Re: [Public WebGL] writing to OES_texture_float

[Evgeny Demidov <demidov@ipm.sci-nnov.ru>]

> OES_texture_float doesn't actually define the ability to render to 
> floating point textures.  We do happen to support that in ANGLE, but 
> it is not a portable behaviour (and will almost certainly not work on 
> true ES devices).
>
> LUMINANCE_ALPHA textures are also not renderable in ES 2.0 (and are 
> not in ANGLE).  May desktop GL implementations made them renderable 
> before RG textures were introduced, but that was more of a silent 
> extension, not a requirement.   You should be able to check this via a 
> framebuffer completeness test.
>
> Hope this helps,
> Daniel
1. Chromium and Firefox (+- ANGLE) render to gl.UNSIGNED_BYTE texures 
with gl.LUMINANCE, RGB and RGBA (I didn't use LUMINANCE_ALPHA yet). 
Shell I mark these apps as extensions?  :(
2. I tested that one can render to OES_texture_float with gl.RGB. Is it 
a bug?
3. barkley_e2.html hangs with LUMINANCE_ALPHA and does not with LUMINANCE..
Shall one write only to FBO with RGBA textures?

Evgeny
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