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Adjust SDL loop timing a bit #752

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merged 2 commits into from
Jan 13, 2023
Merged

Adjust SDL loop timing a bit #752

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15a5479
Adjust SDL loop timing a bit
Daft-Freak Feb 11, 2022
c97c518
Don't limit emscripten refresh rate
Daft-Freak Aug 17, 2022
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41 changes: 26 additions & 15 deletions 32blit-sdl/System.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -251,12 +251,12 @@ void System::run() {
}

int System::timer_thread() {
// Signal the system loop every 20 msec.
// Signal the system loop every 10 msec.
int dropped = 0;
SDL_Event event = {};
event.type = timer_event;

while (SDL_SemWaitTimeout(s_timer_stop, 20)) {
while (SDL_SemWaitTimeout(s_timer_stop, 10)) {
if (SDL_SemValue(s_loop_update)) {
dropped++;
if(dropped > 100) {
Expand Down Expand Up @@ -296,20 +296,31 @@ int System::update_thread() {
return 0;
}

void System::loop()
{
SDL_LockMutex(m_input);
blit::buttons = shadow_buttons;
blit::tilt.x = shadow_tilt[0];
blit::tilt.y = shadow_tilt[1];
blit::tilt.z = shadow_tilt[2];
blit::joystick.x = shadow_joystick[0];
blit::joystick.y = shadow_joystick[1];
SDL_UnlockMutex(m_input);
blit::tick(::now());
void System::loop() {
SDL_LockMutex(m_input);
blit::buttons = shadow_buttons;
blit::tilt.x = shadow_tilt[0];
blit::tilt.y = shadow_tilt[1];
blit::tilt.z = shadow_tilt[2];
blit::joystick.x = shadow_joystick[0];
blit::joystick.y = shadow_joystick[1];
SDL_UnlockMutex(m_input);

// only render at 50Hz (main loop runs at 100Hz)
// however, the emscripten loop (usually) runs at the display refresh rate
auto time_now = ::now();
#ifndef __EMSCRIPTEN__
if(time_now - last_render_time >= 20)
#endif
{
blit::render(time_now);
last_render_time = time_now;
}

blit::tick(::now());
blit_input->rumble_controllers(blit::vibration);
blit::render(::now());
blit_multiplayer->update();

blit_multiplayer->update();
}

Uint32 System::mode() {
Expand Down
2 changes: 2 additions & 0 deletions 32blit-sdl/System.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,8 @@ class System {

bool running = false;

Uint32 last_render_time = 0;

// shadow input
Uint32 shadow_buttons = 0;
float shadow_joystick[2] = {0, 0};
Expand Down