From 8dfddcd7dba3752ab44fd9f30cc1533561aabe75 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Tue, 20 Sep 2016 22:21:32 +0200
Subject: api/tracker: merge from unstable

- fix gimbal lock
- use right Tait-Bryan conversion to/from matrix, not generic
inapplicable euler conversion
- adjust for timer inaccuracy, therefore running at constant Hz
that's actually the specified Hz
---
 opentrack-compat/nan.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 opentrack-compat/nan.cpp

(limited to 'opentrack-compat/nan.cpp')

diff --git a/opentrack-compat/nan.cpp b/opentrack-compat/nan.cpp
new file mode 100644
index 00000000..899b907a
--- /dev/null
+++ b/opentrack-compat/nan.cpp
@@ -0,0 +1,17 @@
+#include <cmath>
+#include "export.hpp"
+
+#if defined(__GNUC__)
+extern "C" OPENTRACK_COMPAT_EXPORT bool __attribute__ ((noinline)) nanp(double value)
+#elif defined(_WIN32)
+extern "C" OPENTRACK_COMPAT_EXPORT __declspec(noinline) bool nanp(double value)
+#else
+extern "C" OPENTRACK_COMPAT_EXPORT bool nanp(double value)
+#endif
+{
+    using std::isnan;
+    using std::isinf;
+
+    const volatile double x = value;
+    return isnan(x) || isinf(x);
+}
-- 
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