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83 lines
3.9 KiB
XML
83 lines
3.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glGenerateMipmap">
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<refmeta>
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<refentrytitle>glGenerateMipmap</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGenerateMipmap</refname>
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<refpurpose>generate a complete set of mipmaps for a texture object</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGenerateMipmap</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>target</parameter></term>
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<listitem>
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<para>Specifies the texture target of the active texture unit to which the texture object
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is bound whose mipmaps will be generated. Must be one of the following
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symbolic constants: <constant>GL_TEXTURE_2D</constant> or
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<constant>GL_TEXTURE_CUBE_MAP</constant>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para><function>glGenerateMipmap</function> computes a complete set
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of mipmap arrays derived from the zero level array. Array levels up to and
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including the 1x1 dimension texture image are replaced with the derived arrays,
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regardless of previous contents. The zero level texture image is left unchanged.</para>
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<para>The internal formats of the derived mipmap arrays all match those of
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the zero level texture image. The dimensions of the derived arrays are computed by
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halving the width and height of the zero level texture image, then in turn halving
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the dimensions of each array level until the 1x1 dimension texture image is
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reached.</para>
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<para>The contents of the derived arrays are computed by repeated filtered reduction
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of the zero level array. No particular filter algorithm is required, though a
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box filter is recommended.
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<citerefentry><refentrytitle>glHint</refentrytitle></citerefentry> may be called
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to express a preference for speed or quality of filtering.</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para><constant>GL_INVALID_ENUM</constant> is generated if
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<parameter>target</parameter> is not <constant>GL_TEXTURE_2D</constant> or
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<constant>GL_TEXTURE_CUBE_MAP</constant>.</para>
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<para><constant>GL_INVALID_OPERATION</constant> is generated if
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the texture bound to <parameter>target</parameter> is a cube map, but its
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six faces do not share indentical widths, heights, formats, and types.</para>
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<para><constant>GL_INVALID_OPERATION</constant> is generated if
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either the width or height of the zero level array is not a power of two.</para>
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<para><constant>GL_INVALID_OPERATION</constant> is generated if
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the zero level array is stored in a compressed internal format.</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para><citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glFramebufferTexture2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glHint</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry></para>
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</refsect1>
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<refsect1 id="copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2008 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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