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1 | <?xml version="1.0" encoding="UTF-8"?> |
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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>glGetShaderPrecisionFormat - 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="glGetShaderPrecisionFormat"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetShaderPrecisionFormat — retrieve the range and precision for numeric formats supported by the shader compiler</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glGetShaderPrecisionFormat</b>(</code></td><td>GLenum </td><td><var class="pdparam">shaderType</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">precisionType</var>, </td></tr><tr><td> </td><td>GLint * </td><td><var class="pdparam">range</var>, </td></tr><tr><td> </td><td>GLint * </td><td><var class="pdparam">precision</var><code>)</code>;</td></tr></table></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>shaderType</code></em></span></dt><dd><p> | |
5 | Specifies the type of shader whose precision to query. <em class="parameter"><code>shaderType</code></em> | |
6 | must be <code class="constant">GL_VERTEX_SHADER</code> or <code class="constant">GL_FRAGMENT_SHADER</code>. | |
7 | </p></dd><dt><span class="term"><em class="parameter"><code>precisionType</code></em></span></dt><dd><p> | |
8 | Specifies the numeric format whose precision and range to query. | |
9 | </p></dd><dt><span class="term"><em class="parameter"><code>range</code></em></span></dt><dd><p> | |
10 | Specifies the address of array of two integers into which encodings of the implementation's | |
11 | numeric range are returned. | |
12 | </p></dd><dt><span class="term"><em class="parameter"><code>precision</code></em></span></dt><dd><p> | |
13 | Specifies the address of an integer into which the numeric precision of the implementation | |
14 | is written. | |
15 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
16 | <code class="function">glGetShaderPrecisionFormat</code> retrieves the numeric range and precision for | |
17 | the implementation's representation of quantities in different numeric formats in specified | |
18 | shader type. <em class="parameter"><code>shaderType</code></em> specifies the type of shader for which the numeric | |
19 | precision and range is to be retrieved and must be one of <code class="constant">GL_VERTEX_SHADER</code> | |
20 | or <code class="constant">GL_FRAGMENT_SHADER</code>. <em class="parameter"><code>precisionType</code></em> specifies the | |
21 | numeric format to query and must be one of <code class="constant">GL_LOW_FLOAT</code>, <code class="constant">GL_MEDIUM_FLOAT</code> | |
22 | <code class="constant">GL_HIGH_FLOAT</code>, <code class="constant">GL_LOW_INT</code>, <code class="constant">GL_MEDIUM_INT</code>, | |
23 | or <code class="constant">GL_HIGH_INT</code>. | |
24 | </p><p> | |
25 | <em class="parameter"><code>range</code></em> points to an array of two integers into which the format's numeric range | |
26 | will be returned. If min and max are the smallest values representable in the format, then the values | |
27 | returned are defined to be: <em class="parameter"><code>range</code></em>[0] = floor(log2(|min|)) and | |
28 | <em class="parameter"><code>range</code></em>[1] = floor(log2(|max|)). | |
29 | </p><p> | |
30 | <em class="parameter"><code>precision</code></em> specifies the address of an integer into which will be written | |
31 | the log2 value of the number of bits of precision of the format. If the smallest representable | |
32 | value greater than 1 is 1 + <span class="emphasis"><em>eps</em></span>, then the integer addressed by <em class="parameter"><code>precision</code></em> | |
33 | will contain floor(-log2(eps)). | |
34 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
35 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>shaderType</code></em> or | |
36 | <em class="parameter"><code>precisionType</code></em> is not an accepted value. | |
37 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
38 | Copyright <span class="trademark"></span>© 2010 Khronos Group. | |
39 | This material may be distributed subject to the terms and conditions set forth in | |
40 | the Open Publication License, v 1.0, 8 June 1999. | |
41 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
42 | </p></div></div></body></html> |