Fix aliasing bug. Fixes issue 139.

ChangeLog

@@ -7,6 +7,7 @@ NVIDIA Texture Tools version 2.0.9
  * Fix single color DXT1a compressor. Fixes issue 134.
  * Fix mirror sampling. Fixes issue 135.
  * Fix seek bug. Fixes issue 144.
+ * Fix aliasing bug. Fixes issue 139.
 
 NVIDIA Texture Tools version 2.0.8
  * Fix float to fixed image conversion. Patch provided by Alex Pfaffe. Fixes issue 121.

src/nvmath/Vector.h

@@ -68,7 +68,7 @@ public:
 	scalar y() const;
 	scalar z() const;
 
-	const Vector2 & xy() const;
+	Vector2 xy() const;
 
 	scalar component(uint idx) const;
 
@@ -111,8 +111,8 @@ public:
 	scalar z() const;
 	scalar w() const;
 	
-	const Vector2 & xy() const;
-	const Vector3 & xyz() const;
+	Vector2 xy() const;
+	Vector3 xyz() const;
 
 	scalar component(uint idx) const;
 
@@ -231,9 +231,9 @@ inline scalar Vector3::x() const { return m_x; }
 inline scalar Vector3::y() const { return m_y; }
 inline scalar Vector3::z() const { return m_z; }
 	
-inline const Vector2 & Vector3::xy() const
+inline Vector2 Vector3::xy() const
 {
-	return *(Vector2 *)this;
+	return Vector2(x(), y());
 }
 
 inline scalar Vector3::component(uint idx) const
@@ -332,14 +332,14 @@ inline scalar Vector4::y() const { return m_y; }
 inline scalar Vector4::z() const { return m_z; }
 inline scalar Vector4::w() const { return m_w; }
 
-inline const Vector2 & Vector4::xy() const
+inline Vector2 Vector4::xy() const
 {
-	return *(Vector2 *)this;
+	return Vector2(x(), y());
 }
 
-inline const Vector3 & Vector4::xyz() const
+inline Vector3 Vector4::xyz() const
 {
-	return *(Vector3 *)this;
+	return Vector3(x(), y(), z());
 }
 
 inline scalar Vector4::component(uint idx) const