--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
+ "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
+<refentry id="glDepthRangeArray">
+ <refmeta>
+ <refmetainfo>
+ <copyright>
+ <year>2010</year>
+ <holder>Khronos Group</holder>
+ </copyright>
+ </refmetainfo>
+ <refentrytitle>glDepthRangeArray</refentrytitle>
+ <manvolnum>3G</manvolnum>
+ </refmeta>
+ <refnamediv>
+ <refname>glDepthRangeArray</refname>
+ <refpurpose>specify mapping of depth values from normalized device coordinates to window coordinates for a specified set of viewports</refpurpose>
+ </refnamediv>
+ <refsynopsisdiv><title>C Specification</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>void <function>glDepthRangeArrayv</function></funcdef>
+ <paramdef>GLuint <parameter>first</parameter></paramdef>
+ <paramdef>GLsizei <parameter>count</parameter></paramdef>
+ <paramdef>const GLdouble *<parameter>v</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+ <!-- eqn: ignoring delim $$ -->
+ <refsect1 id="parameters"><title>Parameters</title>
+ <variablelist>
+ <varlistentry>
+ <term><parameter>first</parameter></term>
+ <listitem>
+ <para>
+ Specifies the index of the first viewport whose depth range to update.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>count</parameter></term>
+ <listitem>
+ <para>
+ Specifies the number of viewports whose depth range to update.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><parameter>v</parameter></term>
+ <listitem>
+ <para>
+ Specifies the address of an array containing the near and far values for the
+ depth range of each modified viewport.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+ <refsect1 id="description"><title>Description</title>
+ <para>
+ After clipping and division by <emphasis>w</emphasis>,
+ depth coordinates range from
+ <inlineequation><mml:math>
+ <!-- eqn: -1: -->
+ <mml:mn>-1</mml:mn>
+ </mml:math></inlineequation>
+ to 1,
+ corresponding to the near and far clipping planes.
+ Each viewport has an independent depth range specified as 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).
+ <function>glDepthRangeArray</function> specifies a linear mapping of the normalized depth coordinates
+ in this range to window depth coordinates for each viewport in the range [<parameter>first</parameter>,
+ <parameter>first</parameter> + <parameter>count</parameter>).
+ Thus,
+ the values accepted by <function>glDepthRangeArray</function> are both clamped to this range
+ before they are accepted.
+ </para>
+ <para>
+ The <parameter>first</parameter> parameter specifies the index of the first viewport whose depth
+ range to modify and must be less than the value of <constant>GL_MAX_VIEWPORTS</constant>.
+ <parameter>count</parameter> specifies the number of viewports whose depth range to modify.
+ <parameter>first</parameter> + <parameter>count</parameter> must be less than or equal to
+ the value of <constant>GL_MAX_VIEWPORTS</constant>. <parameter>v</parameter> specifies the address of an
+ array of pairs of double precision floating point values representing the near and far values of the
+ depth range for each viewport, in that order.
+ </para>
+ <para>
+ 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.
+ </para>
+ </refsect1>
+ <refsect1 id="notes"><title>Notes</title>
+ <para>
+ It is not necessary that the near plane distance be less than the far plane distance.
+ Reverse mappings such as
+ <inlineequation><mml:math>
+ <!-- eqn: nearVal = 1: -->
+ <mml:mrow>
+ <mml:mi mathvariant="italic">near</mml:mi>
+ <mml:mo>=</mml:mo>
+ <mml:mn>1</mml:mn>
+ </mml:mrow>
+ </mml:math></inlineequation>,
+ and
+ <inlineequation><mml:math>
+ <!-- eqn: farVal = 0: -->
+ <mml:mrow>
+ <mml:mi mathvariant="italic">far</mml:mi>
+ <mml:mo>=</mml:mo>
+ <mml:mn>0</mml:mn>
+ </mml:mrow>
+ </mml:math></inlineequation>
+ are acceptable.
+ </para>
+ <para>
+ The type of the <parameter>v</parameter> parameter was
+ changed from GLclampd to GLdouble. This change is
+ transparent to user code and is described in detail on the
+ <citerefentry><refentrytitle>removedTypes</refentrytitle></citerefentry>
+ page.
+ </para>
+ </refsect1>
+ <refsect1 id="errors"><title>Errors</title>
+ <para>
+ <constant>GL_INVALID_VALUE</constant> is generated if <parameter>first</parameter> is greater than or equal to
+ the value of <constant>GL_MAX_VIEWPORTS</constant>.
+ </para>
+ <para>
+ <constant>GL_INVALID_VALUE</constant> is generated if <parameter>first</parameter> + <parameter>count</parameter>
+ is greater than or equal to the value of <constant>GL_MAX_VIEWPORTS</constant>.
+ </para>
+ </refsect1>
+ <refsect1 id="associatedgets"><title>Associated Gets</title>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_DEPTH_RANGE</constant>
+ </para>
+ </refsect1>
+ <refsect1 id="seealso"><title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glDepthRangeIndexed</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glViewportArray</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glViewport</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>removedTypes</refentrytitle></citerefentry>
+ </para>
+ </refsect1>
+ <refsect1 id="Copyright"><title>Copyright</title>
+ <para>
+ Copyright <trademark class="copyright"></trademark> 2010 Khronos Group.
+ This material may be distributed subject to the terms and conditions set forth in
+ the Open Publication License, v 1.0, 8 June 1999.
+ <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
+ </para>
+ </refsect1>
+</refentry>
HCoop / clinton / guile-figl.git / blobdiff