適用於 Adobe® Flash® Platform 的 ActionScript® 3.0 參考
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運算子
陳述式、關鍵字和指令
特殊類型

附錄

新增內容
編譯器錯誤
編譯器警告
執行階段錯誤
移轉至 ActionScript 3
支援的字元集
僅限 MXML 標籤
移動 XML 元素
Timed Text 標籤
不建議元素清單
AccessibilityImplementation 常數
如何使用 ActionScript 範例
法律聲明
套件flash.display
類別public final dynamic class ShaderParameter
繼承ShaderParameter Inheritance Object

語言版本: ActionScript 3.0
執行階段版本: Flash Player 10, AIR 1.5

ShaderParameter 實體代表著色器核心的單一輸入參數。核心可以定義為接受 0、1,或是更多個用於核心執行作業的參數。ShaderParameter 會提供參數的相關資訊,例如參數預期的資料類型。它同時提供用於設定參數值 (在著色器執行時可以使用) 的機制。若要指定著色器參數的值,建立包含這些值的 Array 並將其指派給 value 屬性。

代表 Shader 實體參數的 ShaderParameter 實體可以當作 Shader 實體之 data 屬性來存取。ShaderParameter 屬性的名稱與著色器程式碼中的參數名稱一樣。例如,如果著色器定義了名為 radius 的參數,則會將代表 radius 參數的 ShaderParameter 實體當成 radius 屬性來提供,如以下範例所示:

var radiusParam:ShaderParameter = myShader.data.radius;

除了 ShaderParameter 類別的定義屬性之外,每個 ShaderParameter 實體還包含其他屬性 (對應至針對參數定義的任何中繼資料)。這些屬性都會在建立時新增到 ShaderParameter 物件。屬性的名稱符合著色器原始碼中指定的中繼資料名稱。每個屬性的資料類型會依據對應的中繼資料之資料類型而有所不同。例如「description」之類的文字中繼資料是一個 String 實體。內含非字串值 (例如 minValuedefaultValue) 的中繼資料屬性會以 Array 實體來代表。元素的數目與元素資料類型會對應至中繼資料值。

例如,假設著色器內含下列兩個參數宣告:

     parameter float2 size
     <
         description: "The size of the image to which the kernel is applied";
         minValue: float2(0.0, 0.0);
         maxValue: float2(100.0, 100.0);
         defaultValue: float2(50.0, 50.0);
     >;
     
     parameter float radius
     <
         description: "The radius of the effect";
         minValue: 0.0;
         maxValue: 50.0;
         defaultValue: 25.0;
     >;
     

對應至 size 參數的 ShaderParameter 實體除了自身內建的屬性之外,還有下列中繼資料屬性:

屬性名稱資料類型
name 字串 "size"
描述 字串 "The size of the image to which the kernel is applied"
minValue Array [0, 0]
maxValue Array [100, 100]
defaultValue Array [50, 50]

對應至 radius 參數的 ShaderParameter 內含下列額外的屬性:

屬性名稱資料類型
name 字串 "radius"
描述 字串 "The radius of the effect"
minValue Array [0]
maxValue Array [50]
defaultValue Array [25]

一般而言,開發人員程式碼不會直接建立 ShaderParameter 實體。ShaderParameter 實體會在建立 Shader 實體時針對每一個著色器的參數建立。

相關 API 元素



公用屬性
 屬性定義自
 Inheritedconstructor : Object
類別物件的參照或是特定物件實體的建構函數。
Object
  index : int
[唯讀] 以零為基底的參數索引。
ShaderParameter
  type : String
[唯讀] 著色器中定義的參數資料類型。
ShaderParameter
  value : Array
當成參數值傳入著色器的值。
ShaderParameter
公用方法
 方法定義自
  
建立 ShaderParameter 實體。
ShaderParameter
 Inherited
指出物件是否有已定義的指定屬性。
Object
 Inherited
指出 Object 類別的實體是否位於指定為參數的物件原型鏈中。
Object
 Inherited
指出指定的屬性是否存在,以及是否可列舉。
Object
 Inherited
為迴圈作業設定動態屬性的可用性。
Object
 Inherited
傳回代表此物件的字串,根據地區特定慣例進行格式化。
Object
 Inherited
會傳回指定之物件的字串形式。
Object
 Inherited
會傳回指定之物件的基本值。
Object
屬性詳細資訊

index

屬性
index:int  [唯讀]

語言版本: ActionScript 3.0
執行階段版本: Flash Player 10, AIR 1.5

以零為基底的參數索引。



實作
    public function get index():int

type

屬性 
type:String  [唯讀]

語言版本: ActionScript 3.0
執行階段版本: Flash Player 10, AIR 1.5

著色器中定義的參數資料類型。type 屬性的可能值集合是由 ShaderParameterType 類別中的常數所定義。



實作
    public function get type():String

相關 API 元素

value

屬性 
value:Array

語言版本: ActionScript 3.0
執行階段版本: Flash Player 10, AIR 1.5

當成參數值傳入著色器的值。value 屬性是一個索引的 Array。Array 的數目與元素類型對應至參數的資料類型,後者可透過 type 屬性來決定。

下表指出參數類型、對應的數目,以及 value 陣列之元素的資料類型:

參數類型元素數目元素資料類型
float (ShaderParameterType.FLOAT)1Number
float2 (ShaderParameterType.FLOAT2)2Number
float3 (ShaderParameterType.FLOAT3)3Number
float4 (ShaderParameterType.FLOAT4)4Number
int (ShaderParameterType.INT)1int 或 uint
int2 (ShaderParameterType.INT2)2int 或 uint
int3 (ShaderParameterType.INT3)3int 或 uint
int4 (ShaderParameterType.INT4)4int 或 uint
bool (ShaderParameterType.BOOL)1Boolean
bool2 (ShaderParameterType.BOOL2)2Boolean
bool3 (ShaderParameterType.BOOL3)3Boolean
bool4 (ShaderParameterType.BOOL4)4Boolean
float2x2 (ShaderParameterType.MATRIX2X2)4Number
float3x3 (ShaderParameterType.MATRIX3X3)9Number
float4x4 (ShaderParameterType.MATRIX4X4)16Number

如果是矩陣參數類型,則陣列元素會填入矩陣的列中,然後才是欄。例如,假設使用下列 ActionScript 程式碼行填入名為 myMatrixfloat2x2 參數:

myShader.data.myMatrix.value = [.1, .2, .3, .4];

在著色器中,矩陣元素具有下列各值:

  • myMatrix[0][0]: .1
  • myMatrix[0][1]: .2
  • myMatrix[1][0]: .3
  • myMatrix[1][1]: .4



實作
    public function get value():Array
    public function set value(value:Array):void
建構函式詳細資料

ShaderParameter

()建構函式
public function ShaderParameter()

語言版本: ActionScript 3.0
執行階段版本: Flash Player 10, AIR 1.5

建立 ShaderParameter 實體。開發人員程式碼不會直接呼叫 ShaderParameter 建構函式。ShaderParameter 實體會在建立 Shader 實體時針對每一個著色器的參數建立。





[ X ]為什麼顯示英文?
「ActionScript 3.0 參考」的內容是以英文顯示

並非所有「ActionScript 3.0 參考」的內容都翻譯為所有語言。當語言元素未翻譯時,就會以英文顯示。例如,ga.controls.HelpBox 類別並沒有翻譯為任何語言。因此在參考的繁體中文版本中,ga.controls.HelpBox 類別就會以英文顯示。