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

[Henri Verbeet]

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.