File: gl_SamplePosition.xhtml

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>gl_SamplePosition - OpenGL 4 Reference Pages</title>
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    <header/>
    <div class="refentry" id="gl_SamplePosition">
      <div class="titlepage"/>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>gl_SamplePosition — contains the location of the current sample within the current fragment</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>Declaration</h2>
        <code class="fieldsynopsis"><span class="modifier">in </span><span class="type">vec2 </span><span class="varname">gl_SamplePosition </span>;</code>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p>
            <code class="varname">gl_SamplePosition</code> is a fragment language input variable that contains
            the location within a fragment of the sample currently being processed. The x and y components
            of <code class="varname">gl_SamplePosition</code> contain the sub-pixel coordinate of the current
            sample and will have values in the range 0.0 to 1.0. The sub-pixel coordinates of the center
            of the pixel are always (0.5, 0.5). Any static use of <code class="varname">gl_SamplePosition</code>
            causes the entire fragment shader to be evaluated per-sample rather than per-fragment. When rendering
            to a non-multisample buffer, or if multisample rasterization is disabled, <code class="varname">gl_SamplePosition</code>
            will be (0.5, 0.5).
        </p>
      </div>
      <div class="refsect1" id="versions">
        <h2>Version Support</h2>
        <div class="informaltable">
          <table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
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                <th style="text-align: left; border-right: 2px solid ; ">
                 
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                <th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
                <span class="bold"><strong>OpenGL Shading Language Version</strong></span>
            </th>
              </tr>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>Function Name</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>1.10</strong></span>
            </th>
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                <span class="bold"><strong>1.20</strong></span>
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                <span class="bold"><strong>1.30</strong></span>
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                <span class="bold"><strong>1.40</strong></span>
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                <span class="bold"><strong>1.50</strong></span>
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                <span class="bold"><strong>3.30</strong></span>
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                <span class="bold"><strong>4.00</strong></span>
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                <span class="bold"><strong>4.10</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.20</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.30</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.40</strong></span>
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.50</strong></span>
            </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; ">gl_SamplePosition</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
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                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; ">✔</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1" id="seealso">
        <h2>See Also</h2>
        <p>
            <a class="citerefentry" href="gl_SampleID.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_SampleID</span></span></a>,
            <a class="citerefentry" href="gl_SampleMask.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_SampleMask</span></span></a>,
            <a class="citerefentry" href="gl_FragCoord.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_FragCoord</span></span></a>
        </p>
      </div>
      <div class="refsect1" id="Copyright">
        <h2>Copyright</h2>
        <p>
            Copyright <span class="trademark"/>© 2011-2014 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 class="link" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
        </p>
      </div>
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    <footer/>
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