From c0549d71b2109f10c1238db8b22362e7826ba61b Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sun, 5 Jul 2026 15:59:23 +0200
Subject: Just rename from lib to modules

---
 modules/core/c++/macroscopic.hpp | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 modules/core/c++/macroscopic.hpp

(limited to 'modules/core/c++/macroscopic.hpp')

diff --git a/modules/core/c++/macroscopic.hpp b/modules/core/c++/macroscopic.hpp
new file mode 100644
index 0000000..19ab3e9
--- /dev/null
+++ b/modules/core/c++/macroscopic.hpp
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "descriptor.hpp"
+
+namespace kel {
+namespace lbm {
+/**
+ * Calculate the macroscopic variables rho and u in Lattice Units.
+ */
+template<typename T, typename Desc>
+void compute_rho_u (
+		const saw::data<sch::FixedArray<T,Desc::Q>>& dfs,
+		saw::ref<saw::data<sch::Scalar<T>>> rho,
+		saw::ref<saw::data<sch::Vector<T,Desc::D>>> vel
+	)
+{
+	using dfi = df_info<T, Desc>;
+
+	rho().at({}).set(0);
+	for(uint64_t i = 0; i < Desc::D; ++i){
+		vel().at({{i}}).set(0);
+	}
+
+	for(size_t j = 0; j < Desc::Q; ++j){
+		rho().at({}) = rho().at({}) + dfs.at({j});
+		for(size_t i = 0; i < Desc::D; ++i){
+			vel().at({{i}}) = vel().at({{i}}) + saw::data<T>{static_cast<typename saw::native_data_type<T>::type>(dfi::directions[j][i])} * dfs.at({j});
+		}
+	}
+
+	for(size_t i = 0; i < Desc::D; ++i){
+		vel().at({{i}}) = vel().at({{i}}) / rho().at({});
+	}
+}
+}
+}
-- 
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