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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描述

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 :)

贡献者指南

技术栈: rust
领域: desktopperformance
议题类型: feature
难度: 4
预计时间: over 1 week
活动状态: stale
清晰度: mostly clear
前置要求: rust programminggraphics API knowledge (Vulkan/EGL)familiarity with iced architecturedamage tracking concepts
新手友好度: 20
研究方向: 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.