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#pragma once
#include <forstio/error.hpp>
#include <forstio/codec/data.hpp>
#include <forstio/codec/data_math.hpp>
#include "descriptor.hpp"
#include "flatten.hpp"
#include "chunk.hpp"
#include <fstream>
#include <filesystem>
namespace kel {
namespace lbm {
namespace impl {
template<typename CellFieldSchema>
struct lbm_vtk_writer {
};
template<typename T, uint64_t D>
struct lbm_vtk_writer<sch::Primitive<T,D>> {
static saw::error_or<void> apply_header(std::ostream& vtk_file, std::string_view name){
vtk_file<<"SCALARS "<<name<<" float\n";
vtk_file<<"LOOKUP_TABLE default\n";
return saw::make_void();
}
static saw::error_or<void> apply(std::ostream& vtk_file, const saw::data<sch::Primitive<T,D>>& field){
if constexpr (std::is_same_v<T,sch::UnsignedInteger> and D == 1u) {
vtk_file<<field.template cast_to<sch::UInt16>().get()<<"\n";
}else{
vtk_file<<field.get()<<"\n";
}
return saw::make_void();
}
};
template<typename T, uint64_t D>
struct lbm_vtk_writer<sch::FixedArray<T,D>> {
static saw::error_or<void> apply_header(std::ostream& vtk_file, std::string_view name){
vtk_file<<"VECTORS "<<name<<" float\n";
return saw::make_void();
}
static saw::error_or<void> apply(std::ostream& vtk_file, const saw::data<sch::FixedArray<T,D>>& field){
saw::data<sch::FixedArray<sch::UInt64,D>> index;
for(saw::data<sch::UInt64> it{0}; it.get() < D; ++it){
index.at({0u}).set(0u);
}
// vtk_file<<"VECTORS "<<name<<" float\n";
for(uint64_t i = 0u; i < D; ++i){
if(i > 0){
vtk_file<<" ";
}
vtk_file<<field.at({i}).get();
}
for(uint64_t i = D; i < 3; ++i){
vtk_file<<" 0";
}
vtk_file<<"\n";
return saw::make_void();
}
};
template<typename T, uint64_t Ghost, uint64_t... D>
struct lbm_vtk_writer<sch::Chunk<T,Ghost,D...>> {
template<uint64_t d>
static saw::error_or<void> apply_d(std::ostream& vtk_file, const saw::data<sch::Chunk<T,Ghost,D...>>& field, saw::data<sch::FixedArray<sch::UInt64,sizeof...(D)>>& index){
if constexpr ( d < sizeof...(D)){
for(index.at({d}) = 0u; index.at({d}) < field.get_dims().at({d}); ++index.at({d})){
auto eov = apply_d<d+1u>(vtk_file, field, index);
}
}else{
auto eov = lbm_vtk_writer<T>::apply(vtk_file, field.at(index));
if(eov.is_error()) return eov;
}
return saw::make_void();
}
static saw::error_or<void> apply(std::ostream& vtk_file, const saw::data<sch::Chunk<T,Ghost,D...>>& field, std::string_view name){
{
auto eov = lbm_vtk_writer<T>::apply_header(vtk_file,name);
if(eov.is_error()){
return eov;
}
}
saw::data<sch::FixedArray<sch::UInt64,sizeof...(D)>> index;
for(saw::data<sch::UInt64> it{0}; it.get() < sizeof...(D); ++it){
index.at({0u}).set(0u);
}
{
auto eov = apply_d<0u>(vtk_file, field, index);
if(eov.is_error()){
return eov;
}
}
return saw::make_void();
}
};
template<typename T, uint64_t D>
struct lbm_vtk_writer<sch::Vector<T,D>> {
static saw::error_or<void> apply_header(std::ostream& vtk_file, std::string_view name){
vtk_file<<"VECTORS "<<name<<" float\n";
return saw::make_void();
}
static saw::error_or<void> apply(std::ostream& vtk_file, const saw::data<sch::Vector<T,D>>& field){
static_assert(D > 0, "Non-dimensionality is bad for velocity.");
static_assert(D <= 3, "4th dimension as well. Mostly due to vtk.");
// vtk_file<<"VECTORS "<<name<<" float\n";
for(uint64_t i = 0u; i < D; ++i){
if(i > 0){
vtk_file<<" ";
}
vtk_file<<field.at({{i}}).get();
}
for(uint64_t i = D; i < 3; ++i){
vtk_file<<" 0";
}
vtk_file<<"\n";
return saw::make_void();
}
};
template<typename... MemberT, saw::string_literal... Keys, uint64_t... Ghost, uint64_t... Dims>
struct lbm_vtk_writer<sch::Struct<sch::Member<sch::Chunk<MemberT,Ghost,Dims...>,Keys>...>> final {
template<uint64_t i>
static saw::error_or<void> iterate_i(std::ostream& vtk_file,
const saw::data<sch::Struct<sch::Member<sch::Chunk<MemberT,Ghost,Dims...>,Keys>...>>& field){
if constexpr ( i < sizeof...(MemberT) ) {
using MT = typename saw::parameter_pack_type<i,sch::Member<sch::Chunk<MemberT,Ghost,Dims...>,Keys>...>::type;
{
auto eov = lbm_vtk_writer<typename MT::ValueType>::apply(vtk_file,field.template get<MT::KeyLiteral>(), MT::KeyLiteral.view());
if(eov.is_error()){
return eov;
}
}
return iterate_i<i+1u>(vtk_file, field);
}
return saw::make_void();
}
static saw::error_or<void> apply(std::ostream& vtk_file,
const saw::data<sch::Struct<sch::Member<sch::Chunk<MemberT,Ghost,Dims...>,Keys>...>>& field){
vtk_file
<<"# vtk DataFile Version 3.0\n"
<<"LBM File\n"
<<"ASCII\n"
<<"DATASET STRUCTURED_POINTS\n"
<<"SPACING 1.0 1.0 1.0\n"
<<"ORIGIN 0.0 0.0 0.0\n"
;
auto& field_0 = field.template get<saw::parameter_key_pack_type<0u,Keys...>::literal>();
auto meta = field_0.get_dims();
saw::data<sch::UInt64> pd_size{1u};
// DIMENSIONS
{
vtk_file << "DIMENSIONS";
pd_size.set(saw::ct_multiply<uint64_t,Dims...>::value);
static_assert(saw::ct_multiply<uint64_t,Dims...>::value > 0u, "Invalid Dim size resulting in length 0u");
for(saw::data<sch::UInt64> i{0u}; i.get() < sizeof...(Dims); ++i){
pd_size = pd_size * meta.at(i);
vtk_file << " " << meta.at(i).get();
}
for(saw::data<sch::UInt64> i{sizeof...(Dims)}; i.get() < 3u; ++i){
vtk_file << " 1";
}
vtk_file << "\n";
}
if constexpr (sizeof...(MemberT) > 0u){
// POINT DATA
{
vtk_file << "POINT_DATA " << pd_size.get() <<"\n";
}
// HEADER TO BODY
{
vtk_file << "\n";
}
}
return iterate_i<0u>(vtk_file, field);
}
};
}
template<typename Sch>
saw::error_or<void> write_vtk_file(const std::filesystem::path& file_name, const saw::data<Sch>& field){
std::ofstream vtk_file{file_name};
if( not vtk_file.is_open() ){
return saw::make_error<saw::err::critical>("Could not open file.");
}
auto eov = impl::lbm_vtk_writer<Sch>::apply(vtk_file, field);
return eov;
}
}
}
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