Avoid conflicting client/server wayland includes

This avoids including wayland-server.h in cogl-display-private.h which
avoid lots of compile time warnings that wl_buffer is deprecated. The
problem is that wl_buffer is also exposed in the client side headers and
isn't deprecated for clients. If we end up including the client and
server headers in the same compilation unit we can get conflicting
definitions.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 60fcd9c87cf5d8ae8c41134217ee0e1fa2fbd46e)
conform: check we invalidate ancestor cached state

In the cases where we cache vertex state with an ancestor pipeline (whose
vertex processing state is equivalent) we need to invalidate that state
if that ancestor is later modified.

This conformance test checks this case but currently fails because we
only notify the progend directly associated with the pipeline being
changed.

In this case the pipeline can be using a different progend to the
ancestor which it is caching state with so when the ancestor is changed
it needs to notify all the progends that they may need to clear their
private state.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit e112af5f770d6c46688fdcb5ba38b75ca0778891)
pipeline: notify all progends of changes

When a pipeline is notified of a change we now make sure to notify all
progends of that change not just the progend directly associated with
that pipeline. A pipeline can have private state associated with it from
multiple progends because descendants will always try and cache state on
ancestors to maximize the chance that the state can later be re-used.
Descendants may be using different progends than the ancestors that they
cache state with.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 873939a18934185fb3c9c84c373cb86d1278add7)
util: simplify _COGL_STATIC_ASSERT definition

This updates the definition of _COGL_STATIC_ASSERT to just use
_Static_assert if available or be NOP if not. We no longer worry about
supporting static assertions with older compilers. This fixes some
verbose warnings that newer compilers were giving with the old typedef
based static assertion method.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 645e3607ea7f210d6dcb9d217204790051de7c82)
framebuffer: NOP _set_color_mask if mask isn't changing

This makes cogl_framebuffer_set_color_mask immediately bail out if the
given mask equals the framebuffer's current mask, since the cost of
flushing the journal and flushing the gl state will hugely outweigh the
cost of the check.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 925174d99df7f1f4b11098e748bcc23eaa396a21)
cogl.symbols: Make Sure cogl_is_atlas_texture is Exported

cogl_is_atlas_texture is supposed to be exported from the DLL/.so, so
update the cogl.symbols file to ensure this.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
(cherry picked from commit 13e037f096de5742db769500b4c0018249d8f8e4)
egl: forward declare wl_resource for compatibility

Depending on what version of Mesa you have then eglQueryWaylandBuffer
may take a wl_buffer or wl_resource argument and the EGL header will
only forward declare the corresponding type.

The use of wl_buffer has been deprecated and so internally we assume
that eglQueryWaylandBuffer takes a wl_resource but for compatibility we
forward declare wl_resource in case we are building with EGL headers
that still use wl_buffer.

https://bugzilla.gnome.org/show_bug.cgi?id=710926

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 9bd1ee544667cfe7ecae479ec7f778446dd8f326)
Add API to control per-framebuffer depth writing

Add framebuffer methods cogl_framebuffer_[gs]et_depth_write_enabled()
and backend bits to pass the state on to glDepthMask().

This allows us to enable or disable depth writing per-framebuffer, which
if disabled saves us some work in glClear(). When rendering, the flag
is combined with the pipeline's depth writing flag using a logical AND.

Depth writing is enabled by default.

https://bugzilla.gnome.org/show_bug.cgi?id=709827

Reviewed-by: Robert Bragg <robert@linux.intel.com>
(cherry picked from commit 71406438c5357eb4e0ef03e940c5456a536602a0)