From 4963e6a6f1d1c1f0482e143268a2053ed26cc047 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 17 Aug 2026 09:08:01 +0200
Subject: Thinking how to do it

---
 modules/core/c++/descriptor/d2q4.hpp | 48 ++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 modules/core/c++/descriptor/d2q4.hpp

(limited to 'modules/core')

diff --git a/modules/core/c++/descriptor/d2q4.hpp b/modules/core/c++/descriptor/d2q4.hpp
new file mode 100644
index 0000000..e867bbc
--- /dev/null
+++ b/modules/core/c++/descriptor/d2q4.hpp
@@ -0,0 +1,48 @@
+#pragma once
+
+#include "common.hpp"
+
+namespace kel {
+namespace lbm {
+namespace sch {
+using D2Q5 = Descriptor<2u,4u>;
+}
+
+template<typename T>
+class df_info<T,sch::Descriptor<2, 4>> {
+public:
+	using Descriptor = sch::Descriptor<2,4>;
+	
+	static constexpr uint64_t D = 2u;
+	static constexpr uint64_t Q = 4u;
+
+	static constexpr std::array<std::array<int32_t, D>, Q> directions = {{
+		{ 0, 0}, // 0
+		{-1, 0}, // 1
+		{ 1, 0}, // 2
+		{ 0,-1}, // 3
+	}};
+
+	static constexpr std::array<typename saw::native_data_type<T>::type,Q> weights = {
+		1./3.,
+		1./6.,
+		1./6.,
+		1./6.
+	};
+
+	/*
+	static constexpr std::array<uint64_t,Q> opposite_index = {
+		0,
+		2,
+		1,
+		3
+	};
+	*/
+	
+	static constexpr typename saw::native_data_type<T>::type inv_cs2 = 3.0;
+	static constexpr typename saw::native_data_type<T>::type cs2 = 1./3.;
+};
+
+
+}
+}
-- 
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