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slint/examples/wgpu_texture/README.md
Simon Hausmann da5e7d5b22 WGPU: Add support for using WGPU textures in Slint 
This adds a `unstable-wgpu-24` feature that exposes WGPU types in the
GraphicsAPI enum, adds `require_wgpu_24()` to the backend selector,
and adds a conversion from `wgpu::Texture` to `slint::Image`.

The `require_wgpu_24()` function in the selector will be extended in the
future (before the next release) to permit specifying additional aspects
of the WGPU configuration.

Co-Authored-By: Olivier Goffart <olivier.goffart@slint.dev>
2025-04-29 17:46:57 +02:00

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WGPU Texture Import Example

This example application demonstrates how import a WGPU texture into a Slint scene:

  1. First a graphical effect is rendered using WGPU, into a texture.
  2. The texture is imported into a slint::Image and set on an Image element.
  3. A scene of Slint elements is rendered with the texture shown in the Image.

This is implemented using the set_rendering_notifier function on the slint::Window type. It takes a callback as a parameter and that is invoked during different phases of the rendering. In this example the invocation during the setup phase is used to prepare the pipeline for WGPU rendering later. Then the BeforeRendering phase is used to render the graphical effect with WGPU into a texture. Then the texture is imported and Slint will render the scene of elements with the texture.

Since the graphical effect is continuous, the code in the callback requests a redraw of the contents by calling slint::Window::request_redraw().