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How can Use dFdx and dFdy in IE ( Internet Explorer 11+)


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Just a guess on my part.


I do not see the dFdx functions listed in my "WebGL Programming Guide",  copyright 2013, "Built-in Functions of GLSL ES 1.0".  Perhaps this is in OpenGL ES 3.0.


Is there even a WebGL spec based off that yet?


Finally, I thought at this level it was a graphic card driver, not a Browser one.

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