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<?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" /><title>glGetMaterial</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glGetMaterial"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetMaterial — return material parameters values</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">glGetMaterialfv</strong>(</code></td><td>GLenum <var class="pdparam">face</var>, </td></tr><tr><td> </td><td>GLenum <var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLfloat * <var class="pdparam">params</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div><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">glGetMaterialxv</strong>(</code></td><td>GLenum <var class="pdparam">face</var>, </td></tr><tr><td> </td><td>GLenum <var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLfixed * <var class="pdparam">params</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>face</code></em>
                </span></dt><dd><p>
                    Specifies which of the two materials is being
                    queried.
                    <code class="constant">GL_FRONT</code>
                    or
                    <code class="constant">GL_BACK</code> are accepted,
                    representing the front and back materials, respectively.
                    </p></dd><dt><span class="term">
                    <em class="parameter"><code>pname</code></em>
                </span></dt><dd><p>
                    Specifies the material parameter to return.
                    Accepted symbolic names are
                    <code class="constant">GL_AMBIENT</code>,
                    <code class="constant">GL_DIFFUSE</code>,
                    <code class="constant">GL_SPECULAR</code>,
                    <code class="constant">GL_EMISSION</code>, and
                    <code class="constant">GL_SHININESS</code>.
                    </p></dd><dt><span class="term">
                    <em class="parameter"><code>params</code></em>
                </span></dt><dd><p>
                    Returns the requested data.
                    </p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
        <code class="function">glGetMaterial</code>
        returns in <em class="parameter"><code>params</code></em> the value or values of
        parameter <em class="parameter"><code>pname</code></em> of material <em class="parameter"><code>face</code></em>.
        </p><p>Five parameters are defined:</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">
                    <code class="constant">GL_AMBIENT</code>
                </span></dt><dd><p>
                    <em class="parameter"><code>params</code></em>
                    returns four fixed-point or floating-point values that
                    specify the ambient RGBA reflectance of the material.
                    The values are not clamped. The initial ambient reflectance
                    
                    is (0.2, 0.2, 0.2, 1.0).
                    </p></dd><dt><span class="term">
                    <code class="constant">GL_DIFFUSE</code>
                </span></dt><dd><p>
                    <em class="parameter"><code>params</code></em>
                    returns four fixed-point or floating-point values that
                    specify the diffuse RGBA reflectance of the material.
                    The values are not clamped. The initial diffuse reflectance
                    
                    is (0.8, 0.8, 0.8, 1.0).
                    </p></dd><dt><span class="term">
                    <code class="constant">GL_SPECULAR</code>
                </span></dt><dd><p>
                    <em class="parameter"><code>params</code></em>
                    returns four fixed-point or floating-point values that
                    specify the specular RGBA reflectance of the material.
                    The values are not clamped. The initial specular reflectance
                    
                    is (0, 0, 0, 1).
                    </p></dd><dt><span class="term">
                    <code class="constant">GL_EMISSION</code>
                </span></dt><dd><p>
                    <em class="parameter"><code>params</code></em>
                    returns four fixed-point or floating-point values that
                    specify the RGBA emitted light intensity of the material.
                    The values are not clamped. The initial emission intensity
                    
                    is (0, 0, 0, 1).
                    </p></dd><dt><span class="term">
                    <code class="constant">GL_SHININESS</code>
                </span></dt><dd><p>
                    <em class="parameter"><code>params</code></em>
                    returns a single fixed-point or floating-point value that
                    specifies the RGBA specular exponent of the material.
                    The initial specular exponent
                    
                    is 0.
                    </p></dd></dl></div></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>
        If an error is generated, no change is made to the contents
        of <em class="parameter"><code>params</code></em>.
        </p><p>
        In OpenGL ES there is only one material shared by the front and back.
		Therefore querying 
        <code class="constant">GL_FRONT</code>
		and querying 
        <code class="constant">GL_BACK</code>
		will always return the
		same value.
        </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>face</code></em> or <em class="parameter"><code>pname</code></em>
        is not an accepted value.
        </p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
        <a class="citerefentry" href="glMaterial.xml"><span class="citerefentry"><span class="refentrytitle">glMaterial</span></span></a>
        </p></div><div class="refsect1"><a id="copyright"></a><h2>Copyright</h2><p>
            Copyright <span class="trademark"></span>© 2003-2004
            Silicon Graphics, Inc. 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>