Added a new function for the legacy Astaroth layer: acGetNode(). This functions returns a Node, which can be used to access acNode layer functions

include/astaroth.h

@@ -99,6 +99,8 @@ AcResult acLoadWithOffset(const AcMesh host_mesh, const int3 src, const int num_
 /** */
 int acGetNumDevicesPerNode(void);
 
+Node acGetNode(void);
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

src/core/astaroth.cc

@@ -34,8 +34,10 @@ const char* scalararray_names[] = {AC_FOR_SCALARARRAY_HANDLES(AC_GEN_STR)};
 const char* vtxbuf_names[]      = {AC_FOR_VTXBUF_HANDLES(AC_GEN_STR)};
 #undef AC_GEN_STR
 
-static const int num_nodes = 1;
-static Node nodes[num_nodes];
+static const int max_num_nodes   = 1;
+static Node nodes[max_num_nodes] = {0};
+
+static int num_nodes = 0;
 
 void
 acPrintMeshInfo(const AcMeshInfo config)
@@ -55,12 +57,14 @@ acPrintMeshInfo(const AcMeshInfo config)
 AcResult
 acInit(const AcMeshInfo mesh_info)
 {
+    num_nodes = 1;
     return acNodeCreate(0, mesh_info, &nodes[0]);
 }
 
 AcResult
 acQuit(void)
 {
+    num_nodes = 0;
     return acNodeDestroy(nodes[0]);
 }
 
@@ -176,3 +180,10 @@ acGetNumDevicesPerNode(void)
     ERRCHK_CUDA_ALWAYS(cudaGetDeviceCount(&num_devices));
     return num_devices;
 }
+
+Node
+acGetNode(void)
+{
+    ERRCHK_ALWAYS(num_nodes > 0);
+    return nodes[0];
+}