2013-10-24 07:03:15 +00:00
|
|
|
<?xml version="1.0" encoding="UTF-8"?>
|
|
|
|
|
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
|
|
|
|
|
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
|
|
|
|
|
<refentry id="glTexStorage2D">
|
2013-11-03 11:43:50 +00:00
|
|
|
<refentryinfo>
|
|
|
|
|
<copyright>
|
|
|
|
|
<year>2011-2013</year>
|
|
|
|
|
<holder>Khronos Group</holder>
|
|
|
|
|
</copyright>
|
|
|
|
|
</refentryinfo>
|
2013-10-24 07:03:15 +00:00
|
|
|
<refmeta>
|
|
|
|
|
<refentrytitle>glTexStorage2D</refentrytitle>
|
|
|
|
|
<manvolnum>3G</manvolnum>
|
|
|
|
|
</refmeta>
|
|
|
|
|
<refnamediv>
|
|
|
|
|
<refname>glTexStorage2D</refname>
|
|
|
|
|
<refpurpose>simultaneously specify storage for all levels of a two-dimensional or one-dimensional array texture</refpurpose>
|
|
|
|
|
</refnamediv>
|
|
|
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
|
|
|
<funcsynopsis>
|
|
|
|
|
<funcprototype>
|
|
|
|
|
<funcdef>void <function>glTexStorage2D</function></funcdef>
|
|
|
|
|
<paramdef>GLenum <parameter>target</parameter></paramdef>
|
|
|
|
|
<paramdef>GLsizei <parameter>levels</parameter></paramdef>
|
|
|
|
|
<paramdef>GLenum <parameter>internalformat</parameter></paramdef>
|
|
|
|
|
<paramdef>GLsizei <parameter>width</parameter></paramdef>
|
|
|
|
|
<paramdef>GLsizei <parameter>height</parameter></paramdef>
|
|
|
|
|
</funcprototype>
|
|
|
|
|
</funcsynopsis>
|
|
|
|
|
</refsynopsisdiv>
|
|
|
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
|
|
|
<variablelist>
|
|
|
|
|
<varlistentry>
|
|
|
|
|
<term><parameter>target</parameter></term>
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>
|
|
|
|
|
Specify the target of the operation. <parameter>target</parameter> must be
|
|
|
|
|
one of <constant>GL_TEXTURE_2D</constant>, <constant>GL_PROXY_TEXTURE_2D</constant>,
|
|
|
|
|
<constant>GL_TEXTURE_1D_ARRAY</constant>, <constant>GL_PROXY_TEXTURE_1D_ARRAY</constant>,
|
|
|
|
|
<constant>GL_TEXTURE_RECTANGLE</constant>, <constant>GL_PROXY_TEXTURE_RECTANGLE</constant>,
|
|
|
|
|
or <constant>GL_PROXY_TEXTURE_CUBE_MAP</constant>.
|
|
|
|
|
</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
</varlistentry>
|
|
|
|
|
<varlistentry>
|
|
|
|
|
<term><parameter>levels</parameter></term>
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>
|
|
|
|
|
Specify the number of texture levels.
|
|
|
|
|
</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
</varlistentry>
|
|
|
|
|
<varlistentry>
|
|
|
|
|
<term><parameter>internalformat</parameter></term>
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>
|
|
|
|
|
Specifies the sized internal format to be used to store texture image data.
|
|
|
|
|
</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
</varlistentry>
|
|
|
|
|
<varlistentry>
|
|
|
|
|
<term><parameter>width</parameter></term>
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>
|
|
|
|
|
Specifies the width of the texture, in texels.
|
|
|
|
|
</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
</varlistentry>
|
|
|
|
|
<varlistentry>
|
|
|
|
|
<term><parameter>height</parameter></term>
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>
|
|
|
|
|
Specifies the height of the texture, in texels.
|
|
|
|
|
</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
</varlistentry>
|
|
|
|
|
</variablelist>
|
|
|
|
|
</refsect1>
|
|
|
|
|
<refsect1 id="description"><title>Description</title>
|
|
|
|
|
<para>
|
|
|
|
|
<function>glTexStorage2D</function> specifies the storage requirements for all levels
|
|
|
|
|
of a two-dimensional texture or one-dimensional texture array simultaneously. Once a texture is specified with this
|
|
|
|
|
command, the format and dimensions of all levels become immutable unless it is a proxy
|
|
|
|
|
texture. The contents of the image may still be modified, however, its storage requirements
|
|
|
|
|
may not change. Such a texture is referred to as an <emphasis>immutable-format</emphasis>
|
|
|
|
|
texture.
|
|
|
|
|
</para>
|
|
|
|
|
<para>
|
|
|
|
|
The behavior of <function>glTexStorage2D</function> depends on the <parameter>target</parameter> parameter.
|
|
|
|
|
When <parameter>target</parameter> is <constant>GL_TEXTURE_2D</constant>, <constant>GL_PROXY_TEXTURE_2D</constant>,
|
|
|
|
|
<constant>GL_TEXTURE_RECTANGLE</constant>, <constant>GL_PROXY_TEXTURE_RECTANGLE</constant> or <constant>GL_PROXY_TEXTURE_CUBE_MAP</constant>,
|
|
|
|
|
calling <function>glTexStorage2D</function> is equivalent, assuming no errors are generated,
|
|
|
|
|
to executing the following pseudo-code:
|
|
|
|
|
</para>
|
|
|
|
|
<programlisting><![CDATA[ for (i = 0; i < levels; i++)
|
|
|
|
|
{
|
|
|
|
|
glTexImage2D(target, i, internalformat, width, height, 0, format, type, NULL);
|
|
|
|
|
width = max(1, (width / 2));
|
|
|
|
|
height = max(1, (height / 2));
|
|
|
|
|
}]]></programlisting>
|
|
|
|
|
<para>
|
|
|
|
|
When <parameter>target</parameter> is <constant>GL_TEXTURE_CUBE_MAP</constant>, <function>glTexStorage2D</function>
|
|
|
|
|
is equivalent to:
|
|
|
|
|
</para>
|
|
|
|
|
<programlisting><![CDATA[ for (i = 0; i < levels; i++)
|
|
|
|
|
{
|
|
|
|
|
for (face in (+X, -X, +Y, -Y, +Z, -Z))
|
|
|
|
|
{
|
|
|
|
|
glTexImage2D(face, i, internalformat, width, height, 0, format, type, NULL);
|
|
|
|
|
}
|
|
|
|
|
width = max(1, (width / 2));
|
|
|
|
|
height = max(1, (height / 2));
|
|
|
|
|
}]]></programlisting>
|
|
|
|
|
<para>
|
|
|
|
|
When <parameter>target</parameter> is <constant>GL_TEXTURE_1D</constant> or <constant>GL_TEXTURE_1D_ARRAY</constant>,
|
|
|
|
|
<function>glTexStorage2D</function> is equivalent to:
|
|
|
|
|
</para>
|
|
|
|
|
<programlisting><![CDATA[ for (i = 0; i < levels; i++)
|
|
|
|
|
{
|
|
|
|
|
glTexImage2D(target, i, internalformat, width, height, 0, format, type, NULL);
|
|
|
|
|
width = max(1, (width / 2));
|
|
|
|
|
}]]></programlisting>
|
|
|
|
|
<para>
|
|
|
|
|
Since no texture data is actually provided, the values used in the pseudo-code
|
|
|
|
|
for <parameter>format</parameter> and <parameter>type</parameter> are
|
|
|
|
|
irrelevant and may be considered to be any values that are legal for the
|
|
|
|
|
chosen <parameter>internalformat</parameter> enumerant. <parameter>internalformat</parameter>
|
|
|
|
|
must be one of the sized internal formats given in Table 1 below, one of the sized depth-component
|
|
|
|
|
formats <constant>GL_DEPTH_COMPONENT32F</constant>, <constant>GL_DEPTH_COMPONENT24</constant>, or
|
|
|
|
|
<constant>GL_DEPTH_COMPONENT16</constant>, one of the combined depth-stencil formats,
|
|
|
|
|
<constant>GL_DEPTH32F_STENCIL8</constant>, or <constant>GL_DEPTH24_STENCIL8</constant>, or the
|
|
|
|
|
stencil-only format, <constant>GL_STENCIL_INDEX8</constant>. Upon success,
|
|
|
|
|
the value of <constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant> becomes
|
|
|
|
|
<constant>GL_TRUE</constant>. The value of <constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant>
|
|
|
|
|
may be discovered by calling <citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>
|
|
|
|
|
with <parameter>pname</parameter> set to <constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant>.
|
|
|
|
|
No further changes to the dimensions or format of the texture object may be
|
|
|
|
|
made. Using any command that might alter the dimensions or format of the
|
|
|
|
|
texture object (such as <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry> or
|
|
|
|
|
another call to <function>glTexStorage2D</function>) will result in the
|
|
|
|
|
generation of a <constant>GL_INVALID_OPERATION</constant> error, even if it
|
|
|
|
|
would not, in fact, alter the dimensions or format of the object.
|
|
|
|
|
</para>
|
|
|
|
|
<para>
|
|
|
|
|
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="internalformattable.xml" />
|
|
|
|
|
</para>
|
|
|
|
|
</refsect1>
|
|
|
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
|
|
|
<para>
|
|
|
|
|
<constant>GL_STENCIL_INDEX8</constant> is accepted for <parameter>internalformat</parameter>
|
|
|
|
|
only if the GL version is 4.4 or higher.
|
|
|
|
|
</para>
|
|
|
|
|
</refsect1>
|
|
|
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
|
|
|
<para>
|
|
|
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>internalformat</parameter> is not a
|
|
|
|
|
valid sized internal format.
|
|
|
|
|
</para>
|
|
|
|
|
<para>
|
|
|
|
|
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not
|
|
|
|
|
one of the accepted target enumerants.
|
|
|
|
|
</para>
|
|
|
|
|
<para>
|
|
|
|
|
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>width</parameter> or <parameter>levels</parameter>
|
|
|
|
|
are less than 1.
|
|
|
|
|
</para>
|
|
|
|
|
<para>
|
|
|
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>target</parameter> is <constant>GL_TEXTURE_1D_ARRAY</constant>
|
2013-11-03 11:43:50 +00:00
|
|
|
or <constant>GL_PROXY_TEXTURE_1D_ARRAY</constant> and <parameter>levels</parameter> is greater than
|
|
|
|
|
<inlineequation>
|
|
|
|
|
<mml:math>
|
|
|
|
|
<mml:mrow>
|
|
|
|
|
<mml:mfenced open = '⌊' close = '⌋'>
|
|
|
|
|
<mml:mrow>
|
|
|
|
|
<mml:msub>
|
|
|
|
|
<mml:mi>log</mml:mi>
|
|
|
|
|
<mml:mn>2</mml:mn>
|
|
|
|
|
</mml:msub>
|
|
|
|
|
<mml:mfenced open = '(' close = ')'>
|
|
|
|
|
<mml:mi>width</mml:mi>
|
|
|
|
|
</mml:mfenced>
|
|
|
|
|
</mml:mrow>
|
|
|
|
|
</mml:mfenced>
|
|
|
|
|
<mml:mo>+</mml:mo>
|
|
|
|
|
<mml:mn>1</mml:mn>
|
|
|
|
|
</mml:mrow>
|
|
|
|
|
</mml:math>
|
|
|
|
|
</inlineequation>.
|
2013-10-24 07:03:15 +00:00
|
|
|
</para>
|
|
|
|
|
<para>
|
|
|
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>target</parameter> is not <constant>GL_TEXTURE_1D_ARRAY</constant>
|
2013-11-03 11:43:50 +00:00
|
|
|
or <constant>GL_PROXY_TEXTURE_1D_ARRAY</constant> and <parameter>levels</parameter> is greater than
|
|
|
|
|
<inlineequation>
|
|
|
|
|
<mml:math>
|
|
|
|
|
<mml:mrow>
|
|
|
|
|
<mml:mfenced open = '⌊' close = '⌋'>
|
|
|
|
|
<mml:mrow>
|
|
|
|
|
<mml:msub>
|
|
|
|
|
<mml:mi>log</mml:mi>
|
|
|
|
|
<mml:mn>2</mml:mn>
|
|
|
|
|
</mml:msub>
|
|
|
|
|
<mml:mfenced open = '(' close = ')'>
|
|
|
|
|
<mml:mrow>
|
|
|
|
|
<mml:mi>max</mml:mi>
|
|
|
|
|
<mml:mfenced open = '(' close = ')'>
|
|
|
|
|
<mml:mrow>
|
|
|
|
|
<mml:mi>width</mml:mi>
|
|
|
|
|
<mml:mo>,</mml:mo>
|
|
|
|
|
<mml:mtext fontfamily='Times New Roman'> </mml:mtext>
|
|
|
|
|
<mml:mi>height</mml:mi>
|
|
|
|
|
</mml:mrow>
|
|
|
|
|
</mml:mfenced>
|
|
|
|
|
</mml:mrow>
|
|
|
|
|
</mml:mfenced>
|
|
|
|
|
</mml:mrow>
|
|
|
|
|
</mml:mfenced>
|
|
|
|
|
<mml:mo>+</mml:mo>
|
|
|
|
|
<mml:mn>1</mml:mn>
|
|
|
|
|
</mml:mrow>
|
|
|
|
|
</mml:math>
|
|
|
|
|
</inlineequation>.
|
|
|
|
|
</para>
|
2013-10-24 07:03:15 +00:00
|
|
|
</refsect1>
|
|
|
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
|
|
|
<para>
|
|
|
|
|
<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
|
|
|
|
|
<citerefentry><refentrytitle>glTexStorage1D</refentrytitle></citerefentry>,
|
|
|
|
|
<citerefentry><refentrytitle>glTexStorage3D</refentrytitle></citerefentry>.
|
|
|
|
|
</para>
|
|
|
|
|
</refsect1>
|
|
|
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
|
|
|
<para>
|
2013-11-03 11:43:50 +00:00
|
|
|
Copyright <trademark class="copyright"></trademark> 2011-2013 Khronos Group.
|
|
|
|
|
This material may be distributed subject to the terms and conditions set forth in
|
2013-10-24 07:03:15 +00:00
|
|
|
the Open Publication License, v 1.0, 8 June 1999.
|
|
|
|
|
<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
|
|
|
|
|
</para>
|
|
|
|
|
</refsect1>
|
|
|
|
|
</refentry>
|
