X-Git-Url: https://git.xonotic.org/?a=blobdiff_plain;f=mathlib.h;h=0acb9500627fc2e3aa20f3c20f83c304e05273d3;hb=dfc53802fb3f67b604e61a92fc6a268651b38b04;hp=cb674e51a38affd019b3f023ad9e038f824da038;hpb=98a14be269dba68ac9a23c23d094687e83dbdb40;p=xonotic%2Fdarkplaces.git

diff --git a/mathlib.h b/mathlib.h
index cb674e51..0acb9500 100644
--- a/mathlib.h
+++ b/mathlib.h
@@ -181,9 +181,10 @@ int PointInfrontOfTriangle(const float *p, const float *a, const float *b, const
 }
 #endif
 
-#define lhcheeserand() (seed = (seed * 987211u) ^ (seed >> 13u) ^ 914867)
-#define lhcheeserandom(MIN,MAX) ((double)(lhcheeserand() + 0.5) / ((double)4096.0*1024.0*1024.0) * ((MAX)-(MIN)) + (MIN))
-#define VectorCheeseRandom(v) do{(v)[0] = lhcheeserandom(-1, 1);(v)[1] = lhcheeserandom(-1, 1);(v)[2] = lhcheeserandom(-1, 1);}while(DotProduct(v, v) > 1)
+#define lhcheeserand(seed) ((seed) = ((seed) * 987211u) ^ ((seed) >> 13u) ^ 914867)
+#define lhcheeserandom(seed,MIN,MAX) ((double)(lhcheeserand(seed) + 0.5) / ((double)4096.0*1024.0*1024.0) * ((MAX)-(MIN)) + (MIN))
+#define VectorCheeseRandom(seed,v) do{(v)[0] = lhcheeserandom(seed,-1, 1);(v)[1] = lhcheeserandom(seed,-1, 1);(v)[2] = lhcheeserandom(seed,-1, 1);}while(DotProduct(v, v) > 1)
+#define VectorLehmerRandom(seed,v) do{(v)[0] = Math_crandomf(seed);(v)[1] = Math_crandomf(seed);(v)[2] = Math_crandomf(seed);}while(DotProduct(v, v) > 1)
 
 /*
 // LordHavoc: quaternion math, untested, don't know if these are correct,
@@ -301,6 +302,22 @@ void BoxFromPoints(vec3_t mins, vec3_t maxs, int numpoints, vec_t *point3f);
 
 int LoopingFrameNumberFromDouble(double t, int loopframes);
 
+// implementation of 128bit Lehmer Random Number Generator with 2^126 period
+// https://en.wikipedia.org/Lehmer_random_number_generator
+typedef struct randomseed_s
+{
+	unsigned int s[4];
+}
+randomseed_t;
+
+void Math_RandomSeed_Reset(randomseed_t *r);
+void Math_RandomSeed_FromInts(randomseed_t *r, unsigned int s0, unsigned int s1, unsigned int s2, unsigned int s3);
+unsigned long long Math_rand64(randomseed_t *r);
+float Math_randomf(randomseed_t *r);
+float Math_crandomf(randomseed_t *r);
+float Math_randomrangef(randomseed_t *r, float minf, float maxf);
+int Math_randomrangei(randomseed_t *r, int mini, int maxi);
+
 void Mathlib_Init(void);
 
 #endif