145 lines
7.2 KiB
XML
145 lines
7.2 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="glAreTexturesResident">
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<refmeta>
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<refmetainfo>
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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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</refmetainfo>
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<refentrytitle>glAreTexturesResident</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glAreTexturesResident</refname>
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<refpurpose>determine if textures are loaded in texture memory</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>GLboolean <function>glAreTexturesResident</function></funcdef>
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<paramdef>GLsizei <parameter>n</parameter></paramdef>
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<paramdef>const GLuint * <parameter>textures</parameter></paramdef>
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<paramdef>GLboolean * <parameter>residences</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>n</parameter></term>
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<listitem>
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<para>
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Specifies the number of textures to be 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>textures</parameter></term>
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<listitem>
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<para>
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Specifies an array containing the names of the textures to be 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>residences</parameter></term>
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<listitem>
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<para>
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Specifies an array in which the texture residence status is returned.
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The residence status of a texture named by an element of <parameter>textures</parameter> is
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returned in the corresponding element of <parameter>residences</parameter>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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GL establishes
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a ``working set'' of textures that are resident in texture memory.
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These textures can be bound to a texture target much more efficiently
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than textures that are not resident.
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</para>
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<para>
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<function>glAreTexturesResident</function> queries the texture residence status of the <parameter>n</parameter> textures named by
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the elements of <parameter>textures</parameter>.
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If all the named textures are resident,
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<function>glAreTexturesResident</function> returns <constant>GL_TRUE</constant>,
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and the contents of <parameter>residences</parameter> are undisturbed.
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If not all the named textures are resident, <function>glAreTexturesResident</function> returns <constant>GL_FALSE</constant>,
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and detailed status is returned in the <parameter>n</parameter> elements of <parameter>residences</parameter>.
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If an element of <parameter>residences</parameter> is <constant>GL_TRUE</constant>, then the texture named by
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the corresponding element of <parameter>textures</parameter> is resident.
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</para>
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<para>
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The residence status of a single bound texture may also be queried
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by calling
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<citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry> with the <emphasis>target</emphasis> argument set to the
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target to which the texture is bound, and the <emphasis>pname</emphasis> argument
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set to <constant>GL_TEXTURE_RESIDENT</constant>.
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This is the only way that the residence status of a default texture can be
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queried.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glAreTexturesResident</function> is available only if the GL version is 1.1 or greater.
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</para>
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<para>
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<function>glAreTexturesResident</function> returns the residency status of the textures at the time of
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invocation. It does not guarantee that the textures will remain
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resident at any other time.
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</para>
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<para>
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If textures reside in virtual memory (there is no texture memory), they
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are considered always resident.
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</para>
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<para>
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Some implementations may not load a texture until the first use of
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that texture.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>n</parameter> is negative.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if any element in <parameter>textures</parameter>
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is 0 or does not name a texture. In that case, the function returns
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<constant>GL_FALSE</constant> and the contents of <parameter>residences</parameter> is indeterminate.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glAreTexturesResident</function> is executed
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between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding
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execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry> with parameter name <constant>GL_TEXTURE_RESIDENT</constant>
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retrieves the residence status of a currently bound texture.
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPrioritizeTextures</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>
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</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> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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