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234 lines
10 KiB
XML
234 lines
10 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="glPointParameter">
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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>glPointParameter</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glPointParameter</refname>
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<refpurpose>specify point parameters</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>void <function>glPointParameterf</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLfloat <parameter>param</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para></para>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glPointParameteri</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint <parameter>param</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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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>pname</parameter></term>
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<listitem>
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<para>
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Specifies a single-valued point parameter.
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<constant>GL_POINT_SIZE_MIN</constant>,
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<constant>GL_POINT_SIZE_MAX</constant>,
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<constant>GL_POINT_FADE_THRESHOLD_SIZE</constant>, and
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<constant>GL_POINT_SPRITE_COORD_ORIGIN</constant>
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are accepted.
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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><parameter>param</parameter></term>
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<listitem>
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<para>
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Specifies the value that <parameter>pname</parameter> will be set to.
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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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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glPointParameterfv</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>const GLfloat * <parameter>params</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para></para>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glPointParameteriv</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>const GLint * <parameter>params</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters2"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>pname</parameter></term>
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<listitem>
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<para>
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Specifies a point parameter.
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<constant>GL_POINT_SIZE_MIN</constant>,
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<constant>GL_POINT_SIZE_MAX</constant>,
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<constant>GL_POINT_DISTANCE_ATTENUATION</constant>,
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<constant>GL_POINT_FADE_THRESHOLD_SIZE</constant>, and
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<constant>GL_POINT_SPRITE_COORD_ORIGIN</constant>
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are accepted.
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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><parameter>params</parameter></term>
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<listitem>
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<para>
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Specifies the value or values to be assigned to <parameter>pname</parameter>.
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<constant>GL_POINT_DISTANCE_ATTENUATION</constant> requires an array of three values.
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All other parameters accept an array containing only a single value.
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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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The following values are accepted for <parameter>pname</parameter>:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_POINT_SIZE_MIN</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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<parameter>params</parameter> is a single floating-point value that specifies the minimum point size. The default value is 0.0.
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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_POINT_SIZE_MAX</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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<parameter>params</parameter> is a single floating-point value that specifies the maximum point size. The default value is 1.0.
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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_POINT_FADE_THRESHOLD_SIZE</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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<parameter>params</parameter> is a single floating-point value that specifies the threshold value
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to which point sizes are clamped if they exceed the specified value. The
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default value is 1.0.
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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_POINT_DISTANCE_ATTENUATION</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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<parameter>params</parameter> is an array of three floating-point values that specify the
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coefficients used for scaling the computed point size. The default values
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are
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<inlineequation><mml:math>
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<!-- eqn: (1, 0, 0):-->
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<mml:mfenced open="(" close=")">
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<mml:mn>1</mml:mn>
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<mml:mn>0</mml:mn>
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<mml:mn>0</mml:mn>
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</mml:mfenced>
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</mml:math></inlineequation>.
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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_POINT_SPRITE_COORD_ORIGIN</constant></term>
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<listitem>
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<para>
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</para>
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<para>
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<parameter>params</parameter> is a single enum specifying the point sprite texture coordinate origin, either <constant>GL_LOWER_LEFT</constant> or <constant>GL_UPPER_LEFT</constant>.
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The default value is <constant>GL_UPPER_LEFT</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="notes"><title>Notes</title>
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<para>
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<function>glPointParameter</function> is available only if the GL version is 1.4 or greater.
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</para>
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<para>
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<constant>GL_POINT_SPRITE_COORD_ORIGIN</constant> is available only if the GL version is 2.0 or greater.
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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_VALUE</constant> is generated If the value specified for
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<constant>GL_POINT_SIZE_MIN</constant>, <constant>GL_POINT_SIZE_MAX</constant>, or
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<constant>GL_POINT_FADE_THRESHOLD_SIZE</constant> is less than zero.
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</para>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated If the value specified for
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<constant>GL_POINT_SPRITE_COORD_ORIGIN</constant> is not <constant>GL_LOWER_LEFT</constant> or <constant>GL_UPPER_LEFT</constant>.
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</para>
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<para>
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If the value for <constant>GL_POINT_SIZE_MIN</constant> is greater than
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<constant>GL_POINT_SIZE_MAX</constant>, the point size after clamping is undefined, but no
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error is generated.
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</para>
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<para>
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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_POINT_SIZE_MIN</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_POINT_SIZE_MAX</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_POINT_FADE_THRESHOLD_SIZE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_POINT_DISTANCE_ATTENUATION</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_POINT_SPRITE_COORD_ORIGIN</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>glPointSize</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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