ID3D11DeviceCreateDeferredContext

ID3D11DeviceCreateDeferredContext is a function in the Direct3D 11 API used to create a deferred context. A deferred context is an object that allows for the recording of rendering commands on a separate thread from the main rendering thread. This is a key feature for improving performance by decoupling command generation from command execution.

When ID3D11DeviceCreateDeferredContext is called, it returns an ID3D11DeviceContext interface that is specifically designed for deferred operations. Unlike a immediate context, which executes commands as soon as they are issued, a deferred context accumulates commands in a command buffer. These recorded commands can then be played back on the main rendering thread using the ExecuteCommandList method of an immediate device context.

The primary benefit of using deferred contexts is to offload the work of preparing rendering commands from the CPU-bound main thread. This can be particularly advantageous in scenarios with complex scenes or many independent rendering tasks, allowing the main thread to focus on other aspects of the application, such as game logic or user interface updates, while a worker thread handles the command recording.

The returned deferred context can be used to set pipelines, issue draw calls, and perform other typical rendering operations. Once the recording is complete, the gathered commands are encapsulated in an ID3D11CommandList object, which is then passed to the immediate context for execution. This asynchronous command recording and execution model is a powerful tool for optimizing Direct3D 11 applications.