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[Public WebGL] Implement extension EXT_frag_depth in WebGL



Its been mentioned several times before, however I'd like to request that WEBGL_frag_depth be added to the extensions.

http://www.khronos.org/registry/gles/extensions/EXT/EXT_frag_depth.txt

Previous mentions:

gl_FragDepth and the focus of WebGL
https://www.khronos.org/webgl/public-mailing-list/archives/1204/msg00033.html 

Dynamic loops and gl_FragDepth access in fragment shader
https://www.khronos.org/webgl/public-mailing-list/archives/1201/msg00142.html

As mentioned in follow up by Florian Bösch:
This is a useful capability in circumstances where raycasting, raytracing, path-tracing, paralax-mapping, signed distance fields, impostors etc. are involved and rendered together with rasterized geometry.