ANGLE_instanced_arrays: drawArraysInstancedANGLE() method

The ANGLE_instanced_arrays.drawArraysInstancedANGLE() method of the WebGL 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 WebGL2, this method is available as gl.drawArraysInstanced() by default.

Syntax

drawArraysInstancedANGLE(mode, first, count, primcount)

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.

• primcount

  • : A GLsizei specifying the number of instances of the range of elements to execute.

Return value

None (undefined).

Exceptions

• If mode is not one of the accepted values, a gl.INVALID_ENUM error is thrown.
• If first, count or primcount are negative, a gl.INVALID_VALUE error is thrown.
• if gl.CURRENT_PROGRAM is null, a gl.INVALID_OPERATION error is thrown.

Examples

const ext = gl.getExtension("ANGLE_instanced_arrays");
ext.drawArraysInstancedANGLE(gl.POINTS, 0, 8, 4);

Specifications

Browser compatibility

See also

• ext.drawElementsInstancedANGLE()
• ext.vertexAttribDivisorANGLE()
• drawArrays()
• drawElements()
• drawArraysInstanced()
• drawElementsInstanced()
• vertexAttribDivisor()
• multiDrawArraysInstancedWEBGL()