Fluid: Initial changes for OpenMP GPU supportfluid-mantaflow-gpu

Contains basic support for OpenMP GPU offloading.
That is, offloading of fluid KERNEL loops to the GPU.

This branch offloads pressure and advection calls only - the 2 most
expensive operation per step. In theory though, any function can be
offloaded.

For now, this branch needs to be build with a compiler that supports
Nvidia GPU offloading. Exact GPU models need to be specified via CMake.

1 files changed, 0 insertions, 13 deletions

diff --git a/extern/mantaflow/preprocessed/kernel.h b/extern/mantaflow/preprocessed/kernel.h
index dbcc2342a11..90e30cd21e1 100644
--- a/extern/mantaflow/preprocessed/kernel.h
+++ b/extern/mantaflow/preprocessed/kernel.h
@@ -71,19 +71,6 @@ class ParticleBase;
       for (int j = bnd; j < (grid).getSizeY() - bnd; ++j) \
         for (int i = bnd; i < (grid).getSizeX() - bnd; ++i)
 
-#define FOR_NEIGHBORS_BND(grid, radius, bnd) \
-  for (int zj = ((grid).is3D() ? std::max(bnd, k - radius) : 0); \
-       zj <= ((grid).is3D() ? std::min(k + radius, (grid).getSizeZ() - 1 - bnd) : 0); \
-       zj++) \
-    for (int yj = std::max(bnd, j - radius); \
-         yj <= std::min(j + radius, (grid).getSizeY() - 1 - bnd); \
-         yj++) \
-      for (int xj = std::max(bnd, i - radius); \
-           xj <= std::min(i + radius, (grid).getSizeX() - 1 - bnd); \
-           xj++)
-
-#define FOR_NEIGHBORS(grid, radius) FOR_NEIGHBORS_BND(grid, radius, 0)
-
 //! Basic data structure for kernel data, initialized based on kernel type (e.g. single, idx, etc).
 struct KernelBase {
   int maxX, maxY, maxZ, minZ, maxT, minT;