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><head><title>glGetTexEnv</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="glGetString.3G.xml" title="glGetString"/><link rel="next" href="glGetTexGen.3G.xml" title="glGetTexGen"/></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">glGetTexEnv</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glGetString.3G.xml">Prev</a> </td><th width="60%" align="center">GL</th><td width="20%" align="right"> <a accesskey="n" href="glGetTexGen.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glGetTexEnv.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glGetTexEnv.3G-name"/><h2>Name</h2><p>glGetTexEnvfv, glGetTexEnviv &#8212; return texture environment parameters</p></div><div class="refsynopsisdiv"><a name="glGetTexEnv.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void <tt>glGetTexEnvfv</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>glGetTexEnviv</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="glGetTexEnv.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glGetTexEnvfv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>pname</tt></i>) &#8594; <i><tt>params</tt></i></code></td></tr><tr><td valign="top"><code><tt>glGetTexEnviv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</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="glGetTexEnv.3G-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>target</tt></i></span></dt><dd>
						Specifies a texture environment. Must be <tt>GL_TEXTURE_ENV</tt>.
					</dd><dt><span class="term"><i><tt>pname</tt></i></span></dt><dd>
						Specifies the symbolic name of a texture environment parameter. Accepted values are
						<tt>GL_TEXTURE_ENV_MODE</tt> and <tt>GL_TEXTURE_ENV_COLOR</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="glGetTexEnv.3G-description"/><h2>Description</h2><p>
			<tt>glGetTexEnv</tt> returns in <i><tt>params</tt></i> selected values of a
			texture environment that was specified with <tt>glTexEnv</tt>.
			<i><tt>target</tt></i> specifies a texture environment. Currently, only one texture environment is defined and
			supported: <tt>GL_TEXTURE_ENV</tt>.
		</p><p>
			<i><tt>pname</tt></i> names a specific texture environment parameter, as follows:
		</p><div class="variablelist"><dl><dt><span class="term"><tt>GL_TEXTURE_ENV_MODE</tt></span></dt><dd>
						<i><tt>params</tt></i> returns the single-valued texture environment mode, a symbolic constant. The
						initial value is <tt>GL_MODULATE</tt>.
					</dd><dt><span class="term"><tt>GL_TEXTURE_ENV_COLOR</tt></span></dt><dd>
						<i><tt>params</tt></i> returns four integer or floating-point values that are the texture
						environment color. Integer values, when requested, are linearly mapped from the internal floating-point
						representation such that 1.0 maps to the most positive representable integer, and -1.0 maps to the most
						negative representable integer. The initial value is (0, 0, 0, 0).
					</dd></dl></div></div><div class="refsect1" lang="en"><a name="glGetTexEnv.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>glGetTexEnv</tt> returns the texture environment parameters for the active texture unit.
		</p></div><div class="refsect1" lang="en"><a name="glGetTexEnv.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 accepted value.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <tt>glGetTexEnv</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="glGetTexEnv.3G-see_also"/><h2>See Also</h2><p>
			<span class="simplelist"><a href="glActiveTextureARB.3G.xml">glActiveTextureARB</a>, <a href="glTexEnv.3G.xml">glTexEnv</a></span>
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