feat(engine): add Camera direction methods

1 files changed, 33 insertions, 1 deletions

diff --git a/engine/src/camera.rs b/engine/src/camera.rs
index 7abb9af..362e0d6 100644
--- a/engine/src/camera.rs
+++ b/engine/src/camera.rs
@@ -2,12 +2,44 @@ use crate::vector::Vec3;
 
 pub trait Camera
 {
-    /// Returns the current camera position.
+    /// Returns the camera position.
     fn position(&self) -> Vec3<f32>;
 
     /// Returns the position of the camera target.
     fn target(&self) -> Vec3<f32>;
 
+    /// Returns the direction the camera is looking.
+    fn direction(&self) -> Vec3<f32>
+    {
+        self.target() - self.position()
+    }
+
+    /// Returns the right direction relative from where the camera is looking.
+    fn right(&self) -> Vec3<f32>
+    {
+        self.direction().cross(&self.global_up()).normalize()
+    }
+
+    /// Returns the left direction relative from where the camera is looking.
+    fn left(&self) -> Vec3<f32>
+    {
+        -self.right()
+    }
+
+    /// Returns the upwards direction relative from where the camera is looking.
+    fn up(&self) -> Vec3<f32>
+    {
+        let rev_direction = -self.direction();
+
+        rev_direction.cross(&self.right())
+    }
+
+    /// Returns the downwards direction relative from where the camera is looking.
+    fn down(&self) -> Vec3<f32>
+    {
+        -self.up()
+    }
+
     /// Returns the global direction upwards.
     ///
     /// The default implementation which returns [`Vec3::UP`] should be fine in most