From 532b1b2c4dafd4bcac1c2ebe62b1992a338b219c Mon Sep 17 00:00:00 2001
From: SirLynix <lynix680@gmail.com>
Date: Fri, 25 Aug 2023 17:13:07 +0200
Subject: [PATCH] Math/Frustum: Add ComputeCorners and GetAABB

---
 include/Nazara/Math/Frustum.hpp |  2 ++
 include/Nazara/Math/Frustum.inl | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/include/Nazara/Math/Frustum.hpp b/include/Nazara/Math/Frustum.hpp
index cd4be1780..a9663f91a 100644
--- a/include/Nazara/Math/Frustum.hpp
+++ b/include/Nazara/Math/Frustum.hpp
@@ -37,6 +37,7 @@ namespace Nz
 			constexpr bool ApproxEqual(const Frustum& frustum, T maxDifference = std::numeric_limits<T>::epsilon()) const;
 
 			constexpr Vector3<T> ComputeCorner(BoxCorner corner) const;
+			constexpr EnumArray<BoxCorner, Vector3<T>> ComputeCorners() const;
 
 			constexpr bool Contains(const BoundingVolume<T>& volume) const;
 			constexpr bool Contains(const Box<T>& box) const;
@@ -45,6 +46,7 @@ namespace Nz
 			constexpr bool Contains(const Vector3<T>& point) const;
 			constexpr bool Contains(const Vector3<T>* points, std::size_t pointCount) const;
 
+			constexpr const Box<T>& GetAABB() const;
 			constexpr const Plane<T>& GetPlane(FrustumPlane plane) const;
 			constexpr const EnumArray<FrustumPlane, Plane<T>>& GetPlanes() const;
 
diff --git a/include/Nazara/Math/Frustum.inl b/include/Nazara/Math/Frustum.inl
index 92595614c..fee6ad71b 100644
--- a/include/Nazara/Math/Frustum.inl
+++ b/include/Nazara/Math/Frustum.inl
@@ -85,6 +85,21 @@ namespace Nz
 		return Vector3<T>();
 	}
 
+	template<typename T>
+	constexpr EnumArray<BoxCorner, Vector3<T>> Frustum<T>::ComputeCorners() const
+	{
+		return {
+			ComputeCorner(BoxCorner::FarLeftBottom),
+			ComputeCorner(BoxCorner::FarLeftTop),
+			ComputeCorner(BoxCorner::FarRightBottom),
+			ComputeCorner(BoxCorner::FarRightTop),
+			ComputeCorner(BoxCorner::NearLeftBottom),
+			ComputeCorner(BoxCorner::NearLeftTop),
+			ComputeCorner(BoxCorner::NearRightBottom),
+			ComputeCorner(BoxCorner::NearRightTop)
+		};
+	}
+
 	/*!
 	* \brief Checks whether or not a bounding volume is contained in the frustum
 	* \return true if the bounding volume is entirely in the frustum
@@ -229,6 +244,22 @@ namespace Nz
 		return true;
 	}
 
+	template<typename T>
+	constexpr const Box<T>& Frustum<T>::GetAABB() const
+	{
+		EnumArray<BoxCorner, Vector3<T>> corners = ComputeCorners();
+
+		Vector3f max = corners.front();
+		Vector3f min = corners.front();
+		for (std::size_t i = 1; i < corners.size(); ++i)
+		{
+			max.Maximize(corners[static_cast<BoxCorner>(i)]);
+			min.Minimize(corners[static_cast<BoxCorner>(i)]);
+		}
+
+		return Box<T>::FromExtends(min, max);
+	}
+
 	/*!
 	* \brief Gets the Plane for the face
 	* \return The face of the frustum according to enum FrustumPlane