BlackMATov/ecs.hpp
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8d535bae3482565bfa8441d12e94322b35ca487a
ecs.hpp/ecs_tests.cpp
BlackMATov 817e130855 const_entity first impl
2018-12-29 04:07:30 +07:00

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/*******************************************************************************
* This file is part of the "https://github.com/blackmatov/ecs.hpp"
* For conditions of distribution and use, see copyright notice in LICENSE.md
* Copyright (C) 2018 Matvey Cherevko
******************************************************************************/
#define CATCH_CONFIG_FAST_COMPILE
#include "catch.hpp"
#include "ecs.hpp"
namespace ecs = ecs_hpp;
namespace
{
struct position_c {
int x{0};
int y{0};
position_c() = default;
position_c(int nx, int ny) : x(nx), y(ny) {}
};
struct velocity_c {
int x{0};
int y{0};
velocity_c() = default;
velocity_c(int nx, int ny) : x(nx), y(ny) {}
};
bool operator==(const position_c& l, const position_c& r) noexcept {
return l.x == r.x
&& l.y == r.y;
}
bool operator==(const velocity_c& l, const velocity_c& r) noexcept {
return l.x == r.x
&& l.y == r.y;
}
struct mult_indexer {
template < typename T >
std::size_t operator()(const T& v) const noexcept {
return static_cast<std::size_t>(v * 2);
}
};
struct position_c_indexer {
std::size_t operator()(const position_c& v) const noexcept {
return static_cast<std::size_t>(v.x);
}
};
}
TEST_CASE("detail") {
SECTION("get_type_id") {
using namespace ecs::detail;
REQUIRE(type_family<position_c>::id() == 1u);
REQUIRE(type_family<position_c>::id() == 1u);
REQUIRE(type_family<velocity_c>::id() == 2u);
REQUIRE(type_family<velocity_c>::id() == 2u);
REQUIRE(type_family<position_c>::id() == 1u);
REQUIRE(type_family<velocity_c>::id() == 2u);
}
SECTION("tuple_tail") {
using namespace ecs::detail;
{
REQUIRE(tuple_tail(std::make_tuple(1, 2, 3)) == std::make_tuple(2, 3));
REQUIRE(tuple_tail(std::make_tuple(2, 3)) == std::make_tuple(3));
REQUIRE(tuple_tail(std::make_tuple(3)) == std::make_tuple());
}
{
const auto t1 = std::make_tuple(1);
const auto t2 = std::make_tuple(1, 2);
const auto t3 = std::make_tuple(1, 2, 3);
REQUIRE(tuple_tail(t1) == std::make_tuple());
REQUIRE(tuple_tail(t2) == std::make_tuple(2));
REQUIRE(tuple_tail(t3) == std::make_tuple(2, 3));
}
}
SECTION("tuple_contains") {
using namespace ecs::detail;
{
REQUIRE_FALSE(tuple_contains(std::make_tuple(), nullptr));
REQUIRE_FALSE(tuple_contains(std::make_tuple(1), 0));
REQUIRE_FALSE(tuple_contains(std::make_tuple(1), 2));
REQUIRE(tuple_contains(std::make_tuple(1), 1));
REQUIRE(tuple_contains(std::make_tuple(1,2,3), 1));
REQUIRE(tuple_contains(std::make_tuple(1,2,3), 2));
REQUIRE(tuple_contains(std::make_tuple(1,2,3), 3));
REQUIRE_FALSE(tuple_contains(std::make_tuple(1,2,3), 0));
REQUIRE_FALSE(tuple_contains(std::make_tuple(1,2,3), 4));
}
}
SECTION("entity_id") {
using namespace ecs::detail;
{
REQUIRE(entity_id_index(entity_id_join(10u, 20u)) == 10u);
REQUIRE(entity_id_version(entity_id_join(10u, 20u)) == 20u);
REQUIRE(upgrade_entity_id(entity_id_join(10u, 20u)) == entity_id_join(10u, 21u));
REQUIRE(upgrade_entity_id(entity_id_join(0u, 1023u)) == entity_id_join(0u, 0u));
REQUIRE(upgrade_entity_id(entity_id_join(1u, 1023u)) == entity_id_join(1u, 0u));
REQUIRE(upgrade_entity_id(entity_id_join(2048u, 1023u)) == entity_id_join(2048u, 0u));
}
}
SECTION("sparse_set") {
using namespace ecs::detail;
{
sparse_set<unsigned, mult_indexer> s{mult_indexer{}};
REQUIRE(s.empty());
REQUIRE_FALSE(s.size());
REQUIRE_FALSE(s.has(42u));
REQUIRE(s.find(42u) == s.end());
REQUIRE_FALSE(s.find_dense_index(42u).second);
REQUIRE_THROWS(s.get_dense_index(42u));
REQUIRE(s.insert(42u));
REQUIRE_FALSE(s.empty());
REQUIRE(s.size() == 1u);
REQUIRE(s.has(42u));
REQUIRE_FALSE(s.has(84u));
REQUIRE(s.find(42u) == s.begin());
REQUIRE(s.find_dense_index(42u).second);
REQUIRE(s.find_dense_index(42u).first == 0u);
REQUIRE(s.get_dense_index(42u) == 0u);
s.clear();
REQUIRE(s.empty());
REQUIRE_FALSE(s.size());
REQUIRE_FALSE(s.has(42u));
REQUIRE(s.insert(84u));
REQUIRE_FALSE(s.insert(84u));
REQUIRE(s.has(84u));
REQUIRE_FALSE(s.unordered_erase(42u));
REQUIRE(s.unordered_erase(84u));
REQUIRE_FALSE(s.has(84u));
REQUIRE(s.empty());
REQUIRE_FALSE(s.size());
s.insert(42u);
s.insert(84u);
REQUIRE(s.has(42u));
REQUIRE(s.has(84u));
REQUIRE(s.size() == 2u);
REQUIRE(s.find_dense_index(42u).second);
REQUIRE(s.find_dense_index(42u).first == 0u);
REQUIRE(s.find_dense_index(84u).second);
REQUIRE(s.find_dense_index(84u).first == 1u);
REQUIRE(s.get_dense_index(42u) == 0u);
REQUIRE(s.get_dense_index(84u) == 1u);
REQUIRE(s.unordered_erase(42u));
REQUIRE_FALSE(s.has(42u));
REQUIRE(s.has(84u));
REQUIRE(s.size() == 1u);
REQUIRE(s.find_dense_index(84u).second);
REQUIRE(s.find_dense_index(84u).first == 0u);
REQUIRE_THROWS(s.get_dense_index(42u));
REQUIRE(s.get_dense_index(84u) == 0u);
}
{
sparse_set<position_c, position_c_indexer> s{position_c_indexer()};
REQUIRE(s.insert(position_c(1,2)));
REQUIRE_FALSE(s.insert(position_c(1,2)));
REQUIRE(s.has(position_c(1,2)));
REQUIRE(s.emplace(3,4));
REQUIRE(s.has(position_c(3,4)));
REQUIRE(s.get_dense_index(position_c(1,2)) == 0);
REQUIRE(s.get_dense_index(position_c(3,4)) == 1);
REQUIRE(s.find_dense_index(position_c(1,2)).first == 0);
REQUIRE(s.find_dense_index(position_c(3,4)).first == 1);
REQUIRE(s.find_dense_index(position_c(1,2)).second);
REQUIRE(s.find_dense_index(position_c(3,4)).second);
REQUIRE(s.unordered_erase(position_c(1,2)));
REQUIRE(s.get_dense_index(position_c(3,4)) == 0);
}
}
SECTION("sparse_map") {
using namespace ecs::detail;
{
struct obj_t {
int x;
obj_t(int nx) : x(nx) {}
};
sparse_map<unsigned, obj_t> m;
REQUIRE(m.empty());
REQUIRE_FALSE(m.size());
REQUIRE_FALSE(m.has(42u));
REQUIRE_THROWS(m.get(42u));
REQUIRE_THROWS(as_const(m).get(42u));
REQUIRE_FALSE(m.find(42u));
REQUIRE_FALSE(as_const(m).find(42u));
{
obj_t o{21u};
REQUIRE(m.insert(21u, o));
REQUIRE(m.insert(42u, obj_t{42u}));
REQUIRE(m.emplace(84u, 84u));
}
{
obj_t o{21u};
REQUIRE_FALSE(m.insert(21u, o));
REQUIRE_FALSE(m.insert(42u, obj_t{42u}));
REQUIRE_FALSE(m.emplace(84u, 84u));
}
REQUIRE_FALSE(m.empty());
REQUIRE(m.size() == 3u);
REQUIRE(m.has(21u));
REQUIRE(m.has(42u));
REQUIRE(m.has(84u));
REQUIRE_FALSE(m.has(11u));
REQUIRE_FALSE(m.has(25u));
REQUIRE_FALSE(m.has(99u));
REQUIRE(m.get(21u).x == 21u);
REQUIRE(m.get(42u).x == 42u);
REQUIRE(m.get(84u).x == 84u);
REQUIRE(as_const(m).get(84u).x == 84u);
REQUIRE_THROWS(m.get(11u));
REQUIRE_THROWS(m.get(25u));
REQUIRE_THROWS(m.get(99u));
REQUIRE_THROWS(as_const(m).get(99u));
REQUIRE(m.find(21u)->x == 21u);
REQUIRE(m.find(42u)->x == 42u);
REQUIRE(m.find(84u)->x == 84u);
REQUIRE(as_const(m).find(84u)->x == 84u);
REQUIRE_FALSE(m.find(11u));
REQUIRE_FALSE(m.find(25u));
REQUIRE_FALSE(m.find(99u));
REQUIRE_FALSE(as_const(m).find(99u));
REQUIRE(m.unordered_erase(42u));
REQUIRE_FALSE(m.unordered_erase(42u));
REQUIRE(m.has(21u));
REQUIRE_FALSE(m.has(42u));
REQUIRE(m.has(84u));
REQUIRE(m.size() == 2u);
m.clear();
REQUIRE(m.empty());
REQUIRE_FALSE(m.size());
REQUIRE_FALSE(m.has(21u));
REQUIRE_FALSE(m.has(42u));
REQUIRE_FALSE(m.has(84u));
}
{
struct obj_t {
int x;
obj_t(int nx) : x(nx) {}
};
sparse_map<position_c, obj_t, position_c_indexer> s{position_c_indexer()};
REQUIRE(s.insert(position_c(1,2), obj_t{1}));
REQUIRE_FALSE(s.insert(position_c(1,2), obj_t{1}));
REQUIRE(s.has(position_c(1,2)));
REQUIRE(s.emplace(position_c(3,4), obj_t{3}));
REQUIRE(s.has(position_c(3,4)));
REQUIRE(s.get(position_c(1,2)).x == 1);
REQUIRE(s.get(position_c(3,4)).x == 3);
REQUIRE(s.find(position_c(1,2))->x == 1);
REQUIRE(s.find(position_c(3,4))->x == 3);
REQUIRE(s.find(position_c(1,2)));
REQUIRE(s.find(position_c(3,4)));
REQUIRE(s.unordered_erase(position_c(1,2)));
REQUIRE(s.get(position_c(3,4)).x == 3);
}
}
}
TEST_CASE("registry") {
SECTION("entities") {
{
ecs::registry w;
ecs::entity e1{w};
ecs::entity e2{w};
REQUIRE(e1 == e2);
REQUIRE_FALSE(w.is_entity_alive(e1));
REQUIRE_FALSE(w.is_entity_alive(e2));
REQUIRE_FALSE(w.destroy_entity(e1));
REQUIRE_FALSE(w.destroy_entity(e2));
}
{
ecs::registry w;
auto e1 = w.create_entity();
auto e2 = w.create_entity();
REQUIRE(e1 != e2);
REQUIRE(w.is_entity_alive(e1));
REQUIRE(w.is_entity_alive(e2));
REQUIRE(w.destroy_entity(e1));
REQUIRE_FALSE(w.is_entity_alive(e1));
REQUIRE(w.is_entity_alive(e2));
REQUIRE(w.destroy_entity(e2));
REQUIRE_FALSE(w.is_entity_alive(e1));
REQUIRE_FALSE(w.is_entity_alive(e2));
REQUIRE_FALSE(w.destroy_entity(e1));
REQUIRE_FALSE(w.destroy_entity(e2));
}
{
ecs::registry w;
using namespace ecs::detail;
const auto e1 = w.create_entity();
w.destroy_entity(e1);
const auto e2 = w.create_entity();
REQUIRE(e1 != e2);
REQUIRE(entity_id_index(e1.id()) == entity_id_index(e2.id()));
REQUIRE(entity_id_version(e1.id()) + 1 == entity_id_version(e2.id()));
w.destroy_entity(e2);
const auto e3 = w.create_entity();
REQUIRE(e3 != e2);
REQUIRE(entity_id_index(e2.id()) == entity_id_index(e3.id()));
REQUIRE(entity_id_version(e2.id()) + 1 == entity_id_version(e3.id()));
}
{
ecs::registry w;
using namespace ecs::detail;
auto e = w.create_entity();
const auto e_id = e.id();
for ( std::size_t i = 0; i < entity_id_version_mask; ++i ) {
e.destroy();
e = w.create_entity();
REQUIRE(entity_id_version(e_id) != entity_id_version(e.id()));
}
// entity version wraps around
e.destroy();
e = w.create_entity();
REQUIRE(entity_id_version(e_id) == entity_id_version(e.id()));
}
{
ecs::registry w;
using namespace ecs::detail;
for ( std::size_t i = 0; i < entity_id_index_mask; ++i ) {
w.create_entity();
}
// entity index overflow
REQUIRE_THROWS_AS(w.create_entity(), std::logic_error);
}
}
SECTION("component_assigning") {
{
ecs::registry w;
ecs::entity e1 = w.create_entity();
{
REQUIRE_FALSE(w.exists_component<position_c>(e1));
REQUIRE_FALSE(w.exists_component<velocity_c>(e1));
REQUIRE(w.assign_component<position_c>(e1));
REQUIRE(w.exists_component<position_c>(e1));
REQUIRE_FALSE(w.exists_component<velocity_c>(e1));
REQUIRE(w.assign_component<velocity_c>(e1));
REQUIRE(w.exists_component<position_c>(e1));
REQUIRE(w.exists_component<velocity_c>(e1));
REQUIRE(w.remove_all_components(e1) == 2u);
REQUIRE_FALSE(w.exists_component<position_c>(e1));
REQUIRE_FALSE(w.exists_component<velocity_c>(e1));
}
{
REQUIRE_FALSE(e1.exists_component<position_c>());
REQUIRE_FALSE(e1.exists_component<velocity_c>());
REQUIRE(e1.assign_component<position_c>());
REQUIRE(e1.exists_component<position_c>());
REQUIRE_FALSE(e1.exists_component<velocity_c>());
REQUIRE(e1.assign_component<velocity_c>());
REQUIRE(e1.exists_component<position_c>());
REQUIRE(e1.exists_component<velocity_c>());
}
}
{
ecs::registry w;
auto e1 = w.create_entity();
auto e2 = w.create_entity();
REQUIRE(w.assign_component<position_c>(e1));
REQUIRE(w.assign_component<velocity_c>(e1));
REQUIRE(w.assign_component<position_c>(e2));
REQUIRE(w.assign_component<velocity_c>(e2));
REQUIRE(w.destroy_entity(e1));
REQUIRE_FALSE(w.exists_component<position_c>(e1));
REQUIRE_FALSE(w.exists_component<velocity_c>(e1));
REQUIRE(w.exists_component<position_c>(e2));
REQUIRE(w.exists_component<velocity_c>(e2));
}
{
ecs::registry w;
auto e1 = w.create_entity();
REQUIRE(e1.destroy());
REQUIRE_FALSE(e1.assign_component<position_c>());
REQUIRE_FALSE(w.exists_component<position_c>(e1));
}
}
SECTION("component_accessing") {
{
ecs::registry w;
auto e1 = w.create_entity();
auto e2 = w.create_entity();
REQUIRE_FALSE(e1.find_component<position_c>());
REQUIRE_FALSE(e2.find_component<velocity_c>());
e1.assign_component<position_c>(1, 2);
e2.assign_component<velocity_c>(3, 4);
REQUIRE(e1.get_component<position_c>().x == 1);
REQUIRE(e1.get_component<position_c>().y == 2);
REQUIRE(e2.get_component<velocity_c>().x == 3);
REQUIRE(e2.get_component<velocity_c>().y == 4);
REQUIRE_THROWS_AS(e1.get_component<velocity_c>(), std::logic_error);
REQUIRE_THROWS_AS(e2.get_component<position_c>(), std::logic_error);
}
{
ecs::registry w;
const auto e1 = w.create_entity();
const auto e2 = w.create_entity();
REQUIRE_FALSE(e1.find_component<position_c>());
REQUIRE_FALSE(e2.find_component<velocity_c>());
w.assign_component<position_c>(e1, 1, 2);
w.assign_component<velocity_c>(e2, 3, 4);
REQUIRE(e1.find_component<position_c>()->y == 2);
REQUIRE(e2.find_component<velocity_c>()->y == 4);
{
const ecs::registry& ww = w;
REQUIRE(ww.get_component<position_c>(e1).x == 1);
REQUIRE(ww.get_component<position_c>(e1).y == 2);
REQUIRE(ww.get_component<velocity_c>(e2).x == 3);
REQUIRE(ww.get_component<velocity_c>(e2).y == 4);
REQUIRE_THROWS_AS(ww.get_component<velocity_c>(e1), std::logic_error);
REQUIRE_THROWS_AS(ww.get_component<position_c>(e2), std::logic_error);
}
}
{
ecs::registry w;
auto e1 = w.create_entity();
e1.assign_component<position_c>(1, 2);
e1.assign_component<position_c>(3, 4);
REQUIRE(e1.get_component<position_c>().x == 3);
REQUIRE(e1.get_component<position_c>().y == 4);
}
{
ecs::registry w;
auto e1 = w.create_entity();
REQUIRE(e1.find_components<>() ==
std::make_tuple());
REQUIRE(e1.find_components<velocity_c>() ==
std::make_tuple<velocity_c*>(nullptr));
REQUIRE(e1.find_components<position_c, velocity_c>() ==
std::make_tuple<position_c*, velocity_c*>(nullptr, nullptr));
REQUIRE(e1.get_components<>() == std::make_tuple());
REQUIRE_THROWS(e1.get_components<velocity_c>());
REQUIRE_THROWS(e1.get_components<position_c, velocity_c>());
{
const auto ee1 = e1;
REQUIRE(ee1.find_components<>() ==
std::make_tuple());
REQUIRE(ee1.find_components<velocity_c>() ==
std::make_tuple<velocity_c*>(nullptr));
REQUIRE(ee1.find_components<position_c, velocity_c>() ==
std::make_tuple<position_c*, velocity_c*>(nullptr, nullptr));
REQUIRE(ee1.get_components<>() == std::make_tuple());
REQUIRE_THROWS(ee1.get_components<velocity_c>());
REQUIRE_THROWS(ee1.get_components<position_c, velocity_c>());
}
e1.assign_component<velocity_c>(3, 4);
REQUIRE(e1.find_components<velocity_c>() ==
std::make_tuple<velocity_c*>(e1.find_component<velocity_c>()));
REQUIRE(e1.find_components<position_c, velocity_c>() ==
std::make_tuple<position_c*, velocity_c*>(nullptr, e1.find_component<velocity_c>()));
REQUIRE(e1.get_components<velocity_c>() ==
std::make_tuple<velocity_c&>(e1.get_component<velocity_c>()));
REQUIRE_THROWS(e1.get_components<position_c, velocity_c>());
{
const auto ee1 = e1;
REQUIRE(ee1.find_components<velocity_c>() ==
std::make_tuple<velocity_c*>(e1.find_component<velocity_c>()));
REQUIRE(ee1.find_components<position_c, velocity_c>() ==
std::make_tuple<position_c*, velocity_c*>(nullptr, e1.find_component<velocity_c>()));
REQUIRE(ee1.get_components<velocity_c>() ==
std::make_tuple<const velocity_c&>(ee1.get_component<velocity_c>()));
REQUIRE_THROWS(ee1.get_components<position_c, velocity_c>());
}
e1.assign_component<position_c>(1, 2);
auto p = e1.get_components<position_c, velocity_c>();
std::get<0>(p).x = 10;
std::get<1>(p).x = 30;
REQUIRE(e1.get_component<position_c>().x == 10);
REQUIRE(e1.get_component<velocity_c>().x == 30);
auto p2 = e1.find_components<position_c, velocity_c>();
std::get<0>(p2)->y = 20;
std::get<1>(p2)->y = 40;
REQUIRE(e1.get_component<position_c>().y == 20);
REQUIRE(e1.get_component<velocity_c>().y == 40);
}
}
SECTION("for_each_entity") {
{
ecs::registry w;
auto e1 = w.create_entity();
auto e2 = w.create_entity();
{
ecs::entity_id acc1 = 0;
w.for_each_entity([&acc1](const ecs::entity& e){
acc1 += e.id();
});
REQUIRE(acc1 == e1.id() + e2.id());
}
{
const ecs::registry& ww = w;
ecs::entity_id acc1 = 0;
ww.for_each_entity([&acc1](const ecs::const_entity& e){
acc1 += e.id();
});
REQUIRE(acc1 == e1.id() + e2.id());
}
}
}
SECTION("for_each_component") {
{
ecs::registry w;
auto e1 = w.create_entity();
auto e2 = w.create_entity();
e1.assign_component<position_c>(1, 2);
e1.assign_component<velocity_c>(3, 4);
e2.assign_component<position_c>(5, 6);
e2.assign_component<velocity_c>(7, 8);
{
ecs::entity_id acc1 = 0;
int acc2 = 0;
w.for_each_component<position_c>([&acc1, &acc2](ecs::entity e, position_c& p){
acc1 += e.id();
acc2 += p.x;
});
REQUIRE(acc1 == e1.id() + e2.id());
REQUIRE(acc2 == 6);
}
{
const ecs::registry& ww = w;
ecs::entity_id acc1 = 0;
int acc2 = 0;
ww.for_each_component<position_c>([&acc1, &acc2](ecs::const_entity e, const position_c& p){
acc1 += e.id();
acc2 += p.x;
});
REQUIRE(acc1 == e1.id() + e2.id());
REQUIRE(acc2 == 6);
}
}
{
ecs::registry w;
{
auto e1 = w.create_entity();
auto e2 = w.create_entity();
e1.destroy();
e2.destroy();
}
auto e3 = w.create_entity();
auto e4 = w.create_entity();
e3.assign_component<position_c>(1, 2);
e4.assign_component<position_c>(3, 4);
{
ecs::entity_id acc1 = 0;
int acc2 = 0;
w.for_each_component<position_c>([&acc1, &acc2](ecs::entity e, position_c& p){
acc1 += e.id();
acc2 += p.x;
});
REQUIRE(acc1 == e3.id() + e4.id());
REQUIRE(acc2 == 4);
}
}
}
SECTION("for_joined_components") {
{
ecs::registry w;
auto e1 = w.create_entity();
auto e2 = w.create_entity();
auto e3 = w.create_entity();
auto e4 = w.create_entity();
w.create_entity();
e1.assign_component<position_c>(1, 2);
e1.assign_component<velocity_c>(3, 4);
e2.assign_component<position_c>(5, 6);
e2.assign_component<velocity_c>(7, 8);
e3.assign_component<position_c>(100, 500);
e4.assign_component<velocity_c>(500, 100);
{
ecs::entity_id acc1 = 0;
int acc2 = 0;
w.for_joined_components<position_c, velocity_c>([&acc1, &acc2](
ecs::entity e, const position_c& p, const velocity_c& v)
{
acc1 += e.id();
acc2 += p.x + v.x;
});
REQUIRE(acc1 == e1.id() + e2.id());
REQUIRE(acc2 == 16);
}
{
const ecs::registry& ww = w;
ecs::entity_id acc1 = 0;
int acc2 = 0;
ww.for_joined_components<position_c, velocity_c>([&acc1, &acc2](
ecs::const_entity e, const position_c& p, const velocity_c& v)
{
acc1 += e.id();
acc2 += p.x + v.x;
});
REQUIRE(acc1 == e1.id() + e2.id());
REQUIRE(acc2 == 16);
}
}
{
ecs::registry w;
auto e1 = w.create_entity();
e1.assign_component<position_c>(1, 2);
w.for_joined_components<position_c, velocity_c>([](
ecs::entity, const position_c&, const velocity_c&)
{
});
}
}
SECTION("systems") {
{
class movement_system : public ecs::system {
public:
void process(ecs::registry& owner) override {
owner.for_joined_components<position_c, velocity_c>([](
ecs::entity, position_c& p, const velocity_c& v)
{
p.x += v.x;
p.y += v.y;
});
}
};
ecs::registry w;
w.add_system<movement_system>();
auto e1 = w.create_entity();
auto e2 = w.create_entity();
e1.assign_component<position_c>(1, 2);
e1.assign_component<velocity_c>(3, 4);
e2.assign_component<position_c>(5, 6);
e2.assign_component<velocity_c>(7, 8);
w.process_systems();
REQUIRE(e1.get_component<position_c>().x == 1 + 3);
REQUIRE(e1.get_component<position_c>().y == 2 + 4);
REQUIRE(e2.get_component<position_c>().x == 5 + 7);
REQUIRE(e2.get_component<position_c>().y == 6 + 8);
}
}
}
TEST_CASE("example") {
struct position_component {
float x{0};
float y{0};
position_component(float nx, float ny)
: x(nx), y(ny) {}
};
struct velocity_component {
float dx{0};
float dy{0};
velocity_component(float ndx, float ndy)
: dx(ndx), dy(ndy) {}
};
class movement_system : public ecs_hpp::system {
public:
void process(ecs_hpp::registry& owner) override {
owner.for_joined_components<
position_component,
velocity_component
>([](const ecs_hpp::entity& e, position_component& p, const velocity_component& v) {
p.x += v.dx;
p.y += v.dy;
});
}
};
class gravity_system : public ecs_hpp::system {
public:
gravity_system(float gravity)
: gravity_(gravity) {}
void process(ecs_hpp::registry& owner) override {
owner.for_each_component<
velocity_component
>([this](const ecs_hpp::entity& e, velocity_component& v) {
v.dx += gravity_;
v.dy += gravity_;
});
}
private:
float gravity_;
};
ecs_hpp::registry world;
world.add_system<movement_system>();
world.add_system<gravity_system>(9.8f);
auto entity_one = world.create_entity();
world.assign_component<position_component>(entity_one, 4.f, 2.f);
world.assign_component<velocity_component>(entity_one, 10.f, 20.f);
auto entity_two = world.create_entity();
entity_two.assign_component<position_component>(4.f, 2.f);
entity_two.assign_component<velocity_component>(10.f, 20.f);
world.process_systems();
}
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