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 not 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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support912411125.1
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes25 Yes Yes128.1 Yes

See also

Document Tags and Contributors

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