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Support choosing wgpu backend using env var

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Downtime 2021-03-21 11:42:25 +08:00 committed by Héctor Ramón Jiménez
parent 2b520ca098
commit ab8dcf91bd
1 changed files with 40 additions and 1 deletions
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41
wgpu/src/window/compositor.rs
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@ -15,6 +15,35 @@ pub struct Compositor {
local_pool: futures::executor::LocalPool,
}
#[derive(Clone)]
pub enum WgpuBackend {
Auto,
Vulkan,
Metal,
Dx12,
Dx11,
Gl,
BrowserWgpu,
}
impl WgpuBackend {
fn from_env() -> Self {
if let Ok(backend) = std::env::var("WGPU_BACKEND") {
match backend.to_lowercase().as_str() {
"vulkan" => WgpuBackend::Vulkan,
"metal" => WgpuBackend::Metal,
"dx12" => WgpuBackend::Dx12,
"dx11" => WgpuBackend::Dx11,
"gl" => WgpuBackend::Gl,
"webgpu" => WgpuBackend::BrowserWgpu,
other => panic!("Unknown backend: {}", other),
}
} else {
WgpuBackend::Auto
}
}
}
impl Compositor {
const CHUNK_SIZE: u64 = 10 * 1024;
@ -22,7 +51,17 @@ impl Compositor {
///
/// Returns `None` if no compatible graphics adapter could be found.
pub async fn request(settings: Settings) -> Option<Self> {
let instance = wgpu::Instance::new(wgpu::BackendBit::PRIMARY);
let backend = match WgpuBackend::from_env() {
WgpuBackend::Auto => wgpu::BackendBit::PRIMARY,
WgpuBackend::Vulkan => wgpu::BackendBit::VULKAN,
WgpuBackend::Metal => wgpu::BackendBit::METAL,
WgpuBackend::Dx12 => wgpu::BackendBit::DX12,
WgpuBackend::Dx11 => wgpu::BackendBit::DX11,
WgpuBackend::Gl => wgpu::BackendBit::GL,
WgpuBackend::BrowserWgpu => wgpu::BackendBit::BROWSER_WEBGPU,
};
let instance = wgpu::Instance::new(backend);
let adapter = instance
.request_adapter(&wgpu::RequestAdapterOptions {