Added an example for creating arbitrary projects, see acc/test_solver and src/exampleproject. Note: make sure that dt is calculated adequately and that all parameters are defined properly (see src/exampleproject/simulation.cc)

acc/test_solver/stencil_assembly.sas

@@ -0,0 +1,36 @@
+#include "stencil_definition.sdh"
+
+
+//JP NOTE IMPORTANT/////////////////////////////////////////////////////////////////////////////////
+// These functions are defined here temporarily.
+//
+// Currently the built-in functions (derx, derxx etc) are defined in CUDA in integrate.cuh.
+// This is bad. Instead the built-in functions should be defined in the DSL, and be "includable"
+// as a standard DSL library, analogous to f.ex. stdlib.h in C.
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+
+Preprocessed Scalar
+value(in ScalarField vertex)
+{
+    return vertex[vertexIdx];
+}
+
+Preprocessed Vector
+gradient(in ScalarField vertex)
+{
+    return (Vector){derx(vertexIdx, vertex), dery(vertexIdx, vertex), derz(vertexIdx, vertex)};
+}
+
+Preprocessed Matrix
+hessian(in ScalarField vertex)
+{
+    Matrix hessian;
+
+    hessian.row[0] = (Vector){derxx(vertexIdx, vertex), derxy(vertexIdx, vertex),
+                              derxz(vertexIdx, vertex)};
+    hessian.row[1] = (Vector){hessian.row[0].y, deryy(vertexIdx, vertex), deryz(vertexIdx, vertex)};
+    hessian.row[2] = (Vector){hessian.row[0].z, hessian.row[1].z, derzz(vertexIdx, vertex)};
+
+    return hessian;
+}

acc/test_solver/stencil_definition.sdh

@@ -0,0 +1,18 @@
+//JP NOTE IMPORTANT/////////////////////////////////////////////////////////////////////////////////
+// AC_dsx etc are defined here temporarily (otherwise does not compile).
+//
+// These should ultimately be defined in the standard DSL libraries.
+// See test_solver/stencil_assembly.sas for more info.
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+uniform Scalar AC_dsx;// TODO include these from the std lib
+uniform Scalar AC_dsy;
+uniform Scalar AC_dsz;
+uniform Scalar AC_inv_dsx;
+uniform Scalar AC_inv_dsy;
+uniform Scalar AC_inv_dsz;
+uniform Scalar AC_dt;
+
+uniform ScalarField VTXBUF_A;
+uniform ScalarField VTXBUF_B;
+uniform ScalarField VTXBUF_C;

acc/test_solver/stencil_process.sps

@@ -0,0 +1,18 @@
+#include "stencil_definition.sdh"
+
+Vector
+value(in VectorField uu)
+{
+    return (Vector){value(uu.x), value(uu.y), value(uu.z)};
+}
+
+in VectorField uu(VTXBUF_A, VTXBUF_B, VTXBUF_C);
+out VectorField out_uu(VTXBUF_A, VTXBUF_B, VTXBUF_C);
+
+Kernel void
+solve()
+{
+    Scalar dt = AC_dt;
+    Vector rate_of_change = (Vector){1, 2, 3};
+    out_uu = rk3(out_uu, uu, rate_of_change, dt);
+}