[Update] Projection Matrix invertedZ

Include/SA/Maths/Matrix/Matrix4.hpp

@@ -406,7 +406,7 @@ namespace SA
 		*
 		*	\return perspective matrix.
 		*/
-		static Mat4 MakePerspective(T _fov = T(90.0), T _aspect = T(1.0), T _near = T(0.35), T _far = T(10.0)) noexcept;
+		static Mat4 MakePerspective(T _fov = T(90.0), T _aspect = T(1.0), T _near = T(0.35), T _far = T(10.0), bool _bInvertedZ = false) noexcept;
 
 //}
 

Include/SA/Maths/Matrix/Matrix4.inl

@@ -551,18 +551,34 @@ namespace SA
 
 
 	template <typename T, MatrixMajor major>
-	Mat4<T, major> Mat4<T, major>::MakePerspective(T _fov, T _aspect, T _near, T _far) noexcept
-	{
-		// TODO: Clean.
-		//const T scale = T(1) / std::tan((_fov / T(2)) * Maths::DegToRad<T>);
-		T tan_half_angle = std::tan(Maths::DegToRad<T> * _fov / T(2));
-
-		return Mat4(
-			1 / (_aspect * tan_half_angle), 0, 0, 0,
-			0, 1 / (tan_half_angle), 0, 0,
-			0, 0, -_far / (_far - _near), -(2 * _far * _near) / (_far - _near),
-			0, 0, -1, 0
-		);
+	Mat4<T, major> Mat4<T, major>::MakePerspective(T _fov, T _aspect, T _near, T _far, bool _bInvertedZ) noexcept
+	{
+		const T focalLength = T(1) / std::tan(Maths::DegToRad<T> * _fov / T(2));
+
+		if (_bInvertedZ)
+		{
+			//const T A = _near / (_far - _near);
+			//const T B = (_far * _near) / (_far - _near);
+
+			return Mat4(
+				_aspect / focalLength,	0,						0,		0,
+				0,						T(1) / focalLength,		0,		0,
+				0,						0,						0,		(_far - _near) / (_far * _near) /* 1 / B */,
+				0,						0,						-1,		(_far - _near) / (_far * _far - _far) /* A / B */
+			);
+
+		}
+		else
+		{
+			// GLM implementation.
+
+			return Mat4(
+				focalLength / _aspect,	0,					0,									0,
+				0,						focalLength,		0,									0,
+				0,						0,					-(_far + _near) / (_far - _near),	-(2 * _far * _near) / (_far - _near),
+				0,						0,					-1,									0
+			);
+		}
 	}
 
 //}