From ba9c23e4177ab9309f69155601578b118b2fd782 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Wed, 4 Feb 2026 16:28:48 +0100
Subject: Weird missing vtk writes

---
 lib/core/c++/stream.hpp | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

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

diff --git a/lib/core/c++/stream.hpp b/lib/core/c++/stream.hpp
index 8c0342b..dc7cfb3 100644
--- a/lib/core/c++/stream.hpp
+++ b/lib/core/c++/stream.hpp
@@ -17,19 +17,44 @@ public:
 	static constexpr saw::string_literal before = "";
 
 	template<typename CellFieldSchema>
-	void apply(const saw::data<CellFieldSchema, Encode>& field, const saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>>& index, saw::data<sch::UInt64> time_step) const {
+	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<T,Descriptor>;
+		auto g_index = index;
+
+		for(uint64_t i = 0u; i < Descriptor::D; ++i){
+			++g_index.at({{i}});
+		}
+
 		bool is_even = ((time_step.get() % 2) == 0);
 
 		auto& dfs_old_f = (is_even) ? field.template get<"dfs_old">() : field.template get<"dfs">();
+		auto& dfs_new_f = (is_even) ? field.template get<"dfs">() : field.template get<"dfs_old">();
 		auto info_f = field.template get<"info">();
 
 		auto info_meta = info_f.get_dims();
 
+		/*
 		bool border = false;
 		for(uint64_t i = 0u; i < Descriptor::D; ++i){
 			auto ind_i = index.at({i});
 			border |= (ind_i.get()) == 0u or (ind_i == info_meta.at({i}));
 		}
+
+		if (not border){
+		}
+		*/
+
+		auto& dfs_new = dfs_new_f.ghost_at(g_index);
+
+		for(uint64_t i = 0u; i < Descriptor::Q; ++i){
+			auto dir = dfi::directions[dfi::opposite_index[i]];
+			auto g_index_nb = g_index;
+			for(uint64_t z = 0u; z < Descriptor::D; ++z){
+				g_index_nb.at({z}).set(g_index.at({z}).get() + dir[z]);
+			}
+
+			dfs_new.at({i}) = dfs_old_f.ghost_at(g_index_nb).at({i});
+		}
 	}
 };
 }
-- 
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