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2336 lines
127 KiB
XML
2336 lines
127 KiB
XML
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGet">
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<info>
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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>2010-2014</year>
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<holder>Khronos Group</holder>
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</copyright>
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</info>
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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>
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<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>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>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 xml: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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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 xml: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>params</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>params</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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
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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> 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>params</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>params</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_ALIASED_POINT_SIZE_RANGE</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns two values:
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the smallest and largest supported sizes for
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points. The smallest size must be at most 1, and the largest size must
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be at least 1.
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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_ALPHA_BITS</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns one value,
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the number of alpha bitplanes in the color buffer of the
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currently bound draw framebuffer. This is defined only if all color attachments
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of the draw framebuffer have identical formats, in which case the number of alpha bits
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of color attachment zero are returned.
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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>params</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>params</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>params</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>params</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>params</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_ALPHA</constant></term>
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<listitem>
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<para>
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<parameter>params</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_EQUATION_RGB</constant></term>
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<listitem>
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<para>
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<parameter>params</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_SRC_ALPHA</constant></term>
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<listitem>
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<para>
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<parameter>params</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>params</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_BLUE_BITS</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns one value,
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the number of blue bitplanes in the color buffer of the
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currently bound draw framebuffer. This is defined only if all color attachments
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of the draw framebuffer have identical formats, in which case the number of blue bits
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of color attachment zero are returned.
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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>params</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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
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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_WRITEMASK</constant></term>
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<listitem>
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<para>
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<parameter>params</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>params</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_COPY_READ_BUFFER_BINDING</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns a single value, the name of the buffer object
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currently bound to the target <constant>GL_COPY_READ_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_COPY_WRITE_BUFFER_BINDING</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns a single value, the name of the buffer object
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currently bound to the target <constant>GL_COPY_WRITE_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_CULL_FACE</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns a single boolean value indicating whether polygon culling
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is enabled. The initial value is <constant>GL_FALSE</constant>.
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See <citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_CULL_FACE_MODE</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns a single value indicating the mode of polygon culling.
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The initial value is <constant>GL_BACK</constant>.
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See <citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_CURRENT_PROGRAM</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns one value,
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the name of the program object that is currently active, or 0 if no program object is active.
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See <citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_DEPTH_BITS</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns one value,
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the number of bitplanes in the depth buffer of the
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currently bound framebuffer.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_DEPTH_CLEAR_VALUE</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns one value,
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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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
|
|
<!-- 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 1.
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See <citerefentry><refentrytitle>glClearDepthf</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_DEPTH_FUNC</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns one value,
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the symbolic constant that indicates the depth comparison
|
|
function. The initial value is <constant>GL_LESS</constant>.
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See <citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
|
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<varlistentry>
|
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<term><constant>GL_DEPTH_RANGE</constant></term>
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<listitem>
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<para>
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<parameter>params</parameter> returns two values:
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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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
|
|
<!-- 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>glDepthRangef</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_TEST</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>glDepthRangef</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_DEPTH_WRITEMASK</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_DISPATCH_INDIRECT_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<varlistentry>
|
|
<term><constant>GL_DITHER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_DRAW_BUFFER</constant><emphasis>i</emphasis></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>. 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>params</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_ELEMENT_ARRAY_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>params</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_FRONT_FACE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value indicating the winding order
|
|
of polygon front faces.
|
|
The initial value is <constant>GL_CCW</constant>.
|
|
See <citerefentry><refentrytitle>glFrontFace</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_GENERATE_MIPMAP_HINT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
a symbolic constant indicating the mode of the generate mipmap quality hint.
|
|
The initial value is
|
|
<constant>GL_DONT_CARE</constant>. See
|
|
<citerefentry><refentrytitle>glHint</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_GREEN_BITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the number of green bitplanes in the color buffer of the
|
|
currently bound draw framebuffer. This is defined only if all color attachments
|
|
of the draw framebuffer have identical formats, in which case the number of green bits
|
|
of color attachment zero are returned.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_IMAGE_BINDING_LAYERED</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
corresponding to whether the image bound to the indexed image unit is layered or not.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_IMPLEMENTATION_COLOR_READ_FORMAT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value, the format
|
|
chosen by the implementation in which pixels may be read from the
|
|
color buffer of the currently bound framebuffer in conjunction with
|
|
<constant>GL_IMPLEMENTATION_COLOR_READ_TYPE</constant>.
|
|
See <citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_IMPLEMENTATION_COLOR_READ_TYPE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value, the type
|
|
chosen by the implementation with which pixels may be read from the
|
|
color buffer of the currently bound framebuffer in conjunction with
|
|
<constant>GL_IMPLEMENTATION_COLOR_READ_FORMAT</constant>.
|
|
See <citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_LINE_WIDTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_MAJOR_VERSION</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the major version number of the OpenGL ES API supported by the current context.
|
|
This must be 3.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_3D_TEXTURE_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
a rough estimate of the largest 3D texture that the GL can handle.
|
|
The value must be at least 256. See <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_ARRAY_TEXTURE_LAYERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_COLOR_ATTACHMENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value, the maximum number
|
|
of color attachment points in a framebuffer object.
|
|
The value must be at least 4.
|
|
See <citerefentry><refentrytitle>glFramebufferRenderbuffer</refentrytitle></citerefentry>
|
|
and <citerefentry><refentrytitle>glFramebufferTexture2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COLOR_TEXTURE_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of samples in a color multisample texture.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value, the maximum number of atomic counters available to all active shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_COMPUTE_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the number of words for compute 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_FRAGMENT_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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
|
|
<constant>GL_MAX_FRAGMENT_UNIFORM_COMPONENTS</constant> +
|
|
<constant>GL_MAX_UNIFORM_BLOCK_SIZE</constant> * <constant>GL_MAX_FRAGMENT_UNIFORM_BLOCKS</constant> / 4.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_SHADER_STORAGE_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum total number of active shader storage blocks that may be accessed by all active shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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 32.
|
|
See <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_UNIFORM_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of uniform blocks per program. The value must be at least 24.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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 .
|
|
<constant>GL_MAX_VERTEX_UNIFORM_COMPONENTS</constant> +
|
|
<constant>GL_MAX_UNIFORM_BLOCK_SIZE</constant> * <constant>GL_MAX_VERTEX_UNIFORM_BLOCKS</constant> / 4.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value, the maximum number of atomic counters available to compute shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_ATOMIC_COUNTER_BUFFERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value, the maximum number of atomic counter buffers that may be accessed by a compute shader.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of active shader storage blocks that may be accessed by a compute shader.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_TEXTURE_IMAGE_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value, the maximum supported texture image units that
|
|
can be used to access texture maps from the compute shader. The value may be at least 16.
|
|
See <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_UNIFORM_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of uniform blocks per compute shader. The value must be at least 14.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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 compute shader. The value must be at least 1024.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_WORK_GROUP_INVOCATIONS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the number of invocations in a single local work group
|
|
(i.e., the product of the three dimensions) that may
|
|
be dispatched to a compute shader.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_WORK_GROUP_COUNT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Accepted by the indexed versions of <function>glGet</function>.
|
|
<parameter>params</parameter> the maximum number of work
|
|
groups that may be dispatched to a compute shader. Indices
|
|
0, 1, and 2 correspond to the X, Y and Z dimensions, respectively.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_COMPUTE_WORK_GROUP_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
Accepted by the indexed versions of <function>glGet</function>.
|
|
<parameter>params</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_MAX_CUBE_MAP_TEXTURE_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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 2048.
|
|
See <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_DRAW_BUFFERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value, the maximum number
|
|
of simultaneous outputs that may be written in a fragment shader.
|
|
The value must be at least 4.
|
|
See <citerefentry><refentrytitle>glDrawBuffers</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_ELEMENT_INDEX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum index supported by the implementation.
|
|
The value must be at least
|
|
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
|
|
<!-- eqn: 2 sup 24 - 1: -->
|
|
<mml:mrow>
|
|
<mml:msup>
|
|
<mml:mn>2</mml:mn>
|
|
<mml:mn>24</mml:mn>
|
|
</mml:msup>
|
|
<mml:mo>-</mml:mo>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mrow>
|
|
</mml:math></inlineequation>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_ELEMENTS_INDICES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>params</parameter> returns one value,
|
|
the recommended maximum number of vertex array vertices.
|
|
See <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value, the maximum number of atomic counters available to fragment shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_INPUT_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of components of the inputs read by the fragment shader, which must be at least 60.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_UNIFORM_BLOCKS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_FRAGMENT_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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 896.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAGMENT_UNIFORM_VECTORS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of vector floating-point, integer, or boolean values that can be held
|
|
in uniform variable storage for a fragment shader. The value must be at least 224.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAMEBUFFER_HEIGHT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum height for a framebuffer that has no attachments, which must be at least 16384.
|
|
See <citerefentry><refentrytitle>glFramebufferParameteri</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAMEBUFFER_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum samples in a framebuffer that has no attachments, which must be at least 4.
|
|
See <citerefentry><refentrytitle>glFramebufferParameteri</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_FRAMEBUFFER_WIDTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum width for a framebuffer that has no attachments, which must be at least 16384.
|
|
See <citerefentry><refentrytitle>glFramebufferParameteri</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_INTEGER_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of samples supported in integer format multisample buffers.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_PROGRAM_TEXEL_OFFSET</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_MAX_RENDERBUFFER_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value.
|
|
The value indicates the maximum supported size for renderbuffers and must be at least 2048.
|
|
See <citerefentry><refentrytitle>glFramebufferRenderbuffer</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_SAMPLE_MASK_WORDS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of sample mask words.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_SAMPLES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value.
|
|
The value indicates the maximum supported number of samples for multisampling.
|
|
The value must be at least 4.
|
|
See <citerefentry><refentrytitle>glGetInternalformativ</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_SERVER_WAIT_TIMEOUT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TEXTURE_IMAGE_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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 2048.
|
|
See <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of components which can be written to a single transform feedback buffer in
|
|
interleaved mode. The value must be at least 64.
|
|
See <citerefentry><refentrytitle>glTransformFeedbackVaryings</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum separate attributes or outputs which can be captured in separate
|
|
transform feedback mode. The value must be at least 4.
|
|
See <citerefentry><refentrytitle>glTransformFeedbackVaryings</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of components which can be written per attribute or output in separate
|
|
transform feedback mode. The value must be at least 4.
|
|
See <citerefentry><refentrytitle>glTransformFeedbackVaryings</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_UNIFORM_BLOCK_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum size in basic machine units of a uniform block.
|
|
The value must be at least 16384.
|
|
See <citerefentry><refentrytitle>glUniformBlockBinding</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_UNIFORM_BUFFER_BINDINGS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of uniform buffer binding points on the context, which must be at least 24.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_UNIFORM_LOCATIONS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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 vector
|
|
values that can be interpolated; varying variables declared as matrices and arrays
|
|
will consume multiple interpolators. The value must be at least 15.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_ATOMIC_COUNTERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value, the maximum number of atomic counters available to vertex shaders.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_ATTRIB_BINDINGS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single integer value containing the maximum number of vertex buffers that may be bound.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_ATTRIBS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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_OUTPUT_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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_VERTEX_UNIFORM_COMPONENTS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</parameter> returns one value,
|
|
the maximum number of vector floating-point, integer, or boolean values that can be held
|
|
in uniform variable storage for a vertex shader. The value must be at least 256.
|
|
See <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_MAX_VIEWPORT_DIMS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_MIN_PROGRAM_TEXEL_OFFSET</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_MINOR_VERSION</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the minor version number of the OpenGL ES API supported by the current context.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_NUM_COMPRESSED_TEXTURE_FORMATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single integer value indicating the number of available
|
|
compressed texture formats. The minimum value is 10.
|
|
See <citerefentry><refentrytitle>glCompressedTexImage2D</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_NUM_EXTENSIONS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</parameter> returns a single integer value indicating the number of available
|
|
program binary formats. The minimum value is 0.
|
|
See <citerefentry><refentrytitle>glProgramBinary</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_NUM_SHADER_BINARY_FORMATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single integer value indicating the number of available
|
|
shader binary formats. The minimum value is 0.
|
|
See <citerefentry><refentrytitle>glShaderBinary</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_ALIGNMENT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the byte alignment used for writing pixel data to memory. The initial
|
|
value is 4.
|
|
See <citerefentry><refentrytitle>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_ROW_LENGTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the row length used for writing pixel data to memory. The initial value is
|
|
0.
|
|
See <citerefentry><refentrytitle>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_SKIP_PIXELS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PACK_SKIP_ROWS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PIXEL_PACK_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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_POLYGON_OFFSET_FACTOR</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_FILL</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single boolean value indicating whether polygon offset
|
|
is enabled for polygons. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_POLYGON_OFFSET_UNITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_PRIMITIVE_RESTART_FIXED_INDEX</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single boolean value indicating whether primitive restart
|
|
with a fixed index is enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PROGRAM_BINARY_FORMATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a list of symbolic
|
|
constants of length <constant>GL_NUM_PROGRAM_BINARY_FORMATS</constant>
|
|
indicating which program binary formats are available.
|
|
See <citerefentry><refentrytitle>glProgramBinary</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_PROGRAM_PIPELINE_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_READ_BUFFER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
a symbolic constant indicating which color buffer is selected for
|
|
reading. The initial value is <constant>GL_BACK</constant>.
|
|
See
|
|
<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_READ_FRAMEBUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_RED_BITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the number of red bitplanes in the color buffer of the
|
|
currently bound draw framebuffer. This is defined only if all color attachments
|
|
of the draw framebuffer have identical formats, in which case the number of red bits
|
|
of color attachment zero are returned.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_RENDERBUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_ALPHA_TO_COVERAGE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single boolean value indicating whether modification
|
|
of sample coverage based on alpha is
|
|
enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
See <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SAMPLE_BUFFERS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single boolean value indicating whether modification
|
|
of sample coverage based on the value specified by
|
|
<citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry> is
|
|
enabled. The initial value is <constant>GL_FALSE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SAMPLE_COVERAGE_INVERT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_SAMPLE_COVERAGE_VALUE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_SAMPLER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</parameter> returns four values:
|
|
the
|
|
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><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>
|
|
<parameter>params</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_BINARY_FORMATS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a list of symbolic
|
|
constants of length <constant>GL_NUM_SHADER_BINARY_FORMATS</constant>
|
|
indicating which shader binary formats are available.
|
|
See <citerefentry><refentrytitle>glShaderBinary</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_SHADER_COMPILER</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single boolean value indicating whether
|
|
a shader compiler is supported. This value is always <constant>GL_TRUE</constant>.
|
|
See <citerefentry><refentrytitle>glCompileShader</refentrytitle></citerefentry>.
|
|
</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>params</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>params</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>
|
|
<parameter>params</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_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>params</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_SHADER_STORAGE_BUFFER_START</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>params</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_STENCIL_BACK_FAIL</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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_BITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the number of bitplanes in the stencil buffer of the
|
|
currently bound framebuffer.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_STENCIL_CLEAR_VALUE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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>
|
|
<parameter>params</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_SUBPIXEL_BITS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_2D</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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_3D</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_CUBE_MAP</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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_2D_MULTISAMPLE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>
|
|
<parameter>params</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_TRANSFORM_FEEDBACK_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value, the name of the transform feedback object
|
|
currently bound to the <constant>GL_TRANSFORM_FEEDBACK</constant> target. If no transform feedback object
|
|
is bound to this target, 0 is returned. The initial value is 0.
|
|
See <citerefentry><refentrytitle>glBindTransformFeedback</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TRANSFORM_FEEDBACK_ACTIVE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single boolean value indicating if the currently
|
|
bound transform feedback object is active.
|
|
See <citerefentry><refentrytitle>glBeginTransformFeedback</refentrytitle></citerefentry>
|
|
and <citerefentry><refentrytitle>glResumeTransformFeedback</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TRANSFORM_FEEDBACK_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with non-indexed variants of <function>glGet</function> (such as <function>glGetIntegerv</function>),
|
|
<parameter>params</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>params</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_PAUSED</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single boolean value indicating if the currently
|
|
bound transform feedback object is paused.
|
|
See <citerefentry><refentrytitle>glPauseTransformFeedback</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_TRANSFORM_FEEDBACK_BUFFER_SIZE</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>params</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_TRANSFORM_FEEDBACK_BUFFER_START</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>params</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_UNIFORM_BUFFER_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
When used with non-indexed variants of <function>glGet</function> (such as <function>glGetIntegerv</function>),
|
|
<parameter>params</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>params</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>
|
|
<parameter>params</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>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>params</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>
|
|
When used with indexed variants of <function>glGet</function> (such as <function>glGetInteger64i_v</function>),
|
|
<parameter>params</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>
|
|
<parameter>params</parameter> returns one value,
|
|
the byte alignment used for reading pixel data from memory. The initial
|
|
value is 4.
|
|
See <citerefentry><refentrytitle>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_IMAGE_HEIGHT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the image height used for reading pixel data from memory. The initial
|
|
is 0.
|
|
See <citerefentry><refentrytitle>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_ROW_LENGTH</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns one value,
|
|
the row length used for reading pixel data from memory. The initial value
|
|
is 0.
|
|
See <citerefentry><refentrytitle>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_SKIP_IMAGES</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_SKIP_PIXELS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_UNPACK_SKIP_ROWS</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</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>glPixelStorei</refentrytitle></citerefentry>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><constant>GL_VERTEX_ARRAY_BINDING</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns a single value, the name of the vertex array object
|
|
currently bound. If no vertex array object is bound, 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>params</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>params</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>params</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_VIEWPORT</constant></term>
|
|
<listitem>
|
|
<para>
|
|
<parameter>params</parameter> returns four values:
|
|
the
|
|
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><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 xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
|
|
and
|
|
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><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>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
<para>
|
|
Many of the boolean parameters can also be queried more easily using
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 xml:id="notes"><title>Notes</title>
|
|
<para>
|
|
The following parameters return the associated value for the active texture unit:
|
|
<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_VERTEX_ATOMIC_COUNTERS</constant>,
|
|
<constant>GL_MAX_FRAMGENT_ATOMIC_COUNTERS</constant>,
|
|
<constant>GL_MAX_COMPUTE_ATOMIC_COUNTERS</constant>,
|
|
<constant>GL_MAX_COMBINED_ATOMIC_COUNTERS</constant>,
|
|
<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_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>,
|
|
<constant>GL_MAX_COMPUTE_WORK_GROUP_SIZE</constant>,
|
|
<constant>GL_DISPATCH_INDIRECT_BUFFER_BINDING</constant>,
|
|
<constant>GL_MAX_UNIFORM_LOCATIONS</constant>,
|
|
<constant>GL_MAX_FRAMEBUFFER_WIDTH</constant>,
|
|
<constant>GL_MAX_FRAMEBUFFER_HEIGHT</constant>,
|
|
<constant>GL_MAX_FRAMEBUFFER_SAMPLES</constant>,
|
|
<constant>GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS</constant>,
|
|
<constant>GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS</constant>,
|
|
<constant>GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS</constant>,
|
|
<constant>GL_MAX_COMBINED_SHADER_STORAGE_BLOCKS</constant>,
|
|
<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 ES version is 3.1 or greater.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 xml: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 either <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 xml:id="versions">
|
|
<title>API Version Support</title>
|
|
<informaltable>
|
|
<tgroup cols="4" align="left">
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
|
|
<tbody>
|
|
<row>
|
|
<entry><function>glGetBooleanv</function></entry>
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
|
|
</row>
|
|
<row>
|
|
<entry><function>glGetBooleani_v</function></entry>
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es31']/*)"/>
|
|
</row>
|
|
<row>
|
|
<entry><function>glGetFloatv</function></entry>
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
|
|
</row>
|
|
<row>
|
|
<entry><function>glGetIntegerv</function></entry>
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
|
|
</row>
|
|
<row>
|
|
<entry><function>glGetInteger64v</function></entry>
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es30']/*)"/>
|
|
</row>
|
|
<row>
|
|
<entry><function>glGetIntegeri_v</function></entry>
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es30']/*)"/>
|
|
</row>
|
|
<row>
|
|
<entry><function>glGetInteger64i_v</function></entry>
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es30']/*)"/>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</informaltable>
|
|
</refsect1>
|
|
<refsect1 xml: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>glGetError</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetProgramiv</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetProgramInfoLog</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetQueryiv</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetQueryObjectuiv</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetShaderiv</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetShaderInfoLog</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetShaderSource</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glGetString</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 xml:id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"/> 1991-2006 Silicon Graphics, Inc.
|
|
Copyright <trademark class="copyright"/> 2010-2014 Khronos Group.
|
|
This document is licensed under the SGI Free Software B License.
|
|
For details, see
|
|
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</link>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|