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

Feature Chrome Edge Firefox Internet Explorer Opera Safari Servo
Basic Support??28.0????
Feature Android Chrome for Android Edge Mobile Firefox for Android IE Mobile Opera Mobile Safari Mobile
Basic Support???????

See also

Document Tags and Contributors

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