text: /// @ref gtx_transform2
  
  namespace glm
  {
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<3, 3, T, Q> shearX2D(mat<3, 3, T, Q> const& m, T s)
  	{
  		mat<3, 3, T, Q> r(1);
  		r[1][0] = s;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<3, 3, T, Q> shearY2D(mat<3, 3, T, Q> const& m, T s)
  	{
  		mat<3, 3, T, Q> r(1);
  		r[0][1] = s;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<4, 4, T, Q> shearX3D(mat<4, 4, T, Q> const& m, T s, T t)
  	{
  		mat<4, 4, T, Q> r(1);
  		r[0][1] = s;
  		r[0][2] = t;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<4, 4, T, Q> shearY3D(mat<4, 4, T, Q> const& m, T s, T t)
  	{
  		mat<4, 4, T, Q> r(1);
  		r[1][0] = s;
  		r[1][2] = t;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<4, 4, T, Q> shearZ3D(mat<4, 4, T, Q> const& m, T s, T t)
  	{
  		mat<4, 4, T, Q> r(1);
  		r[2][0] = s;
  		r[2][1] = t;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<3, 3, T, Q> reflect2D(mat<3, 3, T, Q> const& m, vec<3, T, Q> const& normal)
  	{
  		mat<3, 3, T, Q> r(static_cast<T>(1));
  		r[0][0] = static_cast<T>(1) - static_cast<T>(2) * normal.x * normal.x;
  		r[0][1] = -static_cast<T>(2) * normal.x * normal.y;
  		r[1][0] = -static_cast<T>(2) * normal.x * normal.y;
  		r[1][1] = static_cast<T>(1) - static_cast<T>(2) * normal.y * normal.y;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<4, 4, T, Q> reflect3D(mat<4, 4, T, Q> const& m, vec<3, T, Q> const& normal)
  	{
  		mat<4, 4, T, Q> r(static_cast<T>(1));
  		r[0][0] = static_cast<T>(1) - static_cast<T>(2) * normal.x * normal.x;
  		r[0][1] = -static_cast<T>(2) * normal.x * normal.y;
  		r[0][2] = -static_cast<T>(2) * normal.x * normal.z;
  
  		r[1][0] = -static_cast<T>(2) * normal.x * normal.y;
  		r[1][1] = static_cast<T>(1) - static_cast<T>(2) * normal.y * normal.y;
  		r[1][2] = -static_cast<T>(2) * normal.y * normal.z;
  
  		r[2][0] = -static_cast<T>(2) * normal.x * normal.z;
  		r[2][1] = -static_cast<T>(2) * normal.y * normal.z;
  		r[2][2] = static_cast<T>(1) - static_cast<T>(2) * normal.z * normal.z;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<3, 3, T, Q> proj2D(const mat<3, 3, T, Q>& m, const vec<3, T, Q>& normal)
  	{
  		mat<3, 3, T, Q> r(static_cast<T>(1));
  		r[0][0] = static_cast<T>(1) - normal.x * normal.x;
  		r[0][1] = - normal.x * normal.y;
  		r[1][0] = - normal.x * normal.y;
  		r[1][1] = static_cast<T>(1) - normal.y * normal.y;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<4, 4, T, Q> proj3D(const mat<4, 4, T, Q>& m, const vec<3, T, Q>& normal)
  	{
  		mat<4, 4, T, Q> r(static_cast<T>(1));
  		r[0][0] = static_cast<T>(1) - normal.x * normal.x;
  		r[0][1] = - normal.x * normal.y;
  		r[0][2] = - normal.x * normal.z;
  		r[1][0] = - normal.x * normal.y;
  		r[1][1] = static_cast<T>(1) - normal.y * normal.y;
  		r[1][2] = - normal.y * normal.z;
  		r[2][0] = - normal.x * normal.z;
  		r[2][1] = - normal.y * normal.z;
  		r[2][2] = static_cast<T>(1) - normal.z * normal.z;
  		return m * r;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<4, 4, T, Q> scaleBias(T scale, T bias)
  	{
  		mat<4, 4, T, Q> result;
  		result[3]    = vec<4, T, Q>(vec<3, T, Q>(bias), static_cast<T>(1));
  		result[0][0] = scale;
  		result[1][1] = scale;
  		result[2][2] = scale;
  		return result;
  	}
  
  	template <typename T, qualifier Q>
  	GLM_FUNC_QUALIFIER mat<4, 4, T, Q> scaleBias(mat<4, 4, T, Q> const& m, T scale, T bias)
  	{
  		return m * scaleBias<T, Q>(scale, bias);
  	}
  }//namespace glm
  