Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 115 insertions, 0 deletions

diff --git a/src/VBox/GuestHost/OpenGL/util/rand.c b/src/VBox/GuestHost/OpenGL/util/rand.c
new file mode 100644
index 00000000..519871de
--- /dev/null
+++ b/src/VBox/GuestHost/OpenGL/util/rand.c
@@ -0,0 +1,115 @@
+/* Copyright (c) 2001, Stanford University
+ * All rights reserved
+ *
+ * See the file LICENSE.txt for information on redistributing this software.
+ */
+
+#include "cr_rand.h"
+
+#ifdef WINDOWS
+#define WIN32_LEAN_AND_MEAN
+# ifdef VBOX
+#  include <iprt/win/windows.h>
+# else
+#include <windows.h>
+# endif
+#else
+#include <sys/time.h>
+#endif
+
+
+/* Period parameters */
+#define N 624
+#define M 397
+#define MATRIX_A 0x9908b0df   /* constant vector a */
+#define UPPER_MASK 0x80000000 /* most significant w-r bits */
+#define LOWER_MASK 0x7fffffff /* least significant r bits */
+
+/* Tempering parameters */
+#define TEMPERING_MASK_B 0x9d2c5680
+#define TEMPERING_MASK_C 0xefc60000
+#define TEMPERING_SHIFT_U(y)  (y >> 11)
+#define TEMPERING_SHIFT_S(y)  (y << 7)
+#define TEMPERING_SHIFT_T(y)  (y << 15)
+#define TEMPERING_SHIFT_L(y)  (y >> 18)
+
+static unsigned long mt[N]; /* the array for the state vector  */
+static int mti=N+1; /* mti==N+1 means mt[N] is not initialized */
+
+void crRandSeed(unsigned long seed)
+{
+	/* setting initial seeds to mt[N] using the generator Line 25 of Table 1
+	   in [KNUTH 1981, The Art of Computer Programming Vol. 2 (2nd Ed.),
+	   pp102
+	*/
+	if (seed == 0)
+		seed = 4357;   /* pick default seed if seed=0 (Guy Zadickario) */
+	mt[0]= seed & 0xffffffff;
+	for (mti=1; mti<N; mti++)
+		mt[mti] = (69069 * mt[mti-1]) & 0xffffffff;
+}
+
+
+/*
+ * Seed the generator based on time of day or a system counter.
+ */
+void crRandAutoSeed(void)
+{
+#if defined(WINDOWS)
+	LARGE_INTEGER counter;
+	QueryPerformanceCounter( &counter );
+	crRandSeed((unsigned long) counter.QuadPart);
+#else
+	struct timeval timeofday;
+	gettimeofday( &timeofday, 0 );	
+	crRandSeed((unsigned long) timeofday.tv_usec);
+#endif
+}
+
+
+static double genrand( void ) 
+{
+	unsigned long y;
+	static unsigned long mag01[2]={0x0, MATRIX_A};
+	/* mag01[x] = x * MATRIX_A  for x=0,1 */
+
+	if (mti >= N) { /* generate N words at one time */
+		int kk;
+		if (mti == N+1)   /* if sgenrand() has not been called, */
+			crRandSeed(4357); /* a default initial seed is used   */
+
+		for (kk=0;kk<N-M;kk++) {
+			y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
+			mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1];
+		}
+		for (;kk<N-1;kk++) {
+			y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
+			mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1];
+		}
+		y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
+		mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1];
+		mti = 0;
+	}
+
+	y = mt[mti++];
+	y ^= TEMPERING_SHIFT_U(y);
+	y ^= TEMPERING_SHIFT_S(y) & TEMPERING_MASK_B;
+	y ^= TEMPERING_SHIFT_T(y) & TEMPERING_MASK_C;
+	y ^= TEMPERING_SHIFT_L(y);
+
+	return ( (double)y / (unsigned long)0xffffffff ); /* reals */
+	/* return y; */ /* for integer generation */
+}
+
+float crRandFloat(float min, float max) 
+{
+	double t = genrand();
+	return (float) (t*min + (1-t)*max);
+}
+
+/* return a random integer in [min, max] (inclusive). */
+int crRandInt(int min, int max)
+{
+	double t = genrand();
+	return min + (int) (t * (max - min + 1));
+}