1511322 - Use IDCompositionSurface instead of IDXGISwapChain when DirectComposition is used in RenderCompositorANGLE

Status: RESOLVED INCOMPLETE

(Core :: Graphics: WebRender, enhancement)

Description

[Sotaro Ikeda [:sotaro]]

It seems better to investigate for using IDCompositionSurface instead of IDXGISwapChain when DirectComposition is used. It might get better performance.

Comment 1

[Sotaro Ikeda [:sotaro]]

Current RenderCompositorANGLE uses just IDXGISwapChain, since it could be used for both with/without DirectComposition.

Comment 2

[Sotaro Ikeda [:sotaro]]

Attachment: wip

Comment 3

[Sotaro Ikeda [:sotaro]]

With attachment 9029533 [details] [diff] [review], I tested IDCompositionSurface usage. It had 2 problem.
- [1] Content was slide down a bit.
     To address the problem, needed to call mVisual->SetOffsetY() to adjust offset.
- [2] performance of http://arodic.github.io/p/jellyfish/ was worse than swap chain with triple buffering.
    It was better than swap chain with double buffering.
    attachment 9029533 [details] [diff] [review] request to call mCompositionDevice->Commit() for every rendering.
    The Commit() does actual task for very call during IDCompositionSurface usage. It seeed to add more tasks.