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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" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>gl_PointCoord - OpenGL Shading Language (GLSL)</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="gl_PointCoord"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>gl_PointCoord — contains the coordinate of a fragment within a point</p></div><div class="refsynopsisdiv"><h2>Declaration</h2><div class="funcsynopsis"><code class="function">in vec2 gl_PointCoord;</code></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
            <code class="function">gl_PointCoord</code> is a fragment language input variable that contains
            the two-dimensional coordinates indicating where within a point primitive the current
            fragment is located. If the current primitive is not a point, then values read
            from <code class="function">gl_PointCoord</code> are undefined.
        </p><p>
            <code class="function">gl_PointCoord.s</code> ranges from 0.0 to 1.0 across the point horizontally
            from left to right. If <code class="constant">GL_POINT_SPRITE_COORD_ORIGIN</code> is
            <code class="constant">GL_LOWER_LEFT</code>, <code class="function">gl_PointCoord.t</code> varies
            from 0.0 to 1.0 vertically from bottom to top. Otherwise, if <code class="constant">GL_POINT_SPRITE_COORD_ORIGIN</code>
            is <code class="constant">GL_UPPER_LEFT</code> then <code class="function">gl_PointCoord.t</code> varies
            from 0.0 to 1.0 vertically from top to bottom. The default value of <code class="constant">GL_POINT_SPRITE_COORD_ORIGIN</code>
            is <code class="constant">GL_UPPER_LEFT</code>.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="versions"></a><h2>Version Support</h2><div class="informaltable"><table border="1"><colgroup><col align="left" /><col align="center" /><col align="center" /></colgroup><thead><tr><th align="left"><span class="bold"><strong>
                        Variable
                        </strong></span></th><th align="left"><span class="bold"><strong>
                        Version 1.10
                        </strong></span></th><th align="left"><span class="bold"><strong>
                        Version 1.20
                        </strong></span></th><th align="left"><span class="bold"><strong>
                        Version 1.30
                        </strong></span></th><th align="left"><span class="bold"><strong>
                        Version 1.40
                        </strong></span></th><th align="left"><span class="bold"><strong>
                        Version 1.50
                        </strong></span></th><th align="left"><span class="bold"><strong>
                        Version 3.30
                        </strong></span></th><th align="left"><span class="bold"><strong>
                        Version 4.00
                        </strong></span></th><th align="left"><span class="bold"><strong>
                        Version 4.10
                        </strong></span></th></tr><tr><th align="left">
                            gl_PointCoord
                        </th><th align="center">
                            <span class="emphasis"><em>Y</em></span>
                        </th><th align="center">
                            <span class="emphasis"><em>Y</em></span>
                        </th><th align="center">
                            <span class="emphasis"><em>Y</em></span>
                        </th><th align="center">
                            <span class="emphasis"><em>Y</em></span>
                        </th><th align="center">
                            <span class="emphasis"><em>Y</em></span>
                        </th><th align="center">
                            <span class="emphasis"><em>Y</em></span>
                        </th><th align="center">
                            <span class="emphasis"><em>Y</em></span>
                        </th><th align="center">
                            <span class="emphasis"><em>Y</em></span>
                        </th></tr></thead></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a href="gl_FragCoord.xml"><span class="citerefentry"><span class="refentrytitle">gl_FragCoord</span></span></a>,
            <a href="gl_FragDepth.xml"><span class="citerefentry"><span class="refentrytitle">gl_FragDepth</span></span></a>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
            Copyright <span class="trademark"></span>© 2011 Khronos Group. 
            This material may be distributed subject to the terms and conditions set forth in 
            the Open Publication License, v 1.0, 8 June 1999.
            <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
        </p></div></div></body></html>
