WebGLRenderingContext.clear()

The WebGLRenderingContext.clear() method of the WebGL API clears buffers to preset values.

The preset values can be set by clearColor(), clearDepth() or clearStencil().

The scissor box, dithering, and buffer writemasks can affect the clear() method.

Syntax

JavaScript
void <var>gl</var>.clear(<var>mask</var>);

Parameters

mask
A GLbitfield bitwise OR mask that indicates the buffers to be cleared. Possible values are:
  • gl.COLOR_BUFFER_BIT
  • gl.DEPTH_BUFFER_BIT
  • gl.STENCIL_BUFFER_BIT

Errors thrown

If mask is not one of the listed possible values, a gl.INVALID_ENUM error is thrown.

Return value

None.

Examples

The clear() method accepts multiple values.

JavaScript
gl.clear(gl.DEPTH_BUFFER_BIT);
gl.clear(gl.DEPTH_BUFFER_BIT | gl.COLOR_BUFFER_BIT);

To get the current clear values, query the COLOR_CLEAR_VALUE, DEPTH_CLEAR_VALUE, and STENCIL_CLEAR_VALUE constants.

JavaScript
gl.getParameter(gl.COLOR_CLEAR_VALUE);
gl.getParameter(gl.DEPTH_CLEAR_VALUE);
gl.getParameter(gl.STENCIL_CLEAR_VALUE);

Specifications

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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 9 4.0 (2.0) 11 12 5.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? 25 (Yes) ? 12 8.1

See also

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/webglrenderingcontext/clear

API Method Reference WebGL WebGLRenderingContext