From 25ea58edff537bd06e7e771850d8ec84ff9df65b Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Thu, 26 Oct 2023 20:34:52 +0200
Subject: feat(engine): add direction functions to Camera

---
 engine/src/camera.rs | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

(limited to 'engine')

diff --git a/engine/src/camera.rs b/engine/src/camera.rs
index 929f1a3..9ab95e7 100644
--- a/engine/src/camera.rs
+++ b/engine/src/camera.rs
@@ -38,6 +38,49 @@ impl Camera
         &self.target
     }
 
+    /// Returns the normalized direction to the current target.
+    #[must_use]
+    pub fn target_direction(&self) -> Vec3<f32>
+    {
+        -(&self.position - &self.target).normalize()
+    }
+
+    /// Returns the right direction (normalized) relative from where the camera is
+    /// currently looking.
+    #[must_use]
+    pub fn right(&self) -> Vec3<f32>
+    {
+        let rev_target_direction = (&self.position - &self.target).normalize();
+
+        Vec3::UP.cross(&rev_target_direction).normalize()
+    }
+
+    /// Returns the left direction (normalized) relative from where the camera is
+    /// currently looking.
+    #[must_use]
+    pub fn left(&self) -> Vec3<f32>
+    {
+        -self.right()
+    }
+
+    /// Returns the up direction (normalized) relative from where the camera is currently
+    /// looking.
+    #[must_use]
+    pub fn up(&self) -> Vec3<f32>
+    {
+        let rev_target_direction = (&self.position - &self.target).normalize();
+
+        rev_target_direction.cross(&self.right())
+    }
+
+    /// Returns the down direction (normalized) relative from where the camera is
+    /// currently looking.
+    #[must_use]
+    pub fn down(&self) -> Vec3<f32>
+    {
+        -self.up()
+    }
+
     pub(crate) fn new() -> Self
     {
         let position = Vec3 {
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