|
The value indicates the maximum supported size for renderbuffers.
|
|
See <citerefentry><refentrytitle>glFramebufferRenderbuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_SAMPLE_MASK_WORDS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of sample mask words.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_SERVER_WAIT_TIMEOUT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum <citerefentry><refentrytitle>glWaitSync</refentrytitle></citerefentry> timeout interval.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_SHADER_STORAGE_BUFFER_BINDINGS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of shader storage buffer binding points on the context, which must be at least 8.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- ARB_shader_atomic_counters -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TESS_CONTROL_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the maximum number of atomic counters available to tessellation control shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TESS_EVALUATION_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the maximum number of atomic counters available to tessellation evaluation shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of active shader storage blocks that may be accessed by a tessellation control shader.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TESS_EVALUATION_SHADER_STORAGE_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of active shader storage blocks that may be accessed by a tessellation evaluation shader.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- // ARB_shader_atomic_counters -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TEXTURE_BUFFER_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value.
|
|
The value gives the maximum number of texels allowed in the texel array of a texture buffer object.
|
|
Value must be at least 65536.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TEXTURE_IMAGE_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value, the maximum supported texture image units that
|
|
can be used to access texture maps from the fragment shader.
|
|
The value must be at least 16.
|
|
See <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TEXTURE_LOD_BIAS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum, absolute value of the texture level-of-detail bias. The
|
|
value must be at least 2.0.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TEXTURE_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value.
|
|
The value gives a rough estimate of the largest texture that
|
|
the GL can handle. The value must be at least 1024.
|
|
Use a proxy texture target such as <constant>GL_PROXY_TEXTURE_1D</constant> or <constant>GL_PROXY_TEXTURE_2D</constant>
|
|
to determine if a texture is too large.
|
|
See <citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_UNIFORM_BUFFER_BINDINGS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of uniform buffer binding points on the context, which must be at least 36.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_UNIFORM_BLOCK_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum size in basic machine units of a uniform block, which must be at least 16384.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_UNIFORM_LOCATIONS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of explicitly assignable uniform locations, which must be at least 1024.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VARYING_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number components for varying variables, which must be at least 60.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VARYING_VECTORS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number 4-vectors for varying variables, which is equal to the value of
|
|
<constant>GL_MAX_VARYING_COMPONENTS</constant> and must be at least 15.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VARYING_FLOATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of interpolators available for processing varying variables used by
|
|
vertex and fragment shaders. This value represents the number of individual floating-point
|
|
values that can be interpolated; varying variables declared as vectors, matrices, and arrays
|
|
will all consume multiple interpolators. The value must be at least 32.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- ARB_shader_atomic_counters -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the maximum number of atomic counters available to vertex shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<!-- /ARB_shader_atomic_counters -->
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_ATTRIBS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of 4-component generic vertex attributes accessible to a vertex shader.
|
|
The value must be at least 16.
|
|
See <citerefentry><refentrytitle>glVertexAttrib</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of active shader storage blocks that may be accessed by a vertex shader.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value, the maximum supported texture image units that
|
|
can be used to access texture maps from the vertex shader. The value may be at least 16.
|
|
See <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of individual floating-point, integer, or boolean values that can be held
|
|
in uniform variable storage for a vertex shader. The value must be at least 1024.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_UNIFORM_VECTORS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of 4-vectors that may be held in uniform variable storage for the vertex
|
|
shader. The value of <constant>GL_MAX_VERTEX_UNIFORM_VECTORS</constant> is equal to the
|
|
value of <constant>GL_MAX_VERTEX_UNIFORM_COMPONENTS</constant> and must be at least
|
|
256.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_OUTPUT_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of components of output written by a vertex shader, which must be at least 64.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_UNIFORM_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the maximum number of uniform blocks per vertex shader. The value must be at least 12.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VIEWPORT_DIMS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns two values:
|
|
the maximum supported width and height of the viewport.
|
|
These must be at least as large as the visible dimensions of the display
|
|
being rendered to.
|
|
See <citerefentry><refentrytitle>glViewport</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VIEWPORTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value, the maximum number
|
|
of simultaneous viewports that are supported.
|
|
The value must be at least 16.
|
|
See <citerefentry><refentrytitle>glViewportIndexed</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MINOR_VERSION</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the minor version number of the OpenGL API supported by the current context.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_NUM_COMPRESSED_TEXTURE_FORMATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single integer value indicating the number of available
|
|
compressed texture formats. The minimum value is 4.
|
|
See <citerefentry><refentrytitle>glCompressedTexImage2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_NUM_EXTENSIONS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of extensions supported by the GL implementation for the current context.
|
|
See <citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_NUM_PROGRAM_BINARY_FORMATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of program binary formats supported by the implementation.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_NUM_SHADER_BINARY_FORMATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of binary shader formats supported by the implementation. If this value is
|
|
greater than zero, then the implementation supports loading binary shaders. If it is
|
|
zero, then the loading of binary shaders by the implementation is not supported.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_ALIGNMENT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the byte alignment used for writing pixel data to memory. The initial
|
|
value is 4.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_IMAGE_HEIGHT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the image height used for writing pixel data to memory. The initial
|
|
value is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_LSB_FIRST</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether single-bit
|
|
pixels being written to memory are written first to the least significant
|
|
bit of each unsigned byte. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_ROW_LENGTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the row length used for writing pixel data to memory. The initial value is
|
|
0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_SKIP_IMAGES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of pixel images skipped before the first pixel is written
|
|
into memory. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_SKIP_PIXELS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of pixel locations skipped before the first pixel is written
|
|
into memory. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_SKIP_ROWS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of rows of pixel locations skipped before the first pixel is written
|
|
into memory. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_SWAP_BYTES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether the bytes of
|
|
two-byte and four-byte pixel indices and components are swapped before being
|
|
written to memory. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PIXEL_PACK_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
currently bound to the target <constant>GL_PIXEL_PACK_BUFFER</constant>. If no buffer object
|
|
is bound to this target, 0 is returned. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PIXEL_UNPACK_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
currently bound to the target <constant>GL_PIXEL_UNPACK_BUFFER</constant>. If no buffer object
|
|
is bound to this target, 0 is returned. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POINT_FADE_THRESHOLD_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the point size threshold for determining the point size.
|
|
See <citerefentry><refentrytitle>glPointParameter</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PRIMITIVE_RESTART_INDEX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the current primitive restart index. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPrimitiveRestartIndex</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PROGRAM_BINARY_FORMATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> an array of <constant>GL_NUM_PROGRAM_BINARY_FORMATS</constant> values,
|
|
indicating the proram binary formats supported by the implementation.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PROGRAM_PIPELINE_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> a single value, the name of the currently bound program pipeline
|
|
object, or zero if no program pipeline object is bound.
|
|
See <citerefentry><refentrytitle>glBindProgramPipeline</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PROGRAM_POINT_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether vertex
|
|
program point size mode is enabled. If enabled, then the
|
|
point size is taken from the shader built-in <code>gl_PointSize</code>. If disabled,
|
|
then the point size is taken from the point state as specified
|
|
by <citerefentry><refentrytitle>glPointSize</refentrytitle></citerefentry>.
|
|
The initial value is <constant>GL_FALSE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PROVOKING_VERTEX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the currently selected provoking vertex convention. The initial value is <constant>GL_LAST_VERTEX_CONVENTION</constant>.
|
|
See <citerefentry><refentrytitle>glProvokingVertex</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POINT_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the point size as specified by <citerefentry><refentrytitle>glPointSize</refentrytitle></citerefentry>.
|
|
The initial value is 1.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POINT_SIZE_GRANULARITY</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the size difference between adjacent supported sizes for antialiased points.
|
|
See <citerefentry><refentrytitle>glPointSize</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POINT_SIZE_RANGE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns two values:
|
|
the smallest and largest supported sizes for antialiased
|
|
points. The smallest size must be at most 1, and the largest size must
|
|
be at least 1.
|
|
See <citerefentry><refentrytitle>glPointSize</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POLYGON_OFFSET_FACTOR</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the scaling factor used to determine the variable offset that is added
|
|
to the depth value of each fragment generated when a polygon is
|
|
rasterized. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POLYGON_OFFSET_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value.
|
|
This value is multiplied by an implementation-specific value and then
|
|
added to the depth value of each fragment
|
|
generated when a polygon is rasterized. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POLYGON_OFFSET_FILL</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether polygon offset
|
|
is enabled for polygons in fill mode. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POLYGON_OFFSET_LINE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether polygon offset
|
|
is enabled for polygons in line mode. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POLYGON_OFFSET_POINT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether polygon offset
|
|
is enabled for polygons in point mode. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POLYGON_SMOOTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether antialiasing of
|
|
polygons is enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POLYGON_SMOOTH_HINT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating the mode of the polygon antialiasing
|
|
hint. The initial value is <constant>GL_DONT_CARE</constant>.
|
|
See <citerefentry><refentrytitle>glHint</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_READ_BUFFER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating which color buffer is selected for
|
|
reading. The initial value is <constant>GL_BACK</constant> if there is a back buffer,
|
|
otherwise it is <constant>GL_FRONT</constant>.
|
|
See
|
|
<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_RENDERBUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the renderbuffer object
|
|
currently bound to the target <constant>GL_RENDERBUFFER</constant>. If no renderbuffer object
|
|
is bound to this target, 0 is returned. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindRenderbuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SAMPLE_BUFFERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single integer value indicating the number of sample buffers
|
|
associated with the framebuffer.
|
|
See <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SAMPLE_COVERAGE_VALUE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single positive floating-point value indicating the
|
|
current sample coverage value.
|
|
See <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SAMPLE_COVERAGE_INVERT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating if the temporary
|
|
coverage value should be inverted.
|
|
See <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SAMPLER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the sampler object
|
|
currently bound to the active texture unit. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindSampler</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single integer value indicating the coverage mask size.
|
|
See <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SCISSOR_BOX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns four values:
|
|
the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
|
|
window coordinates of the scissor box,
|
|
followed by its width and height.
|
|
Initially the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
|
|
window coordinates are both 0 and the
|
|
width and height are set to the size of the window.
|
|
See <citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SCISSOR_TEST</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether scissoring is
|
|
enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SHADER_COMPILER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether an online shader
|
|
compiler is present in the implementation. All desktop OpenGL implementations must support
|
|
online shader compilations, and therefore the value of <constant>GL_SHADER_COMPILER</constant>
|
|
will always be <constant>GL_TRUE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SHADER_STORAGE_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with non-indexed variants of <function>glGet</function> (such as <function>glGetIntegerv</function>),
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
currently bound to the target <constant>GL_SHADER_STORAGE_BUFFER</constant>. If no buffer object
|
|
is bound to this target, 0 is returned.
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetIntegeri_v</function>),
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
bound to the indexed shader storage buffer binding points. The initial value is 0 for all targets.
|
|
See <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glBindBufferBase</refentrytitle></citerefentry>, and
|
|
<citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the minimum required alignment
|
|
for shader storage buffer sizes and offset. The initial value is 1.
|
|
See <citerefentry><refentrytitle>glShaderStorateBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SHADER_STORAGE_BUFFER_START</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>data</parameter> returns a single value, the start offset of the binding range for each
|
|
indexed shader storage buffer binding. The initial value is 0 for all bindings.
|
|
See <citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SHADER_STORAGE_BUFFER_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>data</parameter> returns a single value, the size of the binding range for each
|
|
indexed shader storage buffer binding. The initial value is 0 for all bindings.
|
|
See <citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SMOOTH_LINE_WIDTH_RANGE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a pair of values indicating the range of
|
|
widths supported for smooth (antialiased) lines. See <citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SMOOTH_LINE_WIDTH_GRANULARITY</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value indicating the level of
|
|
quantization applied to smooth line width parameters.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_BACK_FAIL</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating what action is taken for back-facing polygons when the stencil
|
|
test fails. The initial value is <constant>GL_KEEP</constant>.
|
|
See <citerefentry><refentrytitle>glStencilOpSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_BACK_FUNC</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating what function is used for back-facing polygons to compare the
|
|
stencil reference value with the stencil buffer value. The initial value
|
|
is <constant>GL_ALWAYS</constant>.
|
|
See <citerefentry><refentrytitle>glStencilFuncSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_BACK_PASS_DEPTH_FAIL</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating what action is taken for back-facing polygons when the stencil
|
|
test passes,
|
|
but the depth test fails. The initial value is <constant>GL_KEEP</constant>.
|
|
See <citerefentry><refentrytitle>glStencilOpSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_BACK_PASS_DEPTH_PASS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating what action is taken for back-facing polygons when the stencil
|
|
test passes and the depth test passes. The initial value is <constant>GL_KEEP</constant>.
|
|
See <citerefentry><refentrytitle>glStencilOpSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_BACK_REF</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the reference value that is compared with the contents of the stencil
|
|
buffer for back-facing polygons. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glStencilFuncSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_BACK_VALUE_MASK</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the mask that is used for back-facing polygons to mask both the stencil reference value and the
|
|
stencil buffer value before they are compared. The initial value is all 1's.
|
|
See <citerefentry><refentrytitle>glStencilFuncSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_BACK_WRITEMASK</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the mask that controls writing of the stencil bitplanes for back-facing polygons. The initial value
|
|
is all 1's.
|
|
See <citerefentry><refentrytitle>glStencilMaskSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_CLEAR_VALUE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the index to which the stencil bitplanes are cleared. The initial value is
|
|
0.
|
|
See <citerefentry><refentrytitle>glClearStencil</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_FAIL</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating what action is taken when the stencil
|
|
test fails. The initial value is <constant>GL_KEEP</constant>.
|
|
See <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>.
|
|
This stencil state only affects non-polygons
|
|
and front-facing polygons. Back-facing polygons use separate stencil state.
|
|
See <citerefentry><refentrytitle>glStencilOpSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_FUNC</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating what function is used to compare the
|
|
stencil reference value with the stencil buffer value. The initial value
|
|
is <constant>GL_ALWAYS</constant>.
|
|
See <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>.
|
|
This stencil state only affects non-polygons
|
|
and front-facing polygons. Back-facing polygons use separate stencil state.
|
|
See <citerefentry><refentrytitle>glStencilFuncSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_PASS_DEPTH_FAIL</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating what action is taken when the stencil
|
|
test passes,
|
|
but the depth test fails. The initial value is <constant>GL_KEEP</constant>.
|
|
See <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>.
|
|
This stencil state only affects non-polygons
|
|
and front-facing polygons. Back-facing polygons use separate stencil state.
|
|
See <citerefentry><refentrytitle>glStencilOpSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_PASS_DEPTH_PASS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
a symbolic constant indicating what action is taken when the stencil
|
|
test passes and the depth test passes. The initial value is <constant>GL_KEEP</constant>.
|
|
See <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>.
|
|
This stencil state only affects non-polygons
|
|
and front-facing polygons. Back-facing polygons use separate stencil state.
|
|
See <citerefentry><refentrytitle>glStencilOpSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_REF</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the reference value that is compared with the contents of the stencil
|
|
buffer. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>.
|
|
This stencil state only affects non-polygons
|
|
and front-facing polygons. Back-facing polygons use separate stencil state.
|
|
See <citerefentry><refentrytitle>glStencilFuncSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_TEST</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether stencil testing
|
|
of fragments is enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_VALUE_MASK</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the mask that is used to mask both the stencil reference value and the
|
|
stencil buffer value before they are compared. The initial value is all 1's.
|
|
See <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>.
|
|
This stencil state only affects non-polygons
|
|
and front-facing polygons. Back-facing polygons use separate stencil state.
|
|
See <citerefentry><refentrytitle>glStencilFuncSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_WRITEMASK</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the mask that controls writing of the stencil bitplanes. The initial value
|
|
is all 1's.
|
|
See <citerefentry><refentrytitle>glStencilMask</refentrytitle></citerefentry>.
|
|
This stencil state only affects non-polygons
|
|
and front-facing polygons. Back-facing polygons use separate stencil state.
|
|
See <citerefentry><refentrytitle>glStencilMaskSeparate</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STEREO</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether stereo buffers
|
|
(left and right) are supported.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SUBPIXEL_BITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
an estimate of the number of bits of subpixel resolution that are used to
|
|
position rasterized geometry in window coordinates. The value must be at least 4.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_1D</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_1D</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_1D_ARRAY</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_1D_ARRAY</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_2D</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_2D</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_2D_ARRAY</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_2D_ARRAY</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_2D_MULTISAMPLE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_2D_MULTISAMPLE</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_2D_MULTISAMPLE_ARRAY</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_3D</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_3D</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_BUFFER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_BUFFER</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_CUBE_MAP</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_CUBE_MAP</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_RECTANGLE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the texture
|
|
currently bound to the target <constant>GL_TEXTURE_RECTANGLE</constant>. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_COMPRESSION_HINT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value indicating the mode of the texture
|
|
compression hint. The initial value is <constant>GL_DONT_CARE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BINDING_BUFFER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
currently bound to the <constant>GL_TEXTURE_BUFFER</constant> buffer binding point. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the minimum required alignment
|
|
for texture buffer sizes and offset. The initial value is 1.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TIMESTAMP</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the 64-bit value of the current
|
|
GL time.
|
|
See <citerefentry><refentrytitle>glQueryCounter</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TRANSFORM_FEEDBACK_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
When used with non-indexed variants of <function>glGet</function> (such as <function>glGetIntegerv</function>),
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
currently bound to the target <constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant>. If no buffer object
|
|
is bound to this target, 0 is returned.
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetIntegeri_v</function>),
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
bound to the indexed transform feedback attribute stream. The initial value is 0 for all targets.
|
|
See <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glBindBufferBase</refentrytitle></citerefentry>, and
|
|
<citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TRANSFORM_FEEDBACK_BUFFER_START</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>data</parameter> returns a single value, the start offset of the binding range for each
|
|
transform feedback attribute stream. The initial value is 0 for all streams.
|
|
See <citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TRANSFORM_FEEDBACK_BUFFER_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>data</parameter> returns a single value, the size of the binding range for each
|
|
transform feedback attribute stream. The initial value is 0 for all streams.
|
|
See <citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNIFORM_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
When used with non-indexed variants of <function>glGet</function> (such as <function>glGetIntegerv</function>),
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
currently bound to the target <constant>GL_UNIFORM_BUFFER</constant>. If no buffer object
|
|
is bound to this target, 0 is returned.
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetIntegeri_v</function>),
|
|
<parameter>data</parameter> returns a single value, the name of the buffer object
|
|
bound to the indexed uniform buffer binding point. The initial value is 0 for all targets.
|
|
See <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glBindBufferBase</refentrytitle></citerefentry>, and
|
|
<citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the minimum required alignment
|
|
for uniform buffer sizes and offset. The initial value is 1.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNIFORM_BUFFER_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>data</parameter> returns a single value, the size of the binding range for each
|
|
indexed uniform buffer binding. The initial value is 0 for all bindings.
|
|
See <citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNIFORM_BUFFER_START</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>data</parameter> returns a single value, the start offset of the binding range for each
|
|
indexed uniform buffer binding. The initial value is 0 for all bindings.
|
|
See <citerefentry><refentrytitle>glBindBufferRange</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_ALIGNMENT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the byte alignment used for reading pixel data from memory. The initial
|
|
value is 4.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_IMAGE_HEIGHT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
</para>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the image height used for reading pixel data from memory. The initial
|
|
is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_LSB_FIRST</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether single-bit
|
|
pixels being read from memory are read first from the least significant
|
|
bit of each unsigned byte. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_ROW_LENGTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the row length used for reading pixel data from memory. The initial value
|
|
is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_SKIP_IMAGES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of pixel images skipped before the first pixel is read
|
|
from memory. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_SKIP_PIXELS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of pixel locations skipped before the first pixel is read
|
|
from memory. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_SKIP_ROWS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the number of rows of pixel locations skipped before the first pixel is read
|
|
from memory. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_SWAP_BYTES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single boolean value indicating whether the bytes of
|
|
two-byte and four-byte pixel indices and components are swapped after being
|
|
read from memory. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VERTEX_ARRAY_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the name of the vertex array object
|
|
currently bound to the context. If no vertex array object
|
|
is bound to the context, 0 is returned. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindVertexArray</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VERTEX_BINDING_DIVISOR</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Accepted by the indexed forms. <parameter>data</parameter> returns a single integer value representing the instance step
|
|
divisor of the first element in the bound buffer's data store for vertex attribute bound to <parameter>index</parameter>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VERTEX_BINDING_OFFSET</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Accepted by the indexed forms. <parameter>data</parameter> returns a single integer value representing the byte offset
|
|
of the first element in the bound buffer's data store for vertex attribute bound to <parameter>index</parameter>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VERTEX_BINDING_STRIDE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Accepted by the indexed forms. <parameter>data</parameter> returns a single integer value representing the byte offset
|
|
between the start of each element in the bound buffer's data store for vertex attribute bound to <parameter>index</parameter>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single integer value containing the maximum offset that may be added to a vertex binding
|
|
offset.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_ATTRIB_BINDINGS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single integer value containing the maximum number of vertex buffers that may be bound.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VIEWPORT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with non-indexed variants of <function>glGet</function> (such as <function>glGetIntegerv</function>),
|
|
<parameter>data</parameter> returns four values:
|
|
the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
|
|
window coordinates of the viewport, followed by its width and height.
|
|
Initially the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
|
|
window coordinates are both set to 0,
|
|
and the width and height are set to the width and height of the window into
|
|
which the GL will do its rendering.
|
|
See <citerefentry><refentrytitle>glViewport</refentrytitle></citerefentry>.
|
|
</para>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetIntegeri_v</function>),
|
|
<parameter>data</parameter> returns four values:
|
|
the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
|
|
window coordinates of the indexed viewport, followed by its width and height.
|
|
Initially the
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
|
|
window coordinates are both set to 0,
|
|
and the width and height are set to the width and height of the window into
|
|
which the GL will do its rendering.
|
|
See <citerefentry><refentrytitle>glViewportIndexedf</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VIEWPORT_BOUNDS_RANGE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns two values, the minimum and maximum viewport bounds range.
|
|
The minimum range should be at least [-32768, 32767].
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VIEWPORT_INDEX_PROVOKING_VERTEX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns one value,
|
|
the implementation dependent specifc vertex of a primitive that is used to select the viewport index.
|
|
If the value returned is equivalent to <constant>GL_PROVOKING_VERTEX</constant>, then the vertex
|
|
selection follows the convention specified by
|
|
<citerefentry><refentrytitle>glProvokingVertex</refentrytitle></citerefentry>.
|
|
If the value returned is equivalent to <constant>GL_FIRST_VERTEX_CONVENTION</constant>, then the
|
|
selection is always taken from the first vertex in the primitive.
|
|
If the value returned is equivalent to <constant>GL_LAST_VERTEX_CONVENTION</constant>, then the
|
|
selection is always taken from the last vertex in the primitive.
|
|
If the value returned is equivalent to <constant>GL_UNDEFINED_VERTEX</constant>, then the
|
|
selection is not guaranteed to be taken from any specific vertex in the primitive.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VIEWPORT_SUBPIXEL_BITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the number of bits of sub-pixel precision which the GL
|
|
uses to interpret the floating point viewport bounds. The minimum value is 0.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_ELEMENT_INDEX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>data</parameter> returns a single value, the maximum index that may be specified during the
|
|
transfer of generic vertex attributes to the GL.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
<para>
|
|
Many of the boolean parameters can also be queried more easily using
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>
|
|
The following parameters return the associated value for the active texture unit:
|
|
<constant>GL_TEXTURE_1D</constant>, <constant>GL_TEXTURE_BINDING_1D</constant>,
|
|
<constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_BINDING_2D</constant>,
|
|
<constant>GL_TEXTURE_3D</constant> and <constant>GL_TEXTURE_BINDING_3D</constant>.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_VIEWPORTS</constant>, <constant>GL_VIEWPORT_SUBPIXEL_BITS</constant>,
|
|
<constant>GL_VIEWPORT_BOUNDS_RANGE</constant>, <constant>GL_LAYER_PROVOKING_VERTEX</constant>,
|
|
and <constant>GL_VIEWPORT_INDEX_PROVOKING_VERTEX</constant>
|
|
are available only if the GL version is 4.1 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_VERTEX_ATOMIC_COUNTERS</constant>,
|
|
<constant>GL_MAX_TESS_CONTROL_ATOMIC_COUNTERS</constant>,
|
|
<constant>GL_MAX_TESS_EVALUATION_ATOMIC_COUNTERS</constant>,
|
|
<constant>GL_MAX_GEOMETRY_ATOMIC_COUNTERS</constant>,
|
|
<constant>GL_MAX_FRAMGENT_ATOMIC_COUNTERS</constant>, and
|
|
<constant>GL_MIN_MAP_BUFFER_ALIGNMENT</constant> are accepted by <parameter>pname</parameter>
|
|
only if the GL version is 4.2 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_ELEMENT_INDEX</constant> is accepted by <parameter>pname</parameter> only
|
|
if the GL version is 4.3 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_COMPUTE_UNIFORM_BLOCKS</constant>, <constant>GL_MAX_COMPUTE_TEXTURE_IMAGE_UNITS</constant>,
|
|
<constant>GL_MAX_COMPUTE_UNIFORM_COMPONENTS</constant>, <constant>GL_MAX_COMPUTE_ATOMIC_COUNTERS</constant>,
|
|
<constant>GL_MAX_COMPUTE_ATOMIC_COUNTER_BUFFERS</constant>, <constant>GL_MAX_COMBINED_COMPUTE_UNIFORM_COMPONENTS</constant>,
|
|
<constant>GL_MAX_COMPUTE_WORK_GROUP_INVOCATIONS</constant>, <constant>GL_MAX_COMPUTE_WORK_GROUP_COUNT</constant>, and
|
|
<constant>GL_MAX_COMPUTE_WORK_GROUP_SIZE</constant> and <constant>GL_DISPATCH_INDIRECT_BUFFER_BINDING</constant> are available only if the GL version
|
|
is 4.3 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_DEBUG_GROUP_STACK_DEPTH</constant>, <constant>GL_DEBUG_GROUP_STACK_DEPTH</constant> and <constant>GL_MAX_LABEL_LENGTH</constant> are accepted only if
|
|
the GL version is 4.3 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_UNIFORM_LOCATIONS</constant> is accepted only if the GL version is 4.3 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_FRAMEBUFFER_WIDTH</constant>, <constant>GL_MAX_FRAMEBUFFER_HEIGHT</constant>, <constant>GL_MAX_FRAMEBUFFER_LAYERS</constant>,
|
|
and <constant>GL_MAX_FRAMEBUFFER_SAMPLES</constant> are available only if the GL version is 4.3 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS</constant>, <constant>GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS</constant>,
|
|
<constant>GL_MAX_TESS_EVALUATION_SHADER_STORAGE_BLOCKS</constant>, <constant>GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS</constant>,
|
|
<constant>GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS</constant>, and <constant>GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS</constant> are available
|
|
only if the GL version is 4.3 or higher.
|
|
</para>
|
|
<para>
|
|
<constant>GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT</constant> is available only if the GL version is 4.3 or greater.
|
|
</para>
|
|
<para>
|
|
<constant>GL_VERTEX_BINDING_DIVISOR</constant>, <constant>GL_VERTEX_BINDING_OFFSET</constant>, <constant>GL_VERTEX_BINDING_STRIDE</constant>,
|
|
<constant>GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET</constant> and <constant>GL_MAX_VERTEX_ATTRIB_BINDINGS</constant> are available only if
|
|
the GL version is 4.3 or greater.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para>
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not an accepted value.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_VALUE</constant> is generated on any of <function>glGetBooleani_v</function>,
|
|
<function>glGetIntegeri_v</function>, or <function>glGetInteger64i_v</function> if
|
|
<parameter>index</parameter> is outside of the valid range for the indexed state <parameter>target</parameter>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetAttachedShaders</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetAttribLocation</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetBufferParameter</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetBufferPointerv</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetBufferSubData</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetCompressedTexImage</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetError</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetProgramInfoLog</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetQueryiv</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetQueryObject</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetShader</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetShaderInfoLog</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetShaderSource</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetTexImage</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetTexLevelParameter</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetVertexAttrib</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetVertexAttribPointerv</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glIsEnabled</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> 2010-2013 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>
|