WEBGL_draw_buffers.drawBuffersWEBGL()

The WEBGL_draw_buffers.drawBuffersWEBGL() method is part of the WebGL API and allows you to define the draw buffers to which all fragment colors are written.

This method is part of the WEBGL_draw_buffers extension.

Note: When using WebGL2, this method is available as gl.drawBuffers() by default and the constants are named gl.COLOR_ATTACHMENT1 etc. without the "WEBGL" suffix.

Syntax

void gl.getExtension('WEBGL_draw_buffers').drawBuffersWEBGL(buffers);

Parameters

buffers
An Array of GLenum constants defining drawing buffers. Possible values:
  • gl.NONE: The fragment shader is not written to any color buffer.
  • gl.BACK: The fragment shader is written to the back color buffer.
  • ext.COLOR_ATTACHMENT0_WEBGL The fragment shader is written the the nth color attachment of the framebuffer.
  • ext.COLOR_ATTACHMENT1_WEBGL
  • ext.COLOR_ATTACHMENT2_WEBGL
  • ext.COLOR_ATTACHMENT3_WEBGL
  • ext.COLOR_ATTACHMENT4_WEBGL
  • ext.COLOR_ATTACHMENT5_WEBGL
  • ext.COLOR_ATTACHMENT6_WEBGL
  • ext.COLOR_ATTACHMENT7_WEBGL
  • ext.COLOR_ATTACHMENT8_WEBGL
  • ext.COLOR_ATTACHMENT9_WEBGL
  • ext.COLOR_ATTACHMENT10_WEBGL
  • ext.COLOR_ATTACHMENT11_WEBGL
  • ext.COLOR_ATTACHMENT12_WEBGL
  • ext.COLOR_ATTACHMENT13_WEBGL
  • ext.COLOR_ATTACHMENT14_WEBGL
  • ext.COLOR_ATTACHMENT15_WEBGL

Return value

None.

Examples

See WEBGL_draw_buffers for more context with this example code.

ext.drawBuffersWEBGL([
  ext.COLOR_ATTACHMENT0_WEBGL, // gl_FragData[0]
  ext.COLOR_ATTACHMENT1_WEBGL, // gl_FragData[1]
  ext.COLOR_ATTACHMENT2_WEBGL, // gl_FragData[2]
  ext.COLOR_ATTACHMENT3_WEBGL  // gl_FragData[3]
]);

Specifications

Specification Status Comment
WEBGL_draw_buffers
The definition of 'WEBGL_draw_buffers' in that specification.		 Recommendation Initial definition.
OpenGL ES 3.0
The definition of 'glDrawBuffers' in that specification.		 Standard Man page of the (similar) OpenGL API.

Browser compatibility

FeatureChromeFirefoxEdgeInternet ExplorerOperaSafari
Basic Support?

(Yes) — 28.0 MOZ_ 1

28.0

(No)???
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support??(No)????

1. Until version 28.0 (exclusive): this feature is behind the webgl.enable-draft-extensions preference (needs to be set to true). To change preferences in Firefox, visit about:config.

See also

Document Tags and Contributors

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