WebGLRenderingContext.drawElements()

The WebGLRenderingContext.drawElements() method of the WebGL API renders primitives from array data.

Syntax

void gl.drawElements(mode, count, type, offset);

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

Return value

None.

Exceptions

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

Examples

gl.drawElements(gl.POINTS, 8, gl.UNSIGNED_BYTE, 0);

Specifications

Specification Status Comment
WebGL 1.0
The definition of 'drawElements' in that specification.
Recommendation Initial definition.
OpenGL ES 2.0
The definition of 'glDrawElements' in that specification.
Standard Man page of the OpenGL API.

Browser compatibility

Feature Chrome Edge Firefox Internet Explorer Opera Safari Servo
Basic Support9124.011125.1No support
Feature Android Chrome for Android Edge Mobile Firefox for Android IE Mobile Opera Mobile Safari Mobile
Basic Support(Yes)25(Yes)4.011128.1

See also

Document Tags and Contributors

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