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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> | |
3 | <!-- saved from url=(0013)about:internet --> | |
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>glMinSampleShading - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glMinSampleShading"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glMinSampleShading — specifies minimum rate at which sample shaing takes place</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><p><code class="funcdef">void <b class="fsfunc">glMinSampleShading</b>(</code>GLfloat <var class="pdparam">value</var><code>)</code>;</p></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>value</code></em></span></dt><dd><p> | |
5 | Specifies the rate at which samples are shaded within each covered pixel. | |
6 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
7 | <code class="function">glMinSampleShading</code> specifies the rate at which samples are shaded within | |
8 | a covered pixel. Sample-rate shading is enabled by calling <a href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a> | |
9 | with the parameter <code class="constant">GL_SAMPLE_SHADING</code>. If <code class="constant">GL_MULTISAMPLE</code> | |
10 | or <code class="constant">GL_SAMPLE_SHADING</code> is disabled, sample shading has no effect. | |
11 | Otherwise, an implementation must provide at least as many unique color values for | |
12 | each covered fragment as specified by <em class="parameter"><code>value</code></em> times <em class="parameter"><code>samples</code></em> where | |
13 | <em class="parameter"><code>samples</code></em> is the value of <code class="constant">GL_SAMPLES</code> for the current | |
14 | framebuffer. At least 1 sample for each covered fragment is generated. | |
15 | </p><p> | |
16 | A <em class="parameter"><code>value</code></em> of 1.0 indicates that each sample in the framebuffer should be | |
17 | indpendently shaded. A <em class="parameter"><code>value</code></em> of 0.0 effectively allows the GL to ignore | |
18 | sample rate shading. Any value between 0.0 and 1.0 allows the GL to shade only a subset | |
19 | of the total samples within each covered fragment. Which samples are shaded and the algorithm | |
20 | used to select that subset of the fragment's samples is implementation dependent. | |
21 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
22 | The type of the <em class="parameter"><code>value</code></em> parameter was | |
23 | changed from GLclampf to GLfloat. This change is transparent | |
24 | to user code and is described in detail on the | |
25 | <a href="removedTypes.xml"><span class="citerefentry"><span class="refentrytitle">removedTypes</span></span></a> | |
26 | page. | |
27 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
28 | None. | |
29 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
30 | <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MIN_SAMPLE_SHADING</code>. | |
31 | </p><p> | |
32 | <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_SAMPLES</code>. | |
33 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
34 | <a href="removedTypes.xml"><span class="citerefentry"><span class="refentrytitle">removedTypes</span></span></a> | |
35 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
36 | Copyright <span class="trademark"></span>© 2011 Khronos Group. | |
37 | This material may be distributed subject to the terms and conditions set forth in | |
38 | the Open Publication License, v 1.0, 8 June 1999. | |
39 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
40 | </p></div></div></body></html> |