upstream-doc/manglsl/xhtml/gl_PointCoord.xml

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   4 <?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>
   5             <code class="function">gl_PointCoord</code> is a fragment language input variable that contains
   6             the two-dimensional coordinates indicating where within a point primitive the current
   7             fragment is located. If the current primitive is not a point, then values read
   8             from <code class="function">gl_PointCoord</code> are undefined.
   9         </p><p>
  10             <code class="function">gl_PointCoord.s</code> ranges from 0.0 to 1.0 across the point horizontally
  11             from left to right. If <code class="constant">GL_POINT_SPRITE_COORD_ORIGIN</code> is
  12             <code class="constant">GL_LOWER_LEFT</code>, <code class="function">gl_PointCoord.t</code> varies
  13             from 0.0 to 1.0 vertically from bottom to top. Otherwise, if <code class="constant">GL_POINT_SPRITE_COORD_ORIGIN</code>
  14             is <code class="constant">GL_UPPER_LEFT</code> then <code class="function">gl_PointCoord.t</code> varies
  15             from 0.0 to 1.0 vertically from top to bottom. The default value of <code class="constant">GL_POINT_SPRITE_COORD_ORIGIN</code>
  16             is <code class="constant">GL_UPPER_LEFT</code>.
  17         </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>
  18                         Variable
  19                         </strong></span></th><th align="left"><span class="bold"><strong>
  20                         Version 1.10
  21                         </strong></span></th><th align="left"><span class="bold"><strong>
  22                         Version 1.20
  23                         </strong></span></th><th align="left"><span class="bold"><strong>
  24                         Version 1.30
  25                         </strong></span></th><th align="left"><span class="bold"><strong>
  26                         Version 1.40
  27                         </strong></span></th><th align="left"><span class="bold"><strong>
  28                         Version 1.50
  29                         </strong></span></th><th align="left"><span class="bold"><strong>
  30                         Version 3.30
  31                         </strong></span></th><th align="left"><span class="bold"><strong>
  32                         Version 4.00
  33                         </strong></span></th><th align="left"><span class="bold"><strong>
  34                         Version 4.10
  35                         </strong></span></th></tr><tr><th align="left">
  36                             gl_PointCoord
  37                         </th><th align="center">
  38                             <span class="emphasis"><em>Y</em></span>
  39                         </th><th align="center">
  40                             <span class="emphasis"><em>Y</em></span>
  41                         </th><th align="center">
  42                             <span class="emphasis"><em>Y</em></span>
  43                         </th><th align="center">
  44                             <span class="emphasis"><em>Y</em></span>
  45                         </th><th align="center">
  46                             <span class="emphasis"><em>Y</em></span>
  47                         </th><th align="center">
  48                             <span class="emphasis"><em>Y</em></span>
  49                         </th><th align="center">
  50                             <span class="emphasis"><em>Y</em></span>
  51                         </th><th align="center">
  52                             <span class="emphasis"><em>Y</em></span>
  53                         </th></tr></thead></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
  54             <a href="gl_FragCoord.xml"><span class="citerefentry"><span class="refentrytitle">gl_FragCoord</span></span></a>,
  55             <a href="gl_FragDepth.xml"><span class="citerefentry"><span class="refentrytitle">gl_FragDepth</span></span></a>
  56         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
  57             Copyright <span class="trademark"></span>© 2011 Khronos Group.
  58             This material may be distributed subject to the terms and conditions set forth in
  59             the Open Publication License, v 1.0, 8 June 1999.
  60             <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
  61         </p></div></div></body></html>