Added basic player movement.

include/dawn/game/gametime.h

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+
+#define GAMETIME_STEP 0.016
+
+typedef struct {
+  /**
+   * Current time (as a float of seconds since game start).
+   * 
+   * When time is initialized this will start at a fixed value of 2/60ths of a 
+   * second, regardless of what engine the game is running.
+   * 
+   * This is to avoid any divide by zero errors.
+   */
+  float current;
+
+  /**
+   * Last Time (as a float of seconds since the game start).
+   * 
+   * This value will start at 1/60th of a second regardless of engine the game
+   * is running on to avoid divide by zero errors.
+   */
+  float last;
+
+  /**
+   * Fixed timestep that occured since the last frame. Typically locked to 1/60
+   * steps per second.
+   */
+  float delta;
+} gametime_t;
+
+extern gametime_t TIME_STATE;