The spec. is not unclear. The extension spec. does not amend
Section 4.4.5 of the core OpenGL ES 2.0 spec. which includes
The following internal formats are color-renderable: RGB565, RGBA4, and RGB5 A1. No other formats, including compressed internal formats, are color-renderable.
and similar limitations on which formats are depth- and
If WebGL's version of OES_float_texture is allowing floating
point textures to be renderable, then it is a different extension
and it needs to document all the relevant interactions. If it is
intended to be the same as OES_float_texture then allowing the
float texture to be color-renderable is a bug.
Thanks. If the spec is too unclear for you to support attaching float textures to FBOs, then maybe we should explicitly disallow that in WebGL, for portability's sake.
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