| 1 | #include <chrono> |
| 2 | #include <atomic> |
| 3 | #include <thread> |
| 4 |
|
| 5 | #include "ZydecoCommon.hpp" |
| 6 | #include "Engine.hpp" |
| 7 | #include "IEventHandler.hpp" |
| 8 | #include "IWindow.hpp" |
| 9 |
|
| 10 |
|
| 11 | Logger LOGGER("ENGINE"); |
| 12 | Logger RENDER_LOGGER("ENGINE::RENDER"); |
| 13 |
|
| 14 | Engine::Engine(IEventHandler& r_event_handler, IWindow& r_window): |
| 15 | m_rEventHandler(r_event_handler), |
| 16 | m_rWindow(r_window), |
| 17 | m_framerate(60), |
| 18 | m_frameRenderTimeUs(static_cast<int64_t>(1'000'000 / m_framerate)) |
| 19 | { |
| 20 | LOGGER.Log(Logger::INFO, "Initializing engine"); |
| 21 | LOGGER.Log(Logger::DEBUG, "Frame render time: {}us", m_frameRenderTimeUs.count()); |
| 22 |
|
| 23 | r_event_handler.RegisterQuitEventSubscriber(this); |
| 24 |
|
| 25 | std::atomic_init(&m_aIsExiting, false); |
| 26 | } |
| 27 |
|
| 28 | Engine::~Engine() |
| 29 | { |
| 30 | LOGGER.Log(Logger::DEBUG, "Destroy engine"); |
| 31 | } |
| 32 |
|
| 33 | void Engine::OnQuitEvent() |
| 34 | { |
| 35 | LOGGER.Log(Logger::DEBUG, "Received QuitEvent"); |
| 36 |
|
| 37 | m_aIsExiting.store(true); |
| 38 | } |
| 39 |
|
| 40 | void Engine::Start() |
| 41 | { |
| 42 | LOGGER.Log(Logger::INFO, "Entering engine loop (thread handler)"); |
| 43 |
|
| 44 | LOGGER.Log(Logger::DEBUG, "Starting event handler thread"); |
| 45 | std::thread event_thread(&Engine::DoEventLoop, this); |
| 46 | m_threads["Event Handler"] = &event_thread; |
| 47 |
|
| 48 | LOGGER.Log(Logger::DEBUG, "Starting render thread"); |
| 49 | std::thread render_thread(&Engine::DoRenderLoop, this); |
| 50 | m_threads["Renderer"] = &render_thread; |
| 51 |
|
| 52 | // std::thread(&Engine::DoEventLoop, this); |
| 53 | // std::thread(&Engine::DoGameLoop, this); |
| 54 |
|
| 55 | // Step clock while subsystems are running |
| 56 | while (m_aIsExiting.load() == false) |
| 57 | { |
| 58 | m_currentTime = std::chrono::time_point_cast<std::chrono::microseconds, std::chrono::steady_clock, std::chrono::nanoseconds>( |
| 59 | std::chrono::steady_clock::now() |
| 60 | ); |
| 61 | std::this_thread::sleep_for(std::chrono::microseconds(100)); |
| 62 | } |
| 63 |
|
| 64 | // Subsystem signaled exiting |
| 65 | LOGGER.Log(Logger::DEBUG, "Signal to quit"); |
| 66 |
|
| 67 | // Wait for program completion |
| 68 | for (auto active_thread : m_threads) |
| 69 | { |
| 70 | while (active_thread.second->joinable()) { |
| 71 | LOGGER.Log(Logger::DEBUG, "Exiting thread {}", active_thread.first); |
| 72 | active_thread.second->join(); |
| 73 | } |
| 74 | } |
| 75 |
|
| 76 | LOGGER.Log(Logger::INFO, "Exiting engine loop (thread handler)"); |
| 77 | } |
| 78 |
|
| 79 | void Engine::Kill() |
| 80 | { |
| 81 |
|
| 82 | } |
| 83 |
|
| 84 | void Engine::DoEventLoop() |
| 85 | { |
| 86 | m_rEventHandler.Update(0); |
| 87 |
|
| 88 | m_aIsExiting.store(true); |
| 89 | } |
| 90 |
|
| 91 | void Engine::DoRenderLoop() |
| 92 | { |
| 93 | RENDER_LOGGER.Log(Logger::DEBUG, "Starting render loop"); |
| 94 |
|
| 95 | std::chrono::time_point<std::chrono::steady_clock, std::chrono::microseconds> expected_end_time; |
| 96 | std::chrono::microseconds time_since_last_tick; |
| 97 | std::chrono::microseconds remaining_time_before_next_tick; |
| 98 |
|
| 99 | // Loop while not exiting |
| 100 | while (m_aIsExiting.load() == false) |
| 101 | { |
| 102 | // Calculate time since last tick, update tick start/end times |
| 103 | time_since_last_tick = std::chrono::duration_cast<std::chrono::microseconds>(m_currentTime - m_frameRenderStartTime); |
| 104 | m_frameRenderStartTime = m_currentTime; |
| 105 | expected_end_time = m_currentTime + m_frameRenderTimeUs; |
| 106 |
|
| 107 | // Update system with time since last tick |
| 108 | bool exiting = m_rWindow.Update(time_since_last_tick.count()); |
| 109 | if (exiting) { break; } |
| 110 |
|
| 111 | // Calculate remaining tick time; if >0, sleep until next tick |
| 112 | remaining_time_before_next_tick = expected_end_time - m_currentTime; |
| 113 | if (remaining_time_before_next_tick.count() > 0) |
| 114 | { |
| 115 | std::this_thread::sleep_until(expected_end_time); |
| 116 | } |
| 117 | else |
| 118 | { |
| 119 | int64_t tick_time = (m_currentTime - m_frameRenderStartTime).count(); |
| 120 | RENDER_LOGGER.Log(Logger::WARNING, "Overutilized! Tick time: {}us ({} ticks per second)", tick_time, 1'000'000./(float)tick_time); |
| 121 | } |
| 122 | } |
| 123 |
|
| 124 | RENDER_LOGGER.Log(Logger::INFO, "Exiting render loop"); |
| 125 | m_aIsExiting.store(true); |
| 126 | std::this_thread::yield(); |
| 127 | } |
| 128 |
|
| 129 | /* |
| 130 | class Engine |
| 131 | { |
| 132 | public: |
| 133 | Engine(); |
| 134 | ~Engine(); |
| 135 | |
| 136 | void Start(); |
| 137 | void Kill(); |
| 138 | |
| 139 | void Update(); |
| 140 | |
| 141 | protected: |
| 142 | Window m_sdlWindow; |
| 143 | Scene m_scene; |
| 144 | Renderer m_renderer; |
| 145 | EventHandler m_eventHandler; |
| 146 | }; |
| 147 | */ |
| 148 |
|
Index