Render Backend

Forcing Software Rendering:

By default, Iced tries to use wgpu as the backend, and if that is not possible, it uses tiny-skia as a fallback software renderer.

If you want to specifically use tiny-skia as render backend, you can do that temporarily by setting the ICED_BACKEND environment variable to tiny-skia, e.g.

ICED_BACKEND=tiny-skia cargo run

A more permanent solution can be achieved by disabling default features and re-enabling everything you need except for wgpu:

[dependencies]
iced = { version = "0.14", default-features = false, features = [
    "tiny-skia",
    "x11",
    "wayland",
    "smol",
    "image"
] }

Selecting a Graphics Backend for WGPU:

For Hardware Accelerated Rendering(i.e. Using a GPU to render) Iced uses WGPU.

WGPU by itself can use various graphics APIs like OpenGL, Vulkan, DirectX, Metal, etc.

To force a specific graphics backend for WGPU you can set an environemnt variable WGPU_BACKEND = vulkan:

# /path/to/project/.cargo/config.toml

[env]
WGPU_BACKEND = "vulkan" # It can have these values: dx12 / vulkan / metal / gl