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frontends/va: add support for VA_EXPORT_SURFACE_COMPOSED_LAYERS

Simon Ser requested to merge emersion/mesa:va-composed into master

The libva docs say:

If VA_EXPORT_SURFACE_SEPARATE_LAYERS is specified on export, each layer will contain exactly one plane. For example, an NV12 surface will be exported as two layers, one of DRM_FORMAT_R8 and one of DRM_FORMAT_GR88. If VA_EXPORT_SURFACE_COMPOSED_LAYERS is specified on export, there will be exactly one layer.

VA_EXPORT_SURFACE_COMPOSED_LAYERS is desirable in many scenarios, for instance when directly importing the DMA-BUFs into APIs such as GL (as a single EGLImage), KMS or Wayland.

Signed-off-by: Simon Ser's avatarSimon Ser contact@emersion.fr

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