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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>glCompressedTexSubImage2D - OpenGL 4 Reference Pages</title>
<link rel="stylesheet" type="text/css" href="opengl-man.css"/>
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<header/>
<div class="refentry" id="glCompressedTexSubImage2D">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glCompressedTexSubImage2D, glCompressedTextureSubImage2D — specify a two-dimensional texture subimage in a compressed format</p>
</div>
<div class="refsynopsisdiv">
<h2>C Specification</h2>
<div class="funcsynopsis">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glCompressedTexSubImage2D</strong>(</code>
</td>
<td>GLenum <var class="pdparam">target</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLint <var class="pdparam">level</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLint <var class="pdparam">xoffset</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLint <var class="pdparam">yoffset</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLsizei <var class="pdparam">width</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLsizei <var class="pdparam">height</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLenum <var class="pdparam">format</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLsizei <var class="pdparam">imageSize</var>, </td>
</tr>
<tr>
<td> </td>
<td>const GLvoid * <var class="pdparam">data</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glCompressedTextureSubImage2D</strong>(</code>
</td>
<td>GLuint <var class="pdparam">texture</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLint <var class="pdparam">level</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLint <var class="pdparam">xoffset</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLint <var class="pdparam">yoffset</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLsizei <var class="pdparam">width</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLsizei <var class="pdparam">height</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLenum <var class="pdparam">format</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLsizei <var class="pdparam">imageSize</var>, </td>
</tr>
<tr>
<td> </td>
<td>const void *<var class="pdparam">data</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
</div>
<div class="refsect1" id="parameters">
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<em class="parameter">
<code>target</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the target to which the texture is bound for
<code class="function">glCompressedTexSubImage2D</code> function. Must be
<code class="constant">GL_TEXTURE_1D_ARRAY</code>,
<code class="constant">GL_TEXTURE_2D</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_X</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_X</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Y</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Z</code>, or
<code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>texture</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the texture object name for
<code class="function">glCompressedTextureSubImage2D</code> function.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>level</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the level-of-detail number. Level 0 is the base
image level. Level <span class="emphasis"><em>n</em></span> is the
<span class="emphasis"><em>n</em></span>th mipmap reduction image.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>xoffset</code>
</em>
</span>
</dt>
<dd>
<p>Specifies a texel offset in the x direction within the texture
array.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>yoffset</code>
</em>
</span>
</dt>
<dd>
<p>Specifies a texel offset in the y direction within the texture
array.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>width</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the width of the texture subimage.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>height</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the height of the texture subimage.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>format</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the format of the compressed image data stored at
address <em class="parameter"><code>data</code></em>.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>imageSize</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the number of unsigned bytes of image data starting
at the address specified by <em class="parameter"><code>data</code></em>.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>data</code>
</em>
</span>
</dt>
<dd>
<p>Specifies a pointer to the compressed image data in
memory.</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>Texturing allows elements of an image array to be read by
shaders.</p>
<p><code class="function">glCompressedTexSubImage2D</code> and
<code class="function">glCompressedTextureSubImage2D</code> redefine a contiguous
subregion of an existing two-dimensional texture image. The texels
referenced by <em class="parameter"><code>data</code></em> replace the portion of the
existing texture array with x indices <em class="parameter"><code>xoffset</code></em> and
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mrow>
<mml:mi mathvariant="italic">xoffset</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">width</mml:mi>
<mml:mo>-</mml:mo>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:math>,
and the y indices <em class="parameter"><code>yoffset</code></em> and
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mrow>
<mml:mi mathvariant="italic">yoffset</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">height</mml:mi>
<mml:mo>-</mml:mo>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:math>,
inclusive.
This region may not include any texels
outside the range of the texture array as it was originally specified. It
is not an error to specify a subtexture with width of 0, but such a
specification has no effect.</p>
<p><em class="parameter"><code>internalformat</code></em> must be a known compressed
image format (such as <code class="constant">GL_RGTC</code>) or an
extension-specified compressed-texture format. The
<em class="parameter"><code>format</code></em> of the compressed texture image is selected
by the GL implementation that compressed it (see <a class="citerefentry" href="glTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>) and should be queried at the time the texture was
compressed with <a class="citerefentry" href="glGetTexLevelParameter.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a>.</p>
<p>If a non-zero named buffer object is bound to the
<code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target (see <a class="citerefentry" href="glBindBuffer.xhtml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>) while a texture image is specified,
<em class="parameter"><code>data</code></em> is treated as a byte offset into the buffer
object's data store.</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p><code class="constant">GL_INVALID_ENUM</code> is generated if
<em class="parameter"><code>internalformat</code></em> is of the generic compressed
internal formats: <code class="constant">GL_COMPRESSED_RED</code>,
<code class="constant">GL_COMPRESSED_RG</code>,
<code class="constant">GL_COMPRESSED_RGB</code>,
<code class="constant">GL_COMPRESSED_RGBA</code>.
<code class="constant">GL_COMPRESSED_SRGB</code>, or
<code class="constant">GL_COMPRESSED_SRGB_ALPHA</code>.</p>
<p><code class="constant">GL_INVALID_ENUM</code> is generated by
<code class="function">glCompressedTexSubImage2D</code> if
<em class="parameter"><code>target</code></em> is <code class="constant">GL_TEXTURE_RECTANGLE</code>
or <code class="constant">GL_PROXY_TEXTURE_RECTANGLE</code>.</p>
<p><code class="constant">GL_INVALID_VALUE</code> is generated if
<em class="parameter"><code>imageSize</code></em> is not consistent with the format,
dimensions, and contents of the specified compressed image data.</p>
<p><code class="constant">GL_INVALID_OPERATION</code> is generated if parameter
combinations are not supported by the specific compressed internal format
as specified in the specific texture compression extension.</p>
<p><code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero
buffer object name is bound to the
<code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and the buffer object's
data store is currently mapped.</p>
<p><code class="constant">GL_INVALID_OPERATION</code> is generated if a non-zero
buffer object name is bound to the
<code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target and the data would be
unpacked from the buffer object such that the memory reads required would
exceed the data store size.</p>
<p><code class="constant">GL_INVALID_OPERATION</code> is generated by
<code class="function">glCompressedTextureSubImage2D</code> if
<em class="parameter"><code>texture</code></em> is not the name of an existing texture
object.</p>
<p><code class="constant">GL_INVALID_OPERATION</code> is generated by
<code class="function">glCompressedTextureSubImage2D</code> if the effective target
is <code class="constant">GL_TEXTURE_RECTANGLE</code>.</p>
<p>Undefined results, including abnormal program termination, are
generated if <em class="parameter"><code>data</code></em> is not encoded in a manner
consistent with the extension specification defining the internal
compression format.</p>
</div>
<div class="refsect1" id="associatedgets">
<h2>Associated Gets</h2>
<p>
<a class="citerefentry" href="glGetCompressedTexImage.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetCompressedTexImage</span></span></a>
</p>
<p>
<a class="citerefentry" href="glGet.xhtml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_TEXTURE_COMPRESSED</code>
</p>
<p>
<a class="citerefentry" href="glGet.xhtml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PIXEL_UNPACK_BUFFER_BINDING</code>
</p>
<p>
<a class="citerefentry" href="glGetTexLevelParameter.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a> with arguments <code class="constant">GL_TEXTURE_INTERNAL_FORMAT</code>
and <code class="constant">GL_TEXTURE_COMPRESSED_IMAGE_SIZE</code>
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
<colgroup>
<col style="text-align: left; "/>
<col style="text-align: center; " class="firstvers"/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; " class="lastvers"/>
</colgroup>
<thead>
<tr>
<th style="text-align: left; border-right: 2px solid ; ">
</th>
<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
<span class="bold"><strong>OpenGL Version</strong></span>
</th>
</tr>
<tr>
<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>Function / Feature Name</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.4</strong></span>
</th>
<th style="text-align: center; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.5</strong></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="function">glCompressedTexSubImage2D</code>
</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-bottom: 2px solid ; ">✔</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">
<code class="function">glCompressedTextureSubImage2D</code>
</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; ">✔</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="glActiveTexture.xhtml"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>,
<a class="citerefentry" href="glCompressedTexImage1D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage1D</span></span></a>,
<a class="citerefentry" href="glCompressedTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage2D</span></span></a>,
<a class="citerefentry" href="glCompressedTexImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage3D</span></span></a>,
<a class="citerefentry" href="glCompressedTexSubImage1D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage1D</span></span></a>,
<a class="citerefentry" href="glCompressedTexSubImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage3D</span></span></a>,
<a class="citerefentry" href="glCopyTexImage1D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a>,
<a class="citerefentry" href="glCopyTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,
<a class="citerefentry" href="glCopyTexSubImage1D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage1D</span></span></a>,
<a class="citerefentry" href="glCopyTexSubImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>,
<a class="citerefentry" href="glCopyTexSubImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>,
<a class="citerefentry" href="glPixelStore.xhtml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>,
<a class="citerefentry" href="glTexImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>,
<a class="citerefentry" href="glTexImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>,
<a class="citerefentry" href="glTexSubImage1D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>,
<a class="citerefentry" href="glTexSubImage2D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>,
<a class="citerefentry" href="glTexSubImage3D.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>,
<a class="citerefentry" href="glTexParameter.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>
</p>
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<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright <span class="trademark"/>© 1991-2006 Silicon Graphics, Inc.
Copyright <span class="trademark"/>© 2010-2014 Khronos Group.
This document is licensed under the SGI Free Software B License.
For details, see
<a class="link" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
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