unity3d：UGUI层级设置有几种方式，最终是设置了什么
RenderQueue、SortingLayer、SortingOrder等的设置，让物体B挡在物体A前面
SortingOrder
SortingLayer
RenderQueue
最终设置了什么
渲染流水线相关
附Canvas组件反编译源码
using System;
using System.Runtime.CompilerServices;
using System.Threading;
using UnityEngine.Bindings;
using UnityEngine.Scripting;
namespace UnityEngine
{
/// Element that can be used for screen rendering.
///
[NativeHeader("Runtime/UI/Canvas.h"), NativeHeader("Runtime/UI/UIStructs.h"), NativeClass("UI::Canvas"), RequireComponent(typeof(RectTransform))]
public sealed class Canvas : Behaviour
{
public delegate void WillRenderCanvases();
public static event Canvas.WillRenderCanvases willRenderCanvases
{
add
{
Canvas.WillRenderCanvases willRenderCanvases = Canvas.willRenderCanvases;
Canvas.WillRenderCanvases willRenderCanvases2;
do
{
willRenderCanvases2 = willRenderCanvases;
willRenderCanvases = Interlocked.CompareExchange<Canvas.WillRenderCanvases>(ref Canvas.willRenderCanvases, (Canvas.WillRenderCanvases)Delegate.Combine(willRenderCanvases2, value), willRenderCanvases);
}
while (willRenderCanvases != willRenderCanvases2);
}
remove
{
Canvas.WillRenderCanvases willRenderCanvases = Canvas.willRenderCanvases;
Canvas.WillRenderCanvases willRenderCanvases2;
do
{
willRenderCanvases2 = willRenderCanvases;
willRenderCanvases = Interlocked.CompareExchange<Canvas.WillRenderCanvases>(ref Canvas.willRenderCanvases, (Canvas.WillRenderCanvases)Delegate.Remove(willRenderCanvases2, value), willRenderCanvases);
}
while (willRenderCanvases != willRenderCanvases2);
}
}
/// Is the Canvas in World or Overlay mode?
///
public extern RenderMode renderMode
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Is this the root Canvas?
///
public extern bool isRootCanvas
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
}
/// Get the render rect for the Canvas.
///
public Rect pixelRect
{
get
{
Rect result;
this.get_pixelRect_Injected(out result);
return result;
}
}
/// Used to scale the entire canvas, while still making it fit the screen. Only applies with renderMode is Screen Space.
///
public extern float scaleFactor
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// The number of pixels per unit that is considered the default.
///
public extern float referencePixelsPerUnit
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Allows for nested canvases to override pixelPerfect settings inherited from parent canvases.
///
public extern bool overridePixelPerfect
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Force elements in the canvas to be aligned with pixels. Only applies with renderMode is Screen Space.
///
public extern bool pixelPerfect
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// How far away from the camera is the Canvas generated.
///
public extern float planeDistance
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// The render order in which the canvas is being emitted to the Scene. (Read Only)
///
public extern int renderOrder
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
}
/// Override the sorting of canvas.
///
public extern bool overrideSorting
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Canvas' order within a sorting layer.
///
public extern int sortingOrder
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// For Overlay mode, display index on which the UI canvas will appear.
///
public extern int targetDisplay
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Unique ID of the Canvas' sorting layer.
///
public extern int sortingLayerID
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Cached calculated value based upon SortingLayerID.
///
public extern int cachedSortingLayerValue
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
}
/// Get or set the mask of additional shader channels to be used when creating the Canvas mesh.
///
public extern AdditionalCanvasShaderChannels additionalShaderChannels
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Name of the Canvas' sorting layer.
///
public extern string sortingLayerName
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Returns the Canvas closest to root, by checking through each parent and returning the last canvas found. If no other canvas is found then the canvas will return itself.
///
public extern Canvas rootCanvas
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
}
/// Camera used for sizing the Canvas when in Screen Space - Camera. Also used as the Camera that events will be sent through for a World Space [[Canvas].
///
[NativeProperty("Camera", false, TargetType.Function)]
public extern Camera worldCamera
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// The normalized grid size that the canvas will split the renderable area into.
///
[NativeProperty("SortingBucketNormalizedSize", false, TargetType.Function)]
public extern float normalizedSortingGridSize
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// The normalized grid size that the canvas will split the renderable area into.
///
[Obsolete("Setting normalizedSize via a int is not supported. Please use normalizedSortingGridSize", false), NativeProperty("SortingBucketNormalizedSize", false, TargetType.Function)]
public extern int sortingGridNormalizedSize
{
[MethodImpl(MethodImplOptions.InternalCall)]
get;
[MethodImpl(MethodImplOptions.InternalCall)]
set;
}
/// Returns the default material that can be used for rendering text elements on the Canvas.
///
[Obsolete("Shared default material now used for text and general UI elements, call Canvas.GetDefaultCanvasMaterial()", false), FreeFunction("UI::GetDefaultUIMaterial")]
[MethodImpl(MethodImplOptions.InternalCall)]
public static extern Material GetDefaultCanvasTextMaterial();
/// Returns the default material that can be used for rendering normal elements on the Canvas.
///
[FreeFunction("UI::GetDefaultUIMaterial")]
[MethodImpl(MethodImplOptions.InternalCall)]
public static extern Material GetDefaultCanvasMaterial();
/// Gets or generates the ETC1 Material.
///
/// The generated ETC1 Material from the Canvas.
///
[FreeFunction("UI::GetETC1SupportedCanvasMaterial")]
[MethodImpl(MethodImplOptions.InternalCall)]
public static extern Material GetETC1SupportedCanvasMaterial();
/// Force all canvases to update their content.
///
public static void ForceUpdateCanvases()
{
Canvas.SendWillRenderCanvases();
}
[RequiredByNativeCode]
private static void SendWillRenderCanvases()
{
if (Canvas.willRenderCanvases != null)
{
Canvas.willRenderCanvases();
}
}
[MethodImpl(MethodImplOptions.InternalCall)]
private extern void get_pixelRect_Injected(out Rect ret);
}
}