From eb97ceef955fa1c5e3794c74fc9894fda1ce6f21 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Tue, 2 Jun 2026 18:15:13 +0200
Subject: Doing aabb computations

---
 lib/core/c++/particle/aabb.hpp | 49 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 lib/core/c++/particle/aabb.hpp

(limited to 'lib/core/c++/particle/aabb.hpp')

diff --git a/lib/core/c++/particle/aabb.hpp b/lib/core/c++/particle/aabb.hpp
new file mode 100644
index 0000000..aec95ca
--- /dev/null
+++ b/lib/core/c++/particle/aabb.hpp
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "particle.hpp"
+
+namespace kel {
+namespace lbm {
+template<typename T, uint64_t D, typename PColl>
+class particle_aabb final {
+};
+
+template<typename T, uint64_t D, typename saw::native_data_type<T>::type radius>
+class particle_aabb<ParticleGroup<T,D,sch::ParticleCollisionSpheroid<T,radius> > > final {
+public:
+	using Schema = sch::ParticleGroup<T,D,sch::ParticleCollisionSpheroid<T,radius>>;
+
+	using AABB = Struct<
+		Member<sch::FixedArray<sch::UInt64,D>"a">,
+		Member<sch::FixedArray<sch::UInt64,D>"b">
+	>;
+public:
+	static constexpr saw::data<AABB> get(const saw::data<Schema>& p_grp, const saw::data<sch::FixedArray<sch::UInt64,1u>>& i, const saw::data<sch::FixedArray<sch::UInt64,D>>& meta){
+		auto& parts = p_grp.template get<"particles">();
+
+		auto& pi = parts.at(i);
+		auto& pirb = pi.template get<"rigid_body">();
+		auto& pirb_pos = pirb.template get<"position">();
+
+		saw::data<AABB> aabb;
+		auto& a = aabb.template get<"a">();
+		auto& b = aabb.template get<"b">();
+
+		saw::data<sch::Scalar<T>> rad_d;
+		rad_d.at({}).set(radius);
+
+		saw::data<sch::Vector<T,D>> lower;
+		saw::data<sch::Vector<T,D>> upper;
+
+		for(uint64_t i{0u}; i < D; ++i){
+			lower.at({{i}}) = pirb_pos.at({{i}}) >= rad_d.at({}) ? (pirb_pos.at({{i}}) - rad_d.at({})) : saw::data<T>{0};
+			a.at({i}) = lower.at({{i}}).template cast_to<sch::UInt64>();
+			upper.at({{i}}) = pirb_pos.at({{i}}) + rad_d.at({});
+			b.at({i}) = (upper.at({{i}})+saw::data<T>{1}).template cast_to<sch::UInt64>()
+		}
+		
+		return aabb;
+	}
+};
+}
+}
-- 
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