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185 lines
8.6 KiB
XML
185 lines
8.6 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glRenderMode">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glRenderMode</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glRenderMode</refname>
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<refpurpose>set rasterization mode</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>GLint <function>glRenderMode</function></funcdef>
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<paramdef>GLenum <parameter>mode</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>mode</parameter></term>
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<listitem>
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<para>
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Specifies the rasterization mode.
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Three values are accepted:
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<constant>GL_RENDER</constant>,
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<constant>GL_SELECT</constant>, and
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<constant>GL_FEEDBACK</constant>.
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The initial value is <constant>GL_RENDER</constant>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glRenderMode</function> sets the rasterization mode.
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It takes one argument,
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<parameter>mode</parameter>,
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which can assume one of three predefined values:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_RENDER</constant></term>
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<listitem>
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<para>
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Render mode. Primitives are rasterized,
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producing pixel fragments,
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which are written into the frame buffer.
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This is the normal mode
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and also the default mode.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_SELECT</constant></term>
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<listitem>
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<para>
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Selection mode.
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No pixel fragments are produced,
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and no change to the frame buffer contents is made.
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Instead,
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a record of the names of primitives that would have been drawn
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if the render mode had been <constant>GL_RENDER</constant> is returned in a select buffer,
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which must be created (see <citerefentry><refentrytitle>glSelectBuffer</refentrytitle></citerefentry>) before selection mode
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is entered.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_FEEDBACK</constant></term>
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<listitem>
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<para>
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Feedback mode.
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No pixel fragments are produced,
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and no change to the frame buffer contents is made.
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Instead,
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the coordinates and attributes of vertices that would have been drawn
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if the render mode had been <constant>GL_RENDER</constant> is returned in a feedback buffer,
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which must be created (see <citerefentry><refentrytitle>glFeedbackBuffer</refentrytitle></citerefentry>) before feedback mode
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is entered.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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The return value of <function>glRenderMode</function> is determined by the render mode at the time
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<function>glRenderMode</function> is called,
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rather than by <parameter>mode</parameter>.
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The values returned for the three render modes are as follows:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_RENDER</constant></term>
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<listitem>
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<para>
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0.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_SELECT</constant></term>
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<listitem>
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<para>
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The number of hit records transferred to the select buffer.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_FEEDBACK</constant></term>
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<listitem>
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<para>
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The number of values (not vertices) transferred to the feedback buffer.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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See the <citerefentry><refentrytitle>glSelectBuffer</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glFeedbackBuffer</refentrytitle></citerefentry> reference pages for
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more details concerning selection and feedback operation.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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If an error is generated,
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<function>glRenderMode</function> returns 0 regardless of the current render mode.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>mode</parameter> is not one of the three
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accepted values.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <citerefentry><refentrytitle>glSelectBuffer</refentrytitle></citerefentry> is called
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while the render mode is <constant>GL_SELECT</constant>,
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or if <function>glRenderMode</function> is called with argument <constant>GL_SELECT</constant> before
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<citerefentry><refentrytitle>glSelectBuffer</refentrytitle></citerefentry> is called at least once.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <citerefentry><refentrytitle>glFeedbackBuffer</refentrytitle></citerefentry> is called
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while the render mode is <constant>GL_FEEDBACK</constant>,
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or if <function>glRenderMode</function> is called with argument <constant>GL_FEEDBACK</constant> before
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<citerefentry><refentrytitle>glFeedbackBuffer</refentrytitle></citerefentry> is called at least once.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glRenderMode</function>
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is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_RENDER_MODE</constant>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glFeedbackBuffer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glInitNames</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLoadName</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPassThrough</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPushName</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glSelectBuffer</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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