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195 lines
8.9 KiB
XML
195 lines
8.9 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="glPolygonStipple">
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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>glPolygonStipple</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glPolygonStipple</refname>
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<refpurpose>set the polygon stippling pattern</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>glPolygonStipple</function></funcdef>
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<paramdef>const GLubyte * <parameter>pattern</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>pattern</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to a
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<inlineequation><mml:math>
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<!-- eqn: 32 times 32:-->
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<mml:mrow>
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<mml:mn>32</mml:mn>
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<mml:mo>×</mml:mo>
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<mml:mn>32</mml:mn>
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</mml:mrow>
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</mml:math></inlineequation>
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stipple pattern that will be unpacked
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from memory in the same way that <citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry> unpacks pixels.
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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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Polygon stippling,
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like line stippling
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(see <citerefentry><refentrytitle>glLineStipple</refentrytitle></citerefentry>),
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masks out certain fragments produced by rasterization,
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creating a pattern.
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Stippling is independent of polygon antialiasing.
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</para>
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<para>
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<parameter>pattern</parameter> is a pointer to a
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<inlineequation><mml:math>
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<!-- eqn: 32 times 32:-->
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<mml:mrow>
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<mml:mn>32</mml:mn>
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<mml:mo>×</mml:mo>
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<mml:mn>32</mml:mn>
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</mml:mrow>
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</mml:math></inlineequation>
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stipple pattern that is stored
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in memory just like the pixel data supplied to a <citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>
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call with
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<emphasis></emphasis>
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height
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and
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<emphasis>width</emphasis>
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both equal to 32, a pixel format
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of <constant>GL_COLOR_INDEX</constant>, and data type
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of <constant>GL_BITMAP</constant>.
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That is,
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the stipple pattern is represented as a
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<inlineequation><mml:math>
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<!-- eqn: 32 times 32:-->
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<mml:mrow>
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<mml:mn>32</mml:mn>
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<mml:mo>×</mml:mo>
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<mml:mn>32</mml:mn>
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</mml:mrow>
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</mml:math></inlineequation>
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array
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of 1-bit color indices packed in unsigned bytes.
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<citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry> parameters like <constant>GL_UNPACK_SWAP_BYTES</constant>
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and <constant>GL_UNPACK_LSB_FIRST</constant> affect the assembling of the bits into a
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stipple pattern.
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Pixel transfer operations
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(shift, offset, pixel map)
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are not applied to the stipple image,
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however.
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</para>
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<para>
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If a non-zero named buffer object is bound to the <constant>GL_PIXEL_UNPACK_BUFFER</constant> target
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(see <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>) while a stipple pattern is
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specified, <parameter>pattern</parameter> is treated as a byte offset into the buffer object's data store.
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</para>
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<para>
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To enable and disable polygon stippling, call
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<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry>
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with argument <constant>GL_POLYGON_STIPPLE</constant>. Polygon stippling is initially
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disabled. If it's enabled,
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a rasterized polygon fragment with window coordinates
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<inlineequation><mml:math>
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<!-- eqn: x sub w:-->
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<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">w</mml:mi>
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</mml:msub>
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</mml:math></inlineequation>
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and
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<inlineequation><mml:math>
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<!-- eqn: y sub w:-->
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<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
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<mml:mi mathvariant="italic">w</mml:mi>
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</mml:msub>
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</mml:math></inlineequation>
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is sent to the next stage of the GL if and only if the
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(<inlineequation><mml:math>
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<!-- eqn: x sub w mod 32:-->
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<mml:mrow>
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<mml:msub><mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">w</mml:mi>
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</mml:msub>
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<mml:mo>%</mml:mo>
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<mml:mn>32</mml:mn>
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</mml:mrow>
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</mml:math></inlineequation>)th
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bit in the
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(<inlineequation><mml:math>
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<!-- eqn: y sub w mod 32:-->
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<mml:mrow>
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<mml:msub><mml:mi mathvariant="italic">y</mml:mi>
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<mml:mi mathvariant="italic">w</mml:mi>
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</mml:msub>
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<mml:mo>%</mml:mo>
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<mml:mn>32</mml:mn>
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</mml:mrow>
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</mml:math></inlineequation>)th
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row
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of the stipple pattern is 1 (one).
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When polygon stippling is disabled, it is as if the stipple pattern
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consists of all 1's.
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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_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and the buffer object's data store is currently mapped.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and the data would be unpacked from the buffer
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object such that the memory reads required would exceed the data store size.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glPolygonStipple</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>glGetPolygonStipple</refentrytitle></citerefentry>
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</para>
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<para>
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<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_POLYGON_STIPPLE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_UNPACK_BUFFER_BINDING</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>glDrawPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLineStipple</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPixelTransfer</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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