initial commit, 4.5 stable

thirdparty/msdfgen/core/SignedDistance.hpp

@@ -0,0 +1,38 @@
+
+#pragma once
+
+#include <cmath>
+#include <cfloat>
+#include "base.h"
+
+namespace msdfgen {
+
+/// Represents a signed distance and alignment, which together can be compared to uniquely determine the closest edge segment.
+class SignedDistance {
+
+public:
+    double distance;
+    double dot;
+
+    inline SignedDistance() : distance(-DBL_MAX), dot(0) { }
+    inline SignedDistance(double dist, double d) : distance(dist), dot(d) { }
+
+};
+
+inline bool operator<(const SignedDistance a, const SignedDistance b) {
+    return fabs(a.distance) < fabs(b.distance) || (fabs(a.distance) == fabs(b.distance) && a.dot < b.dot);
+}
+
+inline bool operator>(const SignedDistance a, const SignedDistance b) {
+    return fabs(a.distance) > fabs(b.distance) || (fabs(a.distance) == fabs(b.distance) && a.dot > b.dot);
+}
+
+inline bool operator<=(const SignedDistance a, const SignedDistance b) {
+    return fabs(a.distance) < fabs(b.distance) || (fabs(a.distance) == fabs(b.distance) && a.dot <= b.dot);
+}
+
+inline bool operator>=(const SignedDistance a, const SignedDistance b) {
+    return fabs(a.distance) > fabs(b.distance) || (fabs(a.distance) == fabs(b.distance) && a.dot >= b.dot);
+}
+
+}