From 4ec94c97879aafef15f7663135745e4ba61e62cf Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 17 May 2021 00:15:33 +0200
Subject: Extract first public LiterateLB version

---
 tangle/LLBM/kernel/propagate.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 tangle/LLBM/kernel/propagate.h

(limited to 'tangle/LLBM/kernel/propagate.h')

diff --git a/tangle/LLBM/kernel/propagate.h b/tangle/LLBM/kernel/propagate.h
new file mode 100644
index 0000000..08f78ea
--- /dev/null
+++ b/tangle/LLBM/kernel/propagate.h
@@ -0,0 +1,20 @@
+#pragma once
+
+template <typename DESCRIPTOR, typename S>
+class LatticeView;
+
+template <typename DESCRIPTOR, typename S>
+__global__ void propagate(LatticeView<DESCRIPTOR,S> lattice, S** base, std::size_t size) {
+
+  for (unsigned iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+    std::ptrdiff_t shift = -descriptor::offset<DESCRIPTOR>(lattice.cuboid, iPop);
+
+    lattice.population[iPop] += shift;
+
+    if (lattice.population[iPop] < base[iPop]) {
+      lattice.population[iPop] += size;
+    } else if (lattice.population[iPop] + size > base[iPop] + 2*size) {
+      lattice.population[iPop] -= size;
+    }
+  }
+}
-- 
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