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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> | |
4 | <refentry id="glTexStorage2D"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>2011</year> | |
9 | <holder>Khronos Group</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glTexStorage2D</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glTexStorage2D</refname> | |
17 | <refpurpose>simultaneously specify storage for all levels of a two-dimensional or one-dimensional array texture</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>glTexStorage2D</function></funcdef> | |
23 | <paramdef>GLenum <parameter>target</parameter></paramdef> | |
24 | <paramdef>GLsizei <parameter>levels</parameter></paramdef> | |
25 | <paramdef>GLenum <parameter>internalformat</parameter></paramdef> | |
26 | <paramdef>GLsizei <parameter>width</parameter></paramdef> | |
27 | <paramdef>GLsizei <parameter>height</parameter></paramdef> | |
28 | </funcprototype> | |
29 | </funcsynopsis> | |
30 | </refsynopsisdiv> | |
31 | <refsect1 id="parameters"><title>Parameters</title> | |
32 | <variablelist> | |
33 | <varlistentry> | |
34 | <term><parameter>target</parameter></term> | |
35 | <listitem> | |
36 | <para> | |
37 | Specify the target of the operation. <parameter>target</parameter> must be | |
38 | one of <constant>GL_TEXTURE_2D</constant>, <constant>GL_PROXY_TEXTURE_2D</constant>, | |
39 | <constant>GL_TEXTURE_1D_ARRAY</constant>, <constant>GL_PROXY_TEXTURE_1D_ARRAY</constant>, | |
40 | <constant>GL_TEXTURE_RECTANGLE</constant>, <constant>GL_PROXY_TEXTURE_RECTANGLE</constant>, | |
41 | or <constant>GL_PROXY_TEXTURE_CUBE_MAP</constant>. | |
42 | </para> | |
43 | </listitem> | |
44 | </varlistentry> | |
45 | <varlistentry> | |
46 | <term><parameter>levels</parameter></term> | |
47 | <listitem> | |
48 | <para> | |
49 | Specify the number of texture levels. | |
50 | </para> | |
51 | </listitem> | |
52 | </varlistentry> | |
53 | <varlistentry> | |
54 | <term><parameter>internalformat</parameter></term> | |
55 | <listitem> | |
56 | <para> | |
57 | Specifies the sized internal format to be used to store texture image data. | |
58 | </para> | |
59 | </listitem> | |
60 | </varlistentry> | |
61 | <varlistentry> | |
62 | <term><parameter>width</parameter></term> | |
63 | <listitem> | |
64 | <para> | |
65 | Specifies the width of the texture, in texels. | |
66 | </para> | |
67 | </listitem> | |
68 | </varlistentry> | |
69 | <varlistentry> | |
70 | <term><parameter>height</parameter></term> | |
71 | <listitem> | |
72 | <para> | |
73 | Specifies the height of the texture, in texels. | |
74 | </para> | |
75 | </listitem> | |
76 | </varlistentry> | |
77 | </variablelist> | |
78 | </refsect1> | |
79 | <refsect1 id="description"><title>Description</title> | |
80 | <para> | |
81 | <function>glTexStorage2D</function> specifies the storage requirements for all levels | |
82 | of a two-dimensional texture or one-dimensional texture array simultaneously. Once a texture is specified with this | |
83 | command, the format and dimensions of all levels become immutable unless it is a proxy | |
84 | texture. The contents of the image may still be modified, however, its storage requirements | |
85 | may not change. Such a texture is referred to as an <emphasis>immutable-format</emphasis> | |
86 | texture. | |
87 | </para> | |
88 | <para> | |
89 | The behavior of <function>glTexStorage2D</function> depends on the <parameter>target</parameter> parameter. | |
90 | When <parameter>target</parameter> is <constant>GL_TEXTURE_2D</constant>, <constant>GL_PROXY_TEXTURE_2D</constant>, | |
91 | <constant>GL_TEXTURE_RECTANGLE</constant>, <constant>GL_PROXY_TEXTURE_RECTANGLE</constant> or <constant>GL_PROXY_TEXTURE_CUBE_MAP</constant>, | |
92 | calling <function>glTexStorage2D</function> is equivalent, assuming no errors are generated, | |
93 | to executing the following pseudo-code: | |
94 | </para> | |
95 | <programlisting><![CDATA[ for (i = 0; i < levels; i++) | |
96 | { | |
97 | glTexImage2D(target, i, internalformat, width, height, 0, format, type, NULL); | |
98 | width = max(1, (width / 2)); | |
99 | height = max(1, (height / 2)); | |
100 | }]]></programlisting> | |
101 | <para> | |
102 | When <parameter>target</parameter> is <constant>GL_TEXTURE_CUBE_MAP</constant>, <function>glTexStorage2D</function> | |
103 | is equivalent to: | |
104 | </para> | |
105 | <programlisting><![CDATA[ for (i = 0; i < levels; i++) | |
106 | { | |
107 | for (face in (+X, -X, +Y, -Y, +Z, -Z)) | |
108 | { | |
109 | glTexImage2D(face, i, internalformat, width, height, 0, format, type, NULL); | |
110 | } | |
111 | width = max(1, (width / 2)); | |
112 | height = max(1, (height / 2)); | |
113 | }]]></programlisting> | |
114 | <para> | |
115 | When <parameter>target</parameter> is <constant>GL_TEXTURE_1D</constant> or <constant>GL_TEXTURE_1D_ARRAY</constant>, | |
116 | <function>glTexStorage2D</function> is equivalent to: | |
117 | </para> | |
118 | <programlisting><![CDATA[ for (i = 0; i < levels; i++) | |
119 | { | |
120 | glTexImage2D(target, i, internalformat, width, height, 0, format, type, NULL); | |
121 | width = max(1, (width / 2)); | |
122 | }]]></programlisting> | |
123 | <para> | |
124 | Since no texture data is actually provided, the values used in the pseudo-code | |
125 | for <parameter>format</parameter> and <parameter>type</parameter> are | |
126 | irrelevant and may be considered to be any values that are legal for the | |
127 | chosen <parameter>internalformat</parameter> enumerant. <parameter>internalformat</parameter> | |
128 | must be one of the sized internal formats given in Table 1 below, one of the sized depth-component | |
129 | formats <constant>GL_DEPTH_COMPONENT32F</constant>, <constant>GL_DEPTH_COMPONENT24</constant>, or | |
130 | <constant>GL_DEPTH_COMPONENT16</constant>, or one of the combined depth-stencil formats, | |
131 | <constant>GL_DEPTH32F_STENCIL8</constant>, or <constant>GL_DEPTH24_STENCIL8</constant>. Upon success, | |
132 | the value of <constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant> becomes | |
133 | <constant>GL_TRUE</constant>. The value of <constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant> | |
134 | may be discovered by calling <citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry> | |
135 | with <parameter>pname</parameter> set to <constant>GL_TEXTURE_IMMUTABLE_FORMAT</constant>. | |
136 | No further changes to the dimensions or format of the texture object may be | |
137 | made. Using any command that might alter the dimensions or format of the | |
138 | texture object (such as <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry> or | |
139 | another call to <function>glTexStorage2D</function>) will result in the | |
140 | generation of a <constant>GL_INVALID_OPERATION</constant> error, even if it | |
141 | would not, in fact, alter the dimensions or format of the object. | |
142 | </para> | |
143 | <para> | |
144 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="internalformattable.xml" /> | |
145 | </para> | |
146 | </refsect1> | |
147 | <refsect1 id="errors"><title>Errors</title> | |
148 | <para> | |
149 | <constant>GL_INVALID_ENUM</constant> is generated if <parameter>internalformat</parameter> is not a | |
150 | valid sized internal format. | |
151 | </para> | |
152 | <para> | |
153 | <constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not | |
154 | one of the accepted target enumerants. | |
155 | </para> | |
156 | <para> | |
157 | <constant>GL_INVALID_VALUE</constant> is generated if <parameter>width</parameter> or <parameter>levels</parameter> | |
158 | are less than 1. | |
159 | </para> | |
160 | <para> | |
161 | <constant>GL_INVALID_OPERATION</constant> is generated if <parameter>target</parameter> is <constant>GL_TEXTURE_1D_ARRAY</constant> | |
162 | or <constant>GL_PROXY_TEXTURE_1D_ARRAY</constant> and <parameter>levels</parameter> is greater than <mml:math> | |
163 | <mml:mrow> | |
164 | <mml:mfenced open = '⌊' close = '⌋'> | |
165 | <mml:mrow> | |
166 | <mml:msub> | |
167 | <mml:mi>log</mml:mi> | |
168 | <mml:mn>2</mml:mn> | |
169 | </mml:msub> | |
170 | <mml:mfenced open = '(' close = ')'> | |
171 | <mml:mi>width</mml:mi> | |
172 | </mml:mfenced> | |
173 | </mml:mrow> | |
174 | </mml:mfenced> | |
175 | <mml:mo>+</mml:mo> | |
176 | <mml:mn>1</mml:mn> | |
177 | </mml:mrow> | |
178 | </mml:math>. | |
179 | </para> | |
180 | <para> | |
181 | <constant>GL_INVALID_OPERATION</constant> is generated if <parameter>target</parameter> is not <constant>GL_TEXTURE_1D_ARRAY</constant> | |
182 | or <constant>GL_PROXY_TEXTURE_1D_ARRAY</constant> and <parameter>levels</parameter> is greater than <mml:math> | |
183 | <mml:mrow> | |
184 | <mml:mfenced open = '⌊' close = '⌋'> | |
185 | <mml:mrow> | |
186 | <mml:msub> | |
187 | <mml:mi>log</mml:mi> | |
188 | <mml:mn>2</mml:mn> | |
189 | </mml:msub> | |
190 | <mml:mfenced open = '(' close = ')'> | |
191 | <mml:mrow> | |
192 | <mml:mi>max</mml:mi> | |
193 | <mml:mfenced open = '(' close = ')'> | |
194 | <mml:mrow> | |
195 | <mml:mi>width</mml:mi> | |
196 | <mml:mo>,</mml:mo> | |
197 | <mml:mtext fontfamily='Times New Roman'> </mml:mtext> | |
198 | <mml:mi>height</mml:mi> | |
199 | </mml:mrow> | |
200 | </mml:mfenced> | |
201 | </mml:mrow> | |
202 | </mml:mfenced> | |
203 | </mml:mrow> | |
204 | </mml:mfenced> | |
205 | <mml:mo>+</mml:mo> | |
206 | <mml:mn>1</mml:mn> | |
207 | </mml:mrow> | |
208 | </mml:math>. | |
209 | </para> | |
210 | </refsect1> | |
211 | <refsect1 id="seealso"><title>See Also</title> | |
212 | <para> | |
213 | <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>, | |
214 | <citerefentry><refentrytitle>glTexStorage1D</refentrytitle></citerefentry>, | |
215 | <citerefentry><refentrytitle>glTexStorage3D</refentrytitle></citerefentry>. | |
216 | </para> | |
217 | </refsect1> | |
218 | <refsect1 id="Copyright"><title>Copyright</title> | |
219 | <para> | |
220 | Copyright <trademark class="copyright"></trademark> 2011 Khronos Group. | |
221 | This material may be distributed subject to the terms and conditions set forth in | |
222 | the Open Publication License, v 1.0, 8 June 1999. | |
223 | <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>. | |
224 | </para> | |
225 | </refsect1> | |
226 | </refentry> |