From 8be0ee7f948c52c1e71e2437bf6e15800daca47d Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 2 Mar 2026 21:11:15 +0100
Subject: Dangling

---
 examples/poiseulle_particles_2d_gpu/sim.cpp | 43 ++++++++++-------------------
 lib/core/c++/particle/geometry/circle.hpp   | 33 +++++++++++++++++-----
 2 files changed, 41 insertions(+), 35 deletions(-)

diff --git a/examples/poiseulle_particles_2d_gpu/sim.cpp b/examples/poiseulle_particles_2d_gpu/sim.cpp
index 0f7c97b..4bc9dfb 100644
--- a/examples/poiseulle_particles_2d_gpu/sim.cpp
+++ b/examples/poiseulle_particles_2d_gpu/sim.cpp
@@ -220,9 +220,9 @@ saw::error_or<void> step(
 			[&](){
 				uint64_t target_t_i = 64u;
 				if(t_i.get() < target_t_i){
-					return 1.0 + (0.015 / target_t_i) * t_i.get();
+					return 1.0 + (0.0015 / target_t_i) * t_i.get();
 				}
-				return 1.015;
+				return 1.0015;
 			}()
 		};
 		component<T,Desc,cmpt::ZouHeHorizontal<false>,encode::Sycl<saw::encode::Native>> flow_out{1.0};
@@ -240,10 +240,16 @@ saw::error_or<void> step(
 				case 0u:
 				break;
 				case 1u:
-					// bb.apply(fields,index,t_i);
+					bb.apply(fields,index,t_i);
 				break;
 				case 2u:
+					flow_in.apply(fields,index,t_i);
+					collision.apply(fields,macros,index,t_i);
+					break;
 				case 3u:
+					flow_out.apply(fields,index,t_i);
+					collision.apply(fields,macros,index,t_i);
+					break;
 				case 4u:
 					collision.apply(fields,macros,index,t_i);
 				break;
@@ -270,24 +276,6 @@ saw::error_or<void> step(
 		});
 	}).wait();
 	
-	q.submit([&](acpp::sycl::handler& h){
-		h.parallel_for(acpp::sycl::range<Desc::D>{dim_x,dim_y}, [=](acpp::sycl::id<Desc::D> idx){
-			switch(info.get()){
-				case 1u:
-					bb.apply(fields,index,t_i);
-				break;
-				case 3u:
-					// equi.apply(fields,index,t_i);
-					flow_in.apply(fields,index,t_i);
-				break;
-				case 4u:
-					// equi.apply(fields,index,t_i);
-					flow_out.apply(fields,index,t_i);
-				break;
-			}
-		});
-	}).wait();
-
 	// Step
 	/*
 	q.submit([&](acpp::sycl::handler& h){
@@ -395,6 +383,12 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 	saw::data<sch::UInt64> time_steps{4096ul};
 
 	for(saw::data<sch::UInt64> i{0u}; i < time_steps and krun; ++i){
+		{
+			auto eov = dev.copy_to_host(lbm_sycl_macro_data,*lbm_macro_data_ptr);
+			if(eov.is_error()){
+				return eov;
+			}
+		}
 		{
 			{
 				auto eov = write_vtk_file(out_dir,"t",i.get(), *lbm_macro_data_ptr);
@@ -409,13 +403,6 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 				return eov;
 			}
 		}
-		{
-			auto eov = dev.copy_to_host(lbm_sycl_macro_data,*lbm_macro_data_ptr);
-			if(eov.is_error()){
-				return eov;
-			}
-		}
-
 		wait.poll();
 		if(print_status){
 			std::cout<<"Status: "<<i.get()<<" of "<<time_steps.get()<<" - "<<(i.template cast_to<sch::Float64>().get() * 100 / time_steps.get())<<"%"<<std::endl;
diff --git a/lib/core/c++/particle/geometry/circle.hpp b/lib/core/c++/particle/geometry/circle.hpp
index 331f06d..cf9b87e 100644
--- a/lib/core/c++/particle/geometry/circle.hpp
+++ b/lib/core/c++/particle/geometry/circle.hpp
@@ -5,7 +5,7 @@
 namespace kel {
 namespace lbm {
 
-template<typename T>
+template<typename T, uint64_t D>
 class particle_circle_geometry {
 private:
 public:
@@ -13,8 +13,8 @@ public:
 	{}
 
 	template<typename MT = T>
-	saw::data<sch::ParticleMask<MT,2>> generate_mask(uint64_t resolution, uint64_t boundary_nodes = 0) const {
-		saw::data<sch::ParticleMask<MT,2>> mask;
+	saw::data<sch::ParticleMask<MT,D>> generate_mask(uint64_t resolution, uint64_t boundary_nodes = 0) const {
+		saw::data<sch::ParticleMask<MT,D>> mask;
 
 		auto& grid = mask.template get<"grid">();
 		auto& com = mask.template get<"center_of_mass">();
@@ -28,6 +28,24 @@ public:
 		saw::data<T> delta_x{static_cast<typename saw::native_data_type<T>::type>(2.0  / static_cast<double>(diameter_i))};
 		saw::data<T> center = (saw::data<T>{1.0} + saw::data<T>{2.0} * saw::data<T>{static_cast<saw::native_data_type<T>::type>(boundary_nodes)/diameter_i});
 
+		saw::data<sch::FixedArray<sch::UInt64,D>> boundary_arr;
+		for(uint64_t i = 0u; i < D; ++i){
+			boundary_arr.set(boundary_nodes);
+		}
+
+		iterator<D>::apply([&](const auto& index){
+			grid.at(index).set(0);
+		}, {}, grid.dims());
+		
+		iterator<D>::apply([&](const auto& index){
+			saw::data<sch::Vector<T,D>> f_ind;
+			for(uint64_t i = 0u; i < D; ++i){
+				f_ind.at({{i}}) = (index.at({{i}}) + 0.5) * delta_x - center;
+			}
+
+			auto norm_f_ind = saw::math::norm(f_ind);
+		}, {}, grid.dims(),boundary_arr);
+
 		for(uint64_t i = 0; i < size; ++i){
 			for(uint64_t j = 0; j < size; ++j){
 				grid.at({{i,j}}).set(0);
@@ -43,18 +61,19 @@ public:
 			}
 		}
 
+		// I don't fully remember what this did
 		saw::data<T> total_mass{};
-		iterate_over([&](const saw::data<sch::FixedArray<sch::UInt64,2u>>& index){
+		iterator::apply<D>::apply([&](const saw::data<sch::FixedArray<sch::UInt64,D>>& index){
 			auto ind_vec = saw::math::vectorize_data(index).template cast_to<T>();
-			for(uint64_t i{0u}; i < 2u; ++i){
+			for(uint64_t i{0u}; i < D; ++i){
 				ind_vec.at({{i}}) = ind_vec.at({{i}}) * grid.at(index);
 			}
 			com = com + ind_vec;
 
 			total_mass = total_mass + grid.at(index);
-		},{{0u,0u}}, grid.dims());
+		},{}, grid.dims());
 
-		for(uint64_t i{0u}; i < 2u; ++i){
+		for(uint64_t i{0u}; i < D; ++i){
 			com.at({{i}}) = com.at({{i}}) / total_mass;
 		}
 
-- 
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