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# Objective Rewrite screenshotting to be able to accept any `RenderTarget`. Closes #12478 ## Solution Previously, screenshotting relied on setting a variety of state on the requested window. When extracted, the window's `swap_chain_texture_view` property would be swapped out with a texture_view created that frame for the screenshot pipeline to write back to the cpu. Besides being tightly coupled to window in a way that prevented screenshotting other render targets, this approach had the drawback of relying on the implicit state of `swap_chain_texture_view` being returned from a `NormalizedRenderTarget` when view targets were prepared. Because property is set every frame for windows, that wasn't a problem, but poses a problem for render target images. Namely, to do the equivalent trick, we'd have to replace the `GpuImage`'s texture view, and somehow restore it later. As such, this PR creates a new `prepare_view_textures` system which runs before `prepare_view_targets` that allows a new `prepare_screenshots` system to be sandwiched between and overwrite the render targets texture view if a screenshot has been requested that frame for the given target. Additionally, screenshotting itself has been changed to use a component + observer pattern. We now spawn a `Screenshot` component into the world, whose lifetime is tracked with a series of marker components. When the screenshot is read back to the CPU, we send the image over a channel back to the main world where an observer fires on the screenshot entity before being despawned the next frame. This allows the user to access resources in their save callback that might be useful (e.g. uploading the screenshot over the network, etc.). ## Testing  TODO: - [x] Web - [ ] Manual texture view --- ## Showcase render to texture example: <img src="https://github.com/user-attachments/assets/612ac47b-8a24-4287-a745-3051837963b0" width=200/> web saving still works: <img src="https://github.com/user-attachments/assets/e2a15b17-1ff5-4006-ab2a-e5cc74888b9c" width=200/> ## Migration Guide `ScreenshotManager` has been removed. To take a screenshot, spawn a `Screenshot` entity with the specified render target and provide an observer targeting the `ScreenshotCaptured` event. See the `window/screenshot` example to see an example. --------- Co-authored-by: Kristoffer Søholm <k.soeholm@gmail.com> |
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