SDL2 gamepad input capture
Posted: Tue Nov 11, 2025 8:45 pm
Can someone tell me how i can capture the gamepad input using the SDL incorporated component in Ogre 14.4 ?
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Can someone tell me how i can capture the gamepad input using the SDL incorporated component in Ogre 14.4 ?
i have implemented in
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OgreBites::InputListenerthe
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axisMoved(evt)I do
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if (evt.type == OgreBites::CONTROLLERAXISMOTION)i capture the evt.value for the given evt.axis
But i have troubles when the gamepad is dragging or the gamepad has ended the move.
I loose the event when the gamepad is draging, and i never capture evt.value == 0.
any light here?
Try to poll it each frame instead of relying on callback events:
SDL_GameControllerGetAxis
https://wiki.libsdl.org/SDL2/SDL_GameControllerGetAxis
Now runs very smooth and very well, thanks.
The gamepad input capture works perfectly, but after a pair of minutes using it, the render stops and the program becomes bloqued.
i am doing:
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void CustomCameraMan::checkGamepadMotion()
{
if (this->gamepad == nullptr)
gamepad = SDL_GameControllerFromInstanceID(0);
const short leftAxisLx = SDL_GameControllerGetAxis(gamepad, SDL_CONTROLLER_AXIS_LEFTX);
const short leftAxisLy = SDL_GameControllerGetAxis(gamepad, SDL_CONTROLLER_AXIS_LEFTY);
const short leftAxisRx = SDL_GameControllerGetAxis(gamepad, SDL_CONTROLLER_AXIS_RIGHTX);
const short leftAxisRy = SDL_GameControllerGetAxis(gamepad, SDL_CONTROLLER_AXIS_RIGHTY);Is needed some call to SD2 poll evends or some resource dispose function?
I have no idea why that happens, but first try some things yourself before we can help more in detail.
ChatGPT is a good friend, and it has some ideas: https://chatgpt.com/share/691c91b6-e2a8 ... b4b718a619
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while (SDL_PollEvent(&e)){};seems to clean the queue and keep the render loop floid.
There are a lot more things you need to handle if you have not done that loop previously.
That should already have happened if you used ApplicationContextSDL::pollEvents:
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void ApplicationContextSDL::pollEvents()
{
if(mWindows.empty())
{
// SDL events not initialized
return;
}
SDL_Event event;
while (SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_QUIT:
mRoot->queueEndRendering();
break;
case SDL_WINDOWEVENT:
if(event.window.event != SDL_WINDOWEVENT_RESIZED)
continue;
for(WindowList::iterator it = mWindows.begin(); it != mWindows.end(); ++it)
{
if(event.window.windowID != SDL_GetWindowID(it->native))
continue;
Ogre::RenderWindow* win = it->render;
win->resize(event.window.data1, event.window.data2);
windowResized(win);
}
break;
case SDL_CONTROLLERDEVICEADDED:
if(auto c = SDL_GameControllerOpen(event.cdevice.which))
{
const char* name = SDL_GameControllerName(c);
Ogre::LogManager::getSingleton().stream() << "Opened Gamepad: " << (name ? name : "unnamed");
}
break;
default:
_fireInputEvent(convert(event), event.window.windowID);
break;
}
}
}