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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>glDrawBuffer - OpenGL 4 Reference Pages</title>
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<header/>
<div class="refentry" id="glDrawBuffer">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glDrawBuffer, glNamedFramebufferDrawBuffer — specify which color buffers are to be drawn into</p>
</div>
<div class="refsynopsisdiv">
<h2>C Specification</h2>
<div class="funcsynopsis">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glDrawBuffer</strong>(</code>
</td>
<td>GLenum <var class="pdparam">buf</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glNamedFramebufferDrawBuffer</strong>(</code>
</td>
<td>GLuint <var class="pdparam">framebuffer</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLenum <var class="pdparam">buf</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
</div>
<div class="refsect1" id="parameters">
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<em class="parameter">
<code>framebuffer</code>
</em>
</span>
</dt>
<dd>
<p>Specifies the name of the framebuffer object for
<code class="function">glNamedFramebufferDrawBuffer</code> function. Must be
zero or the name of a framebuffer object.</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>buf</code>
</em>
</span>
</dt>
<dd>
<p>For default framebuffer, the argument specifies up to four
color buffers to be drawn into. Symbolic constants
<code class="constant">GL_NONE</code>, <code class="constant">GL_FRONT_LEFT</code>,
<code class="constant">GL_FRONT_RIGHT</code>,
<code class="constant">GL_BACK_LEFT</code>,
<code class="constant">GL_BACK_RIGHT</code>, <code class="constant">GL_FRONT</code>,
<code class="constant">GL_BACK</code>, <code class="constant">GL_LEFT</code>,
<code class="constant">GL_RIGHT</code>, and
<code class="constant">GL_FRONT_AND_BACK</code> are accepted. The initial
value is <code class="constant">GL_FRONT</code> for single-buffered contexts,
and <code class="constant">GL_BACK</code> for double-buffered contexts. For
framebuffer objects, <code class="constant">GL_COLOR_ATTACHMENT$m$</code> and
<code class="constant">GL_NONE</code> enums are accepted, where
<code class="constant">$m$</code> is a value between 0 and
<code class="constant">GL_MAX_COLOR_ATTACHMENTS</code>.</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>When colors are written to the frame buffer, they are written into
the color buffers specified by <code class="function">glDrawBuffer</code>. One of
the following values can be used for default framebuffer:</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="constant">GL_NONE</code>
</span>
</dt>
<dd>
<p>No color buffers are written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_FRONT_LEFT</code>
</span>
</dt>
<dd>
<p>Only the front left color buffer is written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_FRONT_RIGHT</code>
</span>
</dt>
<dd>
<p>Only the front right color buffer is written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_BACK_LEFT</code>
</span>
</dt>
<dd>
<p>Only the back left color buffer is written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_BACK_RIGHT</code>
</span>
</dt>
<dd>
<p>Only the back right color buffer is written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_FRONT</code>
</span>
</dt>
<dd>
<p>Only the front left and front right color buffers are written.
If there is no front right color buffer, only the front left color
buffer is written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_BACK</code>
</span>
</dt>
<dd>
<p>Only the back left and back right color buffers are written.
If there is no back right color buffer, only the back left color
buffer is written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_LEFT</code>
</span>
</dt>
<dd>
<p>Only the front left and back left color buffers are written.
If there is no back left color buffer, only the front left color
buffer is written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_RIGHT</code>
</span>
</dt>
<dd>
<p>Only the front right and back right color buffers are written.
If there is no back right color buffer, only the front right color
buffer is written.</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_FRONT_AND_BACK</code>
</span>
</dt>
<dd>
<p>All the front and back color buffers (front left, front right,
back left, back right) are written. If there are no back color
buffers, only the front left and front right color buffers are
written. If there are no right color buffers, only the front left
and back left color buffers are written. If there are no right or
back color buffers, only the front left color buffer is
written.</p>
</dd>
</dl>
</div>
<p>If more than one color buffer is selected for drawing, then blending
or logical operations are computed and applied independently for each
color buffer and can produce different results in each buffer.</p>
<p>Monoscopic contexts include only <span class="emphasis"><em>left</em></span> buffers,
and stereoscopic contexts include both <span class="emphasis"><em>left</em></span> and
<span class="emphasis"><em>right</em></span> buffers. Likewise, single-buffered contexts
include only <span class="emphasis"><em>front</em></span> buffers, and double-buffered
contexts include both <span class="emphasis"><em>front</em></span> and
<span class="emphasis"><em>back</em></span> buffers. The context is selected at GL
initialization.</p>
<p>For framebuffer objects, <code class="constant">GL_COLOR_ATTACHMENT$m$</code>
and <code class="constant">GL_NONE</code> enums are accepted, where
<code class="constant">$m$</code> is a value between 0 and
<code class="constant">GL_MAX_COLOR_ATTACHMENTS</code>. glDrawBuffer will set the
draw buffer for fragment colors other than zero to
<code class="constant">GL_NONE</code>.</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p><code class="constant">GL_INVALID_OPERATION</code> error is generated by
<code class="function">glNamedFramebufferDrawBuffer</code> if
<em class="parameter"><code>framebuffer</code></em> is not zero or the name of an existing
framebuffer object.</p>
<p><code class="constant">GL_INVALID_ENUM</code> is generated if
<em class="parameter"><code>buf</code></em> is not an accepted value.</p>
<p><code class="constant">GL_INVALID_OPERATION</code> is generated if the
default framebuffer is affected and none of the buffers indicated by
<em class="parameter"><code>buf</code></em> exists.</p>
<p><code class="constant">GL_INVALID_OPERATION</code> is generated if a
framebuffer object is affected and <em class="parameter"><code>buf</code></em> is not equal
to <code class="constant">GL_NONE</code> or
<code class="constant">GL_COLOR_ATTACHMENT$m$</code>, where
<code class="constant">$m$</code> is a value between 0 and
<code class="constant">GL_MAX_COLOR_ATTACHMENTS</code>.</p>
</div>
<div class="refsect1" id="associatedgets">
<h2>Associated Gets</h2>
<p>
<a class="citerefentry" href="glGet.xhtml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_DRAW_BUFFER</code>
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
<colgroup>
<col style="text-align: left; "/>
<col style="text-align: center; " class="firstvers"/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; " class="lastvers"/>
</colgroup>
<thead>
<tr>
<th style="text-align: left; border-right: 2px solid ; ">
</th>
<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
<span class="bold"><strong>OpenGL Version</strong></span>
</th>
</tr>
<tr>
<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>Function / Feature Name</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.4</strong></span>
</th>
<th style="text-align: center; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.5</strong></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="function">glDrawBuffer</code>
</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-bottom: 2px solid ; ">✔</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">
<code class="function">glNamedFramebufferDrawBuffer</code>
</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; ">✔</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="glBlendFunc.xhtml"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a>,
<a class="citerefentry" href="glColorMask.xhtml"><span class="citerefentry"><span class="refentrytitle">glColorMask</span></span></a>,
<a class="citerefentry" href="glDrawBuffers.xhtml"><span class="citerefentry"><span class="refentrytitle">glDrawBuffers</span></span></a>,
<a class="citerefentry" href="glLogicOp.xhtml"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>,
<a class="citerefentry" href="glReadBuffer.xhtml"><span class="citerefentry"><span class="refentrytitle">glReadBuffer</span></span></a>
</p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright <span class="trademark"/>© 1991-2006 Silicon Graphics, Inc.
Copyright <span class="trademark"/>© 2010-2014 Khronos Group.
This document is licensed under the SGI Free Software B License.
For details, see
<a class="link" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
</p>
</div>
</div>
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