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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| #pragma once | ||
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| #include <entt/entt.hpp> | ||
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| #include <cstdint> | ||
| #include <iostream> | ||
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| #include "utility_profiling.h" | ||
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| namespace entt_test01 { | ||
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| struct Position { | ||
| float x; | ||
| float y; | ||
| }; | ||
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| struct Velocity { | ||
| float dx; | ||
| float dy; | ||
| }; | ||
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| void update(entt::DefaultRegistry ®istry) { | ||
| auto view = registry.view<Position, Velocity>(); | ||
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| for (auto entity : view) { | ||
| // gets only the components that are going to be used ... | ||
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| auto &velocity = view.get<Velocity>(entity); | ||
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| velocity.dx = 0.; | ||
| velocity.dy = 0.; | ||
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| // ... | ||
| } | ||
| } | ||
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| void update(std::uint64_t dt, entt::DefaultRegistry ®istry) { | ||
| registry.view<Position, Velocity>().each([dt](auto entity, auto &position, auto &velocity) { | ||
| // gets all the components of the view at once ... | ||
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| position.x += velocity.dx * dt; | ||
| position.y += velocity.dy * dt; | ||
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| // ... | ||
| }); | ||
| } | ||
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| int test() { | ||
| entt::DefaultRegistry registry; | ||
| std::uint64_t dt = 16; | ||
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| { | ||
| SCOPETIMER(); | ||
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| auto num = 1000000; | ||
| printf("Creating %i entities...", num); | ||
| for (auto i = 0; i < num; ++i) { | ||
| auto entity = registry.create(); | ||
| registry.assign<Position>(entity, i * 1.f, i * 1.f); | ||
| if (i % 2 == 0) { | ||
| registry.assign<Velocity>(entity, i * .1f, i * .1f); | ||
| } | ||
| } | ||
| printf("done!\n"); | ||
| // takes about 90ms in Release build | ||
| } | ||
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| { | ||
| SCOPETIMERAVG(1000); | ||
| for (auto i = 0; i < 1000; i++) | ||
| { | ||
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| update(dt, registry); | ||
| } | ||
| //takes about 3ms to update all entities | ||
| } | ||
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| update(registry); | ||
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| return 0; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| #include <iostream> | ||
| #include <entt\entt.hpp> | ||
| #include <cstdint> | ||
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| #include "entt_test01.h" | ||
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| void main() | ||
| { | ||
| entt_test01::test(); | ||
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| printf("hello world!"); | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| #pragma once | ||
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| #include <string> | ||
| #include <chrono> | ||
| #include <iostream> | ||
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| namespace util { | ||
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| class ScopeTimer { | ||
| public: | ||
| ScopeTimer(std::string text = "", unsigned int line = 0, unsigned int iterations = 0) :text(text), line(line), iterations(iterations) | ||
| { | ||
| start = std::chrono::high_resolution_clock::now(); | ||
| } | ||
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| ~ScopeTimer() | ||
| { | ||
| auto end = std::chrono::high_resolution_clock::now(); | ||
| auto dur = std::chrono::duration_cast<std::chrono::milliseconds>(end - start); | ||
| long long int ms = static_cast<long long int>(dur.count()); | ||
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| if (iterations > 2) ms /= iterations; | ||
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| if (text.length() > 0) printf("%s ", text); | ||
| if (line > 0) printf("(Line %u) ", line); | ||
| if (iterations > 2) printf("(avg. %u) ", iterations); | ||
| if (text.length() > 0 || line > 0 || iterations > 2) printf(": "); | ||
| printf("%lldms", ms); | ||
| printf("\n"); | ||
| } | ||
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| protected: | ||
| unsigned int iterations; | ||
| std::string text; | ||
| unsigned int line; | ||
| std::chrono::time_point<std::chrono::high_resolution_clock> start; | ||
| }; | ||
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| #define SCOPETIMER() util::ScopeTimer t(__FUNCTION__, __LINE__, 0) | ||
| #define SCOPETIMERAVG(iterations) util::ScopeTimer t(__FUNCTION__, __LINE__,iterations) | ||
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| } | ||
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