There is a 3rd requirement that blocks the usability of FP rendering: ReadPixels. The proposed extensions add RGBA, float as the combination that can be used for FP buffers.
OES_texture_float and OES_texture_half_float say that some implementations may support rendering to these types. However the rest of the WebGL specification contains requirements that make the FP rendering somewhat less than useful. To whit:
- Color parameters to blendColor and clearColor are clamped to [0,1].
- Fragment shader outputs are theoretically clamped to [0,1].
At present you have to track back to the underlying OpenGL ES
OES_color_buffer_half_float to see that as it requires no new
tokens. I'll add a comment to the Overview.
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