+++ /dev/null
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
-<!-- saved from url=(0013)about:internet -->
-<?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>glDrawBuffer - 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="glDrawBuffer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glDrawBuffer — specify which color buffers are to be drawn into</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><p><code class="funcdef">void <b class="fsfunc">glDrawBuffer</b>(</code>GLenum <var class="pdparam">mode</var><code>)</code>;</p></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>mode</code></em></span></dt><dd><p>
- 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.
- </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><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>.
- The specifications are as follows:
- </p><div class="variablelist"><dl><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></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
- <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>mode</code></em> is not an accepted value.
- </p><p>
- <code class="constant">GL_INVALID_OPERATION</code> is generated if none of the buffers indicated
- by <em class="parameter"><code>mode</code></em> exists.
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
- <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_DRAW_BUFFER</code>
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
- <a href="glBlendFunc.xml"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a>,
- <a href="glColorMask.xml"><span class="citerefentry"><span class="refentrytitle">glColorMask</span></span></a>,
- <a href="glDrawBuffers.xml"><span class="citerefentry"><span class="refentrytitle">glDrawBuffers</span></span></a>,
- <a href="glLogicOp.xml"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>,
- <a href="glReadBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glReadBuffer</span></span></a>
- </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
- Copyright <span class="trademark"></span>© 1991-2006
- Silicon Graphics, Inc. This document is licensed under the SGI
- Free Software B License. For details, see
- <a href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
- </p></div></div></body></html>
HCoop / clinton / guile-figl.git / blobdiff