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7087f0c01f
Adds a `BindingResource` variant for external textures. In core's create_bind_group() implementation, allow binding either external textures or texture views to `BindingType::ExternalTexture` layout entries. In either case, provide HAL with a `hal::ExternalTextureBinding`, consisting of 3 `hal::TextureBinding`s and a `hal::BufferBinding`. In the texture view case we use the device's default params buffer for the buffer. When there are fewer than 3 planes we can simply repeat an existing plane multiple times - the contents of the params buffer will ensure the shader only accesses the correct number of planes anyway. Track the view or external texture in `BindGroupStates` to ensure they remain alive whilst required. And finally, add the corresponding API to wgpu, with an implementation for the wgpu-core backend.