Added timeline

include/dawn/display/animation/easing.h

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+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+#pragma once
+
+/**
+ * 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)
+
+// Easing Functions, most were sourced from https://gist.github.com/gre/1650294
+#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-1)*(t-1)*(t-1)+1)
+#define easeInOutCubic(t) (t < .5 ? 4*t*t*t : (t-1)*(2*t-2)*(2*t-2)+1)
+
+#define easeInQuart(t) (t*t*t*t)
+#define easeOutQuart(t) (1 - (t-1)*(t-1)*(t-1)*(t-1))
+#define easeInOutQuart(t) (t < .5 ? 8*t*t*t*t : 1-8*(t-1)*(t-1)*(t-1)*(t-1))
+
+#define easeInQuint(t) (t*t*t*t*t)
+#define easeOutQuint(t) (1 + (t-1)*(t-1)*(t-1)*(t-1)*(t-1))
+#define easeInOutQuint(t) (t<.5 ? 16*t*t*t*t*t : 1+16*(t-1)*(t-1)*(t-1)*(t-1)*(t-1))