From 571e79c4d0b72202186fd11314cf268723b1844d Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 23 Mar 2026 17:33:05 +0100
Subject: Fixed boundary setting

---
 examples/poiseulle_particles_2d_psm_gpu/sim.cpp | 25 +++++++++++++++++++++++--
 lib/core/c++/boundary.hpp                       |  5 ++---
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/examples/poiseulle_particles_2d_psm_gpu/sim.cpp b/examples/poiseulle_particles_2d_psm_gpu/sim.cpp
index 0d356dd..7702808 100644
--- a/examples/poiseulle_particles_2d_psm_gpu/sim.cpp
+++ b/examples/poiseulle_particles_2d_psm_gpu/sim.cpp
@@ -83,7 +83,24 @@ saw::error_or<void> setup_initial_conditions(
 		info_f.get_dims(),
 		{{1u,1u}}
 	);
-	
+	// Corners
+	/// Inflow
+	iterator<Desc::D>::apply(
+		[&](auto& index){
+			info_f.at(index).set(5u);
+		},
+		{{0u,0u}},
+		{{1u,dim_y}}
+	);
+	/// Outflow
+	iterator<Desc::D>::apply(
+		[&](auto& index){
+			info_f.at(index).set(5u);
+		},
+		{{dim_x-1u,0u}},
+		{{dim_x, dim_y}}
+	);
+	// Overwrite with
 	// Inflow
 	iterator<Desc::D>::apply(
 		[&](auto& index){
@@ -251,7 +268,11 @@ saw::error_or<void> step(
 					flow_out.apply(fields,index,t_i);
 					// equi.apply(fields,index,t_i);
 					collision.apply(fields,macros,index,t_i);
-				break;
+					break;
+				case 5u:
+					// Corners
+					bb.apply(fields,index,t_i);
+					break;
 				default:
 				break;
 			}
diff --git a/lib/core/c++/boundary.hpp b/lib/core/c++/boundary.hpp
index 217013d..4dbbdf8 100644
--- a/lib/core/c++/boundary.hpp
+++ b/lib/core/c++/boundary.hpp
@@ -174,14 +174,13 @@ class component<FP, Descriptor, cmpt::ZouHeHorizontal<Dir>, Encode> final {
 private:
 	saw::data<FP> rho_setting_;
 public:
-	component(const saw::data<FP>& density_setting__):
-		rho_setting_{density_setting__}
+	component(const saw::data<FP>& rho_setting__):
+		rho_setting_{rho_setting__}
 	{}
 
 	template<typename CellFieldSchema>
 	void apply(const saw::data<CellFieldSchema, Encode>& field, saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> index, saw::data<sch::UInt64> time_step) const {
 		using dfi = df_info<FP,Descriptor>;
-		constexpr int known_dir = Dir ? 1 : -1;
 
 		bool is_even = ((time_step.get() % 2) == 0);
 
-- 
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