From 6fa5e2f97c215a0c56679514af74e88f81200d47 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Tue, 28 Jul 2026 20:28:48 +0200
Subject: Fixing up fplbm

---
 modules/core/c++/fplbm.hpp | 76 ++++++++--------------------------------------
 1 file changed, 13 insertions(+), 63 deletions(-)

diff --git a/modules/core/c++/fplbm.hpp b/modules/core/c++/fplbm.hpp
index 34806aa..31b66c4 100644
--- a/modules/core/c++/fplbm.hpp
+++ b/modules/core/c++/fplbm.hpp
@@ -114,8 +114,8 @@ private:
 public:
 	component() = default;
 
-	template<typename CellFieldSchema, typename MacroFieldSchema>
-	void apply(const saw::data<CellFieldSchema, Encode>& field, const saw::data<MacroFieldSchema,Encode>& macros, saw::data<sch::FixedArray<sch::UInt64,Descriptor::D>> index, saw::data<sch::UInt64> time_step) const {
+	template<typename CellFieldSchema, typename MacroFieldSchema, typename ParticleSchema>
+	void apply(const saw::data<CellFieldSchema, Encode>& field, const saw::data<MacroFieldSchema,Encode>& macros, const saw::data<ParticleSchema,Encode>& pg, saw::data<sch::FixedArray<sch::UInt64,1u>> index, saw::data<sch::UInt64> time_step, saw::data<sch::UInt64> sub_steps) const {
 	// void apply(saw::data<CellFieldSchema, Encode>& field, saw::data<sch::FixedArray<sch::UInt64, Descriptor::D>> index, saw::data<sch::UInt64> time_step){
 		bool is_even = ((time_step.get() % 2) == 0);
 
@@ -129,76 +129,26 @@ public:
 		// Temporary find a better way
 		auto& force_f = macros.template get<"force">();
 
-
 		/**
 		 * The other methods all work with a flipped porosity.
 		 * For compat reasons this is also flipped
 		 */
-		auto porosity = por_f.at(index);
-		saw::data<sch::Scalar<T>> one;
-		one.at({}) = 1.0;
-		auto flip_porosity = one - porosity;
-
-		saw::data<sch::Scalar<T>>& rho = rho_f.at(index);
-
-		saw::data<sch::Scalar<T>> half;
-		half.at({}).set(0.5);
-		saw::data<sch::Vector<T,Descriptor::D>>& vel = vel_f.at(index);// + total_force * ( half / rho );
-
-		compute_rho_u<T,Descriptor>(dfs_old_f.at(index),rho,vel);
-		auto eq = equilibrium<T,Descriptor>(rho,vel);
-
-		using dfi = df_info<T,Descriptor>;
-
-		saw::data<sch::Scalar<T>> min_two;
-		min_two.at({}).set(-2);
-
-		// Maybe ? 
-		auto& force = force_f.at(index);
-		force = vel * rho * min_two * flip_porosity;
-
-		saw::data<sch::Scalar<T>> dfi_inv_cs2;
-		dfi_inv_cs2.at({}).set(dfi::inv_cs2);
-
-		// auto vel = vel_f.at(index);
-
-		for(uint64_t i = 0u; i < Descriptor::Q; ++i){
-			// saw::data<T> ci_min_u{0};
-			saw::data<sch::Vector<T,Descriptor::D>> ci;
-			for(uint64_t d = 0u; d < Descriptor::D; ++d){
-				ci.at({{d}}).set(static_cast<typename saw::native_data_type<T>::type>(dfi::directions[i][d]));
-			}
-			auto ci_dot_u = saw::math::dot(ci,vel);
-
-			// saw::data<sch::Vector<T,Descriptor::D>> F_i;
-			// F_i = f * ((c_i - u) * ics2  + <c_i,u> * c_i * ics2 * ics2) * w_i;
-			saw::data<sch::Scalar<T>> w;
-			w.at({}).set(dfi::weights[i]);
-
-			/*
-			saw::data<sch::Scalar<T>> F_i_sum;
-			for(uint64_t d = 0u; d < Descriptor::D; ++d){
-				saw::data<sch::Scalar<T>> F_i_d;
-				F_i_d.at({}) = F_i.at({{d}});
-				F_i_sum = F_i_sum + F_i_d;
-			}
-			*/
-			auto term1 = (ci-vel) * dfi_inv_cs2;
-			auto term2 = ci * (ci_dot_u * dfi_inv_cs2 * dfi_inv_cs2);
-
-			auto force_projection = saw::math::dot(term1 + term2, force);
+		// TODO - Change to tuple later
+		auto parts = pg.template get<"particles">();
 
-			auto F_i = w * force_projection;
+		auto parts_size = parts.meta.at({0u});
+		auto pi = parts.at(index);
 
-			dfs.at({i}) = dfs.at({i})
-									+ frequency_
-										* (eq.at(i) - dfs.at({i}) )
-									+ F_i.at({})
-										* (saw::data<T>{1} - saw::data<T>{0.5f} * frequency_);
+		auto eo_aabb = particle_aabb<typename ParticleSchema::ValueType>::calculate(pg,{{0u}},vel_f.meta());
+		if(eo_aabb.is_error()){
+			return;
 		}
-	}
+		auto& aabb = eo_aabb.get_value();
 
+		iterator<Desc::D>::apply([&](const auto& index_f) -> void {
 
+		}, start, stop);
+	}
 };
 
 template<typename T, typename Descriptor, typename Encode>
-- 
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