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Properly link flecs library

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This commit is contained in:
Klemen Plestenjak
2023-11-09 11:38:29 +01:00
parent dc585396c3
commit 8edcf9305c
1392 changed files with 390081 additions and 164 deletions
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5
engine/libs/flecs/examples/cpp/queries/change_tracking/.gitignore vendored Normal file
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.bake_cache
.DS_Store
.vscode
gcov
bin

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engine/libs/flecs/examples/cpp/queries/change_tracking/include/change_tracking.h Normal file
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#ifndef CHANGE_TRACKING_H
#define CHANGE_TRACKING_H
/* This generated file contains includes for project dependencies */
#include "change_tracking/bake_config.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
}
#endif
#endif

24
engine/libs/flecs/examples/cpp/queries/change_tracking/include/change_tracking/bake_config.h Normal file
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/*
)
(.)
.|.
| |
_.--| |--._
.-'; ;`-'& ; `&.
\ & ; & &_/
|"""---...---"""|
\ | | | | | | | /
`---.|.|.|.---'
* This file is generated by bake.lang.c for your convenience. Headers of
* dependencies will automatically show up in this file. Include bake_config.h
* in your main project file. Do not edit! */
#ifndef CHANGE_TRACKING_BAKE_CONFIG_H
#define CHANGE_TRACKING_BAKE_CONFIG_H
/* Headers of public dependencies */
#include <flecs.h>
#endif

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engine/libs/flecs/examples/cpp/queries/change_tracking/project.json Normal file
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{
"id": "change_tracking",
"type": "application",
"value": {
"use": [
"flecs"
],
"language": "c++"
}
}

119
engine/libs/flecs/examples/cpp/queries/change_tracking/src/main.cpp Normal file
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#include <change_tracking.h>
#include <iostream>
// Queries have a builtin mechanism for tracking changes per matched table. This
// is a cheap way of eliminating redundant work, as many entities can be skipped
// with a single check.
//
// This example shows how to use change tracking in combination with a few other
// techniques, like using prefabs to store a single dirty state for multiple
// entities and instanced queries.
struct Dirty {
bool value;
};
struct Position {
double x, y;
};
int main(int, char *[]) {
flecs::world ecs;
// Create a query that just reads a component. We'll use this query for
// change tracking. Change tracking for a query is automatically enabled
// when query::changed() is called.
// Each query has its own private dirty state which is reset only when the
// query is iterated.
flecs::query<const Position> q_read = ecs.query<const Position>();
// Create a query that writes the component based on a Dirty state.
flecs::query<const Dirty, Position> q_write =
ecs.query_builder<const Dirty, Position>()
.term_at(1).up() // Only match Dirty from prefab
.instanced() // Instanced iteration is faster (see example)
.build();
// Create two prefabs with a Dirty component. We can use this to share a
// single Dirty value for all entities in a table.
flecs::entity p1 = ecs.prefab("p1").set<Dirty>({false});
flecs::entity p2 = ecs.prefab("p2").set<Dirty>({true});
// Create instances of p1 and p2. Because the entities have different
// prefabs, they end up in different tables.
ecs.entity("e1").is_a(p1)
.set<Position>({10, 20});
ecs.entity("e2").is_a(p1)
.set<Position>({30, 40});
ecs.entity("e3").is_a(p2)
.set<Position>({40, 50});
ecs.entity("e4").is_a(p2)
.set<Position>({60, 70});
// We can use the changed() function on the query to check if any of the
// tables it is matched with has changed. Since this is the first time that
// we check this and the query is matched with the tables we just created,
// the function will return true.
std::cout << "q_read.changed(): " << q_read.changed() << "\n";
// The changed state will remain true until we have iterated each table.
q_read.iter([](flecs::iter& it) {
// With the it.changed() function we can check if the table we're
// currently iterating has changed since last iteration.
// Because this is the first time the query is iterated, all tables
// will show up as changed.
std::cout << "it.changed() for table [" << it.type().str() << "]: "
<< it.changed() << "\n";
});
// Now that we have iterated all tables, the dirty state is reset.
std::cout << "q_read.changed(): " << q_read.changed() << "\n\n";
// Iterate the write query. Because the Position term is InOut (default)
// iterating the query will write to the dirty state of iterated tables.
q_write.iter([](flecs::iter& it, const Dirty *dirty, Position *p) {
std::cout << "iterate table [" << it.type().str() << "]\n";
// Because we enforced that Dirty is a shared component, we can check
// a single value for the entire table.
if (!dirty->value) {
// If the dirty flag is false, skip the table. This way the table's
// dirty state is not updated by the query.
it.skip();
std::cout << "it.skip() for table [" << it.type().str() << "]\n";
return;
}
// For all other tables the dirty state will be set.
for (auto i : it) {
p[i].x ++;
p[i].y ++;
}
});
// One of the tables has changed, so q_read.changed() will return true
std::cout << "\nq_read.changed(): " << q_read.changed() << "\n";
// When we iterate the read query, we'll see that one table has changed.
q_read.iter([](flecs::iter& it) {
std::cout << "it.changed() for table [" << it.type().str() << "]: "
<< it.changed() << "\n";
});
// Output:
// q_read.changed(): 1
// it.changed() for table [Position, (Identifier,Name), (IsA,p1)]: 1
// it.changed() for table [Position, (Identifier,Name), (IsA,p2)]: 1
// q_read.changed(): 0
//
// iterate table [Position, (Identifier,Name), (IsA,p1)]
// it.skip() for table [Position, (Identifier,Name), (IsA,p1)]
// iterate table [Position, (Identifier,Name), (IsA,p2)]
//
// q_read.changed(): 1
// it.changed() for table [Position, (Identifier,Name), (IsA,p1)]: 0
// it.changed() for table [Position, (Identifier,Name), (IsA,p2)]: 1
}