EXT_frag_depth extension

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The EXT_frag_depth extension is part of the WebGL API and enables to set a depth value of a fragment from within the fragment shader.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

Note: This extension is only available to WebGL1 contexts. In WebGL2, the functionality of this extension is available on the WebGL2 context by default. It requires GLSL #version 300 es.

Examples

Enable the extension:

js
gl.getExtension("EXT_frag_depth");

Now the output variable gl_FragDepthEXT is available to set a depth value of a fragment from within the fragment shader:

html
<script type="x-shader/x-fragment">
  void main() {
    gl_FragColor = vec4(1.0, 0.0, 1.0, 1.0);
    gl_FragDepthEXT = 0.5;
  }
</script>

Specifications

Specification
WebGL EXT_frag_depth Khronos Ratified Extension Specification

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
EXT_frag_depth

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support

See also