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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
<?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>glCopyTexSubImage2D - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glCopyTexSubImage2D"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCopyTexSubImage2D — copy a two-dimensional texture subimage</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glCopyTexSubImage2D</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>GLint <var class="pdparam">x</var>, </td></tr><tr><td> </td><td>GLint <var class="pdparam">y</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><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><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 texture.
Must be <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>,
<code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>, or
<code class="constant">GL_TEXTURE_1D_ARRAY</code>.
</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>x</code></em>, </span><span class="term"><em class="parameter"><code>y</code></em></span></dt><dd><p>
Specify the window coordinates of the lower left corner
of the rectangular region of pixels to be copied.
</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></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
<code class="function">glCopyTexSubImage2D</code> replaces a rectangular portion of a two-dimensional texture image,
cube-map texture image or a linear portion of a number of slices of a one-dimensional array texture
with pixels from the current <code class="constant">GL_READ_BUFFER</code>
(rather than from main memory, as is the case for <a class="citerefentry" href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>).
</p><p>
The screen-aligned pixel rectangle with lower left corner at
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mfenced open="(" close=")">
<mml:mi mathvariant="italic">x</mml:mi>
<mml:mi mathvariant="italic">y</mml:mi>
</mml:mfenced>
</mml:math>
and with
width <em class="parameter"><code>width</code></em> and height <em class="parameter"><code>height</code></em> replaces the portion of the
texture array with x indices <em class="parameter"><code>xoffset</code></em> through
<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>,
inclusive, and y indices <em class="parameter"><code>yoffset</code></em> through
<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, at the mipmap level specified by <em class="parameter"><code>level</code></em>.
</p><p>
The pixels in the rectangle are processed exactly as if
<a class="citerefentry" href="glReadPixels.xml"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a> had been called, but the process stops just before
final conversion.
At this point, all pixel component values are clamped to the range
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mfenced open="[" close="]">
<mml:mn>0</mml:mn>
<mml:mn>1</mml:mn>
</mml:mfenced>
</mml:math>
and then converted to the texture's internal format for storage in the texel
array.
</p><p>
The destination rectangle in the texture array may not include any texels
outside the texture array as it was originally specified.
It is not an error to specify a subtexture with zero width or height, but
such a specification has no effect.
</p><p>
When <em class="parameter"><code>target</code></em> is <code class="constant">GL_TEXTURE_1D_ARRAY</code>
then the y coordinate and height are treated as the start slice and number
of slices to modify.
</p><p>
If any of the pixels within the specified rectangle of the current
<code class="constant">GL_READ_BUFFER</code> are outside the read window associated with the current
rendering context, then the values obtained for those pixels are undefined.
</p><p>
No change is made to the <span class="emphasis"><em>internalformat</em></span>, <span class="emphasis"><em>width</em></span>, or
<span class="emphasis"><em>height</em></span>, parameters of the specified texture
array or to texel values outside the specified subregion.
</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>
<a class="citerefentry" href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a> modes affect texture images.
</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
<code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>target</code></em> is not <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>,
<code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>, or
<code class="constant">GL_TEXTURE_1D_ARRAY</code>.
</p><p>
<code class="constant">GL_INVALID_OPERATION</code> is generated if the texture array has not been
defined by a previous <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a> or <a class="citerefentry" href="glCopyTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a> operation.
</p><p>
<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>level</code></em> is less than 0.
</p><p>
<code class="constant">GL_INVALID_VALUE</code> may be generated if
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mrow>
<mml:mi mathvariant="italic">level</mml:mi>
<mml:mo>></mml:mo>
<mml:mrow>
<mml:msub><mml:mi mathvariant="italic">log</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo></mml:mo>
<mml:mfenced open="(" close=")">
<mml:mi mathvariant="italic">max</mml:mi>
</mml:mfenced>
</mml:mrow>
</mml:mrow>
</mml:math>,
where
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">max</mml:mi></mml:math>
is the returned value of <code class="constant">GL_MAX_TEXTURE_SIZE</code>.
</p><p>
<code class="constant">GL_INVALID_VALUE</code> is generated if
<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:mn>0</mml:mn>
</mml:mrow>
</mml:math>,
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mrow>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mi mathvariant="italic">xoffset</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">width</mml:mi>
</mml:mrow>
</mml:mfenced>
<mml:mo>></mml:mo>
<mml:mi mathvariant="italic">w</mml:mi>
</mml:mrow>
</mml:math>,
<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:mn>0</mml:mn>
</mml:mrow>
</mml:math>,
or
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:mrow>
<mml:mfenced open="(" close=")">
<mml:mrow>
<mml:mi mathvariant="italic">yoffset</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="italic">height</mml:mi>
</mml:mrow>
</mml:mfenced>
<mml:mo>></mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>,
where
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">w</mml:mi></mml:math>
is the <code class="constant">GL_TEXTURE_WIDTH</code>,
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">h</mml:mi></mml:math>
is the <code class="constant">GL_TEXTURE_HEIGHT</code> and
of the texture image being modified.
</p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
<a class="citerefentry" href="glGetTexImage.xml"><span class="citerefentry"><span class="refentrytitle">glGetTexImage</span></span></a>
</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glCopyTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage1D</span></span></a>,
<a class="citerefentry" href="glCopyTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,
<a class="citerefentry" href="glCopyTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage1D</span></span></a>,
<a class="citerefentry" href="glCopyTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage3D</span></span></a>,
<a class="citerefentry" href="glPixelStore.xml"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>,
<a class="citerefentry" href="glReadBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glReadBuffer</span></span></a>,
<a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>,
<a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>,
<a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>,
<a class="citerefentry" href="glTexParameter.xml"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>,
<a class="citerefentry" href="glTexSubImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>,
<a class="citerefentry" href="glTexSubImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>,
<a class="citerefentry" href="glTexSubImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>
</p></div><div class="refsect1"><a id="Copyright"></a><h2>Copyright</h2><p>
Copyright <span class="trademark"></span>© 1991-2006
Silicon Graphics, Inc. Copyright <span class="trademark"></span>© 2012-2013 Khronos Group.
This document is licensed under the SGI
Free Software B License. For details, see
<a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
</p></div></div></body></html>
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