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301 lines
14 KiB
XML
301 lines
14 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="glGetTexParameter">
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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>glGetTexParameter</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetTexParameter</refname>
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<refpurpose>return texture parameter values</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>glGetTexParameterfv</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLfloat * <parameter>params</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>glGetTexParameteriv</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint * <parameter>params</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>target</parameter></term>
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<listitem>
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<para>
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Specifies the symbolic name of the target texture.
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<constant>GL_TEXTURE_2D</constant>,
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<constant>GL_TEXTURE_2D_ARRAY</constant>,
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<constant>GL_TEXTURE_3D</constant>, and
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<constant>GL_TEXTURE_CUBE_MAP</constant>
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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>pname</parameter></term>
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<listitem>
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<para>
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Specifies the symbolic name of a texture parameter.
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<constant>GL_TEXTURE_BASE_LEVEL</constant>,
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<constant>GL_TEXTURE_COMPARE_FUNC</constant>,
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<constant>GL_TEXTURE_COMPARE_MODE</constant>,
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<constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant>,
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<constant>GL_TEXTURE_MAG_FILTER</constant>,
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<constant>GL_TEXTURE_MAX_LEVEL</constant>,
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<constant>GL_TEXTURE_MAX_LOD</constant>,
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<constant>GL_TEXTURE_MIN_FILTER</constant>,
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<constant>GL_TEXTURE_MIN_LOD</constant>,
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<constant>GL_TEXTURE_SWIZZLE_R</constant>,
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<constant>GL_TEXTURE_SWIZZLE_G</constant>,
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<constant>GL_TEXTURE_SWIZZLE_B</constant>,
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<constant>GL_TEXTURE_SWIZZLE_A</constant>,
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<constant>GL_TEXTURE_WRAP_S</constant>,
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<constant>GL_TEXTURE_WRAP_T</constant>, and
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<constant>GL_TEXTURE_WRAP_R</constant>
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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>params</parameter></term>
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<listitem>
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<para>
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Returns the texture parameters.
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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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<function>glGetTexParameter</function> returns in <parameter>params</parameter> the value or values of the texture parameter
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specified as <parameter>pname</parameter>.
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<parameter>target</parameter> defines the target texture.
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<constant>GL_TEXTURE_2D</constant>,
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<constant>GL_TEXTURE_3D</constant>,
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<constant>GL_TEXTURE_2D_ARRAY</constant>, and
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<constant>GL_TEXTURE_CUBE_MAP</constant>
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specify two- or three-dimensional, two-dimensional array, or cube-mapped texturing, respectively.
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<parameter>pname</parameter> accepts the same symbols as <citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>,
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with the same interpretations:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_TEXTURE_BASE_LEVEL</constant></term>
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<listitem>
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<para>
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Returns the single-valued base texture mipmap level. The initial value is 0.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_COMPARE_FUNC</constant></term>
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<listitem>
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<para>
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Returns a single-valued texture comparison function, a symbolic constant. The
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initial value is <constant>GL_LEQUAL</constant>. See <citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_COMPARE_MODE</constant></term>
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<listitem>
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<para>
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Returns a single-valued texture comparison mode, a symbolic constant. The
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initial value is <constant>GL_NONE</constant>. See <citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant></term>
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<listitem>
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<para>
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Returns a single-value boolean representing the immutability of the texture format and size.
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initial value is <constant>GL_FALSE</constant>. See <citerefentry><refentrytitle>glTexStorage2D</refentrytitle></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_MAG_FILTER</constant></term>
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<listitem>
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<para>
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Returns the single-valued texture magnification filter,
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a symbolic constant. The initial value is <constant>GL_LINEAR</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_MAX_LEVEL</constant></term>
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<listitem>
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<para>
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Returns the single-valued maximum texture mipmap array level. The initial
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value is 1000.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_MAX_LOD</constant></term>
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<listitem>
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<para>
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Returns the single-valued texture maximum level-of-detail value. The
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initial value is 1000.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_MIN_FILTER</constant></term>
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<listitem>
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<para>
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Returns the single-valued texture minification filter,
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a symbolic constant. The initial value is <constant>GL_NEAREST_MIPMAP_LINEAR</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_MIN_LOD</constant></term>
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<listitem>
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<para>
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Returns the single-valued texture minimum level-of-detail value. The
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initial value is
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<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
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<!-- eqn: -1000: -->
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<mml:mn>-1000</mml:mn>
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</mml:math></inlineequation>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_SWIZZLE_R</constant></term>
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<listitem>
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<para>
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Returns the red component swizzle. The initial value is <constant>GL_RED</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_SWIZZLE_G</constant></term>
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<listitem>
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<para>
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Returns the green component swizzle. The initial value is <constant>GL_GREEN</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_SWIZZLE_B</constant></term>
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<listitem>
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<para>
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Returns the blue component swizzle. The initial value is <constant>GL_BLUE</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_SWIZZLE_A</constant></term>
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<listitem>
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<para>
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Returns the alpha component swizzle. The initial value is <constant>GL_ALPHA</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_WRAP_S</constant></term>
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<listitem>
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<para>
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Returns the single-valued wrapping function for texture coordinate
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<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math></inlineequation>,
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a symbolic constant. The initial value is <constant>GL_REPEAT</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_WRAP_T</constant></term>
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<listitem>
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<para>
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Returns the single-valued wrapping function for texture coordinate
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<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">t</mml:mi></mml:math></inlineequation>,
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a symbolic constant. The initial value is <constant>GL_REPEAT</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_TEXTURE_WRAP_R</constant></term>
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<listitem>
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<para>
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Returns the single-valued wrapping function for texture coordinate
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<inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">r</mml:mi></mml:math></inlineequation>,
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a symbolic constant. The initial value is <constant>GL_REPEAT</constant>.
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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="notes"><title>Notes</title>
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<para>
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If an error is generated,
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no change is made to the contents of <parameter>params</parameter>.
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</para>
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</refsect1>
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<refsect1 xml:id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> or <parameter>pname</parameter> is not an
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accepted value.
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</para>
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</refsect1>
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<refsect1 xml:id="versions">
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<title>API Version Support</title>
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<informaltable>
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<tgroup cols="4" align="left">
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
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<tbody>
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<row>
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<entry><function>glGetTexParameterfv</function></entry>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
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</row>
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<row>
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<entry><function>glGetTexParameteriv</function></entry>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 xml:id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexStorage2D</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 1991-2006 Silicon Graphics, Inc.
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Copyright <trademark class="copyright"/> 2010-2014 Khronos Group.
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This document is licensed under the SGI Free Software B License.
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For details, see
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</link>.
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</para>
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</refsect1>
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</refentry>
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