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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>
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