EXT frag depth

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.

Examples

Enable the extension:

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:

<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	Status	Comment
EXT_frag_depth The definition of 'EXT_frag_depth' in that specification.	Recommendation	Initial definition.

Browser compatibility

See also

• WebGLRenderingContext.getExtension()