initial commit, 4.5 stable

thirdparty/msdfgen/core/arithmetics.hpp

@@ -0,0 +1,63 @@
+
+#pragma once
+
+#include <cmath>
+#include "base.h"
+
+namespace msdfgen {
+
+/// Returns the smaller of the arguments.
+template <typename T>
+inline T min(T a, T b) {
+    return b < a ? b : a;
+}
+
+/// Returns the larger of the arguments.
+template <typename T>
+inline T max(T a, T b) {
+    return a < b ? b : a;
+}
+
+/// Returns the middle out of three values
+template <typename T>
+inline T median(T a, T b, T c) {
+    return max(min(a, b), min(max(a, b), c));
+}
+
+/// Returns the weighted average of a and b.
+template <typename T, typename S>
+inline T mix(T a, T b, S weight) {
+    return T((S(1)-weight)*a+weight*b);
+}
+
+/// Clamps the number to the interval from 0 to 1.
+template <typename T>
+inline T clamp(T n) {
+    return n >= T(0) && n <= T(1) ? n : T(n > T(0));
+}
+
+/// Clamps the number to the interval from 0 to b.
+template <typename T>
+inline T clamp(T n, T b) {
+    return n >= T(0) && n <= b ? n : T(n > T(0))*b;
+}
+
+/// Clamps the number to the interval from a to b.
+template <typename T>
+inline T clamp(T n, T a, T b) {
+    return n >= a && n <= b ? n : n < a ? a : b;
+}
+
+/// Returns 1 for positive values, -1 for negative values, and 0 for zero.
+template <typename T>
+inline int sign(T n) {
+    return (T(0) < n)-(n < T(0));
+}
+
+/// Returns 1 for non-negative values and -1 for negative values.
+template <typename T>
+inline int nonZeroSign(T n) {
+    return 2*(n > T(0))-1;
+}
+
+}