Easing tests.

include/dawn/animation/easing.h

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+#pragma once
+#include "../libs.h"
+
+/**
+ * Returns the ease time for a given real time duration span.
+ * @param start At what point in time the animation started
+ * @param current The current point in time the animation is at.
+ * @param duration The total duration on the animation.
+ * @returns The easing time (0-1 time) that the animation is at.
+ */
+#define easeTimeToEase(start, current, duration) ((current-start)/duration)
+
+#define easeLinear(t) t
+
+#define easeInQuad(t) t*t
+#define easeOutQuad(t) t*(2-t)
+#define easeInOutQuad(t) (t < .5 ? 2*t*t : -1+(4-2*t)*t)
+
+#define easeInCubic(t) t*t*t
+#define easeOutCubic(t) t*(t-1)*(t-1)+1

include/dawn/dawn.h

@@ -6,6 +6,9 @@
 #pragma once
 #include "libs.h"
 
+// Animation
+#include "animation/easing.h"
+
 // Display / Rendering
 #include "display/debug/grid.h"