WIP: wayland: add basic support for non-RGBA textureswip/nielsdg/add-yuv-support-gnome-3-32

Up until now, we didn't support sending YUV textures to the Wayland
server. This was for several reasons:

* We draw onto an RGBA framebuffer, so any other color format needs to
be converted to that color space. Since we don't want to lose a lot of
performance, this is ideally done on the GPU (using shaders).
* YUV formats can consist of several planes (for example NV12, a common
format in decoded video frames consists of a Y-plane and a subsampled
UV-plane). Mutter always assumed that any texture it got was
representable by a `CoglTexture`, which does not have this kind of
concept.

To deal with this, we introduce a new "texture": a
`CoglMultiPlaneTexture` which consists of multiple CoglTextures, each
representing a plane in the texture we got. It also provides support
for CoglSnippets which can convert the colorspace if necessary.

What changes are in this commit:
* Introduce a new CoglMultiPlaneTexture object. Right now it is not
implemented as a CoglTexture to prevent any confusion (but it is
somewhat related to CoglMetaTexture)
* Added some extra values to the CoglPixelFormat enum that deal with YUV
* Make the necessary changes in MetaWaylandBuffer, so that it knows how
to deal with incoming buffers (for example EGLImages and shm buffers)
* This also introduces some changes in MetaDmaBuf, as that is also a
different kind of buffer we can receive from wayland.

Acknowledgements
* There was a lot of prior art already done by the authors of Weston,
CoglGstVideoSink and ClutterGstSink
* My employer Barco for allowing me to work on this

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compositor/meta-shaped-texture-private.h b/src/compositor/meta-shaped-texture-private.h
index a86a2bff0..43be08127 100644
--- a/src/compositor/meta-shaped-texture-private.h
+++ b/src/compositor/meta-shaped-texture-private.h
@@ -32,7 +32,7 @@
 
 ClutterActor *meta_shaped_texture_new (void);
 void meta_shaped_texture_set_texture (MetaShapedTexture *stex,
-                                      CoglTexture       *texture);
+                                      CoglMultiPlaneTexture *texture);
 void meta_shaped_texture_set_is_y_inverted (MetaShapedTexture *stex,
                                             gboolean           is_y_inverted);
 void meta_shaped_texture_set_snippet (MetaShapedTexture *stex,