diff --git a/src/Shader/PixelRoutine.cpp b/src/Shader/PixelRoutine.cpp
index 2025da7..7e6c943 100644
--- a/src/Shader/PixelRoutine.cpp
+++ b/src/Shader/PixelRoutine.cpp
@@ -868,7 +868,7 @@
 		}
 	}
 
-	void PixelRoutine::blendFactor(const Vector4s &blendFactor, const Vector4s &current, const Vector4s &pixel, BlendFactor blendFactorActive)
+	void PixelRoutine::blendFactor(Vector4s &blendFactor, const Vector4s &current, const Vector4s &pixel, BlendFactor blendFactorActive)
 	{
 		switch(blendFactorActive)
 		{
@@ -949,7 +949,7 @@
 		}
 	}
 
-	void PixelRoutine::blendFactorAlpha(const Vector4s &blendFactor, const Vector4s &current, const Vector4s &pixel, BlendFactor blendFactorAlphaActive)
+	void PixelRoutine::blendFactorAlpha(Vector4s &blendFactor, const Vector4s &current, const Vector4s &pixel, BlendFactor blendFactorAlphaActive)
 	{
 		switch(blendFactorAlphaActive)
 		{
@@ -1899,7 +1899,7 @@
 		}
 	}
 
-	void PixelRoutine::blendFactor(const Vector4f &blendFactor, const Vector4f &oC, const Vector4f &pixel, BlendFactor blendFactorActive)
+	void PixelRoutine::blendFactor(Vector4f &blendFactor, const Vector4f &oC, const Vector4f &pixel, BlendFactor blendFactorActive)
 	{
 		switch(blendFactorActive)
 		{
@@ -1970,7 +1970,7 @@
 		}
 	}
 
-	void PixelRoutine::blendFactorAlpha(const Vector4f &blendFactor, const Vector4f &oC, const Vector4f &pixel, BlendFactor blendFactorAlphaActive)
+	void PixelRoutine::blendFactorAlpha(Vector4f &blendFactor, const Vector4f &oC, const Vector4f &pixel, BlendFactor blendFactorAlphaActive)
 	{
 		switch(blendFactorAlphaActive)
 		{
diff --git a/src/Shader/PixelRoutine.hpp b/src/Shader/PixelRoutine.hpp
index ba692c3..d57f2cb 100644
--- a/src/Shader/PixelRoutine.hpp
+++ b/src/Shader/PixelRoutine.hpp
@@ -76,11 +76,11 @@
 		Bool depthTest(Pointer<Byte> &zBuffer, int q, Int &x, Float4 &z, Int &sMask, Int &zMask, Int &cMask);
 
 		// Raster operations
-		void blendFactor(const Vector4s &blendFactor, const Vector4s &current, const Vector4s &pixel, BlendFactor blendFactorActive);
-		void blendFactorAlpha(const Vector4s &blendFactor, const Vector4s &current, const Vector4s &pixel, BlendFactor blendFactorAlphaActive);
+		void blendFactor(Vector4s &blendFactor, const Vector4s &current, const Vector4s &pixel, BlendFactor blendFactorActive);
+		void blendFactorAlpha(Vector4s &blendFactor, const Vector4s &current, const Vector4s &pixel, BlendFactor blendFactorAlphaActive);
 		void readPixel(int index, Pointer<Byte> &cBuffer, Int &x, Vector4s &pixel);
-		void blendFactor(const Vector4f &blendFactor, const Vector4f &oC, const Vector4f &pixel, BlendFactor blendFactorActive);
-		void blendFactorAlpha(const Vector4f &blendFactor, const Vector4f &oC, const Vector4f &pixel, BlendFactor blendFactorAlphaActive);
+		void blendFactor(Vector4f &blendFactor, const Vector4f &oC, const Vector4f &pixel, BlendFactor blendFactorActive);
+		void blendFactorAlpha(Vector4f &blendFactor, const Vector4f &oC, const Vector4f &pixel, BlendFactor blendFactorAlphaActive);
 		void writeStencil(Pointer<Byte> &sBuffer, int q, Int &x, Int &sMask, Int &zMask, Int &cMask);
 		void writeDepth(Pointer<Byte> &zBuffer, int q, Int &x, Float4 &z, Int &zMask);
 
diff --git a/src/Shader/SetupRoutine.cpp b/src/Shader/SetupRoutine.cpp
index 1845047..c31bbec 100644
--- a/src/Shader/SetupRoutine.cpp
+++ b/src/Shader/SetupRoutine.cpp
@@ -555,25 +555,23 @@
 		}
 	}
 
-	void SetupRoutine::edge(Pointer<Byte> &primitive, Pointer<Byte> &data, const Int &X1, const Int &Y1, const Int &X2, const Int &Y2, Int &q)
+	void SetupRoutine::edge(Pointer<Byte> &primitive, Pointer<Byte> &data, const Int &Xa, const Int &Ya, const Int &Xb, const Int &Yb, Int &q)
 	{
-		If(Y1 != Y2)
+		If(Ya != Yb)
 		{
 			Int xMin = *Pointer<Int>(data + OFFSET(DrawData,scissorX0));
 			Int xMax = *Pointer<Int>(data + OFFSET(DrawData,scissorX1));
 
-			Bool swap = Y2 < Y1;
+			Bool swap = Yb < Ya;
 
 			Pointer<Byte> leftEdge = primitive + q * sizeof(Primitive) + OFFSET(Primitive,outline->left);
 			Pointer<Byte> rightEdge = primitive + q * sizeof(Primitive) + OFFSET(Primitive,outline->right);
 			Pointer<Byte> edge = IfThenElse(swap, rightEdge, leftEdge);
 
-			Int X0 = X1;
-			Int Y0 = Y1;
-			X1 = IfThenElse(swap, X2, X1);
-			X2 = IfThenElse(swap, X0, X2);
-			Y1 = IfThenElse(swap, Y2, Y1);
-			Y2 = IfThenElse(swap, Y0, Y2);
+			Int X1 = IfThenElse(swap, Xb, Xa);
+			Int X2 = IfThenElse(swap, Xa, Xb);
+			Int Y1 = IfThenElse(swap, Yb, Ya);
+			Int Y2 = IfThenElse(swap, Ya, Yb);
 
 			Int y1 = Max((Y1 + 0x0000000F) >> 4, *Pointer<Int>(data + OFFSET(DrawData,scissorY0)));
 			Int y2 = Min((Y2 + 0x0000000F) >> 4, *Pointer<Int>(data + OFFSET(DrawData,scissorY1)));
diff --git a/src/Shader/SetupRoutine.hpp b/src/Shader/SetupRoutine.hpp
index ac31299..ebcc080 100644
--- a/src/Shader/SetupRoutine.hpp
+++ b/src/Shader/SetupRoutine.hpp
@@ -34,7 +34,7 @@
 
 	private:
 		void setupGradient(Pointer<Byte> &primitive, Pointer<Byte> &triangle, Float4 &w012, Float4 (&m)[3], Pointer<Byte> &v0, Pointer<Byte> &v1, Pointer<Byte> &v2, int attribute, int planeEquation, bool flatShading, bool sprite, bool perspective, bool wrap, int component);
-		void edge(Pointer<Byte> &primitive, Pointer<Byte> &data, const Int &X1, const Int &Y1, const Int &X2, const Int &Y2, Int &q);
+		void edge(Pointer<Byte> &primitive, Pointer<Byte> &data, const Int &Xa, const Int &Ya, const Int &Xb, const Int &Yb, Int &q);
 		void conditionalRotate1(Bool condition, Pointer<Byte> &v0, Pointer<Byte> &v1, Pointer<Byte> &v2);
 		void conditionalRotate2(Bool condition, Pointer<Byte> &v0, Pointer<Byte> &v1, Pointer<Byte> &v2);
 
diff --git a/src/Shader/VertexRoutine.hpp b/src/Shader/VertexRoutine.hpp
index 4aec45f..dd4bf13 100644
--- a/src/Shader/VertexRoutine.hpp
+++ b/src/Shader/VertexRoutine.hpp
@@ -29,10 +29,10 @@
 		virtual ~VertexRoutinePrototype() {};
 
 	protected:
-		const Pointer<Byte> vertex;
-		const Pointer<Byte> batch;
-		const Pointer<Byte> task;
-		const Pointer<Byte> data;
+		Pointer<Byte> vertex;
+		Pointer<Byte> batch;
+		Pointer<Byte> task;
+		Pointer<Byte> data;
 	};
 
 	class VertexRoutine : public VertexRoutinePrototype