84 lines
2.5 KiB
Rust
84 lines
2.5 KiB
Rust
//! Configure a renderer.
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pub use crate::Antialiasing;
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/// The settings of a [`Backend`].
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///
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/// [`Backend`]: crate::Backend
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub struct Settings {
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/// The output format of the [`Backend`].
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///
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/// [`Backend`]: crate::Backend
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pub format: wgpu::TextureFormat,
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/// The present mode of the [`Backend`].
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///
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/// [`Backend`]: crate::Backend
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pub present_mode: wgpu::PresentMode,
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/// The internal graphics backend to use.
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pub internal_backend: wgpu::BackendBit,
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/// The bytes of the font that will be used by default.
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///
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/// If `None` is provided, a default system font will be chosen.
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pub default_font: Option<&'static [u8]>,
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/// The default size of text.
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///
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/// By default, it will be set to 20.
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pub default_text_size: u16,
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/// The antialiasing strategy that will be used for triangle primitives.
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pub antialiasing: Option<Antialiasing>,
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}
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impl Settings {
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/// Creates new [`Settings`] using environment configuration.
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///
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/// Specifically:
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///
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/// - The `internal_backend` can be configured using the `WGPU_BACKEND`
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/// environment variable. If the variable is not set, the primary backend
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/// will be used. The following values are allowed:
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/// - `vulkan`
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/// - `metal`
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/// - `dx12`
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/// - `dx11`
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/// - `gl`
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/// - `webgpu`
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pub fn from_env() -> Self {
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Settings {
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internal_backend: backend_from_env()
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.unwrap_or(wgpu::BackendBit::PRIMARY),
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..Self::default()
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}
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}
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}
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impl Default for Settings {
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fn default() -> Settings {
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Settings {
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format: wgpu::TextureFormat::Bgra8UnormSrgb,
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present_mode: wgpu::PresentMode::Mailbox,
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internal_backend: wgpu::BackendBit::PRIMARY,
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default_font: None,
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default_text_size: 20,
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antialiasing: None,
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}
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}
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}
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fn backend_from_env() -> Option<wgpu::BackendBit> {
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std::env::var("WGPU_BACKEND").ok().map(|backend| {
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match backend.to_lowercase().as_str() {
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"vulkan" => wgpu::BackendBit::VULKAN,
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"metal" => wgpu::BackendBit::METAL,
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"dx12" => wgpu::BackendBit::DX12,
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"dx11" => wgpu::BackendBit::DX11,
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"gl" => wgpu::BackendBit::GL,
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"webgpu" => wgpu::BackendBit::BROWSER_WEBGPU,
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other => panic!("Unknown backend: {}", other),
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}
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})
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}
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