Fix flxstrip color-not reset causing not rendering for batches sharing the same shader. (#3220)

Author: davidetan

flixel/graphics/tile/FlxDrawTrianglesItem.hx

@@ -70,6 +70,11 @@ class FlxDrawTrianglesItem extends FlxDrawBaseItem<FlxDrawTrianglesItem>
 			shader.colorMultiplier.value = colorMultipliers;
 			shader.colorOffset.value = colorOffsets;
 		}
+		else
+		{
+			shader.colorMultiplier.value = null;
+			shader.colorOffset.value = null;
+		}
 
 		setParameterValue(shader.hasTransform, true);
 		setParameterValue(shader.hasColorTransform, colored || hasColorOffsets);
@@ -175,6 +180,7 @@ class FlxDrawTrianglesItem extends FlxDrawBaseItem<FlxDrawTrianglesItem>
 			i += 2;
 		}
 
+		var indicesLength:Int = indices.length;
 		if (!cameraBounds.overlaps(bounds))
 		{
 			this.vertices.splice(this.vertices.length - verticesLength, verticesLength);
@@ -187,7 +193,6 @@ class FlxDrawTrianglesItem extends FlxDrawBaseItem<FlxDrawTrianglesItem>
 				this.uvtData[prevUVTDataLength + i] = uvtData[i];
 			}
 
-			var indicesLength:Int = indices.length;
 			for (i in 0...indicesLength)
 			{
 				this.indices[prevIndicesLength + i] = indices[i] + prevNumberOfVertices;
@@ -211,11 +216,9 @@ class FlxDrawTrianglesItem extends FlxDrawBaseItem<FlxDrawTrianglesItem>
 		cameraBounds.putWeak();
 
 		#if !flash
-		for (_ in 0...numTriangles)
+		for (_ in 0...indicesLength)
 		{
 			alphas.push(transform != null ? transform.alphaMultiplier : 1.0);
-			alphas.push(transform != null ? transform.alphaMultiplier : 1.0);
-			alphas.push(transform != null ? transform.alphaMultiplier : 1.0);
 		}
 
 		if (colored || hasColorOffsets)
@@ -226,7 +229,7 @@ class FlxDrawTrianglesItem extends FlxDrawBaseItem<FlxDrawTrianglesItem>
 			if (colorOffsets == null)
 				colorOffsets = [];
 
-			for (_ in 0...(numTriangles * 3))
+			for (_ in 0...indicesLength)
 			{
 				if(transform != null)
 				{