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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