upstream-doc/man4/xhtml/glGetBufferParameter.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>glGetBufferParameteriv - 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="glGetBufferParameteriv"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetBufferParameteriv — return parameters of a buffer object</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">glGetBufferParameteriv</b>(</code></td><td>GLenum  </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLenum  </td><td><var class="pdparam">value</var>, </td></tr><tr><td> </td><td>GLint *  </td><td><var class="pdparam">data</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glGetBufferParameteri64v</b>(</code></td><td>GLenum  </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLenum  </td><td><var class="pdparam">value</var>, </td></tr><tr><td> </td><td>GLint64 *  </td><td><var class="pdparam">data</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                     Specifies the target buffer object.
   6                     The symbolic constant must be
   7                     <code class="constant">GL_ARRAY_BUFFER</code>,
   8                     <code class="constant">GL_ATOMIC_COUNTER_BUFFER</code>,
   9                     <code class="constant">GL_COPY_READ_BUFFER</code>,
  10                     <code class="constant">GL_COPY_WRITE_BUFFER</code>,
  11                     <code class="constant">GL_DRAW_INDIRECT_BUFFER</code>,
  12                     <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code>,
  13                     <code class="constant">GL_ELEMENT_ARRAY_BUFFER</code>,
  14                     <code class="constant">GL_PIXEL_PACK_BUFFER</code>,
  15                     <code class="constant">GL_PIXEL_UNPACK_BUFFER</code>,
  16                     <code class="constant">GL_SHADER_STORAGE_BUFFER</code>,
  17                     <code class="constant">GL_TEXTURE_BUFFER</code>,
  18                     <code class="constant">GL_TRANSFORM_FEEDBACK_BUFFER</code>, or
  19                     <code class="constant">GL_UNIFORM_BUFFER</code>.
  20                 </p></dd><dt><span class="term"><em class="parameter"><code>value</code></em></span></dt><dd><p>
  21                     Specifies the symbolic name of a buffer object parameter.
  22                     Accepted values are <code class="constant">GL_BUFFER_ACCESS</code>, <code class="constant">GL_BUFFER_MAPPED</code>,
  23                     <code class="constant">GL_BUFFER_SIZE</code>, or <code class="constant">GL_BUFFER_USAGE</code>.
  24                 </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
  25                     Returns the requested parameter.
  26                 </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
  27             <code class="function">glGetBufferParameteriv</code> returns in <em class="parameter"><code>data</code></em> a selected parameter of the buffer object
  28             specified by <em class="parameter"><code>target</code></em>.
  29         </p><p>
  30             <em class="parameter"><code>value</code></em> names a specific buffer object parameter, as follows:
  31         </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GL_BUFFER_ACCESS</code></span></dt><dd><p>
  32                         <em class="parameter"><code>params</code></em> returns the access policy set while mapping the buffer object.
  33                         The initial value is <code class="constant">GL_READ_WRITE</code>.
  34                     </p></dd><dt><span class="term"><code class="constant">GL_BUFFER_MAPPED</code></span></dt><dd><p>
  35                         <em class="parameter"><code>params</code></em> returns a flag indicating whether the buffer object is currently
  36                         mapped. The initial value is <code class="constant">GL_FALSE</code>.
  37                     </p></dd><dt><span class="term"><code class="constant">GL_BUFFER_SIZE</code></span></dt><dd><p>
  38                         <em class="parameter"><code>params</code></em> returns the size of the buffer object, measured in bytes.
  39                         The initial value is 0.
  40                     </p></dd><dt><span class="term"><code class="constant">GL_BUFFER_USAGE</code></span></dt><dd><p>
  41                         <em class="parameter"><code>params</code></em> returns the buffer object's usage pattern.  The initial value is
  42                         <code class="constant">GL_STATIC_DRAW</code>.
  43                     </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
  44             If an error is generated,
  45             no change is made to the contents of <em class="parameter"><code>data</code></em>.
  46         </p><p>
  47             The <code class="constant">GL_ATOMIC_COUNTER_BUFER</code> target is available only if the GL version is 4.2 or greater.
  48         </p><p>
  49             The <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code> and <code class="constant">GL_SHADER_STORAGE_BUFFER</code> targets are available only if the GL version is 4.3 or greater.
  50         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
  51             <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>target</code></em> or <em class="parameter"><code>value</code></em> is not an
  52             accepted value.
  53         </p><p>
  54             <code class="constant">GL_INVALID_OPERATION</code> is generated if the reserved buffer object name 0 is bound to <em class="parameter"><code>target</code></em>.
  55         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
  56             <a href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>,
  57             <a href="glBufferData.xml"><span class="citerefentry"><span class="refentrytitle">glBufferData</span></span></a>,
  58             <a href="glMapBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glMapBuffer</span></span></a>,
  59             <a href="glUnmapBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glUnmapBuffer</span></span></a>
  60         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
  61             Copyright <span class="trademark"></span>© 2005 Addison-Wesley.
  62             This material may be distributed subject to the terms and conditions set forth in
  63             the Open Publication License, v 1.0, 8 June 1999.
  64             <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
  65         </p></div></div></body></html>