An advanced double-pass rendering class that utilizes a z-culling on an opaque objects.
For optimization to work properly, all opaque objects should have Object.blendMode set to None.
Rendering is done in two passes:
An opaque pass only renders objects with blendeMode = None, with RenderContext.front2back and RenderContext.killAlpha enabled.
Transparent pass renders the rest of the objects (which are not marked as opaque) as usual.
That allows to perform a z-cull depth test on the objects and reduce the overall GPU strain.
Additionally, ZGroup places a limitation on filter usage. They are not drawn in opaque pass, which can lead to undefined behavior.
Constructor
new(?parent:Object)
Create a new ZGroup instance/
Parameters:
parent | An optional parent |
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Inherited Variables
Defined by Object
private@:dox(show)allocated:Bool
A flag that indicates whether the object was allocated or not.
When adding children to allocated objects, onAdd is being called immediately,
otherwise it's delayed until the whole tree is added to a currently active Scene.
@:value(Alpha)blendMode:BlendMode = Alpha
The blending mode of the object.
If there is no Object.filter active, only applies to the current object (not inherited by children).
Otherwise tells how the filter is blended with background.
filter:Filter
The post process filter for this object.
When set, Object.alpha value affects both filter and object transparency (use Drawable.color.a to set transparency only for the object).
name:String
The name of the object. Can be used to retrieve an object within a tree by using Object.getObjectByName.
private@:dox(show)parentContainer:Object
The parent container of this object.
See Object.contentChanged for more details.
private@:dox(show)posChanged:Bool
A flag that indicates that the object transform was modified and absolute position recalculation is required.
Automatically cleared on Object.sync and can be manually synced with the Object.syncPos.
Inherited Methods
Defined by Layers
@:value({ index : -1, layer : -1 })add(s:Object, layer:Int = -1, index:Int = -1):Void
Adds a child object s at the end of the given layer.
Parameters:
s | An object to be added. |
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layer | An index of the layer the object should be added at with 0 being the bottom-most layer. Pass -1 to use topmost layer. |
index | An optional index at which the object should be inserted inside the layer. Pass -1 to append to the end. |
@:dox(show)addChild(s:Object):Void
Adds a child object s at the end of the topmost layer.
Parameters:
s | An object to be added. |
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@:dox(show)addChildAt(s:Object, index:Int):Void
Adds a child object s at specified index on the top topmost layer.
Warning: Previous behavior of Layers.addChildAt is no longer applicable and Layers.add should be used instead.
Parameters:
s | The object to be added. |
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index | The position of the object in the layer. |
getChildAtLayer(n:Int, layer:Int):Object
Return the nth element among the immediate children list on the layer, or null if there is none.
Parameters:
layer | The layer children of which are used. Pass -1 to use the topmost layer. |
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getChildIndexInLayer(o:Object):Int
Return the index of the child within its respective layer.
Parameters:
o | The child to look up index of. |
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Returns:
-1 if object is not a child of Layers, index of the child within its current layer otherwise.
getChildLayer(s:Object):Int
Returns the layer on which the child s resides on.
Parameters:
s | An object to look up to. |
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Returns:
An index of the layer where the object resides on or -1 if s is not a child of the Layers.
getLayer(layer:Int):Iterator<Object>
Returns an Iterator with objects in a specified layer.
Returns an empty iterator if no objects are present in the layer.
Objects added or removed from Layers during iteration do not affect the output of the Iterator.
Parameters:
layer | A layer index to iterate over. |
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over(s:Object):Void
Moves an object s to the top of its layer (rendered last, in front of other Objects in layer).
Causes Object.onHierarchyMoved on the Object.
Parameters:
s | An object to be moved. |
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under(s:Object):Void
Moves an object s to the bottom of its layer (rendered first, behind the other Objects in the layer).
Causes Object.onHierarchyMoved on the Object.
Parameters:
s | An object to be moved. |
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ysort(layer:Int):Void
Sorts specified layer based on Object.y value of it's children.
Causes Object.onHierarchyChanged on moved children.
Parameters:
layer | An index of the layer to sort. |
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Defined by Object
private@:dox(show)addBounds(relativeTo:Object, out:Bounds, dx:Float, dy:Float, width:Float, height:Float):Void
Adds specified area in local coordinate space to the bounds. Expected to be used within Object.getBoundsRec.
Parameters:
relativeTo | An object relative to which the Object bounds coordinates should be. If not set, coordinates are in absolute coordinate space. |
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out | An output Bounds instance. |
dx | The top-left X offset of the added bounds rectangle. |
dy | The top-left Y offset of the added bounds rectangle. |
width | The width of the added bounds rectangle. |
height | The height of the added bounds rectangle. |
private@:dox(show)calcAbsPos():Void
private@:value({ scaleY : 1., scaleX : 1. })@:dox(show)clipBounds(ctx:RenderContext, bounds:Bounds, scaleX:Float = 1., scaleY:Float = 1.):Void
h2d.Scene note: clipBounds will always output bounds equivalent to entire window.
This is done in order for scene to never clip out cameras as they may render virtually any area of the Scene.
private@:dox(show)constraintSize(maxWidth:Float, maxHeight:Float):Void
For example, Text constraints it's maximum width, causing word-wrap to occur within constrained area.
See also:
private@:dox(show)contentChanged(s:Object):Void
private@:dox(show)draw(ctx:RenderContext):Void
Override this method in order to add custom graphics rendering to your Object.
draw is invoked before rendering of the object children.
drawToTextures(texs:Array<Texture>, outputs:Array<Output>):Void
Draw the object and all its children into the given Textures.
private@:dox(show)emitTile(ctx:RenderContext, tile:Tile):Void
Draws single Tile instance with this Object transform.
find<T>(f:Object ‑> Null<T>):Null<T>
Find a single object in the tree by calling f on each and returning the first not-null value returned, or null if not found.
findAll<T>(f:Object ‑> Null<T>, ?arr:Array<T>):Array<T>
Find several objects in the tree by calling f on each and returning all the not-null values returned.
Parameters:
arr | An optional array instance to fill results with. Allocates a new array if not set. |
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inlinegetAbsPos():Matrix
Returns the updated absolute position matrix. See Object.getMatrix for current matrix values.
getBounds(?relativeTo:Object, ?out:Bounds):Bounds
Return the bounds of the object for its whole content, recursively.
Parameters:
relativeTo | An optional object relative to coordinates of which bounds are returned. Returns bounds in the absolute coordinates if not set. |
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out | An optional bounds instance to fill. Allocates new Bounds instance and returns it if not set. |
private@:dox(show)getBoundsRec(relativeTo:Object, out:Bounds, forSize:Bool):Void
Override this method in order to expand the reported bounds of an object. Object.addBounds can be used to add bounds with respect to relativeTo.
Do not remove the super call.
Parameters:
relativeTo | An object relative to which the Object bounds coordinates should be. |
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out | An output Bounds instance. |
forSize | Whether it's being called for |
getChildAt(n:Int):Object
Return the nth element among the immediate children list of this object, or null if there is no Object at this position.
getChildIndex(o:Object):Int
Return the index of the object o within the immediate children list of this object, or -1 if it is not part of the children list.
private@:dox(show)getMatrix(m:Matrix):Void
Populates m with current absolute object transform values. See Object.getAbsPos for up-to-date values.
getObjectByName(name:String):Object
Search for an object recursively by name, return null if not found.
getScene():Scene
Returns an h2d.Scene down the hierarchy tree or null if object is not added to Scene.
finalgetSize(?out:Bounds):Bounds
Similar to getBounds(parent), but instead of the full content, it will return
the size based on the alignment of the object. For instance for a text, Object.getBounds will return
the full glyphs size whereas getSize will ignore the pixels under the baseline.
Parameters:
out | An optional bounds instance to fill. Allocates new Bounds instance and returns it if not set. |
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globalToLocal(pt:Point):Point
Convert an absolute screen position into a local position relative to the object origin, applying all the inherited transforms.
Parameters:
pt | A position to convert and return. Modifies the Point instance as is. |
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localToGlobal(?pt:Point):Point
Convert a local position (or [0,0] if pt is null) relative to the object origin into an absolute screen position, applying all the inherited transforms.
Parameters:
pt | An optional position to convert and return. Allocates new Point at 0,0 position if not set. Modifies the Point instance as is. |
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move(dx:Float, dy:Float):Void
Move the object by the specified amount along its current direction (Object.rotation angle).
private@:dox(show)onAdd():Void
Sent when object is being added to an allocated scene.
Do not remove the super call when overriding.
private@:dox(show)inlineonContentChanged():Void
Should be called when Object content was changed in order to notify parent container. See Object.contentChanged.
private@:dox(show)onHierarchyMoved(parentChanged:Bool):Void
Sent when object was already allocated and moved within scene object tree hierarchy.
Do not remove the super call when overriding.
Parameters:
parentChanged | Whether Object was moved withing same parent (through |
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private@:dox(show)onRemove():Void
Sent when object is removed from the allocated scene.
Do not remove the super call when overriding.
private@:dox(show)setParentContainer(c:Object):Void
Sets the parent container for this Object and it's children.
See Object.contentChanged for more details.
private@:dox(show)sync(ctx:RenderContext):Void
Performs a sync of data for rendering (such as absolute position recalculation). While this method can be used as a substitute to an update loop, it's primary purpose it to prepare the Object to be rendered.
Do not remove the super call when overriding.