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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.
Availability: 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:
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
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | ? | 30.0 (30.0) | ? | ? | ? |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | ? | ? | ? | ? | ? | ? |