Damage tracking / partial present · iced-rs/iced#367

2020-05-29T00:02:34.000Z

[Damage tracking](https://emersion.fr/blog/2019/intro-to-damage-tracking/) allows for power savings by not rerendering regions unchanged between frames. There's actually two optimizations made possible by tracking damage: in the desktop compositor (you just tell it the region) and in the application (a bit more tricky, but e.g. [I've implemented support in WebRender+EGL](https://phabricator.services.mozilla.com/D61062) recently). Doesn't look like wgpu supports passing the `VkPresentRegionKHR` yet, so I've raised an issue for this: https://github.com/gfx-rs/wgpu/issues/682 On the new GL backend though, it should be possible to use `EGL_KHR_swap_buffers_with_damage` ([e.g.](https://phabricator.services.mozilla.com/D51517)). But first, iced should do the actual tracking :)

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Description

Damage tracking allows for power savings by not rerendering regions unchanged between frames. There's actually two optimizations made possible by tracking damage: in the desktop compositor (you just tell it the region) and in the application (a bit more tricky, but e.g. I've implemented support in WebRender+EGL recently).

Doesn't look like wgpu supports passing the VkPresentRegionKHR yet, so I've raised an issue for this: https://github.com/gfx-rs/wgpu/issues/682

On the new GL backend though, it should be possible to use EGL_KHR_swap_buffers_with_damage (e.g.).

But first, iced should do the actual tracking :)

Contributor guide

Tech stack: rust
Domain: desktopperformance
Issue type: feature
Difficulty: 4
Estimated time: over 1 week
Activity status: stale
Clarity: mostly clear
Prerequisites: rust programminggraphics API knowledge (Vulkan/EGL)familiarity with iced architecturedamage tracking concepts
Newbie friendliness: 20
Research direction: Start by reading the blog post on damage tracking linked in the issue. Then, examine the wgpu issue #682 for Vulkan presentation region support. Explore the existing GL backend code in iced to see if EGL KHR swap buffers with damage can be used. Understand iced's frame rendering pipeline to determine where to track damage regions. No existing PRs or comments provide additional direction.