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[Impeller] Implement framebuffer fetch via subpass in Vulkan. #128911

@chinmaygarde

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@chinmaygarde

This is available in the Metal backend for "free". We work around this today in Vulkan by using multiple render passes. But this is extremely slow. For instance, the the pull quotes in the Wondrous app are really pretty bad without this optimization.

We need framebuffer fetch in Vulkan.

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P2Important issues not at the top of the work liste: impellerImpeller rendering backend issues and features requestsengineflutter/engine related. See also e: labels.team-engineOwned by Engine teamtriaged-engineTriaged by Engine team

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