<div class="refentry"><a id="glCopyTexImage1D"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCopyTexImage1D — copy pixels into a 1D texture image</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glCopyTexImage1D</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>GLenum <var class="pdparam">internalformat</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>GLint <var class="pdparam">border</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_1D</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>internalformat</code></em></span></dt><dd><p>

Specifies the internal format of the texture.

Must be one of the following symbolic constants:

<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>,

<code class="constant">GL_COMPRESSED_SRGB_ALPHA</code>.

<code class="constant">GL_DEPTH_COMPONENT</code>,

<code class="constant">GL_DEPTH_COMPONENT16</code>,

<code class="constant">GL_DEPTH_COMPONENT24</code>,

<code class="constant">GL_DEPTH_COMPONENT32</code>,

<code class="constant">GL_RED</code>,

<code class="constant">GL_RG</code>,

<code class="constant">GL_RGB</code>,

<code class="constant">GL_R3_G3_B2</code>,

<code class="constant">GL_RGB4</code>,

<code class="constant">GL_RGB5</code>,

<code class="constant">GL_RGB8</code>,

<code class="constant">GL_RGB10</code>,

<code class="constant">GL_RGB12</code>,

<code class="constant">GL_RGB16</code>,

<code class="constant">GL_RGBA</code>,

<code class="constant">GL_RGBA2</code>,

<code class="constant">GL_RGBA4</code>,

<code class="constant">GL_RGB5_A1</code>,

<code class="constant">GL_RGBA8</code>,

<code class="constant">GL_RGB10_A2</code>,

<code class="constant">GL_RGBA12</code>,

<code class="constant">GL_RGBA16</code>,

<code class="constant">GL_SRGB</code>,

<code class="constant">GL_SRGB8</code>,

<code class="constant">GL_SRGB_ALPHA</code>, or

<code class="constant">GL_SRGB8_ALPHA8</code>.

</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 left corner

of the row 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 image.

The height of the texture image is 1.

</p></dd><dt><span class="term"><em class="parameter"><code>border</code></em></span></dt><dd><p>

Must be 0.

</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>

<code class="function">glCopyTexImage1D</code> defines a one-dimensional texture image with pixels from the current

<code class="constant">GL_READ_BUFFER</code>.

</p><p>

The screen-aligned pixel row with left corner at

<math overflow="scroll">

<mfenced open="(" close=")">

<mi mathvariant="italic">x</mi>

<mi mathvariant="italic">y</mi>

</mfenced>

</math>

and with a length of

<math overflow="scroll">

<mrow>

<mi mathvariant="italic">width</mi>

</mrow>

</math>

defines the texture array

at the mipmap level specified by <em class="parameter"><code>level</code></em>.

<em class="parameter"><code>internalformat</code></em> specifies the internal format of the texture array.

</p><p>

The pixels in the row are processed exactly as if

<a class="citerefentry" href="glReadPixels"><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

<math overflow="scroll">

<mfenced open="[" close="]">

<mn>0</mn>

<mn>1</mn>

</mfenced>

</math>

and then converted to the texture's internal format for storage in the texel

array.

</p><p>

Pixel ordering is such that lower

<math overflow="scroll"><mi mathvariant="italic">x</mi></math>

screen coordinates correspond to

lower texture coordinates.

</p><p>

If any of the pixels within the specified row of the current

<code class="constant">GL_READ_BUFFER</code> are outside the window associated with the current

rendering context, then the values obtained for those pixels are undefined.

</p><p>

<code class="function">glCopyTexImage1D</code> defines a one-dimensional texture image with pixels from the current

<code class="constant">GL_READ_BUFFER</code>.

</p><p>

When <em class="parameter"><code>internalformat</code></em> is one of the sRGB types, the GL does not automatically convert the source pixels to the sRGB color space. In this case, the <code class="function">glPixelMap</code> function can be used to accomplish the conversion.

</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>

1, 2, 3, and 4 are not accepted values for <em class="parameter"><code>internalformat</code></em>.

</p><p>

An image with 0 width indicates a NULL texture.

</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 one of the allowable values.

</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 <em class="parameter"><code>level</code></em> is greater

than

<math overflow="scroll">

<mrow>

<msub><mi mathvariant="italic">log</mi>

<mn>2</mn>

</msub>

<mo>⁢</mo>

<mi mathvariant="italic">max</mi>

</mrow>

</math>,

where

<math overflow="scroll"><mi mathvariant="italic">max</mi></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 <em class="parameter"><code>internalformat</code></em> is not an allowable value.

</p><p>

<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>width</code></em> is less than 0 or greater than

<code class="constant">GL_MAX_TEXTURE_SIZE</code>.

</p><p>

<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>border</code></em> is not 0.

</p><p>

<code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>internalformat</code></em> is

<code class="constant">GL_DEPTH_COMPONENT</code>, <code class="constant">GL_DEPTH_COMPONENT16</code>,

<code class="constant">GL_DEPTH_COMPONENT24</code>, or <code class="constant">GL_DEPTH_COMPONENT32</code> and there is no depth

buffer.

</p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p>

<a class="citerefentry" href="glGetTexImage"><span class="citerefentry"><span class="refentrytitle">glGetTexImage</span></span></a>

</p></div>

{$pipelinestall}{$examples}

<div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>

<a class="citerefentry" href="glCopyTexImage2D"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,

<a class="citerefentry" href="glCopyTexSubImage1D"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage1D</span></span></a>,

<a class="citerefentry" href="glCopyTexSubImage2D"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>,

<a class="citerefentry" href="glPixelStore"><span class="citerefentry"><span class="refentrytitle">glPixelStore</span></span></a>,

<a class="citerefentry" href="glTexImage1D"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>,

<a class="citerefentry" href="glTexImage2D"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>,

<a class="citerefentry" href="glTexSubImage1D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>,

<a class="citerefentry" href="glTexSubImage2D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>,

<a class="citerefentry" href="glTexParameter"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>

</p></div><div class="refsect1"><div id="Copyright"><h2>Copyright</h2><p>

Copyright © 1991-2006

Silicon Graphics, Inc. This document is licensed under the SGI

Free Software B License. For details, see

<a class="ulink" href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.

</p></div></div></div>