Note that the ES 2.0 specifications clamping behavior is modified by http://www.khronos.org/registry/gles/extensions/EXT/EXT_color_buffer_half_float.txt in that output, blend and clear clamps are removed when the target is floating point.That's one way of looking at it. But formally the clamps on the BlendColor and ClearColor parameters are removed - the parameters' type becomes GLfloat not GLclampf - and clamping is applied at draw time iff the target is fixed-point. An implementation supporting EXT_color_buffer_half_float will have this behavior.
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