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><head><title>glGetTexGen</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="glGetTexEnv.3G.xml" title="glGetTexEnv"/><link rel="next" href="glGetTexImage.3G.xml" title="glGetTexImage"/></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">glGetTexGen</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glGetTexEnv.3G.xml">Prev</a> </td><th width="60%" align="center">GL</th><td width="20%" align="right"> <a accesskey="n" href="glGetTexImage.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glGetTexGen.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glGetTexGen.3G-name"/><h2>Name</h2><p>glGetTexGendv, glGetTexGenfv, glGetTexGeniv &#8212; return texture coordinate generation parameters</p></div><div class="refsynopsisdiv"><a name="glGetTexGen.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void <tt>glGetTexGendv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLenum <i><tt>coord</tt></i>, GLenum <i><tt>pname</tt></i>, GLdouble *<i><tt>params</tt></i>);</code></td></tr><tr><td valign="top"><code>void <tt>glGetTexGenfv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLenum <i><tt>coord</tt></i>, GLenum <i><tt>pname</tt></i>, GLfloat *<i><tt>params</tt></i>);</code></td></tr><tr><td valign="top"><code>void <tt>glGetTexGeniv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLenum <i><tt>coord</tt></i>, GLenum <i><tt>pname</tt></i>, GLint *<i><tt>params</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glGetTexGen.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glGetTexGendv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>coord</tt></i>, <i><tt>pname</tt></i>) &#8594; <i><tt>params</tt></i></code></td></tr><tr><td valign="top"><code><tt>glGetTexGenfv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>coord</tt></i>, <i><tt>pname</tt></i>) &#8594; <i><tt>params</tt></i></code></td></tr><tr><td valign="top"><code><tt>glGetTexGeniv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>coord</tt></i>, <i><tt>pname</tt></i>) &#8594; <i><tt>params</tt></i></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glGetTexGen.3G-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>coord</tt></i></span></dt><dd>
						Specifies a texture coordinate. Must be <tt>GL_S</tt>, <tt>GL_T</tt>,
						<tt>GL_R</tt>, or <tt>GL_Q</tt>.
					</dd><dt><span class="term"><i><tt>pname</tt></i></span></dt><dd>
						Specifies the symbolic name of the value(s) to be returned. Must be either
						<tt>GL_TEXTURE_GEN_MODE</tt> or the name of one of the texture generation plane equations:
						<tt>GL_OBJECT_PLANE</tt> or <tt>GL_EYE_PLANE</tt>.
					</dd><dt><span class="term"><i><tt>params</tt></i></span></dt><dd>
						Returns the requested data.
					</dd></dl></div></div><div class="refsect1" lang="en"><a name="glGetTexGen.3G-description"/><h2>Description</h2><p>
			<tt>glGetTexGen</tt> returns in <i><tt>params</tt></i> selected parameters of a
			texture coordinate generation function that was specified using <tt>glTexGen</tt>.
			<i><tt>coord</tt></i> names one of the (<i><tt>s</tt></i>, <i><tt>t</tt></i>,
			<i><tt>r</tt></i>, <i><tt>q</tt></i>) texture coordinates, using the symbolic constant
			<tt>GL_S</tt>, <tt>GL_T</tt>, <tt>GL_R</tt>, or <tt>GL_Q</tt>.
		</p><p>
			<i><tt>pname</tt></i> specifies one of three symbolic names:
		</p><div class="variablelist"><dl><dt><span class="term"><tt>GL_TEXTURE_GEN_MODE</tt></span></dt><dd>
						<i><tt>params</tt></i> returns the single-valued texture generation function, a symbolic constant.
						The initial value is <tt>GL_EYE_LINEAR</tt>.
					</dd><dt><span class="term"><tt>GL_OBJECT_PLANE</tt></span></dt><dd>
						<i><tt>params</tt></i> returns the four plane equation coefficients that specify object
						linear-coordinate generation. Integer values, when requested, are mapped directly from the internal
						floating-point representation.
					</dd><dt><span class="term"><tt>GL_EYE_PLANE</tt></span></dt><dd>
						<i><tt>params</tt></i> returns the four plane equation coefficients that specify eye
						linear-coordinate generation. Integer values, when requested, are mapped directly from the internal
						floating-point representation. The returned values are those maintained in eye coordinates. They are not
						equal to the values specified using <tt>glTexGen</tt>, unless the modelview
						matrix was identity when <tt>glTexGen</tt> was called.
					</dd></dl></div></div><div class="refsect1" lang="en"><a name="glGetTexGen.3G-notes"/><h2>Notes</h2><p>
			If an error is generated, no change is made to the contents of <i><tt>params</tt></i>.
		</p><p>
			When the <tt>GL_ARB_multitexture</tt> extension is supported, <tt>glGetTexGen</tt> returns the texture coordinate generation parameters for the active texture
			unit.
		</p></div><div class="refsect1" lang="en"><a name="glGetTexGen.3G-errors"/><h2>Errors</h2><p>
			<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>coord</tt></i> or <i><tt>pname</tt></i> is
			not an accepted value.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <tt>glGetTexGen</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="glGetTexGen.3G-see_also"/><h2>See Also</h2><p>
			<span class="simplelist"><a href="glActiveTextureARB.3G.xml">glActiveTextureARB</a>, <a href="glTexGen.3G.xml">glTexGen</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="glGetTexEnv.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="glGetTexImage.3G.xml">Next</a></td></tr><tr><td width="40%" align="left" valign="top">glGetTexEnv </td><td width="20%" align="center"><a accesskey="h" href="index.xml">Home</a></td><td width="40%" align="right" valign="top"> glGetTexImage</td></tr></table></div></body></html>
