From f3e0d2777a6850a5cd722320423448e1158c0ee0 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Thu, 17 Jan 2019 08:45:23 -0800
Subject: [PATCH] Add strafing

---
 demo3/src/main.rs     | 10 ++++++++++
 geometry/src/point.rs | 15 +++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/demo3/src/main.rs b/demo3/src/main.rs
index 459a06f9..34ef6449 100644
--- a/demo3/src/main.rs
+++ b/demo3/src/main.rs
@@ -138,10 +138,20 @@ fn main() {
                 Event::KeyDown { keycode: Some(Keycode::S), .. } => {
                     camera_velocity.set_z(CAMERA_VELOCITY)
                 }
+                Event::KeyDown { keycode: Some(Keycode::A), .. } => {
+                    camera_velocity.set_x(-CAMERA_VELOCITY)
+                }
+                Event::KeyDown { keycode: Some(Keycode::D), .. } => {
+                    camera_velocity.set_x(CAMERA_VELOCITY)
+                }
                 Event::KeyUp { keycode: Some(Keycode::W), .. } |
                 Event::KeyUp { keycode: Some(Keycode::S), .. } => {
                     camera_velocity.set_z(0.0);
                 }
+                Event::KeyUp { keycode: Some(Keycode::A), .. } |
+                Event::KeyUp { keycode: Some(Keycode::D), .. } => {
+                    camera_velocity.set_x(0.0);
+                }
                 _ => {}
             }
         }
diff --git a/geometry/src/point.rs b/geometry/src/point.rs
index 27cfc57b..65eaf51b 100644
--- a/geometry/src/point.rs
+++ b/geometry/src/point.rs
@@ -140,11 +140,26 @@ impl Point4DF32 {
         self.0[3]
     }
 
+    #[inline]
+    pub fn set_x(&mut self, x: f32) {
+        self.0[0] = x
+    }
+
+    #[inline]
+    pub fn set_y(&mut self, y: f32) {
+        self.0[1] = y
+    }
+
     #[inline]
     pub fn set_z(&mut self, z: f32) {
         self.0[2] = z
     }
 
+    #[inline]
+    pub fn set_w(&mut self, w: f32) {
+        self.0[3] = w
+    }
+
     #[inline]
     pub fn perspective_divide(self) -> Point4DF32 {
         self * Point4DF32::splat(1.0 / self.w())