X-Git-Url: https://git.xonotic.org/?a=blobdiff_plain;f=mathlib.c;h=dae0de50ba070a4f144e6830e47e5fa4da125700;hb=8b0fbc64175362acf3ea872029a423012b76a4f8;hp=cbd57db1d5d68458324733e17218a62cd512b8e4;hpb=c453c06f26904784393999a0173257258035bb11;p=xonotic%2Fdarkplaces.git

diff --git a/mathlib.c b/mathlib.c
index cbd57db1..dae0de50 100644
--- a/mathlib.c
+++ b/mathlib.c
@@ -523,8 +523,16 @@ void AnglesFromVectors (vec3_t angles, const vec3_t forward, const vec3_t up, qb
 {
 	if (forward[0] == 0 && forward[1] == 0)
 	{
-		angles[PITCH] = forward[2] > 0 ? -M_PI * 0.5 : M_PI * 0.5;
-		angles[YAW] = up ? atan2(-up[1], -up[0]) : 0;
+		if(forward[2] > 0)
+		{
+			angles[PITCH] = -M_PI * 0.5;
+			angles[YAW] = up ? atan2(-up[1], -up[0]) : 0;
+		}
+		else
+		{
+			angles[PITCH] = M_PI * 0.5;
+			angles[YAW] = up ? atan2(up[1], up[0]) : 0;
+		}
 		angles[ROLL] = 0;
 	}
 	else
@@ -748,3 +756,12 @@ void BoxFromPoints(vec3_t mins, vec3_t maxs, int numpoints, vec_t *point3f)
 	}
 }
 
+// LordHavoc: this has to be done right or you get severe precision breakdown
+int LoopingFrameNumberFromDouble(double t, int loopframes)
+{
+	if (loopframes)
+		return (int)(t - floor(t/loopframes)*loopframes);
+	else
+		return (int)t;
+}
+