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
void gl.drawBuffers(buffers);
Parameters
buffers- An
ArrayofGLenumspecifying 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
bufferscontains not one of the accepted values, agl.INVALID_ENUMerror is thrown.
Examples
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.