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+<?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>glDepthRange</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glDepthRange"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glDepthRange — specify mapping of depth values from normalized device coordinates to window coordinates</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">glDepthRange</b>(</code></td><td>GLclampd </td><td><var class="pdparam">nearVal</var>, </td></tr><tr><td> </td><td>GLclampd </td><td><var class="pdparam">farVal</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>nearVal</code></em></span></dt><dd><p>
+ Specifies the mapping of the near clipping plane to window coordinates.
+ The initial value is 0.
+ </p></dd><dt><span class="term"><em class="parameter"><code>farVal</code></em></span></dt><dd><p>
+ Specifies the mapping of the far clipping plane to window coordinates.
+ The initial value is 1.
+ </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
+ After clipping and division by <span class="emphasis"><em>w</em></span>,
+ depth coordinates range from
+ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
+
+ <mml:mn>-1</mml:mn>
+ </mml:math>
+ to 1,
+ corresponding to the near and far clipping planes.
+ <code class="function">glDepthRange</code> specifies a linear mapping of the normalized depth coordinates
+ in this range to window depth coordinates.
+ Regardless of the actual depth buffer implementation,
+ window coordinate depth values are treated as though they range
+ from 0 through 1 (like color components).
+ Thus,
+ the values accepted by <code class="function">glDepthRange</code> are both clamped to this range
+ before they are accepted.
+ </p><p>
+ The setting of (0,1) maps the near plane to 0 and
+ the far plane to 1.
+ With this mapping,
+ the depth buffer range is fully utilized.
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
+ It is not necessary that <em class="parameter"><code>nearVal</code></em> be less than <em class="parameter"><code>farVal</code></em>.
+ Reverse mappings such as
+ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
+
+ <mml:mrow>
+ <mml:mi mathvariant="italic">nearVal</mml:mi>
+ <mml:mo>=</mml:mo>
+ <mml:mn>1</mml:mn>
+ </mml:mrow>
+ </mml:math>,
+ and
+ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
+
+ <mml:mrow>
+ <mml:mi mathvariant="italic">farVal</mml:mi>
+ <mml:mo>=</mml:mo>
+ <mml:mn>0</mml:mn>
+ </mml:mrow>
+ </mml:math>
+ are acceptable.
+ </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_DEPTH_RANGE</code>
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
+ <a href="glDepthFunc.xml"><span class="citerefentry"><span class="refentrytitle">glDepthFunc</span></span></a>,
+ <a href="glPolygonOffset.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonOffset</span></span></a>,
+ <a href="glViewport.xml"><span class="citerefentry"><span class="refentrytitle">glViewport</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