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Re: [Public WebGL] writing to OES_texture_float

On Thu, Dec 16, 2010 at 6:39 AM, Daniel Koch <daniel@transgaming.com> wrote:
> 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.

I scanned through ES 2.0 spec and found no text discussing
color-renderable formats for textures.  I could only find such
information for renderbuffers.

Could anyone point to me the section?

Thanks a lot!


> Hope this helps,
> Daniel
> On 2010-12-16, at 7:51 AM, Evgeny Demidov wrote:
> one can write into the RGBA OES_texture_float (good news)
> http://www.ibiblio.org/e-notes/webgl/barkley_ext.html
> (OpenGL/ANGLE score is about 170/60)
> but I failed to write into the LUMINANCE_ALPHA texture (is it RG in OpenGL
> 3.3 ?)
> http://www.ibiblio.org/e-notes/webgl/barkley_e2.html
> I tried both
>   out vec2 FragColor;
> ...
>   FragColor = vec2(unew, vnew );
> and
>   gl_FragColor = vec4(unew, unew, unew, vnew );
> Couldn't Kenneth Russell look the last script (near the commented lines)?
> Evgeny
> ---
>                         Daniel Koch -+- daniel@transgaming.com
> Senior Graphics Architect -+- TransGaming Inc.  -+- www.transgaming.com

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