monado/doc/mermaid/swapchain_allocation_ipc.mmd

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%% Copyright 2024, Collabora, Ltd. and the Monado contributors
%% SPDX-License-Identifier: BSL-1.0
%% Out of process, typical behavior (server-side allocation)
sequenceDiagram
box Client Process
participant app
participant cc as client compositor
participant client_native as client process<br/>native compositor<br/>(IPC Stub)
end
box Server Process
participant server_ipc_handler as Server IPC handler
participant server_comp as Server xrt_compositor_native
end
app->>+cc: xrCreateSwapchain
cc->>+client_native: xrt_comp_create_swapchain
client_native->>+server_ipc_handler: xrt_comp_create_swapchain<br/>(IPC call)
server_ipc_handler->>+server_comp: xrt_comp_create_swapchain
server_comp->>-server_ipc_handler: xrt_swapchain impl
server_ipc_handler->>-client_native: swapchain ID and<br/>image handles<br/>(over IPC)
client_native->>-cc: return ipc_swapchain<br/>as inner xrt_swapchain
Note over cc: Keep reference to inner xrt_swapchain in<br>the object we create
Note over cc: Import handles from<br/>inner xrt_swapchain into client API
cc->>-app: return swapchain