2 files changed, 12 insertions, 0 deletions
diff --git a/src/math/color.cc b/src/math/color.cc
index 1e52ec5..0cf2ea8 100644
--- a/src/math/color.cc
+++ b/src/math/color.cc
@@ -123,6 +123,15 @@ Color const operator*(float scalar, Color const & color)
 {
 	return color * scalar;
 }
+
+Color & Color::operator*=(const float scalar)
+{
+	for (int i=0; i < 3; i++)
+		rgba_data[i] *= scalar;
+	return (*this);
+}
+
+
 std::ostream &operator<<(std::ostream &os, Color const & color)
 {
 	os <<  color.red() << " " << color.green() << " " << color.blue(); // << " " << c.alpha();
diff --git a/src/math/color.h b/src/math/color.h
index ea6fe1c..4f3df16 100644
--- a/src/math/color.h
+++ b/src/math/color.h
@@ -46,6 +46,9 @@ public:
 	/// multiply rgb values with scalar value.
 	Color operator*(const float scalar) const;
 
+	/// multiply rgb values with scalar value.
+	Color & operator*=(const float scalar);
+
 	inline float operator[](size_t index) const { return rgba_data[index]; }
 
 	/// pointer to the internal data