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[Public WebGL] stencilFuncSeparate and stencilMaskSeparate



The WebGL-specific limitations imposed on stencilFuncSeparate and
stencilMaskSeparate in
https://cvs.khronos.org/svn/repos/registry/trunk/public/webgl/doc/spec/WebGL-spec.html#6.5
imply that these entry points are now useless. If it isn't possible to
change the front or back reference or mask value to something
different than the other, then these entry points can't be used to
change those values for either face. Doing so must generate
INVALID_OPERATION. stencilFunc and stencilMask must be used instead.

Rather than adding useless logic to WebGL implementations (see
https://bugs.webkit.org/show_bug.cgi?id=48669), should we just remove
these entry points for the time being?

-Ken
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