Would it make sense to be able to select the graphics API to use at runtime, instead o

Runtime API Selection about rafx HOT 2 CLOSED

zicklag commented on July 17, 2024

Runtime API Selection

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Comments (2)

aclysma commented on July 17, 2024

Add the feature flags you want (such as rafx-vulkan,rafx-gles3) and use the API-specific init functions such as RafxApi::new_vulkan or RafxApi::new_gles3. RafxApi::new demonstrates this and probably does what you want by default.

rafx/rafx-api/src/api.rs

Lines 63 to 88 in 0a49546

 pub unsafe fn new( 

 _window: &dyn HasRawWindowHandle, 

 _api_def: &RafxApiDef, 

 ) -> RafxResult<Self> { 

 #[cfg(feature = "rafx-metal")] 

 { 

 return RafxApi::new_metal(_window, _api_def, &Default::default()); 

 } 

 #[cfg(feature = "rafx-vulkan")] 

 { 

 return RafxApi::new_vulkan(_window, _api_def, &Default::default()); 

 } 

 #[cfg(feature = "rafx-gles3")] 

 { 

 return RafxApi::new_gles3(_window, _api_def, &Default::default()); 

 } 

 #[cfg(feature = "rafx-gles2")] 

 { 

 return RafxApi::new_gles2(_window, _api_def, &Default::default()); 

 } 

 return Err("Rafx was compiled with no backend feature flag. Use on of the following features: rafx-metal, rafx-vulkan, rafx-gles2")?; 

 }

Long term, API selection could be made by having a config file that explicitly pairs PCI device IDs/driver versions with APIs (for example to ban an old GPU from vulkan if it is known to have a buggy driver). This could also be used to enable/disable rendering settings based on the performance of that particular GPU. This is outside the scope of this project for the time being and is a fairly opinionated thing.

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zicklag commented on July 17, 2024

Oh, cool, I didn't realize it would work with multiple backends enabled at the same time. Perfect!

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Runtime API Selection about rafx HOT 2 CLOSED

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	pub unsafe fn new(
	_window: &dyn HasRawWindowHandle,
	_api_def: &RafxApiDef,
	) -> RafxResult<Self> {
	#[cfg(feature = "rafx-metal")]
	{
	return RafxApi::new_metal(_window, _api_def, &Default::default());
	}

	#[cfg(feature = "rafx-vulkan")]
	{
	return RafxApi::new_vulkan(_window, _api_def, &Default::default());
	}

	#[cfg(feature = "rafx-gles3")]
	{
	return RafxApi::new_gles3(_window, _api_def, &Default::default());
	}

	#[cfg(feature = "rafx-gles2")]
	{
	return RafxApi::new_gles2(_window, _api_def, &Default::default());
	}

	return Err("Rafx was compiled with no backend feature flag. Use on of the following features: rafx-metal, rafx-vulkan, rafx-gles2")?;
	}