From 971250070e7b27590d215de54116f3990ab8ff5a Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 2 Mar 2026 21:10:46 +0100
Subject: Adding bluring for masks

---
 lib/core/c++/math/n_linear.hpp | 29 +++++++++++++++++++++++++++++
 lib/core/c++/particle/blur.hpp | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 lib/core/c++/math/n_linear.hpp
 create mode 100644 lib/core/c++/particle/blur.hpp

(limited to 'lib/core')

diff --git a/lib/core/c++/math/n_linear.hpp b/lib/core/c++/math/n_linear.hpp
new file mode 100644
index 0000000..62906cd
--- /dev/null
+++ b/lib/core/c++/math/n_linear.hpp
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "../common.hpp"
+
+namespace kel {
+namespace lbm {
+
+template<typename FieldSchema, typename T, uint64_t D>
+void n_linear_interpolate(const saw::data<FieldSchema>& field, const saw::data<sch::FixedArray<T,D>>& pos){
+
+	auto pos_bound = pos;
+	auto meta = field.dims();
+	saw::data<sch::UInt64> ind;
+	for(saw::data<sch::UInt64> i{0u}; i < saw::data<sch::UInt64>{D}; ++i){
+		pos_bound.at(i).set(
+			std::max(
+				std::min(
+					meta.at(i).template cast_to<T>().get(),
+					pos.at(i).get() + 1.5
+				),
+				1,
+			)
+			-1
+		);
+		ind.at(i) = pos_bound.at(i).template cast_to<sch::UInt64>();
+	}
+}
+}
+}
diff --git a/lib/core/c++/particle/blur.hpp b/lib/core/c++/particle/blur.hpp
new file mode 100644
index 0000000..a304e8d
--- /dev/null
+++ b/lib/core/c++/particle/blur.hpp
@@ -0,0 +1,37 @@
+#pragma once
+
+namespace kel {
+namespace lbm {
+template<typename T, uint64_t D>
+void blur_mask(saw::data<sch::Array<T,D>>& p_mask){
+
+	saw::data<T> mid{2.0/3.0};
+	saw::data<T> edge{1.0/6.0};
+
+	// saw::data<sch::FixedArray<sch::UInt64>,2u> blur_weights{{2.0/3.0},{1.0/6.0}};
+
+	auto meta = p_mask.dims();
+	saw::data<sch::Array<T,D>> blurred_mask{meta};
+
+	for(saw::data<sch::UInt64> i{0u}; i < saw::data<sch::UInt64>{D}; ++i){
+		iterator<D>::apply([&](const auto& index){
+			blurred_mask.at(index) = p_mask.at(index) * mid;
+
+			if(index.at({i}).get() > 0u){
+				auto l_ind = index;
+				l_ind.at({i}) = ind.at({i}) - 1u;
+				blurred_mask.at(index) = blurred_mask.at(index) + p_mask.at(l_ind) * edge;
+			}
+			if((index.at({i}).get() + 1u) < meta.at({i})){
+				auto r_ind = index;
+				r_ind.at({i}) = ind.at({i}) + 1u;
+				blurred_mask.at(index) = blurred_mask.at(index) + p_mask.at(r_ind) * edge;
+			}
+		},{},meta);
+
+		p_mask = blurred_mask;
+	}
+
+}
+}
+}
-- 
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