Added "constant" rng.

lib/randomSupplies.js

@@ -75,7 +75,7 @@
 				var index = String.fromCharCode(r, g, b, a);
 				if (ignoredColors[index]){
 					return [r, g, b, a];
-		}
+				}
 				var baseIndex = i * 4;
 				return [
 					rng(r, baseIndex + 0),
@@ -87,6 +87,36 @@
 		}
 	};
 	
+	scope.constant = {
+		getRng: function(length, window){
+			return scope.nonPersistent.getRng(length, window);
+		},
+		getPixelRng: (function(){
+			var colors = Object.create(null);
+			return function getConstantPixelRng(length, window, ignoredColors){
+				var rng = scope.nonPersistent.getRng(1024, window);
+				
+				return function(r, g, b, a, i){
+					var index = String.fromCharCode(r, g, b, a);
+					if (ignoredColors[index]){
+						return [r, g, b, a];
+					}
+					var color = colors[index];
+					if (!color){
+						color = [
+							rng(r, 0),
+							rng(g, 0),
+							rng(b, 0),
+							rng(a, 0)
+						];
+						colors[index] = color;
+					}
+					return color;
+				};
+			};
+		}())
+	};
+	
 	scope.nonPersistent = {
 		getRng: function(length, window){
 			// Initialize the random number batch creation