From 0786c15aa982d37d12ff9fdc40c02c8b0a65c917 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Tue, 29 Apr 2025 17:36:16 +0200
Subject: wip dangling changes

---
 c++/particle/particle.hpp | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

(limited to 'c++/particle/particle.hpp')

diff --git a/c++/particle/particle.hpp b/c++/particle/particle.hpp
index f893b9b..d253e64 100644
--- a/c++/particle/particle.hpp
+++ b/c++/particle/particle.hpp
@@ -10,10 +10,12 @@ using namespace saw::schema;
 template<typename T, uint64_t D>
 using ParticleRigidBody = Struct<
 	Member<FixedArray<T,D>, "position">,
-	Member<FixedArray<T,D>, "velocity">,
+	Member<FixedArray<T,D>, "position_old">,
+	Member<FixedArray<T,D>, "rotation">,
+	Member<FixedArray<T,D>, "rotation_old">,
+
 	Member<FixedArray<T,D>, "acceleration">,
-	Member<FixedArray<T,D>, "rotate_velocity">,
-	Member<FixedArray<T,D>, "rotate_acceleration">
+	Member<FixedArray<T,D>, "rotational_acceleration">
 >;
 
 template<typename T, uint64_t D>
@@ -32,6 +34,27 @@ template<typename T, uint64_t D, typename Particle>
 class particle_system {
 private:
 	saw::data<sch::Array<Particle, D>> particles_;
+
+	void verlet_step(saw::data<sch::Particle<T,D>& particle, saw::data<T> time_step_delta){
+		auto& body = particle.template get<"rigid_body">();
+
+		auto& pos = body.template get<"position">();
+		auto& pos_old = body.template get<"position_old">();
+
+		auto& rot = body.template get<"rotation">();
+		auto& acc = body.template get<"acceleration">();
+
+		auto tsd_squared = time_step_delta * time_step_delta;
+
+		saw::data<sch::FixedArray<T,D>> pos_new;
+		// Actual step
+		for(uint64_t i = 0u; i < D; ++i){
+			pos_new.at({i}) = saw::data<T>{2.0} * pos.at({i}) - pos_old.at({i}) + acc.at({i}) * tsd_squared;
+		}
+
+		pos_old = pos;
+		pos = pos_new;
+	}
 public:
 
 	void step(T time_step_delta){
@@ -41,9 +64,8 @@ public:
 	}
 
 	template<typename LbmLattice>
-	void update_mask(saw::data<LbmLattice>& latt){
+	void update_particle_border(saw::data<LbmLattice>& latt){
 		for(auto& iter : particles_){
-
 		}
 	}
 };
-- 
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