mirror of
https://github.com/bailwillharr/engine.git
synced 2024-09-21 13:01:19 +00:00
114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
#include "application.hpp"
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#include "log.hpp"
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#include "window.hpp"
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#include "gfx_device.hpp"
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#include "input_manager.hpp"
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#include "scene_manager.hpp"
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#include "scene.hpp"
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// To allow the FPS-limiter to put the thread to sleep
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#include <thread>
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#ifdef _MSC_VER
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#include <windows.h>
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#include <direct.h>
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#define MAX_PATH 260
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#endif
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static std::filesystem::path getResourcesPath()
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{
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std::filesystem::path resourcesPath{};
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#ifdef _MSC_VER
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CHAR exeDirBuf[MAX_PATH + 1];
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GetModuleFileNameA(NULL, exeDirBuf, MAX_PATH + 1);
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std::filesystem::path cwd = std::filesystem::path(exeDirBuf).parent_path();
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(void)_chdir((const char*)std::filesystem::absolute(cwd).c_str());
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#else
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std::filesystem::path cwd = std::filesystem::current_path();
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#endif
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if (std::filesystem::is_directory(cwd / "res")) {
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resourcesPath = cwd / "res";
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}
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else {
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resourcesPath = cwd.parent_path() / "share" / "sdltest";
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}
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if (std::filesystem::is_directory(resourcesPath) == false) {
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resourcesPath = cwd.root_path() / "usr" / "local" / "share" / "sdltest";
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}
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if (std::filesystem::is_directory(resourcesPath) == false) {
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throw std::runtime_error("Unable to determine resources location. CWD: " + cwd.string());
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}
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return resourcesPath;
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}
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namespace engine {
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Application::Application(const char* appName, const char* appVersion)
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{
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m_window = std::make_unique<Window>(appName, true, false);
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m_gfx = std::make_unique<GFXDevice>(appName, appVersion, m_window->getHandle());
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m_inputManager = std::make_unique<InputManager>(window());
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m_sceneManager = std::make_unique<SceneManager>(this);
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// get base path for resources
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m_resourcesPath = getResourcesPath();
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}
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Application::~Application() {}
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void Application::gameLoop()
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{
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TRACE("Begin game loop...");
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constexpr int FPS_LIMIT = 240;
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constexpr auto FRAMETIME_LIMIT = std::chrono::nanoseconds(1000000000 / FPS_LIMIT);
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auto beginFrame = std::chrono::steady_clock::now();
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auto endFrame = beginFrame + FRAMETIME_LIMIT;
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auto lastTick = m_window->getNanos();
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// single-threaded game loop
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while (m_window->isRunning()) {
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/* logic */
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m_sceneManager->updateActiveScene(m_window->dt());
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if(m_window->getKeyPress(inputs::Key::K_L)) {
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// m_enableFrameLimiter = !m_enableFrameLimiter;
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m_window->infoBox("fps", std::to_string(m_window->getFPS()) + " fps " + std::to_string(m_window->dt() * 1000.0f) + " ms");
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}
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/* draw */
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m_gfx->renderFrame();
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/* poll events */
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m_window->getInputAndEvents();
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/* fps limiter */
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uint64_t now = m_window->getNanos();
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if (now - lastTick >= 1000000000LL * 10LL) {
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lastTick = now;
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m_window->setTitle(std::to_string(m_window->getAvgFPS()));
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m_window->resetAvgFPS();
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}
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if (m_enableFrameLimiter) {
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std::this_thread::sleep_until(endFrame);
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}
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beginFrame = endFrame;
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endFrame = beginFrame + FRAMETIME_LIMIT;
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}
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m_gfx->waitIdle();
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}
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}
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