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#include <kel/lbm/lbm.hpp>
#include <AdaptiveCpp/sycl/sycl.hpp>
#include <kel/lbm/particle/particle.hpp>
#include <iostream>
namespace kel{
namespace lbm {
namespace sch {
using namespace saw::schema;
}
}
saw::error_or<void> lbm_main(int argc, char** argv){
(void) argc;
(void) argv;
using namespace lbm;
using namespace acpp;
saw::data<sch::Array<sch::Particle<sch::Float32,2u>>> particles{1024u};
for(saw::data<sch::UInt64> i{0u}; i < saw::data<sch::UInt64>{32u}; ++i){
for(saw::data<sch::UInt64> j{0u}; j < saw::data<sch::UInt64>{32u}; ++j){
auto& part = particles.at(i*32ul+j);
auto& body = part.template get<"rigid_body">();
auto& pos = body.template get<"position">();
auto& old_pos = body.template get<"position_old">();
auto& acceleration = body.template get<"acceleration">();
auto& p_rad = part.template get<"collision">().template get<"radius">();
p_rad = {0.4f};
if(j.get() % 2u == 0) acceleration.at({{1u}}) = {-9.81};
pos.at({{0u}}) = {i.template cast_to<sch::Float32>()+0.5f};
pos.at({{1u}}) = {j.template cast_to<sch::Float32>()+64.0f};
old_pos = pos;
}
}
saw::data<sch::Scalar<sch::Float32>> time_step;
time_step.at({}).set(0.05f);
for(saw::data<sch::UInt64> dt{0u}; dt < saw::data<sch::UInt64>{32ul}; ++dt){
// Do Verlet Step
for(saw::data<sch::UInt64> i{0u}; i < particles.size(); ++i){
auto& part_i = particles.at(i);
verlet_step_lambda<sch::Float32,2u>(part_i,time_step);
auto& body_i = part_i.template get<"rigid_body">();
auto& acc_i = body_i.template get<"acceleration">();
acc_i.at({{0u}}) = 0.0;
acc_i.at({{1u}}) = -9.81;
}
//
for(saw::data<sch::UInt64> i{0u}; i < particles.size(); ++i){
auto& part_i = particles.at(i);
auto& body_i = part_i.template get<"rigid_body">();
auto& pos_i = body_i.template get<"position">();
auto& pos_old_i = body_i.template get<"position_old">();
/**
* Test against other particles
*/
for(saw::data<sch::UInt64> j{i+1ul}; j < particles.size(); ++j){
auto& part_j = particles.at(j);
auto& body_j = part_j.template get<"rigid_body">();
auto& pos_j = body_j.template get<"position">();
auto& pos_old_j = body_j.template get<"position_old">();
auto res = broadphase_collision_distance_squared<sch::Float32,2u>(part_i, part_j);
if(res.first){
//std::cout<<"Collision"<<std::endl;
// Do collision
auto vel_i = (pos_i - pos_old_i)/time_step;
auto vel_j = (pos_j - pos_old_j)/time_step;
auto vel_rel = vel_i - vel_j;
auto pos_rel = pos_i - pos_j;
auto vel_pos_rel_dot = saw::math::dot(vel_rel,pos_rel);
if(vel_pos_rel_dot.at({}).get() < 0.0){
auto pos_rel_normed = pos_rel / saw::math::sqrt(res.second);
}
// auto vel_ij = saw::math::dot(vel_i,vel_j);
}
}
/**
* Test against walls
*/
if(pos_i.at({{0u}}).get() <= 0 or pos_i.at({{0u}}).get() >= 40 ){
auto pos_i_0 = pos_i.at({{0u}});
pos_i.at({{0u}}) = pos_old_i.at({{0u}});
pos_old_i.at({{0u}}) = pos_i_0;
}
if(pos_i.at({{1u}}).get() <= 0 ){
auto pos_i_1 = pos_i.at({{1u}});
pos_i.at({{1u}}) = pos_old_i.at({{1u}});
pos_old_i.at({{1u}}) = pos_i_1;
}
}
auto& pos = particles.at({0u}).template get<"rigid_body">().template get<"position">();
std::cout<<pos.at({{0u}}).get()<<" "<<pos.at({{1u}}).get()<<std::endl;
}
return saw::make_void();
}
}
int main(int argc, char** argv){
auto eov = kel::lbm_main(argc, argv);
if(eov.is_error()){
auto& err = eov.get_error();
std::cerr<<"[Error] "<<err.get_category();
auto err_msg = err.get_message();
if(err_msg.size() > 0u){
std::cerr<<" - "<<err_msg;
}
std::cerr<<std::endl;
return err.get_id();
}
return 0;
}
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