mirror of
https://github.com/Ryujinx/Opentk.git
synced 2024-12-27 08:35:32 +00:00
114 lines
5.1 KiB
XML
114 lines
5.1 KiB
XML
<?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="glSampleCoverage">
|
|
<refmeta>
|
|
<refmetainfo>
|
|
<copyright>
|
|
<year>1991-2006</year>
|
|
<holder>Silicon Graphics, Inc.</holder>
|
|
</copyright>
|
|
</refmetainfo>
|
|
<refentrytitle>glSampleCoverage</refentrytitle>
|
|
<manvolnum>3G</manvolnum>
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname>glSampleCoverage</refname>
|
|
<refpurpose>specify multisample coverage parameters</refpurpose>
|
|
</refnamediv>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glSampleCoverage</function></funcdef>
|
|
<paramdef>GLclampf <parameter>value</parameter></paramdef>
|
|
<paramdef>GLboolean <parameter>invert</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<!-- eqn: ignoring delim $$ -->
|
|
<refsect1 id="parameters"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>value</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specify a single floating-point sample coverage value. The value is
|
|
clamped to the range
|
|
<inlineequation><mml:math>
|
|
<!-- eqn: [0 ,1]:-->
|
|
<mml:mfenced open="[" close="]">
|
|
<mml:mn>0</mml:mn>
|
|
<mml:mn>1</mml:mn>
|
|
</mml:mfenced>
|
|
</mml:math></inlineequation>.
|
|
The initial value is 1.0.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>invert</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Specify a single boolean value representing if the coverage masks should be
|
|
inverted. <constant>GL_TRUE</constant> and <constant>GL_FALSE</constant> are accepted. The initial value
|
|
is <constant>GL_FALSE</constant>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>
|
|
Multisampling samples a pixel multiple times at various
|
|
implementation-dependent subpixel locations to generate antialiasing
|
|
effects. Multisampling transparently antialiases points, lines, and polygons
|
|
if it is enabled.
|
|
</para>
|
|
<para>
|
|
<parameter>value</parameter> is used in constructing a temporary mask used in determining which
|
|
samples will be used in resolving the final fragment color. This mask is
|
|
bitwise-anded with the coverage mask generated from the multisampling
|
|
computation. If the <parameter>invert</parameter> flag is set, the temporary mask is inverted
|
|
(all bits flipped) and then the bitwise-and is computed.
|
|
</para>
|
|
<para>
|
|
If an implementation does not have any multisample buffers available, or
|
|
multisampling is disabled, rasterization occurs with only a single sample
|
|
computing a pixel's final RGB color.
|
|
</para>
|
|
<para>
|
|
Provided an implementation supports multisample buffers, and multisampling
|
|
is enabled, then a pixel's final color is generated by combining several
|
|
samples per pixel. Each sample contains color, depth, and stencil
|
|
information, allowing those operations to be performed on each sample.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_SAMPLE_COVERAGE_VALUE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_SAMPLE_COVERAGE_INVERT</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_SAMPLE_ALPHA_TO_COVERAGE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_SAMPLE_COVERAGE</constant>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 1991-2006
|
|
Silicon Graphics, Inc. This document is licensed under the SGI
|
|
Free Software B License. For details, see
|
|
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|