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<?xml version="1.0" encoding="ISO-8859-1"?>
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><head><title>glGetColorTableParameter</title><link rel="stylesheet" href="style.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.59.1"/><link rel="home" href="index.xml" title="PyOpenGL 2.0.1.07 Man Pages"/><link rel="up" href="reference-GL.xml" title="GL"/><link rel="previous" href="glGetColorTable.3G.xml" title="glGetColorTable"/><link rel="next" href="glGetConvolutionFilter.3G.xml" title="glGetConvolutionFilter"/></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">glGetColorTableParameter</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glGetColorTable.3G.xml">Prev</a></td><th width="60%" align="center">GL</th><td width="20%" align="right"><a accesskey="n" href="glGetConvolutionFilter.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glGetColorTableParameter.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glGetColorTableParameter.3G-name"/><h2>Name</h2><p>glGetColorTableParameterfv, glGetColorTableParameteriv — get color lookup table parameters</p></div><div class="refsynopsisdiv"><a name="glGetColorTableParameter.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void<tt>glGetColorTableParameterfv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLenum<i><tt>target</tt></i>, GLenum<i><tt>pname</tt></i>, GLfloat*<i><tt>params</tt></i>);</code></td></tr><tr><td valign="top"><code>void<tt>glGetColorTableParameteriv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLenum<i><tt>target</tt></i>, GLenum<i><tt>pname</tt></i>, GLint*<i><tt>params</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glGetColorTableParameter.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glGetColorTableParameterfv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>pname</tt></i>) →<i><tt>params</tt></i></code></td></tr><tr><td valign="top"><code><tt>glGetColorTableParameteriv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>pname</tt></i>) →<i><tt>params</tt></i></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glGetColorTableParameter.3G-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>target</tt></i></span></dt><dd>
The target color table. Must be <tt>GL_COLOR_TABLE</tt>,
<tt>GL_POST_CONVOLUTION_COLOR_TABLE</tt>,
<tt>GL_POST_COLOR_MATRIX_COLOR_TABLE</tt>, <tt>GL_PROXY_COLOR_TABLE</tt>,
<tt>GL_PROXY_POST_CONVOLUTION_COLOR_TABLE</tt>,
<tt>GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE</tt>.
</dd><dt><span class="term"><i><tt>pname</tt></i></span></dt><dd>
The symbolic name of a color lookup table parameter. Must be one of
<tt>GL_COLOR_TABLE_BIAS</tt>, <tt>GL_COLOR_TABLE_SCALE</tt>,
<tt>GL_COLOR_TABLE_FORMAT</tt>, <tt>GL_COLOR_TABLE_WIDTH</tt>,
<tt>GL_COLOR_TABLE_RED_SIZE</tt>, <tt>GL_COLOR_TABLE_GREEN_SIZE</tt>,
<tt>GL_COLOR_TABLE_BLUE_SIZE</tt>, <tt>GL_COLOR_TABLE_ALPHA_SIZE</tt>,
<tt>GL_COLOR_TABLE_LUMINANCE_SIZE</tt>, or <tt>GL_COLOR_TABLE_INTENSITY_SIZE</tt>.
</dd><dt><span class="term"><i><tt>params</tt></i></span></dt><dd>
A pointer to an array where the values of the parameter will be stored.
</dd></dl></div></div><div class="refsect1" lang="en"><a name="glGetColorTableParameter.3G-description"/><h2>Description</h2><p>
Returns parameters specific to color table <i><tt>target</tt></i>.
</p><p>
When <i><tt>pname</tt></i> is set to <tt>GL_COLOR_TABLE_SCALE</tt> or
<tt>GL_COLOR_TABLE_BIAS</tt>, <tt>glGetColorTableParameter</tt> returns the
color table scale or bias parameters for the table specified by <i><tt>target</tt></i>. For these queries,
<i><tt>target</tt></i> must be set to <tt>GL_COLOR_TABLE</tt>,
<tt>GL_POST_CONVOLUTION_COLOR_TABLE</tt>, or <tt>GL_POST_COLOR_MATRIX_COLOR_TABLE</tt> and
<i><tt>params</tt></i> points to an array of four elements, which receive the scale or bias factors for red,
green, blue, and alpha, in that order.
</p><p>
<tt>glGetColorTableParameter</tt> can also be used to retrieve the and size parameters
for a color table. For these queries, set <i><tt>target</tt></i> to either the color table target or the proxy
color table target. The and size parameters are set by <a href="glColorTable.3G.xml"><tt>glColorTable</tt></a>.
</p><p>
The following table lists the and size parameters that may be queried. For each symbolic constant listed below for
<i><tt>pname</tt></i>, <i><tt>params</tt></i> must point to an array of the given length, and receive the
values indicated.
</p><div class="informaltable"><table border="1"><colgroup><col/><col/><col/></colgroup><tbody><tr><td><span class="bold"><b>Parameter</b></span></td><td align="center"><span class="bold"><b>N</b></span></td><td><span class="bold"><b>Meaning</b></span></td></tr><tr><td><tt>GL_COLOR_TABLE_FORMAT</tt></td><td align="center">1</td><td>Internal (e.g. <tt>GL_RGBA</tt>)</td></tr><tr><td><tt>GL_COLOR_TABLE_WIDTH</tt></td><td align="center">1</td><td>Number of elements in table</td></tr><tr><td><tt>GL_COLOR_TABLE_RED_SIZE</tt></td><td align="center">1</td><td>Size of red component, in bits</td></tr><tr><td><tt>GL_COLOR_TABLE_GREEN_SIZE</tt></td><td align="center">1</td><td>Size of green component</td></tr><tr><td><tt>GL_COLOR_TABLE_BLUE_SIZE</tt></td><td align="center">1</td><td>Size of blue component</td></tr><tr><td><tt>GL_COLOR_TABLE_ALPHA_SIZE</tt></td><td align="center">1</td><td>Size of alpha component</td></tr><tr><td><tt>GL_COLOR_TABLE_LUMINANCE_SIZE</tt></td><td align="center">1</td><td>Size of luminance component</td></tr><tr><td><tt>GL_COLOR_TABLE_INTENSITY_SIZE</tt></td><td align="center">1</td><td>Size of intensity component</td></tr></tbody></table></div></div><div class="refsect1" lang="en"><a name="glGetColorTableParameter.3G-notes"/><h2>Notes</h2><p>
<tt>glGetColorTableParameter</tt> is present only if
<tt>GL_ARB_imaging</tt> is returned when <a href="glGetString.3G.xml"><tt>glGetString</tt></a> is called
with an argument of <tt>GL_EXTENSIONS</tt>.
</p></div><div class="refsect1" lang="en"><a name="glGetColorTableParameter.3G-errors"/><h2>Errors</h2><p>
<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>target</tt></i> or <i><tt>pname</tt></i> is
not an acceptable value.
</p><p>
<tt>GL_INVALID_OPERATION</tt> is generated if <tt>glGetColorTableParameter</tt> is executed between the execution of <a href="glBegin.3G.xml"><tt>glBegin</tt></a> and the corresponding execution of <a href="glBegin.3G.xml"><tt>glEnd</tt></a>.
</p></div><div class="refsect1" lang="en"><a name="glGetColorTableParameter.3G-see_also"/><h2>See Also</h2><p>
<span class="simplelist"><a href="glColorTable.3G.xml">glColorTable</a>, <a href="glTexParameter.3G.xml">glTexParameter</a>, <a href="glColorTableParameter.3G.xml">glColorTableParameter</a></span>
</p></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="glGetColorTable.3G.xml">Prev</a></td><td width="20%" align="center"><a accesskey="u" href="reference-GL.xml">Up</a></td><td width="40%" align="right"><a accesskey="n" href="glGetConvolutionFilter.3G.xml">Next</a></td></tr><tr><td width="40%" align="left" valign="top">glGetColorTable</td><td width="20%" align="center"><a accesskey="h" href="index.xml">Home</a></td><td width="40%" align="right" valign="top">glGetConvolutionFilter</td></tr></table></div></body></html>
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