<div class="refentry" title="glGetMaterial"><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" title="C Specification"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glGetMaterialfv</b>(</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 class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glGetMaterialxv</b>(</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" title="Parameters"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><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" title="Description"><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><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" title="Notes"><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" title="Errors"><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" title="See Also"><a id="seealso"></a><h2>See Also</h2><p>

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

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

Copyright © 2003-2004

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>