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Introduce internal_backend to iced_wgpu::Settings

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This commit is contained in:
Héctor Ramón Jiménez 2021-03-25 11:27:31 +01:00
parent ab8dcf91bd
commit 883c7e71ae
4 changed files with 52 additions and 41 deletions
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41
wgpu/src/settings.rs
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@ -16,6 +16,9 @@ pub struct Settings {
/// [`Backend`]: crate::Backend
pub present_mode: wgpu::PresentMode,
/// The internal graphics backend to use.
pub internal_backend: wgpu::BackendBit,
/// The bytes of the font that will be used by default.
///
/// If `None` is provided, a default system font will be chosen.
@ -30,14 +33,52 @@ pub struct Settings {
pub antialiasing: Option<Antialiasing>,
}
impl Settings {
/// Creates new [`Settings`] using environment configuration.
///
/// Specifically:
///
/// - The `internal_backend` can be configured using the `WGPU_BACKEND`
/// environment variable. If the variable is not set, the primary backend
/// will be used. The following values are allowed:
/// - `vulkan`
/// - `metal`
/// - `dx12`
/// - `dx11`
/// - `gl`
/// - `webgpu`
pub fn from_env() -> Self {
Settings {
internal_backend: backend_from_env()
.unwrap_or(wgpu::BackendBit::PRIMARY),
..Self::default()
}
}
}
impl Default for Settings {
fn default() -> Settings {
Settings {
format: wgpu::TextureFormat::Bgra8UnormSrgb,
present_mode: wgpu::PresentMode::Mailbox,
internal_backend: wgpu::BackendBit::PRIMARY,
default_font: None,
default_text_size: 20,
antialiasing: None,
}
}
}
fn backend_from_env() -> Option<wgpu::BackendBit> {
std::env::var("WGPU_BACKEND").ok().map(|backend| {
match backend.to_lowercase().as_str() {
"vulkan" => wgpu::BackendBit::VULKAN,
"metal" => wgpu::BackendBit::METAL,
"dx12" => wgpu::BackendBit::DX12,
"dx11" => wgpu::BackendBit::DX11,
"gl" => wgpu::BackendBit::GL,
"webgpu" => wgpu::BackendBit::BROWSER_WEBGPU,
other => panic!("Unknown backend: {}", other),
}
})
}