improved corner pin

io/math.cpp

@@ -0,0 +1,9 @@
+#include "math.h"
+
+int lerp(int a, int b, double t) {
+    return ((1.0 - t) * a) + (t * b);
+}
+
+double double_lerp(double a, double b, double t) {
+    return ((1.0 - t) * a) + (t * b);
+}