void IMainGame::run() {
if (!init()) return;
const float DESIRED_FPS = 60.0f; // FPS the game is designed to run at
const int MAX_PHYSICS_STEPS = 1; // Max number of physics steps per frame
const float MS_PER_SECOND = 1000; // Number of milliseconds in a second
const float DESIRED_FRAMETIME = MS_PER_SECOND / DESIRED_FPS; // The desired frame time per frame
const float MAX_DELTA_TIME = 3.0f; // Maximum size of deltaTime
FpsLimiter limiter;
limiter.setMaxFPS(DESIRED_FPS);
m_isRunning = true;
float previousTicks = SDL_GetTicks();
while (m_isRunning) {
limiter.begin();
// Calculate the frameTime in milliseconds
float newTicks = SDL_GetTicks();
float frameTime = newTicks - previousTicks;
previousTicks = newTicks; // Store newTicks in previousTicks so we can use it next frame
// Get the total delta time
float totalDeltaTime = frameTime / DESIRED_FRAMETIME;
inputManager.update();
int i = 0;
while (totalDeltaTime > 0.0f && i < MAX_PHYSICS_STEPS && m_isRunning) {
// The deltaTime should be the the smaller of the totalDeltaTime and MAX_DELTA_TIME
float deltaTime = std::min(totalDeltaTime, MAX_DELTA_TIME);
// Update all physics here and pass in deltaTime
update(deltaTime);
if (m_isRunning) {
draw();
m_fps = limiter.end();
m_window.swapBuffers();
}
// Since we just took a step that is length deltaTime, subtract from totalDeltaTime
totalDeltaTime -= deltaTime;
// Increment our frame counter so we can limit steps to MAX_PHYSICS_STEPS
i++;
}
}
}
void IMainGame::run() {
if (!init()) return;
FpsLimiter limiter;
limiter.setMaxFPS(60.0f);
// Game loop
m_isRunning = true;
while (m_isRunning) {
limiter.begin();
inputManager.update();
// Call the custom update and draw method
update();
if (m_isRunning) {
draw();
m_fps = limiter.end();
m_window.swapBuffer();
}
}
}