Limited availability
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.
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>
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