Struct MTKTextureLoader

Source

#[repr(C)]
pub struct MTKTextureLoader { /* private fields */ }

Available on crate feature MTKTextureLoader only.

Expand description

Load Metal textures from files with the device specified at initialization

Implementations§

Source §

impl MTKTextureLoader

Source

pub unsafe fn device(&self) -> Retained<ProtocolObject<dyn MTLDevice>>

Metal device with which to create Metal textures

Source

pub unsafe fn init(this: Allocated<Self>) -> Retained<Self>

Source

pub unsafe fn initWithDevice( this: Allocated<Self>, device: &ProtocolObject<dyn MTLDevice>, ) -> Retained<Self>

Initialize the loader

Parameter device: Metal device with which to create Metal textures

Source

pub unsafe fn newTextureWithContentsOfURL_options_completionHandler( &self, url: &NSURL, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, completion_handler: MTKTextureLoaderCallback, )

Available on crate feature block2 only.

Asynchronously create a Metal texture and load image data from the file at URL

Parameter URL: Location of image file from which to create the texture

Parameter options: Dictonary of MTKTextureLoaderOptions

Parameter completionHandler: Block called when the texture has been loaded and fully initialized

Source

pub unsafe fn newTextureWithName_scaleFactor_bundle_options_completionHandler( &self, name: &NSString, scale_factor: CGFloat, bundle: Option<&NSBundle>, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, completion_handler: MTKTextureLoaderCallback, )

Available on crate features block2 and objc2-core-foundation only.

Asynchronously create a Metal texture and load image data from a given texture or image asset name

Parameter name: A texture or image asset name

Parameter scaleFactor: scale factor of the texture to retrieve from the asset catalog. Typically the value retrieved from -[UIView contentScale] or -[NSWindow backingScaleFactor].

Parameter bundle: Resource bundle in which the asset is located. Main bundle used if nil.

Parameter options: Dictonary of MTKTextureLoaderOptions. The following options are ignormed when used to load a texture asset but can be used when creating a texture from an image asset: MTKTextureLoaderOptionGenerateMipmaps MTKTextureLoaderOptionSRGB MTKTextureLoaderOptionCubeFromVerticalTexture MTKTextureLoaderOptionOrigin

Parameter completionHandler: Block called when texture has been loaded and fully initialized

Uses texture data from version of the texture from the texture set in the asset catalog which mathces the device’s traits. This method attempts to load a texture asset with thw name iven. If a texture asset with the name given does not exist, it will attempt to create a texture from an image asset with the given name

Source

pub unsafe fn newTexturesWithContentsOfURLs_options_completionHandler( &self, ur_ls: &NSArray<NSURL>, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, completion_handler: MTKTextureLoaderArrayCallback, )

Available on crate feature block2 only.

Asynchronously create an array of Metal textures and load image data from the files at URLs

Parameter URLs: Locations of image files from which to create the textures

Parameter options: Dictonary of MTKTextureLoaderOptions, which will be used for every texture loaded

Parameter completionHandler: Block called when all of the textures have been loaded and fully initialized. The array of MTLTextures will be the same length and in the same order as the requested array of paths. If an error occurs while loading a texture, the corresponding array index will contain NSNull. The NSError will be null if all of the textures are loaded successfully, or will correspond to one of the textures which failed to load.

Source

pub unsafe fn newTexturesWithNames_scaleFactor_bundle_options_completionHandler( &self, names: &NSArray<NSString>, scale_factor: CGFloat, bundle: Option<&NSBundle>, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, completion_handler: MTKTextureLoaderArrayCallback, )

Available on crate features block2 and objc2-core-foundation only.

Asynchronously create Metal textures and load image data from a given texture or image asset names

Parameter names: An array texture or image asset names. If an error occurs while loading a texture, the corresponding index in the returned array contain [NSNull null]

Parameter scaleFactor: scale factor of the texture to retrieve from the asset catalog. Typically the value retrieved from -[UIView contentScale] or -[NSWindow backingScaleFactor].

Parameter bundle: Resource bundle in which the assets are located. Main bundle used if nil.

Parameter options: Dictonary of MTKTextureLoaderOptions. The following options are ignormed when used to load a texture asset but can be used when creating a texture from an image asset MTKTextureLoaderOptionGenerateMipmaps MTKTextureLoaderOptionSRGB MTKTextureLoaderOptionCubeFromVerticalTexture MTKTextureLoaderOptionOrigin

Parameter completionHandler: Block called when all of the textures have been loaded and fully initialized. The NSError will be null if all of the textures are loaded successfully, or will correspond to one of the textures which failed to load.

Uses texture data from version of the texture from the texture set in the asset catalog which mathces the device’s traits. This method attempts to load a texture asset with each name iven. If a texture asset with the name given does not exist, it will attempt to create a texture from an image asset with the given name.

Source

pub unsafe fn newTextureWithData_options_completionHandler( &self, data: &NSData, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, completion_handler: MTKTextureLoaderCallback, )

Available on crate feature block2 only.

Asynchronously create a Metal texture and load image data from the NSData object provided

Parameter data: NSData object containing image file data from which to create the texture

Parameter options: Dictonary of MTKTextureLoaderOptions

Parameter completionHandler: Block called when texture has been loaded and fully initialized

Source

pub unsafe fn newTextureWithCGImage_options_completionHandler( &self, cg_image: &CGImage, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, completion_handler: MTKTextureLoaderCallback, )

Available on crate features block2 and objc2-core-graphics only.

Asynchronously create a Metal texture and load image data from the given CGImageRef

Parameter cgImage: CGImageRef containing image data from which to create the texture

Parameter options: Dictonary of MTKTextureLoaderOptions

Parameter completionHandler: Block called when texture has been loaded and fully initialized

Source

pub unsafe fn newTextureWithMDLTexture_options_completionHandler( &self, texture: &MDLTexture, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, completion_handler: MTKTextureLoaderCallback, )

Available on crate features block2 and objc2-model-io only.

Asynchronously create a Metal texture and load image data from the given MDLTexture

Parameter texture: MDLTexture containing image data from which to create the texture

Parameter options: Dictonary of MTKTextureLoaderOptions

Parameter completionHandler: Block called when texture has been loaded and fully initialized

Source

pub unsafe fn newTextureWithContentsOfURL_options_error( &self, url: &NSURL, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, ) -> Result<Retained<ProtocolObject<dyn MTLTexture>>, Retained<NSError>>

Synchronously create a Metal texture and load image data from the file at URL

Returns: The Metal texture. nil if an error occured

Parameter URL: Location of image file from which to create the texture

Parameter options: Dictonary of MTKTextureLoaderOptions

Parameter error: Pointer to an autoreleased NSError object which will be set if an error occurred

Source

pub unsafe fn newTextureWithData_options_error( &self, data: &NSData, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, ) -> Result<Retained<ProtocolObject<dyn MTLTexture>>, Retained<NSError>>

Synchronously create a Metal texture and load image data from the NSData object provided

Returns: The Metal texture. nil if an error occured

Parameter data: NSData object containing image file data from which to create the texture

Parameter options: Dictonary of MTKTextureLoaderOptions

Parameter error: Pointer to an autoreleased NSError object which will be set if an error occurred

Source

pub unsafe fn newTextureWithCGImage_options_error( &self, cg_image: &CGImage, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, ) -> Result<Retained<ProtocolObject<dyn MTLTexture>>, Retained<NSError>>

Available on crate feature objc2-core-graphics only.

Synchronously create a Metal texture and load image data from the given CGImageRef

Returns: The Metal texture. nil if an error occured

Parameter cgImage: CGImageRef containing image data from which to create the texture

Parameter options: Dictonary of MTKTextureLoaderOptions

Parameter error: Pointer to an autoreleased NSError object which will be set if an error occurred

Source

pub unsafe fn newTextureWithMDLTexture_options_error( &self, texture: &MDLTexture, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, ) -> Result<Retained<ProtocolObject<dyn MTLTexture>>, Retained<NSError>>

Available on crate feature objc2-model-io only.

Synchronously create a Metal texture and load image data from the given MDLTexture

Returns: The Metal texture. nil if an error occured

Parameter texture: MDLTexture containing image data from which to create the texture

Parameter options: Dictonary of MTKTextureLoaderOptions

Parameter error: Pointer to an autoreleased NSError object which will be set if an error occurred

Source

pub unsafe fn newTextureWithName_scaleFactor_bundle_options_error( &self, name: &NSString, scale_factor: CGFloat, bundle: Option<&NSBundle>, options: Option<&NSDictionary<MTKTextureLoaderOption, AnyObject>>, ) -> Result<Retained<ProtocolObject<dyn MTLTexture>>, Retained<NSError>>

Available on crate feature objc2-core-foundation only.

Synchronously create a Metal texture with texture data from a given texture or image asset name

Returns: The Metal texture. nil if an error occured

Parameter names: An array of texture asset names

Parameter scaleFactor: scale factor of the texture to retrieve from the asset catalog. Typically the value retrieved from -[UIView contentScale] or -[NSWindow backingScaleFactor].

Parameter bundle: Resource bundle in which the asset is located. Main bundle used if nil.

Parameter options: Dictonary of MTKTextureLoaderOptions. The following options are ignormed when used to load a texture asset but can be used when creating a texture from an image asset MTKTextureLoaderOptionGenerateMipmaps MTKTextureLoaderOptionSRGB MTKTextureLoaderOptionCubeFromVerticalTexture MTKTextureLoaderOptionOrigins

Uses texture data from version of the texture from the texture set in the asset catalog which mathces the device’s traits. This method attempts to load a texture asset with the name given. If a texture asset with the name given does not exist, it will attempt to create a texture from an image asset with the given name.

Source §

impl MTKTextureLoader

Methods declared on superclass NSObject.

Source

pub unsafe fn new() -> Retained<Self>

Methods from Deref<Target = NSObject>§

Source

pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !

Handle messages the object doesn’t recognize.

See Apple’s documentation for details.

Methods from Deref<Target = AnyObject>§

Source

pub fn class(&self) -> &'static AnyClass

Dynamically find the class of this object.

§Example

Check that an instance of NSObject has the precise class NSObject.

use objc2::ClassType;
use objc2::runtime::NSObject;

let obj = NSObject::new();
assert_eq!(obj.class(), NSObject::class());

Source

pub unsafe fn get_ivar<T>(&self, name: &str) -> &T
where T: Encode,

👎Deprecated: this is difficult to use correctly, use Ivar::load instead.

Use Ivar::load instead.

§Safety

The object must have an instance variable with the given name, and it must be of type T.

See Ivar::load_ptr for details surrounding this.

Source

pub fn downcast_ref<T>(&self) -> Option<&T>
where T: DowncastTarget,

Attempt to downcast the object to a class of type T.

This is the reference-variant. Use Retained::downcast if you want to convert a retained object to another type.

§Mutable classes

Some classes have immutable and mutable variants, such as NSString and NSMutableString.

When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.

So using this method to convert a NSString to a NSMutableString, while not unsound, is generally frowned upon unless you created the string yourself, or the API explicitly documents the string to be mutable.

See Apple’s documentation on mutability and on isKindOfClass: for more details.

§Generic classes

Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.

You can, however, safely downcast to generic collections where all the type-parameters are AnyObject.

§Panics

This works internally by calling isKindOfClass:. That means that the object must have the instance method of that name, and an exception will be thrown (if CoreFoundation is linked) or the process will abort if that is not the case. In the vast majority of cases, you don’t need to worry about this, since both root objects NSObject and NSProxy implement this method.

§Examples

Cast an NSString back and forth from NSObject.

use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};

let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();

Try (and fail) to cast an NSObject to an NSString.

use objc2_foundation::{NSObject, NSString};

let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());

Try to cast to an array of strings.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();

This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.

Downcast when processing each element instead.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);

for elem in arr {
    if let Some(data) = elem.downcast_ref::<NSString>() {
        // handle `data`
    }
}