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Only build tested for I830 generation.
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This way we have a hw context so that we can take the hardware lock.
Also, at this point, AIGLX isn't locked with the X server context as it is
at screen creation.
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Don't place buffer objects on unfenced list when newly created.
Fix a buffer object wait-for-idle deadlock.
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Since the recent renderbuffer refcounting fixes it's no longer sufficient to
just remove the old renderbuffer from the framebuffer and then add the new one
because the former may decrease the reference count to 0 and delete the old
renderbuffer.
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Use _mesa_reference_framebuffer() and _mesa_unreference_framebuffer() functions
to be sure reference counting is done correctly. Additional assertions are
done too. Note _mesa_dereference_framebuffer() renamed to "unreference" as
that's more accurate.
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call _mesa_dereference_framebuffer instead of _mesa_dereference_framebuffer
in i810, i915, i915tex, i965 drivers.
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Also move vsync related state from context to window, so it's possible to
schedule several flips ahead of time with triple buffering.
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Pending flips are tracked per renderbuffer and the colour renderbuffer
attachments of window framebuffer objects are rotated on flips to avoid
stalling the pipeline for pending flips unnecessarily.
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No longer track page flipping state per context but per window, via struct
intel_framebuffer which wraps struct gl_framebuffer for windows.
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This may not be the proper way to fix this but it does work easily.
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