WebGL2RenderingContext.drawBuffers()

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The WebGL2RenderingContext.drawBuffers() method of the WebGL 2 API defines draw buffers to which fragment colors are written into. The draw buffer settings are part of the state of the currently bound framebuffer or the drawingbuffer if no framebuffer is bound.

Syntax

JavaScript
void <var>gl</var>.drawBuffers(<var>buffers</var>);

Parameters

buffers
An Array of GLenum specifying the buffers into which fragment colors will be written. Possible values are:
  • gl.NONE: Fragment shader output is not written into any color buffer.
  • gl.BACK: Fragment shader output is written into the back color buffer.
  • gl.COLOR_ATTACHMENT{0-15}: Fragment shader output is written in the nth color attachment of the current framebuffer.

Return value

None.

Exceptions

  • If buffers contains not one of the accepted values, a gl.INVALID_ENUM error is thrown.

Examples

JavaScript
gl.drawBuffers([gl.NONE, gl.COLOR_ATTACHMENT1]);

Specifications

Specification Status Comment
WebGL 2.0
The definition of 'drawBuffers' in that specification.		 Editor's Draft Initial definition for WebGL.
OpenGL ES 3.0
The definition of 'glDrawBuffers' in that specification.		 Standard Man page of the (similar) OpenGL API.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support [2] Nightly build [1] No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support No support No support No support No support

[1] WebGL 2 is enabled by default in Firefox Nightly. To enable it in a release version of Firefox, set the preference webgl.enable-prototype-webgl2 to true in about:config.

[2] To use an experimental implementation of WebGL 2 in Chrome, you have to start Chrome with the runtime flag --enable-unsafe-es3-apis.

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/webgl2renderingcontext/drawbuffers

API Experimental Method Reference WebGL WebGL2