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/bouzidi.h | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 tangle/LLBM/kernel/bouzidi.h

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

diff --git a/tangle/LLBM/kernel/bouzidi.h b/tangle/LLBM/kernel/bouzidi.h
new file mode 100644
index 0000000..b1abd2c
--- /dev/null
+++ b/tangle/LLBM/kernel/bouzidi.h
@@ -0,0 +1,39 @@
+#pragma once
+#include <LLBM/call_tag.h>
+#include <LLBM/lattice.h>
+
+template <typename S>
+struct BouzidiConfig {
+  std::size_t* boundary; // boundary cell to be interpolated
+  std::size_t* solid;    // adjacent solid cell
+  std::size_t* fluid;    // adjacent fluid cell
+  S* distance;           // precomputed distance factor q
+  S* correction;         // correction for moving walls
+  pop_index_t* missing;  // population to be reconstructed
+};
+
+struct BouzidiO {
+
+using call_tag = tag::call_by_list_index;
+
+template <typename T, typename S, typename DESCRIPTOR>
+__device__ static void apply(
+    LatticeView<DESCRIPTOR,S> lattice
+  , std::size_t index
+  , std::size_t count
+  , BouzidiConfig<S> config
+) {
+  pop_index_t& iPop = config.missing[index];
+  pop_index_t  jPop = descriptor::opposite<DESCRIPTOR>(iPop);
+  pop_index_t  kPop = config.boundary[index] == config.fluid[index] ? iPop : jPop;
+
+  S f_bound_j = *lattice.pop(jPop, config.boundary[index]);
+  S f_fluid_j = *lattice.pop(kPop, config.fluid[index]);
+  S* f_next_i =  lattice.pop(iPop, config.solid[index]);
+
+  *f_next_i = config.distance[index] * f_bound_j
+            + (1. - config.distance[index]) * f_fluid_j
+            + config.correction[index];
+}
+
+};
-- 
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