[Mesa-dev] can we have gl_framebuffer _NumColorDrawBuffers = 1 and all the entries in the array NULL

[Marek Olšák]

Hi Dave,

Yes, it's legal. Drivers should handle NULL color buffer bindings and
there is a test for it:
http://cgit.freedesktop.org/piglit/commit/?id=ff2398a4e3c4805e7d1bea38f4ae6f9811b42ede

I fixed it just recently.

That said, I think we don't have to bind NULL color buffers which
appear at the end of the color buffer list.

Marek

On Tue, Jan 28, 2014 at 7:33 AM, Dave Airlie <airlied at gmail.com> wrote:
>  I've just been playing with layered rendering on r600g and the depth
> test Marek wrote, and I noticed I'm sometimes getting a gallium
> framebuffer state with 1 cbuf but no defined cbuf,
>
> this comes direct from the Mesa state in the gl_framebuffer object, is
> this legal?
>
> Dave.
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