Merge branch 'master' into martin-t/globals

[xonotic/xonotic-data.pk3dir.git] / qcsrc / lib / warpzone / mathlib.qc

diff --git a/qcsrc/lib/warpzone/mathlib.qc b/qcsrc/lib/warpzone/mathlib.qc
index 4a7c8861069f7eb8420ec819b9525d606ffbe2d2..9105269ff32ebbc00d9c54e832557943412cedd4 100644 (file)
--- a/qcsrc/lib/warpzone/mathlib.qc
+++ b/qcsrc/lib/warpzone/mathlib.qc
@@ -24,8 +24,13 @@ bool isinf(float e)
 }
 bool isnan(float e)
 {
-       float f = e;
-       return (e != f);
+       // the sane way to detect NaN is broken because of a compiler bug
+       // (works with constants but breaks when assigned to variables)
+       // use conversion to string instead
+
+       //float f = e;
+       //return (e != f);
+       return ftos(e) == "-nan";
 }
 bool isnormal(float e)
 {
@@ -217,6 +222,7 @@ float copysign(float e, float f)
 {
        return fabs(e) * ((f>0) ? 1 : -1);
 }
+/// Always use `isnan` function to compare because `float x = nan(); x == x;` gives true
 float nan(string tag)
 {
        return sqrt(-1);