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<refentry id="glCreateProgram">

    <refmeta>

        <refentrytitle>glCreateProgram</refentrytitle>

        <manvolnum>3G</manvolnum>

    </refmeta>

    <refnamediv>

        <refname>glCreateProgram</refname>

        <refpurpose>Creates a program object</refpurpose>

    </refnamediv>

    <refsynopsisdiv><title>C Specification</title>

        <funcsynopsis>

            <funcprototype>

                <funcdef>GLuint <function>glCreateProgram</function></funcdef>

                <paramdef><parameter>void</parameter></paramdef>

            </funcprototype>

        </funcsynopsis>

    </refsynopsisdiv>

    <refsect1 id="description"><title>Description</title>

        <para><function>glCreateProgram</function> creates an empty

        program object and returns a non-zero value by which it can be

        referenced. A program object is an object to which shader

        objects can be attached. This provides a mechanism to specify

        the shader objects that will be linked to create a program. It

        also provides a means for checking the compatibility of the

        shaders that will be used to create a program (for instance,

        checking the compatibility between a vertex shader and a

        fragment shader). When no longer needed as part of a program

        object, shader objects can be detached.</para>

        <para>One or more executables are created in a program object by

        successfully attaching shader objects to it with

        <citerefentry><refentrytitle>glAttachShader</refentrytitle></citerefentry>,

        successfully compiling the shader objects with

        <citerefentry><refentrytitle>glCompileShader</refentrytitle></citerefentry>,

        and successfully linking the program object with

        <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>.

        These executables are made part of current state when

        <citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>

        is called. Program objects can be deleted by calling

        <citerefentry><refentrytitle>glDeleteProgram</refentrytitle></citerefentry>.

        The memory associated with the program object will be deleted

        when it is no longer part of current rendering state for any

        context.</para>

    </refsect1>

    <refsect1 id="notes"><title>Notes</title>

        <para><function>glCreateProgram</function> is available only if

        the GL version is 2.0 or greater.</para>

        <para>Like display lists and texture objects, the name space for

        program objects may be shared across a set of contexts, as long

        as the server sides of the contexts share the same address

        space. If the name space is shared across contexts, any attached

        objects and the data associated with those attached objects are

        shared as well.</para>

        <para>Applications are responsible for providing the

        synchronization across API calls when objects are accessed from

        different execution threads.</para>

    </refsect1>

    <refsect1 id="errors"><title>Errors</title>

        <para>This function returns 0 if an error occurs creating the program object.</para>

        <para><constant>GL_INVALID_OPERATION</constant> is generated if

        <function>glCreateProgram</function> is executed between the

        execution of

        <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>

        and the corresponding execution of

        <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.</para>

    </refsect1>

    <refsect1 id="associatedgets"><title>Associated Gets</title>

        <para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>

        with the argument <constant>GL_CURRENT_PROGRAM</constant></para>

        <para><citerefentry><refentrytitle>glGetActiveAttrib</refentrytitle></citerefentry>

        with a valid program object and the index of an active attribute

        variable</para>

        <para><citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>

        with a valid program object and the index of an active uniform

        variable</para>

        <para><citerefentry><refentrytitle>glGetAttachedShaders</refentrytitle></citerefentry>

        with a valid program object</para>

        <para><citerefentry><refentrytitle>glGetAttribLocation</refentrytitle></citerefentry>

        with a valid program object and the name of an attribute

        variable</para>

        <para><citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>

        with a valid program object and the parameter to be queried</para>

        <para><citerefentry><refentrytitle>glGetProgramInfoLog</refentrytitle></citerefentry>

        with a valid program object</para>

        <para><citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry>

        with a valid program object and the location of a uniform

        variable</para>

        <para><citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>

        with a valid program object and the name of a uniform

        variable</para>

        <para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry></para>

    </refsect1>

    <refsect1 id="seealso"><title>See Also</title>

        <para><citerefentry><refentrytitle>glAttachShader</refentrytitle></citerefentry>,

        <citerefentry><refentrytitle>glBindAttribLocation</refentrytitle></citerefentry>,

        <citerefentry><refentrytitle>glCreateShader</refentrytitle></citerefentry>,

        <citerefentry><refentrytitle>glDeleteProgram</refentrytitle></citerefentry>,

        <citerefentry><refentrytitle>glDetachShader</refentrytitle></citerefentry>,

        <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,

        <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>,

        <citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>,

        <citerefentry><refentrytitle>glValidateProgram</refentrytitle></citerefentry></para>

    </refsect1>

    <refsect1 id="Copyright"><title>Copyright</title>

        <para>

            Copyright <trademark class="copyright"></trademark> 2003-2005 3Dlabs Inc. Ltd.

            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>