[shgraph] Changed dissolve to only output alpha

hrt/shgraph/nodes/Dissolve.hx

@@ -9,18 +9,17 @@ using hxsl.Ast;
 class Dissolve extends ShaderNodeHxsl {
 
 	static var SRC = {
-		@sginput var rgba : Vec4;
 		@sginput var dissolveMap : Vec4;
 		@sginput(0.5) var progress : Float;
 		@sginput(0.5) var saturation : Float;
 		@sginput(1.0) var width : Float;
-		@sgoutput var output : Vec4;
+		@sgoutput var alpha : Float;
+
 
 		function fragment() {
 			var edge = mix(1.0 + width, -width, progress);
 			var ramp = saturate((1.0 + saturation) * (width - abs(edge - dissolveMap.r)) / width);
-			output.rgb = rgba.rgb;
-			output.a = rgba.a * ramp * dissolveMap.a;
+			alpha = ramp * dissolveMap.a;
 		}
 	};
 }