From 2dd7c95a111a930e8e23140ab3fec074e7de4c8c Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Fri, 29 May 2026 21:56:48 +0200
Subject: Dangling

---
 lib/core/c++/chunk.hpp             |  1 +
 lib/core/c++/lbm.hpp               |  2 ++
 lib/core/c++/math/math.hpp         |  4 ++++
 lib/core/c++/math/n_closest.hpp    | 24 ++++++++++++++++++++++--
 lib/core/c++/math/round.hpp        | 26 ++++++++++++++++++++++++++
 lib/core/c++/particle/particle.hpp |  2 +-
 6 files changed, 56 insertions(+), 3 deletions(-)
 create mode 100644 lib/core/c++/math/math.hpp
 create mode 100644 lib/core/c++/math/round.hpp

(limited to 'lib/core/c++')

diff --git a/lib/core/c++/chunk.hpp b/lib/core/c++/chunk.hpp
index a1f2451..0f92437 100644
--- a/lib/core/c++/chunk.hpp
+++ b/lib/core/c++/chunk.hpp
@@ -25,6 +25,7 @@ struct chunk_schema_type_helper<Sch, Ghost, saw::tmpl_value_group<uint64_t>, saw
 template<typename Sch, uint64_t Ghost, uint64_t... Sides>
 struct Chunk {
 	using InnerSchema = typename impl::chunk_schema_type_helper<Sch, Ghost, saw::tmpl_value_group<uint64_t,Sides...>>::Schema;
+	using StoredValueSchema = Sch;
 };
 
 // Not needed for now
diff --git a/lib/core/c++/lbm.hpp b/lib/core/c++/lbm.hpp
index fbad908..b34ec10 100644
--- a/lib/core/c++/lbm.hpp
+++ b/lib/core/c++/lbm.hpp
@@ -23,6 +23,8 @@
 #include "write_vtk.hpp"
 #include "util.hpp"
 
+#include "math/math.hpp"
+
 #include <forstio/codec/unit/unit_print.hpp>
 #include <iostream>
 
diff --git a/lib/core/c++/math/math.hpp b/lib/core/c++/math/math.hpp
new file mode 100644
index 0000000..3920bec
--- /dev/null
+++ b/lib/core/c++/math/math.hpp
@@ -0,0 +1,4 @@
+#pragma once
+
+#include "n_linear.hpp"
+#include "n_closest.hpp"
diff --git a/lib/core/c++/math/n_closest.hpp b/lib/core/c++/math/n_closest.hpp
index ddc89be..13414e2 100644
--- a/lib/core/c++/math/n_closest.hpp
+++ b/lib/core/c++/math/n_closest.hpp
@@ -6,8 +6,8 @@
 namespace kel {
 namespace lbm {
 
-template<typename FieldSchema, typename T, uint64_t D>
-auto n_closest_read(saw::data<FieldSchema>, const saw::data<sch::Vector<T,D>>& frac_ind){
+template<typename FieldSchema, typename Encode, typename T, uint64_t D>
+saw::data<typename FieldSchema::InnerValueSchema> n_closest_read(const saw::data<sch::Ptr<FieldSchema>,Encode>& f, const saw::data<sch::Vector<T,D>>& frac_ind){
 
 	auto shift_frac_ind = frac_ind;
 	for(uint64_t i{0u}; i < D; ++i){
@@ -19,6 +19,26 @@ auto n_closest_read(saw::data<FieldSchema>, const saw::data<sch::Vector<T,D>>& f
 	}
 
 	auto shift_ind = frac_ind.template cast_to<sch::UInt64>();
+
+	return f.at(shift_ind);
 }
+
+template<typename FieldSchema, typename Encode, typename T, uint64_t D>
+void n_closest_add(saw::data<sch::Ptr<FieldSchema>,Encode>& f, const saw::data<sch::Vector<T,D>>& frac_ind, const saw::data<typename FieldSchema::InnerValueSchema>& val){
+	auto shift_frac_ind = frac_ind;
+	for(uint64_t i{0u}; i < D; ++i){
+		
+		shift_frac_ind.at({{i}}) = shift_frac_ind.at({{i}})  + saw::data<T>{0.5};
+		if(shift_frac_ind.at({{i}}).get() < 0){
+			shift_frac_ind.at({{i}}) = {};
+		}
+	}
+
+	auto shift_ind = frac_ind.template cast_to<sch::UInt64>();
+	auto& f_i = f.at(shift_ind);
+
+	f_i = f_i + val;
+}
+
 }
 }
diff --git a/lib/core/c++/math/round.hpp b/lib/core/c++/math/round.hpp
new file mode 100644
index 0000000..d3a2586
--- /dev/null
+++ b/lib/core/c++/math/round.hpp
@@ -0,0 +1,26 @@
+#pragma once
+
+#include "../common.hpp"
+
+namespace kel {
+namespace lbm {
+
+template<typename T, uint64_t D>
+saw::data<sch::FixedArray<sch::UInt64,D>> round_to_unsigned(const saw::data<sch::Vector<T,D>>& inp){
+	saw::data<sch::FixedArray<sch::UInt64,D>> rv;
+				
+	auto zero = static_cast<saw::native_data_type<T>::type>(0);
+	auto half = static_cast<saw::native_data_type<T>::type>(0.5);
+
+	for(uint64_t i{0u}; i < D; ++i){
+		auto val = inp.at({{i}}).get()+half;
+		val = std::max(zero,val);
+
+		rv.at({i}).set(static_cast<uint64_t>(val));
+	}
+
+	return rv;
+}
+
+}
+}
diff --git a/lib/core/c++/particle/particle.hpp b/lib/core/c++/particle/particle.hpp
index 37bdc28..fec2eca 100644
--- a/lib/core/c++/particle/particle.hpp
+++ b/lib/core/c++/particle/particle.hpp
@@ -91,7 +91,7 @@ saw::data<sch::ParticleGroup<T,D, sch::ParticleCollisionSpheroid<T,radius>>> cre
 	mask = {mask_dims};
 
 	auto& mask_step = part.template get<"mask_step">().at({{0u}});
-	mask_step.at({}) = dia_d.at({}) / mask_resolution.template cast_to<T>();
+	mask_step.at({}) = dia_d / mask_resolution.template cast_to<T>();
 
 	auto& com = part.template get<"center_of_mass">().at({{0u}});
 	// Paranoia
-- 
cgit v1.2.3