[Piglit] [PATCH 3/3 V2] GL 3.2: Test layered framebuffers clear the depth attachment properly.

[Paul Berry]

On 14 September 2013 09:25, Henri Verbeet <hverbeet at gmail.com> wrote:

> On 13 September 2013 23:40, Paul Berry <stereotype441 at gmail.com> wrote:
> > Looking at the specs yesterday, I *thought* the call is necessary in
> order
> > to ensure framebuffer completeness, since there's no color attachment to
> the
> > framebuffer.  In GL 3.2 (section 4.4.4 Framebuffer Completeness, under
> the
> > "Whole Framebuffer Completeness" section), the following is listed as a
> > criterion for framebuffer completeness:
> >
> > The value of FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE must not be
> > NONE for any color attachment point(s) named by DRAW_BUFFERi.
> >
> > { FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER }
> >
> >
> > However, maybe I'm interpreting the spec wrong, because neither Mesa nor
> the
> > NVIDIA proprietary driver requires the glDrawBuffer() call in order for
> the
> > framebuffer to be complete.
> >
> ARB_ES2_compatibility / GL 4.1 remove those completeness requirements,
> and make the behaviour as if the READ/DRAW buffer is NONE for missing
> attachments.
>

Ah, ok.  In that case I think we should go ahead and keep the
glDrawBuffer() call, just to make sure that the test works on
implementations that use the pre-GL-4.1 completeness rules.
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