[Mesa-dev] [PATCH 0/10] i965: Implement hiz and separate stencil for window framebuffer

[Eric Anholt]

On Sun, 05 Jun 2011 10:44:17 +0100, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> I have a naive question: why are we allocating stencil/depth/aux buffers
> through X/DRI2?
> 
> I can understand for the sake of interoperability why the color buffer
> attachments are negotiated with X, but I can't see any reason why X
> wants to know about the others.
> -Chris

From the GLX 1.4 specification:

         Ancillary buffers are associated with a GLXDrawable, not with a
         rendering context. If several rendering contexts are all
         writing to the same window, they will share those buffers.

This is why so much of GLX is so painful -- even across address spaces,
drawables have to share buffers.
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