1 files changed, 49 insertions, 0 deletions
diff --git a/modules/core/c++/descriptor/d2q5.hpp b/modules/core/c++/descriptor/d2q5.hpp
new file mode 100644
index 0000000..fef9c40
--- /dev/null
+++ b/modules/core/c++/descriptor/d2q5.hpp
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "common.hpp"
+
+namespace kel {
+namespace lbm {
+namespace sch {
+using D2Q5 = Descriptor<2u,5u>;
+}
+
+template<typename T>
+class df_info<T,sch::Descriptor<2, 5>> {
+public:
+	using Descriptor = sch::Descriptor<2,5>;
+	
+	static constexpr uint64_t D = 2u;
+	static constexpr uint64_t Q = 5u;
+
+	static constexpr std::array<std::array<int32_t, D>, Q> directions = {{
+		{ 0, 0}, // 0
+		{-1, 0}, // 1
+		{ 1, 0}, // 2
+		{ 0,-1}, // 3
+		{ 0, 1}  // 4
+	}};
+
+	static constexpr std::array<typename saw::native_data_type<T>::type,Q> weights = {
+		1./3.,
+		1./6.,
+		1./6.,
+		1./6.,
+		1./6.
+	};
+
+	static constexpr std::array<uint64_t,Q> opposite_index = {
+		0,
+		2,
+		1,
+		4,
+		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.;
+};
+
+
+}
+}