Initial commit

Easing.h

@@ -0,0 +1,166 @@
+#pragma once
+namespace EasingFunc {
+    float easeInSine(float t) {
+        return sin(1.5707963 * t);
+    }
+
+    float easeOutSine(float t) {
+        return 1 + sin(1.5707963 * (--t));
+    }
+
+    float easeInOutSine(float t) {
+        return 0.5 * (1 + sin(3.1415926 * (t - 0.5)));
+    }
+
+    float easeInQuad(float t) {
+        return t * t;
+    }
+
+    float easeOutQuad(float t) {
+        return t * (2 - t);
+    }
+
+    float easeInOutQuad(float t) {
+        return t < 0.5 ? 2 * t * t : t * (4 - 2 * t) - 1;
+    }
+
+    float easeInCubic(float t) {
+        return t * t * t;
+    }
+
+    float easeOutCubic(float t) {
+        return 1 + (--t) * t * t;
+    }
+
+    float easeInOutCubic(float t) {
+        return t < 0.5 ? 4 * t * t * t : 1 + (--t) * (2 * (--t)) * (2 * t);
+    }
+
+    float easeInQuart(float t) {
+        t *= t;
+        return t * t;
+    }
+
+    float easeOutQuart(float t) {
+        t = (--t) * t;
+        return 1 - t * t;
+    }
+
+    float easeInOutQuart(float t) {
+        if (t < 0.5) {
+            t *= t;
+            return 8 * t * t;
+        } else {
+            t = (--t) * t;
+            return 1 - 8 * t * t;
+        }
+    }
+
+    float easeInQuint(float t) {
+        float t2 = t * t;
+        return t * t2 * t2;
+    }
+
+    float easeOutQuint(float t) {
+        float t2 = (--t) * t;
+        return 1 + t * t2 * t2;
+    }
+
+    float easeInOutQuint(float t) {
+        float t2;
+        if (t < 0.5) {
+            t2 = t * t;
+            return 16 * t * t2 * t2;
+        } else {
+            t2 = (--t) * t;
+            return 1 + 16 * t * t2 * t2;
+        }
+    }
+
+    float easeInExpo(float t) {
+        return (pow(2, 8 * t) - 1) / 255;
+    }
+
+    float easeOutExpo(float t) {
+        return 1 - pow(2, -8 * t);
+    }
+
+    float easeInOutExpo(float t) {
+        if (t < 0.5) {
+            return (pow(2, 16 * t) - 1) / 510;
+        } else {
+            return 1 - 0.5 * pow(2, -16 * (t - 0.5));
+        }
+    }
+
+    float easeInCirc(float t) {
+        return 1 - sqrt(1 - t);
+    }
+
+    float easeOutCirc(float t) {
+        return sqrt(t);
+    }
+
+    float easeInOutCirc(float t) {
+        if (t < 0.5) {
+            return (1 - sqrt(1 - 2 * t)) * 0.5;
+        } else {
+            return (1 + sqrt(2 * t - 1)) * 0.5;
+        }
+    }
+
+    float easeInBack(float t) {
+        return t * t * (2.70158 * t - 1.70158);
+    }
+
+    float easeOutBack(float t) {
+        return 1 + (--t) * t * (2.70158 * t + 1.70158);
+    }
+
+    float easeInOutBack(float t) {
+        if (t < 0.5) {
+            return t * t * (7 * t - 2.5) * 2;
+        } else {
+            return 1 + (--t) * t * 2 * (7 * t + 2.5);
+        }
+    }
+
+    float easeInElastic(float t) {
+        float t2 = t * t;
+        return t2 * t2 * sin(t * PI * 4.5);
+    }
+
+    float easeOutElastic(float t) {
+        float t2 = (t - 1) * (t - 1);
+        return 1 - t2 * t2 * cos(t * PI * 4.5);
+    }
+
+    float easeInOutElastic(float t) {
+        float t2;
+        if (t < 0.45) {
+            t2 = t * t;
+            return 8 * t2 * t2 * sin(t * PI * 9);
+        } else if (t < 0.55) {
+            return 0.5 + 0.75 * sin(t * PI * 4);
+        } else {
+            t2 = (t - 1) * (t - 1);
+            return 1 - 8 * t2 * t2 * sin(t * PI * 9);
+        }
+    }
+
+    float easeInBounce(float t) {
+        return pow(2, 6 * (t - 1)) * abs(sin(t * PI * 3.5));
+    }
+
+    float easeOutBounce(float t) {
+        return 1 - pow(2, -6 * t) * abs(cos(t * PI * 3.5));
+    }
+
+    float easeInOutBounce(float t) {
+        if (t < 0.5) {
+            return 8 * pow(2, 8 * (t - 1)) * abs(sin(t * PI * 7));
+        } else {
+            return 1 - 8 * pow(2, -8 * t) * abs(sin(t * PI * 7));
+        }
+    }
+}