<div class="refentry"><a id="glBindBuffer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glBindBuffer — bind a named buffer object</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glBindBuffer</strong>(</code></td><td>GLenum <var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLuint <var class="pdparam">buffer</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>target</code></em></span></dt><dd><p>

Specifies the target to which the buffer object is bound.

The symbolic constant must be

<code class="constant">GL_ARRAY_BUFFER</code>,

<code class="constant">GL_COPY_READ_BUFFER</code>,

<code class="constant">GL_COPY_WRITE_BUFFER</code>,

<code class="constant">GL_ELEMENT_ARRAY_BUFFER</code>,

<code class="constant">GL_PIXEL_PACK_BUFFER</code>,

<code class="constant">GL_PIXEL_UNPACK_BUFFER</code>,

<code class="constant">GL_TEXTURE_BUFFER</code>,

<code class="constant">GL_TRANSFORM_FEEDBACK_BUFFER</code>, or

<code class="constant">GL_UNIFORM_BUFFER</code>.

</p></dd><dt><span class="term"><em class="parameter"><code>buffer</code></em></span></dt><dd><p>

Specifies the name of a buffer object.

</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>

<code class="function">glBindBuffer</code> binds a buffer object to the specified buffer binding point. Calling <code class="function">glBindBuffer</code> with

<em class="parameter"><code>target</code></em> set to one of the accepted symbolic constants and <em class="parameter"><code>buffer</code></em> set to the name

of a buffer object binds that buffer object name to the target. If no buffer object with name <em class="parameter"><code>buffer</code></em>

exists, one is created with that name. When a buffer object is bound to a target, the previous binding for that

target is automatically broken.

</p><p>

Buffer object names are unsigned integers. The value zero is reserved, but

there is no default buffer object for each buffer object target. Instead, <em class="parameter"><code>buffer</code></em> set to zero

effectively unbinds any buffer object previously bound, and restores client memory usage for that buffer object target (if supported for that target).

Buffer object names and the corresponding buffer object contents are local to

the shared object space of the current

GL rendering context;

two rendering contexts share buffer object names only if they

explicitly enable sharing between contexts through the appropriate GL windows interfaces functions.

</p><p>

<a class="citerefentry" href="glGenBuffers"><span class="citerefentry"><span class="refentrytitle">glGenBuffers</span></span></a> must be used to generate a set of unused buffer object names.

</p><p>

The state of a buffer object immediately after it is first bound is an unmapped zero-sized memory buffer with

<code class="constant">GL_READ_WRITE</code> access and <code class="constant">GL_STATIC_DRAW</code> usage.

</p><p>

While a non-zero buffer object name is bound, GL operations on the target to which it is

bound affect the bound buffer object, and queries of the target to which it is bound return state

from the bound buffer object. While buffer object name zero is bound, as in the initial state,

attempts to modify or query state on the target to which it is bound generates an

<code class="constant">GL_INVALID_OPERATION</code> error.

</p><p>

When a non-zero buffer object is bound to the <code class="constant">GL_ARRAY_BUFFER</code> target,

the vertex array pointer parameter is interpreted as an offset within the

buffer object measured in basic machine units.

</p><p>

While a non-zero buffer object is bound to the <code class="constant">GL_ELEMENT_ARRAY_BUFFER</code> target,

the indices parameter of <a class="citerefentry" href="glDrawElements"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>,

<a class="citerefentry" href="glDrawElementsInstanced"><span class="citerefentry"><span class="refentrytitle">glDrawElementsInstanced</span></span></a>,

<a class="citerefentry" href="glDrawElementsBaseVertex"><span class="citerefentry"><span class="refentrytitle">glDrawElementsBaseVertex</span></span></a>,

<a class="citerefentry" href="glDrawRangeElements"><span class="citerefentry"><span class="refentrytitle">glDrawRangeElements</span></span></a>,

<a class="citerefentry" href="glDrawRangeElementsBaseVertex"><span class="citerefentry"><span class="refentrytitle">glDrawRangeElementsBaseVertex</span></span></a>,

<a class="citerefentry" href="glMultiDrawElements"><span class="citerefentry"><span class="refentrytitle">glMultiDrawElements</span></span></a>, or

<a class="citerefentry" href="glMultiDrawElementsBaseVertex"><span class="citerefentry"><span class="refentrytitle">glMultiDrawElementsBaseVertex</span></span></a> is interpreted as an

offset within the buffer object measured in basic machine units.

</p><p>

While a non-zero buffer object is bound to the <code class="constant">GL_PIXEL_PACK_BUFFER</code> target,

the following commands are affected: <a class="citerefentry" href="glGetCompressedTexImage"><span class="citerefentry"><span class="refentrytitle">glGetCompressedTexImage</span></span></a>,

<a class="citerefentry" href="glGetTexImage"><span class="citerefentry"><span class="refentrytitle">glGetTexImage</span></span></a>, and

<a class="citerefentry" href="glReadPixels"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>. The pointer parameter is

interpreted as an offset within the buffer object measured in basic machine units.

</p><p>

While a non-zero buffer object is bound to the <code class="constant">GL_PIXEL_UNPACK_BUFFER</code> target,

the following commands are affected:

<a class="citerefentry" href="glCompressedTexImage1D"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage1D</span></span></a>,

<a class="citerefentry" href="glCompressedTexImage2D"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage2D</span></span></a>,

<a class="citerefentry" href="glCompressedTexImage3D"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage3D</span></span></a>,

<a class="citerefentry" href="glCompressedTexSubImage1D"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage1D</span></span></a>,

<a class="citerefentry" href="glCompressedTexSubImage2D"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage2D</span></span></a>,

<a class="citerefentry" href="glCompressedTexSubImage3D"><span class="citerefentry"><span class="refentrytitle">glCompressedTexSubImage3D</span></span></a>,

<a class="citerefentry" href="glTexImage1D"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>,

<a class="citerefentry" href="glTexImage2D"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>,

<a class="citerefentry" href="glTexImage3D"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>,

<a class="citerefentry" href="glTexSubImage1D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage1D</span></span></a>,

<a class="citerefentry" href="glTexSubImage2D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage2D</span></span></a>, and

<a class="citerefentry" href="glTexSubImage3D"><span class="citerefentry"><span class="refentrytitle">glTexSubImage3D</span></span></a>. The pointer parameter is

interpreted as an offset within the buffer object measured in basic machine units.

</p><p>

The buffer targets <code class="constant">GL_COPY_READ_BUFFER</code> and <code class="constant">GL_COPY_WRITE_BUFFER</code>

are provided to allow <a class="citerefentry" href="glCopyBufferSubData"><span class="citerefentry"><span class="refentrytitle">glCopyBufferSubData</span></span></a>

to be used without disturbing the state of other bindings. However, <a class="citerefentry" href="glCopyBufferSubData"><span class="citerefentry"><span class="refentrytitle">glCopyBufferSubData</span></span></a>

may be used with any pair of buffer binding points.

</p><p>

The <code class="constant">GL_TRANSFORM_FEEDBACK_BUFFER</code> buffer binding point may be passed to <code class="function">glBindBuffer</code>,

but will not directly affect transform feedback state. Instead, the indexed <code class="constant">GL_TRANSFORM_FEEDBACK_BUFFER</code>

bindings must be used through a call to <a class="citerefentry" href="glBindBufferBase"><span class="citerefentry"><span class="refentrytitle">glBindBufferBase</span></span></a>

or <a class="citerefentry" href="glBindBufferRange"><span class="citerefentry"><span class="refentrytitle">glBindBufferRange</span></span></a>. This will affect the generic

<code class="constant">GL_TRANSFORM_FEEDBACK_BUFFER</code> binding.

</p><p>

Likewise, the <code class="constant">GL_UNIFORM_BUFFER</code> buffer binding point may be used, but does not directly affect

uniform buffer state. <a class="citerefentry" href="glBindBufferBase"><span class="citerefentry"><span class="refentrytitle">glBindBufferBase</span></span></a>

or <a class="citerefentry" href="glBindBufferRange"><span class="citerefentry"><span class="refentrytitle">glBindBufferRange</span></span></a> must be used to bind a buffer to

an indexed uniform buffer binding point.

</p><p>

A buffer object binding created with <code class="function">glBindBuffer</code> remains active until a different

buffer object name is bound to the same target, or until the bound buffer object is

deleted with <a class="citerefentry" href="glDeleteBuffers"><span class="citerefentry"><span class="refentrytitle">glDeleteBuffers</span></span></a>.

</p><p>

Once created, a named buffer object may be re-bound to any target as often as needed. However,

the GL implementation may make choices about how to optimize the storage of a buffer object based

on its initial binding target.

</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>

The <code class="constant">GL_COPY_READ_BUFFER</code>, <code class="constant">GL_UNIFORM_BUFFER</code> and

<code class="constant">GL_TEXTURE_BUFFER</code> targets are available only if the GL version is 3.1 or greater.

</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>

<code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>target</code></em> is not one of the allowable

values.

</p><p>

<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>buffer</code></em> is not a name previously returned

from a call to <a class="citerefentry" href="glGenBuffers"><span class="citerefentry"><span class="refentrytitle">glGenBuffers</span></span></a>.

</p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_ARRAY_BUFFER_BINDING</code>

</p><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_COPY_READ_BUFFER_BINDING</code>

</p><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_COPY_WRITE_BUFFER_BINDING</code>

</p><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_ELEMENT_ARRAY_BUFFER_BINDING</code>

</p><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PIXEL_PACK_BUFFER_BINDING</code>

</p><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PIXEL_UNPACK_BUFFER_BINDING</code>

</p><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_TRANSFORM_FEEDBACK_BUFFER_BINDING</code>

</p><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_UNIFORM_BUFFER_BINDING</code>

</p></div>

{$pipelinestall}{$examples}

<div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>

<a class="citerefentry" href="glGenBuffers"><span class="citerefentry"><span class="refentrytitle">glGenBuffers</span></span></a>,

<a class="citerefentry" href="glBindBufferBase"><span class="citerefentry"><span class="refentrytitle">glBindBufferBase</span></span></a>,

<a class="citerefentry" href="glBindBufferRange"><span class="citerefentry"><span class="refentrytitle">glBindBufferRange</span></span></a>,

<a class="citerefentry" href="glMapBuffer"><span class="citerefentry"><span class="refentrytitle">glMapBuffer</span></span></a>,

<a class="citerefentry" href="glUnmapBuffer"><span class="citerefentry"><span class="refentrytitle">glUnmapBuffer</span></span></a>,

<a class="citerefentry" href="glDeleteBuffers"><span class="citerefentry"><span class="refentrytitle">glDeleteBuffers</span></span></a>,

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>,

<a class="citerefentry" href="glIsBuffer"><span class="citerefentry"><span class="refentrytitle">glIsBuffer</span></span></a>

</p></div><div class="refsect1"><div id="Copyright"><h2>Copyright</h2><p>

Copyright © 2005 Addison-Wesley.

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="ulink" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.

</p></div></div></div>