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

WebGL ANGLE_instanced_arrays Khronos Ratified Extension Specification