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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/ANGLE_instanced_arrays/drawElementsInstancedANGLE below:

ANGLE_instanced_arrays: drawElementsInstancedANGLE() method - Web APIs

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The ANGLE_instanced_arrays.drawElementsInstancedANGLE() method of the WebGL API renders primitives from array data like the gl.drawElements() method. In addition, it can execute multiple instances of a set of elements.

Note: When using WebGL2, this method is available as gl.drawElementsInstanced() by default.

drawElementsInstancedANGLE(mode, count, type, offset, primcount)

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.

count

A GLsizei specifying the number of elements to be rendered.

type

A GLenum specifying the type of the values in the element array buffer. Possible values are:

• gl.UNSIGNED_BYTE
• gl.UNSIGNED_SHORT
• gl.UNSIGNED_INT when using the OES_element_index_uint extension.

offset

A GLintptr specifying an offset in the element array buffer. Must be a valid multiple of the size of the given type.

primcount

A GLsizei specifying the number of instances of the set of elements to execute.

None (undefined).

• If mode is not one of the accepted values, a gl.INVALID_ENUM error is thrown.
• If offset is an invalid multiple of the size of the given type, a gl.INVALID_OPERATION error is thrown.
• If count or primcount are negative, a gl.INVALID_VALUE error is thrown.

const ext = gl.getExtension("ANGLE_instanced_arrays");
ext.drawElementsInstancedANGLE(gl.POINTS, 2, gl.UNSIGNED_SHORT, 0, 4);

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