Began adding in Timer features.

DotSDL/Graphics/SdlWindow.cs

@@ -15,6 +15,9 @@ namespace DotSDL.Graphics {
         private Canvas _canvas;
         private bool _running;
 
+        private uint _nextVideoUpdate;
+        private uint _nextGameUpdate;
+
         /// <summary>The width of the user window.</summary>
         public int WindowWidth { get; }
         /// <summary>The height of the user window.</summary>
@@ -25,6 +28,13 @@ namespace DotSDL.Graphics {
         /// <summary>The height of the internal texture used by this <see cref="SdlWindow"/>.</summary>
         public int TextureHeight { get; }
 
+        /// <summary>The amount of time, in milliseconds, from when the application was started.</summary>
+        public uint TicksElapsed => Timer.GetTicks();
+        /// <summary>Gets or sets the amount of time, in milliseconds, between video updates.</summary>
+        public uint VideoUpdateTicks { get; set; }
+        /// <summary>Gets or sets the amount of time, in milliseconds, between game (logic) updates.</summary>
+        public uint GameUpdateTicks { get; set; }
+
         /// <summary>
         /// Indicates that the window manager should position the window. To place the window on a specific display, use the <see cref="WindowPosCenteredDisplay"/> function.
         /// </summary>

DotSDL/Sdl/Timer.cs

@@ -0,0 +1,15 @@
+using System.Runtime.InteropServices;
+
+namespace DotSDL.Sdl {
+    /// <summary>
+    /// Contains the necessary constants and function imports from SDL_timer.h.
+    /// </summary>
+    internal static class Timer {
+        /// <summary>
+        /// Retrieves the number of milliseconds since the SDL library was initialized.
+        /// </summary>
+        /// <returns>The number of milliseconds since the SDL library was initialized.</returns>
+        [DllImport(Meta.DllName, EntryPoint = "SDL_GetTicks", CallingConvention = CallingConvention.Cdecl)]
+        internal static extern uint GetTicks();
+    }
+}