message VideoTarget

Where a client must render a frame for the compositor to sample it without a copy through the CPU: which GPU, and which layouts of DRM_FORMAT_ABGR8888 that GPU can import.

The client allocates on renderNode because a dma-buf from another GPU is a buffer this device cannot read — on a laptop with two, that is the usual way to get it wrong. modifiers is what the compositor can blit from; the client's allocator picks one it can also render to.