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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>glGetFramebufferParameter - 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="glGetFramebufferParameter"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetFramebufferParameter — retrieve a named parameter from a framebuffer</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">glGetFramebufferParameteriv</b>(</code></td><td>GLenum </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLint * </td><td><var class="pdparam">params</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>target</code></em></span></dt><dd><p> | |
5 | The target of the operation, which must be <code class="constant">GL_READ_FRAMEBUFFER</code>, | |
6 | <code class="constant">GL_DRAW_FRAMEBUFFER</code> or <code class="constant">GL_FRAMEBUFFER</code>. | |
7 | </p></dd><dt><span class="term"><em class="parameter"><code>pname</code></em></span></dt><dd><p> | |
8 | A token indicating the parameter to be retrieved. | |
9 | </p></dd><dt><span class="term"><em class="parameter"><code>params</code></em></span></dt><dd><p> | |
10 | The address of a variable to receive the value of the parameter named <em class="parameter"><code>pname</code></em>. | |
11 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
12 | <code class="function">glGetFramebufferParameter</code> retrieves the current value of the parameter | |
13 | named <em class="parameter"><code>pname</code></em> from the framebuffer bound to <em class="parameter"><code>target</code></em>. | |
14 | <em class="parameter"><code>target</code></em> must be <code class="constant">GL_READ_FRAMEBFUFFER</code>, | |
15 | <code class="constant">GL_DRAW_FRAMEBUFFER</code> or <code class="constant">GL_FRAMEBUFFER</code>. The | |
16 | token <code class="constant">GL_FRAMEBUFFER</code> is treated as <code class="constant">GL_DRAW_FRAMEBUFFER</code>. | |
17 | A non-default framebuffer must be bound to <em class="parameter"><code>target</code></em>. | |
18 | </p><p> | |
19 | <em class="parameter"><code>pname</code></em> specifies the parameter to be retrieved. The values retrieved from | |
20 | the framebuffer are written into the variable whose address is given by <em class="parameter"><code>params</code></em>. | |
21 | The following symbols are accepted in <em class="parameter"><code>pname</code></em>: | |
22 | </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GL_FRAMEBUFFER_DEFAULT_WIDTH</code></span></dt><dd><p> | |
23 | The value of <code class="constant">GL_FRAMEBUFFER_DEFAULT_WIDTH</code> for the framebuffer is written to the | |
24 | single integer variable whose address is given by <em class="parameter"><code>params</code></em>. | |
25 | </p></dd><dt><span class="term"><code class="constant">GL_FRAMEBUFFER_DEFAULT_HEIGHT</code></span></dt><dd><p> | |
26 | The value of <code class="constant">GL_FRAMEBUFFER_DEFAULT_HEIGHT</code> for the framebuffer is written to the | |
27 | single integer variable whose address is given by <em class="parameter"><code>params</code></em>. | |
28 | </p></dd><dt><span class="term"><code class="constant">GL_FRAMEBUFFER_DEFAULT_LAYERS</code></span></dt><dd><p> | |
29 | The value of <code class="constant">GL_FRAMEBUFFER_DEFAULT_LAYERS</code> for the framebuffer is written to the | |
30 | single integer variable whose address is given by <em class="parameter"><code>params</code></em>. | |
31 | </p></dd><dt><span class="term"><code class="constant">GL_FRAMEBUFFER_DEFAULT_SAMPLES</code></span></dt><dd><p> | |
32 | The value of <code class="constant">GL_FRAMEBUFFER_DEFAULT_SAMPLES</code> for the framebuffer is written to the | |
33 | single integer variable whose address is given by <em class="parameter"><code>params</code></em>. | |
34 | </p></dd><dt><span class="term"><code class="constant">GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS</code></span></dt><dd><p> | |
35 | If the value of <code class="constant">GL_FRAMEBUFFER_DEFAULT_FIXED_SAMPLE_LOCATIONS</code> for the framebuffer is <code class="constant">GL_TRUE</code> | |
36 | then the single integer variable whose address is in <em class="parameter"><code>params</code></em> is set to one, | |
37 | otherwise it is set to zero. | |
38 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
39 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>target</code></em> is not one of the accepted | |
40 | framebuffer targets. | |
41 | </p><p> | |
42 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>pname</code></em> is not one of the accepted | |
43 | parameter names. | |
44 | </p><p> | |
45 | <code class="constant">GL_INVALID_OPERATION</code> is generated if the default framebuffer is bound to <em class="parameter"><code>target</code></em>. | |
46 | </p><p> | |
47 | <em class="parameter"><code>params</code></em> should be the address of a variable to which the client has write access otherwise | |
48 | undefined behavior, including process termination may occur. | |
49 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
50 | <a href="glGetFramebufferParameteriv.xml"><span class="citerefentry"><span class="refentrytitle">glGetFramebufferParameteriv</span></span></a>. | |
51 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
52 | <a href="glFramebufferParameteri.xml"><span class="citerefentry"><span class="refentrytitle">glFramebufferParameteri</span></span></a>. | |
53 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
54 | Copyright <span class="trademark"></span>© 2012 Khronos Group. | |
55 | This material may be distributed subject to the terms and conditions set forth in | |
56 | the Open Publication License, v 1.0, 8 June 1999. | |
57 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
58 | </p></div></div></body></html> |