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//! Configure a renderer.
pub use crate::Antialiasing;
use crate::Font;
/// The settings of a [`Backend`].
///
/// [`Backend`]: crate::Backend
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Settings {
/// The present mode of the [`Backend`].
///
/// [`Backend`]: crate::Backend
pub present_mode: wgpu::PresentMode,
/// The internal graphics backend to use.
pub internal_backend: wgpu::Backends,
/// The default [`Font`] to use.
pub default_font: Font,
/// The default size of text.
///
/// By default, it will be set to `16.0`.
pub default_text_size: f32,
/// The antialiasing strategy that will be used for triangle primitives.
///
/// By default, it is `None`.
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`
/// - `primary`
pub fn from_env() -> Self {
Settings {
internal_backend: backend_from_env()
.unwrap_or(wgpu::Backends::all()),
..Self::default()
}
}
}
impl Default for Settings {
fn default() -> Settings {
Settings {
present_mode: wgpu::PresentMode::AutoVsync,
internal_backend: wgpu::Backends::all(),
default_font: Font::SansSerif,
default_text_size: 16.0,
antialiasing: None,
}
}
}
fn backend_from_env() -> Option<wgpu::Backends> {
std::env::var("WGPU_BACKEND").ok().map(|backend| {
match backend.to_lowercase().as_str() {
"vulkan" => wgpu::Backends::VULKAN,
"metal" => wgpu::Backends::METAL,
"dx12" => wgpu::Backends::DX12,
"dx11" => wgpu::Backends::DX11,
"gl" => wgpu::Backends::GL,
"webgpu" => wgpu::Backends::BROWSER_WEBGPU,
"primary" => wgpu::Backends::PRIMARY,
other => panic!("Unknown backend: {other}"),
}
})
}
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