First attempt at a summation by parts finite differencing thorn.

git-svn-id: https://svn.cct.lsu.edu/repos/numrel/LSUThorns/SummationByParts/trunk@2 f69c4107-0314-4c4f-9ad4-17e986b73f4a

1 files changed, 105 insertions, 0 deletions

diff --git a/src/call_derivs.c b/src/call_derivs.c
new file mode 100644
index 0000000..c696e4e
--- /dev/null
+++ b/src/call_derivs.c
@@ -0,0 +1,105 @@
+#include "cctk.h"
+#include "cctk_Parameters.h"
+
+#include <assert.h>
+
+void DiffGf ( const CCTK_POINTER cctkGH, const CCTK_INT dir,
+              const char *var_name, const char *dvar_name )
+{
+  CCTK_REAL *var, *dvar;
+  CCTK_INT ni, nj, nk, gsize, ic;
+  CCTK_REAL delta;
+  CCTK_REAL phys_min[3], phys_max[3];
+  CCTK_REAL int_min[3], int_max[3];
+  CCTK_REAL ext_min[3], ext_max[3];
+  CCTK_REAL spacing[3];
+  CCTK_INT ierr;
+  CCTK_INT lsh[3], bbox[6], bb[2], nghostzones[3];
+  void CCTK_FCALL CCTK_FNAME(deriv_gf_2_1)(CCTK_REAL *var, const CCTK_INT *ni,
+                                       const CCTK_INT *nj, const CCTK_INT *nk,
+                                       const CCTK_INT *dir,
+                                       const CCTK_INT *bb,
+                                       const CCTK_INT *gsize,
+                                       const CCTK_REAL *delta,
+                                       CCTK_REAL *dvar);
+  void CCTK_FCALL CCTK_FNAME(deriv_gf_4_2)(CCTK_REAL *var, const CCTK_INT *ni,
+                                       const CCTK_INT *nj, const CCTK_INT *nk,
+                                       const CCTK_INT *dir,
+                                       const CCTK_INT *bb,
+                                       const CCTK_INT *gsize,
+                                       const CCTK_REAL *delta,
+                                       CCTK_REAL *dvar);
+  void CCTK_FCALL CCTK_FNAME(deriv_gf_6_3)(CCTK_REAL *var, const CCTK_INT *ni,
+                                       const CCTK_INT *nj, const CCTK_INT *nk,
+                                       const CCTK_INT *dir,
+                                       const CCTK_INT *bb,
+                                       const CCTK_INT *gsize,
+                                       const CCTK_REAL *delta,
+                                       CCTK_REAL *dvar);
+  DECLARE_CCTK_PARAMETERS
+
+  
+  if (CCTK_GrouplshVN(cctkGH, 3, lsh, var_name) < 0)
+  {
+    CCTK_VWarn(1, __LINE__, __FILE__, CCTK_THORNSTRING,
+               "Error getting local size of grid for variable '%s'",var_name);
+  }
+  if (CCTK_GroupbboxVN(cctkGH, 6, bbox, var_name) < 0)
+  {
+    CCTK_VWarn(1, __LINE__, __FILE__, CCTK_THORNSTRING,
+               "Error getting bounding box for variable '%s'",var_name);
+  }
+  if (CCTK_GroupnghostzonesVN(cctkGH, 3, nghostzones, var_name) < 0)
+  {
+    CCTK_VWarn(1, __LINE__, __FILE__, CCTK_THORNSTRING,
+               "Error getting number of ghostzones for variable '%s'",var_name);
+  }
+
+  ni = lsh[0]; nj = lsh[1]; nk = lsh[2];
+
+  ierr = GetDomainSpecification ( 3, phys_min, phys_max, int_min, int_max,
+                                                  ext_min, ext_max, spacing );
+  
+  switch(dir) {
+  case 0: {
+    delta = spacing[0];
+    bb[0] = bbox[0]; bb[1] = bbox[1];
+    gsize = nghostzones[0];
+    break;
+  }
+  case 1: {
+    delta = spacing[1];
+    bb[0] = bbox[2]; bb[1] = bbox[3];
+    gsize = nghostzones[1];
+    break;
+  }
+  case 2: {
+    delta = spacing[2];
+    bb[0] = bbox[4]; bb[1] = bbox[5];
+    gsize = nghostzones[2];
+    break;
+  }
+  default:
+      assert(0);
+  }
+
+  var = (CCTK_REAL *)(CCTK_VarDataPtr(cctkGH,0,var_name));
+  dvar = (CCTK_REAL *)(CCTK_VarDataPtr(cctkGH,0,dvar_name));
+
+  switch(order) {
+  case 2: {
+    CCTK_FNAME(deriv_gf_2_1)(var,&ni,&nj,&nk,&dir,bb,&gsize,&delta,dvar);
+    break;
+  }
+  case 4: {
+    CCTK_FNAME(deriv_gf_4_2)(var,&ni,&nj,&nk,&dir,bb,&gsize,&delta,dvar);
+    break;
+  }
+  case 6: {
+    CCTK_FNAME(deriv_gf_6_3)(var,&ni,&nj,&nk,&dir,bb,&gsize,&delta,dvar);
+    break;
+  }
+  default:
+    assert(0);
+  }
+}