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    WebGL2RenderingContext.drawArraysInstanced()

    This is an experimental technology
    Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

    The WebGL2RenderingContext.drawArraysInstanced() method of the WebGL 2 API renders primitives from array data like the gl.drawArrays() method. In addition, it can execute multiple instances of the range of elements.

    Note: When using WebGL 1, the ANGLE_instanced_arrays extension can provide this method, too.

    Syntax

    void gl.drawArraysInstanced(mode, first, count, instanceCount);

    Parameters

    mode
    A GLenum specifying the type primitive to render. Possible values are:
    • gl.POINTS: Draws a single dot.
    • gl.LINE_STRIP: Draws a straight line to the next vertex.
    • gl.LINE_LOOP: Draws a straight line to the next vertex, and connects the last vertex back to the first.
    • gl.LINES: Draws a line between a pair of vertices.
    • gl.TRIANGLE_STRIP
    • gl.TRIANGLE_FAN
    • gl.TRIANGLES: Draws a triangle for a group of three vertices.
    first
    A GLint specifying the starting index in the array of vector points.
    count
    A GLsizei specifying the number of indices to be rendered.
    instanceCount
    A GLsizei specifying the number of instances of the range of elements to execute.

    Return value

    None.

    Examples

    gl.drawArraysInstanced(gl.POINTS, 0, 8, 4);

    Specifications

    Specification Status Comment
    WebGL 2.0
    The definition of 'drawArraysInstanced' in that specification.    		 Editor's Draft Initial definition for WebGL.
    OpenGL ES 3.0
    The definition of 'glDrawArraysInstanced' in that specification.    		 Standard Man page of the (similar) OpenGL API.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support No support [2] Nightly build [1] No support No support No support
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support No support No support No support No support No support No support

    [1] WebGL 2 is enabled by default in Firefox Nightly. To enable it in a release version of Firefox, set the preference webgl.enable-prototype-webgl2 to true in about:config.

    [2] To use an experimental implementation of WebGL 2 in Chrome, you have to start Chrome with the runtime flag --enable-unsafe-es3-apis.

    See also

    Document Tags and Contributors

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     Contributors to this page: fscholz
     Last updated by: fscholz,