Mantaflow [Part 1]: Added preprocessed Mantaflow source files

Includes preprocessed Mantaflow source files for both OpenMP and TBB (if OpenMP is not present, TBB files will be used instead).

These files come directly from the Mantaflow repository. Future updates to the core fluid solver will take place by updating the files.

Reviewed By: sergey, mont29

Maniphest Tasks: T59995

Differential Revision: https://developer.blender.org/D3850

1 files changed, 112 insertions, 0 deletions

diff --git a/extern/mantaflow/preprocessed/movingobs.cpp b/extern/mantaflow/preprocessed/movingobs.cpp
new file mode 100644
index 00000000000..a6ff01fd1e0
--- /dev/null
+++ b/extern/mantaflow/preprocessed/movingobs.cpp
@@ -0,0 +1,112 @@
+
+
+// DO NOT EDIT !
+// This file is generated using the MantaFlow preprocessor (prep generate).
+
+/******************************************************************************
+ *
+ * MantaFlow fluid solver framework
+ * Copyright 2011 Tobias Pfaff, Nils Thuerey
+ *
+ * This program is free software, distributed under the terms of the
+ * Apache License, Version 2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Moving obstacles
+ *
+ ******************************************************************************/
+
+#include "movingobs.h"
+#include "commonkernels.h"
+#include "randomstream.h"
+
+using namespace std;
+namespace Manta {
+
+//******************************************************************************
+// MovingObs class members
+
+int MovingObstacle::sIDcnt = 10;
+
+MovingObstacle::MovingObstacle(FluidSolver *parent, int emptyType)
+    : PbClass(parent), mEmptyType(emptyType)
+{
+  mID = 1 << sIDcnt;
+  sIDcnt++;
+  if (sIDcnt > 15)
+    errMsg(
+        "currently only 5 separate moving obstacles supported (are you generating them in a "
+        "loop?)");
+}
+
+void MovingObstacle::add(Shape *shape)
+{
+  mShapes.push_back(shape);
+}
+
+void MovingObstacle::projectOutside(FlagGrid &flags, BasicParticleSystem &parts)
+{
+  LevelsetGrid levelset(mParent, false);
+  Grid<Vec3> gradient(mParent);
+
+  // rebuild obstacle levelset
+  FOR_IDX(levelset)
+  {
+    levelset[idx] = flags.isObstacle(idx) ? -0.5 : 0.5;
+  }
+  levelset.reinitMarching(flags, 6.0, 0, true, false, FlagGrid::TypeReserved);
+
+  // build levelset gradient
+  GradientOp(gradient, levelset);
+
+  parts.projectOutside(gradient);
+}
+
+void MovingObstacle::moveLinear(
+    Real t, Real t0, Real t1, Vec3 p0, Vec3 p1, FlagGrid &flags, MACGrid &vel, bool smooth)
+{
+  Real alpha = (t - t0) / (t1 - t0);
+  if (alpha >= 0 && alpha <= 1) {
+    Vec3 v = (p1 - p0) / ((t1 - t0) * getParent()->getDt());
+
+    // ease in and out
+    if (smooth) {
+      v *= 6.0f * (alpha - square(alpha));
+      alpha = square(alpha) * (3.0f - 2.0f * alpha);
+    }
+
+    Vec3 pos = alpha * p1 + (1.0f - alpha) * p0;
+    for (size_t i = 0; i < mShapes.size(); i++)
+      mShapes[i]->setCenter(pos);
+
+    // reset flags
+    FOR_IDX(flags)
+    {
+      if ((flags[idx] & mID) != 0)
+        flags[idx] = mEmptyType;
+    }
+    // apply new flags
+    for (size_t i = 0; i < mShapes.size(); i++) {
+#if NOPYTHON != 1
+      mShapes[i]->_args.clear();
+      mShapes[i]->_args.add("value", FlagGrid::TypeObstacle | mID);
+      mShapes[i]->applyToGrid(&flags, 0);
+#else
+      errMsg("Not yet supported...");
+#endif
+    }
+    // apply velocities
+    FOR_IJK_BND(flags, 1)
+    {
+      bool cur = (flags(i, j, k) & mID) != 0;
+      if (cur || (flags(i - 1, j, k) & mID) != 0)
+        vel(i, j, k).x = v.x;
+      if (cur || (flags(i, j - 1, k) & mID) != 0)
+        vel(i, j, k).y = v.y;
+      if (cur || (flags(i, j, k - 1) & mID) != 0)
+        vel(i, j, k).z = v.z;
+    }
+  }
+}
+
+}  // namespace Manta