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GeezerVison is showing github.com — Implement `background` method by tychedelia · Pull Request #1308 · processing/processing4

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tychedelia commented Oct 27, 2025

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Allows setting the background clear color in a sketch.

Changes:

Adds a camera when spawning a window. Note that we also add a RenderLayers component, which we'll also need to attach to any geometry spawned to render in that window. This is just hygiene for eventual multi-window apps.
Adds a simple Color FFI struct. We'll likely want to make this more complicated later or support all the color spaces that bevy does (even if processing doesn't). But this demonstrates how to do allocations on the Java side.

I didn't implement the PImage override here as that will require the actual renderer (i.e. not just a clear color). It's also possible the semantics here are wrong. I think processing may allow you to clear multiple times in a frame, which means drawing a fullscreen quad not setting the render pass clear. But we can follow up with that once more rendering infra is implemented.

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          Implement background.

907ff07

tychedelia changed the base branch from main to the-wgpu-moment

October 27, 2025 21:02


          Install wayland deps.

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catilac commented Nov 7, 2025

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Hi! What is a good way to test this?

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tychedelia commented Nov 10, 2025

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Hi! What is a good way to test this?

You can create a sketch that sets the background color (:

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catilac approved these changes

Nov 10, 2025

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it works! and noted on the multiple clear calls.

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catilac merged commit 89f8a65 into processing:the-wgpu-moment

Nov 10, 2025

catilac added a commit that referenced this pull request

Jul 8, 2026


          Merge WebGPU backend (#1514)

25bca44

* *:ꔫ:*Renderer Project*:ꔫ:*

* Create workspaces for ffi and the renderer (#1275)

* Inital scaffold for libprocessing ffi.

* Remove EAP.

* Update docs.

* Factor out gradle utils. Add flag for disabling webgpu and enforcing android source level compat.

* Remove processing.h

* Set java version for all projects.

* libprocessing ffi error handling (#1293)

* FFI error setup

* Clear before init.

* Basic app lifecycle / surface creation.

* Throw when not on macos.

* Implement `background` method (#1308)

* Implement background.

* Install wayland deps.

* Support for windows surfaces. (#1310)

* Implement basic rendering flow (#1322)

* Implement basic rendering flow

* Fix naming.

* Actually fix rename.

* libprocessing submodule

* --recursive when cloning repo

* Enable submodule checkout in Gradle workflow

Added support for submodules in the checkout step.

* Enable submodules in checkout steps

Added submodule support to the checkout steps.

* Wayland support with new WebGPU renderer

* Gradle fixes from libprocessing refactor. (#1346)

* Updates from libprocessing. (#1392)

* Updates from libprocessing.

* Fixes for compat with main 17.

* Fixup docs.

* Upgrade to jdk-25.

* Upgrade to jdk-25.

* Materials, lights, input event forwarding, ellipse fix.

* Get the gradle sketch runner working locally.

* Conditionally execute webgpu tests

* ProcessingLibraryPlugin JVM Toggle update

* 4.5.5 in gradle.properties

* ProcessingPlugin fixes

---------

Co-authored-by: Moon D. <[email protected]>
Co-authored-by: Moon <[email protected]>
Co-authored-by: Stef Tervelde <[email protected]>

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catilac

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