diff --git a/src/etc-internal.h b/src/etc-internal.h
index c9bd520..9bab3a8 100644
--- a/src/etc-internal.h
+++ b/src/etc-internal.h
@@ -61,7 +61,7 @@ struct Vec4
 		return (x == other.x && y == other.y && z == other.z && w == other.w);
 	}
 
-	bool xyzHasEffect() const
+	bool xyzNotNull() const
 	{
 		return (x != 0.0 || y != 0.0 || z != 0.0);
 	}
diff --git a/src/graphics.cpp b/src/graphics.cpp
index 5730cfb..74e97a3 100644
--- a/src/graphics.cpp
+++ b/src/graphics.cpp
@@ -174,7 +174,7 @@ public:
 		const IntRect &viewpRect = glState.scissorBox.get();
 		const IntRect &screenRect = geometry.rect;
 
-		const bool toneRGBEffect  = t.xyzHasEffect();
+		const bool toneRGBEffect  = t.xyzNotNull();
 		const bool toneGrayEffect = t.w != 0;
 		const bool colorEffect    = c.w > 0;
 		const bool flashEffect    = f.w > 0;
@@ -240,7 +240,7 @@ public:
 			/* Then apply them using hardware blending */
 			gl.BlendFuncSeparate(GL_ONE, GL_ONE, GL_ZERO, GL_ONE);
 
-			if (add.xyzHasEffect())
+			if (add.xyzNotNull())
 			{
 				gl.BlendEquation(GL_FUNC_ADD);
 				shader.setColor(add);
@@ -248,7 +248,7 @@ public:
 				screenQuad.draw();
 			}
 
-			if (sub.xyzHasEffect())
+			if (sub.xyzNotNull())
 			{
 				gl.BlendEquation(GL_FUNC_REVERSE_SUBTRACT);
 				shader.setColor(sub);