From 97ffe2efb559d5540c4d198a07deb504d29846af Mon Sep 17 00:00:00 2001
From: Lightling <contactlightling@gmail.com>
Date: Sun, 13 Feb 2022 12:46:26 -0500
Subject: [PATCH] right/up/forward vectors

---
 Transform.cpp | 24 ++++++++++++++++++++++++
 Transform.h   |  7 +++++++
 2 files changed, 31 insertions(+)

diff --git a/Transform.cpp b/Transform.cpp
index ca04871..2281e0a 100644
--- a/Transform.cpp
+++ b/Transform.cpp
@@ -38,6 +38,21 @@ DirectX::XMFLOAT4X4 Transform::GetWorldMatrixInverseTranspose()
 	return worldMatrixInverseTranspose;
 }
 
+DirectX::XMFLOAT3 Transform::GetRight()
+{
+	return right;
+}
+
+DirectX::XMFLOAT3 Transform::GetUp()
+{
+	return up;
+}
+
+DirectX::XMFLOAT3 Transform::GetForward()
+{
+	return forward;
+}
+
 // XMVECTOR & XMStoreFloat compiles down to something faster than position += x,y,z because it happens all at once
 
 void Transform::SetPosition(float _x, float _y, float _z)
@@ -52,6 +67,7 @@ void Transform::SetRotation(float _pitch, float _yaw, float _roll)
 	XMVECTOR newRotation = XMVectorSet(_pitch, _yaw, _roll, 0);
 	XMStoreFloat3(&eulerAngles, newRotation);
 	worldMatrixChanged = true;
+	UpdateDirections();
 }
 
 void Transform::SetScale(float _x, float _y, float _z)
@@ -84,6 +100,7 @@ void Transform::Rotate(float _pitch, float _yaw, float _roll)
 	XMVECTOR offset = XMVectorSet(_pitch, _yaw, _roll, 0);
 	XMStoreFloat3(&eulerAngles, newRotation + offset);
 	worldMatrixChanged = true;
+	UpdateDirections();
 }
 
 void Transform::Scale(float _x, float _y, float _z)
@@ -103,3 +120,10 @@ void Transform::UpdateWorldMatrix()
 	XMStoreFloat4x4(&worldMatrix, matrixScale * matrixRotation * matrixPosition);
 	XMStoreFloat4x4(&worldMatrixInverseTranspose, XMMatrixInverse(0, XMMatrixTranspose(XMLoadFloat4x4(&worldMatrix))));
 }
+
+void Transform::UpdateDirections()
+{
+	XMStoreFloat3(&right,   XMVector3Rotate(XMVectorSet(1, 0, 0, 0), XMQuaternionRotationRollPitchYaw(eulerAngles.x, eulerAngles.y, eulerAngles.z)));
+	XMStoreFloat3(&up,      XMVector3Rotate(XMVectorSet(0, 1, 0, 0), XMQuaternionRotationRollPitchYaw(eulerAngles.x, eulerAngles.y, eulerAngles.z)));
+	XMStoreFloat3(&forward, XMVector3Rotate(XMVectorSet(0, 0, 1, 0), XMQuaternionRotationRollPitchYaw(eulerAngles.x, eulerAngles.y, eulerAngles.z)));
+}
diff --git a/Transform.h b/Transform.h
index 25e47ff..2039dad 100644
--- a/Transform.h
+++ b/Transform.h
@@ -13,6 +13,9 @@ public:
 	DirectX::XMFLOAT3		GetScale();
 	DirectX::XMFLOAT4X4		GetWorldMatrix();
 	DirectX::XMFLOAT4X4		GetWorldMatrixInverseTranspose();
+	DirectX::XMFLOAT3		GetRight();
+	DirectX::XMFLOAT3		GetUp();
+	DirectX::XMFLOAT3		GetForward();
 
 	void					SetPosition(float _x, float _y, float _z);
 	void					SetRotation(float _pitch, float _yaw, float _roll);
@@ -30,6 +33,10 @@ private:
 	DirectX::XMFLOAT4X4		worldMatrix;
 	DirectX::XMFLOAT4X4		worldMatrixInverseTranspose;
 	bool					worldMatrixChanged;
+	DirectX::XMFLOAT3		right;
+	DirectX::XMFLOAT3		up;
+	DirectX::XMFLOAT3		forward;
 
 	void					UpdateWorldMatrix();
+	void					UpdateDirections();
 };