more cleanup of the Tranform component

include/fggl/math/types.hpp

@@ -53,6 +53,10 @@ namespace fggl::math {
 	constexpr static const math::mat4 IDENTITY_M4 {1.0F};
 	constexpr static const math::quat IDENTITY_Q {1.0F, 0.0, 0.0, 0.0};
 
+	constexpr static const math::vec3 AXIS_X { 1.0F, 0.0F, 0.0F };
+	constexpr static const math::vec3 AXIS_Y { 0.0F, 1.0F, 0.0F };
+	constexpr static const math::vec3 AXIS_Z { 0.0F, 0.0F, 1.0F };
+
 	// fastFloor from OpenSimplex2
 	inline int fastFloor(double x) {
 		int xi = (int) x;
@@ -160,10 +164,11 @@ namespace fggl::math {
 				return m_euler;
 			}
 
-			inline mat4 model() const {
-				const glm::mat4 transformX = glm::rotate( math::IDENTITY_M4,glm::radians(m_euler.x), glm::vec3(1.0f, 0.0f, 0.0f) );
-				const glm::mat4 transformY = glm::rotate( math::IDENTITY_M4, glm::radians(m_euler.y), glm::vec3(0.0f, 1.0f, 0.0f) );
-				const glm::mat4 transformZ = glm::rotate( math::IDENTITY_M4, glm::radians(m_euler.z), glm::vec3(0.0f, 0.0f, 1.0f) );
+			[[nodiscard]]
+			inline mat4 local() const {
+				const glm::mat4 transformX = glm::rotate( math::IDENTITY_M4,glm::radians(m_euler.x), AXIS_X );
+				const glm::mat4 transformY = glm::rotate( math::IDENTITY_M4, glm::radians(m_euler.y), AXIS_Y );
+				const glm::mat4 transformZ = glm::rotate( math::IDENTITY_M4, glm::radians(m_euler.z), AXIS_Z );
 
 				const auto rotation = transformY * transformX * transformZ;
 				return glm::translate(math::IDENTITY_M4, m_origin)
@@ -171,12 +176,20 @@ namespace fggl::math {
 					* glm::scale( math::IDENTITY_M4, m_scale );
 			}
 
+			[[nodiscard]]
+			inline mat4 model() const {
+				return local();
+			}
+
+			inline void update(const math::mat4& parent) {
+				m_model = parent * local();
+			}
+
 		private:
 			mat4 m_model; // us -> world
 			vec3 m_origin;
 			vec3 m_euler;
 			vec3 m_scale;
-
 	};
 
 }