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added fps; added time measurement of run loop; extra sleep commented out because of buggy update behaviour when used

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This commit is contained in:
Bob Polis 2020-11-11 17:37:23 +01:00
parent 97c837f9e9
commit 6202c7dba7
2 changed files with 25 additions and 0 deletions
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21
src/Application.cpp
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@ -17,6 +17,10 @@ Application Application::app;
void Application::run() {
bool quit {false};
while (!quit) {
// measure start time for this tick
auto start = SDL_GetTicks();
// handle events
SDL_Event event;
if (SDL_PollEvent(&event)) {
switch (event.type) {
@ -30,12 +34,29 @@ void Application::run() {
quit = handle_event(event);
}
}
// update windows
for (const Window& window : Window::windows()) {
window.update();
}
// run any custom actions
for (RunLoopAction action : _actions) {
action();
}
// measure end time for this tick
auto end = SDL_GetTicks();
// calculate how long this tick took, and how much is left
// if we want to maintain a steady fps
auto elapsed = end - start;
auto available = 1000 / _fps - elapsed;
// if there's any time left, sleep that much
if (available > 0) {
// SDL_Delay(available);
}
}
}

4
src/Application.hpp
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@ -36,11 +36,15 @@ namespace sc {
void add_run_loop_action(RunLoopAction action);
void remove_run_loop_action(RunLoopAction action);
int fps() const { return _fps; }
void fps(int fps) { _fps = fps; }
private:
static Application app;
std::map<SDL_EventType, std::vector<EventHandler>> _event_handlers;
std::vector<RunLoopAction> _actions;
int _fps {60};
bool handle_event(const SDL_Event& event);
};