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<?xml version="1.0"?>

<ratified href="ANGLE_instanced_arrays/">

  <name>ANGLE_instanced_arrays</name>

  <contact>

    <a href="https://www.khronos.org/webgl/public-mailing-list/">WebGL working group</a> (public_webgl 'at' khronos.org)

  </contact>

  <contributors>

    <contributor>Contributors to ANGLE_instanced_arrays</contributor>

    <contributor>Members of the WebGL working group</contributor>

  </contributors>

  <number>19</number>

  <depends>

    <api version="1.0"/>

    <core version="2.0" />

  </depends>

  <overview>

    <mirrors href="http://www.khronos.org/registry/gles/extensions/ANGLE/ANGLE_instanced_arrays.txt" name="ANGLE_instanced_arrays">

      <addendum>

        The implementation must validate the indices referenced by <code>drawArraysInstancedANGLE</code> and <code>drawElementsInstancedANGLE</code>

        similarly to how indices referenced by <code>drawArrays</code> and <code>drawElements</code> are validated according to section

        <a href="http://www.khronos.org/registry/webgl/specs/1.0/#ATTRIBS_AND_RANGE_CHECKING">Enabled Vertex Attributes and Range Checking</a> of the

        WebGL specification.

      </addendum>

    </mirrors>

<p>

      Although the extension contains ANGLE in the name it may be exposed by any implementation, whether or not the implementation uses the ANGLE library.

    </p>

  </overview>

  <idl xml:space="preserve">

[NoInterfaceObject]

interface ANGLE_instanced_arrays {

    const GLenum VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE = 0x88FE;

    void drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount);

    void drawElementsInstancedANGLE(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei primcount);

    void vertexAttribDivisorANGLE(GLuint index, GLuint divisor);

};

  </idl>

  <issues>

    <p>How does ANGLE_instanced_arrays interact with OES_vertex_array_object?</p>

    <ul>

      <li>

        <p>RESOLVED: When the ANGLE_instanced_arrays and OES_vertex_array_object

        extensions are both enabled, attribute divisors are tracked by the

        vertex array objects like any other vertex array state.

        </p>

      </li>

    </ul>

  </issues>

  <history>

    <revision date="2012/03/06">

      <change>Initial revision.</change>

    </revision>

    <revision date="2013/01/26">

      <change>Moved from proposal to draft.</change>

    </revision>

    <revision date="2013/03/11">

      <change>Renumbered to 19 to fix misnumbering problem.</change>

    </revision>

    <revision date="2013/08/06">

      <change>Moved to community approved.</change>

    </revision>

    <revision date="2013/08/22">

      <change>Clarified non-ANGLE support.</change>

    </revision>

    <revision date="2014/03/13">

      <change>Addendum about index validation.</change>

    </revision>

    <revision date="2014/07/15">

      <change>Added NoInterfaceObject extended attribute.</change>

    </revision>

    <revision date="2014/08/08">

      <change>Ratified by Khronos Board of Promoters.</change>

    </revision>

    <revision date="2015/09/23">

      <change>Clarified interaction with OES_vertex_array_object.</change>

    </revision>

  </history>

</ratified>