some: replace hardcoded pi values with the same pi constant

We can't depend on M_PI existing after including cmath.

1 files changed, 2 insertions, 1 deletions

diff --git a/tracker-pt/ftnoir_tracker_pt_settings.h b/tracker-pt/ftnoir_tracker_pt_settings.h
index 830bf92e..f5256f18 100644
--- a/tracker-pt/ftnoir_tracker_pt_settings.h
+++ b/tracker-pt/ftnoir_tracker_pt_settings.h
@@ -8,6 +8,7 @@
 
 #pragma once
 
+#include "opentrack-compat/pi-constant.hpp"
 #include <limits>
 #include <opencv2/core.hpp>
 
@@ -16,7 +17,7 @@ struct pt_types
     using f = double;
 
     static constexpr f eps = std::numeric_limits<f>::epsilon();
-    static constexpr f pi = f(3.14159265358979323846);
+    static constexpr f pi = f(OPENTRACK_PI);
 
     template<int n> using vec = cv::Vec<f, n>;
     using vec2 = vec<2>;