apple.metalkit

Class MTKTextureLoader

java.lang.Object

org.moe.natj.general.NativeObject

org.moe.natj.objc.ObjCObject

apple.NSObject

apple.metalkit.MTKTextureLoader

All Implemented Interfaces:

NSObject

public class MTKTextureLoader
extends NSObject

MTKTextureLoader

Load Metal textures from files with the device specified at initialization

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	MTKTextureLoader.Block_newTexturesWithContentsOfURLsOptionsCompletionHandler
static interface	MTKTextureLoader.Block_newTexturesWithNamesScaleFactorBundleOptionsCompletionHandler
static interface	MTKTextureLoader.Block_newTextureWithCGImageOptionsCompletionHandler
static interface	MTKTextureLoader.Block_newTextureWithContentsOfURLOptionsCompletionHandler
static interface	MTKTextureLoader.Block_newTextureWithDataOptionsCompletionHandler
static interface	MTKTextureLoader.Block_newTextureWithMDLTextureOptionsCompletionHandler
static interface	MTKTextureLoader.Block_newTextureWithNameScaleFactorBundleOptionsCompletionHandler

Nested classes/interfaces inherited from class apple.NSObject

NSObject.Function_instanceMethodForSelector_ret, NSObject.Function_methodForSelector_ret

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MTKTextureLoader(org.moe.natj.general.Pointer peer)

Method Summary

Modifier and Type	Method and Description
static boolean	accessInstanceVariablesDirectly()
static MTKTextureLoader	alloc()
static MTKTextureLoader	allocWithZone(org.moe.natj.general.ptr.VoidPtr zone)
static boolean	automaticallyNotifiesObserversForKey(java.lang.String key)
static void	cancelPreviousPerformRequestsWithTarget(java.lang.Object aTarget)
static void	cancelPreviousPerformRequestsWithTargetSelectorObject(java.lang.Object aTarget, org.moe.natj.objc.SEL aSelector, java.lang.Object anArgument)
static NSArray<java.lang.String>	classFallbacksForKeyedArchiver()
static org.moe.natj.objc.Class	classForKeyedUnarchiver()
static java.lang.String	debugDescription_static()
static java.lang.String	description_static()
MTLDevice	device() [@property] device
static long	hash_static()
MTKTextureLoader	init()
MTKTextureLoader	initWithDevice(MTLDevice device) initWithDevice:
static NSObject.Function_instanceMethodForSelector_ret	instanceMethodForSelector(org.moe.natj.objc.SEL aSelector)
static NSMethodSignature	instanceMethodSignatureForSelector(org.moe.natj.objc.SEL aSelector)
static boolean	instancesRespondToSelector(org.moe.natj.objc.SEL aSelector)
static boolean	isSubclassOfClass(org.moe.natj.objc.Class aClass)
static NSSet<java.lang.String>	keyPathsForValuesAffectingValueForKey(java.lang.String key)
static MTKTextureLoader	new_objc()
void	newTexturesWithContentsOfURLsOptionsCompletionHandler(NSArray<? extends NSURL> URLs, NSDictionary<java.lang.String,?> options, MTKTextureLoader.Block_newTexturesWithContentsOfURLsOptionsCompletionHandler completionHandler) newTexturesWithContentsOfURLs:options:completionHandler:
NSArray<?>	newTexturesWithContentsOfURLsOptionsError(NSArray<? extends NSURL> URLs, NSDictionary<java.lang.String,?> options, org.moe.natj.general.ptr.Ptr<NSError> error) newTexturesWithContentsOfURLs:options:completionHandler:
void	newTexturesWithNamesScaleFactorBundleOptionsCompletionHandler(NSArray<java.lang.String> names, double scaleFactor, NSBundle bundle, NSDictionary<java.lang.String,?> options, MTKTextureLoader.Block_newTexturesWithNamesScaleFactorBundleOptionsCompletionHandler completionHandler) newTexturesWithNames:scaleFactor:bundle:options:completionHandler:
void	newTextureWithCGImageOptionsCompletionHandler(CGImageRef cgImage, NSDictionary<java.lang.String,?> options, MTKTextureLoader.Block_newTextureWithCGImageOptionsCompletionHandler completionHandler) newTextureWithCGImage:options:completionHandler:
MTLTexture	newTextureWithCGImageOptionsError(CGImageRef cgImage, NSDictionary<java.lang.String,?> options, org.moe.natj.general.ptr.Ptr<NSError> error) newTextureWithCGImage:options:error:
void	newTextureWithContentsOfURLOptionsCompletionHandler(NSURL URL, NSDictionary<java.lang.String,?> options, MTKTextureLoader.Block_newTextureWithContentsOfURLOptionsCompletionHandler completionHandler) newTextureWithContentsOfURL:options:completionHandler:
MTLTexture	newTextureWithContentsOfURLOptionsError(NSURL URL, NSDictionary<java.lang.String,?> options, org.moe.natj.general.ptr.Ptr<NSError> error) newTextureWithContentsOfURL:options:error:
void	newTextureWithDataOptionsCompletionHandler(NSData data, NSDictionary<java.lang.String,?> options, MTKTextureLoader.Block_newTextureWithDataOptionsCompletionHandler completionHandler) newTextureWithData:options:completionHandler:
MTLTexture	newTextureWithDataOptionsError(NSData data, NSDictionary<java.lang.String,?> options, org.moe.natj.general.ptr.Ptr<NSError> error) newTextureWithData:options:error:
void	newTextureWithMDLTextureOptionsCompletionHandler(MDLTexture texture, NSDictionary<java.lang.String,?> options, MTKTextureLoader.Block_newTextureWithMDLTextureOptionsCompletionHandler completionHandler) newTextureWithMDLTexture:options:completionHandler:
MTLTexture	newTextureWithMDLTextureOptionsError(MDLTexture texture, NSDictionary<java.lang.String,?> options, org.moe.natj.general.ptr.Ptr<NSError> error) newTextureWithMDLTexture:options:error:
void	newTextureWithNameScaleFactorBundleOptionsCompletionHandler(java.lang.String name, double scaleFactor, NSBundle bundle, NSDictionary<java.lang.String,?> options, MTKTextureLoader.Block_newTextureWithNameScaleFactorBundleOptionsCompletionHandler completionHandler) newTextureWithName:scaleFactor:bundle:options:completionHandler:
MTLTexture	newTextureWithNameScaleFactorBundleOptionsError(java.lang.String name, double scaleFactor, NSBundle bundle, NSDictionary<java.lang.String,?> options, org.moe.natj.general.ptr.Ptr<NSError> error) newTextursWithName:scaleFactor:bundle:options:error:
static boolean	resolveClassMethod(org.moe.natj.objc.SEL sel)
static boolean	resolveInstanceMethod(org.moe.natj.objc.SEL sel)
static void	setVersion_static(long aVersion)
static org.moe.natj.objc.Class	superclass_static()
static long	version_static()

Methods inherited from class apple.NSObject

accessibilityActivate, accessibilityActivationPoint, accessibilityAssistiveTechnologyFocusedIdentifiers, accessibilityAttributedHint, accessibilityAttributedLabel, accessibilityAttributedUserInputLabels, accessibilityAttributedValue, accessibilityContainerType, accessibilityCustomActions, accessibilityCustomRotors, accessibilityDecrement, accessibilityDragSourceDescriptors, accessibilityDropPointDescriptors, accessibilityElementAtIndex, accessibilityElementCount, accessibilityElementDidBecomeFocused, accessibilityElementDidLoseFocus, accessibilityElementIsFocused, accessibilityElements, accessibilityElementsHidden, accessibilityFrame, accessibilityHint, accessibilityIncrement, accessibilityLabel, accessibilityLanguage, accessibilityNavigationStyle, accessibilityPath, accessibilityPerformEscape, accessibilityPerformMagicTap, accessibilityRespondsToUserInteraction, accessibilityScroll, accessibilityTextualContext, accessibilityTraits, accessibilityUserInputLabels, accessibilityValue, accessibilityViewIsModal, addObserverForKeyPathOptionsContext, attemptRecoveryFromErrorOptionIndex, attemptRecoveryFromErrorOptionIndexDelegateDidRecoverSelectorContextInfo, autoContentAccessingProxy, awakeAfterUsingCoder, awakeFromNib, class_objc, classForCoder, classForKeyedArchiver, copy, dealloc, debugDescription, description, dictionaryWithValuesForKeys, didChangeValueForKey, didChangeValueForKeyWithSetMutationUsingObjects, didChangeValuesAtIndexesForKey, doesNotRecognizeSelector, fileManagerShouldProceedAfterError, fileManagerWillProcessPath, finalize_objc, forwardingTargetForSelector, forwardInvocation, hash, indexOfAccessibilityElement, isAccessibilityElement, isEqual, isKindOfClass, isMemberOfClass, isProxy, methodForSelector, methodSignatureForSelector, mutableArrayValueForKey, mutableArrayValueForKeyPath, mutableCopy, mutableOrderedSetValueForKey, mutableOrderedSetValueForKeyPath, mutableSetValueForKey, mutableSetValueForKeyPath, observationInfo, observeValueForKeyPathOfObjectChangeContext, performSelector, performSelectorInBackgroundWithObject, performSelectorOnMainThreadWithObjectWaitUntilDone, performSelectorOnMainThreadWithObjectWaitUntilDoneModes, performSelectorOnThreadWithObjectWaitUntilDone, performSelectorOnThreadWithObjectWaitUntilDoneModes, performSelectorWithObject, performSelectorWithObjectAfterDelay, performSelectorWithObjectAfterDelayInModes, performSelectorWithObjectWithObject, prepareForInterfaceBuilder, provideImageDataBytesPerRowOrigin_Size_UserInfo, removeObserverForKeyPath, removeObserverForKeyPathContext, replacementObjectForCoder, replacementObjectForKeyedArchiver, respondsToSelector, self, setAccessibilityActivationPoint, setAccessibilityAttributedHint, setAccessibilityAttributedLabel, setAccessibilityAttributedUserInputLabels, setAccessibilityAttributedValue, setAccessibilityContainerType, setAccessibilityCustomActions, setAccessibilityCustomRotors, setAccessibilityDragSourceDescriptors, setAccessibilityDropPointDescriptors, setAccessibilityElements, setAccessibilityElementsHidden, setAccessibilityFrame, setAccessibilityHint, setAccessibilityLabel, setAccessibilityLanguage, setAccessibilityNavigationStyle, setAccessibilityPath, setAccessibilityRespondsToUserInteraction, setAccessibilityTextualContext, setAccessibilityTraits, setAccessibilityUserInputLabels, setAccessibilityValue, setAccessibilityViewIsModal, setIsAccessibilityElement, setNilValueForKey, setObservationInfo, setShouldGroupAccessibilityChildren, setValueForKey, setValueForKeyPath, setValueForUndefinedKey, setValuesForKeysWithDictionary, shouldGroupAccessibilityChildren, superclass, validateValueForKeyError, validateValueForKeyPathError, valueForKey, valueForKeyPath, valueForUndefinedKey, willChangeValueForKey, willChangeValueForKeyWithSetMutationUsingObjects, willChangeValuesAtIndexesForKey

Methods inherited from class org.moe.natj.objc.ObjCObject

equals, toString

Methods inherited from class org.moe.natj.general.NativeObject

finalize, getPeer, getPeerPointer

Methods inherited from class java.lang.Object

clone, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MTKTextureLoader

protected MTKTextureLoader(org.moe.natj.general.Pointer peer)

Method Detail

accessInstanceVariablesDirectly

public static boolean accessInstanceVariablesDirectly()

alloc

public static MTKTextureLoader alloc()

allocWithZone

public static MTKTextureLoader allocWithZone(org.moe.natj.general.ptr.VoidPtr zone)

automaticallyNotifiesObserversForKey

public static boolean automaticallyNotifiesObserversForKey(java.lang.String key)

cancelPreviousPerformRequestsWithTarget

public static void cancelPreviousPerformRequestsWithTarget(java.lang.Object aTarget)

cancelPreviousPerformRequestsWithTargetSelectorObject

public static void cancelPreviousPerformRequestsWithTargetSelectorObject(java.lang.Object aTarget,
                                                                         org.moe.natj.objc.SEL aSelector,
                                                                         java.lang.Object anArgument)

classFallbacksForKeyedArchiver

public static NSArray<java.lang.String> classFallbacksForKeyedArchiver()

classForKeyedUnarchiver

public static org.moe.natj.objc.Class classForKeyedUnarchiver()

debugDescription_static

public static java.lang.String debugDescription_static()

description_static

public static java.lang.String description_static()

hash_static

public static long hash_static()

instanceMethodForSelector

public static NSObject.Function_instanceMethodForSelector_ret instanceMethodForSelector(org.moe.natj.objc.SEL aSelector)

instanceMethodSignatureForSelector

public static NSMethodSignature instanceMethodSignatureForSelector(org.moe.natj.objc.SEL aSelector)

instancesRespondToSelector

public static boolean instancesRespondToSelector(org.moe.natj.objc.SEL aSelector)

isSubclassOfClass

public static boolean isSubclassOfClass(org.moe.natj.objc.Class aClass)

keyPathsForValuesAffectingValueForKey

public static NSSet<java.lang.String> keyPathsForValuesAffectingValueForKey(java.lang.String key)

new_objc

public static MTKTextureLoader new_objc()

resolveClassMethod

public static boolean resolveClassMethod(org.moe.natj.objc.SEL sel)

resolveInstanceMethod

public static boolean resolveInstanceMethod(org.moe.natj.objc.SEL sel)

setVersion_static

public static void setVersion_static(long aVersion)

superclass_static

public static org.moe.natj.objc.Class superclass_static()

version_static

public static long version_static()

device

public MTLDevice device()

[@property] device

Metal device with which to create Metal textures

init

public MTKTextureLoader init()

Overrides:

init in class NSObject

initWithDevice

public MTKTextureLoader initWithDevice(MTLDevice device)

initWithDevice:

Initialize the loader

Parameters:

device - Metal device with which to create Metal textures

newTextureWithCGImageOptionsCompletionHandler

public void newTextureWithCGImageOptionsCompletionHandler(CGImageRef cgImage,
                                                          NSDictionary<java.lang.String,?> options,
                                                          MTKTextureLoader.Block_newTextureWithCGImageOptionsCompletionHandler completionHandler)

newTextureWithCGImage:options:completionHandler:

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

Parameters:

cgImage - CGImageRef containing image data from which to create the texture

options - Dictonary of MTKTextureLoaderOptions

completionHandler - Block called when texture has been loaded and fully initialized

newTextureWithCGImageOptionsError

public MTLTexture newTextureWithCGImageOptionsError(CGImageRef cgImage,
                                                    NSDictionary<java.lang.String,?> options,
                                                    org.moe.natj.general.ptr.Ptr<NSError> error)

newTextureWithCGImage:options:error:

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

Parameters:

cgImage - CGImageRef containing image data from which to create the texture

options - Dictonary of MTKTextureLoaderOptions

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

Returns:

The Metal texture. nil if an error occured

newTextureWithContentsOfURLOptionsCompletionHandler

public void newTextureWithContentsOfURLOptionsCompletionHandler(NSURL URL,
                                                                NSDictionary<java.lang.String,?> options,
                                                                MTKTextureLoader.Block_newTextureWithContentsOfURLOptionsCompletionHandler completionHandler)

newTextureWithContentsOfURL:options:completionHandler:

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

Parameters:

URL - Location of image file from which to create the texture

options - Dictonary of MTKTextureLoaderOptions

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

newTextureWithContentsOfURLOptionsError

public MTLTexture newTextureWithContentsOfURLOptionsError(NSURL URL,
                                                          NSDictionary<java.lang.String,?> options,
                                                          org.moe.natj.general.ptr.Ptr<NSError> error)

newTextureWithContentsOfURL:options:error:

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

Parameters:

URL - Location of image file from which to create the texture

options - Dictonary of MTKTextureLoaderOptions

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

Returns:

The Metal texture. nil if an error occured

newTextureWithDataOptionsCompletionHandler

public void newTextureWithDataOptionsCompletionHandler(NSData data,
                                                       NSDictionary<java.lang.String,?> options,
                                                       MTKTextureLoader.Block_newTextureWithDataOptionsCompletionHandler completionHandler)

newTextureWithData:options:completionHandler:

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

Parameters:

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

options - Dictonary of MTKTextureLoaderOptions

completionHandler - Block called when texture has been loaded and fully initialized

newTextureWithDataOptionsError

public MTLTexture newTextureWithDataOptionsError(NSData data,
                                                 NSDictionary<java.lang.String,?> options,
                                                 org.moe.natj.general.ptr.Ptr<NSError> error)

newTextureWithData:options:error:

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

Parameters:

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

options - Dictonary of MTKTextureLoaderOptions

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

Returns:

The Metal texture. nil if an error occured

newTextureWithMDLTextureOptionsCompletionHandler

public void newTextureWithMDLTextureOptionsCompletionHandler(MDLTexture texture,
                                                             NSDictionary<java.lang.String,?> options,
                                                             MTKTextureLoader.Block_newTextureWithMDLTextureOptionsCompletionHandler completionHandler)

newTextureWithMDLTexture:options:completionHandler:

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

Parameters:

texture - MDLTexture containing image data from which to create the texture

options - Dictonary of MTKTextureLoaderOptions

completionHandler - Block called when texture has been loaded and fully initialized

newTextureWithMDLTextureOptionsError

public MTLTexture newTextureWithMDLTextureOptionsError(MDLTexture texture,
                                                       NSDictionary<java.lang.String,?> options,
                                                       org.moe.natj.general.ptr.Ptr<NSError> error)

newTextureWithMDLTexture:options:error:

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

Parameters:

texture - MDLTexture containing image data from which to create the texture

options - Dictonary of MTKTextureLoaderOptions

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

Returns:

The Metal texture. nil if an error occured

newTextureWithNameScaleFactorBundleOptionsCompletionHandler

public void newTextureWithNameScaleFactorBundleOptionsCompletionHandler(java.lang.String name,
                                                                        double scaleFactor,
                                                                        NSBundle bundle,
                                                                        NSDictionary<java.lang.String,?> options,
                                                                        MTKTextureLoader.Block_newTextureWithNameScaleFactorBundleOptionsCompletionHandler completionHandler)

newTextureWithName:scaleFactor:bundle:options:completionHandler:

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

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

Parameters:

name - A texture or image asset name

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

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

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

completionHandler - Block called when texture has been loaded and fully initialized

newTextureWithNameScaleFactorBundleOptionsError

public MTLTexture newTextureWithNameScaleFactorBundleOptionsError(java.lang.String name,
                                                                  double scaleFactor,
                                                                  NSBundle bundle,
                                                                  NSDictionary<java.lang.String,?> options,
                                                                  org.moe.natj.general.ptr.Ptr<NSError> error)

newTextursWithName:scaleFactor:bundle:options:error:

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

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.

Parameters:

names - An array of texture asset names

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

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

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

Returns:

The Metal texture. nil if an error occured

newTexturesWithContentsOfURLsOptionsCompletionHandler

public void newTexturesWithContentsOfURLsOptionsCompletionHandler(NSArray<? extends NSURL> URLs,
                                                                  NSDictionary<java.lang.String,?> options,
                                                                  MTKTextureLoader.Block_newTexturesWithContentsOfURLsOptionsCompletionHandler completionHandler)

newTexturesWithContentsOfURLs:options:completionHandler:

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

Parameters:

URLs - Locations of image files from which to create the textures

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

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.

newTexturesWithContentsOfURLsOptionsError

public NSArray<?> newTexturesWithContentsOfURLsOptionsError(NSArray<? extends NSURL> URLs,
                                                            NSDictionary<java.lang.String,?> options,
                                                            org.moe.natj.general.ptr.Ptr<NSError> error)

newTexturesWithContentsOfURLs:options:completionHandler:

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

Parameters:

URLs - Locations of image files from which to create the textures

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

error - Pointer to an autoreleased NSError object which will be set if an error occurred. Will be null if all of the textures are loaded successfully, or will correspond to one of the textures which failed to load.

Returns:

An array of MTLTextures of 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 null].

newTexturesWithNamesScaleFactorBundleOptionsCompletionHandler

public void newTexturesWithNamesScaleFactorBundleOptionsCompletionHandler(NSArray<java.lang.String> names,
                                                                          double scaleFactor,
                                                                          NSBundle bundle,
                                                                          NSDictionary<java.lang.String,?> options,
                                                                          MTKTextureLoader.Block_newTexturesWithNamesScaleFactorBundleOptionsCompletionHandler completionHandler)

newTexturesWithNames:scaleFactor:bundle:options:completionHandler:

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

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.

Parameters:

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]

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

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

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

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.