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276 lines
11 KiB
XML
276 lines
11 KiB
XML
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glLogicOp">
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<info>
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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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<copyright>
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<year>2010-2013</year>
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<holder>Khronos Group</holder>
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</copyright>
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</info>
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<refmeta>
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<refentrytitle>glLogicOp</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glLogicOp</refname>
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<refpurpose>specify a logical pixel operation for rendering</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>glLogicOp</function></funcdef>
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<paramdef>GLenum <parameter>opcode</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 xml:id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>opcode</parameter></term>
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<listitem>
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<para>
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Specifies a symbolic constant that selects a logical operation.
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The following symbols are accepted:
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<constant>GL_CLEAR</constant>,
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<constant>GL_SET</constant>,
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<constant>GL_COPY</constant>,
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<constant>GL_COPY_INVERTED</constant>,
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<constant>GL_NOOP</constant>,
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<constant>GL_INVERT</constant>,
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<constant>GL_AND</constant>,
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<constant>GL_NAND</constant>,
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<constant>GL_OR</constant>,
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<constant>GL_NOR</constant>,
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<constant>GL_XOR</constant>,
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<constant>GL_EQUIV</constant>,
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<constant>GL_AND_REVERSE</constant>,
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<constant>GL_AND_INVERTED</constant>,
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<constant>GL_OR_REVERSE</constant>, and
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<constant>GL_OR_INVERTED</constant>. The initial value is <constant>GL_COPY</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 xml:id="description"><title>Description</title>
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<para>
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<function>glLogicOp</function> specifies a logical operation that,
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when enabled,
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is applied between the incoming RGBA color
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and the RGBA color at the corresponding location in the
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frame buffer.
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To enable or disable the logical operation, call
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<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry>
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using the symbolic constant <constant>GL_COLOR_LOGIC_OP</constant>. The initial value is
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disabled.
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</para>
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<para>
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</para>
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<informaltable>
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<tgroup cols="2">
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<colspec align="left"/>
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<colspec align="center"/>
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<thead>
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<row>
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<entry>
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<emphasis role="bold"> Opcode </emphasis>
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</entry>
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<entry>
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<emphasis role="bold"> Resulting Operation </emphasis>
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</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>
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<constant>GL_CLEAR</constant>
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</entry>
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<entry>
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0
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_SET</constant>
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</entry>
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<entry>
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1
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_COPY</constant>
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</entry>
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<entry>
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s
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_COPY_INVERTED</constant>
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</entry>
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<entry>
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~s
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_NOOP</constant>
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</entry>
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<entry>
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d
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_INVERT</constant>
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</entry>
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<entry>
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~d
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_AND</constant>
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</entry>
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<entry>
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s & d
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_NAND</constant>
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</entry>
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<entry>
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~(s & d)
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_OR</constant>
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</entry>
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<entry>
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s | d
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_NOR</constant>
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</entry>
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<entry>
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~(s | d)
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_XOR</constant>
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</entry>
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<entry>
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s ^ d
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_EQUIV</constant>
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</entry>
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<entry>
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~(s ^ d)
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_AND_REVERSE</constant>
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</entry>
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<entry>
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s & ~d
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_AND_INVERTED</constant>
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</entry>
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<entry>
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~s & d
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_OR_REVERSE</constant>
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</entry>
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<entry>
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s | ~d
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_OR_INVERTED</constant>
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</entry>
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<entry>
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~s | d
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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<parameter>opcode</parameter> is a symbolic constant chosen from the list above.
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In the explanation of the logical operations,
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<emphasis>s</emphasis> represents the incoming color and
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<emphasis>d</emphasis> represents the color in the frame buffer.
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Standard C-language operators are used.
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As these bitwise operators suggest,
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the logical operation is applied independently to each bit pair of the
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source and destination colors.
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</para>
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</refsect1>
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<refsect1 xml:id="notes"><title>Notes</title>
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<para>
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When more than one RGBA color buffer is enabled for drawing,
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logical operations are performed separately for each enabled buffer,
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using for the destination value the contents of that buffer
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(see <citerefentry><refentrytitle>glDrawBuffer</refentrytitle></citerefentry>).
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</para>
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<para>
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Logic operations have no effect on floating point draw buffers. However, if
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<constant>GL_COLOR_LOGIC_OP</constant> is enabled, blending is still disabled
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in this case.
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</para>
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</refsect1>
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<refsect1 xml:id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>opcode</parameter> is not an accepted value.
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</para>
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</refsect1>
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<refsect1 xml:id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_LOGIC_OP_MODE</constant>.
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</para>
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<para>
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<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_COLOR_LOGIC_OP</constant>.
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</para>
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</refsect1>
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<refsect1 xml:id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawBuffer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 1991-2006 Silicon Graphics, Inc.
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Copyright <trademark class="copyright"/> 2010-2013 Khronos Group.
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This document is licensed under the SGI Free Software B License.
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For details, see
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</link>.
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</para>
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</refsect1>
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</refentry>
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