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1 | <?xml version="1.0" encoding="UTF-8"?> |
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4 | <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glCompressedTexImage2D - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glCompressedTexImage2D"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCompressedTexImage2D — specify a two-dimensional texture image in a compressed format</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glCompressedTexImage2D</b>(</code></td><td>GLenum </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">level</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">internalformat</var>, </td></tr><tr><td> </td><td>GLsizei </td><td><var class="pdparam">width</var>, </td></tr><tr><td> </td><td>GLsizei </td><td><var class="pdparam">height</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">border</var>, </td></tr><tr><td> </td><td>GLsizei </td><td><var class="pdparam">imageSize</var>, </td></tr><tr><td> </td><td>const GLvoid * </td><td><var class="pdparam">data</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>target</code></em></span></dt><dd><p> | |
5 | Specifies the target texture. | |
6 | Must be <code class="constant">GL_TEXTURE_2D</code>, <code class="constant">GL_PROXY_TEXTURE_2D</code>, | |
7 | <code class="constant">GL_TEXTURE_1D_ARRAY</code>, <code class="constant">GL_PROXY_TEXTURE_1D_ARRAY</code>, | |
8 | <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_X</code>, | |
9 | <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_X</code>, | |
10 | <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Y</code>, | |
11 | <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</code>, | |
12 | <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Z</code>, | |
13 | <code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>, or | |
14 | <code class="constant">GL_PROXY_TEXTURE_CUBE_MAP</code>. | |
15 | </p></dd><dt><span class="term"><em class="parameter"><code>level</code></em></span></dt><dd><p> | |
16 | Specifies the level-of-detail number. | |
17 | Level 0 is the base image level. | |
18 | Level <span class="emphasis"><em>n</em></span> is the <span class="emphasis"><em>n</em></span>th mipmap reduction image. | |
19 | </p></dd><dt><span class="term"><em class="parameter"><code>internalformat</code></em></span></dt><dd><p> | |
20 | Specifies the format of the compressed image data stored at address <em class="parameter"><code>data</code></em>. | |
21 | </p></dd><dt><span class="term"><em class="parameter"><code>width</code></em></span></dt><dd><p> | |
22 | Specifies the width of the texture image. | |
23 | All implementations support 2D texture and cube map texture images that are at least 16384 texels wide. | |
24 | </p></dd><dt><span class="term"><em class="parameter"><code>height</code></em></span></dt><dd><p> | |
25 | Specifies the height of the texture image. | |
26 | All implementations support 2D texture and cube map texture images that are at least 16384 texels high. | |
27 | </p></dd><dt><span class="term"><em class="parameter"><code>border</code></em></span></dt><dd><p> | |
28 | This value must be 0. | |
29 | </p></dd><dt><span class="term"><em class="parameter"><code>imageSize</code></em></span></dt><dd><p> | |
30 | Specifies the number of unsigned bytes of image data starting at the | |
31 | address specified by <em class="parameter"><code>data</code></em>. | |
32 | </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p> | |
33 | Specifies a pointer to the compressed image data in memory. | |
34 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
35 | Texturing allows elements of an image array to be read by shaders. | |
36 | </p><p> | |
37 | <code class="function">glCompressedTexImage2D</code> loads a previously defined, and retrieved, compressed two-dimensional | |
38 | texture image if <em class="parameter"><code>target</code></em> is <code class="constant">GL_TEXTURE_2D</code>, or one of the | |
39 | cube map faces such as <code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_X</code>. | |
40 | (see <a href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>). | |
41 | </p><p> | |
42 | If <em class="parameter"><code>target</code></em> is <code class="constant">GL_TEXTURE_1D_ARRAY</code>, <em class="parameter"><code>data</code></em> | |
43 | is treated as an array of compressed 1D textures. | |
44 | </p><p> | |
45 | If <em class="parameter"><code>target</code></em> is <code class="constant">GL_PROXY_TEXTURE_2D</code>, <code class="constant">GL_PROXY_TEXTURE_1D_ARRAY</code> | |
c7b31271 | 46 | or <code class="constant">GL_PROXY_TEXTURE_CUBE_MAP</code>, no data is read from <em class="parameter"><code>data</code></em>, but |
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47 | all of the texture image state is recalculated, checked for consistency, |
48 | and checked against the implementation's capabilities. If the | |
49 | implementation cannot handle a texture of the requested texture size, it | |
50 | sets all of the image state to 0, but does not generate an error (see | |
51 | <a href="glGetError.xml"><span class="citerefentry"><span class="refentrytitle">glGetError</span></span></a>). To query for an entire mipmap array, | |
52 | use an image array level greater than or equal to 1. | |
53 | </p><p> | |
54 | <em class="parameter"><code>internalformat</code></em> must be a known compressed image format (such as <code class="constant">GL_RGTC</code>) | |
55 | or an extension-specified compressed-texture format. | |
56 | When a texture is loaded with <a href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a> using a generic compressed | |
57 | texture format (e.g., <code class="constant">GL_COMPRESSED_RGB</code>), the GL selects from one of | |
58 | its extensions supporting compressed textures. In order to load the | |
59 | compressed texture image using <code class="function">glCompressedTexImage2D</code>, query the compressed texture image's | |
60 | size and format using <a href="glGetTexLevelParameter.xml"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a>. | |
61 | </p><p> | |
62 | If a non-zero named buffer object is bound to the <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target | |
63 | (see <a href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>) while a texture image is | |
64 | specified, <em class="parameter"><code>data</code></em> is treated as a byte offset into the buffer object's data store. | |
65 | </p><p> | |
66 | If the compressed data are arranged into fixed-size blocks of texels, the pixel | |
67 | storage modes can be used to select a sub-rectangle from a larger containing rectangle. | |
68 | These pixel storage modes operate in the same way as they do for <a href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>. | |
69 | In the following description, denote by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:mrow></mml:math>, | |
70 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math>, | |
71 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>h</mml:mi></mml:msub></mml:mrow></mml:math>, and | |
72 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>d</mml:mi></mml:msub></mml:mrow></mml:math>, | |
73 | the values of pixel storage modes <code class="constant">GL_UNPACK_COMPRESSED_BLOCK_SIZE</code>, | |
74 | <code class="constant">GL_UNPACK_COMPRESSED_BLOCK_WIDTH</code>, <code class="constant">GL_UNPACK_COMPRESSED_BLOCK_HEIGHT</code>, | |
75 | and <code class="constant">GL_UNPACK_COMPRESSED_BLOCK_DEPTH</code>, respectively. | |
76 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:mrow></mml:math> is | |
77 | the compressed block size in bytes; <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math>, | |
78 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>h</mml:mi></mml:msub></mml:mrow></mml:math>, | |
79 | and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>d</mml:mi></mml:msub></mml:mrow></mml:math> are the compressed block width, height, and depth in pixels. | |
80 | </p><p> | |
81 | By default the pixel storage modes <code class="constant">GL_UNPACK_ROW_LENGTH</code>, | |
82 | <code class="constant">GL_UNPACK_SKIP_ROWS</code>, <code class="constant">GL_UNPACK_SKIP_PIXELS</code>, | |
83 | <code class="constant">GL_UNPACK_IMAGE_HEIGHT</code> and <code class="constant">GL_UNPACK_SKIP_IMAGES</code> | |
84 | are ignored for compressed images. To enable <code class="constant">GL_UNPACK_SKIP_PIXELS</code> | |
85 | and <code class="constant">GL_UNPACK_ROW_LENGTH</code>, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:mrow></mml:math> | |
86 | and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math> must both be non-zero. | |
87 | To also enable <code class="constant">GL_UNPACK_SKIP_ROWS</code> and <code class="constant">GL_UNPACK_IMAGE_HEIGHT</code>, | |
88 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>h</mml:mi></mml:msub></mml:mrow></mml:math> must be non-zero. | |
89 | To also enable <code class="constant">GL_UNPACK_SKIP_IMAGES</code>, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>d</mml:mi></mml:msub></mml:mrow></mml:math> | |
90 | must be non-zero. All parameters must be consistent with the compressed format to produce the desired results. | |
91 | </p><p> | |
92 | When selecting a sub-rectangle from a compressed image: | |
93 | </p><div class="itemizedlist"><ul type="disc"><li>the value of <code class="constant">GL_UNPACK_SKIP_PIXELS</code> must be a multiple of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math>;</li><li>the value of <code class="constant">GL_UNPACK_SKIP_ROWS</code> must be a multiple of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mi>b</mml:mi><mml:mi>w</mml:mi></mml:msub></mml:mrow></mml:math>.</li></ul></div><p> | |
94 | </p><p> | |
95 | <em class="parameter"><code>imageSize</code></em> must be equal to: | |
96 | </p><p> | |
97 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="block" overflow="scroll"> | |
98 | <mml:mrow> | |
99 | <mml:msub> | |
100 | <mml:mi>b</mml:mi> | |
101 | <mml:mi>s</mml:mi> | |
102 | </mml:msub> | |
103 | <mml:mo lspace="2px" rspace="2px">×</mml:mo> | |
104 | <mml:mfenced open="⌈" close="⌉"> | |
105 | <mml:mfrac> | |
106 | <mml:mi>width</mml:mi> | |
107 | <mml:msub> | |
108 | <mml:mi>b</mml:mi> | |
109 | <mml:mi>w</mml:mi> | |
110 | </mml:msub> | |
111 | </mml:mfrac> | |
112 | </mml:mfenced> | |
113 | <mml:mo lspace="2px" rspace="2px">×</mml:mo> | |
114 | <mml:mfenced open="⌈" close="⌉"> | |
115 | <mml:mfrac> | |
116 | <mml:mi>height</mml:mi> | |
117 | <mml:msub> | |
118 | <mml:mi>b</mml:mi> | |
119 | <mml:mi>h</mml:mi> | |
120 | </mml:msub> | |
121 | </mml:mfrac> | |
122 | </mml:mfenced> | |
123 | </mml:mrow> | |
124 | </mml:math> | |
125 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
126 | The specific compressed internal formats <code class="constant">GL_COMPRESSED_RGB8_ETC2</code>, | |
127 | <code class="constant">GL_COMPRESSED_SRGB8_ETC2</code>, | |
128 | <code class="constant">GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2</code>, | |
129 | <code class="constant">GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2</code>, | |
130 | <code class="constant">GL_COMPRESSED_RGBA8_ETC2_EAC</code>, | |
131 | <code class="constant">GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC</code>, | |
132 | <code class="constant">GL_COMPRESSED_R11_EAC</code>, | |
133 | <code class="constant">GL_COMPRESSED_SIGNED_R11_EAC</code>, | |
134 | <code class="constant">GL_COMPRESSED_RG11_EAC</code>, and | |
135 | <code class="constant">GL_COMPRESSED_SIGNED_RG11_EAC</code> are available only if the GL version | |
136 | is 4.3 or higher. | |
137 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
138 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>internalformat</code></em> is not one of the specific | |
139 | compressed internal formats: | |
140 | <code class="constant">GL_COMPRESSED_RED_RGTC1</code>, | |
141 | <code class="constant">GL_COMPRESSED_SIGNED_RED_RGTC1</code>, | |
142 | <code class="constant">GL_COMPRESSED_RG_RGTC2</code>, | |
143 | <code class="constant">GL_COMPRESSED_SIGNED_RG_RGTC2</code>. | |
144 | <code class="constant">GL_COMPRESSED_RGBA_BPTC_UNORM</code>, | |
145 | <code class="constant">GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM</code>, | |
146 | <code class="constant">GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT</code>, | |
147 | <code class="constant">GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT</code>, | |
148 | <code class="constant">GL_COMPRESSED_RGB8_ETC2</code>, | |
149 | <code class="constant">GL_COMPRESSED_SRGB8_ETC2</code>, | |
150 | <code class="constant">GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2</code>, | |
151 | <code class="constant">GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2</code>, | |
152 | <code class="constant">GL_COMPRESSED_RGBA8_ETC2_EAC</code>, | |
153 | <code class="constant">GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC</code>, | |
154 | <code class="constant">GL_COMPRESSED_R11_EAC</code>, | |
155 | <code class="constant">GL_COMPRESSED_SIGNED_R11_EAC</code>, | |
156 | <code class="constant">GL_COMPRESSED_RG11_EAC</code>, or | |
157 | <code class="constant">GL_COMPRESSED_SIGNED_RG11_EAC</code>. | |
158 | </p><p> | |
159 | <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>imageSize</code></em> is not consistent with | |
160 | the format, dimensions, and contents of the specified compressed image | |
161 | data. | |
162 | </p><p> | |
163 | <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>border</code></em> is not 0. | |
164 | </p><p> | |
165 | <code class="constant">GL_INVALID_OPERATION</code> is generated if parameter combinations are not | |
166 | supported by the specific compressed internal format as specified in the | |
167 | specific texture compression extension. | |
168 | </p><p> | |
169 | <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the | |
170 | <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and the buffer object's data store is currently mapped. | |
171 | </p><p> | |
172 | <code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero buffer object name is bound to the | |
173 | <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and the data would be unpacked from the buffer | |
174 | object such that the memory reads required would exceed the data store size. | |
175 | </p><p> | |
176 | Undefined results, including abnormal program termination, are generated if | |
177 | <em class="parameter"><code>data</code></em> is not encoded in a manner consistent with the extension | |
178 | specification defining the internal compression format. | |
179 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
180 | <a href="glGetCompressedTexImage.xml"><span class="citerefentry"><span class="refentrytitle">glGetCompressedTexImage</span></span></a> | |
181 | </p><p> | |
182 | <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_TEXTURE_COMPRESSED</code> | |
183 | </p><p> | |
184 | <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PIXEL_UNPACK_BUFFER_BINDING</code> | |
185 | </p><p> | |
186 | <a href="glGetTexLevelParameter.xml"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a> with arguments <code class="constant">GL_TEXTURE_INTERNAL_FORMAT</code> | |
187 | and <code class="constant">GL_TEXTURE_COMPRESSED_IMAGE_SIZE</code> | |
188 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
189 | <a href="glActiveTexture.xml"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>, | |
190 | <a href="glCompressedTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage1D</span></span></a>, | |
191 | <a href="glCompressedTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage3D</span></span></a>, | |
192 | <a href="glCompressedTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage1D</span></span></a>, | |
193 | <a href="glCompressedTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage2D</span></span></a>, | |
194 | <a href="glCompressedTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage3D</span></span></a>, | |
195 | <a href="glCopyTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a>, | |
196 | <a href="glCopyTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage1D</span></span></a>, | |
197 | <a href="glCopyTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>, | |
198 | <a href="glCopyTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>, | |
199 | <a href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>, | |
200 | <a href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>, | |
201 | <a href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>, | |
202 | <a href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>, | |
203 | <a href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, | |
204 | <a href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>, | |
205 | <a href="glTexParameter.xml"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a> | |
206 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
207 | Copyright <span class="trademark"></span>© 1991-2006 | |
208 | Silicon Graphics, Inc. <span class="trademark"></span>© 2011 | |
209 | Khronos Group. This document is licensed under the SGI | |
210 | Free Software B License. For details, see | |
211 | <a href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
212 | </p></div></div></body></html> |