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Fix cases in which instance creation may not create any context #5059

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merged 3 commits into from
Jan 15, 2024
Merged

Fix cases in which instance creation may not create any context #5059

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ba7cb20
Fix cases in which instance creation may not create any context
Wumpf Jan 14, 2024
ab4f862
split condition steps on picking webgpu instance
Wumpf Jan 15, 2024
ce17fc9
comment formulation fix on backend availability
Wumpf Jan 15, 2024
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18 changes: 12 additions & 6 deletions wgpu/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1718,6 +1718,7 @@ impl Instance {
///
/// Which feature makes this method return true depends on the target platform:
/// * MacOS/iOS: `metal`, `vulkan-portability` or `angle`
/// * Wasm32: `webgpu`, `webgl` or Emscripten target.
/// * All other: Always returns true
///
/// TODO: Right now it's otherwise not possible yet to opt-out of all features on most platforms.
Expand All @@ -1735,7 +1736,7 @@ impl Instance {
|| cfg!(feature = "angle")
// On the web, either WebGPU or WebGL must be enabled.
} else if cfg!(target_arch = "wasm32") {
cfg!(feature = "webgpu") || cfg!(feature = "webgl")
cfg!(feature = "webgpu") || cfg!(feature = "webgl") || cfg!(target_os = "emscripten")
} else {
true
}
Expand Down Expand Up @@ -1771,12 +1772,17 @@ impl Instance {
}

#[cfg(webgpu)]
if _instance_desc.backends.contains(Backends::BROWSER_WEBGPU)
&& crate::backend::get_browser_gpu_property().map_or(false, |gpu| !gpu.is_undefined())
{
return Self {
context: Arc::from(crate::backend::ContextWebGpu::init(_instance_desc)),
};
let is_only_available_backend = !cfg!(wgpu_core);
let requested_webgpu = _instance_desc.backends.contains(Backends::BROWSER_WEBGPU);
let support_webgpu =
crate::backend::get_browser_gpu_property().map_or(false, |gpu| !gpu.is_undefined());

if is_only_available_backend || (requested_webgpu && support_webgpu) {
return Self {
context: Arc::from(crate::backend::ContextWebGpu::init(_instance_desc)),
};
}
}

#[cfg(wgpu_core)]
Expand Down
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