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<refentry id="glProgramBinary">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>2010</year>
                <holder>Khronos Group</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glProgramBinary</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glProgramBinary</refname>
        <refpurpose>load a program object with a program binary</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glProgramBinary</function></funcdef>
                <paramdef>GLuint <parameter>program</parameter></paramdef>
                <paramdef>GLenum <parameter>binaryFormat</parameter></paramdef>
                <paramdef>const void *<parameter>binary</parameter></paramdef>
                <paramdef>GLsizei <parameter>length</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>program</parameter></term>
            <listitem>
            <para>
                Specifies the name of a program object into which to load a program binary.
            </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>binaryFormat</parameter></term>
            <listitem>
            <para>
                Specifies the format of the binary data in binary.
            </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>binary</parameter></term>
            <listitem>
            <para>
                Specifies the address an array containing the binary to be loaded into <parameter>program</parameter>.
            </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>length</parameter></term>
            <listitem>
            <para>
                Specifies the number of bytes contained in <parameter>binary</parameter>.
            </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glProgramBinary</function> loads a program object with a program binary previously
            returned from <citerefentry><refentrytitle>glGetProgramBinary</refentrytitle></citerefentry>.
            <parameter>binaryFormat</parameter> and <parameter>binary</parameter> must be those returned
            by a previous call to <citerefentry><refentrytitle>glGetProgramBinary</refentrytitle></citerefentry>,
            and <parameter>length</parameter> must be the length returned by
            <citerefentry><refentrytitle>glGetProgramBinary</refentrytitle></citerefentry>, or by
            <citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry> when called with
            <parameter>pname</parameter> set to <constant>GL_PROGRAM_BINARY_LENGTH</constant>.
            If these conditions are not met, loading the program binary will fail and <parameter>program</parameter>'s
            <constant>GL_LINK_STATUS</constant> will be set to <constant>GL_FALSE</constant>.
        </para>
        <para>
            A program object's program binary is replaced by calls to
            <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> or
            <function>glProgramBinary</function>. When linking success or failure is concerned, <function>glProgramBinary</function>
            can be considered to perform an implicit linking operation.
            <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> and <function>glProgramBinary</function>
            both set the program object's <constant>GL_LINK_STATUS</constant> to <constant>GL_TRUE</constant>
            or <constant>GL_FALSE</constant>.
        </para>
        <para>
            A successful call to <function>glProgramBinary</function> will reset all uniform variables to their
            initial values. The initial value is either the value of the variable's initializer as specified in the
            original shader source, or zero if no initializer was present. Additionally, all vertex shader input
            and fragment shader output assignments that were in effect when the program was linked before saving are
            restored with <function>glProgramBinary</function> is called.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <parameter>program</parameter> is not the
            name of an existing program object.
        </para>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>binaryFormat</parameter> is not a
            value recognized by the implementation.
        </para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para>
            A program binary may fail to load if the implementation determines that there has been a
            change in hardware or software configuration from when the program binary was produced such
            as having been compiled with an incompatible or outdated version of the compiler.
        </para>
    </refsect1>
    <refsect1 id="associatedgets"><title>Associated Gets</title>
        <para>
            <citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry> with argument <constant>GL_PROGRAM_BINARY_LENGTH</constant>
        </para>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_NUM_PROGRAM_BINARY_FORMATS</constant>
        </para>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PROGRAM_BINARY_FORMATS</constant>
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGetProgramBinary</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"></trademark> 2010 Khronos Group. 
            This material may be distributed subject to the terms and conditions set forth in 
            the Open Publication License, v 1.0, 8 June 1999.
            <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
        </para>
    </refsect1>
</refentry>
