TheANGLE_instanced_arrays.drawElementsInstancedANGLE() method of theWebGL API renders primitives from array data like thegl.drawElements() method. In addition, it can execute multiple instances of a set of elements.

Syntax

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

Parameters

mode

AGLenum 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

AGLsizei specifying the number of elements to be rendered.

type

AGLenum 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 theOES_element_index_uint extension.

offset

AGLintptr specifying an offset in the element array buffer. Must be a valid multiple of the size of the giventype.

primcount

AGLsizei specifying the number of instances of the set of elements to execute.

Return value

None (undefined).

Exceptions

• Ifmode is not one of the accepted values, agl.INVALID_ENUM error is thrown.
• Ifoffset is an invalid multiple of the size of the given type, agl.INVALID_OPERATION error is thrown.
• Ifcount orprimcount are negative, agl.INVALID_VALUE error is thrown.

Examples

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

Specifications

Browser compatibility

See also

• ext.drawArraysInstancedANGLE()
• ext.vertexAttribDivisorANGLE()
• WebGLRenderingContext.drawArrays()
• WebGLRenderingContext.drawElements()
• WebGL2RenderingContext.drawArraysInstanced()
• WebGL2RenderingContext.drawElementsInstanced()
• WebGL2RenderingContext.vertexAttribDivisor()
• WEBGL_multi_draw.multiDrawElementsInstancedWEBGL()