[Bug 106601] The internal format RGB32F should be color-renderable for texture, But mesa can not support it

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106601

--- Comment #11 from Tapani Pälli <lemody at gmail.com> ---
(In reply to Yunchao He from comment #10)
> (In reply to Tapani Pälli from comment #8)
> > What comes to conformance, you should refer to latest OpenGL spec (now being
> > 4.6). In this case you want to render to RGB32F we should take a look at
> > section  "9.2.5 Required Renderbuffer Formats". Since you are using a sized
> > format, it means you need to check if driver is required to support this
> > from column 'Req. rend" as said in 9.2.5.
> > 
> > That said, IMO this bug should be considered a feature request (which is
> > fine) rather than a missing feature.
> 
> Sorry. Maybe the description is not clear. The issue we raised is to render
> into a RGB32F format texture, not RGB32F format renderbuffer. 
> 
> For the latest OpenGL 4.6 spec, RGB32F internalformat is required by
> texture, see Table 8.12 in GL 4.6 spec. So I think it is a missing feature
> in mesa for Intel devices.

'Req. tex.' column in that table means that texture mapping with this format
should work (sample from in a shader),  it does *not* mean that rendering to
such format should work, for that there is column 'Req. rend.'.

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