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Add basic controller input using the SDL2 GameController API

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This commit is contained in:
Nadia Holmquist Pedersen 2023-06-27 22:40:38 +02:00
parent bf85b405af
commit 71dddc0020
4 changed files with 102 additions and 6 deletions
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70
src/emulator.cpp
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@ -117,7 +117,75 @@ void Emulator::run() {
srv.releaseTouchScreen();
}
break;
case SDL_CONTROLLERDEVICEADDED:
if (gameController != nullptr) {
break;
}
gameController = SDL_GameControllerOpen(event.cdevice.which);
break;
case SDL_CONTROLLERDEVICEREMOVED:
if (event.cdevice.which == gameControllerID) {
SDL_GameControllerClose(gameController);
gameController = nullptr;
gameControllerID = 0;
}
case SDL_CONTROLLERBUTTONUP:
case SDL_CONTROLLERBUTTONDOWN: {
u32 key = 0;
switch (event.cbutton.button) {
case SDL_CONTROLLER_BUTTON_A: key = Keys::B; break;
case SDL_CONTROLLER_BUTTON_B: key = Keys::A; break;
case SDL_CONTROLLER_BUTTON_X: key = Keys::Y; break;
case SDL_CONTROLLER_BUTTON_Y: key = Keys::X; break;
case SDL_CONTROLLER_BUTTON_LEFTSHOULDER: key = Keys::L; break;
case SDL_CONTROLLER_BUTTON_RIGHTSHOULDER: key = Keys::R; break;
case SDL_CONTROLLER_BUTTON_DPAD_LEFT: key = Keys::Left; break;
case SDL_CONTROLLER_BUTTON_DPAD_RIGHT: key = Keys::Right; break;
case SDL_CONTROLLER_BUTTON_DPAD_UP: key = Keys::Up; break;
case SDL_CONTROLLER_BUTTON_DPAD_DOWN: key = Keys::Down; break;
case SDL_CONTROLLER_BUTTON_BACK: key = Keys::Select; break;
case SDL_CONTROLLER_BUTTON_START: key = Keys::Start; break;
}
if (key != 0) {
if (event.cbutton.state == SDL_PRESSED) {
srv.pressKey(key);
} else {
srv.releaseKey(key);
}
}
}
}
}
if (gameController != nullptr) {
const s16 stickX = SDL_GameControllerGetAxis(gameController, SDL_CONTROLLER_AXIS_LEFTX);
const s16 stickY = SDL_GameControllerGetAxis(gameController, SDL_CONTROLLER_AXIS_LEFTY);
const s16 deadzone = 3276;
const s16 maxValue = 0x9C;
const s16 div = 0x8000 / maxValue;
if (abs(stickX) < deadzone) {
// Avoid overriding the keyboard's circlepad input
if (abs(srv.getCirclepadX()) != maxValue) {
srv.setCirclepadX(0);
}
} else {
srv.setCirclepadX(stickX / div);
}
if (abs(stickY) < deadzone) {
if (abs(srv.getCirclepadY()) != maxValue) {
srv.setCirclepadY(0);
}
} else {
srv.setCirclepadY(-(stickY / div));
}
}
// Update inputs in the HID module
@ -191,4 +259,4 @@ bool Emulator::loadELF(std::ifstream& file) {
Helpers::panic("Misaligned ELF entrypoint. TODO: Check if ELFs can boot in thumb mode");
}
return true;
}
}