From afc0998f10882af12c136cbffee85f40573f2b40 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Wed, 25 Mar 2026 13:40:32 +0100
Subject: Moving to finally implementing particles on gpu

---
 examples/settling_cubes_2d_ibm_gpu/sim.cpp | 27 ++++++++++-----------------
 1 file changed, 10 insertions(+), 17 deletions(-)

(limited to 'examples/settling_cubes_2d_ibm_gpu/sim.cpp')

diff --git a/examples/settling_cubes_2d_ibm_gpu/sim.cpp b/examples/settling_cubes_2d_ibm_gpu/sim.cpp
index 05a4a09..bb6ab59 100644
--- a/examples/settling_cubes_2d_ibm_gpu/sim.cpp
+++ b/examples/settling_cubes_2d_ibm_gpu/sim.cpp
@@ -53,13 +53,19 @@ using MacroStruct = Struct<
 //using ParticleArray = Array<
 //	Particle<T,Desc::D>
 //>;
+
+template<typename T, typename Desc>
+using ParticleGroups = Tuple<
+	ParticleGroup<
+		T,Desc::D
+	>
+>;
 }
 
 template<typename T, typename Desc>
 saw::error_or<void> setup_initial_conditions(
 		saw::data<sch::ChunkStruct<T,Desc>>& fields,
-		saw::data<sch::MacroStruct<T,Desc>>& macros,
-		saw::data<sch::FixedArray<sch::Particle<T,Desc::D>, particle_amount>>& particles
+		saw::data<sch::MacroStruct<T,Desc>>& macros
 ){
 	auto& info_f = fields.template get<"info">();
 	// Set everything as walls
@@ -111,7 +117,6 @@ template<typename T, typename Desc>
 saw::error_or<void> step(
 		saw::data<sch::Ptr<sch::ChunkStruct<T,Desc>>,encode::Sycl<saw::encode::Native>>& fields,
 		saw::data<sch::Ptr<sch::MacroStruct<T,Desc>>,encode::Sycl<saw::encode::Native>>& macros,
-		saw::data<sch::FixedArray<sch::Particle<T,Desc::D>, particle_amount>>& particles,
 		saw::data<sch::UInt64> t_i,
 		device& dev
 ){
@@ -119,10 +124,6 @@ saw::error_or<void> step(
 	auto& info_f = fields.template get<"info">();
 
 	{
-		auto& p = particles.at({{0u}});
-
-		auto& p_coll = p.template get<"collision">();
-		auto& p_rad = p_coll.template get<"radius">();
 	}
 
 
@@ -204,7 +205,6 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 	// saw::data<sch::FixedArray<sch::UInt64,Desc::D>> meta{{dim_x,dim_y}};
 	auto lbm_data_ptr = saw::heap<saw::data<sch::ChunkStruct<T,Desc>>>();
 	auto lbm_macro_data_ptr = saw::heap<saw::data<sch::MacroStruct<T,Desc>>>();
-	auto lbm_particle_data_ptr = saw::heap<saw::data<sch::FixedArray<sch::Particle<T,Desc::D>, particle_amount>>>();
 	
 	std::cout<<"Estimated Bytes: "<<memory_estimate<sch::ChunkStruct<T,Desc>,sch::MacroStruct<T,Desc>>().get()<<std::endl;
 
@@ -230,7 +230,7 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 
 	sycl_q.wait();
 	{
-		auto eov = setup_initial_conditions<T,Desc>(*lbm_data_ptr,*lbm_macro_data_ptr,*lbm_particle_data_ptr);
+		auto eov = setup_initial_conditions<T,Desc>(*lbm_data_ptr,*lbm_macro_data_ptr);
 		if(eov.is_error()){
 			return eov;
 		}
@@ -244,7 +244,6 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 
 	saw::data<sch::ChunkStruct<T,Desc>, encode::Sycl<saw::encode::Native>> lbm_sycl_data{sycl_q};
 	saw::data<sch::MacroStruct<T,Desc>, encode::Sycl<saw::encode::Native>> lbm_sycl_macro_data{sycl_q};
-	saw::data<sch::FixedArray<sch::Particle<T,Desc::D>, particle_amount>, encode::Sycl<saw::encode::Native>> lbm_sycl_particle_data{sycl_q};
 	sycl_q.wait();
 
 	auto lsd_view = make_chunk_struct_view(lbm_sycl_data);
@@ -261,12 +260,6 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 			return eov;
 		}
 	}
-	{
-		auto eov = dev.copy_to_device(*lbm_particle_data_ptr,lbm_sycl_particle_data);
-		if(eov.is_error()){
-			return eov;
-		}
-	}
 	sycl_q.wait();
 	saw::data<sch::UInt64> time_steps{16u*4096ul};
 
@@ -275,7 +268,7 @@ saw::error_or<void> lbm_main(int argc, char** argv){
 	for(saw::data<sch::UInt64> i{0u}; i < time_steps and krun; ++i){
 		// BC + Collision
 		{
-			auto eov = step<T,Desc>(lsd_view,lsdm_view,*lbm_particle_data_ptr,i,dev);
+			auto eov = step<T,Desc>(lsd_view,lsdm_view,i,dev);
 			if(eov.is_error()){
 				return eov;
 			}
-- 
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