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#pragma once
#include <forstio/error.hpp>
#include <forstio/codec/data.hpp>
#include "descriptor.hpp"
#include <fstream>
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){
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){
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<uint64_t Dim, typename... StructT, saw::string_literal... StructN>
struct lbm_vtk_writer<sch::Array<sch::Struct<sch::Member<StructT,StructN>...> , Dim>> {
template<uint64_t i, uint64_t Dep>
static saw::error_or<void> write_i_iterate_d(std::ostream& vtk_file, const saw::data<sch::Array<sch::Struct<sch::Member<StructT,StructN>...>,Dim>>& field, saw::data<sch::FixedArray<sch::UInt64,Dim>>& index){
constexpr auto Lit = saw::parameter_key_pack_type<i, StructN...>::literal;
using Type = typename saw::parameter_pack_type<i,StructT...>::type;
if constexpr (Dep == Dim){
return lbm_vtk_writer<Type>::apply(vtk_file, field.at(index).template get<Lit>());
} else {
// Dep < Dim // I hope
static_assert(Dep < Dim, "Don't fall into this case");
for(index.at({Dep}) = 0; index.at({Dep}) < field.get_dims().at({Dep}); ++index.at({Dep})){
auto eov = write_i_iterate_d<i,Dep+1>(vtk_file, field, index);
if(eov.is_error()){
return eov;
}
}
}
return saw::make_void();
}
template<uint64_t i>
static saw::error_or<void> write_i(std::ostream& vtk_file, const saw::data<sch::Array<sch::Struct<sch::Member<StructT,StructN>...>,Dim>>& field){
auto meta = field.get_dims();
saw::data<sch::FixedArray<sch::UInt64,Dim>> index;
for(saw::data<sch::UInt64> it{0}; it.get() < Dim; ++it){
index.at({0u}).set(0u);
}
// vtk_file write?
// Data header
{
auto eov = lbm_vtk_writer<typename saw::parameter_pack_type<i,StructT...>::type>::apply_header(vtk_file, saw::parameter_key_pack_type<i, StructN...>::literal.view());
if(eov.is_error()){
return eov;
}
}
return write_i_iterate_d<i,0u>(vtk_file, field, index);
}
template<uint64_t i>
static saw::error_or<void> iterate_i(std::ostream& vtk_file, const saw::data<sch::Array<sch::Struct<sch::Member<StructT,StructN>...>, Dim>>& field){
constexpr auto Lit = saw::parameter_key_pack_type<i, StructN...>::literal;
{
auto eov = write_i<i>(vtk_file, field);
if(eov.is_error()){
return eov;
}
}
if constexpr ( (i+1u) < sizeof...(StructT) ){
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::Array<sch::Struct<sch::Member<StructT,StructN>...>, Dim>>& 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 meta = field.get_dims();
saw::data<sch::UInt64> pd_size{1u};
// DIMENSIONS
{
vtk_file << "DIMENSIONS";
for(saw::data<sch::UInt64> i{0u}; i.get() < Dim; ++i){
pd_size = pd_size * meta.at(i);
vtk_file << " " << meta.at(i).get();
}
for(saw::data<sch::UInt64> i{Dim}; i.get() < 3u; ++i){
vtk_file << " 1";
}
vtk_file << "\n";
}
if constexpr (sizeof...(StructT) > 0u){
// POINT DATA
{
vtk_file << "POINT_DATA " << pd_size.get() <<"\n";
}
// HEADER TO BODY
{
vtk_file << "\n";
}
return iterate_i<0u>(vtk_file, field);
}
return saw::make_void();
}
};
}
template<typename Struct>
saw::error_or<void> write_vtk_file(const std::string_view file_name, const saw::data<Struct>& field){
std::string vtk_file_name{file_name};
std::ofstream vtk_file{vtk_file_name};
if(!vtk_file.is_open()){
return saw::make_error<saw::err::critical>("Could not open file.");
}
auto eov = impl::lbm_vtk_writer<Struct>::apply(vtk_file, field);
return eov;
/*
vtk_file <<"# vtk DataFile Version 3.0\n";
vtk_file <<"Velocity Cavity2D example\n";
vtk_file <<"ASCII\n";
vtk_file <<"DATASET STRUCTURED_POINTS\n";
vtk_file <<"DIMENSIONS "<< dim_x <<" "<<dim_y<<" 1\n";
vtk_file <<"SPACING 1.0 1.0 1.0\n";
vtk_file <<"ORIGIN 0.0 0.0 0.0\n";
vtk_file <<"POINT_DATA "<<(dim_x*dim_y)<<"\n";
vtk_file <<"VECTORS Velocity float\n";
*/
}
}
}
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