1 files changed, 64 insertions, 0 deletions
diff --git a/src/platformspecific/macos/libs/nv_math/nv_math.cpp b/src/platformspecific/macos/libs/nv_math/nv_math.cpp
new file mode 100644
index 0000000..b83cb39
--- /dev/null
+++ b/src/platformspecific/macos/libs/nv_math/nv_math.cpp
@@ -0,0 +1,64 @@
+/****************************************************************************
+**
+** Copyright (C) 2009-2011 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "nv_math.h"
+
+static const double a = 16807.0;
+static const double m = 2147483647.0;
+
+static double nextSeed(double seed)
+{
+    double t = a * seed;
+    return t - m * (double)((int)(t / m));
+}
+
+GLfloat NvRandf()
+{
+    static double seed = 1.0;
+    seed = nextSeed(seed);
+    return (GLfloat)(seed * (1 / m));
+}
+
+GLfloat NvClockDiffInSecs(long long int newTime, long long int oldTime)
+{
+    // kdGetTimeUST is never supposed to decrease (i.e. that
+    // means it can't wrap, either.  IIRC, it will wrap in
+    // 593 years).  So we ignore that option...
+
+    // Used for frame-to-frame diffs, this will fit in 32b
+    // as long as the times are < ~4.3s apart
+    long long int diffTime = newTime - oldTime;
+
+    // Need to find a better way to do this.
+    // However, I believe we will be uSec precise (not run
+    // out of mantissa bits for uSecs) as long as the diff
+    // is < ~16s  (1e-6 * (2^24))
+    return ((GLfloat)diffTime) / 1.0e9f;
+}