Externalize the freecam

demo/scripts/freecam.lua

@@ -0,0 +1,62 @@
+local freecam = {}
+
+local min = math.min
+local max = math.max
+
+freecam.camera = nil
+freecam.speed = 30
+
+local vx = 0.0
+local vy = 0.0
+local vz = 0.0
+
+local cam_rot_x = 0.0
+local cam_rot_y = 0.0
+
+function freecam.init_camera()
+   freecam.camera = couch.Camera()
+   freecam.camera:MakeCurrent()
+end
+
+function freecam.update_camera(delta)
+   local camera_transform = freecam.camera:GetTransform()
+
+   local move_vec = couch.Vector3()
+   move_vec = camera_transform.position + camera_transform:Forward() * delta * vz * freecam.speed
+   move_vec = move_vec + camera_transform:Right() * delta * vx * freecam.speed
+   move_vec = move_vec + camera_transform:Up() * delta * vy * freecam.speed
+   camera_transform.position = move_vec
+
+   camera_transform.rotation.y = camera_transform.rotation.y - cam_rot_x * delta
+   cam_rot_x = 0.0
+   camera_transform.rotation.x = camera_transform.rotation.x - cam_rot_y * delta
+   camera_transform.rotation.x = min(max(camera_transform.rotation.x, -3.14 / 2.0), 3.13 / 2.0)
+   cam_rot_y = 0.0
+
+   freecam.camera:SetTransform(camera_transform)
+end
+
+function action_dir(key, action, pos, neg, curr)
+   if key == pos and action == couch.ACTION_PRESS then
+      return 1.0
+   elseif key == neg and action == couch.ACTION_PRESS then
+      return -1.0
+   elseif (key == pos or key == neg) and action == couch.ACTION_RELEASE then
+      return 0.0
+   else
+      return curr
+   end
+end
+
+function freecam.onkey(key, code, action, mod)
+   vz = action_dir(key, action, couch.KEY_W, couch.KEY_S, vz)
+   vx = action_dir(key, action, couch.KEY_D, couch.KEY_A, vx)
+   vy = action_dir(key, action, couch.KEY_SPACE, couch.KEY_LEFT_CONTROL, vy)
+end
+
+function freecam.onmousemotion(relx, rely)
+   cam_rot_x = relx
+   cam_rot_y = rely
+end
+
+return freecam