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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
<!-- Converted by db4-upgrade version 1.1 -->
<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetTexParameter">
<info>
<copyright>
<year>1991-2006</year>
<holder>Silicon Graphics, Inc.</holder>
</copyright>
<copyright>
<year>2010-2014</year>
<holder>Khronos Group</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>glGetTexParameter</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glGetTexParameter</refname>
<refpurpose>return texture parameter values</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glGetTexParameterfv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLfloat * <parameter>params</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glGetTexParameteriv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint * <parameter>params</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glGetTexParameterIiv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint * <parameter>params</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glGetTexParameterIuiv</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLuint * <parameter>params</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glGetTextureParameterfv</function></funcdef>
<paramdef>GLuint <parameter>texture</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLfloat *<parameter>params</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glGetTextureParameteriv</function></funcdef>
<paramdef>GLuint <parameter>texture</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint *<parameter>params</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glGetTextureParameterIiv</function></funcdef>
<paramdef>GLuint <parameter>texture</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint *<parameter>params</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glGetTextureParameterIuiv</function></funcdef>
<paramdef>GLuint <parameter>texture</parameter></paramdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLuint *<parameter>params</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="parameters">
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<para>Specifies the target to which the texture is bound for
<function>glGetTexParameterfv</function>,
<function>glGetTexParameteriv</function>,
<function>glGetTexParameterIiv</function>, and
<function>glGetTexParameterIuiv</function> functions.
<constant>GL_TEXTURE_1D</constant>,
<constant>GL_TEXTURE_1D_ARRAY</constant>,
<constant>GL_TEXTURE_2D</constant>,
<constant>GL_TEXTURE_2D_ARRAY</constant>,
<constant>GL_TEXTURE_2D_MULTISAMPLE</constant>,
<constant>GL_TEXTURE_2D_MULTISAMPLE_ARRAY</constant>,
<constant>GL_TEXTURE_3D</constant>,
<constant>GL_TEXTURE_CUBE_MAP</constant>,
<constant>GL_TEXTURE_RECTANGLE</constant>, and
<constant>GL_TEXTURE_CUBE_MAP_ARRAY</constant> are accepted.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>texture</parameter></term>
<listitem>
<para>Specifies the texture object name for
<function>glGetTextureParameterfv</function>,
<function>glGetTextureParameteriv</function>,
<function>glGetTextureParameterIiv</function>, and
<function>glGetTextureParameterIuiv</function> functions.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pname</parameter></term>
<listitem>
<para>Specifies the symbolic name of a texture parameter.
<constant>GL_DEPTH_STENCIL_TEXTURE_MODE</constant>,
<constant>GL_IMAGE_FORMAT_COMPATIBILITY_TYPE</constant>,
<constant>GL_TEXTURE_BASE_LEVEL</constant>,
<constant>GL_TEXTURE_BORDER_COLOR</constant>,
<constant>GL_TEXTURE_COMPARE_MODE</constant>,
<constant>GL_TEXTURE_COMPARE_FUNC</constant>,
<constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant>,
<constant>GL_TEXTURE_IMMUTABLE_LEVELS</constant>,
<constant>GL_TEXTURE_LOD_BIAS</constant>,
<constant>GL_TEXTURE_MAG_FILTER</constant>,
<constant>GL_TEXTURE_MAX_LEVEL</constant>,
<constant>GL_TEXTURE_MAX_LOD</constant>,
<constant>GL_TEXTURE_MIN_FILTER</constant>,
<constant>GL_TEXTURE_MIN_LOD</constant>,
<constant>GL_TEXTURE_SWIZZLE_R</constant>,
<constant>GL_TEXTURE_SWIZZLE_G</constant>,
<constant>GL_TEXTURE_SWIZZLE_B</constant>,
<constant>GL_TEXTURE_SWIZZLE_A</constant>,
<constant>GL_TEXTURE_SWIZZLE_RGBA</constant>,
<constant>GL_TEXTURE_TARGET</constant>,
<constant>GL_TEXTURE_VIEW_MIN_LAYER</constant>,
<constant>GL_TEXTURE_VIEW_MIN_LEVEL</constant>,
<constant>GL_TEXTURE_VIEW_NUM_LAYERS</constant>,
<constant>GL_TEXTURE_VIEW_NUM_LEVELS</constant>,
<constant>GL_TEXTURE_WRAP_S</constant>,
<constant>GL_TEXTURE_WRAP_T</constant>, and
<constant>GL_TEXTURE_WRAP_R</constant> are accepted.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>params</parameter></term>
<listitem>
<para>Returns the texture parameters.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 xml:id="description">
<title>Description</title>
<para><function>glGetTexParameter</function> and
<function>glGetTextureParameter</function> return in
<parameter>params</parameter> the value or values of the texture parameter
specified as <parameter>pname</parameter>. <parameter>target</parameter>
defines the target texture. <constant>GL_TEXTURE_1D</constant>,
<constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_3D</constant>,
<constant>GL_TEXTURE_1D_ARRAY</constant>,
<constant>GL_TEXTURE_2D_ARRAY</constant>,
<constant>GL_TEXTURE_RECTANGLE</constant>,
<constant>GL_TEXTURE_CUBE_MAP</constant>,
<constant>GL_TEXTURE_CUBE_MAP_ARRAY</constant>,
<constant>GL_TEXTURE_2D_MULTISAMPLE</constant>, or
<constant>GL_TEXTURE_2D_MULTISAMPLE_ARRAY</constant> specify one-, two-,
or three-dimensional, one-dimensional array, two-dimensional array,
rectangle, cube-mapped or cube-mapped array, two-dimensional multisample,
or two-dimensional multisample array texturing, respectively.
<parameter>pname</parameter> accepts the same symbols as
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>,
with the same interpretations:
</para>
<variablelist>
<varlistentry>
<term><constant>GL_DEPTH_STENCIL_TEXTURE_MODE</constant></term>
<listitem>
<para>Returns the single-value depth stencil texture mode, a
symbolic constant. The initial value is
<constant>GL_DEPTH_COMPONENT</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_MAG_FILTER</constant></term>
<listitem>
<para>Returns the single-valued texture magnification filter, a
symbolic constant. The initial value is
<constant>GL_LINEAR</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_MIN_FILTER</constant></term>
<listitem>
<para>Returns the single-valued texture minification filter, a
symbolic constant. The initial value is
<constant>GL_NEAREST_MIPMAP_LINEAR</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_MIN_LOD</constant></term>
<listitem>
<para>
Returns the single-valued texture minimum level-of-detail value. The
initial value is
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<!-- eqn: -1000: -->
<mml:mn>-1000</mml:mn>
</mml:math>
</inlineequation>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_MAX_LOD</constant></term>
<listitem>
<para>Returns the single-valued texture maximum level-of-detail
value. The initial value is 1000.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_BASE_LEVEL</constant></term>
<listitem>
<para>Returns the single-valued base texture mipmap level. The
initial value is 0.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_MAX_LEVEL</constant></term>
<listitem>
<para>Returns the single-valued maximum texture mipmap array level.
The initial value is 1000.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_SWIZZLE_R</constant></term>
<listitem>
<para>Returns the red component swizzle. The initial value is
<constant>GL_RED</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_SWIZZLE_G</constant></term>
<listitem>
<para>Returns the green component swizzle. The initial value is
<constant>GL_GREEN</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_SWIZZLE_B</constant></term>
<listitem>
<para>Returns the blue component swizzle. The initial value is
<constant>GL_BLUE</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_SWIZZLE_A</constant></term>
<listitem>
<para>Returns the alpha component swizzle. The initial value is
<constant>GL_ALPHA</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_SWIZZLE_RGBA</constant></term>
<listitem>
<para>Returns the component swizzle for all channels in a single
query.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_WRAP_S</constant></term>
<listitem>
<para>
Returns the single-valued wrapping function for texture coordinate
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math></inlineequation>,
a symbolic constant. The initial value is <constant>GL_REPEAT</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_WRAP_T</constant></term>
<listitem>
<para>
Returns the single-valued wrapping function for texture coordinate
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">t</mml:mi></mml:math></inlineequation>,
a symbolic constant. The initial value is <constant>GL_REPEAT</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_WRAP_R</constant></term>
<listitem>
<para>
Returns the single-valued wrapping function for texture coordinate
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">r</mml:mi></mml:math></inlineequation>,
a symbolic constant. The initial value is <constant>GL_REPEAT</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_BORDER_COLOR</constant></term>
<listitem>
<para>
Returns four integer or floating-point numbers that comprise the RGBA color
of the texture border.
Floating-point values are returned in the range
<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<!-- eqn: [0,1]: -->
<mml:mfenced open="[" close="]">
<mml:mn>0</mml:mn>
<mml:mn>1</mml:mn>
</mml:mfenced>
</mml:math></inlineequation>.
Integer values are returned as a linear mapping of the internal floating-point
representation such that 1.0 maps to the most positive representable
integer 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>
maps to the most negative representable
integer. The initial value is (0, 0, 0, 0).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_COMPARE_MODE</constant></term>
<listitem>
<para>Returns a single-valued texture comparison mode, a symbolic
constant. The initial value is <constant>GL_NONE</constant>. See
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_COMPARE_FUNC</constant></term>
<listitem>
<para>Returns a single-valued texture comparison function, a
symbolic constant. The initial value is
<constant>GL_LEQUAL</constant>. See
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_VIEW_MIN_LEVEL</constant></term>
<listitem>
<para>Returns a single-valued base level of a texture view
relative to its parent. The initial value is 0. See
<citerefentry><refentrytitle>glTextureView</refentrytitle></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_VIEW_NUM_LEVELS</constant></term>
<listitem>
<para>Returns a single-valued number of levels of detail of a
texture view. See
<citerefentry><refentrytitle>glTextureView</refentrytitle></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_VIEW_MIN_LAYER</constant></term>
<listitem>
<para>Returns a single-valued first level of a texture array view
relative to its parent. See
<citerefentry><refentrytitle>glTextureView</refentrytitle></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_VIEW_NUM_LAYERS</constant></term>
<listitem>
<para>Returns a single-valued number of layers in a texture array
view. See
<citerefentry><refentrytitle>glTextureView</refentrytitle></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_IMMUTABLE_LEVELS</constant></term>
<listitem>
<para>Returns a single-valued number of immutable texture levels
in a texture view. See
<citerefentry><refentrytitle>glTextureView</refentrytitle></citerefentry>.
</para>
</listitem>
</varlistentry>
</variablelist>
<para>In addition to the parameters that may be set with
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>,
<function>glGetTexParameter</function> and
<function>glGetTextureParameter</function> accept the following
read-only parameters:</para>
<variablelist>
<varlistentry>
<term><constant>GL_IMAGE_FORMAT_COMPATIBILITY_TYPE</constant></term>
<listitem>
<para>Returns the matching criteria use for the texture when used as
an image texture. Can return
<constant>GL_IMAGE_FORMAT_COMPATIBILITY_BY_SIZE</constant>,
<constant>GL_IMAGE_FORMAT_COMPATIBILITY_BY_CLASS</constant> or
<constant>GL_NONE</constant>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant></term>
<listitem>
<para>Returns non-zero if the texture has an immutable format.
Textures become immutable if their storage is specified with
<citerefentry><refentrytitle>glTexStorage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexStorage2D</refentrytitle></citerefentry>
or
<citerefentry><refentrytitle>glTexStorage3D</refentrytitle></citerefentry>.
The initial value is <constant>GL_FALSE</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>GL_TEXTURE_TARGET</constant></term>
<listitem>
<para>Returns the effective target of the texture object. For
<function>glGetTex*Parameter</function> functions, this is the
target parameter. For <function>glGetTextureParameter*</function>,
it is the target to which the texture was initially bound when it
was created, or the value of the target parameter to the call to
<function>glCreateTextures</function> which created the
texture.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 xml:id="notes">
<title>Notes</title>
<para>If an error is generated, no change is made to the contents of
<parameter>params</parameter>.</para>
<para><constant>GL_IMAGE_FORMAT_COMPATIBILITY_TYPE</constant> is available
only if the GL version is 4.2 or greater.</para>
<para><constant>GL_DEPTH_STENCIL_TEXTURE_MODE</constant>,
<constant>GL_TEXTURE_VIEW_MIN_LEVEL</constant>,
<constant>GL_TEXTURE_VIEW_NUM_LEVELS</constant>,
<constant>GL_TEXTURE_VIEW_MIN_LAYER</constant>,
<constant>GL_TEXTURE_VIEW_NUM_LAYERS</constant> and
<constant>GL_TEXTURE_IMMUTABLE_LEVELS</constant> are available only if the
GL version is 4.3 or greater.</para>
<para><constant>GL_TEXTURE_TARGET</constant> are available only if the GL
version is 4.5 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_ENUM</constant> error is generated by
<function>glGetTexParameter</function> if the effective
<parameter>target</parameter> is not one of the accepted texture
targets.</para>
<para><constant>GL_INVALID_OPERATION</constant> is generated by
<function>glGetTextureParameter*</function> if
<parameter>texture</parameter> is not the name of an existing texture
object.</para>
</refsect1>
<refsect1 xml:id="versions"><title>Version Support</title>
<informaltable>
<tgroup cols="13" align="left">
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry><function>glGetTexParameterIiv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='30']/*)"/>
</row>
<row>
<entry><function>glGetTexParameterIuiv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='30']/*)"/>
</row>
<row>
<entry><function>glGetTexParameterfv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='20']/*)"/>
</row>
<row>
<entry><function>glGetTexParameteriv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='20']/*)"/>
</row>
<row>
<entry><function>glGetTextureParameterIiv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='45']/*)"/>
</row>
<row>
<entry><function>glGetTextureParameterIuiv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='45']/*)"/>
</row>
<row>
<entry><function>glGetTextureParameterfv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='45']/*)"/>
</row>
<row>
<entry><function>glGetTextureParameteriv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='45']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso">
<title>See Also</title>
<para>
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>,
<!-- FIX: link to glTexParameter --> <function>glTextureParameter</function>,
<citerefentry><refentrytitle>glTexStorage1D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexStorage2D</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexStorage3D</refentrytitle></citerefentry>,
<!-- FIX: link to glTexStorage1D --> <function>glTextureStorage1D</function>,
<!-- FIX: link to glTexStorage2D --> <function>glTextureStorage2D</function>,
<!-- FIX: link to glTexStorage3D --> <function>glTextureStorage3D</function>,
<citerefentry><refentrytitle>glTextureView</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>
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